COMPREHENSIVE WRAPPING AND WATERPROOF SNOW BOOTS AND PRODUCTION PROCESS THEREOF

Comprehensive wrapping and waterproof snow boots and a production process thereof are provided. Each boot comprises an upper, a shell and a sole, wherein the shell is connected with the sole, and the shell covers the surface of the upper; the upper is composed of an inner bootie and a vamp for preventing water and siphoning; and the upper is connected with the sole and the shell by a PU bridging layer. The making process is simple and can omit a sole laying procedure and an upper-shell assembly procedure; the inner bootie enables the upper and the sole to be completely attached to a last, realizes good wearing comfort and barefoot feeling, achieves maximum sports shock absorbing and assisting function and comfortably wraps the foot. By reducing EVA & RB materials and increasing PU material, the dissolution proportion of the boots is increased, and the snow boots are more environment-friendly.

FIELD OF THE INVENTION

The present invention relates to a pair of snow boots and a production process thereof, and particularly relates to a pair of comprehensive wrapping and environment-friendly snow boots and a production process thereof.

BACKGROUND OF THE INVENTION

With the requirement of customers for performance promotion of products, current traditional snow boots with incomplete waterproof performance under many conditions increasingly bother customers. The uppers and the shells of the traditional snow boots are stitched by adopting a stitching machine all the time during combination, and water seeps in the presence of needle holes, so that the snow boots are poor in water-proof and cold-proof performance under some conditions, meanwhile, the stitching procedure of the stitching machine is complex and time-consuming and needs to be accomplished by professional technicians, so the production efficiency is low.

In addition, the snow boots in the current market are mostly equipped with thick foot covers for replacing insoles, the foot covers are high in flexibility and difficult to set, and the top surfaces of the soles of the snow boots are mostly of planar structures, so that the foot covers of most snow boots at present are difficult in fitting the feet, the feet are not wrapped ideally; and the requirement for comfort is difficult to meet. Moreover, the shock absorbing performance of the foot covers is not obvious, the shock absorbing performance of snow boots mainly depends on thick soles, and the dissolubility of the foaming material and the rubber material for the soles is not ideal, so the environment friendliness is not ideal.

SUMMARY OF THE INVENTION

The present invention provides a pair of comprehensive wrapping and waterproof snow boots for solving the problems that most existing snow boots cannot wrap the feet in an excellent state and the environment friendliness is poor.

The present invention adopts the following technical solutions:

A pair of comprehensive wrapping and waterproof snow boots, each including an upper, a shell and a sole, wherein the shell is connected with the sole into a whole, and the shell covers the surface of the upper. The upper is composed of an inner bootie and a vamp, and the vamp is the one for preventing water and siphoning. The shell and the sole form a PU bridging layer by one-step injection molding, a rubber sole sheet is arranged on the bottom surface of the sole, and the upper is connected with the sole sheet into a whole by the PU bridging layer.

More specifically, a making process for the comprehensive wrapping and waterproof snow boots includes: making an upper according to a traditional process; then wrapping a last with the upper according to a traditional molding process, putting the wrapped upper onto a PU injection molding machine, putting a rubber sole sheet into a sole mold, and debugging the sole mold to a matching and no-leaking state; performing one-step injection after the mold is closed to obtain a PU bridging layer formed by the shell and the sole, then transferring the mold to a heating box, heating the mold to 60˜80° C., foaming and curing the material for 5˜10 minutes, transferring the mold to a cooling box of −10˜0° C., and rapidly cooling the mold for 2˜5 minutes; and trimming burrs after de-molding, thus obtaining a finished snow boot product.

A pair of comprehensive wrapping and waterproof snow boots, each including an upper, a shell and a sole, wherein the shell is connected with the sole into a whole, and the shell covers the surface of the upper. The upper is composed of an inner bootie and a vamp, and the vamp is the one for preventing water and siphoning. The upper is connected with the sole and the shell into a whole by a PU bridging layer.

The inner bootie is composed of a lining and an inner pad which is formed by one-step injection molding, and the lining and the inner pad are connected into a whole by injection molding; the collar of the inner bootie is fixedly connected with the collar of the vamp, the lower edge of the vamp extends to the bottom surface of the inner pad and is fixedly connected with the inner pad, and the PU bridging layer wraps the lower edge of the vamp.

The thickness of the inner pad is 10˜20 mm.

The lining is of a foot cover structure in a sock shape.

The lining is made of a warm and/or breathable fabric.

The inner pad is a PU inner pad made of a PU material, or a popcorn inner pad made of mixed PU and TPU popcorn particles.

More specifically, a making process for the comprehensive wrapping and waterproof snow boots sequentially includes the following steps:

a. inner bootie: making a 1:1 mold kernel according to the foot shape, covering the mold kernel with a lining and conveying the mold kernel to a specified station of an injection mold; then pouring a RI raw material or a PU and TPU particle mixture into the mold cavity; transferring the mold to a heating box, heating the mold to 60˜80° C., transferring the mold after 4˜8 minutes to a cooling box of −10˜0° C., and rapidly cooling the mold for 2˜5 minutes; thus obtaining the inner bootie after de-molding;

b. upper: stitching the collar of the inner bootie with the collar of a vamp using a stitching machine according to the collar radian, and then covering the inner bootie with the vamp to obtain the upper; and

c. molding: wrapping a last with the upper according to a traditional molding process, then putting the wrapped upper onto a PU injection molding machine, and debugging a sole mold to a matching and no-leaking state; beginning injection after the mold is closed to make a PU bridging layer, then transferring the mold to the heating box, heating the mold to 60˜80° C., foaming and curing the material for 5˜10 minutes, transferring the mold to the cooling box of −10˜8° C., and rapidly cooling the mold for 2˜5 minutes; and trimming burrs after de-molding, thus obtaining a finished snow boot product.

It can be known from the above structural description of the present invention that compared with the prior art, the present invention has the following advantages:

1. The snow boot making process of the present invention is simpler than the traditional shoe making process, and can omit a sole laying procedure and an assembly procedure of the upper and the shell.

2. The mold kernel is designed and made according to the foot shape of human mechanics, and the inner bootie is made by an integral molding process in the mold, so that the foot can be placed in a most comfortable and matchable space, and the forefoot to the heel is perfectly wrapped; and the upper and the sole are completely attached to the last, so that the wearing comfort is very good and then a barefoot feeling is realized.

3. By changing the thickness, density, hardness and wrapping property of the inner pad according to different sports functions, the inner bootie achieves a maximum sports shock absorbing and assisting function and comfortably wraps the foot.

4. Manual sole laying is not needed, so that the processing efficiency is effectively improved, the problems of glue overflow, glue insufficiency and the like caused by manual sole laying are solved, and the upper is very clean and good in pull; and no glued layer exists between the upper and the sole, so that the elasticity of the sole is guaranteed.

5. The thickness 1˜3 mm of the foot cover is adjusted to the thickness 10˜20 mm of the inner pad of the present invention by adjusting the radian of the keel of the PU mold, and the thicknesses of the EVA sole and the RB sole sheet are reduced, so that the elasticity and the comfort of the feet in the moving process are greatly strengthened; and by reducing the consumption of EVA and RB materials and increasing the consumption of the PU material, the dissolution proportion of a pair of shoes is increased, the environment-friendly function is effectively promoted, the weight of the snow boots is also reduced, and the snow boots are more comfortable to wear.

DETAILED DESCRIPTION OF THE EMBODIMENTS

SeeFIG. 1andFIG. 2, a pair of comprehensive wrapping and waterproof snow boots, each including an upper1, a shell2and a sole3, wherein the shell2is connected with the sole3into a whole, and the shell2covers the surface of the upper1. The upper1is composed of an inner bootie11and a vamp12, the vamp12is the one for preventing water and siphoning, the inner bootie11is of a thick foot cover structure, and a filling material13for preventing cold, absorbing shock and the like can be filled between the inner bootie11and the vamp12. The shell2and the sole3form a PU bridging layer4by one-step injection molding, a rubber sole sheet5is arranged on the bottom surface of the sole3, and the upper1is connected with the sole sheet5into a whole by the PU bridging layer4.

More specifically, further seeFIG. 1andFIG. 2, a making process for the comprehensive wrapping and waterproof snow boots includes: making an upper1according to a traditional process; then wrapping a last with the upper1according to a traditional molding process, putting the wrapped upper1onto a PU injection molding machine, putting a rubber sole sheet5into a sole3mold, and debugging the sole3mold to a matching and no-leaking state; performing one-step injection after the mold is closed to obtain a PU bridging layer4formed by the shell2and the sole3, then transferring the mold to a heating box, heating the mold to 60˜80° C., foaming and curing the material for 5˜10 minutes, transferring the mold to a cooling box of −10˜0° C., and rapidly cooling the mold for 2˜5 minutes; and trimming burrs after de-molding, thus obtaining a finished snow boot product.

SeeFIG. 1andFIG. 3, a pair of comprehensive wrapping and waterproof snow boots, each including an upper1, a shell2and a sole3, wherein the shell2is connected with the sole3into a whole, and the shell2covers the surface of the upper1. SeeFIG. 1andFIG. 6, the upper1is composed of an inner bootie11and a vamp12, the vamp12is the one for preventing water and siphoning, and a filling material for preventing cold, absorbing shock and the like can be filled between the inner bootie11and the vamp12. The upper1is connected with the sole3and the shell2into a whole by a PU bridging layer4, the sole3is made of an EVA material, and the bottom of the sole3is fixedly connected with a rubber sole sheet5.

SeeFIG. 3,FIG. 4andFIG. 5, the inner bootie11is composed of a lining11aand an inner pad11bwhich is formed by one-step injection molding, and the lining11aand the inner pad11bare connected into a whole by injection molding; the thickness of the inner pad11bis 10˜20 mm, and the inner pad11bis a PU inner pad11bmade of a PU material or a popcorn inner pad11bmade of mixed PU and TPU popcorn particles; the lining11ais of a foot cover structure in a sock shape, and the lining11ais made of a warm and/or breathable fabric. The collar of the inner bootie11is fixedly connected with the collar of the vamp12, the lower edge of the vamp12extends to the bottom surface of the inner pad11band is fixedly connected with the inner pad11b,and the PU bridging layer4wraps the lower edge of the vamp12.

More specifically, further seeFIG. 1andFIG. 3toFIG. 6, a making process for the comprehensive wrapping and waterproof snow boots sequentially includes the following steps:

a. inner bootie11: making a 1:1 mold kernel6according to the foot shape, covering the mold kernel6with a lining11a,and conveying the mold kernel6to a specified station of an injection mold, wherein the shapes of the mold kernel6and the lining11acan be adjusted according to different foot shapes; then pouring a PU raw material or a PU and TPU particle mixture into the mold cavity; transferring the mold to a heating box, heating the mold to 60˜80° C., transferring the mold after 4˜8 minutes to a cooling box of −10˜0° C., and rapidly cooling the mold for 2˜5 minutes; thus obtaining the inner bootie11after de-molding;

b. upper1: stitching the collar of the inner bootie11with the collar of a vamp12using a stitching machine according to the collar radian, and then covering the inner bootie11with the vamp12to obtain the upper1; and

c. molding: wrapping a last with the upper1according to a traditional molding process, then putting the wrapped upper1onto a PU injection molding machine, and debugging a sole3mold to a matching and no-leaking state; beginning injection after the mold is closed to make a PU bridging layer4, then transferring the mold to the heating box, heating the mold to 60˜80° C., foaming and curing the material for 5˜10 minutes, transferring the mold to the cooling box of −10˜0° C., and rapidly cooling the mold for 2˜5 minutes; and trimming burrs after de-molding, thus obtaining a finished snow boot product.

The snow boot making process of the present invention is simpler than the traditional shoe making process, and can omit a sole laying procedure and an assembly procedure of the upper1and the shell2. Secondly, the mold kernel6is designed and made according to the foot shape of human mechanics, and the inner bootie11is made by an integral molding process in the mold, so that the foot can be placed in a most comfortable and matchable space, and the forefoot to the heel is perfectly wrapped; and the upper1and the sole3are completely attached to the last, so that the wearing comfort is very good and then a barefoot feeling is realized. Then, by changing the thickness, density, hardness and wrapping property of the inner pad11baccording to different sports functions, the inner bootie11achieves a maximum sports shock absorbing and assisting function and comfortably wraps the foot. In addition, manual sole laying is not needed, so that the processing efficiency is effectively improved, the problems of glue overflow, glue insufficiency and the like caused by manual sole laying are solved, and the upper1is very clean and good in pull; and no glued layer exists between the upper1and the sole3, so that the elasticity of the sole3is guaranteed. Moreover, the thickness 1˜3 mm of the foot cover is adjusted to the thickness 10˜20 mm of the inner pad11bof the present invention by adjusting the radian of the keel of the PU mold, and the thicknesses of the EVA sole3and the RB sole sheet5are reduced, so that the elasticity and the comfort of the feet in the moving process are greatly strengthened; and by reducing the consumption of EVA and RB materials and increasing the consumption of the PU material, the dissolution proportion of a pair of shoes is increased, the environment-friendly function is effectively promoted, the weight of the snow boots is also reduced, and the snow boots are more comfortable to wear.

Described above are merely specific embodiments of the present invention, hut the design concept of the present invention is not limited thereto. All insubstantial modifications made to the present invention using the concept are the behaviors of infringing the protection scope of the present invention.