JPH01171503A - Manufacture of uneven design operated sole - Google Patents

Abstract

PURPOSE:To surely manufacture a sole having acute-angled uneven design at an external peripheral surface without generating the omission of the uneven design by providing a burr hole to connect the uneven part of a mold internal peripheral surface corresponding to the uneven design to a mold external part. CONSTITUTION:A sole forming mold 1 is used which is formed so as to be tapered from a lower mold or tops 10 of side molds 3a and 3b through a mold internal part to a part facing to a concave and/or concave surface 8 corresponding to the design at the mold internal peripheral surface. A material for the sole is injected with or without pressure into the internal part of the sole forming mold 1 to fill it. At this result, air stagnation is not completely generated near the uneven part, and consequently, the sole having not only the round design but also the acute-angled uneven design, which has been conventionally difficult to manufacture, at the external peripheral surface can be surely manufactured without generating the omission of the uneven design at all.

Description

Detailed Description of the Invention (Industrial Application 5f) The present invention relates to a method for manufacturing a unit shoe sole or an injection molded shoe sole having a concave design or a convex design on the outer peripheral surface. This invention relates to a method of manufacturing a shoe sole devised to form an uneven design with acute corners.

(Prior Art) Conventionally, in order to increase the commercial value of shoes, a method has been used in which a concave or convex design, preferably a novel design, is applied to the outer peripheral surface of the sole.

A shoe sole equipped with such a concave-convex design has a concave surface on the inner circumferential surface 7, in addition to a last mold and a bottom mold 5 having a normal configuration, as shown in FIGS. 9 and 10, for example. 8 and/or the convex surface 17 are prepared, and after suspending the upper 13, these molds are set, and then the sole resin material is poured into the sole molding cavity. It is manufactured by injection molding step 6 to make injection molded shoes.

(Problem to be Solved by the Invention) However, depending on the type of shoe sole resin material, especially in the case of soles made of polyurethane, etc., the fluidity of the material during injection or injection into the mold may be affected. Due to the poor quality, air rings tend to form inside the mold, and as a result, there is a problem in that design defects (defects) often occur on the outer peripheral surface of the molded sole. In particular, when a convex design is formed on the outer circumferential surface of the sole, as shown in No. 9 [2i1], the air ring 23 or the upper corner of the concave surface 8 tends to be formed, and as a result, the upper edge of the convex design When chipping occurs frequently, and when a concave design is formed on the outer circumferential surface of the shoe sole, as shown in FIG. Chips often occurred at the lower edge of the design, which was a major cause of decreased product value.

For this reason, conventional methods have generally been used to reduce the occurrence of air rings by rounding the uneven portions of the inner circumferential surface of the mold corresponding to the uneven design, especially at the corners. Therefore, the uneven design on the outer surface of the sole must be rounded or rounded.
This was a major constraint in terms of the design of the sole.

Therefore, depending on the conventional manufacturing method, it has been almost impossible to apply a concave-convex design with acute corners to the outer circumferential surface of a shoe sole without causing problems in practical use.

In order to prevent the occurrence of such an air ring and to make it possible to create an acute-angled design on the outer peripheral surface (sight line) of the sole, it may be possible to change or improve the sole material itself. for example,(
A method to lower the viscosity of the raw material composition of polyurethane foam, which is often used as a shoe sole material, and a method to slow down the foaming reaction of the polyurethane foam and make air release smooth and quick through gentle foaming. There are ways to do this.

However, method (2) lowers the physical properties of the polyurethane foam itself, making it unsatisfactory as a shoe sole material, and method (2) requires a long time for foaming, which reduces shoe productivity. Therefore, C1
Either method is not suitable for practical use.

The present invention has been made in consideration of the above circumstances, and its purpose is to satisfy the conditions for the sole of shoes, and also to provide an air ring.
To provide a method for manufacturing a shoe sole that can satisfactorily apply an uneven design with sharp corners to the outer peripheral surface of the shoe sole without causing design defects.

(Means for Solving the Problems) The method for manufacturing a shoe sole of the present invention has a concave design and/or a six-point design.
When manufacturing unit soles or soles of injection-molded shoes, the burr holes are passed through the inside of the mold from the L surface of the lower mold or side mold to correspond to the design on the inner peripheral surface of the mold. A shoe sole forming mold is used, which is formed so that it gradually tapers toward the surface of the convex portion and/or the concave portion, and the material for the sole is injected or injected into the inside of the shoe sole forming mold to fill it. That is.

In the case of injection molded shoes, preferably last mold,
It includes a bottom mold and a pair of left and right side molds, and is configured to form a sole molding cavity through these molds, and the side mold has a burr hole formed from one surface of the side mold through the inside of the mold to form an uneven design. The sole is formed so that it gradually tapers toward the convex and/or concave surface of the inner peripheral surface of the mold, and a bank is provided on the upper surface of the side mold at a position inside the opening of the burr hole. using a mold.

Injection molded shoes may be manufactured by suspending the shoelace into a last mold, and then injecting and filling the sole resin material into the sole molding gap.

The shoe sole mold has no burr holes and bank configurations.
It may have a structure similar to the mold for unit soles or injection molded shoes that have been used in the past.

The mold has a convex and/or concave surface corresponding to a concave design and/or a convex design formed on its inner peripheral surface. The present invention can effectively apply the concave portions and convex portions on the inner circumferential surface of the mold to those having rounded corners as well as those having acute corners. Further, it is preferable that the uneven design on the outer circumferential surface of the sole be novel and provide novelty and comfort to the viewer. For example, a concavo-convex design that is elongated over the entire outer periphery of the sole may be mentioned.

The burr hole is preferably formed to extend substantially perpendicularly from the open upper surface of the mold through the inside of the mold so as to face the convex surface and the concave surface of the inner circumferential surface of the mold, especially the open portion. Further, the burr hole is provided so as to become gradually tapered, for example, by forming a tapered shape or a plurality of steps.

A plurality of burr holes are preferably formed over the entire outer periphery of the shoe ri while corresponding to areas of the uneven design, and most preferably, the burr holes are opened in the upper surface of the mold, or the sole of the shoe overflows to the north surface of the mold through the curvature. The burrs of the resin material are formed so close to each other that they can be connected in series.

In addition, the larger the opening on the upper surface of the mold, the easier it is to remove the burr during demolding, so it is more preferable. The smaller the opening facing near the bottom of the rim, the smaller the burr removal marks on the sole surface of the product, which is more preferable. Further, the larger the difference in size (diameter) between the two openings is, the easier it is to remove burrs during demolding.

And if there is a burr hole or dimensions like L.

The spacing between the burr holes is 5-15II11, preferably 8-11
If it is 10 m+e, the burrs of the sole material overflowing on the L side of one mold will be connected in a series, and it will be extremely easy to remove the burrs, so such a dimension is very convenient.

Furthermore, the shape, position, number, etc. of the burr holes are determined to be the optimal conditions by taking into account the type of shoe sole material used, the ingredients and their proportions, viscosity, flow state characteristics, etc. Set.

Further, when the shoe sole forming mold of the present invention is used for injection molding, it is preferable to provide the following arrangement. The upper part is located inside the opening of the burr hole on the north side of the side mold.
Preferably, it is provided in a loop shape along the entire outer periphery of the sole along the abutting edge with the last mold. By doing this, it is possible to prevent 1) burrs of the sole material overflowing onto the upper surface of the side mold from adhering to the fins of the last mold L.

(Function) In the present invention, since the burr hole is formed to communicate with the inside of the mold and the uneven part corresponding to the uneven design on the inner periphery of the mold, the molded surface sole material enters the burr hole from the uneven part. Then, as the air flows out to the surface of the mold 1-4, the air inside the mold is smoothly discharged to the outside air, so that no air gate is formed in the uneven portion. As a result, no chipping (cutting is a defect) occurs in the uneven design on the outer peripheral surface of the molded shoe sole, regardless of whether it is an acute-angled design or not.

(Examples) Hereinafter, the present invention will be explained in further detail by showing Examples, but the Examples described herein are not intended to limit the present invention to the same extent.

Example 1 This example relates to the use of an injection mold for shoes.

As shown in Fig. 1, the sole forming mold l is
It comprises a pair of side molds 3a, 3b, a last mold 4, and a photomold 5, and is configured so that a sole molding cavity 6 is formed by these molds.

As shown in detail in FIG. 2, the left and right side molds 3a and 3b are designed to form an acute-angled convex design on the outer circumferential surface of the sole.
A corresponding concave surface 8 is provided on the mold inner circumferential surface 7 over the entire circumferential surface, and a burr hole 9 is provided at the L side corner (acute angle As shown in FIG. 3, a plurality of the holes are formed over the entire inner circumferential surface of the mold so that they gradually become tapered toward the eggplant (2).

As shown in FIG. 4, this burr hole 9 has a conical cross section.
The diameter A of the curve on the concave surface 8 side is approximately 0.4 to 0.8 is
The diameter B of the upper surface opening 1'l is approximately 1 to 3 m.

The distance P between the burr holes 9 is approximately 8 to 10 mm.

Note that instead of the burr hole 9, a burr hole 15 having a plurality of steps as shown in FIG. 5 may be formed in the side mold.

Furthermore, as shown in FIGS. 2 and 3, the left and right side molds 3a, 3b' have the bank 12 on the upper surface 10 of the mold at a position inside the opening 11 of the burr hole 9, and extend over the entire circumferential surface of the sole. It will be set up.

Then, the shoe 13 is suspended in the last mold 4, the last mold 4, the bottom mold 5, and the left and right side molds 3a, 3b are set in accordance with the conventional method, and the sole material □ made of polyurethane or the like is applied to the shoe. Bottom molding gap 6
Injection molded shoes were manufactured by injection injection and filling.

In this case, in one embodiment, the sole material is the concave surface 8.
The burr penetrated into the burr hole 9, overflowed onto the upper surface of the mold, and the overflowing burr 14 led to -i as shown in FIG. However, since the handle 12 was provided, the burr 14 on the upper surface of the mold did not come into direct contact with the wrapper skin 13.

Thereafter, at the same time as demolding, ie, by the opening operation of the mold 1, the burr in the burr hole 9 is cut off from the outer periphery convex design of the molded sole. Thereafter, the burr in the burr hole 9 was pulled out and removed. Since the burrs 14 are connected in series, the burrs can be removed extremely quickly.

The injection-molded shoes manufactured in this manner have an acute-angled convex design that was not previously available on the entire outer circumferential surface of the sole, and there is no design chipping (defects) in the acute-angled convex design, especially at the upper edge. Not observed at all.

Example 2 The shoe sole mold used in this example is for injection molded shoes, and as shown in FIG. 17 is provided on the inner peripheral surface 7 of the side mold 3b (3a is not shown),
Further, the burr hole 16 is formed so as to gradually taper from the upper surface 10 of the mold, passing through the interior and facing the lower corner of the convex surface 17. The other configurations are the same as the mold of Example 1.

Even when injection molding is performed using this shoe sole mold, injection molded shoes with an unprecedented acute-angled concave design or the entire outer circumferential surface of the sole can be manufactured without chipping of the concave or heel design. It's here.

Example 3 This example relates to the case of using a sole forming mold for a uniform shoe sole.

As shown in FIG. 6, the sole molding mold 2 is constructed such that a sole molding cavity 6 is formed by an upper mold 18 and a lower mold 19.

As shown in FIG. 7, the mold 2 is formed with a concave surface 22 corresponding to the acute-angled convex design on the sole circumferential surface over the entire inner circumferential surface of the mold, and with burr holes 21. The shape, size, and mutual relationship of the burr holes 21 are formed so as to gradually taper from the lower molded surface 20 through the inside of the mold toward the bottom corner of the concave surface 22, and are formed in multiple numbers over the entire inner peripheral surface of the mold. The spacing and the like are the same as in the case of the burr holes 9 in the first embodiment.

Then, the resin material for the sole is injected into the sole molding cavity 6 of the mold 2 and filled to form the sole. After opening the mold, the molded unit sole is taken out. At this time,
The burr in the burr hole 21 is cut off from the outer peripheral surface of the sole.

Thereafter, the burrs in the burr holes 21 are extracted and removed.

The unit sole manufactured in this manner had an acute-angled convex design on the outer circumferential surface that had not been seen before, but the convex design had no defects in the design at all.

(Effects of the Invention) As explained above, the method of manufacturing a shoe sole with an uneven design of the present invention includes providing a burr hole that communicates with the outside of the mold from the uneven portion of the inner peripheral surface of the mold corresponding to the uneven design. As a result, no air pockets are generated near the uneven parts during molding, making it possible to create soles with not only unnecessarily rounded designs, but also soles with acute-angled uneven designs on the outer surface, which were previously difficult. It can be manufactured reliably without any unevenness or chipping.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the inside of a shoe sole forming mold when the sole of an injection-molded shoe was manufactured according to the method of Example 1 of the present invention. Figure 2 is a sectional view showing the main parts of the sole mold shown in Figure 1, Figure 3 is a view of the sole mold shown in Figure 1 viewed from -F, and Figure 4 is a cross-sectional view showing the main parts of the sole mold shown in Figure 1. Figure 5 is a diagram schematically showing a large number of burr holes formed in the shoe sole mold shown in Figure 5, Figure 5 is a diagram showing burr holes in a modified example, and Figure 6 is a diagram showing a sole of an injection molded shoe according to the method of Example 2. FIG. 7 is a cross-sectional view showing the main parts of the sole mold when manufactured; FIG. 7 is a cross-sectional view showing the inside of the sole mold when the unit sole was manufactured according to the method of Example 3; FIG. Fig. 7 is a sectional view showing the main parts of the shoe sole forming mold, and Figs. 9 and 10 are sectional views showing the main parts of the shoe sole forming mold when the soles of injection molded shoes are manufactured according to the conventional method. It is. In the figure, l, 2...Sole forming molds 3a, 3b...Size l-mold 4...Last mold 5...Bottom mold bottom...Sole forming gap 7...Mold inner periphery Surface 8.22... Concave surface 9.15, 16.21... Burr hole 10... Side mold north face 11... Opening 12... Bank 13... Flap 17... Convex part Surface 18... ] Second side mold 19... Side mold 20... Lower side mold - L side Patent Applicant Achilles Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 1n 1.2 Shoe sole molding solder 11 Riki Sekiguchi β
b Zaid 7-ru F 12 No. 1 4 Last mold 13 Thick skin 5 Tom mold 17 ・Convex e surface 6 Shoes 1M'2 Sky
18 Upper mold 10 Side mold 1 side Fig. 4 Fig. 5 Fig. 6 Fig. 2 Fig. 7\ Fig. 8 Fig. 9

Claims (2)

[Claims] (1) When manufacturing unit shoe soles or injection molded shoe soles with concave and/or convex designs on the outer periphery, burr holes are inserted through the inside of the mold from the upper surface of the lower mold or side mold. A shoe sole mold is used that has a convex portion corresponding to the design on the inner peripheral surface and/or a concave portion that gradually tapers toward the surface, and the material for the sole is injected into the inside of the sole mold. A method for manufacturing a shoe sole with an uneven design characterized by injection injection and filling. (2) It is configured to include a last mold, a bottom mold, and a pair of left and right side molds, and these molds form a sole molding cavity, and the side molds have a burr hole formed from the upper surface of the side mold through the inside of the mold. Convex portions on the inner peripheral surface of the mold corresponding to the uneven design and/
Alternatively, use a shoe sole forming mold that is formed so that it gradually tapers toward the surface of the recess, and that has a bank on the top surface of the side mold at a position inside the opening of the burr hole, and suspend the shoe sole from the last mold. 2. The manufacturing method according to claim 1, further comprising injecting and filling the sole molding cavity with a shoe sole resin material.