JPH05320363A - Method for molding shoe member having marble pattern - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a shoe member having a marble pattern (3 ') with a clear boundary at a low cost by a simple method. [Structure] Colored and sheeted rubber-like plastic (2) 1 having a higher softening point than 100 parts by weight of the sheet-crosslinked transparent rubber-like plastic (1). ~
Add 30 parts by weight. These are kneaded at a temperature equal to or lower than the softening point of the colored rubber-like plastic, and the dough is discharged and sheeted. The sheet (3) thus formed is cut and heat-crosslinked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding a shoe member having a marble pattern.

[0002]

2. Description of the Related Art Heretofore, according to Japanese Utility Model Publication No. 34-18648, several kinds of pelletized rubber materials having an appropriate color are mixed in an amorphous form, and the mixture is heated and pressed to crosslink and form a shoe having a marble pattern. A molding method has been proposed. However, since different color rubber pellets must be prepared, the molding process is complicated and the cost is high, and because the different color rubber pellets flow and fuse with each other when heated and pressed, the boundaries are unclear and blurred in color. There was a drawback that you could only get the soles.

[0003]

SUMMARY OF THE INVENTION According to the present invention, a shoe sole, a peripheral tape, a heel reinforcing piece, having a marble pattern with sharp boundaries,
An object of the present invention is to provide a shoe member such as a toe reinforcement piece or a rubber boot piece of boots by a simple method at a low cost.

[0004]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the drawings showing the embodiment of the present invention. The present invention is based on 100 parts by weight of a sheet-crosslinked transparent rubber-like plastic material which is crosslinkable. 1 to 30 parts by weight of a crosslinked, colored and crosslinkable rubber-like plastic having a high softening point is added, and the mixture is kneaded at a temperature equal to or lower than the softening point of the colored rubber-like plastic to give dough-forming sheeting. The subject of the present invention is a method for molding a shoe member having a marble pattern, which is characterized by cutting and heat-crosslinking this.

In the present invention, the crosslinkable transparent rubber-like plastics include natural rubber, SBR, BR, IR, NBR and C.
Transparent rubber plastics obtained by adding transparent fillers such as magnesium carbonate and white carbon, plasticizers or softeners, cross-linking agents, and other common rubber compounding chemicals to synthetic rubbers such as R, EPT, and EPDM. PVC, EVA, PE, 1.2
It is composed of a soft blended elastic plastic obtained by adding a crosslinking agent to a transparent thermoplastic resin such as polybutadiene.

In the present invention, the colored rubber-like plastic is compounded to have a high softening point of 10 ° C. or higher, preferably 20 ° C. or higher than the transparent rubber-like plastic. When the temperature difference is less than that, when kneading and sheeting, the colored rubber-like plastic is fused into the crosslinkable transparent rubber-like plastic due to self-heating, and the transparency of the transparent rubber-like plastic is transparent. And the depth of the marble pattern is lost.
When the colored rubber-like plastics are mainly composed of rubber-based plastics, the temperature difference is reduced by reducing the amount of the plasticizer or softening agent in the compound, as compared with the above-mentioned crosslinkable transparent rubber-like plastics. However, when it is composed of a colorant and other commonly used chemical additives for rubber and is composed of an elastic plastic compound of soft compounding, the transparency mainly composed of PVC, EVA, PE and 1.2 polybutadiene described above. Compared to the elastic plastics of
In the case of PVC and EVA having a higher degree of polymerization, EVA and PE having a lower vinyl acetate content, in the case of 1.2 polybutadiene, a PE having a higher crystallinity,
1.2 Polybutadiene as a main component, to which a colorant and, if necessary, a crosslinking agent are added. The crosslinkable transparent rubber-like plastics and the colored rubber-like plastics thus prepared were separately processed by a Banbury mixer, a Henschel mixer, a mixin roll, a kneader, etc. Uniformly mixed and sheeted.

The Banbury mixer and Henschel mixer are used in a ratio of 1 to 30 parts by weight of the colored rubber-like plastic to 100 parts by weight of the crosslinkable transparent rubber-like plastic thus sheeted. -, Mixin-gall, kneader
It is mixed at a temperature below the softening point of the rubber-like plastics colored by, etc., and the dough is taken out and sheeted, shoe sole shape, peripheral taper shape, heel reinforcement piece, toe reinforcement piece, boots rubber piece, etc. It is cut into the shape of, and is attached to the application part of the shoe in the step of assembling the shoe and heat-crosslinked. In the case of a shoe sole, a material cut into a shoe sole shape may be attached to a shoe as a shoe sole that is crosslinked by heating and pressing in a shoe sole mold. When the shoe sole is heated and pressed in the shoe sole mold, a burr groove is provided in the mold to allow the shoe sole material to flow in a direction so that it flows in a certain direction in a marble pattern. It is also possible to give a linear direction. Also, by stacking the shoe sole material in multiple layers and heating and pressing in a shoe sole molding die, the marble pattern can be formed in multiple layers in the shoe sole and a deeper marble pattern can be obtained. In the present invention, a crosslinkable transparent rubber-like plastic material 10
1 to 30 parts by weight of the colored rubber-like plastic material was added to 0 parts by weight, because if the amount of the colored rubber-like plastic material added was less than that, the addition amount was too small and the pattern was marble. However, if the amount of addition is more than that, the transparent parts in the molded product become too small, and the pattern becomes too flat and the depth is lost.

[0008]

As described above, the crosslinkable transparent rubber-like plastic material sheeted and the sheet-colored rubber-like plastic material sheet are softened by the crosslinkable colored rubber-like plastic material sheet. Since the dough is mixed and kneaded at a temperature below the point,
At the time of kneading sheeting, the colored rubber-like plastic is kneaded and dispersed without mutual compatibility with the crosslinkable transparent rubber-like plastic, and at the time of sheeting, the rolling direction is maintained while maintaining the aggregated state. To form a marble pattern. Since this mable pattern is irregularly formed in multiple layers in the crosslinkable transparent rubber-like plastic, it can be seen through the surface of the shoe member as a three-dimensionally deep mable pattern. .. The shoe member formed in this manner is crosslinked by heating, and the colored rubber-like plastic is fixed in a transparent rubber-like plastic as a marble pattern to enhance its mechanical strength and durability. It is an excellent shoe member. Further, it is not necessary to pelletize the colored rubber-like plastic material, and the sheet is sewn, and the transparent rubber-like plastic material and the colored rubber-like plastic material are kneaded, and the dough is simply put out in a sheet form. Therefore, the cost is low.

[0009]

EXAMPLE 1 A crosslinkable sheet-like rubber-like plastic 1 having a softening temperature of 40 ° C. and a cross-linking sheet-like rubber-like plastic 1 having a softening temperature of 40 ° C. and a softening point of 90 ℃
20 parts by weight of the colored rubber-like plastic material to 100 parts by weight of the transparent rubber-like plastic material and the cross-linkable sheet-like rubber-like plastic material 2 containing EVA as a main component. Kneading for 5 minutes at 40 ° C with a mixin roll and cutting a sheet 3 into a shoe sole shape by sheeting to a thickness of 3 mm, and stacking two sheets of this sheet 3 with a shoe sole molding die at 150 ° C at 100 kg / cm. ² was heated and pressed for 8 minutes to mold-crosslink the sole having the marble pattern 3 '. Thus, the shoe sole desired by the present invention can be obtained.

[Brief description of drawings]

FIG. 1 is a process drawing showing a method for molding a shoe sole having a marble pattern in an embodiment of the present invention.

FIG. 2 is a cross-sectional view of essential parts showing a step of crosslinking a shoe sole.

[Explanation of symbols]

1. Transparent rubber plastic 2. Colored rubbery plastic 3. Sheet 3'Mable pattern Table 1

Claims (1)

[Claims] 1. 1 to 30 parts by weight of a colored and sheeted rubber-like plastic having a higher softening point than 100 parts by weight of a sheet-crosslinked transparent rubber-like plastic which is crosslinkable. Addition and kneading at a temperature below the softening point of the colored rubber-like plastic material to form a dough-forming sheet, which is then cut and heat-crosslinked to form a shoe member having a mable pattern. Molding method