U.S. patent application number 11/813086 was filed with the patent office on 2008-02-07 for three-dimensional cross-linked foam for uppers of shoes.
Invention is credited to Jang Won Park.
Application Number | 20080028635 11/813086 |
Document ID | / |
Family ID | 36615069 |
Filed Date | 2008-02-07 |
United States Patent
Application |
20080028635 |
Kind Code |
A1 |
Park; Jang Won |
February 7, 2008 |
Three-Dimensional Cross-Linked Foam for Uppers of Shoes
Abstract
The present invention provides a three-dimensional cross-linked
foam for uppers of shoes that comprises a cross-linked foam body
having a shape corresponding to a last; at least one inner cavity
structure formed in the cross-linked foam body, the inner cavity
structure defined by an internally formed surface of the
cross-linked foam body; and filler injected into the inner cavity
structure. The cross-lined foam of the present invention can more
effectively protect the feet and increase a fitting feeling and a
supporting power without additional components added to the
cross-linked foam. The cross-linked foam of the present invention
may further have an air ventilation and waterproof function.
Inventors: |
Park; Jang Won; (Busan,
KR) |
Correspondence
Address: |
BIRCH STEWART KOLASCH & BIRCH
PO BOX 747
FALLS CHURCH
VA
22040-0747
US
|
Family ID: |
36615069 |
Appl. No.: |
11/813086 |
Filed: |
April 21, 2005 |
PCT Filed: |
April 21, 2005 |
PCT NO: |
PCT/KR05/01151 |
371 Date: |
June 28, 2007 |
Current U.S.
Class: |
36/3R ;
36/45 |
Current CPC
Class: |
B29D 35/04 20130101;
B29C 44/08 20130101; A43B 7/08 20130101; A43B 23/042 20130101; B29D
35/0054 20130101; B29C 44/02 20130101; B29D 35/126 20130101; B29D
35/146 20130101; A43D 11/00 20130101 |
Class at
Publication: |
036/003.00R ;
036/045 |
International
Class: |
A43B 7/06 20060101
A43B007/06; A43B 23/00 20060101 A43B023/00 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 31, 2004 |
KR |
10-2004-0117865 |
Claims
1-24. (canceled)
25. A three-dimensional cross-linked foam for uppers of shoes,
comprising: a cross-linked foam body having a shape corresponding
to a last; and at least one inner cavity structure formed in the
cross-linked foam body, the inner cavity structure defined by an
internally formed surface of the cross-linked foam body.
26. The cross-linked foam according to claim 24, further comprises
an air passage connected to the at least one inner cavity
structure.
27. The cross-linked foam according to claim 24, wherein the at
least one inner cavity structure is filled with gas.
28. The cross-linked foam according to claim 24, wherein unevenness
is formed on the cross-linked foam body.
29. The cross-linked foam according to claim 24, wherein plural
inner cavity structures are formed in the cross-linked foam
body.
30. The cross-linked foam according to claim 29, wherein all or
some of the plural inner cavity structures are connected to each
other.
31. The cross-linked foam according to claim 30, further comprises
an air passage connected to at least one of the plural inner cavity
structures.
32. The cross-linked foam according to claim 30, wherein at least
one of the plural inner cavity structures is filled with gas.
33. The cross-linked foam according to claim 29, wherein the plural
inner cavity structures form groups consisting of connected inner
cavity structures.
34. The cross-linked foam according to claim 33, further comprises
an air passage connected to at least one of the plural inner cavity
structures.
35. The cross-linked foam according to claim 33, wherein at least
one of the plural inner cavity structures is filled with gas.
36. A three-dimensional cross-linked foam for uppers of shoes,
comprising: a cross-linked foam body having a shape corresponding
to a last; at least one inner cavity structure formed in the
cross-linked foam body, the inner cavity structure defined by an
internally formed surface of the cross-linked foam body; and filler
introduced into the inner cavity structure.
37. The cross-linked foam according to claim 36, wherein unevenness
is formed on the cross-linked foam body.
38. The cross-linked foam according to claim 36, wherein the filler
includes at least one material selected from gas, liquid and same
material as or different material from the cross-linked foam
body.
39. The cross-linked foam according to claim 38, wherein the filler
is introduced into a housing that is put into close contact with
the internally formed surface.
40. The cross-linked foam according to claim 36, wherein plural
inner cavity structures are formed in the cross-linked foam body
and at least one of the plural inner cavity structures is filled
with the filler.
41. The cross-linked foam according to claim 40, wherein the filler
includes at least one material selected from gas, liquid and same
material as or different material from the cross-linked foam
body.
42. The cross-linked foam according to claim 41, wherein the filler
is introduced into a housing that is put into close contact with
the internally formed surface.
43. The cross-linked foam according to claim 40, further comprises
an air passage connected to at least one of the plural inner cavity
structures.
44. The cross-linked foam according to claim 43, wherein the filler
includes at least one material selected from gas, liquid and same
material as or different material from the cross-linked foam
body.
45. The cross-linked foam according to claim 44, wherein the filler
is introduced into a housing that is put into close contact with
the internally formed surface.
46. The cross-linked foam according to claim 40, wherein all or
some of the inner cavity structures are connected to each
other.
47. The cross-linked foam according to claim 46, wherein the filler
includes at least one material selected from gas, liquid and same
material as or different material from the cross-linked foam
body.
48. The cross-linked foam according to claim 47, wherein the filler
is introduced into a housing that is put into close contact with
the internally formed surface.
49. The cross-linked foam according to claim 46, further comprises
an air passage connected to at least one of the plural inner cavity
structures.
50. The cross-linked foam according to claim 40, wherein the plural
inner cavity structures form groups consisting of connected inner
cavity structures.
51. The cross-linked foam according to claim 50, wherein the filler
includes at least one material selected from gas, liquid and same
material as or different material from the cross-linked foam
body.
52. The cross-linked foam according to claim 51, wherein the filler
is introduced into a housing that is put into close contact with
the internally formed surface.
53. The cross-inked foam according to claim 50, further comprises
an air passage connected to at least one of the plural inner cavity
structures.
54. A three-dimensional cross-linked foam for uppers of shoes,
comprising: a cross-linked foam body having a shape corresponding
to a last.
55. The cross-linked foam according to claim 54, wherein at least
one air passage is formed in the cross-linked foam body.
56. The cross-linked foam according to claim 54, wherein unevenness
is formed on the cross-linked foam body.
Description
TECHNICAL FIELD
[0001] The present invention relates to a cross-linked foam, and
more specifically a three-dimensional cross-linked foam for uppers
of shoes that has a shape corresponding to a last and has at least
one inner cavity structure therein.
BACKGROUND ART
[0002] The shoes that we usually wear for protecting the feet from
the external circumstance mainly comprise soles and uppers. The
uppers of the shoes directly contact the feet and thus increases a
feeling of unity. Besides, the uppers play a primary role in
protecting the feet from an external impact applied to the
feet.
[0003] The uppers are usually formed using a last 10 that has a
three-dimensional shape corresponding to completed uppers as shown
in FIGS. 13 to 14. Because the last 10 has a three-dimensional
shape and the raw material for the uppers are planar, a measurement
of each portion of the last 10 must be taken and then converted to
a measurement that can be applied to the planar raw material for
the uppers such as cloth, leather and various resins, etc. That is,
the last 10 has a three-dimensional measurement as shown in the
figures in alphabet "a","b", "c", "d" and "e" and these measurement
must be converted to a planar measurement that can be applied to
the raw material for the uppers. The raw material is cut according
to the converted measurement and then sewed or attached together.
The sewed or attached material is put into close contact with the
outer surface of the last 10 and then undergoes a heating and an
ageing processes to obtain a completed uppers. The completed uppers
acquired by the above-mentioned method have following
disadvantages.
[0004] Firstly, many components of the completed uppers basically
has a thin planar shape and is formed of soft material, a stability
of a shape and a dimension is low compared with the soles of the
shoes that is formed by a molding die. In addition, once the planar
raw materials are transformed into a three-dimensional shape, it is
difficult to keep the completed uppers in a three-dimensional
shape.
[0005] Accordingly, this phenomenon is likely to happen to the
uppers of the shoes when the shoes is repeatedly used for a certain
period of time. To overcome this problem, an injection-molded
material having a superior forming property and shape-maintenance
property has been widely used for a specific component of the shoe
at a certain portion of the uppers in the field. According to this
method, the forming property and the shape-maintenance property of
the uppers are greatly improved but a fitting feeling of the shoes
may be lowered owing to the injection-molded material having a
higher hardness than the cloth and the leather. Accordingly, the
injection-molded material is limitedly used for a certain portion
of the uppers or for shoes designed for a special purpose.
[0006] Secondly, because the uppers must primarily protect the feet
from the external impact, it should have a supporting property and
a good fitting. However, it has been very difficult for the uppers
to satisfy those required properties because the uppers of the
related art has been usually made of the thin, planar and soft
materials. In an alternative to overcome the problem, various
shock-absorbing material or protector may be put into the uppers or
attached to the uppers during a sewing process. However, an
applicable range of this method is very narrow considering that the
upper is formed of thin planar material and has a smaller thickness
than the soles of the shoe. Moreover, if several shock-absorbing
materials having a relatively big volume are inserted or attached
to a certain portion of the uppers, the fitting feeling between the
uppers and the feet becomes bad and a naturally curved appearance
of the shoes also becomes bad even though a shock-absorbing
property of the certain portion of the uppers is improved.
[0007] Thirdly, recent customer has a preference to shoes that has
a function of an air circulation and a waterproof to take a fresh
air into the shoes and discharge sweat out of the shoes. However,
it is not easy to give such properties to the uppers of the related
art formed of the soft material such as leather. There are two
different methods to provide the uppers with the function of air
ventilation and waterproof. That is, a film or sheet type material
for air ventilation and waterproof may be additionally attached to
the uppers or a surface of the uppers may be chemically treated in
order to fulfill the function of air ventilation and
waterproof.
[0008] In case of the former, the film or the sheet having the
function of air ventilation and waterproof is attached to a surface
of the uppers or additional built-in uppers formed of the film or
the sheet having the function of air ventilation and waterproof are
formed in a shape of the sewed uppers and then put into the sewed
uppers. However, this method makes the total manufacturing process
of the shoes complex and accordingly increases the manufacturing
cost.
[0009] In case of the latter, though the total process to treat the
surface of the uppers chemically is relatively simple compared with
the former, an effect of the air ventilation and waterproof is
relatively poor considering that the chemical treatment is done
only on the surface of the uppers.
DISCLOSURE OF INVENTION
Technical Problem
[0010] 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 three-dimensional
cross-linked foam for uppers of shoes that can maintain a dimension
and a shape for a long time because the cross-linked foam is formed
according to a shape of a last.
[0011] Another object of the present invention is to provide a
three-dimensional cross-linked foam for uppers of shoes that can
increase fitting feeling and supporting property of the shoes
without attaching additional components to the uppers.
[0012] Another object of the present invention is to provide a
three-dimensional cross-linked foam for uppers of shoes that can
naturally circulate air between the inside and outside of the shoes
and have a proper function of waterproof.
[0013] Another object of the present invention is to provide a
three-dimensional cross-linked foam for uppers of shoes that can
differentiate a hardness and design of each portion of the
shoes.
Technical Solution
[0014] To achieve these and other advantages and in accordance with
the purpose of the present invention, as embodied and broadly
described, a three-dimensional cross-linked foam for uppers of
shoes comprises a cross-linked foam body having a shape
corresponding to a last; and at least one inner cavity structure
formed in the cross-linked foam body, the inner cavity structure
defined by an internally formed surface of the cross-linked foam
body.
[0015] In the above, plural inner cavity structures may be formed
in the cross-linked foam body.
[0016] In the above, all or some of the plural inner cavity
structures may be connected to each other.
[0017] In the above, the plural inner cavity structures may form
groups consisting of connected inner cavity structures.
[0018] In the above, cross-linked foam may further comprise an air
passage connected to at least one of the plural inner cavity
structures.
[0019] In the above, at least one of the plural inner cavity
structures may be filled with gas.
[0020] In the above, unevenness may be formed on the cross-linked
foam body.
[0021] In another aspect, a three-dimensional cross-linked foam for
uppers of shoes comprises a cross-linked foam body having a shape
corresponding to a last; at least one inner cavity structure formed
in the cross-linked foam body, the inner cavity structure defined
by an internally formed surface of the cross-linked foam body; and
filler introduced into the inner cavity structure.
[0022] In the above, plural inner cavity structures are formed in
the cross-linked foam body and all of the plural inner cavity
structures are filled with the filler.
[0023] In the above, plural inner cavity structures may be formed
in the cross-linked foam body and at least one of the plural inner
cavity structures is filled with the filler.
[0024] In the above, all or some of the plural inner cavity
structures may be connected to each other.
[0025] In the above, the plural inner cavity structures may form
groups consisting of connected inner cavity structures.
[0026] In the above, cross-linked foam may further comprise an air
passage connected to at least one of the plural inner cavity
structures.
[0027] In the above, the filler may include at least one material
selected from gas, liquid and same material as or different
material from the cross-linked foam body.
[0028] In the above, the filler may be introduced into a housing
that is put into close contact with the internally formed
surface.
[0029] In the above, unevenness may be formed on the cross-linked
foam body.
[0030] In another aspect, a three-dimensional cross-linked foam for
uppers of shoes comprises a cross-linked foam body having a shape
corresponding to a last.
[0031] In the above, at least one air passage may be formed in the
cross-linked foam body.
[0032] In the above, unevenness may be formed on the cross-linked
foam body.
[0033] It is to be understood that both the foregoing general
description and the following detailed description are exemplary
and explanatory and are intended to provide further explanation of
the invention as claimed.
Advantageous Effects
[0034] According to the present invention, because the cross-linked
foam for uppers of shoes is formed in a three-dimensional shape
according to the shape of the last having a complex curved surface
so that dimension and shape stabilities can be provided to the
shoes.
[0035] Because the cross-linked foam of the present invention has
at least one inner cavity structure therein formed simultaneously
with the cross-linked foam and the inner cavity may have gas
therein at a certain pressure, fitting feeling and supporting
property is greatly improved.
[0036] The cross-linked foam of the present invention can more
perfectly protect the feet from an external impact because at least
one of the inner cavity structures can be filled with the filler
having a required property.
[0037] The cross-linked foam of the present invention can provide
air ventilation and waterproof properties to the shoes so that air
in the shoes can effectively discharged out of the shoes while
moisture can not permeates the shoes.
BRIEF DESCRIPTION OF THE DRAWINGS
[0038] The above and other objects, features and other advantages
of the present invention will be more clearly understood from the
following detailed description taken in conjunction with the
accompanying drawings, in which:
[0039] FIG. 1 is illustrating a three-dimensional cross-linked foam
for uppers of shoes according to an embodiment of the present
invention;
[0040] FIGS. 2 to 3 are cross-sectional views of the
three-dimensional cross-linked foam taken along lines A-A' and B-B'
of FIG. 1, respectively;
[0041] FIG. 4 is a cross-sectional view of the three-dimensional
cross-linked foam when the inner cavity structure of FIG. 2 is
filled with filler;
[0042] FIG. 5 is a cross-sectional view of the three-dimensional
cross-linked foam when the inner cavity structure of FIG. 3 is
filled with filler;
[0043] FIG. 6 is a cross-sectional view of the three-dimensional
cross-linked foam when a housing filled with filler is inserted
into the inner cavity structure of FIG. 2;
[0044] FIG. 7 is illustrating a three-dimensional cross-linked foam
for uppers of shoes according to another embodiment of the present
invention;
[0045] FIGS. 8 to 9 are cross-sectional views of the
three-dimensional cross-linked foam taken along lines C-C' and D-D'
of FIG. 7, respectively;
[0046] FIG. 10 is illustrating a three-dimensional cross-linked
foam for uppers of shoes according to another embodiment of the
present invention;
[0047] FIGS. 11 to 12 are cross-sectional views of the
three-dimensional cross-linked foam taken along lines E-E' and F-F'
of FIG. 10, respectively; and
[0048] FIGS. 13 and 14 are illustrating a side and a bottom of a
last.
MODE FOR THE INVENTION
[0049] Reference will now be made in detail to the preferred
embodiment of the present invention, which is illustrated in the
accompanying drawings. A same name will be used for an element of
the present invention that has a same or corresponding function
even if it has a different reference number.
[0050] FIG. 1 is illustrating a three-dimensional cross-linked foam
for uppers of shoes according to an embodiment of the present
invention and FIGS. 2 to 3 are cross-sectional views of the
three-dimensional cross-linked foam taken along lines A-A' and B-B'
of FIG. 1, respectively. The cross-linked foam 100 for uppers of
shoes mainly comprises a cross-linked foam body 120 and inner
cavity structures 142 and 146 formed simultaneously with the
cross-linked foam body in a unity. The cross-linked foam body 120
is obtained by various cross-linked foaming methods known in the
field and has a shape corresponding to a curved surface of a last
10 of FIGS. 13 to 14. An inner surface 180 of the cross-linked foam
body 120 may desirably have a three-dimensional shape corresponding
to an outer curved surface of the last 10. Portions of the inner
surface 180 corresponding to fore-foot, middle-foot and or
rear-foot may desirably have a same shape as the fore-foot "a",
middle-foot "b" and "c" or rear-foot "d" of the last 10,
respectively.
[0051] The inner cavity structures 142 and 146 are defined by an
internally formed surface 132 of the cross-linked foam body 120.
Though the inner cavity structure 142 and 146 may desirably be
formed along a curved surface of the cross-linked foam body 120 as
shown in FIGS. 2 and 3, a shape of the inner cavity structure is
not confined to a certain shape.
[0052] The inner cavity structure 142 and 146 provides stability
and supporting property to the cross-linked foam body 120 and
improves a fitting feeling of the shoes. Accordingly, the
cross-linked foam body 120 itself can effectively protect the feet
without additional components attached.
[0053] Unexplained elements having reference numbers 122 and 124
are covering portions of the inner cavity structures 142 and 146,
respectively. Though the covering portions 122 and 124 are
protruded over a surface of the cross-linked foam body 120 in FIGS.
2 and 3, they may be leveled with the surface of the cross-linked
foam body 120.
[0054] Though two inner cavity structures are formed on a left
lateral side of the cross-linked foam body 120 in the figures, the
shape, number and position of the inner cavity structure can be
controlled under various conditions.
[0055] When the cross-linked foam body 120 has a plurality of inner
cavity structures, the plural inner cavity structures may not be
connected to each other or all or some of them may be connected to
each other. Or the plural inner cavity structures may form groups
consisting of connected inner cavity structures, that is, the
plural inner cavity structures may consist of plural groups in each
of which adjacent inner cavity structures among the plural inner
cavity structures are connected to each other.
[0056] The cross-linked foam body 120 has inner and outer air
passages 196 and 192 connected to at least one of inner cavity
structures so that air can circulates in and out of the
cross-linked foam body 120 as in FIG. 3. The position, number and a
selection of the inner cavity structure to be connected to the air
passage are not limited and changeable under various conditions. A
valve may be connected to the air passages 192 and 196 to control
an amount of the air flowing in and out of the cross-linked foam
body 120.
[0057] Though the inner cavity structure 142 and 146 itself has a
superior shock-absorbing property and an elasticity, those
properties can be more increased by injecting gas selected from
various known gases into all or some of the inner cavity
structures.
[0058] Though it is not shown in figures, unevenness may further be
formed on the cross-linked foam body 120 at a position
corresponding to an instep of fore-foot to which a repeated bending
stress is applied and to a heel portion that should protect the
feet from an external impact.
[0059] FIG. 4 is a cross-sectional view of the three-dimensional
cross-linked foam when the inner cavity structure of FIG. 2 is
filled with filler and FIG. 5 is a cross-sectional view of the
three-dimensional cross-linked foam when the inner cavity structure
of FIG. 3 is filled with filler. Each of the inner cavity
structures 142 and 146 are filled with different materials, i.e.,
fillers 162 and 166, having different physical properties to
increase the fitting feeling of the shoes and more effectively
protect the feet from the external impact.
[0060] A phase and a kind of the filler 162 and 166 is not limited
and can be selected from various materials in a phase of gas,
liquid or solid. Besides, an injection molded material having a
certain shape may be selected as the filler. A same filler may be
filled into connected inner cavity structures or a same or
different material may be injected into the group consisting of
connected inner cavity structures connected to the adjacent inner
cavity structures.
[0061] The idea on the shapes of the cross-linked foam body, the
covering portions of inner cavity structure and the unevenness and
a formation of the air passage that is already described with
reference to FIGS. 2 to 3 can be applied to this embodiment with a
same rule.
[0062] FIG. 6 is a cross-sectional view of the three-dimensional
cross-linked foam when a housing filled with filler is inserted
into the inner cavity structure of FIG. 2. Because an independent
housing 172 is filled with the filler 162 and then the housing 172
is inserted into the inner cavity structure 142, the filler 162 can
be more safely and perfectly introduced into the inner cavity
structure 142 regardless of the shape and phase.
[0063] Though a material of the housing 172 is not limited as long
as the housing can be properly introduced into the inner cavity
structure 142 and make a close contact with the internally formed
surface 132 of the cross-linked foam body 120, it may desirably be
thermoplastic polyurethane (TPU) that is widely used as a material
for various kinds of housings.
[0064] FIG. 7 is illustrating a three-dimensional cross-linked foam
for uppers of shoes according to another embodiment of the present
invention and FIGS. 8 to 9 are cross-sectional views of the
three-dimensional cross-linked foam taken along lines C-C' and D-D'
of FIG. 7, respectively. As shown in the figures, three groups of
inner cavity structures are formed in the cross-linked foam body
220 at different portions of the cross-linked foam body 220. The
reference numbers 222, 224 and 226 are covering portions of the
three groups of inner cavity structures. Inner cavity structures
belonging to groups corresponding to the covering portions 224 and
226 are connected to other inner cavity structures in the same
group. Inner and outer air passages 296 and 292 are connected to
the inner cavity structure 242 and the inner cavity structure 262
is filled with filler 246. Though it is not shown in the figures,
the inner cavity structure formed at a position corresponding to
the covering portion 222 of a heel portion of the uppers may be
filled with the gaseous material.
[0065] In this embodiment, the inner cavity structure is formed at
a portion of the uppers requiring a fitting feeling and a
supporting property and filled with the filler having a required
physical property. Accordingly, the fitting feeling and the
supporting property can be greatly improved. Besides, the
cross-linked foam body 220 can have a function of ventilation by
forming the air passages connected to the inner cavity structure.
The cross-linked foam body can have a waterproof function by
controlling positions of the air passages 292 and 296 so that the
air can freely circulates in and out of the cross-linked foam body
while the moisture cannot infiltrate into the cross-linked foam
body. For example, as shown in figures, the waterproof function is
provided by forming the inner air passage 296 on upper portion of
the inside of the cross-linked foam for uppers and forming the
outer air passage 292 on lower portion of the outside of the
cross-linked foam for uppers.
[0066] FIG. 10 is illustrating a three-dimensional cross-linked
foam for uppers of shoes according to another embodiment of the
present invention and FIGS. 11 to 12 are cross-sectional views of
the three-dimensional cross-linked foam taken along lines E-E' and
F-F' of FIG. 10, respectively. The inner surface 380 of the
three-dimensional cross-linked foam 300 is naturally shaped after
the outer curved surface of the last 10 of FIGS. 13 and 14. Inner
and outer air passages 396 and 392 are formed in the cross-linked
foam body 320 so that air can freely circulate between the inside
and the outside of the cross-linked foam body 320. However, the
inner cavity structure is not formed in the cross-linked foam body
320 unlike the previous embodiments. Though fore-mentioned
descriptions pertaining to the inner cavity structure cannot be
applied to this embodiment, the same idea and technique can be
applied to this embodiment except those pertaining to the inner
cavity structure.
[0067] Unexplained reference numbers 324 and 326 are protrusions
over the surface of the cross-linked foam body 320. Though the
cross-linked foam bodies 120, 220 and 320 have a shape of an upper
in the embodiments of the present invention, the cross-linked foam
body may have a shape of a portion of the uppers such as fore-foot,
middle-foot, rear-foot.
[0068] The cross-linked foam bodies 120, 220 and 320 can be
manufactured by foaming various foaming material known in the field
by various foaming methods known in the field. The foaming material
for the cross-linked foam bodies 120, 220 and 320 may be selected
from a synthetic material having a possibility to become a foam
using a various cross-linked foaming method, for example, synthetic
resins such as an EVA based resin, a polyolefin based resin
containing PEs of a variety of densities, a polyvinyl based resin,
a polyurethane based resin, and LDPE(low density
polyethylene)-added EVA, a copolymer thereof, a blend thereof, or a
mixture thereof; a natural or synthetic rubber constituted by a
mixture of a natural rubber, a styrene butadiene rubber (SBR)
based, a poly-butadiene rubber(BR) based, an poly-isoprene
rubber(IR) based, a chloroprene rubber(CR) based, an nitrile rubber
(NBR) based, an EPDM rubber based, an ethylene-propylene
rubber(EPR) based, and an acryl rubber (AR) based rubber, and/or an
styrene butadiene rubber(SBR) added neoprene rubber(NR); and a
composite material including an EPDM rubber added ethylene-vinyl
acetate (EVA) and a poly-vinyl chloride (PVC) added nitrile rubber
(NBR).
[0069] However, it is recommended to adopt EVA (ethylene-vinyl
acetate) that can contain a variable percentage of an amount of
vinyl acetate (VA %) or the polyethylene (PE) based synthetic resin
having various densities as the source material.
[0070] It will be apparent to those skilled in the art that various
modifications and variations can be made in a manufacturing method
of three-dimensional cross-linked foam for uppers for shoes without
departing from the spirit or scope of the invention. Thus, it is
intended that the present invention cover the modifications and
variations of this invention provided they come within the scope of
the appended claims and their equivalents.
* * * * *