JPH0646902A - Molding method of anti-slip sole - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a shoe sole with excellent slip resistance and durability at room temperature that does not damage the floor surface and that has excellent slip resistance and durability below the freezing point, such as on a snowy surface or a frozen surface, at a low cost. [Structure] An unvulcanized rubber material 2 mixed with acrylic fibers 21.21 is set in a shoe sole mold 1 and heated and pressed. A part of the unvulcanized rubber material 2 is formed with a projection forming recess 11.11.
At the same time as the filling of the projection-forming recesses 11.11 ..., the inflow holes 12.12 ... In this way, a protrusion having a hardness of 45 to 65 degrees according to JIS K6301 is formed integrally with the shoe sole 3, and then the bottom portion 31 of the protrusion is formed.
.. are buffed to expose the acrylic fibers 21.21 ... on the bottom surface 310 of the protrusion.

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 slip resistant shoe sole.

[0002]

2. Description of the Related Art Conventionally, according to Japanese Utility Model Laid-Open No. 62-21904, after mixing glass fibers with unvulcanized rubber and rolling this, a suitable number of glass fibers oriented in the rolling direction are piled up. A shoe sole has been proposed in which an anti-slip piece cut in a direction perpendicular to the rolling direction is embedded and formed in the ground contact surface of the shoe sole so that the cut surface becomes the ground contact surface. In this shoe sole, the glass fibers interposed in the anti-slip shoes are arranged at right angles to the ground contact surface, so that a shoe sole with excellent anti-slip properties can be obtained, but molding of the anti-slip shoes is complicated and Since it has to be embedded in the shoe sole, there is a drawback that the cost increases.

[0003] Further, a glass fiber mold interposed in the sole of the shoe.
Since it has a very high hardness of 7 to 8, it has a drawback that the floor surface of tiles, marble, granite, etc. is easily scratched and slippery on a wet floor surface.

Further, conventionally, an unvulcanized rubber cloth mixed with hard fibers such as glass fibers is set in a shoe sole molding die having a large number of independent projection molding concave portions on the bottom surface thereof, and this is heated and pressed. It is generally known that a part of the unvulcanized rubber material is press-fitted into the projection-formed recess by press-fitting and filling a part of it into the projection-formed recess. At the time of filling, unvulcanized rubber dough that eliminates the escape area or air enclosed in the recess becomes a turbulent state in the recess and the flow direction is not fixed, and the unvulcanized rubber dough is filled in the recess. The hard fibers in the unvulcanized rubber dough filled in are irregularly scattered in a state where the directionality is not fixed, so in shoe soles with protrusions formed in this way, The slip resistance of the sole due to the dispersed hard fibers, It was not able throat expected.

[0005]

DISCLOSURE OF THE INVENTION The present invention provides a shoe sole which is excellent in anti-slip properties and durability below the freezing point such as on a snowy surface or a frozen surface without damaging the floor surface at room temperature and is inexpensive at a very simple method. Is to be provided to.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the accompanying drawings. According to the present invention, a large number of independent projection-forming concave portions 11.11 ... Having an inflow hole 12.12 ... A shoe sole mold 1 having a length of 0.
The unvulcanized rubber material 2 mixed with acrylic fibers 21.21 ... having a thickness of 1 mm to 10 mm and a thickness of 1 to 30 denier is set, and a part of the unvulcanized rubber material 2 is formed by heating and pressurizing the protrusion forming recess 11.11. The hardness according to JIS K6301 is 45 at the same time as the shoe sole 3 while being filled into the shoe sole 3 while being made to flow into the inflow hole 12.12 formed in the bottom surface of the projection molding concave portion.
After molding the projections 31.31 ... of 65 degrees, the bottoms 311.311 of the projections are buffed to expose the acrylic fibers 21.21 ... on the bottom surface 310 of the projections. The molding method is the gist of the invention.

In the present invention, the acrylic fiber is
Fibers formed of acrylonitrile homopolymer, acrylonitrile and vinyl acetate copolymer, and acrylonitrile and vinyl chloride copolymer are used. These acrylic fibers have flexibility as low as natural fibers and flexibility at room temperature, and have high rigidity as free as glass fibers at a freezing point. This often shows that the elongation load of the acrylic fiber has a large temperature dependency. Acrylic fiber
For example, in order to pull 1% denier fiber by 3%, a load of 1.6 g / d is required at room temperature of 20 ° C, but a load of 2.2 g / d is required at 0 ° C. If these acrylic fibers are surface-treated with a titanium-based coupling agent, a silane-based coupling agent, a fatty acid, a fatty acid metal salt, a fatty acid ester, etc., the adhesiveness and dispersibility with the vinyl chloride resin can be improved. You can

In the present invention, the projection forming recess 11.1
Although various shapes are conceivable, the side walls 110.110 ... at the bottom are narrowed into a funnel shape to form the inflow hole 1.
If the unvulcanized rubber material 2 is press-filled into the protrusion molding concave portions 11.11 ... When the shoe sole 3 is molded, the funnel-shaped side walls 110.110 ... serve as guide walls. Thus, the flow direction of the unvulcanized rubber material 2 in the projection forming recesses 11.11 can be more accurately directed to the inflow holes 12.12. Therefore, the acrylic fibers 21.21 ... Dispersed in the protrusions 31.31 ...
Can be more accurately directed to the protruding direction of.
That is, the acrylic fibers 2 dispersed in the protrusions 31.31.
The orientation of 1.21 ... in the protruding direction of the projection 31.31 is further improved, and the slip resistance is further improved.

In the present invention, the unvulcanized rubber fabric 2 is natural rubber, isoprene rubber, butadiene rubber, styrene butadiene rubber, high styrene rubber, acrylonitrile rubber, chloroprene rubber, ethylene propylene rubber, chlorinated polyethylene, chloro sulfonated polyethylene. 1 or a mixture of two or more of them as a main component, to which acrylic fibers 21.21 ... having a length of 0.1 mm to 10 mm and a thickness of 1 to 30 denier and other common rubber compounding chemicals were added. JISK630 of shoe sole after molding
The blending is adjusted so that the hardness according to 1 becomes 45 to 65 degrees. If the hardness of the shoe sole 3 after molding is lower than that, it is too soft, and the compressibility of the protrusions 31.31 increases, and the acrylic fiber 2 is exposed on the bottom surface 310.310.
Since 1.21 is laid down due to the body weight of the wearer, the grip on the ground or the floor is deteriorated, the slip resistance is deteriorated, and the durability and comfort of the sole are deteriorated. Is more than that, the protrusion 31.
The compressibility of 31 ... becomes smaller and the bottom surface 310.310
This is because the acrylic fibers 21.21 exposed to the surface cannot be sufficiently projected from the bottom surface, the grip of the shoe sole 3 on the ground or the floor surface is reduced, and the slip resistance is deteriorated. From these points, it is more preferable to set the hardness of the shoe sole after molding according to JIS K6301 to 50 to 60 degrees.

In the present invention, the length of the acrylic fiber is limited to 0.1 mm to 10 mm and the thickness is limited to 1 to 30 denier, because the slipperiness of the shoe sole is reduced if the length and the thickness are less than that. If the length and the thickness are more than that, the fluidity of the unvulcanized rubber material 2 in the projection-forming recesses of the unvulcanized rubber material 2 is deteriorated, and the acrylic fiber 21 added therein is added. This is because the orientation of .21 ... deteriorates and the slip resistance of the obtained shoe sole 3 decreases. In this invention, the amount of acrylic fiber added is 100% rubber.
2 to 40 parts by weight is preferable with respect to parts by weight, and if the amount of the acrylic fibers 21.21 ... Is less than the above, the slip resistance of the obtained shoe sole tends to deteriorate, and the acrylic fibers 21.21. When the addition amount of the above is more than the above, the fluidity of the unvulcanized rubber material 2 at the time of molding the shoe sole 3 becomes poor, and the orientation of the acrylic fibers 21.21. There is a tendency that the slip resistance of the sole 3 is lowered. In the present invention, the unvulcanized rubber fabric 2 further contains conventional chemicals for rubber compounding such as a cross-linking agent, a cross-linking aid, a cross-linking accelerator, a filler, a pigment and a stabilizer, and if necessary, a foaming agent and the like. Then, the mixture was uniformly mixed by a mixer such as Banbury mixer, Henschel mixer, mixin roll, kneader, etc., and this was cut into appropriate shapes.

The unvulcanized rubber material 2 thus formed is set on the bottom of the mold 1 by a conventional method, and then heated and pressed, and a part of the unmolded rubber material 11.
1 is pressure-filled, but at this time, the air and excess surplus unvulcanized rubber material 2 enclosed in the projection molding recess 11.11 are flown into the inflow holes 12.12. The inflow of the unvulcanized rubber material 2 into the projection forming recesses 11.11 ... is from the upper part 111 to the lower part 11 of the recesses 11.11.
It will be smoothly carried out to 2 with a regular direction. Therefore, the acrylic fibers 21.21 ... Dispersed in the unvulcanized rubber material 2 filled in the recesses 11.11 are arranged substantially parallel to the inflow direction of the unvulcanized rubber material 2, That is, it is oriented. Therefore, the shoe sole 3 vulcanized and molded by heating and pressurizing in this manner has the bottom portion 311.31 of the protrusion.
If you remove 1 by buffing it with a grinder, etc.
1.31 ... Acrylic fiber 2 oriented vertically in the protrusion 31.31 during molding, that is, substantially perpendicular to the ground plane
1.21 ... Can be exposed on the bottom surface 310 of the protrusion 31.31.

[0012]

As described above, according to the present invention, the acrylic fibers 21.21 can be oriented in the protrusions 31.31 in the direction substantially perpendicular to the ground plane and exposed on the bottom surface by the extremely simple method. It is economically cheap because it can be done. Further, the protrusion 31.31 ... is appropriately compressed by body pressure during use, and the acrylic fiber 2 exposed on the bottom surface 310.310 ...
It is possible to project 1.21 ... to grip the ground or floor, and to obtain a shoe sole with excellent slip resistance. At room temperature, acrylic fiber 21.21 ... has the flexibility of natural fiber and does not damage the floor surface. At below freezing point, the acrylic fiber has the high rigidity of glass fiber, so that it sticks on ice and snow surfaces and freezes. You can exercise your sex.

[0013]

EXAMPLE 100 parts by weight of a rubber having a mixing ratio of natural rubber and styrene-butadiene rubber of 7: 3, acrylic fiber 21.21 ... 10 parts by weight having a length of 1 mm and a thickness of 2 denier,
An unvulcanized rubber material 2 was prepared by adding other commonly used chemicals for rubber compounding and a foaming agent, kneading the mixture with a kneading roll and rolling it to a thickness of 5 mm and cutting it. The foamed unvulcanized rubber fabric 2 thus prepared is provided with a funnel-shaped projection-forming concave portion 11.11 ... at the bottom and an inflow hole 12.12 ... Set it on the bottom mold 1 and fit the upper mold 4 on it to make 1 between the upper and lower press molds 5.5 '.
By heating and pressurizing at 50 ° C. and 30 kg / cm ² for 8 minutes, a foam-vulcanized shoe sole integrally formed with protrusions 31.31 ... The bottom portion 31 of the protrusion of the shoe sole molded in this way
1.311 ... and burrs 12 ′. Formed in the inflow holes 12.12. 12 'was removed by buffing with a grinder. The shoe sole thus obtained had the desired effects of the present invention.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing a shoe sole molded state.

FIG. 2 is a cross-sectional view of the essential parts of the shoe sole taken out from the molding die.

FIG. 3 is a sectional view of a main part of the completed shoe sole.

[Explanation of symbols]

 1. Mold 11 ... Recess 110 ... Side wall 111 ... Upper part 112 ... Lower part 12 ... Inflow hole 12 '... Burr 2. Unvulcanized rubber fabric 21 ... Acrylic fiber 3. Sole 31 ... Protrusion 310 ... Bottom 311 ... Bottom 4. Upper mold 5.5 '... Press mold

Claims (1)

[Claims] 1. An inflow hole 12.1 penetrating to the back surface on the bottom surface.
A large number of independent protrusion-forming recesses 11.11 ...
With a shoe sole mold 1 having a length of 0.1 mm to 10 mm
And acrylic fiber 21.21 with a thickness of 1 to 30 denier ...
The unvulcanized rubber material 2 mixed with is set, and a part of the unvulcanized rubber material 2 is protruded by heating and pressurizing it.
The protrusion 3 having a hardness of 45 to 65 degrees according to JIS K6301 is integrated with the shoe sole 3 while being charged into the inflow hole 12.12.
After molding 1.31, the bottom of the protrusion 311.311 ...
Buffs the acrylic fiber 21.
21 is exposed, and a method for forming a slip-resistant shoe sole.