U.S. patent application number 15/300420 was filed with the patent office on 2017-05-04 for lyocell fiber.
This patent application is currently assigned to KOLON INDUSTRIES, INC.. The applicant listed for this patent is KOLON INDUSTRIES, INC.. Invention is credited to Jong Cheol JEONG, Sang Woo JIN, Woo Chul KIM, Sang Mok LEE, Sang Yoel LEE.
Application Number | 20170121857 15/300420 |
Document ID | / |
Family ID | 54346678 |
Filed Date | 2017-05-04 |
United States Patent
Application |
20170121857 |
Kind Code |
A1 |
JEONG; Jong Cheol ; et
al. |
May 4, 2017 |
LYOCELL FIBER
Abstract
This invention relates to a lyocell fiber and, more
specifically, to a lyocell fiber exhibiting the same or improved
physical properties even if used in a lesser amount, compared to a
conventional lyocell fiber, by controlling the shape of the section
of a monofilament included in the lyocell fiber to increase the
specific surface area of the fiber.
Inventors: |
JEONG; Jong Cheol;
(Yongin-si, KR) ; KIM; Woo Chul; (Yongin-si,
KR) ; JIN; Sang Woo; (Yongin-si, KR) ; LEE;
Sang Yoel; (Yongin-si, KR) ; LEE; Sang Mok;
(Yongin-si, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
KOLON INDUSTRIES, INC. |
Gwacheon-si, Gyeonggi-do |
|
KR |
|
|
Assignee: |
KOLON INDUSTRIES, INC.
Gwacheon-si, Gyeonggi-do
KR
|
Family ID: |
54346678 |
Appl. No.: |
15/300420 |
Filed: |
March 31, 2015 |
PCT Filed: |
March 31, 2015 |
PCT NO: |
PCT/KR2015/003140 |
371 Date: |
September 29, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
D01D 5/253 20130101;
D01D 5/16 20130101; D01D 10/06 20130101; D01F 2/00 20130101; D01D
5/06 20130101 |
International
Class: |
D01F 2/00 20060101
D01F002/00; D01D 10/06 20060101 D01D010/06; D01D 5/16 20060101
D01D005/16; D01D 5/253 20060101 D01D005/253; D01D 5/06 20060101
D01D005/06 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 31, 2014 |
KR |
10-2014-0038046 |
Mar 30, 2015 |
KR |
10-2015-0044318 |
Claims
1. A lyocell fiber comprising: a lyocell multifilament manufactured
by spinning a lyocell spinning dope including a cellulose pulp and
an N-methylmorpholine-N-oxide (NMMO) aqueous solution, wherein the
multifilament includes a monofilament having a multi-lobal section,
the multi-lobal section includes a plurality of projections, and
the plurality of projections comes into contact with a first
virtual circle and a second virtual circle, included in the first
virtual circle, is integrally formed with the second virtual
circle, serving as a core, and comes into contact with the first
virtual circle at ends thereof.
2. The lyocell fiber of claim 1, wherein the lyocell spinning dope
includes 6 to 16 wt % of the cellulose pulp and 84 to 94 wt % of
the N-methylmorpholine-N-oxide aqueous solution.
3. The lyocell fiber of claim 2, wherein the cellulose pulp has an
alpha-cellulose content of 85 to 97 wt % and a degree of
polymerization (DPw) of 600 to 1700.
4. The lyocell fiber of claim 1, wherein a space occupancy ratio
defined in a following Equation 1 is 150 to 400%: Space occupancy
ratio (%)=(Area of first virtual circle/sectional area of
monofilament included in lyocell fiber).times.100. <Equation
1>
5. The lyocell fiber of claim 1, wherein the first virtual circle
has a radius of 8 to 30 .mu.m.
6. The lyocell fiber of claim 1, wherein the second virtual circle
has a radius of 3 to 12 .mu.m.
7. The lyocell fiber of claim 1, wherein the first virtual circle
and the second virtual circle are concentric.
Description
TECHNICAL FIELD
[0001] The present invention relates to a lyocell fiber.
BACKGROUND ART
[0002] A fiber is a piece of natural or synthetic linear material
that is flexible and thin and has a high ratio of length to
thickness. Fibers are classified into long fibers, semi-long
fibers, and staple fibers according to the type thereof, and into
natural fibers and synthetic fibers according to the raw material
thereof.
[0003] Fibers have had a close relationship with human life since
old times, and natural fibers such as cotton, linen, wool, and silk
have long been used as the main raw material for clothes. The use
of fibers has extended beyond a material for clothes to industrial
materials in accordance with the advancement of science and
technology since the industrial revolution. In order to meet the
rapidly growing demand for fibers due to cultural development and
the increase in population, synthetic fibers have been developed as
novel fiber materials.
[0004] Among synthetic fibers, regenerated fibers have an excellent
tactile and wearing sensation and a very fast water-absorbing and
discharging ability, compared to cotton, thus being frequently used
as the raw material of clothes. In particular, rayon fibers, among
regenerated fibers, have excellent gloss and color development and
realize the same tactile sensation as natural fibers. Rayon fibers
are considered to be a material that is harmless to the human body,
and accordingly, have been used extensively in the past. However,
rayon fibers easily shrink and wrinkle, the manufacturing process
thereof is complicated, and a lot of chemicals are used during a
process for melting wood pulp, which causes environmental pollution
in work and during wastewater treatment.
[0005] Accordingly, a study has been made to find fibers that are
not harmful to the environment and the human body and have
excellent physical properties compared to other fibers. Recently,
lyocell fibers manufactured using natural pulp and amine oxide
hydrate have been proposed. Lyocell fibers have excellent physical
fiber properties such as tensile strength and tactile sensation,
compared to conventional regenerated fibers, and do not cause any
contamination during the production process thereof, an amine
oxide-based solvent used to form the lyocell fibers may be
recycled, and the lyocell fibers are biodegradable when use thereof
has been completed. Accordingly, lyocell fibers have been used as
environment-friendly fibers in various fields.
[0006] However, current lyocell fibers can be produced only in the
form of products having a circular section. Since it is expected
that lyocell fibers may be imparted with various physical
properties depending on the sectional shape thereof, there is a
demand for a technology for manufacturing lyocell fibers having
various types of sections.
DISCLOSURE
Technical Problem
[0007] Accordingly, the present invention has been made keeping in
mind the above problems occurring in the related art, and an object
of the present invention is to provide a lyocell fiber having a
large specific surface area.
Technical Solution
[0008] In order to accomplish the above object, the present
invention provides a lyocell fiber including a lyocell
multifilament manufactured by spinning a lyocell spinning dope
including a cellulose pulp and an N-methylmorpholine-N-oxide (NMMO)
aqueous solution. The multifilament includes a monofilament having
a multi-lobal section, the multi-lobal section includes a plurality
of projections, and the plurality of projections comes into contact
with a first virtual circle and a second virtual circle, included
in the first virtual circle, is integrally formed with the second
virtual circle serving as a core, and comes into contact with the
first virtual circle at ends thereof.
[0009] The lyocell spinning dope may include 6 to 16 wt % of the
cellulose pulp and 84 to 94 wt % of the N-methylmorpholine-N-oxide
aqueous solution.
[0010] The cellulose pulp may have an alpha-cellulose content of 85
to 97 wt % and a degree of polymerization (DPw) of 600 to 1700.
[0011] In the lyocell fiber, a space occupancy ratio defined in the
following Equation 1 may be 150 to 400%.
Space occupancy ratio (%)=(Area of first virtual circle/sectional
area of monofilament included in lyocell fiber).times.100
<Equation 1>
[0012] The first virtual circle may have a radius of 8 to 30
.mu.m.
[0013] The second virtual circle may have a radius of 3 to 12
.mu.m.
Advantageous Effects
[0014] According to the present invention, a lyocell fiber having a
large specific surface area is provided in a manner capable of
exhibiting the same or improved physical properties even if used in
a lesser amount, compared to a conventional lyocell fiber, when the
lyocell fiber is applied to reinforcing materials in the clothing,
construction, and vehicle fields.
DESCRIPTION OF DRAWINGS
[0015] FIG. 1 shows a section of a monofilament included in a
lyocell fiber according to an embodiment of the present invention;
and
[0016] FIGS. 2a to 2c show the sections of lyocell fibers
manufactured in Examples of the present invention, and FIGS. 2a,
2b, and 2c are pictures showing the sections of the lyocell fibers
manufactured in Examples 1, 2, and 3, respectively.
DESCRIPTION OF THE REFERENCE NUMERALS IN THE DRAWINGS
[0017] 1: Core, 2: Projection, 3: Long axis of projection, [0018]
4: Recess of projection, 5: End of projection, [0019] 11: First
virtual circle, 12: Second virtual circle
BEST MODE
[0020] Hereinafter, the present invention will be described in
greater detail.
[0021] The present invention relates to a lyocell fiber including a
lyocell multifilament manufactured by spinning a lyocell spinning
dope including a cellulose pulp and an N-methylmorpholine-N-oxide
(NMMO) aqueous solution. The multifilament includes a monofilament
having a multi-lobal section, and the multi-lobal section includes
a plurality of projections. The plurality of projections comes into
contact with a first virtual circle and a second virtual circle,
included in the first virtual circle, is integrally formed with the
second virtual circle, which serves as a core, and comes into
contact with the first virtual circle at ends thereof.
[0022] [Multi-Lobal Section]
[0023] In the present invention, a multi-lobal section is a section
including a plurality of projections. Specifically, as shown in
FIG. 1, the multi-lobal section is a section including one core 1
and a plurality of projections formed around the core so as to be
integrated with the core.
[0024] Specifically, the size and the shape of the multi-lobal
section may be defined within the boundary of a first virtual
circle 11 connecting the ends of the plurality of projections, and
the boundary of a second virtual circle 12 included in the first
virtual circle 11. The radius of the first virtual circle 11 is
larger than that of the second virtual circle 12, and the first
virtual circle 11 and the second virtual circle 12 may be
preferably concentric. However, the first virtual circle 11 and the
second virtual circle 12 may not be concentric.
[0025] The multi-lobal section includes the plurality of
projections. The plurality of projections is integrally formed with
the core 1 overlapping the second virtual circle 12, ends 5 of the
projections come into contact with the first virtual circle 11, and
a recess 4 formed between the projections comes into contact with
the second virtual circle 12.
[0026] In the present invention, the multi-lobal section may
include three projections in order to maximize the specific surface
area of the lyocell fiber.
[0027] The first virtual circle and the second virtual circle may
have radii of 8 to 30 .mu.m and 3 to 12 .mu.m, respectively.
[0028] When the radius of the first virtual circle is 8 .mu.m or
more, the multi-lobal section may be embodied, and when the radius
is 30 .mu.m or less, a monofilament having a denier suitable as
that of fiber products may be formed. Further, when the radius of
the second virtual circle is 3 .mu.m or more, the multi-lobal
section may be embodied, and when the radius is 12 .mu.m or less, a
monofilament having a denier suitable as that of fiber products may
be formed.
[0029] The monofilament included in the lyocell fiber according to
the present invention may have the aforementioned multi-lobal
section, and in the lyocell fiber, a space occupancy ratio, defined
in the following Equation 1, may be 150 to 400%.
Space occupancy ratio (%)=(Area of first virtual circle/sectional
area of monofilament included in lyocell fiber).times.100
<Equation 1>
[0030] The space occupancy ratio means the ratio of the substantial
occupancy space of the monofilament in the fiber, depending on the
projections of the multi-lobal section. That is, when the
monofilament included in the lyocell fiber has a circular section,
since the sectional area of the monofilament is the same as the
area of the first virtual circle, the space occupancy ratio,
defined above, becomes 100%. However, in the case of the fiber
having the multi-lobal section including the projections, the
actual occupancy area of the fiber is increased due to the
projections. Therefore, it can be seen that the specific surface
area of the fiber is increased as the space occupancy ratio is
increased.
[0031] The lyocell fiber of the present invention has excellent
properties such as swelling, interface adhesion, and quick drying
due to an increase in specific surface area, and has a space
occupancy ratio, defined in Equation 1, of 150 to 400%, and
preferably 300 to 400%.
[0032] Meanwhile, the present invention relates to a method of
manufacturing a lyocell fiber. The method includes (S1) spinning a
lyocell spinning dope including a cellulose pulp and an
N-methylmorpholine-N-oxide (NMMO) aqueous solution, (S2)
solidifying the lyocell spinning dope, spun during the step (S1),
to obtain a lyocell multifilament, (S3) washing the lyocell
multifilament obtained during the step (S2), and (S4) treating the
lyocell multifilament, washed during the step (S3), using an
emulsion. The multifilament includes a monofilament having a
multi-lobal section, the multi-lobal section includes a plurality
of projections, and the plurality of projections comes into contact
with both a first virtual circle and a second virtual circle
included in the first virtual circle, is integrally formed with the
second virtual circle, which serves as a core, and comes into
contact with the first virtual circle at ends thereof.
[0033] [Step (S1)]
[0034] During the step (S1), the lyocell spinning dope including
the cellulose pulp and the N-methylmorpholine-N-oxide (NMMO)
aqueous solution is spun.
[0035] The lyocell spinning dope may include 6 to 16 wt % of the
cellulose pulp and 84 to 94 wt % of the N-methylmorpholine-N-oxide
aqueous solution. The cellulose pulp may have an alpha-cellulose
content of 85 to 97 wt % and a degree of polymerization (DPw) of
600 to 1700.
[0036] When the content of the cellulose pulp in the lyocell
spinning dope is less than 6 wt %, it may be difficult to ensure
fibrous characteristics, and when the content is more than 16 wt %,
it may be difficult to dissolve the pulp in the aqueous
solution.
[0037] Further, when the content of the N-methylmorpholine-N-oxide
aqueous solution in the lyocell spinning dope is less than 84 wt %,
the dissolution viscosity may be significantly increased, which is
undesirable. When the content is more than 94 wt %, the spinning
viscosity may be significantly reduced, making it difficult to
ensure uniform fibers during the spinning step.
[0038] The weight ratio of N-methylmorpholine-N-oxide and water may
be 93:7 to 85:15 in the N-methylmorpholine-N-oxide aqueous
solution. When the weight ratio of N-methylmorpholine-N-oxide is
more than 93(%), the dissolution temperature may be increased, thus
decomposing cellulose during the dissolution of the cellulose. When
weight ratio of N-methylmorpholine-N-oxide is less than 85(%), the
dissolution capability of the solvent may be reduced, making it
difficult to dissolve cellulose.
[0039] The spinning dope is discharged through the spinning nozzle
of a spinneret. The spinning dope on the filament is discharged
through the air gap section of the spinneret into a solidifying
solution in a solidifying bath. The spinning dope may be discharged
from the spinneret at a spinning temperature of 80 to 130.degree.
C.
[0040] The spinneret may have a plurality of unit holes when one
unit hole is set to include a plurality of holes. The number of
holes included in the unit hole may be the same as the number of
projections of the multi-lobal section. For example, the number of
holes included in the unit hole may be three in order to
manufacture a lyocell fiber that includes a monofilament having a
multi-lobal section including three projections.
[0041] [Step (S2)]
[0042] During the step (S2), the lyocell spinning dope, spun during
the step (S1), is solidified to obtain the lyocell multifilament.
The solidification of the step (S2) may include a primary
solidifying step of supplying cooled air to the spinning dope to
solidify the spinning dope using air quenching (Q/A) and a
secondary solidifying step of adding the primarily solidified
spinning dope to the solidifying solution to solidify the spinning
dope.
[0043] During the (S1) step, the spinning dope may be discharged
through the spinneret and then pass through the air gap section
between the spinneret and the solidifying bath. Cooled air is
supplied from a donut-shaped air cooler, positioned in the
spinneret, to the air gap section in the outward direction from the
inside of the spinneret. Cooled air may be supplied to the spinning
dope to primarily solidify the spinning dope using air
quenching.
[0044] Factors affecting the physical properties of the lyocell
multifilament obtained during the step (S2) are the temperature and
the wind speed of cooled air in the air gap section. Cooled air may
be supplied to the spinning dope at a temperature of 4 to
15.degree. C. and a wind speed of 5 to 50 m/s to thus solidify the
spinning dope during the step (S2).
[0045] When the temperature of cooled air is lower than 4.degree.
C. during primary solidification, the surface of the spinneret is
cooled, the sections of the lyocell multifilaments become
nonuniform, and spinning processability is reduced. When the
temperature is higher than 15.degree. C., primary solidification
using cooled air is insufficiently performed, reducing spinning
processability.
[0046] Further, when the wind speed of cooled air is less than 5
m/s during primary solidification, primary solidification using
cooled air is insufficiently performed, reducing the spinning
processability causing yarn breakage. When the wind speed is more
than 50 m/s, spinning dope is discharged from the spinneret while
being shaken due to the air, thus reducing spinning
processability.
[0047] After primary solidification using air quenching, the
spinning dope may be supplied to the solidifying bath containing
the solidifying solution to thus perform secondary solidification.
Meanwhile, the temperature of the solidifying solution may be
30.degree. C. or less in order to perform appropriate secondary
solidification. With regard to this, since the secondary
solidification temperature is not unnecessarily high, an
appropriate solidifying speed is maintained. The solidifying
solution may be manufactured so as to have a typical composition in
the art to which the present invention belongs, and accordingly,
the solidifying solution is not particularly limited.
[0048] [Step (S3)]
[0049] During the step (S3), the lyocell multifilament obtained
during the step (S2) is washed.
[0050] Specifically, the lyocell multifilament obtained during the
step (S2) may be transported to a pulling roller and then to a
washing bath to thus be washed.
[0051] When the filament is washed, in consideration of ease of
recovery and reuse of a solvent after washing, a washing solution
having a temperature of 0 to 100.degree. C. may be used, and water
may be used as the washing solution, and other additive components
may be further included if necessary.
[0052] [Step (S4)]
[0053] During the step (S4), the lyocell multifilament washed
during the step (S3) may be treated using an emulsion and then
dried.
[0054] For treatment using the emulsion, the multifilament is
completely immersed in the emulsion to be coated, and the amount of
the emulsion applied on the filament is maintained using squeezing
rollers attached to a feeding roll and a discharging roll of an
emulsion-treatment apparatus. The emulsion serves to reduce
friction caused when the filament comes into contact with a drying
roller and a guide during a crimping step.
[0055] The lyocell fiber is biodegradable and thus environmentally
friendly.
[0056] Further, in the lyocell fiber, since the monofilament has a
multi-lobal section including a plurality of projections, the
specific surface area thereof is increased. Accordingly, the
manufactured lyocell fiber may exhibit the same or improved
physical properties even if used in a lesser amount, compared to a
conventional lyocell fiber having a circular section.
[0057] Particularly, the lyocell fiber according to the present
invention has a large specific surface area, which exhibits the
same or improved physical properties, compared to a conventional
lyocell fiber, even if used in a lesser amount when the lyocell
fiber is applied as a reinforcing material in the clothing,
construction, and vehicle fields.
[0058] When the lyocell fiber according to the present invention is
used for clothes, the lyocell fiber exhibits excellent properties
such as hygroscopicity and quick drying due to the large specific
surface area thereof. Accordingly, the lyocell fiber does not cling
to the body, even a sweaty body, thereby always providing a
pleasant state to the skin to thus reduce discomfort. Further, the
lyocell fiber helps to quickly and continuously dry sweat. Specific
examples of application of the lyocell fiber for use in clothes may
include outdoor wear, sportswear, t-shirts, golf wear, men's and
women's clothing, functional underwear, hats, sports socks, and
underwear.
[0059] When the lyocell fiber according to the present invention is
used as a reinforcing material, a reinforcing ability is increased
as a contact area between the lyocell fiber and materials to be
reinforced is increased. The lyocell fiber may be applied to MRG
(mechanical rubber goods), such as tire cords and hose reinforcing
materials, cement reinforcing materials, and interior materials of
vehicles.
MODE FOR INVENTION
[0060] A better understanding of the present invention may be
obtained through the following Examples. It will be apparent to
those skilled in the art that the following Examples are intended
to illustrate the present invention but are not to be construed to
limit the scope of the present invention.
Example 1
[0061] Cellulose pulp having a degree of polymerization (DPw) of
820 and an alpha-cellulose content of 93.9% was mixed with an
NMMO/H.sub.2O mixture solvent (a weight ratio 90/10) having a
propyl gallate content of 0.01 wt % to manufacture 12 wt % of a
spinning dope for use in a lyocell fiber.
[0062] The spinning dope was maintained at a spinning temperature
of 110.degree. C. in a spinning nozzle of a spinneret having a
plurality of unit holes each including three holes. The spinning
dope was spun while the discharge amount and the spinning speed of
the spinning dope were controlled so that the monodenier of the
filament was 3.37 denier. The spinning dope, discharged from the
spinning nozzle, on the filament was supplied through an air gap
section to a solidifying solution in a solidifying bath. The
spinning dope was primarily solidified in the air gap section using
cooled air at a temperature of 8.degree. C. and a wind speed of 10
m/s.
[0063] The solidifying solution included 85 wt % of water and 15 wt
% of NMMO at 25.degree. C.
[0064] The concentration of the solidifying solution was
continuously monitored using a sensor and a refractometer.
[0065] The filament elongated in an air layer using a pulling
roller was washed using a sprayed washing solution in a washing
apparatus to remove remaining NMMO. After an emulsion was uniformly
applied on the filament, the resultant filament was squeezed so
that the content of the emulsion in the filament was maintained at
0.2%, and dried using a drying roller at 150.degree. C. to
manufacture a lyocell fiber including a multifilament. The
multifilament included a monofilament having a multi-lobal section
including three projections.
Example 2
[0066] The same procedure as Example 1 was repeated to manufacture
a lyocell fiber, which included a multifilament including a
monofilament having a multi-lobal section including three
projections, except that the monodenier of the filament was 3.58
denier.
Example 3
[0067] The same procedure as Example 1 was repeated to manufacture
a lyocell fiber, which included a multifilament including a
monofilament having a multi-lobal section including three
projections, except that the monodenier of the filament was 14.82
denier.
Comparative Example 1
[0068] The same procedure as Example 1 was repeated to manufacture
a lyocell fiber, which included a multifilament including a
monofilament having a circular section, except that the spinneret
that was used had a plurality of unit holes each including one hole
having a circular section, and that the monodenier of the filament
was 1.73 denier.
Comparative Example 2
[0069] The same procedure as Comparative Example 1 was repeated to
manufacture a lyocell fiber, which included a multifilament
including a monofilament having a circular section, except that the
monodenier of the filament was 2.97 denier.
[0070] The shape of the section, the denier, and the space
occupancy ratio of the monofilament that was included in the
lyocell fiber manufactured in the Examples and the Comparative
Examples were measured and calculated using the following methods,
and the results are set forth in the following Table 1.
[0071] (1) Sectional Shape of the Monofilament Included in the
Lyocell Fiber
[0072] A few bundles of fibers were sampled and then rolled
together with black cotton. The resultant fiber was processed to be
thin and then inserted into a hole in a plate that was used to
transversely cut the fiber. Subsequently, the fiber was cut using a
razor blade in a way such that the shape of the section thereof was
not changed.
[0073] The cut section of the fiber was magnified (.times.200) and
observed using an optical microscope (BX51, products manufactured
by Olympus Corporation), and the image of the section was stored
using a digital camera. The desired section was selected and the
radius and the area of the section were analyzed using an image of
the section of the fiber according to the Olympus soft imaging
solution program.
[0074] (2) Denier
[0075] The denier of the lyocell fiber was calculated from the
sectional area of the monofilament of the real lyocell fiber, which
was obtained from the section analysis, and the density of the
lyocell fiber using the following Equation 2.
[0076] Density of lyocell fiber=1.49 g/cm.sup.3
Denier (De)=[Sectional area of monofilament of lyocell fiber
(.mu.m.sup.2).times.Density of lyocell fiber
(g/cm.sup.3).times.9000 (m)]/1000000 <Equation 2>
[0077] (3) Space Occupancy Ratio
[0078] The space occupancy ratio of the lyocell fiber was
calculated using the following Equation 1.
Space occupancy ratio (%)=(Area of first virtual circle/sectional
area of monofilament included in lyocell fiber).times.100
<Equation 1>
TABLE-US-00001 TABLE 1 Shape of section of monofilament included in
lyocell fiber Radius Radius Sectional of of area of first second
Area of mono- Space virtual virtual first filament occu- circle
circle virtual of actual pancy (L1, (L2, circle lyocell Denier L1/L
ratio .mu.m) .mu.m) (.mu.m.sup.2) fiber (.mu.m.sup.2) (De) 2 (%)
Example 1 16.75 3.87 881 251.6 3.37 4.33 350 Example 2 11.44 6.16
411 266.6 3.58 1.86 154 Example 3 27.78 11.61 2423 1105 14.82 2.40
219 Com- 6.4 6.4 129 129 1.73 1 100 parative Exam- ple 1 Com- 8.4
8.4 222 222 2.97 1 100 parative Exam- ple 2
[0079] As shown in Table 1, the lyocell fiber including the
monofilament having the multi-lobal section of Examples 1 to 3
exhibited a space occupancy ratio larger than that of the lyocell
fiber including the monofilament having the circular section of
Comparative Examples 1 and 2. The section of the lyocell fiber of
Examples 1 to 3 is shown in FIGS. 2a to 2c.
INDUSTRIAL APPLICABILITY
[0080] From the aforementioned results, it can be seen that the
lyocell fiber of Examples 1 to 3 has a large specific surface area
and may be extensively applied in fields requiring a fiber having a
large specific surface area.
[0081] Although the preferred embodiments of the present invention
have been disclosed for illustrative purposes, those skilled in the
art will appreciate that various modifications, additions and
substitutions are possible, without departing from the scope and
spirit of the invention as disclosed in the accompanying
claims.
* * * * *