U.S. patent application number 14/238768 was filed with the patent office on 2014-07-10 for impact-absorbing member, protective clothing, and process for producing impact-absorbing member.
This patent application is currently assigned to SEKISUI CHEMICAL CO., LTD.. The applicant listed for this patent is SEKISUI CHEMICAL CO., LTD.. Invention is credited to Masanori Nakamura.
Application Number | 20140189922 14/238768 |
Document ID | / |
Family ID | 49160805 |
Filed Date | 2014-07-10 |
United States Patent
Application |
20140189922 |
Kind Code |
A1 |
Nakamura; Masanori |
July 10, 2014 |
IMPACT-ABSORBING MEMBER, PROTECTIVE CLOTHING, AND PROCESS FOR
PRODUCING IMPACT-ABSORBING MEMBER
Abstract
An impact-absorbing member having excellent blade-proof
performance is provided. An impact-absorbing plate (1) includes a
plurality of stretched resin films (10) stacked and bonded to one
another, and the plurality of stretched resin films (10) include a
biaxially stretched resin film (12).
Inventors: |
Nakamura; Masanori;
(Kyoto-city, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
SEKISUI CHEMICAL CO., LTD. |
Osaka-city, Osaka |
|
JP |
|
|
Assignee: |
SEKISUI CHEMICAL CO., LTD.
Osaka-city, Osaka
JP
|
Family ID: |
49160805 |
Appl. No.: |
14/238768 |
Filed: |
February 8, 2013 |
PCT Filed: |
February 8, 2013 |
PCT NO: |
PCT/JP2013/053041 |
371 Date: |
February 13, 2014 |
Current U.S.
Class: |
2/2.5 ;
156/308.2; 428/137; 428/221; 428/316.6; 428/480; 442/287 |
Current CPC
Class: |
B32B 2307/581 20130101;
B32B 5/22 20130101; Y10T 428/249921 20150401; B32B 7/00 20130101;
B32B 27/08 20130101; B32B 2250/42 20130101; B32B 27/00 20130101;
B32B 2307/518 20130101; B32B 2250/40 20130101; B32B 15/08 20130101;
B32B 5/06 20130101; Y10T 428/31786 20150401; B32B 7/10 20130101;
B32B 5/02 20130101; B32B 2307/514 20130101; B32B 2307/516 20130101;
B32B 1/00 20130101; B32B 15/00 20130101; B32B 7/04 20130101; B32B
3/00 20130101; B29C 55/12 20130101; B32B 7/12 20130101; B32B 7/02
20130101; B32B 15/04 20130101; B32B 27/06 20130101; Y10T 442/3862
20150401; B32B 2250/00 20130101; B32B 3/26 20130101; B32B 3/06
20130101; B32B 2307/558 20130101; B32B 5/04 20130101; F41H 1/02
20130101; B32B 2571/02 20130101; Y10T 428/249981 20150401; B32B
7/14 20130101; B32B 5/024 20130101; B29C 55/02 20130101; B32B 27/12
20130101; Y10T 428/24322 20150115; B32B 2571/00 20130101 |
Class at
Publication: |
2/2.5 ; 428/480;
442/287; 428/221; 428/137; 428/316.6; 156/308.2 |
International
Class: |
F41H 1/02 20060101
F41H001/02 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 12, 2012 |
JP |
2012-054528 |
Claims
1. An impact-absorbing member comprising: a plurality of stretched
resin films stacked and bonded to one another, wherein the
plurality of stretched resin films include a biaxially stretched
resin film.
2. The impact-absorbing member according to claim 1, wherein the
plurality of stretched resin films include the biaxially stretched
resin film and a uniaxially stretched resin film.
3. The impact-absorbing member according to claim 2, wherein at
least one of principal surfaces of a laminate of the plurality of
stretched resin films is formed of the uniaxially stretched resin
film.
4. The impact-absorbing member according to claim 2, wherein the
plurality of stretched resin films include a plurality of
uniaxially stretched resin films whose stretching directions are
mutually different.
5. The impact-absorbing member according to claim 1, further
comprising at least one of a woven fabric and a braided fabric
which is stacked on the plurality of stretched resin films.
6. The impact-absorbing member according to claim 1, wherein the
plurality of stretched resin films include a plurality of biaxially
stretched resin films Whose stretching directions are mutually
inclined.
7. The impact-absorbing member according to claim 1, wherein the
stretched resin film includes a crystalline polymer.
8. The impact-absorbing member according to claim 1, wherein a
180.degree. peeling strength per 1 cm of width of the adjacent
stretched resin films is 0.1 kgf to 3 kgf.
9. The impact-absorbing member according to claim 1, wherein the
adjacent stretched resin films are bonded directly to each
other.
10. The impact-absorbing member according to claim 1, further
comprising an adhesive layer that bonds the adjacent stretched
resin films.
11. The impact-absorbing member according to claim 1, wherein the
adjacent stretched resin films are at least partially kept from
being not bonded to each other.
12. The impact-absorbing member according to claim 11, wherein the
stretched resin films have as through-hole, and the plurality of
stretched resin films are bound together by a binding member
inserted in the through-hole.
13. The impact-absorbing member according to claim 12, wherein the
binding member is formed of a metal.
14. The impact-absorbing member according to claim 1, wherein the
stretched resin films are formed of a porous material.
15. The impact-absorbing member according to claim 1, wherein the
stretched resin film has a vent hole.
16. The impact-absorbing member according to claim 15, wherein the
vent hole provided in one of the stretched resin films and a vent
hole provided in a stretched resin film adjacent to the one of the
stretched resin films do not overlap each other.
17. Protective clothing comprising: the impact-absorbing member
according to claim 1.
18. A method for producing an impact-absorbing member, wherein a
plurality of stretched resin films including a biaxially stretched
resin film are stacked and thermocompression-bonded to obtain an
impact-absorbing member.
19. The impact-absorbing member according to claim 1, further
comprising at least one of a woven fabric and a braided fabric
which is stacked on the plurality of stretched resin films, wherein
the adjacent stretched resin films are partially kept from being
not bonded to each other.
20. The method for producing an impact-absorbing member according
to claim 18, wherein the impact-absorbing member comprises a
plurality of stretched resin films stacked and bonded to one
another, and at least one of a woven fabric and a braided fabric
which is stacked on the plurality of stretched resin films, and the
plurality of stretched resin films include a biaxially stretched
resin film, and the adjacent stretched resin films are partially
kept from being not bonded to each other.
Description
TECHNICAL FIELD
[0001] The present invention relates to an impact-absorbing member,
protective clothing including the impact-absorbing member, and a
process for producing an impact-absorbing member.
BACKGROUND ART
[0002] As a material to be used for a bulletproof vest or the like,
an impact-absorbing plate excellent in bulletproof performance and
blade-proof performance has been desired heretofore.
[0003] For example, Patent Document 1 proposes a fiber-reinforced
resin molded product as an impact-absorbing plate, and the
fiber-reinforced resin molded product is formed by impregnating a
fabric, which contains 0.01% by weight to 10% by weight of a
fluorine compound, with a resin composition.
RELATED ART DOCUMENT
Patent Document
[0004] Patent Document 1: JP 2002-316319 A
SUMMARY OF THE INVENTION
Problems to be Solved by the Invention
[0005] It is desired to further enhance blade-proof performance of
impact-absorbing plates.
[0006] A principal object of the present invention is to provide an
impact-absorbing member having excellent blade-proof
performance.
Means for Solving the Problems
[0007] An impact-absorbing member according to the present
invention includes a plurality of stretched resin films stacked and
bonded to one another. The plurality of stretched resin films
include a biaxially stretched resin film.
[0008] Preferably, the plurality of stretched resin films include
the biaxially stretched resin film and a uniaxially stretched resin
film.
[0009] At least one of principal surfaces of a laminate of the
plurality of stretched resin films may be formed of a uniaxially
stretched resin film.
[0010] Preferably, the plurality of stretched resin films include a
plurality of uniaxially stretched resin films whose stretching
directions are mutually different.
[0011] The impact-absorbing member according to the present
invention may further include at least one of a woven fabric and a
braided fabric which is stacked on the plurality of stretched resin
films.
[0012] Preferably, the plurality of stretched resin films include a
plurality of biaxially stretched resin films whose stretching
directions are mutually inclined.
[0013] Preferably, the stretched resin film includes a crystalline
polymer.
[0014] A 180.degree. peeling strength per 1 cm of width of the
adjacent stretched resin films is preferably 0.1 kgf to 3 kgf.
[0015] The adjacent stretched resin films may be bonded directly to
each other.
[0016] The impact-absorbing member according to the present
invention may further include an adhesive layer which bonds
adjacent stretched resin films to each other.
[0017] The adjacent stretched resin films may be at least partially
kept from being not bonded to each other.
[0018] The stretched resin films may have a through-hole, and the
plurality of stretched resin films may be bound together by a
binding member inserted in the through-hole.
[0019] Preferably, a binding member is formed of a metal.
[0020] The stretched resin film may be formed of a porous
material.
[0021] The stretched resin film may have a vent hole.
[0022] Preferably, the vent hole provided in one of the stretched
resin films and a vent hole provided in a stretched resin film
adjacent to the one of the stretched resin films do not overlap
each other.
[0023] Protective clothing according to the present invention
includes the impact-absorbing member according to the present
invention.
[0024] In a method for producing an impact-absorbing member
according to the present invention, a plurality of stretched resin
films including a biaxially stretched resin film are stacked and
thermocompression-bonded to obtain an impact-absorbing member.
Effect of the Invention
[0025] According to the present invention, it is possible to
provide an impact-absorbing member having excellent blade-proof
performance.
BRIEF DESCRIPTION OF DRAWINGS
[0026] FIG. 1 is a schematic sectional view of an impact-absorbing
plate according to a first embodiment.
[0027] FIG. 2 is a schematic sectional view of an impact-absorbing
plate according to a modification.
[0028] FIG. 3 is a schematic sectional view of an impact-absorbing
member according to a second embodiment.
[0029] FIG. 4 is a schematic sectional view of protective clothing
according to a third embodiment.
[0030] FIG. 5 is a schematic sectional view taken along the line
V-V in FIG. 4.
MODE(S) FOR CARRYING OUT THE INVENTION
[0031] One example of a preferred embodiment in which the present
invention is carried out will be described below. However, the
embodiment described below is merely illustrative. The present
invention is in no way limited to the embodiment described
below.
[0032] In the drawings which are referred to in the embodiment
etc., members having substantially the same function are referred
to with the same symbol. The drawings which are referred to in the
embodiment etc. are schematically described, so that the dimension
ratio etc.
[0033] of an article drawn in the drawing may be different from the
dimension ratio etc. of the real article. The dimension ratio etc.
of an article may vary among drawings. The specific dimension ratio
etc. of the article should be determined by considering the
following descriptions.
First Embodiment
[0034] As illustrated in FIG. 1, an impact-absorbing plate 1
includes a plurality of stretched resin films 10. A plurality of
stretched resin films 10 are stacked along a z axis direction, i.e.
a thickness direction. The stretched resin films 10 adjacent to
each other in the z axis direction are bonded to each other.
Specifically, the stretched resin films 10 adjacent to each other
in the z axis direction are bonded directly to each other. The
impact-absorbing plate 1A is configurated by a laminate including
the plurality of stretched resin films 10 stacked and stacked to
one another form.
[0035] As illustrated in FIG. 2, adjacent stretched resin films 10
may be bonded to each other by an adhesive layer 13. Preferably,
the adhesive layer 13 is formed of, for example, a thermoplastic
resin having a low melting point. Specific examples of the
thermoplastic resin that is preferably used include ethylene-vinyl
acetate copolymers, PVB resins, styrene ethylene-butylene styrene
block copolymers and polyethylene resins etc.
[0036] Preferably, the stretched resin film 10 includes a
crystalline polymer. In this case, the strength of the stretched
resin film 10 in a stretching direction can be enhanced. Specific
examples of the crystalline polymer that is preferably used include
polyethylene, polypropylene, polyamide, polyacetal, polyethylene
terephthalate, polybutylene terephthalate and liquid crystal
polymers etc. Among them, polyethylen, polypropylene, and
polyethylene terephthalate, which are easily draw-molded and are
inexpensive, are more preferably used. The stretched resin film 10
may be formed of a resin composition containing fibers.
[0037] The thickness of the stretched resin film 10 is not
particularly limited, and may be, for example, about 5 .mu.m to 100
.mu.m. When the thickness of the stretched resin film 10 is
excessively thin, it may become difficult to mold the stretched
resin film 10. When the thickness of the stretched resin film 10 is
excessively thick, impact absorption performance may be
deteriorated because the number of stacked films per unit thickness
decreases.
[0038] The number of stretched resin films 10 of the
impact-absorbing plate 1 may be appropriately set according to a
required level of blade-proof performance and bulletproof
performance and a thickness of the stretched resin film 10. The
number of stretched resin films 10 of the impact-absorbing plate 1
is more preferably, for example, about 50 to 400. Generally, the
thickness of the stretched resin film 10 and the number of stacked
stretched resin films 10 are adjusted so that the thickness of the
impact-absorbing plate 1 is about 2 mm to 10 mm.
[0039] A plurality of stretched resin films 10 include biaxially
stretched resin films 12. Specifically, the impact-absorbing plate
1 includes a biaxially stretched resin film laminate 1b including a
plurality of biaxially stretched resin films 12 stacked and bonded
to one another.
[0040] A plurality of stretched resin films 10 include uniaxially
stretched resin films 11a and 11b in addition to biaxially
stretched resin films 12. The uniaxially stretched resin film 11a
and the uniaxially stretched resin film 11b have mutually different
stretching directions. Specifically, the stretching direction of
the uniaxially stretched resin film 11a and the stretching
direction of the uniaxially stretched resin film 11b are
perpendicular to each other.
[0041] The impact-absorbing plate 1 is configurated by uniaxially
stretched resin film laminates 1a and 1c in which uniaxially
stretched resin film 11a and uniaxially stretched resin film 11b
are alternately stacked and bonded to one another. First and second
principal surfaces 1A and 1B of the impact-absorbing plate 1 are
formed of uniaxially stretched resin film laminates 1a and 1c.
Therefore, first and second principal surfaces 1A and 1B of the
impact-absorbing plate 1 are formed of the uniaxially stretched
resin film.
[0042] Next, action of the impact-absorbing plate 1 will be
described. When an impact is applied to the principal surface 1A or
the principal surface 1B of the impact-absorbing plate 1, stretched
resin films 10 bonded are peeled by the impact. Consequently,
energy of the impact is absorbed. Accordingly, for example, a crack
extending through the impact-absorbing plate 1 in a thickness
direction (z axis direction) is hard to be generated by energy of
the applied impact. Preferably the bonding strength of adjacent
stretched resin films 10 is appropriate for obtaining preferred
impact absorption performance. Specifically, a 180.degree. peeling
strength per 1 cm of width of adjacent stretched resin films 10 is
preferably 0.1 kgf to 3 kgf. When the 180.degree. peeling strength
per 1 cm of width of adjacent stretched resin films 10 is
excessively low, sufficient impact absorption performance may not
be obtained at the time of collision of articles because stretched
resin films 10 are peeled during transportation or storage etc.
When the 180.degree. peeling strength per 1 cm of width of adjacent
stretched resin films 10 is excessively high, energy of impact may
not be adequately absorbed because stretched resin films 10 are not
peeled when the impact is applied.
[0043] In the impact-absorbing plate 1, a plurality of stretched
resin films 10 include biaxially stretched resin films 12 as
described above. The biaxially stretched resin film 12 has a high
strength in each of two directions in which the film is stretched.
Thus, for example, even if an acute member sticks into biaxially
stretched resin films 12, the hole is hard to expand, and therefore
a sharp-edged member such as an ice pick is hard to pierce the
impact-absorbing plate 1 including biaxially stretched resin films
12. Similarly, even when slashed with an edged tool, the impact
absorbing plate 1 is hard to be pierced with the edged tool.
Therefore, the impact-absorbing plate 1 has excellent blade-proof
performance.
[0044] For obtaining further excellent blade-proof performance, all
of the stretched resin films included in the impact-absorbing plate
may be biaxially stretched resin films. However, the biaxially
stretched resin film has the problem that it is difficult to
enhance an elastic modulus. When all of the stretched resin films
are biaxially stretched resin films, it may become difficult to
obtain an impact-absorbing plate which has a high elastic modulus
and is excellent in bulletproof performance.
[0045] On the other hand, the impact-absorbing plate 1 includes
uniaxially stretched resin films 11a and 11b in addition to
biaxially stretched resin films 2. In the case of uniaxially
stretched resin films 11a and 11b, elastic modulus is easily
enhanced as compared to the biaxially stretched resin film.
Therefore, according to the impact-absorbing plate 1 including
uniaxially stretched resin films 11a and 11b in addition to the
biaxially stretched resin films 2, not only excellent blade-proof
performance but also excellent bulletproof performance can be
achieved.
[0046] The impact-absorbing plate may include at least one of a
woven fabric and a braided fabric which is stacked on the stretched
resin films. The impact-absorbing plate may include at least one of
a woven fabric and a braided fabric in place of the uniaxially
stretched resin film. That is, the impact-absorbing plate may
include at least one of a woven fabric, a braided fabric and the
uniaxially stretched resin film in addition to the biaxially
stretched resin film.
[0047] As the braided fabric, for example, those formed by
alternately stacking strip-shaped uniaxially stretched resin films
along two or more different directions are preferably used.
Specifically, for example, those formed by alternately stacking
strip-shaped uniaxially stretched resin films along one direction
and another direction perpendicular to the one direction, those
formed by alternately stacking strip-shaped uniaxially stretched
resin films along the one direction, the another direction and a
direction inclined to the one direction at an angle of 45.degree.,
and the like are preferably used.
[0048] As the woven fabric, for example, plane weaves, twill
weaves, basket weaves and the like are preferably used.
[0049] For further improving bulletproof performance of the
impact-absorbing plate 1, at least one of principal surfaces 1A and
1B of the impact-absorbing plate 1 is preferably formed of the
uniaxially stretched resin film 11a or the uniaxially stretched
resin film 11b, and both principal surfaces 1A and 1B of the
impact-absorbing plate 1 are more preferably formed of the
uniaxially stretched resin film 11a or the uniaxially stretched
resin film 11b.
[0050] For further improving bulletproof performance of the
impact-absorbing plate 1, preferably the impact-absorbing plate 1
includes a plurality of uniaxially stretched resin films 11a and
11b whose stretching directions are mutually different, and more
preferably the stretching direction of the uniaxially stretched
resin film 11a and the stretching direction of the uniaxially
stretched resin film 11b are orthogonal to each other.
[0051] Similarly, for further improving bulletproof performance of
the impact-absorbing plate 1, preferably a plurality of stretched
resin films 10 include a plurality of biaxially stretched resin
films 12 whose stretching directions are mutually inclined.
[0052] For achieving excellent bulletproof performance, the total
of the thicknesses of uniaxially stretched resin films 11a and 11b
of the impact-absorbing plate 1 is preferably, for example, about
0.2 mm to 1 mm. For achieving excellent blade-proof performance,
the total of the thicknesses of biaxially stretched resin films 12
of the impact-absorbing plate 1 is preferably, for example, about 1
mm to 9 mm.
[0053] Next, a method for producing the impact-absorbing plate 1
will be described.
[0054] First, uniaxially stretched resin films 11a and 11b and the
biaxially stretched resin film 12 are provided. Uniaxially
stretched resin films 11a and 11b can be molded using at least one
of stretching methods such as, for example, a roll stretching
method, a draw-stretching method, a zone heating stretching method
and a stretching method by rolling. The draw ratio may be, for
example, about 15 to 30.
[0055] The biaxially stretched resin film 12 can be molded using at
least one of stretching methods such as, for example, an inflation
molding, a tubular-type biaxial stretching method and a tender-type
biaxial stretching method. The draw ratio may be, for example,
about 2 to 5.
[0056] Next, uniaxially stretched resin films 11a and 11b and the
biaxially stretched resin film 12 are appropriately stacked and
thermocompression-bonded, whereby the impact-absorbing plate 1 can
be produced. When the temperature during thermocompression bonding
is excessively high, stretched resin films 10 may be excessively
strongly fused together, or orientational relaxation of molecules
in the stretched resin film 10 may occur. On the other hand, when
the temperature during thermocompression bonding is extremely low,
the bonding strength of stretched resin films 10 may become
excessively low. Therefore, the temperature during
thermocompression bonding is preferably approximately a temperature
lower by 100.degree. C. to a temperature higher by 5.degree. C.
than the melting point of the stretched resin film 10.
Specifically, when the stretched resin film 10 is formed of
high-density polyethylene, the temperature during themocompression
bonding is preferably about 120.degree. C. to 130.degree. C. When
the stretched resin film 10 is formed of polyethylene
terephthalate, the temperature during themocompression bonding is
preferably about 150.degree. C. to 200.degree. C.
[0057] The stacking order of stretched resin films 10 is not
particularly limited to the stacking order in the impact-absorbing
plate 1. For example, uniaxially stretched resin films and
biaxially stretched resin films may be alternately stacked. In this
case, for example, a uniaxially stretched resin film stretched in
one direction, the biaxially stretched resin film, a uniaxially
stretched resin film stretched in a direction perpendicular to the
one direction, and the biaxially stretched resin film 12 may be
stacked in this order.
[0058] Another example of a preferred embodiment of the present
invention will be described. In the following descriptions, members
having substantially the same function with the first embodiment
are referred to with the same symbol, and explanations thereof are
omitted.
Second Embodiment
[0059] FIG. 3 is a schematic sectional view of an impact-absorbing
member according to a second embodiment.
[0060] The first embodiment has been described by showing as an
example the impact-absorbing plate 1 that is a rigid body in which
adjacent stretched resin films 10 are wholly bonded to each other
as one embodiment of the impact-absorbing member according to the
present invention. However, the present invention is not limited to
this configuration. For example, adjacent stretched resin films may
at least partially kept from being not bonded to each other.
[0061] In an impact-absorbing member 1a according to this
embodiment, adjacent stretched resin films 10 are not bonded to
each other, and therefore can be relatively displaced. In each of a
plurality of stretched resin films 10, a plurality of through-holes
10a are provided at intervals from one another. A plurality of
stretched resin films 10 are stacked such that through-holes 10a of
one film overlap those of another film.
[0062] A plurality of stretched resin films 10 are bound together
by binding members 20 inserted in through-holes 10a. The binding
member 20 includes a pillar portion 21 and first and second head
portions 22a and 22b. The pillar portion 21 is inserted in the
through-hole 10a, and extends from one side to the other side of a
laminate of a plurality of stretched resin films 10. The first head
portion 22a is joined to one end of the pillar portion 21, and
situated at one side of the laminate of a plurality of stretched
resin films 10. The second head portion 22b is joined to the other
end of the pillar portion 21, and situated at the other side of the
laminate of a plurality of stretched resin films 10. The first and
second head portions 22a and 22b are larger than the through-hole
10a. Therefore, stretched resin films 10 are integrated in such a
manner as to be retained by the first and second head portions 22a
and 22b.
[0063] Preferably, the binding member 20 is formed of a metal. In
this case, excellent bulletproof performance and blade-proof
performance can also be imparted to sections provided with
through-holes 10a. Preferably, the first and second head portions
22a and 22b are so sized as to cover the whole through-hole 10a
irrespective of a location in the through-hole 10a at which the
pillar portion 21 is situated.
[0064] When adjacent stretched resin films 10 are at least
partially kept from being not bonded to each other as in this
embodiment, the impact-absorbing member 1a having flexibility can
be provided. The impact-absorbing member la having flexibility as
described above is particularly suitably used in applications where
flexibility or plasticity is required, such as, for example, those
of clothing etc.
[0065] For obtaining higher plasticity, it is preferred that the
pillar portion 21 is thinner than the through-hole 10a, and a
clearance is provided between the outer circumferential surface of
the pillar portion 21 and the inner circumferential surface of the
through-hole 10a. The ratio of the diameter of the pillar portion
21 to the diameter of the through-hole 10a is preferably 1.0 or
less, more preferably 0.8 or less. However, when the pillar portion
21 is excessively thin, the strength of the pillar portion 21 may
be excessively reduced. Therefore, the ratio of the diameter of the
pillar portion 21 to the diameter of the through-hole 10a is
preferably 0.6 or more.
[0066] The length of the pillar portion 21 is preferably longer
than the total thickness of a plurality of stacked stretched resin
films 10. The ratio of the length of the pillar portion 21 to the
total thickness of a plurality of stacked stretched resin films 10
is more preferably 1.0 or more, further preferably 1.2 or more.
However, when the pillar portion 21 is excessively long, a
plurality of stretched resin films 10 may not be suitably bound.
Therefore, the ratio of the length of the pillar portion 21 to the
total thickness of a plurality of stacked stretched resin films 10
is preferably 1.3 or less.
[0067] In the impact-absorbing member 1a according to this
embodiment, the stacked form of stretched resin films 10 is
substantially the same as that in the impact-absorbing member 1
according to the first embodiment. Therefore, in this embodiment,
the descriptions of the first embodiment are incorporated with
regard to the stacked form of stretched resin films 10.
[0068] In this embodiment, an example has been described in which a
plurality of stretched resin films 10 are bound using the binding
member 20, but adjacent stretched resin films 10 may be partially
bonded to each other using an adhesive, or bonded directly to each
other.
Third Embodiment
[0069] FIG. 4 is a schematic sectional view of protective clothing
according to a third embodiment. FIG. 5 is a schematic sectional
view taken along the line V-V in FIG. 4.
[0070] The impact-absorbing member according to the present
invention is excellent in bulletproof performance and blade-proof
performance, and therefore can be used in various applications such
as, for example, those of protective clothing, protective shoes,
vehicles, buildings and protectors such as shields. Particularly,
an impact-absorbing member having flexibility, like the
impact-absorbing member 1a according to the second embodiment, is
suitably used for protective clothing etc.
[0071] In this embodiment, protective clothing 2 including an
impact-absorbing member 1b having flexibility as illustrated in
FIG. 5 will be described.
[0072] The protective clothing 2 includes a clothing body 30 made
of cloth which forms the outer surface of the protective clothing
2. As illustrated in FIG. 5, the impact-absorbing member 1b is
arranged inside the clothing body 30. The impact-absorbing member
1b has substantially the same configuration as that of the
impact-absorbing member 1a according to the second embodiment
except that the stretched resin film 10 has a vent hole 10b. The
impact-absorbing member 1b is continuously arranged substantially
all over the clothing body 30.
[0073] For example, when a rigid body such as a metal plate etc. is
arranged inside the clothing body, the rigid body can be arranged
only on a part of the clothing body. When the rigid body is
arranged all over the clothing body, flexibility of the protective
clothing is lost, so that it becomes difficult to put on and take
off the clothing, and also movement of a person wearing the
protective clothing is significantly restricted. Commonly
tile-shaped rigid bodies are arranged in a matrix form at intervals
from one another. In this case, bulletproof performance and
blade-proof performance between rigid bodies are not secured. On
the other hand, the impact-absorbing member 1b has flexibility.
Therefore, for example, even when the impact-absorbing member 1b is
continuously provided all over the clothing body 30 with no gap
left, flexibility of the protective clothing 2 is maintained.
Therefore, the impact-absorbing member 1b can be continuously and
largely provided inside the clothing body 30. Accordingly, the
protective clothing 2 excellent in protective performance can be
provided.
[0074] Since the stretched resin film 10 is provided with the vent
hole 10b, the protective clothing 2 excellent in air permeability
can be provided. Instead of providing the vent hole 10b, the
stretched resin film 10 may be formed of a porous material having
an interconnected cell. The stretched resin film 10 may be formed
of a porous material having an interconnected cell, and provided
with the vent hole 10b.
[0075] In this embodiment, vent holes 10b of adjacent stretched
resin films 10 are provided so as not overlap each other in a
stacking direction. Therefore, for example, portions having low
bulletproof performance and blade-proof performance are hard to
occur as compared to a case where vent holes are provided so as to
overlap one another in a stacking direction.
[0076] As illustrated in FIG. 5, in the protective clothing 2, the
clothing body 30 and the impact-absorbing member 1b are fixed to
each other by the binding member 20. Between adjacent binding
members 20, the length of the impact-absorbing member 1b is longer
than the length of the clothing body 30. That is, the
impact-absorbing member 1b is loosely fixed to the clothing body 30
by the binding member 20. In this way, flexibility of the
protective clothing 2 is further enhanced. Between adjacent binding
members 20, the ratio of the length of the impact-absorbing member
1b to the clothing body 30 is preferably 1.0 or more, more
preferably 1.1 or more for enhancing flexibility of the protective
clothing 2. The ratio of the length of the clothing body 30 to the
length of the impact-absorbing member 1b is usually 1.2 or
less.
[0077] The distance between adjacent binding members 20 may be, for
example, about 30 mm to 100 mm. When the distance between adjacent
binding members 20 is excessively short, flexibility of the
protective clothing 2 may be excessively reduced. When the distance
between adjacent binding members 20 is excessively long, handling
characteristics of the protective clothing 2 may be
deteriorated.
EXAMPLE 1
[0078] A biaxially stretched polyester film having a thickness of
16 .mu.m (FT16 manufactured by Teijin Limited) was cut into squares
of 200 mm, and the sheets thus obtained were stacked in 150 layers.
The obtained laminate was heated and pressed under a press load of
10 t using a pressing machine (30 t Pressure Pressing Machine
manufactured by Toyo Seiki Seisaku-Sho, Ltd.) with the surface
temperature set at 180.degree. C. Thereafter, the setting of the
surface temperature of the pressing machine was changed to
140.degree. C. and the laminate was held for 60 minutes while a
press load of 10 t was maintained. The sample was cooled to room
temperature while a pressure of 5 t was applied using a cooled
pressing machine (30 t Pressure Pressing Machine manufactured by
Toyo Seiki Seisaku-Sho, Ltd.). The thickness of the obtained
biaxially stretched polyester film laminate was 2 mm.
[0079] Two uniaxially stretched high-density polyethylene sheets
with a laminate film (Forte manufactured by SEKISUI SEIKEI Co.,
Ltd.), which had a thickness of 0.2 mm and a width of 200 mm, were
stacked such that stretching directions were orthogonal to each
other, and the obtained laminate was heated and pressed under a
press load of 5 t for approximately 2 minutes using a pressing
machine (30 t Pressure Pressing Machine manufactured by Toyo Seiki
Seisaku-Sho, Ltd.) with the surface temperature set at 125.degree.
C., thereby obtaining a uniaxially stretched resin film laminate
having a thickness of 0.4 mm.
[0080] The uniaxially stretched resin film laminate prepared as
described above was stacked on both surfaces of the biaxially
stretched polyester film laminate prepared as described above, with
a film, which was obtained by heating and compressing to a
thickness of 0.1 mm an ethylene vinyl acetate film (SP Sealant
manufactured by Sekisui Film Co., Ltd.) having a thickness of 0.1
mm, interposed therebetween, and the obtained laminate was heated
and pressed under a press load of 5 t for approximately 2 minutes
using a pressing machine (30 t Pressure Pressing Machine
manufactured by Toyo Seiki Seisaku-Sho, Ltd.) with the surface
temperature set at 125.degree. C., thereby preparing an
impact-absorbing plate having a thickness of 2.9 mm.
COMPARATIVE EXAMPLE
[0081] 14 uniaxially stretched high-density polyethylene sheets
with a laminate film (Forte manufactured by SEKISUI SEIKEI Co.,
Ltd.), which had a thickness of 0.2 mm and a width of 200 mm, were
stacked such that stretching directions were orthogonal to each
other between adjacent sheets, and the obtained laminate was heated
and pressed under a press load of 5 t for approximately 10 minutes
using a pressing machine (30 t Pressure Pressing Machine
manufactured by Toyo Seiki Seisaku-Sho, Ltd.) with the surface
temperature set at 125.degree. C., thereby preparing an
impact-absorbing plate having a thickness of 2.9 mm.
EXAMPLE 2
[0082] A biaxially stretched polyester film having a thickness of
16 .mu.m (FT16 manufactured by Teijin Limited) was cut into squares
of 200 mm, and the sheets thus obtained were stacked in 150 layers.
Holes having a diameter of 10 mm were formed in a matrix form at
intervals of 50 mm in the obtained laminate using a drill. An epoxy
adhesive (Araldite 8-254-01 manufactured by AS ONE Corporation) was
poured into each of a plurality of holes formed, and the laminate
was left standing for 2 days to bond the stacked biaxially
stretched polyester films, thereby obtaining an impact-absorbing
plate.
[0083] (Impact Resistance Test)
[0084] A cylindrical hole having a diameter of 20 mm and a depth of
30 mm was formed at one end surface of a cylindrical brass material
having a diameter of 38 mm, thereby preparing a 1 kg weight
provided with a cylindrical hole. An eyeleteer hilt manufactured by
DEBIKA Corporation was inserted into the cylindrical hole of the
weight to prepare a blade with a weight. The blade with a weight
was caused to fall down from 1.5 m above the impact-absorbing plate
through the inside of an aluminum cylindrical pipe having a
diameter of 40 mm, which was arranged on the impact-absorbing plate
arranged on a cork board having a thickness of 5 cm, thereby
colliding the blade against the impact-absorbing plate. A length of
a part of the blade (needle), which resultantly pierced through the
impact-absorbing plate, was measured.
[0085] As a result, the length of a part, which pierced through the
impact-absorbing plate prepared in Example 1, was 6 mm. The length
of a part, which pierced through the impact-absorbing plate
prepared in Example 2, was 12 mm. On the other hand, the length of
a part, which pierced through the impact-absorbing plate prepared
in Comparative Example, was 18 mm.
EXPLANATION OF SYMBOLS
[0086] 1, 1a, 1b . . . impact-absorbing plate [0087] 1A, 1B . . .
principal surface [0088] 1a, 1c uniaxially stretched resin film
laminate [0089] 1b . . . biaxially stretched resin film laminate
[0090] 2 . . . protective clothing [0091] 10 . . . stretched resin
film [0092] 10a . . . through-hole [0093] 11a, 11b . . . uniaxially
stretched resin film [0094] 12 . . . biaxially stretched resin film
[0095] 13 . . . adhesive layer [0096] 20 . . . binding member
[0097] 21 . . . pillar portion [0098] 22a . . . first head portion
[0099] 22b . . . second head portion
* * * * *