JP3798074B2 - Waterproof shoes - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a waterproof shoe, and is provided with a waterproof function part in the region from the vicinity of the cord thread stitching at the lower end edge of the back cover layer to the position where the insole material is disposed, and the shoe bottom part is joined and integrated by injection molding Regarding shoes.
[0002]
[Prior art]
Conventionally, waterproof shoes are made by thickly applying a rubber or synthetic resin glue layer between the skin and the back cloth of the heel cover cloth, or by attaching a rubber or synthetic resin sheet between the front cloth and the back cloth. What is pasted on one sag is used. Further, as waterproof shoes, shoes using waterproof materials such as total rubber shoes, slash-molded shoes, injection boots, rubber boots, leather, synthetic leather, etc. are known. The skins of these shoes are completely waterproof and impervious to water, but many of the materials are exposed as they are, and there are problems such as inferior touch of the skin material and heavy weight. For this reason, in recent years, the appearance, texture, etc. in line with the fashion of clothing are desired, so not only waterproof materials but also different materials are selected, or shoes with flocking on the surface are also available on the market Has been.
[0003]
[Problems to be solved by the invention]
The conventional technology as described above has the following problems. In the case of using a waterproof material such as rubber, vinyl chloride resin sheet, leather, synthetic leather, etc., the outer cover itself is completely waterproof and does not allow water to pass through. When the sewed cloth and the boots, such as boots, are constructed, it is immersed from the outside through the stitches and sewing thread of the sewing part of the stitched part, enters the foot area inside the shoe through the stitch material, That is, the seam material forms a water bridge by the centripetal action, or the needle insertion hole forms a water bridge by capillary action, resulting in incomplete waterproofing. Various measures have been taken to solve such problems.
[0004]
For example, in waterproof shoe covers, the main body of the cover that has been cut into a horseshoe shape is staggered with the buttocks located on the left and right sides facing each other, and heat is applied to the outside of the buttocks along the seams. A heat-sealed plastic synthetic resin tape or the like is known. However, the binding force at the end of the buttock is not necessarily strong and may cause water immersion. For this reason, it is not limited to a practically sufficient waterproof property, and is not limited to a skin covering made of a waterproof material, and a soft texture and weight reduction are required.
[0005]
For example, in Japanese Patent Application Laid-Open No. 7-222603, an upper and a bottom formed by bonding a top sheet obtained by cutting and sewing a plurality of top cloth pieces and a waterproof sheet, and bonding a back cloth to the inner surface of the waterproof sheet. In Japanese Patent Application Laid-Open No. 7-313206, a waterproof shoe with a joint is compressed by compressing the heels at both ends of the substantially horseshoe-shaped scabbard body so that the heel part ends are thin, and the overlapped heel part ends are sewn A shoe hood with a thermoplastic synthetic resin tape heat-sealed on the outside of the heel portion to prevent inundation, and Japanese Patent Application Laid-Open No. 6-277101 discloses an edge formed by foam molding by an inner sole and injection. There are various means to prevent water from entering the inside of the shoe, such as waterproof footwear that reliably prevents water from entering the inside of the shoe consisting of an outsole with a portion and a shaft covered with a waterproof layer. Although it is taken, it requires many processes and complicated composition, There is a difficulty in forming cost.
Furthermore, even by applying rubber glue to the stitched part or sticking rubber or synthetic resin tape on the back side, it is possible to cut a plurality of upper cloth pieces made of a water-permeable material and to sew the sheath to the upper part shape. In addition, it is configured through a process in which the upper part and the bottom part formed by pasting together the waterproof sheet and the upper and lower cloths are joined together, but it is difficult to completely prevent the water to be submerged.
[0006]
In view of the above-mentioned drawbacks of conventional waterproof shoes, the present invention is not particularly limited to the outer cover of a waterproof material, and a lightweight and reliable waterproof property can be obtained. Further, the present invention provides a waterproof shoe free from the risk of water immersion and water leakage, and the present invention provides a surface covering layer having a waterproof film layer having a water repellent finish on the surface, The lower end edge of the foamed urethane resin layer comprising at least the microporous body, having a middle core layer layered with a waterproof membrane layer adjacent to the outer cover layer and a back cover layer made of a foamed urethane resin layer A latex adhesive is applied to the area from the position near the cord thread stitching position to the horizontal height of the position where the midsole is disposed, and contact with a roller presser etc. in the non-adhesive state of the adhesive The latex adhesive is embedded, filled and fixed in the microporous gap of the urethane foam resin layer by pressing means. And a waterproof functional layer provided by bonding the sole by injection molding, and to obtain a waterproof shoe, characterized in that integrated.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, in the waterproof shoe of the present invention, (1) a surface covering material layer in which a waterproof film layer whose surface is subjected to water repellency is applied, and (2) the heel A latex adhesive in an embedding range that extends from the position near the cord thread stitching position at the lower end edge of the foamed urethane resin layer to the horizontal height of the arrangement position of the midsole material. (3) A waterproof functional layer in which the latex adhesive is embedded, fixed and fixed in the micropore space of the urethane foam resin layer by a contact pressing means such as a roller presser in a semi-cured state of the adhesive (4) The shoe sole is joined and integrated by injection molding to form a waterproof shoe.
[0008]
In the present invention, a high waterproof property can be obtained by applying water repellent or waterproofing to the outer surface of the outer cover. In the present invention, the outer surface of the outer cover is processed with at least a water repellent. It is necessary.
Examples of water repellents include fluorine-based water repellents mainly composed of polytetrafluoroethylene, perfluorooctyl acrylate, etc., and silicon-based water repellents mainly composed of dimethylal polysiloxane and methylhydroxysiloxane. , A pyridinium salt water repellent such as stearamide methyl pyridinium chloride and octadecyloxymethyl pyridinium chloride, or an ethylene urea water repellent, can be used alone or in combination of two or more. A water repellent is suitable.
Furthermore, in the water repellent treatment, the basis weight of these water repellents is usually about 0.5 to 2.0 g / m in terms of solid content, and the water repellency is 70 or more according to the JIS L-1092 method. Is appropriate.
[0009]
In the present invention, the latex adhesive is selected from one or two or more types mainly composed of natural rubber latex, styrene butadiene copolymer rubber latex, polyisoprene rubber latex, polybutadiene rubber latex, acrylonitrile butadiene copolymer rubber latex, and the like. A product obtained by kneading the product is used.
[0010]
For example, an adhesive in which MMA is graft copolymerized with natural rubber latex and pre-vulcanized with an organic peroxide to improve aging resistance, water resistance, and adhesion performance is preferable.
In the above-mentioned latex adhesive, a viscosity of 50 to 2,000,000 cps, preferably 50 to 5,000 cps, and a solid content of 40 to 80% is appropriate.
[0011]
The latex adhesive is dotted throughout the entire area of the urethane foam resin layer, which is the back cover layer, from the position near the bottom of the cord thread to the horizontal height of the position where the midsole is disposed. The latex adhesive applied to the foamed urethane resin layer is then dried to the extent that it does not adhere to the finger, i.e., linear, or a combination of linear and point, and relatively thick. In a non-tacky, semi-dry state that has not yet been completely dried, the latex adhesive is embedded in the micropore space inside the foamed urethane resin layer by a contact pressing means such as a roller press. In this way, a waterproof functional layer that is pressed, filled, embedded, and fixed is provided.
[0012]
As a form of embedding and fixing the latex adhesive applied to the foamed urethane resin layer into the foamed urethane resin layer, there are various forms such as a form in which the resin layer is uniformly pressed and contained throughout the embedding range of the resin layer, Although not particularly limited, it is appropriate that the material penetrates and is fixed to the inside at least uniformly.
[0013]
In the foamed urethane resin layer, the embedding range in which the latex adhesive is brought into contact and pressed is fixed at least by the arrangement of the midsole material 15 from the position near the cord suture at the lower end edge of the foamed urethane resin layer. The latex adhesive is applied over a region up to the horizontal height of the position, and the entire embedding range of the region is appropriate, but it may be a part, and if necessary, not only the back surface coating layer but also the lower end of the surface coating layer. Similarly, it is possible to set a desired embedding range without being limited by embedding and fixing to the edge portion or depending on the concavo-convex structure or height of the adjacent midsole.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
In the waterproof shoe of the present invention, in order to achieve the above object, (1) a surface covering layer having a waterproof film layer having a water repellent finish on the surface, and (2) the covering A latex adhesive is applied to an embedding range from at least a position near the cord thread stitching position of the lower end edge of the foamed urethane resin layer to a horizontal height of an arrangement position of the midsole. (3) In the semi-dry state where the adhesive is non-tacky, the latex adhesive was embedded and fixed in the micropores of the urethane foam resin layer by contact pressing means such as a roller press. A waterproof functional layer is provided, and (4) a shoe sole is joined and integrated by injection molding to form a waterproof shoe.
[0015]
In the present invention, at least a water repellent agent is applied to the outer surface of the outer cover, and in addition to water repellency, the waterproof property can be further improved, so that different materials can be freely selected without being limited to waterproof materials. It is possible to prevent capillary action or water bridge on the outer surface of the front cover, and to prevent water from entering the inside of the shoe from the front cover side. In addition, the waterproof functional layer formed in the embedded area of the back cover layer made of the urethane foam resin layer has a water bridge that is submerged from the outside through the sewing seam and sewing thread of the cover cover or stitched portion. It is more effective to provide a route and a so-called water tap at a part that can be closed, and the part in the present invention is a structure that satisfies this, and enters from the outside through a seam and a sewing thread, and is waterproof. It works to prevent it from becoming imperfect.
[0016]
【Example】
An embodiment of the present invention will be described below with reference to the drawings.
Example 1
FIG. 1 is a longitudinal cross-sectional explanatory view showing a waterproof function part in the waterproof shoe of the present invention, and FIG. 2 is a partially cut-out shoe bottom perspective explanatory view of the waterproof shoe of the present invention. The waterproof shoe 1 includes a surface covering layer 2 having a waterproof membrane layer attached to the inside and a core material layer 5 having a waterproof membrane layer attached to the outside of a canvas material or the like. The back surface covering layer 7 of the foamed urethane resin layer 6 having cushioning properties is attached to the inner side surface of the foot.
[0017]
The waterproof shoe 1 of the present invention includes the following first to fifth steps.
First step: Forming a surface covering layer 2 having a polyurethane resin film waterproof film layer 3 formed on the back side of the covering made of a polyurethane resin laser, dipping the covering layer 2 in a fluorine-based water repellent liquid, The surface covering layer 2 which performed the water-repellent process of the water-repellent degree 90 according to JISL-1092 method was formed after drying and water-repellent treatment.
Second process: A core material layer 5 in which a waterproof film layer 4 of a polyurethane resin film is bonded to a canvas material by a heat-sealing process, using the surface covering layer 2 subjected to the water repellent process and a latex adhesive. The surface covering layer 2 and the core material layer 5 were bonded together, and a sealing tape was attached.
Third step When a back cover made of a foamed urethane resin sheet is manufactured and adhered to the inside of the cover 13 as a part of the foamed urethane resin sheet, that is, the back cover, A latex adhesive mainly composed of natural rubber, having a viscosity of 50 to 5000 cps, a solid content of 60, in an embedding range L that extends from a position near the suture stitching position to a horizontal height at the position where the midsole 15 is disposed. %, And after applying to a thickness of 0.5 to 1.0 mm, the back cover layer 7 is provided with a waterproof functional layer 8 which is pressed, filled and fixed with a roll coater of a contact pressing tool. The inner core material layer 5 was bonded inside.
Fourth Step Next, the cord yarn 15 is hung on the periphery of the shoe rim, and the water-repellent yarn 11 is used as the water-repellent yarn 14, and the cord yarn 10 disposed in a circumferential state is used. The collar portion 13 is configured by sewing with rake stitching.
5th process After the said process completion, it was set as the structure which joined and integrated the shoe sole part 12 to this cover part 13 by injection molding.
[0018]
A waterproof shoe using the shoe cap obtained as described above was measured, and the waterproofness was measured and evaluated, and compared with a comparative example and a commercially available product, and examined.
[0019]
Comparative Example A comparative example of the shoe hood in the present invention is as follows.
Both the front cover and the back cover were set to the same cover as in Example 1, and the shoe product lacking the waterproof function part in Example 1 was used as a comparative example.
[0020]
The waterproof property was measured for both the shoe constructed from the shoe jacket of Example 1 of the present invention and the shoe constructed by the comparative example.
The measurement and evaluation of the performance of waterproof shoes in the examples were performed by the following methods.
Water resistance, test method Adopting the water check method, set a weight on each shoe product to be tested so that about 35-45mm can be immersed in water from the bottom of the shoe in a container filled with water. As a result of examining and comparing whether or not water has invaded from the inside every minute by a finger touch check, the following evaluation was made.
[0021]
(1) Comparative example, when a waterproof function part was not formed after molding, a wet state due to water intrusion after an average of 5 hours passed, and a wet state after 8 hours were confirmed.
(2) On the other hand, in the product of Example 1, even when a slightly wet feeling occurred after 6 hours, the same state was maintained even after at least 24 hours, and the wet state could not be confirmed.
In addition, in the product of Example 1 in which the waterproof function part is formed only on the heel after molding, the wet state is confirmed after about 5 hours, but the state is maintained for at least 7 hours and remains wet. Did not reach.
(3) Next, as a result of examining and comparing 11 commercial products, a product showing a wet state after about 2 to 3 hours on average, about 4 hours on average, and a wet state after about 5 hours was confirmed. Variations were observed in the evaluation of waterproofness or water repellent finish.
[0022]
Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above-described embodiment, and design changes and the like within a scope not departing from the gist of the present invention are also included in the present invention.
[0023]
【The invention's effect】
Since the present invention is configured as described above, (1) there is no risk of flooding due to the structure of the waterproof functional layer, and in combination with the application of water repellent treatment to the surface covering, Waterproof shoes that can be selected and expanded in design are possible. (2) In addition to requiring a water-repellent finish on the outer cover, it is simple with only an increase in the process of pressing and fixing the latex adhesive in the embedding area before the overlock process at the time of sewing, It is possible to provide a waterproof shoe that does not significantly change the conventional manufacturing procedure and handling contents and that does not require a large number of man-hours and prevents water from entering at low cost.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional explanatory view showing a waterproof function part in a waterproof shoe of the present invention.
FIG. 2 is a perspective view of the bottom of a partially cut shoe of the waterproof shoe of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Waterproof shoes 2 Surface covering layer 3 Waterproofing film layer 4 Waterproofing film layer 5 Core material layer 6 Foam urethane resin layer 7 Back surface covering layer 8 Waterproofing functional layer 9 Latex adhesive 10 Cord yarn 11 Water repellent yarn 12 Shoe sole 13 Cover part 14 Sewing thread 15 Middle sole material

Claims (2)

A surface covering layer having a water-repellent finish applied to the inside thereof, a core coating layer having a waterproof coating layer adjacent to the surface covering layer, and a urethane foam resin A latex adhesive in a region from at least a position near the cord thread stitching position at the lower end edge of the foamed urethane resin layer to a horizontal height at which the midsole is disposed. A waterproof functional layer is provided in which the latex adhesive is embedded and fixed in the micropore space of the urethane foam resin layer by contact pressing means such as a roller presser in the non-adhesive state of the adhesive. A waterproof shoe characterized in that the shoe sole is joined and integrated by injection molding. The latex adhesive is selected from one or two or more types mainly composed of natural rubber latex, styrene butadiene copolymer rubber latex, polyisoprene rubber latex, polybutadiene rubber latex, acrylonitrile butadiene copolymer rubber latex, and the like. The waterproof shoe according to claim 1.

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