JPH01171502A - Manufacture of double sole - Google Patents

Abstract

PURPOSE:To intensely connect a resin material for an upper sole with the lower sole of vulcanized rubber, etc., by providing a resing burr hole so as to connect a sole molding external part, a sole molding space in the mold and near the throughout port of a rubber burr cavity. CONSTITUTION:A lower sole 9 is prepared in which a burr 7 projects from an external peripheral part. Further, a sole molding cavity 6 is constituted in a mold 1, and a rubber burr cavity 8 is provided in a concave way so that the burr 7 may be housed in the internal peripheral surface of the mold. Further, a sole forming mold 1 is used so that a resin burr hole 11 may gradually be tapered from the lower mold or the tops of side molds 3a and 3b through the internal part of the mold to the part facing near a communication port 12 between the rubber burr cavity 8 and the sole molding cavity 6. A rubber lower sole 9 is inserted into the mold 1, next, the resin material for an upper sole 10 consisting of polyurethane foam, etc., is injected to the sole molding cavity 6, and after removing the mold, the rubber burr 7 of the lower sole 9 is cut off.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method for manufacturing a two-layer shoe sole, and more specifically, the present invention relates to a method for manufacturing a two-layer shoe sole. The present invention relates to a method for producing unit soles constructed in layers or soles for injection molded shoes.

The method of the present invention uses PvClTR, P as the material for the sole of the shoe.
This also includes cases where U etc. are used.

(Conventional technology) Polyurethane foam is lightweight and has high cushioning properties, and vulcanized rubber has excellent anti-slip and abrasion resistance, so in recent years, polyurethane foam has been developed to take advantage of the properties of both materials. Shoes (mainly injection-molded shoes) with a two-layer sole (composite sole), which combines an upper sole made of vulcanized rubber and an upper sole made of vulcanized rubber, have been developed and are widely used in athletic shoes, etc. .

However, this kind of double-layer soles have been conventionally used because polyurethane foam and vulcanized rubber are a combination of relatively poor adhesive properties during wear, especially when used for intense interlocking. , the joint between the upper and lower soles is peeled off,
There was a problem that the function as a shoe sole could deteriorate. Particularly, in injection-molded shoes, etc., if a cracking defect caused by air pockets is formed near the joint of the outer circumferential surface of the sole, peeling between the upper sole and the upper sole tends to be further accelerated.

As a countermeasure against this problem, a method has been proposed in which burrs are formed on the upper and lower soles in advance at the joints during sole molding, and the burrs are removed in the subsequent process (Japanese Patent Publication No. 61-28327
(Refer to the publication number, etc.)

Injection molded shoes made by this method are shown in FIGS. 8 and 9, for example.
As shown in the figure, a rubber burr 2 extends from the upper part of the outer periphery.
An upper shoe sole 9 made of vulcanized rubber is prepared, and 7 is formed around the entire circumference of the sole, and together with the burr forming chamber 22, side molds 23a and 23b are formed on the inner peripheral surface of the mold. In addition to the side molds 23a and 23b, a last mold 24 and a bottom mold 25 are set to form a sole molding gap 26, and at the same time, the upper sole 9 is inserted into the gap 26 with a rubber burr 2.
7 is placed in the forming chamber 22, and then polyurethane foam is injected into the sole molding cavity 26 to fill it to form the upper sole 10. At the same time, it is joined to the upper sole 9, and further formed. The chamber 22 is also filled with foam to form a resin burr 30, and after demolding, the rubber burr 2 and the resin burr are removed.
It is manufactured by cutting out the 3 () together.

(Problems to be Solved by the Invention) The above manufacturing method removes the periphery (burr) of the bonding surface between the upper and lower soles, which is prone to peeling, and also causes air pockets.
Even if the resin burr 9 is cured, it is usually formed at the inner part of the resin burr 30 (Fig. 9), so the bonding performance between the polyurethane foam L sole IO and the vulcanized rubber upper sole 9 is greatly improved. This is a very useful point.

However, it is generally not easy to remove the resin burrs made of cured polyurethane foam along with the rubber burrs by mechanical processing, and the above manufacturing method requires special equipment for this purpose. It is said that Moreover, it is extremely difficult to cut both of these burrs at accurate positions and to create a cut surface or a smooth surface.
Traces of burr cutting tend to remain on the outer circumferential surface of the sole, which poses a problem in terms of product appearance design.

The present invention has been made to further improve the above-mentioned conventional manufacturing method, and its purpose is to mold a shoe sole with significantly high bonding strength between a resin shoe sole and a rubber shoe sole, and to
To provide a method for manufacturing a two-layer shoe sole that facilitates the removal of pars and forms a smooth cut surface.

(Means for Solving the Problems) The method for manufacturing a two-layer shoe sole of the present invention is a unit sole composed of two layers: an upper sole made of vulcanized rubber, etc., and an upper sole made of polyurethane foam, etc. Alternatively, when manufacturing the soles of injection molded shoes, prepare an upper sole that extends from the outer peripheral edge of the burr, form a sole molding cavity in the mold, and place a rubber burr cavity on the inner peripheral surface of the mold. Further, a resin burr hole is formed from the upper surface of the lower mold or side mold through the inside of the mold so that it gradually tapers toward the area where the rubber burr gap communicates with the sole molding gap. The rubber sole is inserted into the sole mold, and then the resin material for the upper sole is injected or injected into the cavity in the sole mold to fill it. After that, the rubber pad of the sole of the lower shoe is removed after the mold is removed.

Further, the advantageous manufacturing method of the present invention includes a last mold, a bottom mold, and a pair of left and right side molds,
These molds are configured to form a sole molding cavity, and the side mold is provided with a rubber burr cavity on the inner peripheral surface of the side mold, and a resin burr hole formed from the upper surface of the side mold through the inside of the mold. A shoe sole forming mold that is formed to gradually taper toward the vicinity of the communication opening between the rubber burr gap and the sole molding gap, and further has an upper end located on the site molded surface at a position inside the opening of the resin burr hole. using.

Inserting the lower sole extending from the outer peripheral edge of the rubber pad into the sole molding cavity and suspending it into a flexible last mold, then filling the cavity by injecting a resin material for the upper sole, The present invention relates to a method for manufacturing a two-layer sole of an injection molded shoe by removing the rubber burr from the extruded sole after the mold is removed.

The upper sole is made of vulcanized rubber, TR, etc., and has a rubber burr several mm thick extending from its outer periphery.

Preferably, the pads are formed continuously or intermittently over the entire circumference of the sole.

] - The sole is made of a resin material such as polyurethane foam, and is filled by injecting or injection injection into the sole molding cavity of the sole molding mold described below after inserting the lower sole.

In addition to the internal sole molding cavity, the shoe sole forming mold has a rubber burr cavity corresponding to the shape and size of the rubber burr recessed in the inner peripheral surface of the mold. Furthermore, the mold is formed so that the upper surface of the mold, in which the resin burr hole is opened, passes through the inside of the mold and faces near the communication opening between the rubber burr gap and the sole molding gap.

The resin burr hole is tapered, for example, or formed in a plurality of steps so as to gradually become tapered.

Furthermore, a plurality of resin burr holes are preferably formed along the communication opening between the two voids all around the sole, and most preferably, a plurality of resin burr holes are formed on the upper surface of the mold through the opening of each resin burr hole or through the molding time burr hole. The resin burrs (polyurethane foam, etc.) overflowing onto the upper surface of the mold are formed so close to each other that they are connected in series.

Also, the larger the opening on the upper surface of the mold, the easier it is to remove burrs during demolding. ! There is a guess,
Further, the smaller the opening facing the vicinity of the communication port, the more difficult it is to leave traces of burr removal on the surface of the sole of the product, and it is more preferable. For example, a diameter of 0.4 to I1.8 nu++ is suitable. Further, it is preferable that the difference in size (diameter) between the openings on the two sides of the mold and the openings near the first communication hole be larger, since this makes it easier to remove burrs during demolding.

When the resin burr holes have the above dimensions, the interval between each burr hole is 5 to 15 mm, preferably 8 to I.
If it is [ ] mm, the resin burr on the upper surface of the mold will be connected to the chain, and it will be extremely easy to remove the burr, so such a size is very suitable.

Furthermore, the shape, size, location, number, etc. of the resin burr holes, etc., the type of resin material used for shoe soles, the ingredients and their proportions, mechanical properties, especially properties in the logical state, The conditions are set to be optimal, especially considering viscosity and the like.

In addition, when the shoe sole molding mold 1 is used for manufacturing injection molded shoes and is composed of a bottom mold and a pair of left and right side molds, a resin burr hole is formed on the upper side of the site molded surface. [Inward position from 1,
Preferably, if it is provided over the entire circumference of the side mold and the last molding, it is possible to prevent resin burrs overflowing onto the surface of the mold from adhering to the skin of the last mold. It is preferable to C1.

(Function) In the present invention, the resin burr hole is provided so as to communicate between the outside of the sole mold and the vicinity of the communication opening between the sole molding cavity and the rubber burr cavity in the same mold, and the resin burr hole is provided for injecting or injecting the upper sole material. Since the structure allows resin burrs to form freely when molding, the resin material for the sole of the shoe fills every nook and corner without being affected by the suppressing effect, and the resin material for the sole of the shoe fills every nook and corner, making it possible to Connects firmly to the bottom. In particular, since the resin burr hole communicates with the outside of the mold and has a structure that allows air to escape very easily, air pockets are almost never generated, and even if they do occur, they occur inside the resin burr hole. Therefore, so-called design defects (defects) do not occur at the joint between the sole and the upper sole, and this does not cause a decrease in the joint strength between the upper and lower soles.

In addition, in the present invention, since the resin burr hole is formed so as to be tapered gradually, it is possible to simultaneously remove the mold after injecting or injecting the resin material for the sole of the shoe, i.e., from the mold of the sole forming mold device. By the opening operation, the resin burr inside the resin burr hole can be torn off from the outer peripheral surface of the molded sole, and then the resin burr can be pulled out from the resin burr hole.

Therefore, resin burrs can be removed simply and easily without using any special equipment. Then, after demolding,
Only rubber burrs remain on the outer surface of the sole. This rubber burr is
Because it is soft, it can be easily excised using simple cutting equipment. The outer circumferential surface of the sole thus manufactured is very smooth, with no traces of burrs being noticeable at all.

(Examples) Hereinafter, the present invention will be explained in more detail by showing Examples, but the following Examples are not intended to limit the present invention in any way.

Example 1 This example relates to the use of a shoe sole mold for injection molded shoes.

As shown in FIG. 1, the shoe sole forming mold 1 has the same structure as the conventional one, and includes a pair of left and right side molds 3a, 3b, a last mold 4, and a bottom mold 5. configured to be formed.

As shown in FIG. 2, the left and right side molds 3a' and 3b have a rubber burr gap 8 in the inner circumferential surface of the mold that can accommodate the rubber burr 7 shown below, and a resin burr hole 11 in the mold. A plurality of holes are formed so as to gradually taper from the upper surface 15 through the inside of the mold toward the communication opening 12 between the sole molding gap 6 and the rubber burr gap 8, and over the entire inner peripheral surface of the mold.

Furthermore, as shown in FIG. 3, the left and right side molds 3a, 3b are arranged so that the bank 14 on the upper surface 15 of the mold is positioned inside the opening 13 of the resin burr hole 11, along the edge of contact with the last mold 4. It is arranged in a loop shape.

As shown in FIG. 4, the resin burr hole 11 indicated by L has a conical cross section, and the diameter A of the communication port 12 is approximately 0.4 to 1 to 0.
8 mm, L side frontage 13 diameter B or approx. L (without)
Shi: 1mm. The interval P between the burr holes 11 is about 8 to 10 mm, so that the resin burrs 17 overflowing onto the upper surface of the mold during molding can be connected in series. Instead of the resin burr hole 11, a resin burr hole 18 having a plurality of steps as shown in FIG. 5 may be formed in the side mold.

First, an upper shoe sole 9 made of vulcanized rubber with a rubber burr 7 extending from its outer periphery is prepared, and the upper shoe sole 9 is molded into the sole molding gap 6 of the mold 1 with a rubber burr 7f. Charge it so that it fits in the gap 8, and together with it
Hang 6 into last mold 4, then mold
3a, 3b, 4, and 5 are set according to a conventional method, and a resin material made of polyurethane foam is injected and filled into the sole molding gap 6 to form the upper sole 10 and at the same time join it to the upper sole 9. do. In this case, the resin material enters the resin burr hole 11, overflows onto the mold upper surface 15, and the overflowing resin burr 17 is connected in series as shown in FIG.

However, since there is a skill of 14, the resin burr is 17 or the skin is 1.
There was no adhesion to No. 6.

Thereafter, at the same time as demolding, the resin burr 17 in the paris hole 11 is cut off from the outer peripheral surface of the molded sole by the opening operation of the mold l.

Thereafter, the rubber burr 7 remaining on the outer circumferential surface of the sole is cut off using a conventional cutting device to produce an injection molded shoe with a two-layer sole.

Example 2 This example relates to the use of a sole forming mold for a unit sole.

As shown in FIG. 6, the sole forming mold 2 has the same structure as the conventional one, and includes an L side mold 19 and a lower side mold 20, and a sole forming cavity 6 is formed in the mold.

As shown in FIG. 7, the mold 2 is provided with a rubber burr gap 8 in which the rubber burr 7 can fit over the entire circumferential surface of the mold, and a resin burr hole 11 that extends from the top surface 21 of the mold on the mold side. A plurality of holes are formed over the entire inner circumferential surface of the mold so that they gradually become tapered as they pass through the mold and face the communication hole +2 between the sole molding gap 6 and the rubber burr gap 8. The shape, dimensions, mutual spacing, etc. of the resin burr holes 11 are the same as those of the first embodiment.

Then, a sole 9 made of vulcanized rubber and extending from the outer peripheral edge of the rubber burr 7 is inserted into the sole molding cavity 6 of the mold 2.
Then, the rubber burr 7 is inserted so as to fit into the gap 8, and then the resin material for the sole of the shoe is injected into the gap 6 and filled.
The upper sole IO is molded and joined to the upper sole 9 at the same time.

Then, after opening the mold, the molded sole is taken out. At this time, the resin burr in the burr hole 11 is cut off from the outer peripheral surface of the sole.

Thereafter, the rubber burr 7 existing on the outer circumferential surface of the molded sole is cut off using a conventional cutting device. On the other hand, the resin burr left in the burr hole ll of the mold 2 is pulled out and removed.

(Effects of the Invention) As explained above, the method for manufacturing a two-layer shoe sole of the present invention is as follows:
The two-layer sole, which consists of an upper sole and a lower sole made of different materials, has a high bonding strength and can be molded to avoid the occurrence of hem cracks (extraction is a defect). Sole material (
It is possible to remove burrs from resin without using any special equipment.
Resin burrs and rubber burrs can be removed simply and easily, and a smooth burr removal surface can be formed, resulting in a two-layer sole with a good external appearance. moreover,
- There is no need to form the burr on the sole of the shoe over the entire circumferential surface of the sole, so it is possible to design the inner circumferential surface of the burr as well.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the inside of the sole mold when the sole of an injection-molded shoe is manufactured according to the method of Example 1 of the present invention, and FIG. 2 is a main part of the sole mold shown in FIG. 1. Cross section I showing
J, 31'A is a view of the sole mold of Figure 1 seen from 1-, and Figure 4 schematically shows a large number of resin burr holes formed in the sole mold of 1 p:<. 51A is a diagram showing a resin burr hole in a modified example, FIG. 6 is a sectional view showing the inside of a shoe sole forming mold when a unit sole is manufactured according to the method of Example 2, and FIG. 8 is a sectional view showing the inside of the sole mold when the sole of an injection molded shoe is manufactured according to the conventional method (-); FIG. FIG. 9 is a sectional view showing essential parts of the shoe sole forming mold shown in FIG. 8; In the figure, ■, 2...Sole forming molds 3a, 3b...Side mold 4...Last mold 5...Hottom mold 6...Sole molding gap 7...Rubber burr 8...Rubber burr Gap 9...Sole lO...Upper sole 11.18...Resin burr hole 12...Four openings 13...Opening L1 l4...Soil 15...Top surface of side mold 16...Top skin 19...Upper mold 20...Do side mold 21...Lower mold upper surface 29... Air reservoir Patent applicant Achilles Co., Ltd. Fang 1 Figure 3 Figure 1.2. Vine Ox 3 mold 12・'I
LA03a, 3b...
13 Ran 04, Last Mold'
14., ±45...Hot mold
15. 庺IF7-ILDO1 [Yes] 6. Shape void layer to shoe Δ, 16 Kaitai 7 Ko'mbari
19- Upper tank no mode 8 11゛suT
Chen 20 lower surplus t-rudo 9-tk bottom
21-T side mold top surface 1o Upper shoe sole 29・-Completed; Desired 11.18
・1 inch Ab + ＼゛su）LA Kuragokou no Kai B
tIP of top opening + t11,000 yen 5
C6 Fig. 4 E-5 Fig. 16 F'AP8 Fig. O-9 Fig.

Claims (1)

[Claims] (1) When manufacturing unit soles or injection molded shoe soles, which are composed of two layers: a lower sole made of vulcanized rubber, etc. and an upper sole made of polyurethane foam, etc., burrs extend from the outer periphery. A sole molding cavity is formed in the mold, a rubber burr cavity is recessed in the inner peripheral surface of the mold to accommodate the burr, and a resin burr hole is formed in the lower mold or side mold. Using a shoe sole forming mold, which is formed from the upper surface of the mold so that it gradually tapers toward the vicinity of the communication opening between the rubber burr gap and the sole forming gap, passes through the inside of the mold to form the rubber sole. The method is characterized by charging the inside of the mold, then injecting or injecting a resin material for the sole into the molding cavity to fill it, and then removing the rubber burr on the sole after demolding. Method for manufacturing double layer soles. (2) It is configured to include a last mold, a bottom mold, and a pair of left and right side molds, and to form a sole molding cavity from these molds, and the side mold is provided with a rubber burr cavity on the inner peripheral surface of the side mold. In addition, a resin burr hole is formed from the upper surface of the side mold so that it passes through the inside of the mold and becomes gradually tapered toward the vicinity of the communication opening between the rubber burr cavity and the sole molding cavity, and a bank is further formed on the upper surface of the side mold through the resin burr hole. Using a shoe sole forming mold placed inside the opening of the burr hole, insert the lower shoe sole with the rubber burr extending from the outer periphery into the sole forming gap, and suspend the shoe sole into the last mold. 2. The manufacturing method according to claim 1, wherein the resin material for the sole of the shoe is then injected and filled into the gap, and after the mold is removed, the rubber burr on the sole of the shoe is removed.