JPH0710575B2 - Shoe manufacturing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement in a shoe manufacturing method, in particular, a shoe manufacturing method by a direct injection manufacturing method.

(Prior Art) Conventionally, in golf shoes, soccer shoes, baseball shoes, etc., an insert member is molded as a primary molded product,
A method is known in which after these are placed in a bottom mold, a shoe bottom molding member is injection-injected and secondary molded to manufacture a shoe. The conventionally known methods for manufacturing shoes include the following methods.

That is, as shown in FIG. 13, after a recess is formed in the bottom mold, and the insert member 6 in which the pin-shaped projection 18 having a function as a spacer is pressed in the recess is fitted, A method of manufacturing a shoe by installing a side mold 3 and injecting a shoe sole molding member 13 into a shoe sole forming space 5 is known.

Further, as shown in FIG. 14, a side mold 3 and a bottom mold 4 form a recess 20 for holding the resin cutting step 19 of the insert member 6, and the insert member 6 is fitted and installed in the recess 20. A method of manufacturing a shoe by arranging the last 2 in which the upper member 12 is suspended and then injecting and injecting the shoe sole molding member 13 into the shoe sole molding space 5 is known.

Further, as disclosed in JP-A-54-92441, as shown in FIG. 15, "In a mold for an injection molding machine consisting of a shoe sole covered with an instep cover and an insole, left and right side walls and a bottom die" , A wall-shaped small protrusion 22 smaller than the outer peripheral edge of the bottom mold 21 of the mold, and one or a plurality of cylindrical protrusions 23 formed in the wall-shaped small protrusion 22. Forming a material supply path communicating with the projection 23, fit the leather plate 25 having a through hole 24 into which the cylindrical projection 23 of the bottom mold can be inserted in advance in the small wall projection 22 of the bottom mold 21, .... And the bottom material is supplied from the cylindrical projection to cure and mold the bottom material, and at the same time, the outer sole, the leather plate 25, and the instep 26
A method for manufacturing athletic shoes, characterized in that they are integrally connected with each other, has already been known.

Further, as disclosed in JP-A-55-99201, as shown in FIG. 16, "the inner pressure of the bottom mold 34 is adhered to by the injection pressure at the time of injection molding set on the entire circumference of the shoe sole 33. A sole having a bottom having a thickness and a height and having a hole 33 into which an injection pipe 35 of an injection material can be inserted in a stepped portion close to a non-stepped portion is formed of a material having flexibility and a predetermined hardness. Insert and hold it in the mold,
..Prevents injection material from leaking to the surface side of the sole,
... Injection molding method for shoes having soles. ] Etc. are also known.

(Problems to be Solved by the Invention) However, these conventional shoe manufacturing methods have the following problems.

That is, as shown in FIG. 13, in the method of manufacturing a shoe using a pin-shaped projection having a pressing function and a spacer-like function formed on the insert member, the pin-shaped projection of the insert member If you design with a small number of pins, the synthetic resin that is the shoe sole molding member leaks from the gap between the pin-shaped protrusions and wraps around the grounding surface of the insert member, reducing the yield of molded products. Had.

Therefore, in order to securely hold the insert member in contact with the bottom mold and prevent the shoe sole molding member from wrapping around to the grounding surface side of the insert member when the shoe sole molding member is injection-injected, It is necessary to form a large number of protrusions on the peripheral portion on the upper surface side of the insert member, but this has the disadvantage that the weight of the insert member becomes heavy, and at the same time, the synthetic resin that is the shoe sole molding member is injected and injected. In doing so, these pin-shaped protrusions also impeded the fluidity of the synthetic resin, and there was a drawback that it was difficult to uniformly fill the synthetic resin.

Further, when forming the resin cutting step on the insert member as shown in FIG. 14, in order to securely fit and hold the insert member in the side mold and the bottom mold, the thickness of the resin cutting step should be adjusted. Since it has to be 1.0 to 1.2 mm, there is a problem that the total thickness of the shoe sole itself becomes thick and the weight of the shoe itself becomes heavy.

Further, as in the method for manufacturing shoes disclosed in Japanese Patent Laid-Open No. 54-92441 shown in FIG. 15, for an injection molding machine including a shoe sole covered with an instep and an insole, left and right side walls and a bottom mold. On the upper surface of the bottom die of the mold, a small wall-shaped projection smaller than the outer peripheral edge thereof and one or a plurality of cylindrical projections are formed in the small wall-shaped projection, and also communicates with the cylindrical projection inside the bottom mold. Forming a material supply path,
The bottom plate is fitted with a leather plate having a through hole into which the bottom cylindrical protrusion can be inserted, and then the bottom material is supplied to cure and mold the bottom material and the outer bottom and the leather. The method of manufacturing athletic shoes by integrally joining the plate and the instep is good when using a single natural material such as leather plate, but long fiber reinforced thermoplastics currently on the market. If an insert member that hybridizes (hereinafter abbreviated as FRTP) and synthetic resin causes warpage due to the difference in thermal expansion coefficient, insert it into the cylindrical protrusion formed on the bottom mold (bottom mold). Even if it is used, the warp of the insert member causes a gap between the insert and the bottom mold, so that the cylindrical projection and the through hole formed in the insert member cannot be fitted properly. Injection injection For example, there is a drawback that the product leaks from this portion and wraps around to the ground contact surface side of the insert member, resulting in a significant decrease in the yield of the product. Further, since there are these small protrusions when cleaning the bottom mold, it is necessary to prevent them from being scratched, and there is a drawback that cleaning the bottom mold takes time.

As in the shoe manufacturing method disclosed in JP-A-55-99201 shown in FIG. 16, when the injection port is pulled out after the injection of the synthetic resin is completed, the inner wall of the protrusion and the injection port are filled. There is a problem in that a gap is formed between the synthetic resin and the soil or mud, which is impregnated with water during long-term use and causes deterioration of the internal synthetic resin.

Therefore, recently, there has been a demand for a direct injection manufacturing method that yields good yields not only when using an insert member that uses a synthetic resin material but also when using an insert member that is a hybrid of FRTP and synthetic resin.

(Means for Solving the Problem) The present invention has been made in view of these drawbacks of the related art, and an object thereof is to provide a method for manufacturing shoes, which has a good yield even in combination with any insert member.

That is, a synthetic resin insert member or a hybridized insert member is installed in the shoe sole molding space formed by the last, side mold, bottom mold, etc., and the shoe sole molding member is injected and injected to manufacture shoes. In the method, as the insert member, a FR resin insert member made of polyurethane resin or polyurethane resin, polyamide resin or other thermoplastic synthetic resin is used as a matrix resin.
Using an insert member hybridized with TP, a through hole for injection injection of a shoe sole molding member is provided at an arbitrary position on the ground contact surface side of the insert member, and a hole communicating with the through hole is provided. A hollow protrusion is integrally formed, and the diameter of the hole leading to the through hole is made thin in the body part of the insert member, and an insert member in which the hole diameter is made large in the hollow protrusion is prepared and formed in the bottom mold. After forming a recess for fitting and installing the hollow projection formed on the insert member at the gate portion for injecting and injecting the shoe sole molding member, after fitting and installing the hollow projection of the insert member on the recess After arranging the side mold and then installing the last in which the upper member is suspended, the polyether block amide resin, which is the shoe sole molding member, is attached to the hollow protruding portion of the insert member. By injecting injected into Luo sole molding void, a method of manufacturing a shoe, characterized in that the sole molding member and the insert member and the upper member is molded simultaneously integrally.

The insert member may be installed on one or both of the front stepping part and the heel part of the shoe sole, or may be formed and installed in an arbitrary shape that substantially matches the shape of the shoe sole.

Further, since the gate portion for injecting and injecting the shoe sole molding member can be arranged at the place where the insert member is installed, it is possible to dispose a plurality of gate portions if necessary.

Regarding the shape of the hollow protrusion integrally formed with the insert member and the recess of the bottom mold for fitting and setting in the hollow protrusion, a cylindrical shape, a point shape or a cleat shape used in soccer shoes, etc. It is possible to select a stud shape or any other shape.

The insert member and the shoe sole molding member may be made of a combination of the same or different materials, or a combination of materials of the same color or different colors.

(Operation) With the configuration as described above, the following operation occurs in the present invention.

That is, in the conventional manufacturing method, there is a problem of leakage of injection-molded synthetic resin, which is a shoe sole molding member, due to warpage that tends to occur when using synthetic resin insert members or hybridized insert members. In the method for manufacturing a shoe according to the invention, a through hole for injection injection of the shoe sole molding member is provided on the ground contact surface side of the insert member, and a hollow protrusion having a hole communicating with the through hole is integrally formed. Further, since the hole diameter of the hole communicating with the through hole is made thin in the main body portion of the insert member and the hole diameter is made large in the hollow protruding portion, the shoe sole molding member passes through the runner formed in the bottom mold, and the insert member When injection is injected from the hollow protruding part of the hollow sole into the space for molding the sole, when the hollow protruding part passes through the small hole part of the main body part of the insert member, the shoe sole Since the injection speed of the shaped member is accelerated in the portion having a small hole diameter, the shoe sole molding member is injected and injected into the shoe sole molding cavity at a higher speed, so that the shoe is molded to every corner of the shoe sole molding cavity. Since the sole molding member is spread and the sole molding member is pressed by the insert member at a high pressure, even if the insert member is slightly warped, it is reliably pressed by the bottom mold to prevent leakage of the sole molding member. To do.

Furthermore, since a recess for inserting and injecting the hollow protrusion formed in the insert member is formed in the gate portion for injection-injecting the shoe sole molding member formed in the bottom mold, the recess of the insert member is formed in the recess. By fitting and installing the hollow protrusion, even when the insert member is slightly warped, it is possible to prevent the hollow protrusion from leaking when the synthetic resin, which is the shoe sole molding member, is injected.

Further, even if the insert member is slightly warped, since the hollow projecting portion is formed integrally with the insert member, the injection injection pressure can be maintained without lowering when the synthetic resin is injected and injected, as shown in FIG. As described above, since the pressure of the synthetic resin that collides with the bottom of the last in which the upper member is suspended acts to push down the insert member toward the bottom mold, the leakage of the synthetic resin due to the warpage as in the conventional insert member does not occur. The point that it occurs can be almost eliminated.

Further, due to the molding pressure at the time of molding, characteristic values such as adhesive strength and peeling strength between the insert member and the shoe sole molding member are improved.

Further, in the present invention, the weight is heavy as in the conventional insert member in which a large number of pin-shaped projections are erected, and the fluidity of the synthetic resin is not hindered by the pin-shaped projections, and the weight is light. In addition, shoes with good moldability can be manufactured.

Moreover, unlike the conventional insert member, it is not necessary to form the resin cutting step with a thickness of 1.0 to 1.2 mm, so it has never been said that the total thickness of the shoe sole itself will be thick, and the shoe sole itself is lightweight. It can be realized.

Further, in the present invention, since a hybrid FRTP sheet can be used when forming the insert member as described above, the rigidity and snapping property of the shoe sole can be improved. .

Further, unlike the conventional manufacturing method, it is not necessary to form a small wall-shaped projection for holding and fitting the insert member on the upper surface of the bottom mold, and since it is not in the form of a cylindrical projection formed in the wall-shaped projection. The bottom mold can be easily cleaned without damaging these small protrusions when cleaning the bottom mold.

Further, when using a synthetic resin or a hybridized insert member, even if warpage occurs, it is possible to reduce the manufacturing cost without saying that the synthetic resin leaks and the yield decreases as described above. is there.

(Example) An example relating to the method for manufacturing shoes of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, the last 2,
A synthetic resin insert member 6 or a hybridized insert member 6 is installed in a shoe sole molding space 5 formed by the side mold 3 and the bottom mold 4 and the like.
In the method of manufacturing a shoe 1 by injecting a shoe sole molding member, as the insert member 6, an insert member 6 made of polyurethane resin, a polyurethane resin, a polyamide resin or other thermoplastic synthetic resin is used as a matrix resin.
By using the insert member 6 hybridized by FRTP, a through hole 8 for injection injection of a shoe sole molding member is provided at an arbitrary position on the ground contact surface side 7 of the insert member 6, and a hole communicating with the through hole 8 is formed. An insert member 6 in which a hollow protrusion 9 of an arbitrary shape is integrally formed, and the diameter of the hole 8a communicating with the through hole 8 is thin in the main body of the insert member, and the diameter of the hole 8b in the hollow protrusion 9 is large. And a recess 11 for fitting and installing a hollow protrusion 9 formed in the insert member 6 at the gate portion 10 for injecting and injecting the shoe sole molding member formed in the bottom mold 4, After fitting and installing the hollow projecting portion 9 of the insert member 6 in the recess 11, the side mold 3 is arranged, then the last 2 in which the upper member 12 is suspended is installed, and then the shoe sole molding member 13 of polyether. block By injection-injecting the mid resin from the hollow projecting portion 9 of the insert member 6, the shoe sole molding member 13 is filled from the through hole 8 of the insert member 6 into the shoe sole molding void 5, and the shoe sole molding A shoe manufacturing method is characterized in that the member 13, the insert member 6 and the upper member 12 are simultaneously and integrally molded to form the shoe 1.

Also, as shown in FIGS. 4 and 10, the insert member 6
Can be manufactured by installing the front stepping part 15 of the shoe sole 14 on both or either of the heel parts 16.

Further, although not shown, the insert member 6 is a shoe sole.
It is also possible to manufacture by installing it in an arbitrary shape that substantially matches the shape of 14.

Also, as shown in FIGS. 10 to 12, the insert member 6
The shape of the hollow protrusion 9 formed on the bottom mold and the recess 11 for fitting and setting formed on the bottom mold can be any arbitrary shape such as a tubular shape 9a, a point shape 9b used in soccer shoes or the like, a cleats shape 9b, a stud shape 9b or any other It is also possible to form and manufacture it.

For example, in the case of a tubular shape 9a, it is used for golf shoes and the like,
This protrusion can be removed when the shoe is molded, or can be left as it is.

When manufacturing soccer shoes or the like, the protrusion 9 formed on the insert member 6 is formed into a tubular shape 9a, a point shape 9b, a cleats shape 9b, a stud shape 9b, etc. as described above, and these hollow protrusions are formed. Since a hole for injecting and injecting the synthetic resin which is the shoe sole molding member 13 is formed in 9, the hole and the through holes 8, 8a, 8b when the injecting and injecting the synthetic resin from the hollow protrusion 9 are formed. By filling the voids with the synthetic resin, the voids can be used in the same manner as ordinary points or cleats formed at other locations, and therefore the labor of deletion can be omitted.

As the insert member 6, polyurethane resin,
Polyamide resin may be used, and the shoe sole molding member 13 may be formed using thermoplastic synthetic resin such as polyether block amide resin.

For example, when considering wear resistance, thermoplastic polyurethane resin (TPU) is used as the insert member, and polyether block amide resin (registered trademark of PEBAX Toray Co., Ltd.) as the shoe sole molding member. By using, the adhesion with the thermoplastic polyurethane resin is improved, and in particular, the weight of the shoe itself can be reduced.

Further, as shown in FIG. 7, it is possible to form a pin-shaped projection 18 in order to act as a spacer with the last in which the upper is suspended on the upper surface side of the insert member.

In addition, as the hybridized insert member, as shown in FIGS. 8 and 9, carbon fiber, aramid fiber, glass fiber, silicon carbide fiber, alumina fiber and other reinforcing fiber materials are individually used as FRTP,
Or, it can be used by appropriately combining and processing it into a woven fabric, a non-woven fabric, a mat, a draw-out, etc. and impregnating it with a polyurethane resin, a polyamide resin or other thermoplastic synthetic resin as a matrix.

It is also possible to manufacture the insert member and the shoe sole molding member from materials of the same color or different colors.

(Effect of the Invention) In the method for manufacturing a shoe of the present invention, a hollow protrusion having an arbitrary shape in which a through hole for injection injection of a shoe sole molding member is provided on the ground contact surface side of the insert member, and a hole communicating with the through hole is provided. Since the part is integrally formed, and the hole diameter of the hole leading to the through hole is made thin in the body part of the insert member and the hole diameter is made large in the hollow protruding part, the shoe sole molding member is formed in the bottom mold. When it is injected through the hollow protruding part of the insert member into the space for molding the sole by passing through the liner, and when passing through the small hole part of the body part of the insert member from the part with the large hole diameter of the hollow protruding part. Since the injection speed of the shoe sole molding member is accelerated in a portion having a small hole diameter, the shoe sole molding member is injected and injected into the shoe sole molding cavity at a higher speed. Various shoe sole moldings Since the shoe sole molding member spreads and presses the insert member with a high pressure, even if the insert member is slightly warped, it is reliably pressed by the bottom mold, so that the effect of preventing the shoe sole molding member from leaking is extremely high. It will grow.

Further, a recess for fitting and installing a hollow protrusion formed on the insert member, which is a gate portion for injection-injecting the shoe sole molding member formed on the bottom mold, is formed, and the hollow protrusion of the insert member is formed in the recess. After fitting and installing the parts, arranging the side mold, and installing the last that suspends the upper member, when the synthetic resin that is the shoe sole molding member is injected and injected from the hollow protrusion of the insert member, Unlike the manufacturing method, since the synthetic resin is prevented from leaking due to the hollow protrusion, the yield of products is significantly improved.

Further, in the present invention, since it has not been said that the weight becomes heavy like an insert member in which many conventional pin-shaped projections are erected and the fluidity of the synthetic resin is hindered by the pin-shaped projections, it is lightweight. In addition, it is possible to manufacture a shoe having a good external shape and design formability.

Moreover, unlike the conventional insert member, it is not necessary to form the resin cutting step with a thickness of 1.0 to 1.2 mm, so it has never been said that the total thickness of the shoe sole itself will be thick, and the shoe sole itself is lightweight. It can be realized.

In the present invention, a hybrid FRTP sheet can be used when forming the insert member as described above, so that the rigidity of the shoe sole can improve the snapping property. .

In addition, in the shoe manufacturing method according to the present invention, since the thickness of the shoe sole molding member can be appropriately selected, it is possible to prevent the spike pin from being pushed up in a golf shoe or the like.

The shoe manufacturing method of the present invention can be applied to shoes other than those in the examples.

[Brief description of drawings]

FIG. 1 is a sectional view showing a method for manufacturing a shoe according to the present invention, and FIGS. 2 to 3 are sectional views showing one step of a method for manufacturing a shoe according to the present invention, FIGS. 4 and 10. Is a plan view showing a shoe sole according to the present invention, FIGS. 5 and 8 are perspective views showing an insert member according to the present invention, and FIGS. 6 and 9 are views showing an insert member according to the present invention. FIG. 4 is a cross-sectional view taken along the line AA in FIG.
FIGS. 12 and 13 are cross-sectional views of the main part of the shoe according to the present invention, FIG. 11 is a cross-sectional view of the insert member of the BB portion of FIG. 10 which is another embodiment of the present invention, and FIGS. FIG. 16 is a cross-sectional explanatory view showing one step of a conventionally known shoe manufacturing method. 1 : shoe, 2: last, 3: side mold, 4: bottom mold, 5: shoe sole molding void, 6: insert member, 7: ground surface side, 8: through hole, 8a: hole, 8b: hole, 9: Hollow protruding portion, 10: Gate portion, 11: Recessed portion, 12: Upper member, 13: Shoe sole molding member, 1
4: Sole, 15: Front step, 16: Heel, 17: Spike, 1
8: Pin-shaped protrusion, 19: Step for resin cutting, 20: Recess, 21:
Bottom type, 22: Small wall-shaped projection, 23: Cylindrical projection, 24: Through hole, 25: Leather plate, 26: Instep, 27: Runner, 32: Shoe sole, 33: Hole, 34: Bottom mold, 35: Injection tube.

Claims (2)

[Claims] 1. A synthetic resin insert member or hybridized insert member is installed in a shoe sole molding space formed by a last mold, a side mold, a bottom mold or the like, and the shoe sole molding member is injected and injected. In the method for manufacturing shoes, as the insert member, an insert member made of polyurethane resin or an insert member hybridized with FRTP using a thermoplastic resin such as polyurethane resin or polyamide resin as a matrix resin is used. A through hole for injection injection of the shoe sole molding member is provided at an arbitrary position on the ground contact surface side of the shoe, and a hollow protrusion having an arbitrary shape provided with a hole communicating with the through hole is integrally formed, and a hole communicating with the through hole is formed. Prepare an insert member that has a smaller hole diameter in the body of the insert member and a larger hole diameter in the hollow protrusion. At the same time, a recess for fitting and installing a hollow projection formed on the insert member, which is a gate portion for injecting and injecting the shoe sole molding member formed on the bottom mold, is formed, and the hollow projection of the insert member is formed in the recess. After the parts are fitted and installed, the side mold is arranged, and then the last in which the upper member is suspended is installed, and then the polyether block amide resin which is the shoe sole molding member is molded from the hollow protruding portion of the insert member to the shoe sole molding. A method for manufacturing a shoe, wherein the shoe sole molding member, the insert member, and the upper member are integrally molded at the same time by injection injection into the space for use. 2. The hollow projecting portion formed on the insert member and the recessed portion for fitting and setting formed on the bottom mold are tubular, point-shaped, cleats-shaped and stud-shaped used in soccer shoes and the like. The method for manufacturing a shoe according to claim 1, wherein the shoe is formed into an arbitrary shape.