JPH06113901A - Mold for mainly forming grounding sole - Google Patents

Abstract

PURPOSE:To improve the efficiency of producing a grounding sole and the durability thereof by softening unvulcanized rubber by the pressure of an upper mold and heating and letting the same flow in projection-like recesses through communication holes of the microdiameter in an intermediate mold to be closely connected to the main body on a lower mold. CONSTITUTION:The main body 8 of a grounding sole formed by cutting a nonwoven fabric or the like in a grounding sole shape and applying an adhesive to the outer surface thereof is placed on the top surface 6 of a lower mold (c). Subsequently, the lower surface of an intermediate mold (b) is superposed on the lower mold (c) to clamp the main body 8. Unvulcanized rubber 10 is stored in a recess 2 of the intermediate mold (b), and an upper mold (a) is superposed thereon to cover the rubber, so that the unvulcanized rubber 10 is heated and pressed to be softened by the projecting part 1 of the upper mold. Whereupon, most of the rubber is pushed out into the respective projection-like recesses 4 through the respective small recesses 3 and the respective communicating holes 5 to closely adhere onto the main body 8 of the grounding sole so that the unvulcanized rubber in the projection-like recesses 4 and the adhesive are vulcanized and hardened together to be united in a body. When the upper mold (a) and subsequently the intermediate mold (b) are removed, surplus amount of vulcanized rubber connected in the recess 2 of the intermediate mold (b) and the small recesses 3 and the communicating holes 5 is simply separated from the projection 5 of the grounding sole at the edge of the communicating hole 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a mold for molding a grounding bottom of a sole of an athletic shoe, especially an athletic shoe for racing.

[0002]

2. Description of the Related Art Conventionally, as a method of manufacturing a sole in which projections of polyurethane elastomer are integrally bonded to a non-woven sheet in order to manufacture a sole of athletic shoes mainly for racing,
For example, Japanese Patent Application No. 63-14072 relating to the applicant's patent application
There is an invention related to No. 9. According to such a manufacturing method, a liquid polyurethane composition is poured and filled into a lower mold which is a mold for manufacturing shoes, and then a nonwoven fabric sheet having a polyurethane coating layer is placed and sandwiched by a lid mold and heated. The desired sole is obtained by applying pressure. However, according to this manufacturing method, when the protrusions of polyurethane were bonded to the nonwoven sheet, it was necessary to apply a coating layer of polyurethane to the nonwoven sheet in advance in order to strengthen the bonding force. The coating work is extremely complicated, and variations occur depending on the skill level of the work, and partially incompletely bonded portions may occur, resulting in a defect that the quality is not constant. Further, since the nonwoven fabric sheet may be hardened and brittle by heating, there is also a step of aging the shoe sole once taken out from the mold for a certain period of time at a proper temperature, as a method of gently promoting crosslinking. However, according to this manufacturing method, there is a defect that the aging takes a considerably long time, the productivity is remarkably deteriorated, and the mass production is difficult.

[0003]

DISCLOSURE OF THE INVENTION The present invention overcomes the deficiencies of the conventional mold for forming the sole of the shoe sole and the method for manufacturing the sole using the same, and has high production efficiency and durability. An object of the present invention is to provide a ground contact bottom which has a protrusion formed on the surface of the ground contact bottom clearly and firmly, and has excellent anti-slip action, durability and wear resistance.

[0004]

A molding die A of the present invention for solving the above-mentioned problems is an upper die a having a convex portion 1 on the lower surface side.
And a recess 2 for fitting the convex portion 1 of the upper mold a on the upper surface side
And a large number of upward small dents 3 and 3 at predetermined portions in the dent 2.
Are formed on the lower surface side, and the downward projection-shaped recesses 4, 4 are formed at the portions corresponding to the respective upward recesses 3 on the lower surface side.
.. and each of these small recesses 3 and each of these projection-shaped recesses 4
.. for communicating with each other, and a lower side c having a wide upper surface 6 corresponding to the lower surface side of the middle mold b on the upper surface side. The main body 8 of the grounded bottom B is placed on the upper surface 6 of the side c, the middle die b is superposed on the lower die C on which the main body 8 is placed, and the main body 8 is sandwiched. A predetermined amount of unvulcanized rubber 10 is accommodated in the recess 2 of the hollow mold, and the upper mold a is superposed on the middle mold b containing the unvulcanized rubber 10.
The unvulcanized rubber 10 softened by pressure vulcanizing 10 at a known vulcanizing temperature and pressure for 4 to 5 minutes forms the protrusions with the small recesses 3 of the recesses 2 and the communication holes 5 of the middle mold b. The fact that it is tightly connected to the inside of the recess 4, that is, to the main body 8 is a novel constituent means.

[0005]

The molding die A according to the present invention has a predetermined amount of unvulcanized rubber 10 by the pressure and heating by the convex portion 1 of the upper die a.
Is softened to flow into each projection-shaped recess 5 from each upward recess 3 of the middle mold b through each communicating hole 5 of fine diameter, and tightly bond to the main body 8 on the upper surface 6 of the lower mold c. It Also, in each of the five sides of the communication hole of the fine diameter of the middle die b, between each of the five sides of the communication hole and each of the upward small depressions 3 and the depressions 2 of the inner bottom b and the convex portion 1 of the upper die a. It is possible to easily cut and separate the excess amount of rubber formed in the. Furthermore, like the groove or ridge 11 formed in a predetermined portion of the convex portion of the upper mold a, the ridge or groove 12 formed in a portion facing the groove or ridge 11 on the bottom surface of the recess 2 of the middle die b. A plurality of different types or different colors of unvulcanized rubbers 101 and 102 can be partitioned by the fitting and coupling of the above. Further, a table portion or a shallow recess 61 is formed on the upper surface 6 of the lower mold c to mount or fit the main body 8 thereon.

[0006]

EXAMPLE A typical example of a molding die A according to the present invention will be described with reference to the drawings. The molding die A is composed of an upper die a, a middle die b and a lower die c as shown in FIG. The upper mold a has the middle mold b on the lower surface side.
A convex portion 1 for pressing a predetermined amount of unvulcanized rubber 10 accommodated in the recess 2 is formed so as to project downward. Next, the middle die b is opened upward on the upper surface side thereof, and the upper die a
Is formed with recesses 2 into which the required amount of the unvulcanized rubber 10 is accommodated and which is also mounted on the lower surface side of the plurality of projections 7, 7 ... The projection-shaped recesses 4, 4, ... Are formed at corresponding portions, and the small recesses 3, 3, ... Are similarly formed at portions of the recess 2 that correspond to the respective projection-shaped depressions 4, 3. Further, communication holes 5, 5, ... Having a small diameter are formed to connect the small recesses 3 and the protrusion-shaped recesses 4 with each other. Each communication hole 5
Here, in order to easily remove the excess amount of vulcanized rubber, it is desirable to use a small diameter, but if it is too small, unvulcanized rubber 10 flows from each small recess 3 into each projection-shaped recess 4. If it is too large, it is difficult to cut and remove it here,
Then, as a result of the experiment, it was confirmed that the diameter is preferably 1.0 to 1.5 mm and the length is 1 mm or less. Further, the lower mold c forms an upper surface 6 on which the main body of the grounding bottom on the upper surface side is to be placed. In addition, the upper surface 6 has a grounded bottom-shaped expansion including the protrusion-shaped depressions 4 of the middle die b.

Next, a method for forming a desired ground contact bottom B using the mold A will be described below. That is, as shown in FIG. 2, the grounding bottom A according to the present invention is formed by first cutting a non-woven fabric or artificial leather material into a grounding bottom shape on the upper surface 6 of the lower mold c of the molding die A. On the outer surface, the main body 8 of the grounded bottom B, which is coated or impregnated with a desired adhesive such as a chloroprene adhesive, is placed. Next, the lower surface side of the middle mold b is superposed on the lower mold c on which the main body 8 of the ground bottom B is placed on the upper surface 6, and the main body 8 of the ground bottom B is sandwiched by the middle mold b and the lower mold c. .

Next, the unvulcanized rubber 10 is placed in the recess 2 of the middle mold b.
Pay in. The unvulcanized rubber 10 is a mixture of natural rubber or synthetic rubber suitable as a well-known shoe sole material or anti-slip protrusion material with an appropriate compounding agent, or a mixture of these natural rubber and synthetic rubber. It is prepared by mixing an appropriate compounding agent. Further, the upper mold a is overlaid and covered on the middle mold b containing the unvulcanized rubber 10, and the convex part 1 of the upper mold b presses the unvulcanized rubber 10 in the middle mold b. At this time, a conventional vulcanization method, that is, pressurization at a predetermined temperature for a predetermined time, for example, a temperature of 150 to 160 ° C., about 150
The unvulcanized rubber 10 is vulcanized and cured by applying heat and pressure at a pressure of kg / cm ² for about 4 to 5 minutes. At this time, the unvulcanized rubber 10 is in a state of being softened by pressure and easily flowable, and due to the pressure of the convex portion 1 of the upper mold a, most of the inside of the recess 2 of the middle mold b is each small recess 3 and The unvulcanized rubber 10 and the adhesive in each projection-shaped recess 4 are added together by being extruded into each projection-shaped recess 4 with a diameter through each communication hole 5 and closely contacting with the main body 8 of the grounding bottom B. Sulfur cure integrated. After the vulcanization and curing, the upper mold a is first removed, and then the middle mold b is removed.
As shown in, the excess amount of vulcanized rubber that was continuous in the recess 2 of the medium size b, each small recess 3 and each communication hole 5 is easily separated and cut at each communication hole 5 side of the finest diameter. , The vulcanized rubber in each protrusion-shaped recess 4 of the middle mold b, that is, each protrusion 7 of the grounded bottom B is separated. Therefore, on the upper surface 6 of the lower mold c, as shown in FIGS.
It will be placed with the grounded bottom B with ... formed. The small dents 3 and the protrusion-shaped dents 4 of the medium size b may be collectively referred to as injection holes.

[0009]

[Other Embodiments] A molding die A according to the present invention is shown in FIGS.
In addition to the one shown in FIG. 4, as shown in FIGS. 4 and 5 and FIGS. 6 and 7, the upper die a of the molding die A is one or more in a predetermined portion of the convex portion 1. A groove that opens downward or a protrusion 11 that protrudes downward, and the middle die b is also formed in each groove or protrusion 11 of the upper die a in a portion of the depression 2 except the portion where each small depression 3 is formed. Upwardly projecting ridges or upwardly open grooves 22 are formed that face each other and are mated or fitted together. Therefore, as in the case of the above-described basic embodiment, the main body 8 is sandwiched by the middle mold b of the lower mold c, and the ridges or grooves 12 formed in the middle mold b except for the locations where the small recesses 3 are formed. Since the recess 2 of the middle mold b is partitioned by the middle mold b, a plurality of different or different color unvulcanized rubbers 101 and 102 are respectively housed in different sections, and then the middle mold b is covered with the upper mold a by the middle mold. When b is pressed and overlapped, and the unvulcanized rubbers 101 and 102 are vulcanized and cured by heating and pressurizing for a predetermined time as desired, the main body 8 as shown in FIG. Different or different colored rubber protrusions 7, 7 ・ on the ground side
It is possible to form and provide the ground contact surface B provided with.
In this case, the convex portion 1 of the upper die a of the molding die A has a groove 12 formed therein, and the protrusion 22 is formed in the corresponding depression 2 of the middle die b. Vulcanized rubber 101 and
102 partitions can be made smoother and more reliably.

Further, in addition to the molding die A according to each of the above-mentioned embodiments, as shown in FIGS. 6 and 7, the molding die A is used.
The lower mold C has a shallow recess or base 61 on the upper surface 6 thereof, into which the main body 8 including all the projection-shaped recesses 4, 4, ... Therefore, since the main body 8 is accurately clamped at a predetermined position, each protrusion 7 can be tightly connected to a proper position.

In this case, it is preferable to provide the main surface 8 of the lower mold C with the main shallow recess 61 of the grounding surface B so that the movement of the main body 8 can be suppressed more and the protrusions 7 can be properly formed. be able to.

[0012]

EFFECTS OF THE INVENTION The grounding bottom B molded by the molding die A according to the present invention has a plurality of projections 7, 7 ... Having excellent wear resistance, which are non-slip on the main body 8 thereof, and can be clearly and accurately formed. Since it is closely attached to, it can be offered for racing and with high commercial value. In addition, each of the communication holes 5 with a small diameter of the medium die b
Accordingly, each protrusion 5 on the grounding surface A side, each small recess 3 that becomes an extra amount, and the convex portion 1 of the upper mold a continuous with this and the above-mentioned middle mold b
Since the rubber formed between the recesses 2 can be easily cut and removed, the production efficiency can be extremely increased and the production cost can be reduced. Further, the protrusions or grooves 22 formed in the recess 2 of the middle die b and the grooves or protrusions 11 formed in the convex portion 1 of the upper die c facing the protrusions or grooves 22 are fitted and coupled to each other to form a plurality of different or different colors. Since the vulcanized rubbers 101 and 102 can be partitioned, a plurality of different or different-colored vulcanized rubber projections 7, 7, ... Can be formed at a predetermined portion on the main body 8. Therefore, it is possible to contribute to the provision of the ground contact bottom B having a good appearance, and further,
Since the main body 8 of the grounding bottom B can be placed on the base 61 of the upper surface 6 of the lower mold C by sandwiching it or the main body 8 of the grounding bottom B can be fitted and supported in the shallow recess 62, the main body 8 can be supported. It could be reliably supported and contributed to the provision of the desired ground contact bottom B.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of a molding die according to a basic embodiment.

2 is a schematic vertical cross-sectional view showing a state where a grounding bottom is molded using the molding die according to the embodiment of FIG. 1. FIG.

FIG. 3 is a partially enlarged cross-sectional schematic view showing a solid state of unvulcanized rubber when forming the ground contact bottom of FIG.

FIG. 4 is a schematic vertical sectional view of a molding die according to another embodiment.

5 is a schematic vertical cross-sectional view showing a state in which a grounding bottom is molded using the molding die according to the embodiment of FIG.

FIG. 6 is a schematic vertical sectional view of a molding die according to still another embodiment.

FIG. 7 is a schematic vertical cross-sectional view showing a state in which a grounding bottom is molded using the molding die according to the embodiment of FIG.

FIG. 8 is a schematic plan view showing a ground surface side of a ground bottom molded by using a molding die according to a basic embodiment of the present invention.

9 is a schematic vertical cross-sectional view taken along the line XX of FIG.

FIG. 10 is a schematic vertical cross-sectional view of a grounding bottom formed by using a forming die according to another embodiment.

[Explanation of symbols]

 A Molding die B Grounding bottom a Upper die b Medium die c Lower die 1 Convex part 2 Recess 3 Small recess 4 Protruding recess 5 Communication hole 6 Top surface 7 Protrusion 8 Main body 10 Unvulcanized rubber

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B29K 105: 24 B29L 31:50 4F

Claims (3)

[Claims] 1. An upper mold a having a convex portion 1 on a lower surface side, a recess 2 on the upper surface side for fitting the convex portion 1 of the upper mold a, and a large number of upward small recesses at predetermined portions in the concave portion 2. 3, 3 ... Forming downward projection-shaped recesses 4, 4 ... In the same area on the lower surface side as the above-mentioned small recesses 3 and each of these small recesses 3 and each projection shape. .. and a lower mold c having a wide upper surface 6 corresponding to the lower surface side of the middle mold b on the upper surface side. The main body 8 of the grounded bottom B is placed on the upper surface 6 of the lower mold b, the middle mold b is superposed on the lower mold c on which the main body 8 is mounted, and the main body 8 is sandwiched between the middle mold b and the lower mold c. A predetermined amount of unvulcanized rubber 10 is placed in the recess 2 on the upper surface side, and the upper die a is stacked on the middle die b in which the unvulcanized rubber 10 is placed. In addition, the unvulcanized rubber 10 is pressure-vulcanized at a known vulcanization temperature and pressure for 4 to 5 minutes, and the softened unvulcanized rubber 10 communicates with each small recess 3 of the recess 2 of the middle mold b. A molding die A mainly for molding a grounding bottom, characterized in that a hole 5 is formed so as to be closely bonded to the inside of each projection-shaped recess 4, that is, the main body 8. 2. The upper die a of the molding die A has one or a plurality of grooves or ridges 11 formed at a predetermined portion of the convex portion 1, and the middle die b has the upper die a in the recess 2. 2. A molding die A mainly for molding a grounding bottom according to claim 1, characterized in that each ridge or each groove 22 fitted or fitted to each groove or each ridge 11 is formed. . 3. The molding die A is characterized in that a table for mounting the main body 8 or a shallow recess 61 for fitting is formed on an upper surface 6 of a lower die c thereof. 1. A molding die A mainly for molding a grounded bottom as described in 1 above.