JPH0321163B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to a method for manufacturing hand-pasted cloth.

<Prior art> Conventionally, hand-applied cloth shoes are generally made by first covering the upper fabric and the insole over a shoe mold, and then sequentially attaching the toe cap (and sometimes the back cap), outsole, decorative tape, etc. It is manufactured through the following steps. In this case, shoe parts such as toe caps and back caps are conventionally made by forming unvulcanized rubber compounds into sheets using a calender roll machine.
This is usually manufactured using a roll cutting method in which the shoe is then cut into a predetermined shape. Conventionally, when attaching rubber toe caps, etc., adhesive is applied over the entire surface of one side of the toe cap, etc. and the corresponding part of the upper cloth surface, then allowed to dry for a while, and then the toe cap, etc. is attached. This was done by pasting it on the surface of the upper cloth and pressing it.

<Problems to be Solved by the Invention> However, sheet portion molding using calender rolls is generally a molding method that uses linear pressure and instantaneous pressure, so it is difficult to remove air from the rubber compound during molding. Therefore, conventionally, during the molding process of rubber sheets for toe caps, etc., defects such as air bubbles remaining inside the rubber sheet (so-called air depressions) and defects where air bubbles remain on the rubber sheet surface (so-called air flow) have occurred. This occurs frequently, resulting in a significant decrease in the yield of toe caps, etc. in the subsequent cutting process, and has the disadvantage that it may result in defective shoe products or downgrading to second-class products.

Furthermore, in the pasting process for toe caps, etc., in order to completely prevent peeling, adhesive has conventionally been applied to the entire surface of the upper fabric over an area slightly wider than the size of the toe cap, etc. For this reason, the adhesive remains protruding from the toe cap, etc. of the fabric shoe as a product, which poses a size problem in terms of appearance quality. Furthermore, in the past, it was necessary to carefully attach the rubber sheet toe cap, etc. to the part of the upper cloth surface where the adhesive was applied, that is, to minimize the amount of adhesive protruding. It took a long time to attach the tow caps, etc., and the efficiency of the work was very low.

The purpose of the present invention is to solve the above-mentioned problems, to eliminate defects such as air flow in shoe parts, to eliminate adhesive extrusion in cloth shoe products, and to greatly improve the workability of attaching upper materials. The purpose of the present invention is to provide a method for manufacturing hand-made cloth shoes.

<Means for Solving the Problems> The method for manufacturing hand-pasted cloth shoes of the present invention uses a multi-screw extruder to produce a multilayer rubber sheet of adhesive rubber and base rubber. Then, by punching or cutting out the rubber sheet, shoe parts such as toe caps and back caps having an adhesive rubber surface layer partially or entirely are made, and then the adhesive rubber surface layer of the shoe parts is formed by co-extrusion molding. It is characterized in that the side is attached to the surface of the upper fabric of cloth shoes.

A preferred manufacturing method of the present invention is to co-extrude a base rubber sheet in which a part of the sheet forms a multilayer together with adhesive rubber using a twin-screw extruder, and then By punching or cutting out the rubber sheet, toe caps having an adhesive rubber surface layer on the intumescent side, back caps having an adhesive rubber surface layer on the toe side, etc. are made, and these shoe parts are then bonded to cloth with a conventionally used adhesive. This method is to attach it to the upper surface of the shoe.

In the present invention, a multi-screw extruder with two or more screws is used to extrude the base rubber in the axial direction of the main screw of the extruder, and at the same time extrude the adhesive rubber in the axial direction of the other screws. A multilayer rubber sheet for shoe parts, preferably a sheet of the base rubber, a part of which forms a multilayer structure together with the adhesive rubber, is molded. Therefore, the extruder used in the present invention is required to be equipped with a die having a structure capable of molding such a multilayer rubber sheet.

Further, the base rubber used in the present invention preferably has a certain degree of unvulcanized viscosity, since extrusion molding can be carried out smoothly. As the base rubber, for example, styrene-
Butadiene-based or isoprene-based synthetic rubbers, preferably synthetic rubbers that are mainly composed of synthetic rubbers and partially blended with natural rubber, may be used. In addition, the adhesive rubber used in the present invention must exhibit an adhesive effect with the upper fabric of cloth shoes by compression bonding (or heat compression bonding), and must be compatible with the base rubber and adhesive. The better the quality, the better. For example, a rubber composition in which 10 to 40 parts by weight of liquid isoprene rubber (LIR) is added to 100 parts by weight of synthetic rubber composed of a conventional composition (Mooney viscosity ML ₁₊₄ (80°C) = 10 ~40) can be used. In addition, sulfur, accelerators, anti-aging agents, fillers, etc. used in common rubber compounds are added.

<Function> The manufacturing method of the present invention employs an extruder dispensing method in which a multilayer rubber sheet for each shoe component is produced by extrusion molding using a multi-screw extruder instead of the roll dispensing method. Generally, in extrusion molding, high pressure is continuously applied to the molding material throughout the molding time, so in the present invention, air can be completely removed during molding of the rubber sheet, thereby reducing air flow and air cavities. The occurrence of such defects can be effectively suppressed.

In addition, the manufacturing method of the present invention can also be used for an upper having an adhesive rubber surface layer partially or completely, such as a toe cap having an adhesive rubber layer at least on the peripheral edge opposite to the toe, or an adhesive rubber layer at least on the heel. In this method, a back cap is formed on the periphery on the opposite side and is attached to the upper surface. Therefore, when attaching shoe parts such as toe caps, it is not necessary to apply adhesive to the surface of the upper cloth corresponding to the shoe parts, so that, for example, in the case of toe caps, the adhesive is applied to the side opposite to the toe. The adhesive does not protrude beyond the periphery of the heel, and in the case of the back cap, the adhesive does not protrude beyond the periphery of the opposite side of the heel.
These shoe parts can be attached to the upper surface. In addition, shoe parts can be accurately attached to the specified surface of the upper fabric without adhesive overflowing, even without paying close attention to the adhesive application range as in the past, that is, even if the adhesive application accuracy is considerably low. can be worn,
Therefore, it is possible to significantly shorten the time required for pasting each shoe component.

<Example> Embodiments of the present invention will be described below with reference to the drawings.

This embodiment describes a case where it is applied to molding and pasting of toe caps, but the present invention is also applicable to molding and pasting of other shoe parts such as back caps and toe guards.
Needless to say, it can also be applied to pasting.

First, each material of the hand-pasted cloth shoe, ie, the upper cloth, the midsole, the toe cap, and the outsole, is prepared. The tow cap will be manufactured using the following steps. First, a twin-screw extruder (not shown) is prepared, and a base rubber compound (mainly styrene-butadiene synthetic rubber with some natural rubber mixed) and an adhesive rubber compound (synthetic rubber and liquid isoprene rubber
100:10~40 mixture) respectively into the extruder,
A multilayer rubber sheet 1 as shown in FIGS. 2a and 2b, that is, a rubber belt having a rectangular cross section in which base rubber 2 and adhesive rubber 3 are formed in multiple layers on one side, is coextruded. Subsequently, the rubber sheet 1 is punched to form a toe cap 4 in which an adhesive rubber surface layer 5 is formed on the peripheral edge on the side opposite to the toe. Conventionally, air defects occurred at a rate of about 10%, but in the toe cap 4 of the embodiment, there were no defects such as air flow or air depressions.
On the other hand, the upper cloth, the midsole, the outsole, etc. are each manufactured according to conventional methods.

Then, hand-stitched cloth shoes are manufactured through the steps shown in FIG. 1, for example. That is, first, the upper cloth and the insole are placed on a cloth shoe mold (hanging process), and then, as shown in FIG. 3, adhesive 6 is applied to the toe side surface of the upper cloth 7.
That is, the adhesive 6 is applied to the upper fabric surface corresponding to the portion of the toe cap 4 where the adhesive rubber layer 5 is not present, and then the adhesive 6 is dried for an appropriate period of time, and then the toe cap 4 is
The adhesive rubber layer 5 is pasted and pressed so that it is aligned with the surface of the upper cloth (Fig. 4). In this case, the accuracy of applying the adhesive could be lowered, and the pasting work could be done very quickly. Thereafter, the outsole 8, decorative tape 9, and toe guard 10 are sequentially pasted and crimped according to a conventional method, thereby completing the hand-applied cloth shoe 11 as shown in FIG. Hand-made cloth shoes 11
The adhesive 6 did not protrude beyond the toe cap 4 at all, and the appearance was excellent.

<Effects of the Invention> As explained above, the method for manufacturing hand-pasted cloth shoes of the present invention uses an extrusion molding method of rubber sheets, thereby making it possible to obtain shoe parts with almost no defects (air flow, etc.). The quality of cloth shoe products has improved, and by using a rubber sheet with an adhesive rubber layer at least on the periphery as the upper material, it is possible to manufacture hand-applied cloth shoes without adhesive extrusion, and the appearance quality of cloth shoes has been improved. As a result, the work of attaching the upper material can be done much more quickly than in the past, and the workability is significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing the entire manufacturing process of hand-pasted cloth shoes according to an embodiment of the present invention, and FIGS. 2a and b
1 is a front view and a sectional view showing a rubber sheet for toe caps produced by the method of the embodiment, FIGS. 3 and 4 are diagrams showing the process of pasting and crimping the toe cap by the method of the embodiment, and FIG. 5 is a rubber sheet manufactured by the method of the embodiment. FIG. 2 is a perspective view showing hand-made cloth shoes. In the figure, 1... Multilayer rubber sheet, 2... Base rubber, 3... Adhesive rubber, 4... Toe cap, 5
... Adhesive rubber surface layer, 7 ... Upper cloth.

Claims (1)

[Claims] 1. In manufacturing hand-pasted cloth shoes, a multi-screw extruder is used to co-extrude adhesive rubber and a cover rubber sheet of base rubber, and then the adhesive rubber surface is formed by punching or cutting out the rubber sheet. Manufacture of hand-applied cloth shoes, characterized in that a shoe part such as a toe cap having a layer partially or entirely is made, and then the adhesive rubber surface layer side of the shoe part is adhered to the upper surface of a cloth shoe. Method.