KR19980702053A - Polyurethane sole for safety shoes resistant to explosion and fragmentation - Google Patents

Abstract

A blast and fragment resistant polyester or polyether-based polyurethane boot sole (13) is described, comprising embedded protective material composed of at least one woven polyaramid (Kevlar) layer (18). One or more layers of graphite fibres, ceramic fibres, S-glass fibres or mineral fibres may be also interwoven with or placed between the polyaramid layers.

Description

Polyurethane sole for safety shoes resistant to explosion and fragmentation

U. S. Patent No. 5,237, 758 to Zachman describes a semi-elliptic region in which adjacent webs of adjacent loops traverse flexible loops directed through transverse loops in a loop. The use of -ellipical sections is described to minimize the lateral displacement of adjacent webs.

U. S. Patent No. 5,285, 583 to Aleven consists of plastic, a flexible shear having an insole plate bonded to its bottom surface, and a fiber liner bonded to its upper surface during the molding process of the protective plastic layer. The use of a protective layer comprising a fabric liner is described. The plastic used by Alleben is a molten plastic that is injected in the final attachment process.

International Patent DE 4214802, filed by Jeff H, and assigned to Sportarticelfabrik UHL GMBH KARL, has a walking surface, a damping intermediate insole. Multi-layered shoe soles with soles and upper insoles are described. The base is a thermoplastic molded part, or made of metal, ceramic or graphite, in which multi-filament organic or inorganic reinforcing fibers are embedded in the form of a mat, a woven fabric or a knitted fabric. Resilient inclined portions are formed on the bottom surface of the base by injection molding or pressing. The base may only comprise a single layer of fabric, the overall thickness of which is approximately 0.5 mm.

Alleben gained strength and impact resistance from the plastic plates in the insole, and the use of a fabric mesh is to reinforce the plastic and does not improve the impact resistance. Jeff Hach is nothing more than a single layer of woven fabric not exceeding 0.5 mm by injection molding or pressing. Allenben does not mention metal, ceramic or graphite materials. There are still mentions of techniques using aramid, ceramic or graphite fibers in the thickness of the sole construction to prevent puncture by high-energy and high-speed projectiles, or due to problems with stiffness and adhesion. It didn't work.

Summary of the Invention

The soles described in the prior art enable running, jumping, rope ladders, rope climbing, and often walking, with a feeling or sensitivity sufficient to detect edges, pits and small stones. Protection against explosions and projectiles was insufficient if one wanted to maintain flexion from the toe to the heel to make it possible to eliminate obstacles such as back. To achieve this, the present invention includes a buried protective material, wherein the protective material is embedded over the entire shoe sole, and at least one woven poly having a density of at least 15 ounces per square yard or less. It consists of an aramid (Kevler) layer to provide a polyester sole and / or polyether-based polyurethane sole that is resistant to explosion and fragmentation. Increasing the density and adding the woven polyaramid fiber layers increase the resistance to explosion and fragmentation described above.

Another object of the present invention is to have good adhesion between various polyaramid (Kevlar) layers and / or graphite fiber bundles, despite the low inherent adhesion between polyaramid fibers, graphite fibers and polyurethanes. To provide a shoe sole. Due to the extremely thin coating of the various polyaramid (Kevlar) and / or graphite fiber bundles before weaving and / or due to the relatively loose or coarse weaving of the PolyAramid (Kevlar) fibers, the polyurethane may pass between the fibers Penetration allows the layers to adhere well to each other, thereby preventing the sole from peeling off in subsequent use.

According to the invention, polyaramid and / or graphite fibers can be thinly coated with a polyester or polyether based polyurethane before they are woven into the desired mat form, which is the polyaramid and polyurethane materials The adhesion of the liver can be greatly increased.

Also according to the invention, polyester fibers, preferably poly (ethyleneterephthalate) (PET) fibers are blended with or between the (coated or uncoated) polyaramid (Kevlar) fibers ( interwoven) to increase adhesion between the polyaramid and the polyurethane material.

Also in accordance with the present invention, carbon graphite fibers may be blended with or between the polyaramid (Kevlar) layers to further strengthen and cure the sole.

Also according to the invention, mineral fibers, in particular ceramic fibers or S-glass fibers, are included in the shoe sole as a barrier for protection against hot gases having a temperature between 815 and 1,650 ° C. It can work.

The present invention relates to a structure of a shoe sole, and more particularly, to prevent the opening of the shoe sole by a high energy and high speed projectile, thereby greatly protecting the individual's feet without undue limitation on movement. To improved safety soles.

The present invention may be better understood with reference to the following detailed description, and the objects defined above may be made clear. This description is detailed with reference to the accompanying drawings below.

1 is a vertical sectional view of a shoe having a first embodiment of a sole structure according to the present invention.

1A is an enlarged partial view of the sole structure of FIG.

Figure 2 is a vertical sectional view of a shoe having a second embodiment of the sole structure according to the present invention.

2A is an enlarged partial view of the sole structure of FIG.

3 is a vertical sectional view of a shoe having a third embodiment of a sole structure according to the present invention.

3A is an enlarged partial view of the sole structure of FIG.

3B is a partially enlarged view of the sole structure of the modification of the sole structure shown in FIG. 3A.

Figure 4 is a vertical sectional view of a shoe having a fourth embodiment of the sole structure according to the present invention.

4A is an enlarged partial view of the sole structure of FIG.

4B is a partially enlarged view of the sole structure of the modification of the sole structure shown in FIG. 4A.

A shoe with a first embodiment of the sole according to the invention is schematically represented by reference numeral 10 in FIGS. 1 and 1A.

The shoe 10 has a top 11 of standard shape and a synthetic sole 13. The synthetic sole 13 has an outer polyurethane sole 14 having a tread 17, a midsole 15 and optionally an upper portion having a layer 18 of polyaramid fiber embedded therein. Window 16.

The synthetic safety shoe is manufactured in a traditional multi-stage mold, which is commonly used in the polyurethane shoe industry.

The polyester and / or polyether-based polyurethane is first injected into a synthetic shoe mold cavity to form the sole 14 so that its density typically ranges from 500 to 2,000 kg / m ³ .

After removing the top plate of the mold for making the sole, a layer 18 of one thick polyaramid (Kevlar) woven fabric is placed on the sole 14 still remaining in the mold. Put it up.

The polyaramid (Kevlar) fibrous material may be precoated with polyester and / or polyether-based polyurethane prior to weaving. The coating of polyurethane facilitates good adhesion and penetration with the polyurethane injected into the mold cavity.

The density of the polyaramid layer 18 is at least 5 oz per square yard, preferably 15 oz per square yard, for each layer of woven polyaramid material.

This thick polyaramid layer 18 is preferably such that 70 to 90% is arranged in the XY direction (i.e., perpendicular to the direction from the toe to the heel), and 10 to 30% is arranged in the toe to heel direction. It consists of a bundle of crowfoot or leno woven polyaramid.

The thickness of the layer of the polyaramid layer 18 may be at least 0.07 inches, preferably 0.11 inches, with a tensile strength of 43,000 psi and a modulus of 19 million psi. And a Kevler 49 of 7,100 denier bundles with polyaramid fibers of 0.07 inch diameter.

After standing of the polyaramid layer 18, polyester and / or polyether-based polyurethane is injected into the mold cavity including the sole 14 at the base of the sole to form the midsole 15. . After injection into the mold, the polyurethane has a density of 1,000 kg / m ³ or less.

Good adhesion is achieved by allowing the polyaramid layer 18 to be interposed between the sole 14 and the midsole 15 due to penetration into and through the polyaramid layer 18 of the polyurethane.

In this step, the upper 11 is attached directly to the polyurethane synthetic sole 13 comprising the sole 14 and the midsole 15 or a third upper sole 16 to enhance comfort. This may be added to the top of the midsole. In the latter case, the sole 14 and the midsole 15 remain as described above in the mold cavity and the polyester and / or polyether-based polyurethane into the mold cavity, directly into the mold cavity 15) is injected into the top.

A shoe sole made to have a polyaramid layer 18 having a density of 15 oz per square yard according to the method described above has 60 grains (0.0648 g 1grain) having a speed of 1350 fps (feet per second). It is effective in providing resistance to explosions and fragmentation for projectiles of heavy weight. It also makes it possible to run and jump and to eliminate obstacles such as rope ladders, rope climbing and often walking, while in subsequent use the delaination of the sole is stacked on each layer. Maintain good flexibility from toes to heel to avoid peeling off.

A shoe having a second embodiment of the sole structure according to the invention is shown at 20 in FIGS. 2 and 2A.

In this embodiment, the same features have used the same reference numerals as used above, and the sole 13 further comprises a layer 18 of polyaramid fiber material contained therein.

As shown in FIG. 2A, the outsole may have two or more layers 18 of polyaramid fiber. The midsole 15 may have two to six layers of polyaramid fibers, preferably three layers as shown in FIG. 2A.

To produce the sole as shown in FIGS. 2 and 2A, two layers of polyaramid fabric 18 are placed in the mold cavity forming the outsole 14.

The polyaramid layers 18 are preferably made of polyaramid fibers having a diameter of 0.01 inch. The fibers are woven together to form a thickness of 0.06 inches or less, preferably 0.04 inches.

Then, polyester and / or polyether-based polyurethane is injected into the synthetic sole mold cavity to form the sole 14 so that its density typically ranges from 500 to 2,000 kg / m ³ . .

After removing the top plate of the mold for manufacturing the sole 14, the same layer 18 of the same polyaramid (Kevlar) woven as described above in two to six layers is then introduced into the sole 14. It is embedded in the outsole 14 which is still embedded in the mold.

In this step, polyester and / or polyether-based polyurethane is injected into the mold cavity to form the midsole 15 so that the polyurethane has a density of 1,000 kg / m ³ or less.

Good adhesion is achieved by allowing the polyaramid layer 18 to be interposed between the sole 14 and the midsole 15 due to penetration into and through the polyaramid layer 18 of the polyurethane.

In this step, the upper part 11 is attached directly to the polyurethane synthetic shoe sole 13 comprising the sole 14 and the midsole 15, or a third upper polyurethane window ( 16) may be included. This is achieved by allowing the sole and midsole (prepared by the above method) to remain in the mold cavity and injecting polyurethane of polyester and / or polyether-based onto the midsole 15. Can be.

Soles made according to the method are more effective in providing resistance to explosion and fragmentation compared to the first embodiment due to the multiple polyaramid layers.

In a third embodiment of the present invention, as described for the soles shown in FIGS. 1 and 2, the polyaramid layers 18 are blended with polyester (PET) fibers, the sole as described above. Prepared in the same way.

The use of blended polyaramid and polyester fibers has the advantage of further increasing the adhesion of the polyurethane material to the buried layers 18. This is due to the inherently good adhesion between polyurethane and polyester.

In a fourth embodiment of the present invention, as described in the above embodiments, the polyaramid layers 18 are carbon graphite fibers having a tensile strength between 12K tow and 470,000 fps and modulus between 35 million lp. Further blended with these, sole 13 was made in the same manner as described above.

The use of blended carbon graphite fibers further increases strength and hardening, and also has the advantage of increasing wear resistance.

In another embodiment of the present invention, shown at 30 in FIGS. 3 and 3A, a layer of ceramic fibers woven from synthetic ceramic / polyaramid fibers 31 is included in the midsole 15. The sole 13 is made identical to that described above.

The woven ceramic fiber layer is preferably a crowfoot in which 70 to 90% is arranged in the XY direction (vertical to the direction of the toe to the heel) and 10 to 30% is arranged from the toe to the heel. Or leno woven, ceramic fibers of 0.05 inches in diameter. This layer is embedded in the midsole on the polyaramid (Kevlar) layers 18 (see FIG. 3A). In another arrangement, as shown in FIG. 3B, thin (0.025 inch), composite layers 32 of ceramic / polyaramid fibers, preferably composed of standard bidirectional tissue, may be embedded in the upper window 16.

The shoe sole comprising the composite layer of ceramic / polyaramid fibers 32 is heat resistant at 1,650 ° C. during a very short time of explosion, enabling protection against hot gases.

In another embodiment of the shoe 40, a layer of synthetic S-glass fibers may be added into the midsole or upper sole 14, 15 (see FIGS. 4, 4A, 4B).

Crowfoot or leno weave, with 70 to 90% arranged in the XY direction (vertical to the direction of the toe to the heel) and 10 to 30% from the toe to the heel A layer 41 of ceramic fibers of inch diameter may be embedded in the midsole on the polyaramid (Kevlar) fibers 18 (FIG. 4A). Alternatively, thin (0.025 inch) layers 42 of S-glass fibers, preferably having standard satin weave, may be embedded in the upper window 16 (FIG. 4B).

The sole 13 in combination with the layers of S-glass fibers 41 and 42 has a heat resistance of 815 ° C. during a very short time of explosion, enabling protection against hot gases.

Depending on the use and method of use of the present invention, the use and method of use may be apparent from the above description, and thus, further description of the use and use method of the present invention will be omitted.

In view of the foregoing, those skilled in the art will have the best specification relationships and materials for each component of the present invention to include variations in size, material, shape, shape, functional and operational methods, arrangements and uses. It is described to be easily, clearly and obviously understood by those skilled in the art, and all equivalents to those shown in the drawings and descriptions of the specification can be understood by the present invention.

Accordingly, the foregoing should be considered as merely illustrative of the principles of the invention. Moreover, because various modifications and variations can be readily made by those skilled in the art, the present invention is not limited to the precise structure and operation shown and described, and therefore all suitable modifications and equivalents are to the present invention. May be considered to fall within the scope of.

Claims (11)

Explosion and fragmentation, comprising a buried protective material, said protective material being buried through the entire shoe sole and consisting of at least one woven polyaramid (Kevlar) layer having a density of 15 oz or less per square yard. Polyurethane sole of polyester or polyether-based which is resistant to corrosion. The method of claim 1, And the buried protective material consists of one thick polyaramid (Kevlar) fabric layer having a thickness of at least 0.07 inch. The method of claim 2, Wherein said thick polyaramid layer is comprised of a bundle of crowfoot or lino woven polyaramid in which 70 to 90% is arranged in the X-Y direction and 10 to 30% is arranged in the heel direction at the toe. The method of claim 1, Wherein said buried protective material is bonded to each other by a polyurethane material and comprises at least three polyaramid (Kevlar) fabric layers, each layer having a thickness of 0.06 inches or less. The method according to any one of the preceding claims, The shoe sole, characterized in that the poly aramid fibers comprising the poly aramid (Kevlar) layers are mixed with polyester (PET) fibers. The method according to any one of the preceding claims, Wherein said polyaramid fibers are thinly coated with polyester and / or polyether-based polyurethane prior to weaving. The method according to any one of the preceding claims, Wherein the polyaramid fibers comprising the polyaramid (Kevlar) layers are blended with carbon graphite fibers. The method according to any one of claims 1 to 6, And the buried protective material comprises at least one layer of carbon graphite fibers. The method according to any one of the preceding claims, Wherein said buried protective material comprises a layer of at least one mineral fiber. The method of claim 9, The shoe sole, characterized in that the mineral fiber is composed of ceramic fibers. The method of claim 9, The shoe sole, characterized in that the mineral fiber is composed of S-glass fibers.