WO2005090062A1 - Sole using multiple injection molding and its manufacturing method - Google Patents

Sole using multiple injection molding and its manufacturing method Download PDF

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Publication number
WO2005090062A1
WO2005090062A1 PCT/KR2005/000781 KR2005000781W WO2005090062A1 WO 2005090062 A1 WO2005090062 A1 WO 2005090062A1 KR 2005000781 W KR2005000781 W KR 2005000781W WO 2005090062 A1 WO2005090062 A1 WO 2005090062A1
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WO
WIPO (PCT)
Prior art keywords
injection molding
outsole
sole
frame
mold
Prior art date
Application number
PCT/KR2005/000781
Other languages
French (fr)
Inventor
Jum Sik Jung
Sang Ho Lee
Sang Jae Lee
Sung Wook Bae
Dong Seok Jang
Original Assignee
Wooyun Co., Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wooyun Co., Ltd filed Critical Wooyun Co., Ltd
Publication of WO2005090062A1 publication Critical patent/WO2005090062A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K61/00—Culture of aquatic animals
    • A01K61/50—Culture of aquatic animals of shellfish
    • A01K61/51—Culture of aquatic animals of shellfish of gastropods, e.g. abalones or turban snails
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1671—Making multilayered or multicoloured articles with an insert
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1676—Making multilayered or multicoloured articles using a soft material and a rigid material, e.g. making articles with a sealing part
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D35/00—Producing footwear
    • B29D35/12—Producing parts thereof, e.g. soles, heels, uppers, by a moulding technique
    • B29D35/14—Multilayered parts
    • B29D35/142—Soles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1676—Making multilayered or multicoloured articles using a soft material and a rigid material, e.g. making articles with a sealing part
    • B29C2045/1678—Making multilayered or multicoloured articles using a soft material and a rigid material, e.g. making articles with a sealing part first moulding the soft material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/14—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles in several steps
    • B29C43/146—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles in several steps for making multilayered articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2221/00—Use of unspecified rubbers as reinforcement
    • B29K2221/003—Thermoplastic elastomers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/48—Wearing apparel
    • B29L2031/50—Footwear, e.g. shoes or parts thereof
    • B29L2031/504—Soles

Definitions

  • the present invention relates, in general, to a method of manufacturing a sole and, more particularly, to a sole of a shoe, such as cycle shoes, manufactured through a multiple injection molding process using a mold, and a method of manufacturing the sole.
  • a portion of a sole which is easily worn out or a specified portion of the sole is made of a material having hardness different from other portions of the sole, because the sole does not uniformly wear and so that a wearer may feel comfortable.
  • the manufacturing method includes the step of preparing a main foam material containing a resin material and a foaming agent, the step of forming a subsidiary material insert containing a resin material which is cross-linkable with the main foam material, and having different physical properties from the main foam material, and the step of making a subsidiary cavity area in a cavity of a mold for foam molding. Further, the method includes the step of inserting the solid subsidiary material insert into the subsidiary cavity area, the step of filling the liquid main foam material in the cavity, and the step of opening the mold and foaming, after a predetermined curing time has passed at a predetermined reaction temperature.
  • the main foam material and the subsidiary foam material contain the identical resin material, and only materials which are cross- linkable with each other are used. Thus, two areas of the product are different only in color and foam density. Thereby, the prior art is problematic in that abrasion resistance is worse than rubber or the like. Disclosure of Invention Technical Problem
  • an object of the present invention is to provide a sole manufactured through a multiple injection molding process using multiple materials, and a method of manufacturing the sole.
  • Another object of the present invention is to provide a sole manufactured through a multiple injection molding process which forms a specific portion of the sole using a specific material, thus allowing the design of the sole to be variously changed, therefore being adapted to functional shoes, and a method of manufacturing the sole.
  • the present invention provides a method of manufacturing a sole through multiple injection molding, including a rubber input step to input rubber into a rubber holding space provided on an upper surface of a lower mold, with an adhesive applied to an upper surface of the rubber; a first injection molding step to combine a first upper mold with the upper surface of the lower mold, and inject a liquid TPU resin into a first injection molding space defined between the rubber and the first upper mold, thus executing injection molding; a mold moving step to remove the first upper mold and move the lower mold to a predetermined position; and a second injection molding step to combine a second upper mold with the upper surface of the repositioned lower mold, and inject a liquid nylon resin into a second injection molding space defined between the second upper mold and the lower mold, thus executing injection molding.
  • the present invention provides a sole manufactured through multiple injection molding, including a frame providing a fundamental structure of the sole, and manufactured through injection molding using a liquid nylon resin, with a through hole formed in a central portion of the frame; an outsole provided on a underside of the frame, and manufactured through injection molding using a liquid TPU resin, the outsole supporting the frame; and a ground contact portion provided on a underside of the outsole, and made by cutting rubber to a predetermined size, the ground contact portion adhered to the underside of the outsole when the outsole is manufactured through extrusion molding.
  • the TPU resin is heated and melted at a temperature from 180°C to 200°C
  • the nylon resin is heated and melted at a temperature from 220°C to 280°C.
  • the outsole includes a front outsole portion provided on a front of the frame, a side outsole portion provided on a side of the frame, and a rear outsole portion provided on a rear of the frame.
  • a sole is formed through a multiple injection molding process using different materials, thus being suitable for special shoes requiring special properties.
  • FIG. 1 is a sectional view to show a process of manufacturing a sole using molds, according to the present invention
  • Fig. 2 is a sectional view to show an important part of the sole manufactured using the molds
  • Fig. 3 is a perspective view of the sole
  • FIG. 4 is a bottom perspective view of the sole.
  • FIG.l is a sectional view to show a process of manufacturing a sole using molds, according to the present invention
  • Fig. 2 is a sectional view to show an important part of the sole manufactured using the molds
  • Fig. 3 is a perspective view of the sole
  • Fig. 4 is a bottom perspective view of the sole.
  • the method of manufacturing the sole through multiple injection molding includes a rubber input step, a first injection molding step, and a second injection molding step.
  • the rubber input step will be described below.
  • a user cuts a rubber plate to a predetermined size.
  • the rubber plate is cut to have a size corresponding to a cavity formed on an upper portion of a lower mold 100, that is, a rubber holding space 101.
  • the cut rubber plate provides ground contact portions 220 of the sole.
  • the cut rubber plate is input into the rubber holding space 101, with an adhesive applied to the upper surface of the cut rubber plate.
  • a first upper mold 110 is combined with the lower mold 100, so that the first injection molding step is carried out.
  • thermo plastic urethane (TPU) solution which melts at a temperature from 180°C to 220°C, is fed through gates into the first injection molding space 111 under pressure of 100D/H
  • TPU thermo plastic urethane
  • the TPU which is the initial material is dried and then input into a hopper. Afterwards, the TPU is melted at the temperature from 180°C to 220°C. The molten TPU is fed through the gates into the first injection molding space 111. The molten TPU is cured for about 3 minutes, so that the outsole 210 is completed.
  • the outsole 210 is provided on the underside of a frame 200 that will be described later.
  • the outsole 210 includes a front outsole portion 211, side outsole portions 212, and rear outsole portions 213, which will be described below in detail.
  • a mold moving step is carried out. That is, the lower mold 100 moves downwards to be separated from the first upper mold 110.
  • the separated lower mold 100 is automatically moved laterally. Afterwards, the lower mold 100 moves upwards to be combined with a second upper mold 120. In such a state, the second injection molding step is carried out.
  • a cavity that is, a second injection molding space 121, is defined between the second upper mold 120 and the lower mold 100.
  • the second injection molding space 121 is a space to form the frame 200 of a shoe.
  • a nylon solution which is melted at a temperature from 200°C to 280°C, is fed through gates into the second injection molding space 121. Thereby, the frame 200 is formed.
  • nylon which is the initial material is dried and then input into a hopper. Afterwards, the nylon is melted at a temperature from 200°C to 280°C. The molten nylon is fed through the gates into the second injection molding space 121 under pressure of about 50D/D. When the molten nylon has cured for a predetermined time, the frame 200 is formed.
  • the sole manufactured through the above-mentioned process includes the frame 200, the outsole 210, and the ground contact portions 220.
  • the frame 200 defines the fundamental structure of the sole, and is formed through injection molding using a nylon resin. A central portion of the frame 200 is downwardly depressed, with a through hole 201 formed in the central portion.
  • the outsole 210 functions to support the frame 200. As described above, the outsole 210 is formed through injection molding using the TPU resin, and is provided on the underside of the frame 200.
  • the outsole 210 includes the front outsole portion 211, the side outsole portions 212, and the rear outsole portions 213.
  • the front outsole portion 211 projects upwards from a front area of the underside of the frame 200.
  • the side outsole portions 212 are provided on both sides on the underside of the frame 200 to be spaced apart from each other.
  • Each of the side outsole portions 212 includes a first side part 212a and a second side part 212b.
  • the first side parts 212a are provided on both sides on the underside of the frame 200 to upwardly project to a predetermined position.
  • the second side part 212b is provided behind each first side part 212a and is spaced apart from the first side part 212a by a predetermined interval.
  • the second side parts 212b are provided on both sides on the underside of the frame 200, so that the second side parts 212b are formed only on the underside of the frame 200.
  • the rear outsole portions 213 are provided on both sides of the rear area of the underside of the frame 200. Further, each rear outsole portion 213 protrudes upwards from a side of the frame 200 to a predetermined position. Thereby, the rear outsole portions 213 support the frame 200 and a wearer's foot, when a user wears the shoes.
  • the ground contact portions 220 are made of a rubber material, and are provided on the underside of the outsole 210. When the outsole 210 is formed through injection molding, the ground contact portions 220 adhere to the underside of the outsole 210. The ground contact portions 220 are provided throughout the underside of the outsole 210, excluding the front outsole portion 211. Further, the ground contact portions 220 might not be provided on the second side parts 212b of the outsole 210, as necessary, without departing from the scope and spirit of the invention.
  • the sole of this invention can be used for special shoes, including cycle shoes.
  • a sole is manufactured through a multiple injection molding process using different materials, and a specific portion of the sole is manufactured through injection molding using a specific material.
  • this invention allows the design of the sole to be variously changed, thus being adapted to shoes having various functions.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Environmental Sciences (AREA)
  • Marine Sciences & Fisheries (AREA)
  • Zoology (AREA)
  • Animal Husbandry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

Disclosed herein are a multiple injection molded sole and a manufacturing method thereof. The method includes a rubber input step to input rubber into a rubber holding space (101) provided on an upper surface of a lower mold (100), with an adhesive applied to an upper surface of the rubber, a first injection molding step to combine a first upper mold (110) with the upper surface of the lower mold, and inject a liquid TPU resin into a first injection molding space (111), a mold moving step to remove the first upper mold and move the lower mold to a predetermined position, and a second injection molding step to combine a second upper mold (120) with the upper surface of the repositioned lower mold, and inject a liquid nylon resin into a second injection molding space (121) defined between the second upper mold and the lower mold.

Description

Description SOLE USING MULTIPLE INJECTION MOLDING AND ITS MANUFACTURING METHOD Technical Field
[1] The present invention relates, in general, to a method of manufacturing a sole and, more particularly, to a sole of a shoe, such as cycle shoes, manufactured through a multiple injection molding process using a mold, and a method of manufacturing the sole. Background Art
[2] Generally, a portion of a sole which is easily worn out or a specified portion of the sole is made of a material having hardness different from other portions of the sole, because the sole does not uniformly wear and so that a wearer may feel comfortable.
[3] For example, Korean Patent No. 10-256180 has been proposed, which is titled injection foaming product and manufacturing method thereof. According to the prior art, the manufacturing method includes the step of preparing a main foam material containing a resin material and a foaming agent, the step of forming a subsidiary material insert containing a resin material which is cross-linkable with the main foam material, and having different physical properties from the main foam material, and the step of making a subsidiary cavity area in a cavity of a mold for foam molding. Further, the method includes the step of inserting the solid subsidiary material insert into the subsidiary cavity area, the step of filling the liquid main foam material in the cavity, and the step of opening the mold and foaming, after a predetermined curing time has passed at a predetermined reaction temperature.
[4] Through such a process, injection foaming products having areas made from different materials are obtained.
[5] However, according to the prior art, the main foam material and the subsidiary foam material contain the identical resin material, and only materials which are cross- linkable with each other are used. Thus, two areas of the product are different only in color and foam density. Thereby, the prior art is problematic in that abrasion resistance is worse than rubber or the like. Disclosure of Invention Technical Problem
[6] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a sole manufactured through a multiple injection molding process using multiple materials, and a method of manufacturing the sole. [7] Another object of the present invention is to provide a sole manufactured through a multiple injection molding process which forms a specific portion of the sole using a specific material, thus allowing the design of the sole to be variously changed, therefore being adapted to functional shoes, and a method of manufacturing the sole. Technical Solution
[8] In order to accomplish the above objects, the present invention provides a method of manufacturing a sole through multiple injection molding, including a rubber input step to input rubber into a rubber holding space provided on an upper surface of a lower mold, with an adhesive applied to an upper surface of the rubber; a first injection molding step to combine a first upper mold with the upper surface of the lower mold, and inject a liquid TPU resin into a first injection molding space defined between the rubber and the first upper mold, thus executing injection molding; a mold moving step to remove the first upper mold and move the lower mold to a predetermined position; and a second injection molding step to combine a second upper mold with the upper surface of the repositioned lower mold, and inject a liquid nylon resin into a second injection molding space defined between the second upper mold and the lower mold, thus executing injection molding.
[9] Further, the present invention provides a sole manufactured through multiple injection molding, including a frame providing a fundamental structure of the sole, and manufactured through injection molding using a liquid nylon resin, with a through hole formed in a central portion of the frame; an outsole provided on a underside of the frame, and manufactured through injection molding using a liquid TPU resin, the outsole supporting the frame; and a ground contact portion provided on a underside of the outsole, and made by cutting rubber to a predetermined size, the ground contact portion adhered to the underside of the outsole when the outsole is manufactured through extrusion molding.
[10] In this case, the TPU resin is heated and melted at a temperature from 180°C to 200°C, and the nylon resin is heated and melted at a temperature from 220°C to 280°C.
[11] Preferably, the outsole includes a front outsole portion provided on a front of the frame, a side outsole portion provided on a side of the frame, and a rear outsole portion provided on a rear of the frame. Advantageous Effects
[12] According to the present invention, a sole is formed through a multiple injection molding process using different materials, thus being suitable for special shoes requiring special properties.
[13] Further, a specific portion of the sole is manufactured through injection molding using a specific material, thus allowing the design of the sole to be variously changed, and allowing the sole to be used for general shoes having a special function. Brief Description of the Drawings
[14] Fig. 1 is a sectional view to show a process of manufacturing a sole using molds, according to the present invention; [15] Fig. 2 is a sectional view to show an important part of the sole manufactured using the molds; [16] Fig. 3 is a perspective view of the sole; and
[17] Fig. 4 is a bottom perspective view of the sole.
[ 18] <Description of reference characters of important parts>
[19] 100 : lower mold 101: rubber holding space
[20] 110: first upper mold
[21] 111: first inj ection molding space
[22] 120: second upper mold
[23] 121 : second injection molding space
[24] 200: frame 201 : through hole
[25] 210: outsole 211: front outsole portion
[26] 212: side outsole portions
[27] 212a: first side parts 212b: second side parts
[28] 213: rear outsole portions 220: ground contact portions Best Mode for Carrying Out the Invention [29] A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings. [30] Fig.l is a sectional view to show a process of manufacturing a sole using molds, according to the present invention, Fig. 2 is a sectional view to show an important part of the sole manufactured using the molds, Fig. 3 is a perspective view of the sole, and Fig. 4 is a bottom perspective view of the sole. [31] As shown in the drawings, the method of manufacturing the sole through multiple injection molding, according to this invention, includes a rubber input step, a first injection molding step, and a second injection molding step. [32] First, the rubber input step will be described below.
[33] A user cuts a rubber plate to a predetermined size. In this case, the rubber plate is cut to have a size corresponding to a cavity formed on an upper portion of a lower mold 100, that is, a rubber holding space 101. The cut rubber plate provides ground contact portions 220 of the sole. [34] The cut rubber plate is input into the rubber holding space 101, with an adhesive applied to the upper surface of the cut rubber plate. [35] Subsequently, a first upper mold 110 is combined with the lower mold 100, so that the first injection molding step is carried out.
[36] When the first injection molding step is executed, rubber is held in the rubber holding space 101 of the lower mold 100. In such a state, the lower mold 100 moves upwards so that the first upper mold 110 is combined with the upper portion of the lower mold 100. Thereby, a cavity, that is, a first injection molding space 111 is defined between the lower mold 100 and the first upper mold 110.
[37] Further, a thermo plastic urethane (TPU) solution, which melts at a temperature from 180°C to 220°C, is fed through gates into the first injection molding space 111 under pressure of 100D/H Thus, an outsole 210 which is divided into several portions is formed.
[38] In this case, the TPU which is the initial material is dried and then input into a hopper. Afterwards, the TPU is melted at the temperature from 180°C to 220°C. The molten TPU is fed through the gates into the first injection molding space 111. The molten TPU is cured for about 3 minutes, so that the outsole 210 is completed.
[39] In this case, the outsole 210 is provided on the underside of a frame 200 that will be described later. The outsole 210 includes a front outsole portion 211, side outsole portions 212, and rear outsole portions 213, which will be described below in detail.
[40] Next, a mold moving step is carried out. That is, the lower mold 100 moves downwards to be separated from the first upper mold 110.
[41] The separated lower mold 100 is automatically moved laterally. Afterwards, the lower mold 100 moves upwards to be combined with a second upper mold 120. In such a state, the second injection molding step is carried out.
[42] When the first upper mold 120 has been combined with the lower mold 100, a cavity, that is, a second injection molding space 121, is defined between the second upper mold 120 and the lower mold 100.
[43] The second injection molding space 121 is a space to form the frame 200 of a shoe. A nylon solution, which is melted at a temperature from 200°C to 280°C, is fed through gates into the second injection molding space 121. Thereby, the frame 200 is formed.
[44] In a detailed description, nylon which is the initial material is dried and then input into a hopper. Afterwards, the nylon is melted at a temperature from 200°C to 280°C. The molten nylon is fed through the gates into the second injection molding space 121 under pressure of about 50D/D. When the molten nylon has cured for a predetermined time, the frame 200 is formed.
[45] After such a process has been completed, the lower mold 100 is separated from the second upper mold 120, so that the sole is completed.
[46] The sole manufactured through the above-mentioned process includes the frame 200, the outsole 210, and the ground contact portions 220.
[47] The frame 200 defines the fundamental structure of the sole, and is formed through injection molding using a nylon resin. A central portion of the frame 200 is downwardly depressed, with a through hole 201 formed in the central portion.
[48] Further, the outsole 210 functions to support the frame 200. As described above, the outsole 210 is formed through injection molding using the TPU resin, and is provided on the underside of the frame 200. The outsole 210 includes the front outsole portion 211, the side outsole portions 212, and the rear outsole portions 213.
[49] The front outsole portion 211 projects upwards from a front area of the underside of the frame 200.
[50] The side outsole portions 212 are provided on both sides on the underside of the frame 200 to be spaced apart from each other. Each of the side outsole portions 212 includes a first side part 212a and a second side part 212b.
[51] The first side parts 212a are provided on both sides on the underside of the frame 200 to upwardly project to a predetermined position. The second side part 212b is provided behind each first side part 212a and is spaced apart from the first side part 212a by a predetermined interval. The second side parts 212b are provided on both sides on the underside of the frame 200, so that the second side parts 212b are formed only on the underside of the frame 200.
[52] The rear outsole portions 213 are provided on both sides of the rear area of the underside of the frame 200. Further, each rear outsole portion 213 protrudes upwards from a side of the frame 200 to a predetermined position. Thereby, the rear outsole portions 213 support the frame 200 and a wearer's foot, when a user wears the shoes.
[53] The ground contact portions 220 are made of a rubber material, and are provided on the underside of the outsole 210. When the outsole 210 is formed through injection molding, the ground contact portions 220 adhere to the underside of the outsole 210. The ground contact portions 220 are provided throughout the underside of the outsole 210, excluding the front outsole portion 211. Further, the ground contact portions 220 might not be provided on the second side parts 212b of the outsole 210, as necessary, without departing from the scope and spirit of the invention.
[54] Therefore, the sole of this invention can be used for special shoes, including cycle shoes. Industrial Applicability
[55] According to the present invention, a sole is manufactured through a multiple injection molding process using different materials, and a specific portion of the sole is manufactured through injection molding using a specific material. Thus, this invention allows the design of the sole to be variously changed, thus being adapted to shoes having various functions.

Claims

Claims
[1] A method of manufacturing a sole through multiple injection molding, comprising: a rubber input step to input rubber into a rubber holding space provided on an upper surface of a lower mold, with an adhesive applied to an upper surface of the rubber; a first injection molding step to combine a first upper mold with the upper surface of the lower mold, and inject a liquid TPU resin into a first injection molding space defined between the rubber and the first upper mold, thus executing injection molding; a mold moving step to remove the first upper mold and move the lower mold to a predetermined position; and a second injection molding step to combine a second upper mold with the upper surface of the repositioned lower mold, and inject a liquid nylon resin into a second injection molding space defined between the second upper mold and the lower mold, thus executing injection molding.
[2] The method according to claim 1, wherein the TPU resin is heated and melted at a temperature from 180°C to 200°C, and the nylon resin is heated and melted at a temperature from 220°C to 280°C.
[3] A sole manufactured through multiple injection molding, comprising: a frame providing a fundamental structure of the sole, and manufactured through injection molding using a liquid nylon resin, with a through hole formed in a central portion of the frame; an outsole provided on a underside of the frame, and manufactured through injection molding using a liquid TPU resin, the outsole supporting the frame; and a ground contact portion provided on a underside of the outsole, and made by cutting rubber to a predetermined size, the ground contact portion adhered to the underside of the outsole when the outsole is manufactured through extrusion molding.
[4] The sole according to claim 3, wherein the outsole comprises: a front outsole portion provided on a front of the frame; a side outsole portion provided on a side of the frame; and a rear outsole portion provided on a rear of the frame.
PCT/KR2005/000781 2004-03-23 2005-03-18 Sole using multiple injection molding and its manufacturing method WO2005090062A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020040019770A KR100593415B1 (en) 2004-03-23 2004-03-23 Shoe sole formed from multiple injections and its manufacturing method
KR10-2004-0019770 2004-03-23

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WO2005090062A1 true WO2005090062A1 (en) 2005-09-29

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CN101626704B (en) * 2007-02-09 2012-07-04 耐克国际有限公司 Laminate and method for making laminate
US9321199B2 (en) 2007-02-09 2016-04-26 Nike, Inc. Method for making laminate
WO2008100444A2 (en) * 2007-02-09 2008-08-21 Nike, Inc. Laminate and method for making laminate
US9986785B2 (en) 2007-02-09 2018-06-05 Nike, Inc. Laminate and method for making laminate
US9924762B2 (en) 2007-02-09 2018-03-27 Nike, Inc. Laminate and method for making laminate
WO2008100444A3 (en) * 2007-02-09 2009-08-13 Nike Inc Laminate and method for making laminate
US9321200B2 (en) 2007-02-09 2016-04-26 Nike, Inc. Method for making laminate
US8524131B2 (en) 2007-02-09 2013-09-03 Nike, Inc. Laminate and method for making laminate
US7810252B2 (en) 2007-02-09 2010-10-12 Nike, Inc. Laminate and method for making laminate
EP2103420A3 (en) * 2008-03-19 2009-11-18 Vertex L.L.C. Molding process and apparatus
EP2495097A1 (en) * 2008-03-19 2012-09-05 Vertex L.L.C. Molding process and apparatus
EP2312963A4 (en) * 2008-08-12 2013-08-28 Myung Kye Jang A shoe and midsole manufacturing method having 2-state insert structure
EP2312963A2 (en) * 2008-08-12 2011-04-27 Myung Kye Jang A shoe and midsole manufacturing method having 2-state insert structure
ITMC20090076A1 (en) * 2009-04-08 2010-10-09 Gruppo Meccaniche Luciani Srl MOLD FOR THE PRODUCTION OF SOLES FOR FOOTWEAR
WO2011161272A1 (en) * 2010-06-21 2011-12-29 Desarrollo Integral Del Molde, S.L. Process for producing soles having a decorative strip and soles thus produced
DE102010034858A1 (en) * 2010-08-18 2012-02-23 Werkzeugbau Siegfried Hofmann Gmbh Multi-component injection molding method for manufacturing light cords from e.g. polyurethane, involves injecting solidifiable material into cavity for forming component, curing material in cavity, and removing component from molding tool
CN108099240A (en) * 2017-12-15 2018-06-01 清远市广硕鞋业有限公司 The method of TPU high/low temperature film preparation footwear outsoles

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