JPH04272702A - Injection molded shoes and their manufacturing method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molded shoe in which a multilayer sole is integrally molded on the lower part of a shoelace, and a method for manufacturing the same.

0002

2. Description of the Related Art Conventionally, injection molded shoes in which a multi-layer sole is integrally molded on the lower part of a shoe cover have been used, for example, as shown in FIG. 14, a two-layer sole 03 consisting of an outsole 01 and a midsole 02 A cylindrical contact surface protrusion 08 made of an outsole molding material 06 and a midsole molding material 07 of a different color and/or different nature, and a tape-shaped protrusion 08, are formed on the bottom part 04 and peripheral part 05 of the shoe sole 03. The peripheral edge side protrusions 09 are each integrally provided, so that different colors and/or different expressions on the contact surface side of the sole 03 can be visually recognized on the peripheral edge side,
There are also shoes with improved design and soles with improved slip resistance and abrasion resistance.

[0003] In manufacturing these shoes, Figs.
As shown in the figure, first place the outsole 01 on the sole design surface 010.
A cylindrical annular projection 012 for forming the contact surface side projection 08 provided on the bottom 04 of the sole 01 and a tape-shaped annular projection for forming the peripheral edge side projection 09 provided on the peripheral edge 05 of the same sole 01 on the peripheral edge design surface 013. Bottom mold 015 with 014 protruding and dummy last 0 for outsole type 01
After forming an outsole molding cavity 017 inside and fitting them together, the outsole molding material 06 is filled into the outsole molding cavity 017 to mold the outsole 01, and then the dummy last 016 is again molded. Instead, after fitting the side mold 018 and the main body last 020 into which the sleeve cover 019 is suspended, forming a midsole molding cavity 021 inside, this midsole molding cavity 021
A midsole 0 that is filled with an outsole molding material 06 and a different color and/or different midsole molding material 07 and has a contact surface side projection 08 and a peripheral edge side projection 09.
2.

0004

[Problems to be Solved by the Invention] By the way, in conventional injection molded shoes, a tape-shaped annular protrusion 014 provided on the peripheral edge 05 of the outsole 01 protrudes from the peripheral edge design surface 013 during shoe manufacturing. bottom mold 0
15 is used, the midsole molding material 07 flows into the annular protrusion 014 during molding of the midsole 02, and after demolding, the midsole molding material 07 flows into the annular protrusion 014 and creates an out-hole, generally called a so-called cut groove, around the peripheral edge side protrusion 09 after demolding. A peripheral portion 05 of the sole 01,
A groove is formed to partition the peripheral edge side protrusion 09. As a result, the design of the peripheral edge 05 of the shoe is degraded, and dust, mud, etc. tend to adhere to the narrow groove, which is difficult to clean.

[0005] In addition, as described above, conventional injection molded shoes have a cylindrical contact surface side protrusion 08 made of an outsole molding material 06 and a midsole molding material 07 of a different color and/or different nature, and a tape-shaped peripheral edge side. Since the protrusion 09 is integrally molded with the midsole 02, a relatively large amount of the unique and/or different midsole molding material 07 used for molding the contact surface side protrusion 08 and the peripheral edge side protrusion 09 is required. . Therefore, the different colored and/or different material parts of the sole 03 may become thicker, increasing the weight of the shoe, or the outsole 01 and midsole 02 may be made of different materials that generally do not have good adhesion. Since the bonding area of the two soles increases, there is a risk that the soles 01 and 02 may easily separate after manufacturing.

The present invention was made against the background of such conventional technology, and it is possible to improve the design of the peripheral side of the shoe and to improve the cleaning efficiency, and also to improve the shaping of the contact surface side protrusion and the peripheral side protrusion. An injection molded shoe and its manufacture that can reduce the amount of different materials used in the process, thereby reducing the weight of shoes having such protrusions, and reducing peeling between the outsole and midsole after manufacturing. The purpose is to provide a method.

[0007]

[Means for Solving the Problems] The present invention provides an injection molded shoe in which a multi-layer sole is integrally molded at the lower part of the shoe cover, in which a protruding hole is provided at the bottom and a notch is provided at the periphery. an outsole, and a ground-contact side that is molded on the covered side of the outsole, is made of a string-like molding material that is different in color and/or different from the outsole molding material, and that protrudes into the protrusion hole. a string-like molded body that integrally connects the protrusion and the peripheral edge side protrusion that is provided without a gap in the notch, and the string-like molded body is laminated on the outsole so as to sandwich the string-like molded body, and the string-like body An injection molded shoe is provided that includes a molding material and a midsole made of a different colored and/or different midsole molding material.

[0008] The present invention also provides a bottom mold in which an annular protrusion for forming a protrusion hole to be provided at the bottom of the outsole protrudes on the design surface of the shoe sole, and a bottom mold that protrudes from the design surface of the shoe sole with an annular protrusion for forming a protrusion hole provided at the bottom of the outsole. After forming an outsole molding gap inside and fitting the first dummy last for outsole molding, which has a solid protrusion for molding the notch projecting therein, the outsole is molded in this outsole molding gap. Fill the material to form an outsole, and then replace the first dummy last with a ground-contact side protrusion that protrudes into the protrusion hole and a peripheral edge-side protrusion that protrudes into the notch without a gap. After the second dummy last for forming the string-like molded body that integrally connects the bottom mold on which the outsole is placed are fitted with a gap formed inside for forming the string-like body, this string is A string-like molding material having a different color and/or different nature from the sole molding material of the outsole is filled into the void for molding the outsole to form a string-like molding material, and then, in place of the second dummy last, this After forming a midsole molding gap inside and fitting the side mold and the main body last with the laces suspended to the bottom mold on which the outsole with a string-like molded body is placed, the midsole molding is performed. The present invention also provides a method for manufacturing an injection molded shoe, characterized in that a midsole is molded by filling the void with a string-shaped body molding material and a different-colored and/or different midsole molding material.

[0009]

[Operation] The injection molded shoe of the present invention includes a bottom mold having an annular protrusion for forming a protrusion hole provided at the bottom of the outsole on the sole design surface, and a bottom mold on the peripheral design surface of the outsole. A first dummy last for outsole molding, which is provided with a solid protrusion for molding a cutout part and protrudingly provided therein, is fitted with an outsole molding gap formed therein. Thereafter, the outsole molding material is filled into the outsole molding gap to mold the outsole.

Next, in place of the first dummy last, a string is provided which integrally connects the ground plane side protrusion protruding into the protrusion hole and the peripheral edge side protrusion protruding into the notch without a gap. The second dummy last for molding the shaped molded body and the bottom mold on which the outsole is placed are fitted together with a gap formed therein for forming the string-like body. After that, the sole molding material of the outsole and the unique color and/or
Alternatively, a string-like molded body is formed by filling a different string-like body molding material.

[0011] Next, instead of the second dummy last, a side mold and a main body last on which the lace cover is suspended are attached to the bottom mold on which the outsole with the string-like molded body is placed, and a mid A sole molding gap is formed and fitted. Thereafter, the shoe is manufactured by filling the midsole molding gap with a midsole molding material different in color and/or different from the string-like body molding material and molding the midsole. As a result, it is possible to improve the design of the peripheral part of the shoe and to improve the cleaning efficiency, and also to reduce the amount of different materials used to form the protrusions on the ground contact side and the protrusions on the peripheral part. It is possible to reduce the weight of shoes having such protrusions, and also to reduce peeling between the outsole and the midsole after manufacturing.

0012

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Injection molded shoes according to embodiments of the present invention are shown in FIGS.
As shown in FIG. 1, it is an injection molded shoe in which a two-layer sole 3 is integrally molded on the lower part 2 of the shoe cover 1, and the heel part 5 of the sole part 4, the vicinity of the non-stepping part 6, the treading part 7 and the toe. A predetermined number of rectangular protrusion holes 9 are provided in each part 8 as shown in FIG.
A pair of rectangular notches 11 are provided on the inner and outer surfaces of the shoe at a certain distance from each other at the upper edges of the heel 5, near the non-stepping part 6, the stepping part 7, and the toe part 8 of the shoe. The outsole 12 is formed independently on the covered side surfaces 12a of the heel portion 5, non-stepping portion vicinity 6, stepping portion 7, and toe portion 8 of the outsole 12, and the outsole molding material is 1
3 and a plurality of rectangular protrusions 16 on the ground surface side, which are made of a string-shaped body molding material 14 different in color and/or different from those shown in FIG. As shown in 8, a tape-shaped rectangular peripheral edge side projection 17 is provided that projects within the notch 11 without a gap.
The string-like molded body 1 shown in FIGS. 1 to 2 and 4 to 7 has a shape similar to that of a crawling earthworm, and is integrally connected with
8, and an outsole molding material 1 that is laminated on the outsole 12 so as to sandwich this string-like molded body 18.
White midsole molding material 19 made of the same material as 3.
It is equipped with a midsole 20 consisting of.

[0013] As the material for the lace cover 1, for example, leathers such as natural leather, synthetic leather, and artificial leather, and general lace cover materials such as vinyl leather can be used. The main raw materials of the molding material 14 and the midsole molding material 19 are all general-purpose shoe sole molding materials, and the outsole 12 and midsole molding material 1
9 and the string-like body molding material 14 is that each of the string-like body molding materials 14 on the side of the heel part 5 and the stepping part 7 is green and has good elasticity with cushioning properties, and Each string-shaped body molding material 14 on the side of the toe portion 8 is purple and has high anti-slip properties with a high grip on the road surface.

Next, a method for manufacturing injection molded shoes according to an embodiment of the present invention will be explained based on the injection molded shoe manufacturing apparatus shown in FIGS. 9 to 13. First, as shown in FIG. An annular protrusion 22 for forming the protrusion hole 9, which has a rectangular shape extending in the inner and outer side directions of the shoe, is provided on the heel part 5, the vicinity of the non-stepping part 6, the stepping part 7, and the toe part 8 of the bottom part 4 of the outsole 12. The bottom mold 23 and the heel portion 5 of the peripheral design surface 24
, a pair of rectangular notches 11 that are long in the front-rear direction of the shoe and are provided in pairs on the inner and outer surfaces of the shoe at a constant interval in the vicinity of the non-stepping part 6, the treading part 7, and the base side edge of the toe part 8. A first dummy last 26 having a protruding solid protrusion 25 for molding is fitted with an outsole molding gap 27 formed therein.

[0015] After that, this outsole molding void 27 is
A white outsole molding material 13 is filled into the bottom mold 23 through a first injection gate 28 formed in the lower part thereof to form the outsole 12 having the above shape. Next, instead of the first dummy last 26, there is also a ground plane side protrusion 16 shown in FIGS. A second molded body for forming a string-like molded body 18 that integrally connects the protrusions 17.
The dummy last 29 and the bottom mold 23 on which the outsole 12 is placed are shaped like earthworms crawling inside each heel part 5, the vicinity of the non-stepping part 6, the stepping part 7 and the toe part 8. Four string-shaped body forming voids 30 each formed individually
form and fit together.

Thereafter, as shown in FIG. 10, each of the string-like molding materials 14 near the unstepped part 6 and on the toe part 7 side is purple and has high road grip and anti-slip properties, and is placed in the lower part of the bottom mold 23. Next, as shown in FIG. 11, a green resin with good cushioning properties is filled into the spaces 30 for forming the string-like body of the heel part 5 and the tread part 7. By injecting the string-like body molding material 14 having the above-mentioned string-like body molding material 14 through the third injection gate 32 formed in the lower part of the bottom mold 23, four independent string-like bodies 18 are molded.

Next, instead of the second dummy last 29, the bottom mold 23 on which the outsole 12 with the four string-like molded bodies 18 is placed is provided with a side mold 33 and a lace as shown in FIGS. Main body last 3 with cover 1 suspended
4 are fitted together with a midsole molding gap 35 formed therein. Thereafter, the midsole molding material 19 is filled into the midsole molding cavity 35 through the fourth injection gate 36 formed between the upper surface of the bottom mold 23 and both lower sides of the side molds 33 to form the midsole. 20
The shoes are manufactured by molding.

In the shoes manufactured in this way, the peripheral edge side protrusion 17 formed on the peripheral edge 10 of the sole 3 projects into the notch 11 without any gap, so that the peripheral edge of the sole 3 It is possible to create a planar expression without grooves in the part 10, which improves the design of the peripheral part 10 of the shoe, and also prevents dust, mud, etc. from entering the grooves as in conventional shoes, making the shoe more comfortable. Cleanability can be improved, and since the string-like molded body 18 is used, the amount of different materials used for molding the contact surface side protrusion 16 and the peripheral edge side protrusion 17 can be reduced. The weight of the shoe having the projections 16 and 17 can be reduced, and the string-like molded body 18 made of different materials is only sandwiched in a narrow range between the outsole 12 and midsole 20 made of the same material. Therefore, peeling between the outsole 12 and the midsole 20 after manufacturing can also be reduced.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and the present invention may be modified even if the structure and operation are changed within the scope of the gist of the present invention. included. For example, the shape of the ground plane side protrusion and the peripheral edge side protrusion is not limited to a rectangular shape as in the embodiment, but may be any shape such as a cylindrical shape. Further, in the embodiment, the outsole, the string-like molded body, and the midsole are constructed, but the invention is not necessarily limited to this, and for example, a predetermined layer of top sole may be provided on the midsole.

Further, the locations where the ground plane side protrusions and the peripheral edge side protrusions are formed need not be limited to the four locations as in the embodiment, but may be formed at any location, and any number thereof may be formed. Furthermore, any set of the contact surface side projections and the peripheral edge side projections may be made of a string-like body molding material that is different in color and/or different from the outsole molding material.

[0021]

Effects of the Invention In the injection molded shoes and the manufacturing method thereof of the present invention, since the peripheral edge side protrusions molded on the peripheral edge of the sole protrude into the notch without any gaps, This improves the design of the periphery of the shoe by creating a flat surface with no grooves, and it also improves the cleaning properties of the shoe because dust and mud do not get into the grooves unlike in conventional shoes. This has the effect of improving the

Furthermore, since a string-like molded body is used, it is possible to reduce the amount of different materials used for forming the contact surface side protrusion and the peripheral edge side protrusion, which makes it possible to reduce the amount of different materials used for forming the contact surface side protrusion and the peripheral edge side protrusion. In addition to reducing weight, the string-like molded body made of different materials is only sandwiched in a narrow area between the outsole and midsole, which are made of the same material.
The effect of reducing peeling between the outsole and the midsole after manufacturing can also be obtained.

[0023]

[Brief explanation of the drawing]

FIG. 1 is a side view of an injection molded shoe according to an embodiment of the present invention.

FIG. 2 is a central vertical sectional view of an injection molded shoe according to an embodiment of the present invention.

FIG. 3 is a bottom view of an injection molded shoe according to an embodiment of the present invention.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 1;

FIG. 5 is a sectional view taken along the line V-V in FIG. 1;

FIG. 6 is a sectional view taken along VI-VI in FIG. 1;

FIG. 7 is a sectional view taken along VII-VII in FIG. 1;

FIG. 8 is an enlarged cross-sectional view of the main part of the sole of the injection molded shoe according to the embodiment of the present invention.

FIG. 9 is a longitudinal cross-sectional view showing the outsole molding process of the injection molded shoe manufacturing method according to the embodiment of the present invention.

FIG. 10 is a longitudinal cross-sectional view showing one step of forming a string-like molded body in the method for manufacturing injection-molded shoes according to an embodiment of the present invention.

FIG. 11 is a longitudinal cross-sectional view showing another step of forming a string-like molded body in the method for manufacturing injection-molded shoes according to an embodiment of the present invention.

FIG. 12 is a longitudinal cross-sectional view showing the midsole molding process of the injection molded shoe manufacturing method according to the embodiment of the present invention.

FIG. 13 is a cross-sectional view showing the midsole molding process of the injection molded shoe manufacturing method according to the embodiment of the present invention.

FIG. 14 is a sectional view of a conventional injection molded shoe.

FIG. 15 is a sectional view showing an outsole molding process in a conventional injection molded shoe manufacturing method.

FIG. 16 is a sectional view showing a midsole molding process in a conventional injection molded shoe manufacturing method.

[0024]

[Explanation of symbols]

1. 2 Lower part 3 Sole of shoe 4 Bottom 9 Protrusion hole 10 Peripheral area 11 Notch 12 Outsole 12a　Face cover side 13 Outsole molding material 14 String-like body molding material 16　Protrusion on the ground surface side 17 Peripheral side projection 18 String-like molded body 19 Midsole molding material 20 Midsole 21 Sole design surface 22 Annular projection 23 Bottom mold 24 Peripheral side design surface 25 Solid protrusion 26 1st dummy last 27 Outsole molding void 30　Void for forming string-like body 33 Side mold 34 Main body last 35 Midsole molding void

Claims (2)

[Claims] Claim 1: An injection molded shoe in which a multi-layered sole is integrally molded on the lower part of the shoe cover, an outsole having a protruding hole in the bottom and a notch in the periphery; Molded on the covered side surface and made of a string-like molding material different in color and/or different from the outsole molding material, there is no gap between the contact surface side protrusion protruding into the protrusion hole and the notch. A string-like molded body that integrally connects the protruding peripheral edge side projections, and a string-like molded body that is laminated on the outsole so as to sandwich the string-like molded body,
and an injection molded shoe comprising the above-mentioned string-like body molding material and a midsole made of a different color and/or different type of midsole molding material. [Claim 2] First, a bottom mold having an annular protrusion for forming a protrusion hole provided at the bottom of the outsole protrudes on the sole design surface, and a notch provided on the peripheral edge of the outsole on the peripheral design surface. A first dummy last for outsole molding having a protruding solid protrusion for molding is fitted with an outsole molding cavity formed therein, and then an outsole molding material is filled into this outsole molding cavity. Then mold the outsole, and then replace it with the first dummy last.
a second dummy last for molding a string-like molded body that integrally connects the ground-contact side protrusion that protrudes into the protrusion hole and the peripheral edge side protrusion that protrudes into the notch without a gap; and an outsole. After forming a space for forming a string-like body inside the bottom mold and fitting the bottom mold, the sole molding material of the outsole and a different color and/or different string are inserted into this space for forming a string-like body. A string-like molded body is formed by filling the material for forming the string-like body, and then, instead of the second dummy last, a side mold and a sleeve are placed on the bottom mold on which the outsole with the string-like molded body is placed. After the suspended main body last is fitted with a midsole molding cavity formed inside, the midsole molding cavity is filled with a string-like body molding material and a different colored and/or different midsole molding material. A method for manufacturing injection molded shoes, characterized in that the midsole is molded using a method of manufacturing injection molded shoes.