U.S. patent application number 13/342607 was filed with the patent office on 2013-07-04 for hair extension and process for the same.
The applicant listed for this patent is Soung Jun LEE. Invention is credited to Soung Jun LEE.
Application Number | 20130167858 13/342607 |
Document ID | / |
Family ID | 48693854 |
Filed Date | 2013-07-04 |
United States Patent
Application |
20130167858 |
Kind Code |
A1 |
LEE; Soung Jun |
July 4, 2013 |
HAIR EXTENSION AND PROCESS FOR THE SAME
Abstract
A hair extension is disclosed, which can be used repeatedly and
has extension hairs that is rarely lost and easy to be attached to
and detached from. The hair extension includes a extension hair
portion having a plurality of extension hairs and a binding portion
for tying one ends of the extension hairs, and the binding portion
includes a sheet binding portion for fixing the one ends integrally
by melt-and-gluing two synthetic resin sheets with the one ends
in-between.
Inventors: |
LEE; Soung Jun; (Bogor,
ID) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
LEE; Soung Jun |
Bogor |
|
ID |
|
|
Family ID: |
48693854 |
Appl. No.: |
13/342607 |
Filed: |
January 3, 2012 |
Current U.S.
Class: |
132/201 ;
132/54 |
Current CPC
Class: |
A41G 5/0066 20130101;
A41G 5/004 20130101 |
Class at
Publication: |
132/201 ;
132/54 |
International
Class: |
A41G 5/00 20060101
A41G005/00; A41G 3/00 20060101 A41G003/00 |
Claims
1. A hair extension comprising a extension hair portion including a
plurality of strands of extension hairs and a binding portion for
tying one ends of the extension hairs into one, wherein the binding
portion comprises a sheet binding portion in which two sheets of
synthetic resin overlapped with the one ends in-between are molten
and glued so as to fix the one ends into one body.
2. The hair extension of claim 1, wherein the synthetic resin sheet
is a polyurethane sheet.
3. The hair extension of claim 1, wherein the extension hair
portion comprises a first sub-extension hair portion and a second
sub-extension hair portion disposed in layers together with the
first sub-extension hair portion, and wherein the sheet binding
portion is formed by melting and gluing with neighboring ones a
first polyurethane sheet disposed at an outer side of the first
sub-extension hair portion opposite to the second sub-extension
hair portion, a second polyurethane sheet disposed between the
first and second sub-extension hair portions, and a third
polyurethane sheet disposed at an outer side of the second
sub-extension hair portion opposite to the first sub-extension hair
portion.
4. The hair extension of claim 1, wherein the extension hair
portion comprises a first sub-extension hair portion, a second
sub-extension hair portion disposed in layers together with the
first sub-extension hair portion, a third sub-extension hair
portion disposed in layers on the second sub-extension hair portion
opposite to the first sub-extension hair portion, and the sheet
binding portion is formed by melting and gluing with neighboring
ones a first polyurethane sheet disposed at an outer side of the
first sub-extension hair portion opposite to the second
sub-extension hair portion, a second polyurethane sheet disposed
between the first and second sub-extension hair portions, a third
polyurethane sheet disposed between the second and third
sub-extension hair portions, and a fourth polyurethane sheet
disposed at an outer side of the third sub-extension hair portion
opposite to the second sub-extension hair portion.
5. The hair extension of claim 1, wherein the synthetic resin is a
polyurethane sheet with thickness of 0.06.about.0.1 mm.
6. The hair extension of claim 1, wherein the extension hairs of
the extension hair portion are disposed in a plane.
7. The hair extension of claim 4, wherein in each of the first
through third sub-extension hair portions, the extension hairs are
disposed in a plane and there are 1 to 5 strands in the direction
of thickness.
8. The hair extension of claim 1, wherein in the sheet binding
portion are formed holes with intervals.
9. The hair extension of claim 2, wherein in the sheet binding
portion are formed holes with intervals.
10. The hair extension of claim 3, wherein in the sheet binding
portion are formed holes with intervals.
11. The hair extension of claim 4, wherein in the sheet binding
portion are formed holes with intervals.
12. A process for manufacturing a hair extension, the process
comprising: a first step for disposing two synthetic resin sheets
in layers with one end of a first sub-extension hair portion
in-between; and a first step for melt-and-gluing the one end of the
first sub-extension hair portion between the two synthetic resin
sheets by melt-and-gluing the two synthetic resin sheets while
pressing the two synthetic resin sheets toward each other.
13. The process of claim 12, wherein the synthetic resin sheet is a
polyurethane sheet, and further comprising: a second step for
disposing additional polyurethane sheet on a portion in which a
second sub-extension hair portion is stacked in layers on the first
sub-extension hair portion and one end of the second sub-extension
hair portion is overlapped on the molten and glued portion of the
two polyurethane sheets; and a second step for melt-and-gluing the
additional polyurethane sheet by heating while pressing to the
molten and glued portion and fixing the second sub-extension hair
portion between the additional polyurethane sheet and a portion
where the two polyurethane sheets are molten and glued.
14. The process of claim 13, further comprising: a third step for
disposing a newly added polyurethane sheet on a portion in which a
third sub-extension hair portion is stacked in layers on the second
sub-extension hair portion and one end of the third sub-extension
hair portion is overlapped on the molten and glued portion of the
three polyurethane sheets; and a third step for melt-and-gluing the
newly added polyurethane sheet by heating while pressing to the
molten and glued portion and fixing the third sub-extension hair
portion between the newly added polyurethane sheet and a portion
where the three polyurethane sheets are molten and glued.
15. The process of claim 12, wherein the thickness of the synthetic
resin is 0.06.about.0.1 mm.
16. The process of claim 14, wherein in each of the first through
third sub-extension hair portions, the extension hairs are disposed
in a plane and there are 1 to 5 strands in the direction of
thickness.
17. The process of claim 12, wherein the synthetic resin sheet is
polyurethane sheet, and the temperature of the polyurethane sheet
in the first step for melt-and-gluing is 150.about.160 degrees in
Celsius, and the pressure is 30.about.50 kg per centimeter
squared.
18. The process of claim 12, further comprising a step for forming
a plurality of holes with intervals where the synthetic resin
sheets stacked in layers are molten and glued.
19. The process of 13, further comprising a step for forming a
plurality of holes with intervals where the synthetic resin sheets
stacked in layers are molten and glued.
20. The process of claim 14, further comprising a step for forming
a plurality of holes with intervals where the synthetic resin
sheets stacked in layers are molten and glued.
Description
FIELD OF TECHNOLOGY
[0001] The invention relates to a hair extension and process for
the same, especially to a hair extension and process for the same,
which enables users to have hairstyles of excellent hair quality,
affluent hair, or long hair by extending hairs of the user.
BACKGROUND OF INVENTION
[0002] Conventional hair extension is made by connecting one ends
of flatly-arranged extension hairs into one by sewing, which was to
attach to the user's hairs with hair clip or regular hair pin.
[0003] In such conventional hair extension, since the extension
hairs were detached from part fixed by sewing or entangled, it was
not able to be used repeatedly.
[0004] Also, since such conventional hair extension is unable to
keep in place in an attached state to the user's hairs, it must be
treated often.
[0005] Additionally, since such conventional hair extension was
thick and had extension hairs divided and tied in sewing threads by
a few strands by strands, there were many bumps on the surfaces.
Therefore, such conventional hair extension had rough surfaces.
[0006] Since such conventional hair extension was hard to attach to
the user's hairs and connected tightly to the user's hairs, the
user had problems to move head freely.
DISCLOSURE
Problems to Solve
[0007] The object of the invention is to provide a hair extension,
in which extension hairs are not detached or entangled since they
are fixed strongly.
[0008] Another object of the invention is to provide a hair
extension, in which density or total number of extension hairs in a
direction of thickness can be controlled easily in the process for
manufacturing the hair extension.
[0009] Still another object of the invention is to provide a hair
extension, which keeps initial state of being attached to user's
hairs for a long time.
[0010] Still another object of the invention is to provide a hair
extension, in which since it is possible to attach to the user's
hairs with some movability it is easy to move after being attached
and it keeps the attached state for a long time.
[0011] Still another object of the invention is to provide a hair
extension, which can be used repeatedly many times.
[0012] Still another object of the invention is to provide a hair
extension, which has smooth surfaces compared to conventional
ones.
[0013] Still another object of the invention is to provide a hair
extension, which is easy to attach to the user's hairs.
[0014] Still another object of the invention is to provide a
process for manufacturing a hair extension according to the
invention.
Solutions to Problems
[0015] A hair extension according to the invention comprises a
extension hair portion including a plurality of strands of
extension hairs and a binding portion for tying one ends of the
extension hairs into one, wherein the binding portion comprises a
sheet binding portion in which two sheets of synthetic resin
overlapped with the one ends in-between are molten and glued so as
to fix the one ends into one body.
[0016] The synthetic resin sheet is preferably a polyurethane
sheet.
[0017] In cases, the extension hair portion comprises a first
sub-extension hair portion and a second sub-extension hair portion
disposed in layers together with the first sub-extension hair
portion, and the sheet binding portion is formed by melting and
gluing with neighboring ones a first polyurethane sheet disposed at
an outer side of the first sub-extension hair portion opposite to
the second sub-extension hair portion, a second polyurethane sheet
disposed between the first and second sub-extension hair portions,
and a third polyurethane sheet disposed at an outer side of the
second sub-extension hair portion opposite to the first
sub-extension hair portion.
[0018] In some cases, the extension hair portion comprises a first
sub-extension hair portion, a second sub-extension hair portion
disposed in layers together with the first sub-extension hair
portion, a third sub-extension hair portion disposed in layers on
the second sub-extension hair portion opposite to the first
sub-extension hair portion, and the sheet binding portion is formed
by melting and gluing with neighboring ones a first polyurethane
sheet disposed at an outer side of the first sub-extension hair
portion opposite to the second sub-extension hair portion, a second
polyurethane sheet disposed between the first and second
sub-extension hair portions, a third polyurethane sheet disposed
between the second and third sub-extension hair portions, and a
fourth polyurethane sheet disposed at an outer side of the third
sub-extension hair portion opposite to the second sub-extension
hair portion.
[0019] The synthetic resin is preferably a polyurethane sheet with
thickness of 0.06.about.1.00 mm.
[0020] In the extension hair portion, the extension hairs are
preferably disposed in a plane.
[0021] In each of the first through third sub-extension hair
portions, the extension hairs are disposed in a plane and there are
1 to 5 strands in the direction of thickness.
[0022] In the sheet binding portion are preferably formed holes
with intervals.
[0023] A process for manufacturing a hair extension according to
the invention comprises: a first step for disposing two synthetic
resin sheets in layers with one ends of a first sub-extension hair
portion; and a first step for melt-and-gluing the one ends of the
first sub-extension hair portion between the two synthetic resin
sheets by melt-and-gluing the two synthetic resin sheets while
pressing the two synthetic resin sheets toward each other.
[0024] The synthetic resin sheet is a polyurethane sheet, and the
process for manufacturing may further comprise: a second step for
disposing additional polyurethane sheet on a portion in which a
second sub-extension hair portion is stacked in layers on the first
sub-extension hair portion and one ends of the second sub-extension
hair portion are overlapped on the molten and glued portion of the
two polyurethane sheets; and a second step for melt-and-gluing the
additional polyurethane sheet by heating while pressing to the
molten and glued portion and fixing the second sub-extension hair
portion between the additional polyurethane sheet and a portion
where the two polyurethane sheets are molten and glued.
[0025] Also, the process for manufacturing may further comprise: a
third step for disposing a newly added polyurethane sheet on a
portion in which a third sub-extension hair portion is stacked in
layers on the second sub-extension hair portion and one ends of the
third sub-extension hair portion are overlapped on the molten and
glued portion of the three polyurethane sheets; and a third step
for melt-and-gluing the newly added polyurethane sheet by heating
while pressing to the molten and glued portion and fixing the third
sub-extension hair portion between the newly added polyurethane
sheet and a portion where the three polyurethane sheets are molten
and glued.
[0026] The thickness of the synthetic resin is preferably
0.06.about.1.00 mm.
[0027] In each of the first through third sub-extension hair
portions, the extension hairs are disposed in a plane and there are
1 to 5 strands in the direction of thickness.
[0028] The synthetic resin sheet is polyurethane sheet, and
preferably the temperature of the polyurethane sheet in the first
step for melt-and-gluing is 150.about.160 degrees in Celsius, and
the pressure is 30.about.50 kg per centimeter squared.
[0029] The process may further comprise a step for forming a
plurality of holes with intervals where the synthetic resin sheets
are molten and glued.
BRIEF DESCRIPTION OF DRAWINGS
[0030] FIG. 1 is a perspective view showing an example of hair
extension according to the invention;
[0031] FIG. 2 is a partially exploded cross-sectional view for
explaining three-layered extension hair portion;
[0032] FIG. 3 is a partially exploded cross-sectional view for
explaining two-layered extension hair portion;
[0033] FIG. 4 is a partially exploded cross-sectional view for
explaining single-layered extension hair portion;
[0034] FIG. 5 is a flow chart for explaining a process for
manufacturing hair extension according to the invention;
[0035] FIG. 6 is a plan view showing a state of extension hairs
fixed to a fixing plate in a layer;
[0036] FIG. 7 is a plan view showing a state of disposing a first
polyurethane sheet and a first sub-extension hair portion with
extension hairs fixed on a fixing plate on a melt-and-gluing
device;
[0037] FIG. 8 is a plan view showing a state of overlapping a
second polyurethane sheet on an end of the first sub-extension hair
portion;
[0038] FIG. 9 is a left side view for showing a state of heating
the first and second polyurethane sheets while pressing with
press-heater in the state of FIG. 8;
[0039] FIG. 10 is a plan view of a state showing overlapping a
second sub-extension hair portion and a third polyurethane sheet
thereon after melt-and-gluing the two sheets of FIG. 9;
[0040] FIG. 11 is a left side view for showing a state of heating
the third polyurethane sheet while pressing downward with
press-heater in the state of FIG. 10;
[0041] FIG. 12 is a plan view of a state showing overlapping a
third sub-extension hair portion and a fourth polyurethane sheet
thereon after melt-and-gluing the two sheets of FIG. 11;
[0042] FIG. 13 is a left side view for showing a state of heating
the fourth polyurethane sheet while pressing downward with
press-heater in the state of FIG. 12;
[0043] FIG. 14 is a plan view showing a hair extension before
boring a hole made by FIG. 13;
[0044] FIG. 15 is a diagram showing another example of synthetic
resin sheet which can be used in the invention;
[0045] FIG. 16 is a perspective view showing a state with user's
hair taken out through a hole;
[0046] FIG. 17 is a perspective view showing a state with an
engaging ring inserted in the hair taken out through two
neighboring holes;
[0047] FIG. 18 is a perspective view showing a state of pressing
the engaging ring; and
[0048] FIG. 19 is a perspective view showing a state of fixing the
hair extension according to the invention to the user's hair.
DETAILED DESCRIPTION OF EMBODIMENTS
[0049] Below, preferable embodiments of the invention are described
in detail referring to the figures.
[0050] FIG. 1 is a perspective view showing an example of hair
extension according to the invention, FIG. 2 is a partially
exploded cross-sectional view for explaining three-layered
extension hair portion, FIG. 3 is a partially exploded
cross-sectional view for explaining two-layered extension hair
portion, and FIG. 4 is a partially exploded cross-sectional view
for explaining single-layered extension hair portion.
[0051] As shown in FIGS. 1-4, the hair extension 100 according to
the invention comprises a extension hair portion 110 having a
plurality of extension hairs 112 disposed in a layer and a sheet
binding portion 130 for connecting and fixing one end of the
extension hairs 112 integrally. Thus the one end of the extension
hair portion 110 is fixed to the sheet binding portion 130. In the
invention, preferably human hairs are used for the extension hairs
112 forming the extension hair portion 110.
[0052] The sheet binding portion 130 is formed by melt-and-gluing
the band-shaped polyurethane sheets together with the one ends of
the extension hairs 112 with ends aligned, that is, the one end of
the extension hair portion 110 in between, which fixes the one ends
of the extension hairs 112 integrally. For polyurethane sheet may
be used a polyurethane solution including
29.about.31:10.about.20:50.about.60 in weight of polyurethane,
methyl ethyl ketone (MEK, CAS No. 78-93-3) and dimethylformamide
(DMF, CAS No. 68-12-2), which is dried or baked to be
0.06.about.0.1 mm thick in an oven and the like. The drying or
baking temperature is preferably about 70.about.90 degrees, most
preferably 80 degrees in Celsius. Of course, instead of such a
polyurethane sheet, other synthetic resin sheet may be used.
[0053] In a case of melt-and-gluing using polyurethane sheets,
polyurethane sheet that is thinner than 0.06 mm is too little to be
molten, such that it tends to make melt-and-gluing erroneous and
the melt-and-gluing process of the two sheets may be infested with
deformation.
[0054] And when the thickness of polyurethane sheet is larger than
0.1 mm, it takes longer for heat to be delivered to inside and the
temperature of outer surface where the pressing heater touches
rises too high, reducing work efficiency.
[0055] The thickness of 0.08 mm or 0.09 mm of polyurethane sheet
gives minimized erroneous melt-and-gluing, less deformation, and
good workability.
[0056] That is, for the polyurethane sheet used for manufacturing
the hair extension 100 according to the invention, 0.06.about.0.1
mm thick ones are good to be used, and 0.08.about.0.09 mm thick
ones are more preferable.
[0057] A preferable dimension (width.times.length) of polyurethane
sheet is 1.2 cm.times.9 cm. However, for a larger hair extension, a
2 cm.times.15 cm one may be used. In cases, ones smaller than 1.2
cm.times.9 cm may be also used.
[0058] That is, the size of polyurethane sheet may be changed
according to the size of the hair extension 100.
[0059] If pressing together and heating the two polyurethane sheets
in order to form sheet binding portion 130, the molten portions
smears into the extension hairs 112 and encloses one end, and then
encounters another molten portions at the other side, to be
glued.
[0060] If cooling down the molten portions, the portions get
solidified and hard. Thus the one end of the extension hair portion
110 is fixed strongly between the two neighboring polyurethane
sheets.
[0061] As shown, in the sheet binding portion 130 are formed a
plurality of holes 130a with intervals. The holes 130a are for
attaching the hair extension 100 according to the invention to the
user's hairs, the diameter of which may be about 1.5 mm.about.2.0
mm, which may be adjusted.
[0062] Referring to FIGS. 2-4, the structure of the hair extension
100 according to the invention is described in more detail.
[0063] Referring to FIG. 2, the extension hair portion 110 of the
hair extension 100 according to the invention preferably comprises
a first sub-extension hair 110a, a second sub-extension hair 110b
disposed in layer on the first sub-extension hair 110a, and a third
sub-extension hair 110c disposed in layer on the second
sub-extension hair 110b opposite to the first sub-extension hair
110a. Therefore, the extension hair portion 110 has three layers,
and each of the first sub-extension hair 110a through the third
sub-extension hair 110c has preferably 1-5 strands of extension
hairs 112 in a direction of thickness.
[0064] In FIG. 2, in an outer side of one end of the first
sub-extension hair 110a is disposed a first polyurethane sheet 131,
and between one end of the first sub-extension hair 110a and one
end of the second sub-extension hair 110b is disposed a second
polyurethane sheet 132. The first polyurethane sheet 131 and the
second polyurethane sheet 132 are melt-and-glued with each other,
and each of them are also glued to one ends of the extension hairs
112 forming the first sub-extension hair 110a, fixing the one
ends.
[0065] Also, between the second sub-extension hair 110b and the
third sub-extension hair 110c is disposed a third polyurethane
sheet 133. The third polyurethane sheet 133 and the second
polyurethane sheet 132 are melt-and-glued with each other, and fix
one end of the second sub-extension hair 110b between the second
polyurethane sheet 132 and the third polyurethane sheet 133 to the
sheet binding portion 130.
[0066] In the outer side of the third sub-extension hair 110c is
disposed a fourth polyurethane sheet 134. The fourth polyurethane
sheet 134 and the third polyurethane sheet 133 are melt-and-glued
with each other, and fix one end of the third sub-extension hair
110c between the third polyurethane sheet 133 and the fourth
polyurethane sheet 134 to the sheet binding portion 130.
[0067] In the embodiment of FIG. 2, the first sub-extension hair
110a through the third sub-extension hair 110c are disposed in
layers overlapping with each of the second polyurethane sheet 132
and the third polyurethane sheet 133 between neighboring ones.
[0068] Also, the first polyurethane sheet 131 through the fourth
polyurethane sheet 134 are disposed in layers overlapping each of
one ends of the first sub-extension hair 110a through the third
sub-extension hair 110c between neighboring ones, and neighboring
ones are melt-and-glued respectively.
[0069] In FIG. 3, the extension hair portion 110 is formed with the
first sub-extension hair 110a and the second sub-extension hair
110b as two layers, the density of which is lower than in FIG.
2.
[0070] The hair extension 100 shown in FIG. 3 are obtained by
fixing one end of the first sub-extension hair 110a and one end of
the second sub-extension hair 110b in layers using three
polyurethane sheets, the first polyurethane sheet 131 through third
polyurethane sheet 133, which is the same as what is obtained in
FIG. 2 with the third sub-extension hair 110c not attached to the
sheet binding portion 130 through the fourth polyurethane sheet
134.
[0071] Describing in more detail referring to FIG. 3, the extension
hair portion 110 comprises the first sub-extension hair 110a and
the second sub-extension hair 110b disposed in layers with the
first sub-extension hair 110a. And the sheet binding portion 130 is
melt-and-glued with neighboring ones in which the first
polyurethane sheet 131 disposed in the outer side of the first
sub-extension hair 110a, the second polyurethane sheet 132 disposed
between the first sub-extension hair 110a and the second
sub-extension hair 110b, and the third polyurethane sheet 133
disposed in the outer side of the second sub-extension hair 110b
overlapped in layers.
[0072] When density of each sub-extension hairs is same, as shown
in FIG. 3, the density of extension hairs 112 is about 2/3 compared
to one in FIG. 2.
[0073] Referring to FIG. 4, in cases, the hair extension 100
according to the invention may comprise only the first
sub-extension hair 110a, and the first polyurethane sheet 131 and
the second polyurethane sheet 132, which are melt-and-glued with
each other on both sides of the first sub-extension hair 110a and
one end of the first sub-extension hair 110a and form the sheet
binding portion 130. In such a case, the extension hair portion 110
of the hair extension 100 according to the invention includes the
first sub-extension hair 110a only, and is formed in a single
layer. The density of extension hairs 112 as shown in FIG. 4 is
about 1/3 compared to the one in FIG. 2.
[0074] It is also possible that in the hair extension 100 according
to the invention the extension hair portion 110 comprises more than
four layers of sub-extension hairs.
[0075] That is, in the hair extension 100 according to the
invention, it is easy to adjust the density of the extension hairs
112.
[0076] FIG. 5 is a flow chart for explaining a process for
manufacturing hair extension according to the invention, and FIGS.
6-13 are drawings showing major processes of manufacturing hair
extension according to the invention.
[0077] In the manufacturing of the hair extension 100 according to
the invention, a fixing plate 150 as shown in FIG. 6 is used. The
fixing plate 150 comprises a band-shaped board 152 and a
band-shaped Velcro tape 154 attached to the board 152.
[0078] Referring to FIGS. 5 and 6, first, the extension hairs 112
are arranged and fixed in layer on the Velcro tape 154 of the
fixing plate 150, in which the top ends of the extension hairs 112
are aligned (S1).
[0079] Each of extension hairs 112 is attached to the Velcro tape
154 by a thickness of 1-5 strands, preferably 2-4 strands. As the
number of the extension hairs 112 disposed in a direction of
thickness increases, the density of sub-extension hairs increases,
but because the molten portion of polyurethane sheet is too thick
to smear into the thick extension hairs 112, the glued area is
reduced, both of the polyurethane sheets are hard to melt-and-glue
to each other, and the fixing force of each extension hair 112 is
lowered, so as to make defect rate increase.
[0080] In order to manufacture a hair extension 100 having three
layers of the first sub-extension hair 110a through the third
sub-extension hair 110c as shown in FIG. 2, three fixing plates
150, to which extension hairs are fixed, are needed, two of those
in FIG. 3, or one of those in FIG. 4.
[0081] That is, those shown in FIG. 6 must be prepared by many
according to the number of hair extension 100 to make, the number
of layers, etc.
[0082] Next, as shown in FIG. 7 the first polyurethane sheet 131 is
put on a supporting board 162 of a melt-and-gluing device 160 (S2),
and on top of that the extension hairs 112 fixed in layer on the
fixing plate 150, that is, one end of the first sub-extension hair
110a is disposed and overlapped on the first polyurethane sheet 131
(S3).
[0083] And then, as shown in FIG. 8, the second polyurethane sheet
132 is overlapped with the first polyurethane sheet 131 by
disposing the second polyurethane sheet 132 on one end of the first
sub-extension hair 110a. Thus the one end of the first
sub-extension hair 110a is disposed between the first polyurethane
sheet 131 and the second polyurethane sheet 132.
[0084] It is preferable for the first polyurethane sheet 131 and
the second polyurethane sheet 132 to be overlapped completely on
top of each other, but in order to show the top and bottom sheets
in the figure, the edges of the two sheets were shown misaligned.
This holds true for the third polyurethane sheet 133 and the fourth
polyurethane sheet 134 below.
[0085] In this state, as shown in FIG. 9, the first polyurethane
sheet 131 and the second polyurethane sheet 132 are melt-and-glued
together by pressing the second polyurethane sheet 132 toward the
first polyurethane sheet 131 and heating them with a pressing
heater 164 of the melt-and-gluing device 160.
[0086] The molten portions of the first polyurethane sheet 131 and
the second polyurethane sheet 132 molten by heating smear into the
extension hairs 112 between the two sheets under pressure by
pressing together, are melt-and-glued together, and also enclose
the one ends of the extension hairs 112 and fix the extension hairs
112.
[0087] If stopping heating and pressing the two sheets through the
pressing heater 164 by lifting up the pressing heater 164, the
molten portion of the two sheets are cooled down and coagulated.
Thus the two sheets keep the solidly melt-and-glued state, and fix
the extension hairs 112.
[0088] By the above, the sheet binding portion 130 which fixes one
end of the first sub-extension hair 110a first to between the two
sheets using melt-and-gluing is formed on the one end of the first
sub-extension hair 110a (S4). In this case, the extension hair
portion 110 comprises the first sub-extension hair 110a only. After
the first melt-and-gluing step is done, the fixing plate 150 is
detached from the first sub-extension hair 110a.
[0089] Here the heating temperature of the first and second
polyurethane sheets 131,132 is about 150.about.160 degrees in
Celsius, the pressure about 30.about.50 kg/cm.sup.2, and the
pressing time about 50.about.70 sec.
[0090] The thickness and dimension of polyurethane sheet have been
discussed above already. Instead of polyurethane sheet other types
of synthetic resin sheets can be used, which has preferably
relatively low melting temperature of 140.about.200 degrees in
Celsius, good gluing power, and little deformation in cooling
down.
[0091] After the sheet binding portion 130 is formed by
melt-and-gluing the two sheets, as shown in FIGS. 10 and 11, the
second sub-extension hair 110b is overlapped in layer on the first
sub-extension hair 110a, and the one end is overlapped in layer on
the sheet binding portion 130.
[0092] And, on one end of the second sub-extension hair 110b is
disposed additional third polyurethane sheet 133, and the third
polyurethane sheet 133 is heated and pressed toward the sheet
binding portion 130 with the pressing heater 164, melt-and-gluing
for a second time. Thus, one end of the second sub-extension hair
110b is fixed between the additionally added third polyurethane
sheet 133 and the sheet binding portion 130 formed by the two
melt-and-glued polyurethane sheets (S5).
[0093] After the third polyurethane sheet 133 is melt-and-glued,
the sheet binding portion 130 becomes a sheet binding portion 130
by three sheets. In such a case, the extension hair portion 110
comprises the first sub-extension hair 110a and the second
sub-extension hair 110b overlapped with the first sub-extension
hair 110a.
[0094] After the second melt-and-gluing step is done, the fixing
plate 150 is detached from the second sub-extension hair 110b.
[0095] Then, as shown in FIGS. 12 and 13, in a state of stacking
the third sub-extension hair 110c on the second sub-extension hair
110b in layer, one end of the third sub-extension hair 110c is
overlapped on the sheet binding portion 130 which is where the
three polyurethane sheets are melt-and-glued, and a the fourth
polyurethane sheet 134 is further disposed on top of that. By this,
the one end of the third sub-extension hair 110c is disposed
between the sheet binding portion 130 to which three polyurethane
sheets are melt-and-glued and the new fourth polyurethane sheet
134.
[0096] And, by moving the pressing heater 164 downward, the fourth
polyurethane sheet 134 is pressed down toward the sheet binding
portion 130 to which three sheets are melt-and-glued and heated for
a third melt-and-gluing. Thus the one end of the third
sub-extension hair 110c is fixed solidly between the new fourth
polyurethane sheet 134 and the portion where the three sheets are
melt-and-glued (S6). By this, the third sub-extension hair 110c is
also fixed to the sheet binding portion 130.
[0097] Thus, the hair extension 100 according to the embodiment
includes the sheet binding portion 130 by four sheets each fixing
the one ends of the first sub-extension hair 110a through the third
sub-extension hair 110c inserted between the neighboring
melt-and-glued portions while the four sheets are overlapped.
[0098] After finishing the sheet binding portion 130, if the edges
of the sheet binding portion 130 are not aligned top to bottom, the
edges of all the polyurethane sheets get aligned by cutting the
edges.
[0099] FIG. 14 is a plan view showing a hair extension manufactured
by the above process before boring holes 130a are formed as
described in FIG. 1.
[0100] The first sub-extension hair 110a through the third
sub-extension hair 110c are preferably formed with a same
width.
[0101] If the third melt-and-gluing step is done, the fixing plate
150 is detached from the third sub-extension hair 110c.
[0102] Then, as shown in FIG. 1, in the sheet binding portion 130
are bored a plurality of holes 130a with intervals (S7). The holes
130a are for fixing the hair extension 100 to the user's hairs by
inserting and passing the user's hairs through and fixing the
user's hairs passing the two or more holes 130a with an engaging
ring, etc.
[0103] After boring the holes 130a, the remaining debris or other
material sticking around or to the edge of sheets are removed for
finishing.
[0104] By doing as in the above, the hair extension 100 according
to the invention is manufactured, which includes the extension hair
portion 110 in which the sub-extension hairs are disposed in three
layers.
[0105] FIG. 15 is a diagram showing another example of synthetic
resin sheet which can be used in the invention, and (a) is a plan
view, and (b) is a side view in a folded state.
[0106] In cases, for the synthetic resin sheet 130b such as
polyurethane sheets for forming the sheet binding portion, instead
of the two sheets used in the previous embodiment, can be used a
sheet which is foldable as in FIG. 15(b) about the folding line
130c formed along central portion as indicated in FIG. 15(a).
[0107] Referring to FIGS. 16-19, a process for attaching hair
extension according to the invention to the user's hairs is
described.
[0108] FIG. 16 is a perspective view showing a state with user's
hair taken out through a hole, FIG. 17 is a perspective view
showing a state with an engaging ring inserted in the hair taken
out through two neighboring holes, FIG. 18 is a perspective view
showing a state of pressing the engaging ring, and FIG. 19 is a
perspective view showing a state of fixing the hair extension
according to the invention to the user's hair.
[0109] Check the position where to attach the hair extension 100 in
the user's head 10, and taking out the user's hairs 12 which are in
positions corresponding to each holes 130a through the holes 130a
using a hooking device 170 having a hook at an end as shown in FIG.
16.
[0110] Then, pass the hairs 12 taken-out through the holes 130a
through an engaging ring 180 as in FIG. 17, and move the engaging
ring 180 to the vicinity of the sheet binding portion 130. There,
do not push the engaging ring 180 to the sheet binding portion 130,
but give some space such that the sheet binding portion 130 moves
around and the hairs 12 are not pulled tightly. As such, the user
does not feel uncomfortable with the hair extension 100 attached
and can move freely.
[0111] After that, as shown in FIG. 18, squeeze the engaging ring
180 using a pliers 190 and fix the engaging ring 180 at the user's
hairs 12. If eight holes 130a are formed in the sheet binding
portion 130, four engaging rings 180 are used.
[0112] FIG. 19 shows the hair extension 100 according to the
invention attached to the user's hairs 12 through the above
process.
[0113] In order to detach the hair extension 100 according to the
invention after using them attached to the user's hairs 12 as in
FIG. 19, open the squeezed portion of the engaging ring 180 using a
tool and remove the engaging ring 180 from the user's hairs 12.
Then, the hair extension 100 is detached from the user's hairs 12
by releasing the hairs 12 from the holes 130a.
[0114] And according to thermal analysis of human hairs, the rare
elements and protein in hairs begin to burn at 200 degrees in
Celsius, and if heating them up slowly (temperature increasing
rate: about 5 degrees/min in Celsius from room temperature to 500
degrees in Celsius at which most of hair protein gets carbonized,
the total weight of hairs gets reduced by 75% of the initial
weight.
[0115] Considering the above, for the synthetic resin sheets
applied to the invention is suitable the polyurethane sheet as
described above, but one person skilled in the art belonging to the
invention may recognize to use other synthetic resin if they are
melt-and-glued together below 200 degrees in Celsius, since they do
not give a large thermal damage to extension hairs.
EFFECTS OF INVENTION
[0116] The hair extension according to the invention enables to fix
extension hairs to a synthetic resin sheet such as thin and light
polyurethane sheet in a high density.
[0117] The hair extension according to the invention has the
extension hairs spread out widely in layer, but since it has a
sheet binding portion that can form holes, it can be attached to
and detached from the user's hairs rapidly and easily using the
engaging rings.
[0118] The hair extension according to the invention enables the
user to move freely because the degree of fixing to the user's
hairs can be adjusted and it is fixed to the user's hairs
indirectly.
[0119] The hair extension according to the invention has extension
hairs that is rarely tangled or fallen off and therefore may be
used many times, because the extension hairs are attached solidly
by melt-and-gluing to resin sheets such as polyurethane sheet.
[0120] The hair extension according to the invention may be made
with the density of extension hairs adjusted variously according to
the usage.
[0121] The hair extension according to the invention does not
produce rough surfaces since the extension hairs do not have to be
tied as in sewing.
INDUSTRIAL APPLICATIONS
[0122] The hair extension according to the invention may be used
for having hairstyles of excellent hair quality, affluent hair, or
long hair by extending hairs of the user.
[0123] The process for manufacturing hair extension according to
the invention may be used for producing hair extension of good
quality to be used repeatedly.
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