JPS5829082B2 - Method for manufacturing footwear covers made of synthetic resin leather - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a breathable footwear cover made of synthetic resin leather by injection molding of synthetic resin.

Footwear covers are generally made of cloth, natural leather, or synthetic resin leather.

In recent years, synthetic resin leather materials called artificial leather 2 (synthetic leather), which are made by laminating synthetic resin and base sheets such as fabric or nonwoven fabric, have been increasingly used instead of particularly expensive natural leather.

This synthetic resin leather material has come to be required to have breathability in order to prevent stuffiness inside the shoe.

To meet this requirement, conventional synthetic resins have been made with perforations such as needle embossing and electron beam shots after the lamination process (calendering method, topping method, etc.) of the synthetic resin and the base sheet to create ventilation holes. It manufactured leather materials.

However, this method not only increases the amount of work due to the additional step of drilling, but also requires a large investment in equipment.

The first object of the present invention is to provide a method for manufacturing a breathable footwear cover made of synthetic resin leather that fundamentally solves these drawbacks and allows the formation of ventilation holes in an extremely simple process.

Also, in recent years there has been a sports boom and the hobbies of users have diversified.

Due to the trend toward luxury, footwear materials with elaborate designs such as natural leather patterns, buckskin-like patterns, and various decorative materials on the surface have become required.

Conventionally, in order to reveal various decorations on the cover,
Design pieces made by cutting appropriate materials such as natural leather, buckskin materials, colorful cloth materials, or synthetic resin materials into arbitrary design pieces were sewn onto the cover material or adhered with adhesive.

If the cover material is synthetic resin leather that can be processed by high frequency dielectric processing, the design piece should also be made of a material that can be processed by high frequency dielectric processing.
There has also been a method in which a design piece is placed on a piece of material and is bonded together by applying high-frequency dielectric power.

However, in either method, the design piece must be procured separately from the main body, and additional processes such as sewing and high-frequency dielectric power processing are required, which is very time-consuming. Ta.

A second object of the present invention is to provide a manufacturing method that eliminates all such mechanical steps and exhibits excellent design effects through simple steps.

The present invention includes a first step of placing a base sheet in a recessed part of a mold, closing the mold, and bringing a presser pin into contact with at least a vent forming area on the base sheet to mold the base sheet. A synthetic resin comprising: a second step of fixing it in a mold recess and forming a molding cavity; and a third step of injecting and filling the synthetic resin into the molding cavity and integrally molding the synthetic resin and a base sheet. A method of manufacturing a breathable footwear cover made of leather.

The mold used in the present invention is best a commonly used metal mold, but a synthetic resin mold or the like may also be used.

Furthermore, the mold consists of a split mold that can be divided into a plurality of parts, and from the viewpoint of practical workability, it is preferable to use a split mold.

Further, a core may be used on the inner surface of the mold.

In this case, the core can be made of metal or synthetic resin, but nickel cores and copper cores are particularly suitable for cores with precise patterns formed by electroforming.

The presser pin in the present invention may be attached to the inner surface of the mold, or if a core is used, the presser pin may be attached to the core, or the presser pin may be attached to the inner surface of the mold, and the presser pin corresponds to the presser pin. A hole may be made in the part of the core to allow the presser pin to pass through.

The cross-sectional shape, size, and mounting position of the presser pin should be determined with consideration to ventilation performance as well as the design of the cover.

The base sheet that can be used in the present invention includes woven fabrics, nonwoven fabrics,
Knitted fabrics are suitable.

Further, as the synthetic resin to be injected, thermoplastic synthetic resins and thermosetting synthetic resins can be used, and typical examples include polyvinyl chloride resin, polyurethane resin, and acrylic resin.

As described above, the present invention has excellent features as described below.

■ Conventionally, vent holes were formed by performing perforation methods such as electron beam shot or needle embossing after manufacturing synthetic resin leather, but in the present invention, during manufacturing synthetic resin leather, in other words, presser pins are inserted into the base sheet. The ventilation hole can be easily formed by the step of bringing it into contact with the ventilation hole formation site.

In addition to these vent holes, if you want holes such as eyelets on the surface of the footwear, by placing a presser pin in that position, a mark hole for forming the eyelets etc. will be formed at the same time as the footwear is formed. can.

In addition, if the presser pin is also located at the periphery of the footwear,
Since the base material sheet is fixed more firmly, there is no risk of it turning up or bending due to the injection pressure of the injected synthetic resin, and the holes of the presser pins also allow the bonding of the footwear cover and the sole of the shoe. The degree of adhesion is further strengthened by the anchoring effect.

Furthermore, since a cut is purposely made at a certain position on the circumferential edge of the sleeve as a kind of mark, if a presser pin is also set at a certain position, it will also serve as a mark.

■ Conventionally, synthetic resin leather was obtained by laminating a base sheet and a rolled synthetic resin sheet using a calendering method, a topping method, etc., but it is extremely easy to obtain synthetic resin leather simply by injection molding the rolled synthetic resin. Leather can be obtained and the cost is also low.

Further, since the molding gap of the mold can be easily set to any shape, any design such as a decorative tape pattern, an eyelet pattern, a buckskin-like pattern, etc. can be easily formed on the surface of the cover.

An even more significant feature is that the coating is obtained by injection molding into a mold, so it is extremely easy to obtain variations in the thickness of the coating surface and large uneven patterns, which were difficult with conventional methods. .

In addition, in the present invention, especially when a core is used on the inner surface of the mold, various designs can be formed on the surface of the core, so that the shape and surface pattern of the core can be changed by simply replacing the core. Since it is possible to change the cover design, it is possible to change the cover design at a low cost.

Furthermore, since the core can have a precise pattern created by electroforming, the pattern on the surface of the core can also be very precise, giving the impression of a high-class product.

An embodiment of the present invention will be described below based on the drawings.

As shown in FIG. 1, the mold has a structure in which a back side mold 1 and a back side mold core 2 are fitted into the back side mold 1, forming a recessed part 14 on which the base sheet 3 is placed. A back side mold with a shape of
The front mold core 16 is fitted therein, and the front mold core 16 is provided with a presser pin 5 for fixing the base sheet 3.
, 5' are attached to the front side mold, and when the back side mold and the front side mold are closed, a molding cavity 6 is formed which forms a convex shape.

Note that the holding pins 5, 5' are positioned at least in the portion where the ventilation hole is to be formed.

Using such a mold, as a first step, as shown in FIG.
The base sheet 3, which has been cut into a concave shape, is placed in the recessed portion 14 formed.

As a second step, as shown in FIG. 1, the front side mold 4 in which the front mold core 16 with presser pins 5, 5' are fitted is fitted, and the mold is closed.

In this way, the base sheet 3 is pressed and fixed onto the back side mold core 2 by the presser pins 5.51 attached to the front side mold core 16.

At the same time, the concave portion of the back side mold 1 and the concave portion of the front side mold 4 form a concave molding cavity 6 having a concave shape.

As a third step, as shown in FIG. 1C, a fluid synthetic resin 8 is injected and filled into the molding cavity 6 from the injection hole 7 using an injection machine 9, and the synthetic resin 8 and the base sheet 3 are integrally formed. By shaping, it is possible to obtain a footwear cover made of synthetic resin leather in which the synthetic resin 8 and the base sheet 3 are laminated together and have ventilation holes.

As shown in FIG. 2, the footwear cover obtained by this method has not only ventilation holes 11 that also serve as designs, but also eyelets 12, decorative tape-like patterns 13, eyelet patterns 15, and buckskin-like patterns 14. It had a high added value.

[Brief explanation of drawings]

Figures 1a, b, and c are explanatory diagrams showing embodiments of the present invention;
FIG. 2 is a partially cutaway plan view of an example of a cover obtained by the present invention. 1...Mold on the back side of the cover, 2...Mold core on the back side of the cover, 3...Base sheet, 4...
...Front side mold, 5, 5'... Presser pin, 6... Molding cavity, 8... Injection synthetic resin, 11...・Vent hole, 16...
Front side mold core.

Claims (1)

[Claims] 1. The first step of placing the base sheet in the recessed part of the mold,
a second step of closing the mold, fixing the base sheet in the concave part of the mold by bringing a presser pin into contact with at least the vent forming part on the base sheet, and forming a molding cavity; A method for producing a breathable footwear cover made from synthetic resin leather, comprising the steps of: injecting and filling a synthetic resin into a molded cavity, and integrally molding the synthetic resin and a base sheet.