U.S. patent application number 12/668010 was filed with the patent office on 2010-07-22 for method of packing fiber for artificial hair.
This patent application is currently assigned to DENKI KAGAKU KOGYO KABUSHIKI KAISHA. Invention is credited to Hiroaki Hanzawa, Yukihisa Hoshino, Tomohiro Kimura, Akira Moroi, Takatoshi Suzuki.
Application Number | 20100180905 12/668010 |
Document ID | / |
Family ID | 40259504 |
Filed Date | 2010-07-22 |
United States Patent
Application |
20100180905 |
Kind Code |
A1 |
Kimura; Tomohiro ; et
al. |
July 22, 2010 |
METHOD OF PACKING FIBER FOR ARTIFICIAL HAIR
Abstract
[Problems] To provide a method of packing fiber for artificial
hair, while suppressing generation of folding mark during
packaging, transportation and storage and yet preserving preferable
processability and hairdressing characteristics. [Means for Solving
Problems] There is provided a method of packing fiber for
artificial hair, characterized by packing the artificial hair
fibers in a packaging container at a filling density of no lesser
than 0.1 kg/l and no more than 0.8 kg/l. Further in the packing
method, the pressure of the packed artificial hair fibers applied
to the top face of the packaging container is adjusted to no lesser
than 0.1 kPa and no more than 8.0 kPa.
Inventors: |
Kimura; Tomohiro; (Kanagawa,
JP) ; Hoshino; Yukihisa; (Kanagawa, JP) ;
Hanzawa; Hiroaki; (Kanagawa, JP) ; Moroi; Akira;
(Kanagawa, JP) ; Suzuki; Takatoshi; (Kanagawa,
JP) |
Correspondence
Address: |
ROBERTS MLOTKOWSKI SAFRAN & COLE, P.C.;Intellectual Property Department
P.O. Box 10064
MCLEAN
VA
22102-8064
US
|
Assignee: |
DENKI KAGAKU KOGYO KABUSHIKI
KAISHA
Tokyo
JP
|
Family ID: |
40259504 |
Appl. No.: |
12/668010 |
Filed: |
April 24, 2008 |
PCT Filed: |
April 24, 2008 |
PCT NO: |
PCT/JP2008/057960 |
371 Date: |
January 6, 2010 |
Current U.S.
Class: |
132/53 ; 206/525;
53/473 |
Current CPC
Class: |
B65B 63/02 20130101 |
Class at
Publication: |
132/53 ; 53/473;
206/525 |
International
Class: |
A41G 5/00 20060101
A41G005/00; B65B 3/04 20060101 B65B003/04; B65D 85/00 20060101
B65D085/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 13, 2007 |
JP |
2007-183995 |
Claims
1. A method of packing fiber for artificial hair, characterized by
packing artificial hair fibers in a packaging container at a
filling density of no less than 0.1 kg/l and no more than 0.8
kg/l.
2. The method of packing fiber for artificial hair according to
claim 1, wherein the pressure of the packed artificial hair fibers
applied to the top face of the packaging container is no less than
0.1 kPa and no more than 8.0 kPa.
3. The method of packing fiber for artificial hair according to
claim 1, wherein the value obtained by dividing the area of the
bottom face (S) of the packaging container by the height (H) of the
packaging container (S/H) is no less than 30 and no more than
300.
4. An artificial hair fiber, obtained by the method of packing
fiber for artificial hair according to claim 1.
5. A hair accessory, prepared by using the artificial hair fibers
obtained by the method of packing fiber for artificial hair
according to claim 1.
6. A package of packed artificial hair fibers, characterized in
that the artificial hair fibers is packed in a packaging container
at a filling density of no less than 0.1 kg/l and no more than 0.8
kg/l.
Description
TECHNICAL FIELD
[0001] The present invention relates to a method of packing fiber
for artificial hair, a package thus prepared, and others.
BACKGROUND ART
[0002] Various modifications of artificial hair fiber for example
in cross section, fineness, raw materials, and others have been
studied, for providing artificial hair products, such as wigs,
hairpieces, braids, extensions and weavings, with human natural
hair-like texture and excellent beauty characteristics.
[0003] For example, Patent Literature 1 discloses an
irregular-cross section fiber in a shape having a cross section of
two or more circles or ellipses partially superimposed or in
contact with each other, and having at least one protuberance
and/or dent on the peripheral of the circles or ellipses, for the
purpose of providing a favorably less glossy and favorably bulky
human hair-like fiber.
[0004] Alternatively Patent Literature 2 discloses artificial hair
fibers of a mixture of an acrylic fiber of a particular composition
having a monofilament fineness of 30 to 85 dtex and a vinyl
chloride-based fiber having a monofilament fineness of 30 to 85
dtex, for the purpose of providing artificial hair fibers
applicable to a variety of styles when used as artificial
hairs.
[0005] Patent Literature 3 discloses artificial hair fibers bundle
of a mixture of hollow and non-hollow fibers of a vinyl chloride
resin, for the purpose of providing artificial hair fibers bundle
well-balanced in bulkiness and softness.
[0006] Patent Literature 1: JPH10-168647A
[0007] Patent Literature 2: JP2002-227020A
[0008] Patent Literature 3: JP2007-9336A
SUMMARY OF INVENTION
Technical Problem
[0009] Artificial hair fibers have generally been packaged, as they
are packed in a box as fiber bundles (tows). However, the present
inventors recently recognized that the fiber bundles packed by such
a packing method occasionally have folding mark after
transportation and storage of the artificial hair fibers, and that
such fiber folding can cause significant problems in processability
of the artificial hair fibers and also in beauty characteristic of
the artificial hair products obtained.
[0010] Accordingly, the inventors have conducted an intensive study
to prevent such folding mark. The inventors have found in the study
that it was difficult to prevent the folding mark completely only
by modification of the cross section, fineness and raw materials of
the fiber as described above, and started a study to solve the
problems above by developing a new method of packing the artificial
hair fibers.
[0011] The main object of the present invention, which was made on
the basis of the studies, is to provide a method of packing fiber
for artificial hair, while suppressing generation of folding mark
during packaging, transportation, and storage and yet preserving
favorable processability and beauty characteristics.
Solution to Problem
[0012] The present invention, which was made to solve the problems
above, provides a method of packing artificial hair fibers,
characterized by packing artificial hair fibers in a packaging
container at a filling density of no lesser than 0.1 kg/l and no
more than 0.8 kg/l.
[0013] In the packing method, the pressure of the packed artificial
hair fibers applied to the top face of the packaging container is
preferably no lesser than 0.1 kPa and no more than 8.0 kPa.
[0014] In addition, the container used during packing has a value
obtained by dividing the area of the bottom face (S) by the height
(H) ("S/H") at no lesser than 30 and no more than 300.
[0015] The present invention also provides artificial hair fibers
obtained by the packing method, a hair accessory prepared by using
the same, and a package of the artificial hair fibers.
[0016] In the present invention, the pressure of the packed
artificial hair fibers applied to the top face of the packaging
container is determined in the following manner:
(1) The volume (V), the area of the top face (T) and the empty
weight (a) of the packaging container are determined. (2) The
container main body is sealed with a cover while particular sites
of the cover are held during measurement of the weight of the empty
container, and the maximum weight (b) in the period until the cover
is shut completely is determined. (3) The pressure (c) needed for
sealing the empty container is determined by a formula "b-a". (4)
The container weight (d) after packing is then determined from the
sum of the product of the filling density (D) of the artificial
hair fibers in the container and the volume (V) thereof, and the
empty weight (a) above ("D.times.V+a"). (5) The container main body
is sealed while a particular site of the cover is held during
measurement of the weight of the container after packing, and the
maximum weight (e) in the period until the cover is shut completely
is determined. (6) The pressure (f) needed to seal the container
after packing with the cover is calculated by a formula "e-d-c".
(7) The pressure (g) of the packed artificial hair fibers applied
to the top face of the packaging container is determined by
dividing the pressure (f) by the area of the top face (T)
("f/T").
[0017] When the container is a container in the configuration in
which one side of the cover is connected to the container main body
and the container is sealed as the cover is folded at the boundary
of the cover with the container main body, such as corrugated
fiberboard box, the "particular sites of the cover" means the site
at a center of the top face of the folded cover. Alternatively when
the container is a container that is closed, as a cover is fitted
to the container main body, it may be any site on the cover but, in
this case, it should be a site that permits uniform pressurization
of the entire face of the cover.
[0018] The "hair accessories" in the present invention include
artificial hair products such as wigs, hairpieces, braids,
extensions, weavings and others, as well as artificial hairs for
use as the hairs of dolls.
ADVANTAGEOUS EFFECTS OF INVENTION
[0019] It is possible, by the method of packing the artificial hair
fibers according to the present invention, to pack artificial hair
fibers, while suppressing generation of folding mark during
packaging, transportation, and storage and yet preserving favorable
processability and beauty characteristics.
DESCRIPTION OF EMBODIMENTS
[0020] artificial hair fibers is packed in a packaging container at
a filling density of no lesser than 0.1 kg/l and no more than 0.8
kg/l in a method of packing fiber for artificial hair according to
the present invention.
[0021] Folding mark mostly occurs in the area of the packaging
container where the artificial hair fibers bundles are laid one on
another or in the corners of the container where the fiber bundles
are folded. If artificial hair fibers is packed excessively densely
in a packaging container, the fiber bundles in the area where the
fiber bundles are overlaid or packed in the corners of the
container are folded under large load applied thereon, causing
folding mark. In addition, the fiber bundles are more confined and
fixed spatially in the packaging container and the same parts of
the fiber bundles are consistently laid one on another or placed in
the corners of the container, resulting in easier generation of
folding mark.
[0022] On the contrary, excessively loose packing of artificial
hair fibers in a packaging container leads to deterioration in
efficiencies of transportation and storage. In addition, the
packaging container may become unstabilized and reduced in
strength, and may further broken, when piled.
[0023] For that reason, the filling density of the artificial hair
fibers in the packaging container is preferably 0.1 to 0.8 kg/l and
desirably 0.3 to 0.6 kg/l. It is possible by adjusting the filling
density in the range above to reduce generation of folding mark,
while preserving the transportation and storage efficiencies.
[0024] The artificial hair fibers can be packed in a packaging
container by heretofore known methods. Generally employed is a
method of combining monofilaments obtained after melt spinning,
drawing, heat relaxation and other steps into a fiber bundle of a
certain total fineness, and dropping the fiber bundles from a chute
into a container as they are sprinkled (so-called "sprinkled-into"
method). The fiber bundles may be sprinkled into an internal bag
that is previously placed in the container.
[0025] Generally, fiber bundles are sprinkled-into, while both the
chute and the container are rotated for uniform packing of the
bundles. Specifically, for example, the chute is so rotated that
the fiber bundles drop on the region along a small circle centered
at a site slightly displaced from a center of the container. In
addition, the container is so rotated that the drop position of the
fiber bundles moves along a large circle around the center
identical with that of the container. In this way, the fiber
bundles are laid uniformly in the container. Such a method can be
used preferably in the present invention.
[0026] The amount (m) of the sprinkled-into fiber bundles
discharged per unit time (hereinafter, referred to as discharge
rate, too) is controlled during the sprinkled-into operation, by
adjusting the total fineness of the fiber bundles and the feed rate
into the chute.
[0027] The total fineness of the fiber bundles is determined from
the monofilament fineness after the heat-relaxation treatment step
described below and the number of monofilaments bundled. Supply of
the fiber bundle into chute is synchronized with the
heat-relaxation treatment step, and thus, the feed rate of the
fiber bundle into chute is determined by the temperature of the
heat-relaxation treatment (amount of heat). Specifically, increase
of treatment temperature allows faster heat-relaxation thereby to
increase the feed rate of the fiber bundle into chute.
[0028] The sprinkled-into is continued until the filling density of
the fiber bundles becomes in the range described above. When the
sprinkled-into period then is designated as t, the product of the
discharge rate (m) and the sprinkled-into period (t) (packaging
weight: "m.times.t") is identical with the product of the volume of
the packaging container (V) and the filling density (D)
("V.times.D").
[0029] After completion of packing, the rotation of the chute and
the container is terminated and the fiber bundle is cut. Some of
the artificial hair fibers packed then may be exposed from the
openings of the container because of its bulkiness. In such a case,
it is needed to push the artificial hair fibers into the container
with a cover. In the method of packing fiber for artificial hair
according to the present invention, the pressure of the artificial
hair fibers applied to the top face of the packaging container then
is controlled to be no lesser than 0.1 kPa and no more than 8.0
kPa.
[0030] If the pressure of the artificial hair fibers applied to the
top face of the packaging container is excessively high (in other
words, the pressure of the container top face applied to the
artificial hair fibers is excessively high), large load is applied
to the fiber bundles in the area where the fiber bundles are
overlaid and in the corners of the container, leading to generation
of folding mark. In addition, the fiber bundles are more confined
and fixed spatially in the packaging container and the same parts
of the fiber bundles are consistently laid one on another or placed
in the corners of the container, resulting in easier generation of
folding mark.
[0031] On the other hand, if the pressure of the packaging
container internal wall applied to the artificial hair fibers is
excessively low, the fiber bundles may be disintegrated, and the
disintegrated fiber bundles may be entangled in the container
during transportation. It is needed to withdraw the fiber bundle
from the packaging container during processing of artificial hair
products, but, if the fiber bundles are entangled then, the fiber
bundles are withdrawn less easily, resulting in significant
decrease in processing efficiency.
[0032] Thus, the pressure of the artificial hair fibers applied to
the top face of the packaging container when the cover of the
packaging container is closed is adequately 0.1 to 8.0 kPa, and
desirably 1.0 to 6.0 kPa. It is possible to prevent generation of
folding mark and to assure preferable supply of the fiber bundle,
when the pressure is in the range above.
[0033] A packaging machine commonly used can be used in the
packaging step, and the processing may be carried out by manual
operation. The pressure of the packed artificial hair fibers
applied to the top face of the packaging container can be
determined in the manner described below. The measurement may be
performed every time after packaging, but it is not needed to
determine the pressure every time after packaging, if the packaging
weight ("m.times.t") that can give a pressure to packaging
containers used in the range above is determined previously
according to the following method.
[0034] Specifically in measurement of the pressure of the packed
artificial hair fibers applied to the top face of the packaging
container, the area of the top face (T) and the empty weight (a) of
a packaging container used, and the pressure (c) needed for closing
the empty container with the cover are determined previously.
[0035] Then in the packing step, the weight of a packaging
container (weight (d)="m.times.t+a") containing artificial hair
fibers having a particular packaging weight ("m.times.t" above) is
measured, the container main body is closed with the cover while a
particular site of the cover is held, and the maximum weight (e) in
the period until the cover is shut completely is measured.
[0036] The pressure (g) of the packed artificial hair fibers
applied to the top face of the packaging container can be
determined by dividing the pressure (f) to the cover needed for
closing the container after packing, which is obtained by a formula
"e-d-c", by the area of the top face (T) ("f/T").
[0037] If the fiber bundle is packed by a packaging machine, the
packaging operation may be carried out, as the pressure (g) is
monitored by using an instrument equipped with weight-measuring
means and pressure (g)-calculating means. The weight-measuring
means for use may be a weight scale commonly used that determines
the weight of the packaging container, as the packaging container
is placed thereon. The calculation means for use may be a
general-purpose computer and program. The packaging machine
desirably has an additional function to stop operation and set off
alarm when the pressure (g) rises or declines beyond the range of
0.1 kPa to 8.0 kPa described above.
[0038] The packaging container for use in the method of packing
fiber for artificial hair according to the present invention has a
value, which is obtained by dividing the area of the bottom face
(S) (cm.sup.2) by the height (H) (cm) of the container ("S/H")
(cm), of no lesser than 30 and no more than 300.
[0039] When the S/H value is larger than 300 (i.e., the bottom face
area is greater, compared to the height), a fiber bundle is in
contact with another fiber bundle more frequently during withdrawal
of the fiber bundles from the packaging container, leading to more
entanglement of the fiber bundles.
[0040] On the other hand, when the S/H value is less than 30, since
the container height is greater compared to the bottom face area,
the containers are less stable and may be broken as the strength is
not sufficiently high, when the packaging containers are piled.
[0041] Accordingly, the S/H value of the packaging container is
preferably 30 to 300, and desirably 50 to 250. It is possible to
assure preferable withdrawal of the fiber bundles and stabilized
piling of the packaging containers, when the value is in the range
above.
[0042] The packaging container commonly used is a corrugated
fiberboard box, but may be a container made of a plastic or the
like, and the material is not particularly limited. The size and
the shape of the packaging container are not particularly limited
either.
[0043] Generally, the packed artificial hair fibers is withdrawn
during processing and cut to a desired particular length (ten to
dozens of centimeters), blended with a hair with desired color and
length (hackling), and then, machine-processed into woven-hair, and
further converted to a product after curling/setting, sewing, and
finishing steps. Artificial hair fibers often had folding mark when
processed by conventional packing methods, and thus, the
conventional methods have a problem that the operational efficiency
is lowered significantly by the labor for its correction. In
addition, Woven-hair and the hair accessories (products) obtained
were unsatisfactory in linearity and also uniformity in thickness
of the hair, causing problems in beauty characteristics.
[0044] In contrast, it is possible by the method of packing the
artificial hair fibers according to the present invention to obtain
artificial hair fibers without folding mark, and thus to assure
high operational efficiency. In addition, Woven-hair and other
products obtained are preferable in linearity and uniformity in
thickness of the hair, assuring superior beauty
characteristics.
[0045] The average fineness of the artificial hair fibers for use
in the present invention is preferably 30 to 100 dtex, more
preferably 40 to 90 dtex and still more preferably 50 to 80 dtex.
Use of artificial hair fibers having an average fineness of less
than 30 dtex may lead to deterioration in combing efficiency. On
the other hand, use of artificial hair fibers having an average
fineness of more than 100 dtex, which is higher in rigidity, leads
to deterioration in appearance. The average fineness was determined
by selecting 100 monofilaments at random from a fiber bundle,
measuring the weight of 1 meter of the monofilaments "M", and
converting it to the weight per 10,000 m, and by calculation
according to the following formula: "M.times.10.sup.4/100".
[0046] Various synthetic fibers are usable as the artificial hair
fibers. In particular, fibers based on vinyl chloride, acrylic,
polyester, polypropylene, nylon, and polylactic acid are used
practically, and in particular, vinyl chloride-based and acrylic
fibers are preferable. More preferably, vinyl chloride-based fibers
are preferable, from a viewpoint of the properties of strength,
glossiness, hue, flame resistance, texture, heat shrinkage, and
others. Hereinafter, specific examples of the vinyl chloride-based
fibers will be described.
[0047] Vinyl chloride resins prepared by bulk polymerization,
solution polymerization, suspension polymerization, emulsion
polymerization and others can be used for vinyl chloride-based
fibers, but those prepared by suspension polymerization are
preferably used, for example from the point of early-stage
color-developing efficiency of the monofilament.
[0048] The vinyl chloride resin is not particularly limited, if it
is a homopolymer resin, i.e., a homopolymerization product, of a
heretofore known vinyl chloride or one of heretofore known various
copolymer resins. Any heretofore known copolymer resin may be used
as the copolymer resin. Typical examples thereof include vinyl
chloride-vinyl ester copolymer resins such as vinyl chloride-vinyl
acetate copolymer resins, and vinyl chloride-vinyl propionate
copolymer resins; vinyl chloride-acrylic ester copolymer resins
such as vinyl chloride-butyl acrylate copolymer resins, and vinyl
chloride-2-ethylhexyl acrylate copolymer resins; vinyl
chloride-olefin copolymer resins such as vinyl chloride-ethylene
copolymer resins, and vinyl chloride-propylene copolymer resins;
vinyl chloride-acrylonitrile copolymer resins; and the like.
Particularly preferably, homopolymer resins (homopolymerization
products) of vinyl chloride, vinyl chloride-ethylene copolymer
resins, vinyl chloride-vinyl acetate copolymer resins, and the like
are used. The content of the comonomer in the copolymer resins
above can be determined arbitrarily according to required qualities
such as molding processability and fiber properties. The comonomer
content is preferably 2 to 30% by weight, and particularly
preferably 2 to 20% by weight.
[0049] The viscosity-average polymerization degree of the vinyl
chloride resin is preferably 600 to 2500, and more preferably 600
to 1800. A vinyl chloride resin having a viscosity-average
polymerization degree of less than 600 may have a lower melt
viscosity and give a monofilament easily shrinkable by heat. On the
other hand, a vinyl chloride resin having a viscosity-average
polymerization degree of more than 2500 may have a higher melt
viscosity, leading to increase of nozzle pressure and making it
difficult to give the product safely. The viscosity-average
polymerization degree was determined by dissolving 200 mg of a
resin in 50 ml of nitrobenzene, measuring the specific viscosity of
the polymer solution in a thermostatic oven at 30.degree. C. by
using a Ubbelohde viscometer, and calculating it according to JIS
K6720-2.
[0050] Heretofore known heat stabilizers can be used as the heat
stabilizers. In particular, one or more kinds of heat stabilizers
selected from Ca--Zn-based heat stabilizers, hydrotalcite-based
heat stabilizers, tin-based heat stabilizers, and zeolite-based
heat stabilizers are used preferably. The heat stabilizer is used
for improvement in resistance to thermal decomposition, long-term
stability during molding, and hue of the resulting filament. In
particular, combined use of a Ca--Zn-based heat stabilizer and a
hydrotalcite-based heat stabilizer is preferable, as it gives a
preferable balance between molding processability and filament
properties. These heat stabilizers are used in an amount of
preferably 0.1 to 5.0 parts by weight, and more preferably 0.3 to
3.0 parts by weight, with respect to 100 parts by weight of the
vinyl chloride resin. The hydrotalcite-based heat stabilizer is
specifically a hydrotalcite compound, and more specifically, it is
a composite salt compound containing magnesium and/or alkali metal,
aluminum or zinc, magnesium and aluminum, of which the crystal
water was dehydrated. The hydrotalcite compound may be a natural or
synthetic product, and the synthetic product may be prepared by any
heretofore known methods.
[0051] The resin composition for forming the fiber bundle according
to the present invention contains, according to application,
heretofore known additives used in vinyl chloride resin, in
addition to the vinyl chloride resin. Examples thereof include
lubricants, compatibilizing agents, processing aids, reinforcing
agents, ultraviolet absorbents, antioxidants, antistatic agents,
fillers, flame retardants, pigments, early-stage coloring
improvers, conductivity-enhancing agents, surface-finishing agents,
photostabilizers, flavoring agents, and the like.
[0052] Hereinafter, the method of producing artificial hair fibers
bundle according to the present invention will be described
briefly. The resin composition used may be a powder compound
prepared in a heretofore known mixer, such as Henschel Mixer, super
mixer or ribbon blender, or a pelletized compound prepared by
melt-mixing of the powder compounds. The powder compound can be
produced under a heretofore known common condition, and may be
produced under a hot or cold blend, but in particular, a hot blend
in which the cut temperature during blending is raised to 105 to
155.degree. C., is preferable for reduction of volatile materials
in the resin composition. The pelletized compound is produced in a
manner similar to production of common vinyl chloride-based
pelletized compounds. For example, such a pelletized compound can
be prepared by using a kneading machine such as single screw
extruder, double screw extruder with the screws rotating in
different directions, conical double screw extruder, double screw
extruder with the screws rotating in the same direction,
co-kneader, planetary gear extruder or roll kneading machine. The
condition for production of the pelletized compound is not
particularly limited, but the resin temperature is preferably set
to be 185.degree. C. or lower.
[0053] Conversion from resin composition to fibrous undrawn
filament is carried out by a heretofore known spinning method. The
spinning method is not particularly limited, but is preferably a
melt spinning method. Heretofore known extruders can be used for
the melt spinning. For example, a single screw extruder, a double
screw extruder with the screws rotating in different directions, a
conical double screw extruder, or the like may be used, but in
particular, a single screw extruder having a screw diameter of
about 35 to 85 mm.phi., or a conical extruder having a screw
diameter of about 35 to 50 mm.phi. is preferably used. Excessively
large screw diameter leads to increase in extrusion amount and
excessive increase in nozzle pressure, which in turn may lead to
excessively fast flow of the undrawn filaments, making it difficult
to wind the filaments.
[0054] Heretofore known nozzles may be used in melt spinning. A
nozzle in a shape similar to the cross section of the desired
monofilament is connected to the end part of the die (spinning die)
for melt spinning. Considering the properties for hair dressing
such as curling property, the vinyl chloride resin composition is
preferably processed, as it is melted and extruded, through a
multi-type nozzle plate having multiple nozzle holes having a
nozzle-hole sectional area of 0.5 mm.sup.2 or less, as it is
connected to the die (nozzle hole number: 50 to 300, and nozzle
array number: 1 to 5) into strands of undrawn filaments having a
monofilament fineness of 300 dtex or less.
[0055] Specifically, undrawn filaments are obtained, for example,
by melt-spinning of a pelletized compound of a resin composition at
a die temperature of 160 to 190.degree. C., and more preferably 165
to 185.degree. C., by using a single screw extruder. When the
fineness of the undrawn filament is more than 300 dtex, it is
needed to increase the draw rate during drawing treatment to obtain
low-fineness monofilaments, and the low-fineness monofilament after
the drawing treatment have glossy appearance, thereby making it
difficult to bring the monofilaments in the semi- to 70%-glossiness
state. In addition, the spinning is preferably carried out at a
nozzle pressure of 50 MPa or less during melt spinning. A nozzle
pressure of more than 50 MPa leads to excessive increase of the
load applied to the thrust region of the extruder, easily causing
troubles of the extruder and possibly leading also to "resin
leakage" from the connected regions such as of turn head and
die.
[0056] The undrawn filaments obtained by melt spinning is subjected
to drawing and heat treatment by a known method to give
monofilaments (drawn filaments) having a low fineness of 100 dtex
or less. As for the drawing condition, the draw rate is preferably
about 200 to 400% at a drawing temperature of 90 to 120.degree. C.
in air. A drawing temperature of lower than 90.degree. C. gives a
monofilament lower in strength, and also causes filament breakage
easily, while a drawing temperature of higher than 120.degree. C.
may lead to deterioration in touch feeling of the monofilament,
i.e., conversion to plastic-like touch feeling. Moreover, a draw
rate of less than 200% leads to insufficient expression of the
strength of the monofilament, while a draw rate of more than 400%
may lead to increase in frequency of filament breakage during
drawing.
[0057] In addition, the heat shrinkage percentage of the
monofilament can be reduced by subjecting the monofilament to a
heat-relaxation treatment of treating the filaments in air kept at
a temperature of 110 to 140.degree. C. for relaxation to a length
of 60 to 95% of the length before heat relaxation treatment. The
heat relaxation treatment can be carried out simultaneously or
separately with the drawing treatment. Various heretofore known
melt spinning technologies, such as those concerning nozzle cross
section, heated tube, drawing treatment, and heat treatment, can
also be used arbitrarily in combination in the present
invention.
[0058] The method of producing artificial hair fibers has been
described above, by taking vinyl chloride-based fibers as examples.
Various synthetic fibers can be used as the artificial hair fibers,
as described above, and the heat stabilizer and additives added,
the conditions of the spinning method and the drawing/heat
relaxation processing and other treatments are used, as selected
most suitably according to the synthetic fiber used. For example,
when a fiber of a vinyl chloride-acrylonitrile copolymer resin is
used, the spinning method used is a solution spinning method of
preparing a spinning dope by dissolving the copolymer resin in
acetone and extruding the spinning dope through spinning nozzles
into an aqueous acetone solution.
[0059] The method of packing fiber for artificial hair according to
the present invention is applicable widely to artificial hair
fibers of various synthetic fibers.
EXAMPLES
Example 1
(A) Production of Artificial Hair Fiber
[0060] A mixture containing 100 parts by weight of a vinyl chloride
resin (TH-1000, manufactured by Taiyo Vinyl Corp.,
viscosity-average polymerization degree: 1000), 3 parts by weight
of a hydrotalcite-based composite stabilizer (CP-410A, manufactured
by Nissan Chemical Industries), 0.5 part by weight of an epoxidized
soy bean oil (O-130P, manufactured by Asahi Denka), and 0.8 part by
weight of an ester-based lubricant (EW-100, manufactured by Riken
Vitamin) was heated to 100.degree. C. under agitation in a Henschel
mixer, to give a resin composition.
[0061] The resin composition obtained was melt-spun through a
spinning die having a nozzle cross section in the high-density
cross-sectional shape (see FIG. 1(A)) (nozzle cross-sectional area:
0.06 mm.sup.2, hole number: 120) in a 40-mm single-screw extruder
controlled between 175 to 185.degree. C. at a die temperature of
180.degree. C. and an extrusion quantity of 10 kg/h, to give
undrawn filaments having an average fineness of 160 dtex.
[0062] Subsequently, the melt-spun fiber was drawn to 300% in air
at 100.degree. C. and was subjected to heat-relaxation treatment in
air at 140.degree. C. for shrinkage to a total fiber length of 75%
of that before treatment, to give artificial hair fibers having an
average fineness of 65 dtex.
(B) Filling and Packing into Container
[0063] The artificial hair fibers above were combined to a fiber
bundle having a total fineness of 1,707,000 dtex, which was packed
into a corrugated fiberboard box (45 cm in length, 45 cm in width
and 20 cm in height, bottom face area (S)/height (H)=101) by the
sprinkled-into method.
[0064] A chute vertical in the upper region into which the fiber
bundle is supplied and bent in the "<" shape in the lower region
from which the fiber bundle is discharged was used as the chute.
The chute was rotated around the rotating axis located at the
center of the corrugated fiberboard bottom face at a frequency of
40 rpm. The "<"-shaped discharge port for discharging the fiber
bundle in the lower region of the chute moves then along the
circumference of a circle separated by 15 cm from the center of the
corrugated fiberboard box bottom face.
[0065] In addition, the corrugated fiberboard was rotated by using
the center of the bottom face as axis, while the rotational
frequency was changed in the range of 10 to 30 rpm.
[0066] The fiber bundle was packed uniformly into the corrugated
board box, as the diameter of the circle drawn by the fiber bundle
sprinkled into the corrugated board box was altered by rotating the
chute and the corrugated board box simultaneously in this way.
[0067] The discharge rate was 3 kg/min, and the fiber bundle was
packed to a filling density of 0.5 kg/l.
[0068] The pressure of the packed artificial hair fibers applied to
the top face of the container while the corrugated fiberboard box
after packing is closed was determined in the following manner:
[0069] (1) The empty weight (a) of an empty corrugated board box is
determined. In the present Example, the weight (a) was 1.4 kg.
[0070] (2) The weight (b) of the corrugated fiberboard box when the
top face covers of the corrugated fiberboard box are sequentially
folded manually and the top face covers are closed, as the top face
was pressed manually, during measurement of the weight of the empty
corrugated board box as it is placed on a weight scale was
determined. The weight (b) was 2.4 kg.
[0071] (3) The pressure (c) to the top-face cover needed to seal
the empty corrugated fiberboard box is calculated by a formula
"b-a". The pressure (c) was 1.0 kg.
[0072] (4) The fiber bundle is then packed in the corrugated
fiberboard box at a filling density of (0.5 kg/1), and the weight
(d) thereof is determined. The weight (d) was 20.25 kg.
[0073] (5) While the weight of the corrugated board after packing
is determined as it is placed on a weight scale, the top-face
covers were closed by folding the top face covers of the corrugated
board box sequentially and pressing the center of the top face
manually, together with the fiber bundle extending out of the
corrugated fiberboard box. The weight (e) then was 78.45 kg.
[0074] (6) The pressure (f) needed to close the corrugated
fiberboard box after packing with the cover is calculated by
"e-d-c". The pressure (f) was 57.2 kg.
[0075] (7) The pressure (g) of the packed artificial hair fibers
applied to the top face of the corrugated fiberboard box is
calculated, by dividing the pressure (f) by the area of the top
face (T=45 cm.times.45 cm). The pressure (g) was 2.7 kPa.
(C) Evaluation
(1) Folding Mark
[0076] A package was left under an environment at a temperature of
60.degree. C. and a relative humidity of 50% for 72 hours, and
then, 10 monofilaments of 30 cm in length were collected from the
fiber bundle. The average of the values of "linear length (L) (cm)
of deformed monofilament between edges/real length of monofilament
(L.sub.0) (cm)" of the collected monofilaments was determined, and
the folding mark was evaluated according to the following
evaluation criteria:
[0077] "Good": L/L.sub.0 is 85 or more (no folding mark
observed)
[0078] "Fair": L/L.sub.0 is 75 or more and less than 85 (slight
folding mark observed)
[0079] "Bad": L/L.sub.0 is less than 75 (distinctive folding mark
observed)
(2) Withdrawal Efficiency
[0080] A package was sprinkled into a shaker (Yamato Shaker MODEL
SA-31) under a constant-velocity condition (207
reciprocations/minute) for 6 hours, and one end of the fiber bundle
was held and withdrawn gradually out of the container. The
withdrawal efficiency then was evaluated according to the following
criteria:
[0081] "1": Fiber bundle mostly disintegrated and entangled,
completely prohibiting withdrawal of the fiber bundle
[0082] "2": Fiber bundle disintegrated and entangled, making
withdrawal of the fiber bundle difficult
[0083] "3": Fiber bundle only slightly disintegrated and entangled,
allowing discharge of the fiber bundle without difficulty
[0084] "4": Fiber bundle only slightly disintegrated and entangled,
allowing withdrawal at preferable withdrawal efficiency
[0085] "5": Fiber bundle without disintegration or entanglement,
allowing withdrawal at preferable withdrawal efficiency
(3) Resistance to Withdrawal
[0086] A package was sprinkled into a shaker (Yamato Shaker MODEL
SA-31) under a constant-velocity condition (207
reciprocations/minute) for 6 hours, and then, the fiber bundle was
withdrawn by hands, while one point of the fiber bundle is fixed to
a position 50 cm above the center of the container bottom face. The
resistance to withdrawal then was evaluated according to the
following criteria:
[0087] "1": No fiber bundle withdrawn, prohibiting evaluation
itself
[0088] "2": Withdrawn fiber bundle containing many disintegrated
regions in the later stage of withdrawal, because of simultaneous
withdrawal with other fiber bundles, causing disintegration in
other fiber bundles
[0089] "3": Withdrawn fiber bundle apparently causing simultaneous
withdrawal with other fiber bundles, but the bundles being
separated completely during withdrawal, causing no trouble in
operation
[0090] "4": Withdrawn fiber bundle causing simultaneous withdrawal
with other fiber bundles only slightly, allowing preferable
withdrawal operation
[0091] "5": Withdrawn fiber bundle causing no simultaneous
withdrawal with other fiber bundle, allowing preferable withdrawal
efficiency
Evaluation results are summarized in "Table 1".
TABLE-US-00001 TABLE 1 Ex. 1 Ex. 2 Ex. 3 Ex. 4 Ex. 5 Ex. 6 Ex. 7
Ex. 8 Packing Filling Density (kg/l) 0.50 0.30 0.40 0.60 0.10 0.20
0.70 0.80 condition Pressure applied to 2.7 0.2 0.8 5.3 0 0 7.8
10.5 packaging container top face (kPa) Area of the bottom 101 101
101 101 101 101 101 101 face of container (S)/height (H) Evaluation
Folding mark 94 96 96 90 97 97 85 79 results Withdrawal 5 4 4 5 3 3
58 5 efficiency Resistance to 5 4 4 5 3 3 5 5 withdrawal Ex. 9 Ex.
10 Ex. 11 Ex. 12 Ex. 13 Ex. 14 Ex. 15 Ex. 16 Packing Filling
Density (kg/l) 0.50 0.50 0.50 0.50 0.80 0.80 0.80 0.80 condition
Pressure applied to 2.6 2.4 2.3 2.0 10.3 10.0 9.8 9.5 packaging
container top face (kPa) Area of the bottom 216 300 360 490 216 300
360 490 face of container (S)/height (H) Evaluation Folding mark 94
94 94 94 79 79 79 79 results Withdrawal 5 5 5 5 5 5 5 5 efficiency
Resistance to 5 4 3 3 5 4 3 3 withdrawal
[0092] Consequently, the folding mark was found to be "good", as
L/L.sub.0 is 94. In addition, the withdrawal efficiency and the
resistance to withdrawal were also preferable and both rated at
"5".
Examples 2 to 8
[0093] The filling density was studied in Examples 2 to 8.
Packaging was carried out in a manner similar to Example 1, except
the filling density.
[0094] The filling density was 0.3 kg/l in Example 2. The pressure
of the artificial hair fibers applied to the top face of the
container then was 0.2 kPa. Similarly, the filling density was 0.4
kg/l (pressure to the top face of the container: 0.8 kPa) in
example 3; the filling density was 0.6 kg/l (pressure: 5.3 kPa) in
Example 4; the filling density was 0.1 kg/l (pressure: 0 kPa) in
Example 5; the filling density was 0.2 kg/l (pressure: 0 kPa) in
Example 6; the filling density was 0.7 kg/l (pressure: 7.8 kPa) in
Example 7; and the filling density was 0.8 kg/l (pressure: 10.5
kPa) in Example 8.
[0058]
[0095] Consequently, the L/L.sub.0 values were 79 or more and the
folding mark was rated "fair" in all Examples 2 to 8. The
withdrawal efficiency and the resistance to withdrawal were also
preferable, and both of them were rated at "3" or higher. In
particular in Examples 2 to 4, the L/L.sub.0 values were 90 or
more, and the withdrawal efficiency and the resistance to
withdrawal were evaluated preferable at a rating of "4" or
higher.
Examples 9 to 16
[0096] The container shape (bottom face area (S)/height (H)) was
studied in Examples 9 to 16. The height of the corrugated board box
was altered, while the length and width thereof were left constant,
respectively at 45 cm and 45 cm, for change of the S/H value.
[0097] In Examples 9 to 12, packaging was carried out in a manner
similar to Example 1, except the container shape. The S/H value was
216 in Example 9. The pressure of the artificial hair fibers
applied to the top face of the container then was 2.6 kPa.
Similarly, the S/H value was 300 (pressure to container top face:
2.4 kPa) in Example 10; the S/H value was 360 (pressure: 2.3 kPa)
in Example 11; and the S/H value was 490 (pressure: 2.0 kPa) in
Example 12.
[0098] Consequently in all Examples 9 to 12, the folding mark was
rated "good", as the L/L.sub.0 value was 94. In addition, the
withdrawal efficiency and the resistance to withdrawal were also
preferable and rated all at "3" or higher. In particular in
Examples 9 and 10, the withdrawal efficiency and the resistance to
withdrawal were evaluated preferable at a rating of "4" or
higher.
[0099] Subsequently in Examples 13 to 16, packaging was carried out
in a manner similar to Example 8, except for the container shape.
The S/H value was 216 in Example 13. The pressure of the artificial
hair fibers applied to the top face of the container then was 10.3
kPa. Similarly, the S/H value was 300 (pressure to container top
face: 10 kPa) in Example 14; the S/H value was 360 (pressure: 9.8
kPa) in Example 15; and the S/H value was 490 (pressure: 9.5 kPa)
in Example 16.
[0100] Consequently in all Examples 13 to 16, the folding mark was
evaluated to be "fair", as the L/L.sub.0 value was 79. In addition,
the withdrawal efficiency and the resistance to withdrawal were
also evaluated preferably at a rating of "3" or higher.
Comparative Example 1
[0101] Cases when the filling density is lower were studied in
Comparative Example 1. Packaging was carried out in a similar
manner to Example 1, except that filling density was 0.05 kg/L. The
pressure of the artificial hair fibers applied to the top face of
the container then was 0 kPa.
[0102] Consequently, the folding mark was evaluated to be "good",
as the L/L.sub.0 value was 97. However, the withdrawal efficiency
and the resistance to withdrawal were both rated at "1,"
prohibiting withdrawal of the fiber bundle (see "Table 2").
TABLE-US-00002 TABLE 2 Comparative Comparative Comparative
Comparative Comparative Comparative Comparative Ex. 1 Ex. 2 Ex. 3
Ex. 4 Ex. 5 Ex. 6 Ex. 7 Packing Filling Density (kg/l) 0.50 0.05
0.05 0.05 0.05 0.90 1.00 condition Pressure applied to 0 0 0 0 0
12.4 1.43 packaging container top face (kPa) Area of the bottom
face 101 216 300 360 490 101 101 of container (S)/height (H)
Evaluation Folding mark 97 97 97 97 97 67 55 results Withdrawal
efficiency 1 1 1 1 1 5 4 Resistance to 1 1 1 1 1 5 4 withdrawal
Comparative Examples 2 to 5
[0103] The container shapes in cases when the filling density was
set to be lower were studied in Comparative Examples 2 to 5. In
Comparative Examples 2 to 5, packaging was carried out in a manner
similar to Examples 9 to 12, except that the filling density was
0.05 kg/l. In any one of Comparative Examples 2 to 5, the pressure
of the artificial hair fibers applied to the top face of the
container then was 0 kPa.
[0104] Consequently, the folding mark was evaluated to be "good",
as the L/L.sub.0 value was 97. However, the withdrawal efficiency
and the resistance to withdrawal were both rated at "1,"
prohibiting withdrawal of the fiber bundle.
Comparative Examples 6 and 7
[0105] Cases when the filling density was set to be higher were
studied in Comparative Examples 6 and 7. Packaging was carried out
in a similar manner to Example 1, except that filling density was
set to 0.90 or 1.00 kg/l. The pressure of the artificial hair
fibers applied to the top face of the container then was 12.4 or
14.3 kPa.
[0106] Consequently in Comparative Example 6, the withdrawal
efficiency and the resistance to withdrawal were evaluated
preferably at a rating of "5", but the folding mark was evaluated
to be "bad", as the L/L.sub.0 value was 67. Alternatively, the
L/L.sub.0 value was 55 in Comparative Example 7, indicating
generation of distinguished folding mark.
[0107] The results above show that it is possible to prevent
folding mark and obtain preferable withdrawal efficiency and
resistance to withdrawal by adjusting the filling density of the
artificial hair fibers in packaging container in the range of 0.1
to 0.8 kg/1, and more preferably in the range of 0.3 to 0.6
kg/l.
[0108] The results also showed that it is possible to prevent
folding mark and improve the withdrawal efficiency and the
resistance to withdrawal of the fiber bundle, by adjusting the
pressure of the packed artificial hair fibers applied to the top
face of the packaging container and the container shape (S/H) in
suitable ranges.
Examples 17 to 32 and Comparative Examples 8 to 14
[0109] Tests were carried out by using artificial hair fibers
having different cross-sectional shapes in Examples 17 to 32 and
Comparative Examples 8 to 14.
[0110] Specifically, artificial hair fibers obtained by melt
spinning of a resin composition by using a spinning die having a
nozzle cross section in a low-density cross-sectional shape (see
FIG. 1(B)) (nozzle cross-sectional area: 0.06 mm.sup.2, hole
number: 120) was used. The average fineness of the artificial hair
fibers (undrawn filament) was 160 dtex. Subsequently, the melt-spun
fiber was drawn by 300% in air at 100.degree. C. and
heat-relaxation treated in air at 140.degree. C. for shrinkage to a
total length of 75% of the fiber before treatment, to give
artificial hair fibers having an average fineness of 65 dtex.
[0111] In Example 17, packaging was carried out in a similar manner
to Example 1, by using artificial hair fibers in a low-density
cross-sectional shape. In Examples 18 to 32 and Comparative
Examples 8 to 14, studies were made similarly to the corresponding
Examples 2 to 16 and Comparative Examples 1 to 7, except that the
artificial hair fibers was changed to that in a low-density
cross-sectional shape.
[0112] Evaluation results are summarized in "Table 3" and "Table
4".
TABLE-US-00003 TABLE 3 Ex. 17 Ex. 18 Ex. 19 Ex. 20 Ex. 21 Ex. 22
Ex. 23 Ex. 24 Packing Filling Density (kg/l) 0.50 0.30 0.40 0.60
0.10 0.20 0.70 0.80 condition Pressure applied to 6.5 3.2 4.7 7.9 0
1.0 10.6 11.7 packaging container top face (kPa) Area of the bottom
101 101 101 101 101 101 101 101 face of container (S)/height (H)
Evaluation Folding mark 86 91 88 83 95 93 77 75 results Withdrawal
5 5 5 5 3 5 5 5 efficiency Resistance to 5 5 5 5 3 5 5 5 withdrawal
Ex. 25 Ex. 26 Ex. 27 Ex. 28 Ex. 29 Ex. 30 Ex. 31 Ex. 32 Packing
Filling Density (kg/l) 0.50 0.50 0.50 0.50 0.80 0.80 0.80 0.80
condition Pressure applied to 6.2 6.0 5.8 5.6 11.6 11.5 11.3 11.0
packaging container top face (kPa) Area of the bottom 216 300 360
490 216 300 360 490 face of container (S)/height (H) Evaluation
Folding mark 86 86 86 86 75 75 75 75 results Withdrawal 5 5 5 5 5 5
5 5 efficiency Resistance to 5 4 3 3 5 4 3 3 withdrawal
TABLE-US-00004 TABLE 4 Comparative Comparative Comparative
Comparative Comparative Comparative Comparative Ex. 8 Ex. 9 Ex. 10
Ex. 11 x. 12 Ex. 13 Ex. 14 Packing Filling Density (kg/l) 0.50 0.05
0.05 0.05 0.05 0.90 1.00 condition Pressure applied 0 0 0 0 0 1.46
18.0 to packaging container top face (kPa) Area of the 101 216 300
360 490 101 101 bottom face of container (S)/height (H) Evaluation
Folding mark 95 95 95 95 95 51 40 results Withdrawal 1 1 1 1 1 5 4
efficiency Resistance to 1 1 1 1 1 5 3 withdrawal
[0113] The results showed that the filling density is preferably
0.1 to 0.8 kg/1, and particularly favorably 0.3 to 0.6 kg/l, even
for the artificial hair fibers in the low-density cross-sectional
shape. The results also showed that the artificial hair fibers in
the low-density cross-sectional shape are superior in resistance to
folding mark, withdrawal efficiency and resistance to withdrawal
even at a filling density of 0.2 kg/l.
[0114] It was also found that it is possible to further prevent
generation of the folding mark and improve withdrawal efficiency
and resistance to withdrawal by adjusting the pressure of the
artificial hair fibers applied to the top face of the container and
the container shape S/H in suitable ranges.
Examples 33 to 48 and Comparative Examples 15 to 21
[0115] Artificial hair fibers of an acrylic resin were used in the
studies in Examples 33 to 48 and Comparative Examples 15 to 21.
[0116] The acrylic-resin artificial hair fiber used was a
commercially available product (KL-S, manufactured by Kaneka
Corporation). The cross-sectional shape was dumbbell-like (similar
to the low-density cross-sectional shape shown in FIG. 1(A)), and
the average fineness was 55 dtex.
[0117] In Example 33, packaging was carried out in a similar manner
to Example 1, except the artificial hair fiber of an acrylic resin
in a low-density cross-sectional shape was used. Also in Examples
33 to 48 and Comparative Examples 15 to 21, studies were made
similarly to the corresponding Examples 2 to 16 and Comparative
Examples 1 to 7, except that the artificial hair fiber was changed
to that of the acrylic resin in a low-density cross-sectional
shape.
[0118] Evaluation results are summarized in "Table 5" and "Table
6".
TABLE-US-00005 TABLE 5 Ex. 33 Ex. 34 Ex. 35 Ex. 36 Ex. 37 Ex. 38
Ex. 39 Ex. 40 Packing Filling Density (kg/l) 0.50 0.30 0.40 0.60
0.10 0.20 0.70 0.80 condition Pressure applied to 7.0 3.6 4.8 9.2 0
1.2 10.9 11.8 packaging container (S)/height (H) Area of the bottom
101 101 101 101 101 101 101 101 face of container (S)/height (H)
Evaluation Folding mark 83 90 87 80 95 93 77 75 results Withdrawal
5 5 5 5 3 5 5 5 efficiency Resistance to 5 5 5 5 3 5 5 5 withdrawal
Ex. 41 Ex. 42 Ex. 43 Ex. 44 Ex. 45 Ex. 46 Ex. 47 Ex. 48 Packing
Filling Density (kg/l) 0.50 0.50 0.50 0.50 0.80 0.80 0.80 0.80
condition Pressure applied to 6.9 6.9 6.7 6.6 11.8 11.7 1.6 11.5
packaging container (S)/height (H) Area of the bottom face 216 300
360 490 216 300 360 490 of container (S)/height (H) Evaluation
Folding mark 83 84 83 83 75 75 75 75 results Withdrawal 5 5 5 5 5 5
5 3 efficiency Resistance to 5 4 3 3 5 4 3 3 withdrawal
TABLE-US-00006 TABLE 6 Comparative Comparative Comparative
Comparative Comparative Comparative Comparative Ex. 15 Ex. 16 Ex.
17 Ex. 18 Ex. 19 Ex. 20 Ex. 21 Packing Filling Density (kg/l) 0.50
0.05 0.05 0.05 0.05 0.90 1.00 condition Pressure applied to 0 0 0 0
0 15.0 17.9 packaging container top face (kPa) Area of the bottom
face 101 216 300 360 490 101 101 of container (S)/height (H)
Evaluation Folding mark 95 95 95 95 95 49 39 results Withdrawal 1 1
1 1 1 5 4 efficiency Resistance to 1 1 1 1 1 5 3 withdrawal
[0119] Consequently, it was found that the filling density is
preferably 0.1 to 0.8 kg/1, and particularly preferably 0.3 to 0.6
kg/1, also for the artificial hair fibers of acrylic resin in the
low-density cross-sectional shape. The artificial hair fibers of
acrylic resin gave results preferable in resistance to folding
mark, withdrawal efficiency, and resistance to withdrawal, even at
a filling density of 0.2 kg/l.
[0120] It was also found that it is possible to prevent folding
mark and improve withdrawal efficiency, and resistance to
withdrawal, by adjusting the pressure of the artificial hair fibers
applied to the top face of the container and the container shape
S/H in suitable ranges.
INDUSTRIAL APPLICABILITY
[0121] The present invention is used in packaging, transportation
and storage of artificial hair fibers used in artificial hair
products such as wigs, hairpieces, braids, extensions, and
weavings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0122] FIG. 1 is illustrating a cross-sectional shape of artificial
hair fibers used in Examples: (A): fiber in a high-density
cross-sectional shape, and (B): fiber in a low-density
cross-sectional shape.
* * * * *