JPH03275002A - Injection-molded shoes with heel and its manufacture - Google Patents

Abstract

PURPOSE:To obtain shoes having a sufficient strength, an excellent flexibility and a good appearance and also making a sufficient faculty of shank, by forming the shoe bottom by an extruded resin and making the outsole, insole, the heel, the shank, etc., as a unit. CONSTITUTION:The shoe bottom 1 is molded with resin 20 injected from the injected resin pass 7 of a heel 2 to make a solid of heel 2, insole 3, shank 5, etc. The protrusion 9 holding the shank supports the shank 5 from the lower side. The shank 5 has an L-shape bent by nearly 90deg. at one end thereof and a central protrusive line 12 is provided longitudinally at the lower side (shoe bottom side). This protrusive line 12 is useful for increase of the strength, improvement of fluidity of the resin, and improvement of cohesiveness mold. The hanging down piece 10 of the short side of the shank is inserted into the insertion hole 8 of the shank. As the injected resin 20 is poured in the insertion hole 8 and cured, the shank 5 and the heel 2 are especially fast bonded. And, the shank 5 is always kept at the position near the middle bottom for the presence of the protrusion 9, and hence, it is not exposed on the surface of the shoe bottom.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to shoes with a relatively high heel, mainly for women and men, and a method for manufacturing the same.

More specifically, the present invention relates to a completely new and innovative technique for manufacturing shoes with heels by injection molding.

(Prior Art) Traditionally, shoes with heels, such as high heels, have been traditionally manufactured using the following methods, for example, as referred to in "Basic Knowledge of Good Shoes" (edited by Japan Shoe Research Association), pages 19 to 22. Then, the outsole is cut, skived, huffed, and the insole is pasted with adhesive (
It has been manufactured mainly by hand, including various processes such as shank attachment (or nailing) and heel attachment (recently, a heel attachment machine is used). Therefore, workers who made this type of shoe required a high level of craftsmanship.

(Invention or problem to be solved) However, in recent years, as the industrial structure has changed, the number of young people employed in manual labor has been decreasing. In the shoe manufacturing industry, in order to deal with this problem, it is necessary to develop a technology that allows even unskilled workers to manufacture shoes that are satisfactory in terms of appearance, quality, productivity, price, etc. From this point of view, it has been sought to apply the injection molding method, which is considered to be more advantageous, to fields and ranges where it has not been used conventionally.

However, there has not yet been an example of manufacturing shoes with heels by injection molding.

On the other hand, the conventional manufacturing method for such shoes: ■ requires a large number of work steps, resulting in high manufacturing costs; ■ requires skilled labor; ■ tends to cause variations in shoe quality because it depends on the skill of the worker. ■It has disadvantages such as poor working environment due to excessive use of adhesives.

Therefore, the present inventor decided to develop a method for manufacturing shoes with heels by injection molding. During the development process, it was necessary to consider the following points.

(1) Prepare a mold with an appropriate surface for the strength of the shoe, especially the heel, and form the entire lower part of the shoe, including the sole, heel, etc., according to the conventional injection molding method,
It is technically possible to make a shoe appearance with a heel.

However, in shoes with a heel, the load of the human body may be applied directly to the heel, so the heel must be extremely strong. If the entire lower part of the shoe is molded using a commonly used injection resin with good flexibility, such as a polyvinyl chloride compound, the resin material is flexible, so a heel strong enough to withstand the load of the human body cannot be obtained. I can't.

On the other hand, if a hard resin such as ABS resin is used, it may not be able to withstand the load of the human body, it lacks flexibility, and it is technically difficult to apply the injection molding method.

(2) Regarding weight reduction of shoes, if the entire sock group is molded with conventional injection resin,
The total weight of the shoes is heavy. By providing a cavity in a part of the sole, etc., it is possible to reduce the weight, but on the other hand, the strength is significantly reduced, and the shoe becomes increasingly unable to withstand the load of the human body.

(3) Regarding deformation during molding If a method is adopted in which the sole and heel are integrally injection molded at the same time, due to the difference in cooling time between the two, large shrinkage distortion is likely to occur, causing warping, deformation, etc.

(4) Regarding the placement of the shank In the case of shoes with a heel, the shank is generally inserted under the midsole in order to supplement the strength from the heel part to the stepping part and to prevent the shoe from warping when walking. Is there a need to do that?

Therefore, during the injection molding process, it is necessary to consider a method of fixing the shank so that it is always held at a proper position without being displaced by injection pressure. It is also necessary to consider the arrangement of the shank so that the flow of the injected resin is not significantly restricted by the presence of the shank.

(5) Integration of each part Injection molding is not only used to form the sole of the shoe, but also requires a structure that integrates the sole, midsole, heel, shank, etc.

The present invention has been made in consideration of the above-mentioned circumstances, and one object of the present invention is to provide a shoe sole that is made of injection resin;
A new shoe with an integrated insole, heel, shank, etc., has sufficient strength to withstand the load of the human body, excellent shoe flexibility, and a good appearance, and the shank can fully perform its functions. To provide an injection molded shoe having a heel that can be easily reduced in weight.

Another object of the present invention is to reliably manufacture shoes having excellent heels as described above by injection molding without causing defects such as deformation or poor appearance after molding. An object of the present invention is to provide a method for manufacturing injection molded shoes with heels.

(Means for Solving the Problems) The present invention, first of all, comprises: an insole integrated with a heel; an injection resin passage leading from the bottom of the heel to the upper surface of the heel; and a heel side of the heel from the exit of the passage. A heel having a shank insertion hole formed on the upper surface, a shank holding convex portion provided on the upper surface of the heel on the toe side from the exit of the passage, and a shank having one side hanging down on the heel side, the hanging side being inserted into the heel side. The shank is inserted into the hole and held between the insole and the heel, and the injection resin is injected from the heel passage to form the mold.
The present invention relates to an injection molded shoe having a sole comprising the insole, heel and shank integrated together, and a heel comprising a top lift attached to a lower part of the heel so as to close the passage.

The present invention also provides a method for manufacturing shoes, including placing the heel in the recess of a bottom mold having four heel fixing parts on the upper surface, and then inserting one side of the shank into the shank insertion hole of the heel. Insert the insole and the heel in one piece into a last mold, and form a sole molding gap with the bottom mold and the last mold, and then inject the resin from the injection port facing the heel fixing recess. The present invention relates to a method of manufacturing an injection molded shoe with a heel, comprising: molding the sole by injecting into the sole molding cavity through a heel passage, and finally attaching the top lift to the heel.

(Summary of the Invention) The shoe with a heel of the present invention is composed of a heel, an insole, a sole, a heel, and a top lift, and may further include decorative parts, reinforcing heel, etc. due to design requirements. .

The insole and the laces may be made of conventional materials such as natural leather or synthetic leather, and the two may be integrated using conventional techniques such as bonding with an adhesive or nail linking.

The sole may be made by injection molding, and the injection resin may utilize resin materials used in conventional injection molded shoes, such as polyvinyl chloride compounds and thermoplastic rubber.

The heel is made of a hard material strong enough to withstand the load of the human body, such as ABS resin, and manufactured in a separate process.

The heel has an injection resin passageway for molding the sole,
It is preferably formed straight so that it communicates from the lower part of the heel (usually the lower surface) to the upper surface of the heel. Preferably, the diameter of the passageway corresponds to the diameter of the protrusion in the heel placement recess described below.

Further, the heel has a shank insertion hole formed on the upper surface of the heel on the heel side from the exit of the passage, and a shank holding convex portion on the upper surface of the heel on the toe side from the exit of the passage. The insertion hole need only have a hole structure that allows the hanging side of the shank to be inserted therein, and the holding protrusion may be a protrusion that holds the inserted shank at a position near the midsole and hangs therefrom. Moreover, it is preferable that the convex portion is a small protrusion that does not restrict the flow of the injected resin too much.

The shank may be of any shape with one side hanging down on the heel side; for example, a shank with a cross section bent at about 90° C. may be used. The shank is preferably formed longitudinally on the lower side (sole side) with a central protrusion from the viewpoint of improving strength, increasing adhesive area, and improving fluidity.

The shank is held between the insole and the heel with one side of the hanging end (the short side of the L-shaped shank) inserted into the insertion hole of the heel and the remaining part positioned above the convex part.

Finally, a top lift is attached to the bottom of the heel so as to close off the passage.

Shoes are manufactured by the method of the present invention using specially shaped bottom molds, last molds, etc., and following general manufacturing procedures for injection molded shoes, except for heel placement, shank placement, top lift attachment, etc. It will be done.

The bottom mold used in the method of the present invention has a heel fixing recess in the upper surface of the mold in which the heel is accommodated, and an injection port leading to an injection molding machine is exposed to the recess. Preferably, a protrusion corresponding to the size of the injection resin passage is provided on the bottom surface of the recess, and an injection port is formed on the upper surface of the protrusion.

Therefore, according to the method of the present invention, the heel is first placed in the recess in the top surface of the bottom mold, adhesive is applied to the top surface of the heel if desired, and then one side of the shank is inserted into the shank insertion hole of the heel, and the remaining The part is positioned above the holding convex part, while the insole and the fins are hung into the last mold, joined together with hot melt adhesive, etc. If necessary, the surface is puffed or a treatment liquid is applied, etc., and then the bottom mold and The last mold is pressed to form a predetermined sole molding cavity, and then the injection resin is injected from the injection port of the recessed part of the heel through the resin passage of the heel into the sole molding cavity to form the sole. An injection molded shoe with a heel can be produced by molding and finally adding a top lift to the bottom of the heel.

(Function) In the present invention, since the heel and the sole are manufactured separately, the material for the heel can be selected arbitrarily, and the number of heel materials is not limited. Therefore, by appropriately selecting the material, it is possible to create a heel with sufficient strength to withstand the load of the human body, even in high-heeled shoes.

In the present invention, only the sole is injection molded, and the sole and heel are simultaneously integrated, so that the cooling time is almost uniform, and uneven shrinkage deformation does not occur after molding.

The present invention makes it possible to reduce the weight of the entire shoe by constructing the heel itself from a material that has a lower specific gravity than the injection resin used for shoe soles, and by making hollows at appropriate locations inside the heel if necessary. Ru.

In addition to the above-mentioned effects due to the separate heel, the present invention has the following more important effects.

In the present invention, the sole, insole, shank, heel, etc. are integrated by resin injection at the same time as the sole is molded, and the adhesive strength between these members is high.

In particular, since the shank is injection molded while being inserted into the shank insertion hole on the heel side from the passage exit on the upper surface of the heel, some of the injection resin injected from the upper surface of the heel may enter the shank insertion hole. , fill it there and harden.

Therefore, the shank and heel are very firmly connected.

Furthermore, in the present invention, the shank is injection molded in a state where it is held above the passage exit by the convex part on the toe side of the upper surface of the heel, so that the image side part of the shank is not injected with the injection resin during molding. Even if the shank is pushed up toward the midsole due to the pressure of be converted into

In addition, in the present invention, the passage of the injected resin is blocked by the top lift, so that it cannot be recognized from the outside that the resin has been injected from the heel, and the shoe has a very good appearance. It will be done.

(Examples) Hereinafter, the present invention will be explained in more detail by showing examples, but the following examples do not limit the number of ships of the present invention.

The shoes of this embodiment are women's shoes having a heel height of about 4 to 7 cm, as shown in FIG. 1 indicates a sole made of a polyvinyl chloride compound or thermoplastic rubber, and 2 indicates a heel made of ABS resin or the like and covered with leather due to design requirements. In addition, 3 indicates the insole, 4 indicates the leather lining, 5 indicates the shank, and 6 indicates the top lift.

The sole 1 is molded from resin 20 injected from the injection resin passage 7 of the heel 2, and integrates the heel 2, the midsole 3, the shank 5, etc.

As shown in FIG. 2, the heel 2 has the above-mentioned resin passage 7 that penetrates from the lower surface of the heel to the upper surface 11 of the heel, and a shank insertion hole 8 is formed in the upper surface of the heel on the image side from the exit of the passage 7. Furthermore, a shank holding convex portion 9 is provided on the heel upper surface 11 on the toe side from the outlet of the passage 7.

The resin passage 7 serves as an injection path for the injection resin 20, and has a size that allows a protrusion 18 of the bottom mold 15 described below to be inserted into the resin passage 7. Reference numeral 13 indicates an injection port facing above the protrusion. Further, the resin passage 7 may be one into which the base of the top lift 6 is inserted. Reference numeral 16 indicates the base tip of the top lift 6 that is opened in the inserted state, and is located slightly below the injection port 13.

The shank insertion hole 8 is located on the hanging side 10 (
This is a recess into which a piece (Fig. 1) can be inserted.

The shank holding protrusion 9 supports the shank 5 from below, and in order to minimize the restriction and restraint on the flow of the injected resin 20, as shown in FIG. It is provided only in the department.

Further, as shown in FIG. 4, the shank 5 has an L-shape bent at approximately 90 degrees at one end, and has a central protrusion 12 provided on the lower side (sole side) in an elongated direction. The protrusions 12 are useful for improving strength, resin flowability, adhesion, and the like. Reference numeral 10 indicates one side of the short side of the shank, which is inserted into the shank insertion hole 8.

Further, the midsole 3 and the lace 4 are integrated with adhesive or the like. Furthermore, the top lift 6 is a part with a T-shaped cross section.
It is made of various materials that have better wear resistance and elasticity than the heel 2.

Note that 21 indicates a decorative component on the surface of the sole. As shown in FIG. 8, the component 21 is injection molded while being inserted into an annular projection 23 provided on the upper surface of the bottom mold 15 described below. Decorative parts! A component 22 as shown in FIG. 9 may be used, and in this case, the component 22 is injection molded while being inserted into a recess 24 provided on the upper surface of the bottom mold 15. The shape, pattern, etc. of the decorative parts are changed as appropriate from a design standpoint, and a corresponding mold is used.

When such a decorative part is provided on the lower tread portion of the shank 5, it can prevent the shank 5 from coming into contact with the upper surface of the bottom mold 15 during injection molding, and the shank 5 being exposed to the sole surface of the shoe product. This is more advantageous because it completely avoids this.

Next, the manufacturing process of the shoes of the example will be described.

First, a bottom mold 15 as shown in FIG. 5 is prepared. The mold 15 has a heel fixing recess 25 having a shape corresponding to the shape of the heel 2 formed on the upper surface. As clearly shown in FIG. 7, the recess 25 is provided with a protrusion 18 on the bottom surface of a size that fits into the passage 7 of the heel 2. The protrusion 18 has an injection runner 19 formed therein that communicates with the injection molding machine, and has an injection port 13 serving as a runner outlet at its upper end.

As shown in FIG. 5, the heel 2 is placed in the recess 25 of the bottom mold 15, and the resin passage 7 is inserted into the protrusion 18.Then, the hanging side 10 of the shank 5 is inserted into the heel 2. While inserting it into the hole 8, the remaining part of the shank 5 (the long side of the L shape) is placed on the convex part 9. At this time, it is preferable to hold the shank 5 so that it is located as close to the middle bottom as possible, as shown in FIG. Furthermore, decorative parts 21 and the like are also arranged as shown in FIG.

On the other hand, the insole 3 and the laces 4 are suspended in the last mold 14, and they are glued together with hot melt adhesive, and then the toe part is smoothed with a belt sander that has slanted folds.
In order to ensure adhesive strength, the lower surface of the midsole 3 and the surface of the shoe sole 4 that connects to the sole 1 are surface-huffed or coated with a treatment liquid.

Next, the last mold 14 is pressed against the bottom mold 15 to form a sole molding cavity 17, and then the injection resin 2
0 is injected into the gap 17 from the injection port 13 of the injection runner 19 through the passage 7 to fill it and form the sole 1. At the same time, the sole 1, the heel 2, the midsole 3 and the shank 5 are injected.
etc. will be integrated. At this time, the resin 20 enters the insert 68 and hardens, so that the shank 5 and the heel 2 are particularly firmly connected. Further, due to the presence of the convex portion 9, the shank 5 was always held at a position close to the midsole and was not exposed to the surface of the sole.

Finally, a top lift 6 was attached to the lower part of the heel 2 so as to close the passage 7, thereby completing a shoe product having a heel.

The shoes of the obtained examples had sufficient strength to withstand the load of the human body even with high heels, and had excellent shoe flexibility. In addition, after molding, non-uniform shrinkage deformation did not occur, the product had a good appearance, and the shank function was fully demonstrated. Moreover, the entire shoe was lightweight.

(Effects of the Invention) As explained above, the present invention provides a novel injection molded shoe whose sole is made of injection resin and has a heel in which the sole, midsole, heel, shank, etc. are integrated. be done.

The injection molded shoes of the present invention have sufficient strength to withstand the load of the human body even when made with high heels, and
The shoe has excellent flexibility due to the use of injection resin, and also has a good appearance without uneven shrinkage and deformation after molding.

Further, since the shoe of the present invention has a shank held in a predetermined position, it can fully exhibit its function as a shank.

Furthermore, the shoe of the present invention can easily reduce the weight of the entire shoe by selecting the heel material, making the inside of the heel hollow, etc.

Furthermore, the shoes of the present invention have a very good appearance due to the addition of a top lift.

Furthermore, according to the present invention regarding a shoe manufacturing method, shoes having excellent heels as described above can be reliably manufactured by injection molding without causing defects such as deformation or poor appearance after molding. You can get the effect of being able to do it.

In particular, according to the method of the present invention, the bonding strength between the sole, midsole, heel, shank, etc. is high, and in particular, the shank and heel are bonded very firmly due to the injection resin flowing into and filling the shank insertion hole. You can get the effect of

Furthermore, according to the method of the present invention, the shank is not exposed on the sole surface of the shoe, and is always held close to the midsole and integrated with the sole resin, so that the function of the shank is fully exerted. It is also possible to stably provide shoes that are durable and do not cause problems in terms of appearance.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a shoe with a heel according to an embodiment of the present invention, FIG. 2 is a sectional view showing a heel used in the shoe of FIG. 1, and FIG. 4 is a sectional view showing the shank used in the shoe shown in FIG. 1, FIG. 5 is a sectional view showing the sole molding process in manufacturing the shoe shown in FIG. 1, and FIG. A cross-sectional view along the line Vl-VI, FIG. 7 is a cross-sectional view showing the vicinity of the lower part of the heel placed on the bottom mold in FIG. 5, and FIG. 8 shows the decorative parts placed on the bottom mold in FIG. 5. Cross-sectional view FIG. 9 is a cross-sectional view showing another example of arrangement of decorative parts. In the figure, l...Sole 2...Heel 3...Insole 4...Flip 5...Shank 6...Top lift 7...Injection resin passage 8...Shank insertion Hole 9...Shank holding convex portion 10...Drooping side 11...Heel top surface 13...Ejection port 14...Last mold 15...Bottom mold 16...Top lift upper end 17... Sole molding gap 18...Protruding portion l 9 ・ 20 ・・Injection gate・Injection resin 25 ・・Heel fixing recess

Claims (2)

[Claims] (1) An insole integrated with the heel, an injection resin passage leading from the bottom of the heel to the top of the heel, a shank insertion hole formed on the top of the heel on the heel side from the exit of the passage, and a toe from the exit of the passage. a heel having a shank holding convex portion provided on the upper surface of the side heel; and a shank having one side hanging down on the heel side, the hanging side being inserted into the insertion hole and held between the insole and the heel. and molding by injecting injection resin from the heel passage,
An injection molded shoe having a sole comprising the insole, a heel and a shank integrally, and a heel comprising a top lift attached to a lower part of the heel so as to close the passage. (2) An insole integrated with the heel, an injection resin passage leading from the bottom of the heel to the top of the heel, a shank insertion hole formed on the top of the heel on the heel side from the exit of the passage, and a toe from the exit of the passage. a heel having a shank holding convex portion provided on the upper surface of the side heel; and a shank having one side hanging down on the heel side, the hanging side being inserted into the insertion hole and held between the insole and the heel. and molding by injecting injection resin from the heel passage,
A method for manufacturing a shoe comprising a sole formed by integrating the insole, heel and shank, and a top lift attached to a lower part of the heel so as to close the passage, the method comprising: a heel fixing recess on the upper surface; The heel is placed in the recess of the provided bottom mold, and then the hanging side of the shank is inserted into the shank insertion hole of the heel, while the insole and the heel are suspended in the last mold, and A sole molding cavity is formed by the bottom mold and the last mold, and then injection resin is injected from an injection port facing the heel fixing recess into the sole molding cavity through the resin passage of the heel to form the sole. A method of manufacturing an injection molded shoe having a heel, comprising: molding the shoe, and finally attaching the top lift to the heel.