JPS62161301A - Shoe sole having projections on earth contact surface thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a shoe sole for use as baseball shoes, soccer shoes, rug shoes, etc., in which a large number of protrusions made of a polymeric material are formed in place of spike pins on the ground sole.

(Prior Art) Conventionally, shoe soles in which protrusions made of a polymeric material are formed on the ground contact surface are generally made by molding and curing a single rubber or polyurethane composition in a mold.

Recently, shoes with soles in which the base sole and the protrusion are integrally molded from different colored materials or different types of materials have come on the market for design and performance reasons, but the concentrated load is placed on the protrusion. Therefore, there are problems such as the protrusions wear quickly and the protrusions easily break at the boundary with the bottom of the base, and an improvement is desired.

As a measure against wear on the protrusions, a pre-molded material made of abrasion resistant material is placed on the protrusions in areas of the sole that are susceptible to abrasion, while other areas are made of materials with low abrasion resistance. A method for integrating this is disclosed in Japanese Patent Application Laid-Open No. 60-15880.
It is proposed in No. 4. However, although this technology is extremely effective in improving the wear resistance of the protrusion, it still has the disadvantage that the boundary between the protrusion and the base bottom, that is, the root of the protrusion, is more likely to break due to impact. There were some drawbacks.

(Problems to be improved) This invention aims to improve the abrasion resistance of the protrusion, and also improves the wear resistance of the protrusions, and also improves the wear resistance of the protrusions. It is an object of the present invention to provide a sole having appropriate strength so that the protrusion does not break or peel off from the base even when subjected to repeated movements.

(Means for Solving the Problems) As a result of intensive research aimed at solving the above-mentioned problems, the inventors of the present invention have found that the base bottom has a relatively low hardness that is highly flexible due to its required functions. It is molded from a molecular material, and the protrusion is made of a laminated integral structure of two types of polymer materials with different hardnesses.

The side of the protrusion in contact with the base bottom is made of a polymeric material having a hardness approximately similar to that of the base bottom, and the contact surface side of the protrusion is made of a polymer material with a hardness higher than that of the base bottom or the root of the protrusion.

Moreover, by arranging wear-resistant polymer material,
It has been found that it is possible to prevent peeling and breakage at the boundary between the protrusion and the bottom of the base, and to significantly improve the abrasion durability of the ground contact part.

Polymer materials that can be used in this invention include rubber and synthetic resins. Specifically, natural rubber, styrene-butadiene-based rubber, polybutadiene-based rubber, polyisoprene-based rubber, nitrile-based rubber, polyurethane-based resin, polyamide-based resin, etc. are preferable, and these may be used alone or in combination. If necessary, polyvinyl resin, polyacrylic resin, metal, various reinforcing materials in the form of fibers, etc. can also be used in combination. It is particularly recommended to use rubber or urethane-based resin as the base sole material, and to use a rubber-based material as the protrusion material from various points of view such as elasticity, flexibility, abrasion resistance, and heat resistance.

The hardness relationship between the base bottom material, the root material of the protrusion, and the contact surface material of the protrusion is an important requirement of the present invention. In other words, the base bottom material and the protrusion root material are preferably made of the same material and have the same hardness, or are made of different materials and have the same hardness, but they do not necessarily have to be the same hardness, and may have a similar hardness range. Bye. The hardness range approximated here is J
It refers to a range of hardness difference of less than 5 degrees, preferably 1 to 3 degrees in terms of IS A hardness.

On the other hand, the hardness of the contact surface material of the protrusion needs to be higher than that of the base bottom material and the root material of the protrusion, and it is recommended that the hardness is desirably higher than the JIS A hardness by 5 degrees or more. The reason for providing this hardness difference is important from the perspective of the relationship with the wear resistance of the protrusions, which will be described below.

Shoes with protrusions on the ground surface 1 For example, in the case of baseball shoes, soccer shoes, etc., there are usually about 6 to 15 protrusions on each foot, but in this case, the total weight of a human being is only 12 to 15. It will be supported by 30 protrusions. When running, suddenly stopping, or suddenly changing running direction, the protrusions are subjected to a large load due to impact force and acceleration. For example, a concentrated load may be applied only to the protrusions on the inside of each foot, so the protrusions must be fairly hard from the standpoint of spike function, and the areas where they are used are natural turf or artificial turf. In addition, conditions vary depending on the hard soil of the ground, etc., so if these are taken into account, higher abrasion resistance and heat resistance are required.

In general, when it comes to the wear resistance of shoe soles, harder soles tend to wear more easily, while softer soles tend to wear less. It is presumed that this is because when a load is applied, the impact is alleviated by the elasticity of the polymer material during friction with the ground, and 100% of the applied load is not applied as a frictional force with the ground.

The sole of the present invention is designed based on the above reasoning, and is made of a low-hardness polymer material that approximates the base bottom side and base of the protrusion, and has a high-hardness polymer material on the contact surface of the protrusion. By disposing the polymer material, the sole has both the function of the protrusions as spikes and the shock-reducing function of the elastic base.

In this case, the dimensional ratio of the low-hardness polymeric material at the base of the protrusion to the high-hardness material at the ground-contacting part is 0.1 to 0.5 for the low-hardness portion when the overall height of the protrusion is 1. The hardness of the high hardness portion is preferably in the range of 0.5 to 0.9.

In addition, the low hardness portion between the base bottom and the base of the protrusion, and the low hardness portion and the high hardness portion may be joined by separately molded and hardened materials and bonded together using an adhesive, or by partially combining them. It is also possible to use a method of integrally molding the material. When only rubber is used as the polymer material, an integral molding method is to mold unvulcanized rubber into a high-hardness protrusion for grounding of the desired thickness, and then mold the base part to a thickness equivalent to 10 to 50% of the total thickness of the protrusion. A method of laminating and curing unvulcanized rubber with low hardness protrusions is recommended. In addition, in order to integrate with the base bottom, the vulcanization at this time should be in a slightly undercured state.
The most suitable method is to place this into the recess of a predetermined mold, laminate low hardness unvulcanized rubber for the base bottom molded to a desired shape and thickness, close the upper lid of the mold, and perform integral molding and vulcanization. In addition.

The polymer material of the protrusion may have a shape that is independent one by one, but it may also be prepared in the form of a plurality of connected polymer materials. If you change the color of the rubber depending on the hardness part, or depending on the position of the protrusion,
Multicolored soles can be obtained very easily. This makes it possible to obtain soles with excellent designs that vary in color and pattern.

(Example) , This invention will be specifically explained below with reference to Examples.

(Compound numbers represent parts.) Example 1 (A) Molding of protrusion material (Note) *1: SBR manufactured by Nippon Synthetic Rubber *2: High styrene rubber manufactured by Nippon Synthetic Rubber *3: Polybutadiene manufactured by Nippon Synthetic Rubber Rubber *4: Natural rubber R3S
No. 4 *5: Nibusil VN3 manufactured by Nippon Silica *6: Carbon black #80 Ne7 manufactured by Asahi Carbon: Carbon black #70 manufactured by Asahi Carbon *8: Swaflexz 100 manufactured by Maruzen Oil *9: Antigen TN manufactured by Sumitomo Chemical
P *10: Tsukurac MS-6 manufactured by Ohmukai Shinko Chemical *11: Tsukurac 224 manufactured by Ohmukai Shinko Chemical *12: Tsukusera F manufactured by Ohmukai Shinko Chemical *13: Amine-based activator *14: Tsukurac CZ manufactured by Ohmukai Shinko Chemical *15: Using the formulations listed in Table 1 of Ohmukai Shinko Kagaku Tsukusela TS, prepare kneaded doughs of T and ■, respectively, by the conventional blending roll mixing method, and from the tip of the protrusion to the root touching the bottom of the base. For the remaining 115 (3 mm) at the base, put the kneaded dough of composition I into a mold and press at 170°C for 5 minutes. The physical properties of formulations I and II after vulcanization are shown in Table 2.

(The following is a blank space) CB) Insert the protrusion material vulcanized and molded in the above (A) into the protrusion forming recess of the cavity of the mold for molding the footwear sole integrally formed with the base sole.

On top of this, kneaded rubber of the composition (1) listed in Table 3 was further filled to form the base bottom, and press vulcanization was performed at 145°C for 5 minutes. An integrally vulcanized adhesive molded sole was obtained. Incidentally, the vulcanized physical properties of the base bottom according to formulation (1) were as described in Table 4.

Example 2 The protrusion of a shoe sole having the protrusion obtained in Example 1 and the protrusion of a shoe sole having a protrusion molded from a single commercially available thermosetting urethane material were combined into the structure shown in FIG. Using a sandpaper set abrasion tester.

A load of 4.2 kg is applied to 4 protrusions at a speed of 5 per second.
．． 1 at speeds of 4m, 6m, 7.2+n, and 8.4m
The abrasion loss of the protrusion was measured when the sandpaper belt was run for 5 seconds, and the volume was converted using the specific gravity of both materials of the abrasion protrusion, and the two were compared. The results are shown in Table 5. be. In addition, the sandpaper should be replaced every time, as in Example 1.
The actual measured values of 1, 18, and 1.15 were used for the specific gravity of formulation (1) and thermosetting urethane resin, which are the worn parts.

(Operation and Effect) The sole having a protrusion on the ground surface obtained by this invention has a polymeric material forming the protrusion itself having a two-layer structure with different hardness, and the base of the protrusion in contact with the base sole is made to approximate the base sole. In addition to being made of a low-hardness material, the hardness of the grounding part of the protrusion is made of a material with a higher hardness than the base and bottom of the base. ■ Spike function and impact when worn! A sole with a cushioning function has been created, making it possible to demonstrate excellent durability against intense exercise with repeated rapid dashes and turns, such as those found in race car shoes.

(2) It has become possible to improve wear resistance by making the protrusion itself a polymeric material with two layers of different hardness, and by arranging a high hardness material in the ground contact part and a low hardness material in the root part.

By configuring the polymer material used for the base of the protrusion to have a hardness similar to that of the polymer material used for the bottom of the base, it is possible to prevent stress from concentrating on the bonding interface between the two.
As is clear from the results of Example 2, the joint durability between the base of the protrusion and the bottom of the base against high-speed frictional sliding under load is at a level that does not cause fading compared to a single material. Ta.

■Constructed from three types of polymer materials: the bottom of the base, the protrusions on the ground side, and the protrusions on the bottom of the base, and the protrusions are pre-molded and joined, so the base bottom and protrusions can be colored differently. You can create an extremely colorful design by making any combination of colors possible, such as molding part of the protrusion in a different color, or changing the color of the side surface of the protrusion and the bottom side of the base. It is also possible to obtain soles of

[Brief explanation of drawings]

Figure 1 is a bottom view of the sole of the present invention, Figure 2 is the X in Figure 1.
-X sectional view, FIG. 3 is a sectional view of a conventional shoe sole made of a single material, and FIG. 4 is a side view of a sandpaper set abrasion tester used in the present invention. ■ = Base bottom 2: Base bottom projection 3: Ground side projection 4: Single material projection 5: Same material as the projection Base bottom 6: Load 7: Load platform 8: Pulley 9: Sandpaper 10: Shoe sole

Claims (1)

[Claims] (1) In a shoe sole with a large number of protrusions formed on the contact surface, the protrusions themselves have a laminated structure of two types of polymer materials with different hardness, and the hardness of the polymer material on the side that contacts the base sole is equal to the hardness of the base sole. 1. A shoe sole having protrusions on a tread surface, characterized in that the protrusions on the tread surface side are integrally joined with a polymeric material having a higher hardness than these.