CA2233054A1 - Injection-foamed product and manufacturing method thereof - Google Patents
Injection-foamed product and manufacturing method thereof Download PDFInfo
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- CA2233054A1 CA2233054A1 CA002233054A CA2233054A CA2233054A1 CA 2233054 A1 CA2233054 A1 CA 2233054A1 CA 002233054 A CA002233054 A CA 002233054A CA 2233054 A CA2233054 A CA 2233054A CA 2233054 A1 CA2233054 A1 CA 2233054A1
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- Prior art keywords
- auxiliary
- cavity
- injection
- main
- main material
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Classifications
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/12—Moulds or cores; Details thereof or accessories therefor with incorporated means for positioning inserts, e.g. labels
- B29C33/14—Moulds or cores; Details thereof or accessories therefor with incorporated means for positioning inserts, e.g. labels against the mould wall
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
- B29C44/1228—Joining preformed parts by the expanding material
- B29C44/1233—Joining preformed parts by the expanding material the preformed parts being supported during expanding
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C08L23/0853—Vinylacetate
-
- 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
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/08—Copolymers of ethylene
- B29K2023/083—EVA, i.e. ethylene vinyl acetate copolymer
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Molding Of Porous Articles (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Peptides Or Proteins (AREA)
Abstract
An injection-foamed product having a different material portion and a manufacturing method thereof. The method comprises steps of preparing a main material mixture, preforming an auxiliary material piece having a property different from a property of the main material mixture, forming an auxiliary cavity region in a cavity of a mold for injection-foaming, placing the auxiliary material piece in the auxiliary cavity region, filling up the mainmaterial mixture in the cavity, maintaining the main material mixture and the auxiliary material piece in the cavity under a predetermined temperature and pressure for a predetermined time, and opening the mold to obtain the injection-foamed product. Accordingly, injection-foamed products having various properties such as color, density and hardness can be easily and efficiently obtained.
Description
CA 022330~4 1998-03-24 INJECIION-FOAMED PRODUCT AND MANUFACI~URING l\lETHOD THE~EOF
BACKGROUND OF THE INVENTION
The present invention relates to an injection-foamed product having a different material portion and a manufacturing method thereof An injection-foaming method comprises steps of filling up a mixture of resin such as ethylene vinylacetate copolymer (EVA) and a foamin g agent in a cavity having a desired shape which is formed in a mold, maintainin, the mixture in the cavity at about 170-190~ C for about 6-10 minutes and then opening the mold to obtain an inJection-foamed product which is expanded by 30% or more compared with the size of the cavity by the expansion of foaming gas from the foaming agent. The injection-foaming method, which has been developed recently, is not yet prevailing. Howe\,-er, since the injection-foaming, method can promptly and easily provide a foamed product having various shapes and properties, the application thereof is expected to be widely extended.
The injection-foamed product is actively employed as parts for shoes, particularly sports shoes, such as a mid-sole and an out-sole. Recently, an integral sole for shoes has been developed in the shape of the injection-foamed product.
ln conventional sports shoes, an out-sole of rubber is attached onto the lower surface of a mid-sole of a foaming material such as polyurethane, as disclosed in U. S. Patent No. 4,245,406. However, the above-described injection-foaming method can form the mid-sole and the out-sole into one integral piece, thereby to reduce the weight of the product and increase the productivity, resulting in decreasing a manul'acturin~ cost.
However, in the injection-foaming method, since the material is supplied into a cavity of a mold in a fluid state and undergoes a cross-linking reaction for a predetermined time to obtain the injection-foamed product, the fluid material has inevitably homogeneous. Therefore, the product is generally monotonous in properties such as color, density and hardness thereof. Further, the injection-foamed substance is typically inferior to a injection-molded substance or rubber in anti-abrasiveness. In these respects, it will be preferable if the injection-foaming method can provide an injection-foamed product having at least a different material portion to obtain different colors, densities or hardnesses.
SUMMARY OF THE IN~,TENTION
It is an object of the present invention to provide an injection-foamed product having a different material portion and a manufacturing method thereof.
To accomplish the above object, there is provided a method for manufacturing an injection-foamed product having a different material portion, comprising the steps of: preparing a main material mixture containing a main resin and a foaming agent; preforming an auxiliary material piece containing an auxiliary resin which can cross-link with the main resin and having a property different from a property of the main material mixture;
forming an auxiliary cavity region in a cavity of a mold for injection-foaming; placinl the auxiliary material piece in the auxiliary cavity region; filling up the main material mixture in a fluid state in the cavity;
maintaining the main material mixture and the auxiliary material piece in the cavity under a predetermined temperature and pressure for a predetermined CA 022330~4 1998-03-24 time, and opening the mold to obtain the injection-foamed product.
It is preferable that the main material mixture and the auxiliary material piece have the same resin and are different from each other in at least one of color, density and hardness. The same resin may preferably be EVA.
Here, the auxiliary material piece may further contain the foaming agent and is preformed at a temperature lovver than a foaming temperature of the foaming agent.
To accomplish the above object, there is also provided an injection-foamed product having a different material portion manufactured according to the following method: preparing a main material mixture containing a main resin and a foaming agent; preforming an auxiliary material piece containin~ an auxiliary resin which can cross-link with the main resin and having a property different from a property of the main material mixture; .forming an auxiliary cavity re~ion in a cavity of a mold for injection-foaming; placing the auxiliary material piece in the auxiliary cavity region; filling up the main material mixture in a fluid state in the cavity; maintaining the main material mixture and the auxiliary material piece in the cavity under a predetermined temperature and pressure for a predetermined time; and opening the mold to obtain the injection-formed product.
BRIEF DESCRIPTION OF THE DRAWINGS
The above object and advantage of the present invention will become apparent by describing in detail a preferred embodiment thereof vvith reference to the accompanying drawiny,s in which:
Fig. 1 shows a perspective view of a sole for shoes as one application of an injection-foamed product according to the present invention, Fig. 2 shows a sectional view taken along a line II-II in Fig. l;
Fig. 3 shows a sectional view of a mold for explaining an injection-foamed product manufacturing method according to the present invention;
Fi~,. 4 shows a plan view of a lower die in Fig. 3; and Figs. 5 to 7 show sectional views of the mold in Fig. 3, for sequetltially explaining the method accordin~, to the present invention.
DETAILED DESCRIPTlON OF THE INVENTION
Referring to Figs. I and 2, a sole 1, for example, for sports shoes as one application of an injection-foamed product having different material portions according to the present invention has an integral shape in contrast to the conventional sports shoes in which a mid-sole and an out-sole are separately formed.
The sole I includes a main material portion 2 occupying most of the sole I and f rst and second auxiliary material portions 3 and 4 occupying a part of the lower surface of the sole 1. The main material portion 2 and the first and second auxiliary material portions 3 and 4 contain resin materials which can cross-link with each other under a predetermined condition. It is preferable that the resin materials are identical with each other. Preferably, one of polyurethane, polystyrene, EVA, PVC and TPR (thermoplastic rubber), particularly EVA may be used for the resin materials.
The main material portion 2 and the first and second auxi]iary material portions 3 and 4 may have different densities, hardnesses, elasticities CA 022330~4 1998-03-24 or colors by adjusting contents and kinds of foaming agents or additives contained in the main and auxiliary materials. For example, an auxiliary material portion having higher anti-abrasiveness, density or hardness than the main material portion can be applied to a heel region of a sole. Auxiliary material portions having different colors allow a injection-foamed product to be designed with two-tone or multi-tone color.
Fi~g. 3 shows a sectional view of a mold 10 for forming the sole ]
having the auxiliary material portions 3 and 4 and Fig. 4 is a plan view of a lower die in Fig. 3. Here, the shape of a cavity 13 formed in the mo]d 10 is simplil'ied as compared with the sole I shown in Fig. 1, for convenience of description.
The mold 10 includes a lower die 12 formed with the cavity 13 at an upper surface thereof, and an upper die 14 for coverin(l' the cavity 13..
The lovver and upper dies 12 and 14 moves toward and away from each other by a driving means (not shown) to close and open the cavity 13.
Referring to Figs. 3 and 4, in the cavity 13 of the lower die 12, frst and second auxiliary cavity regions 15 and 17 are formed for forming the first and second auxiliary material portions 3 and 4 of the sole 1. The auxiliary cavity regions 15 and 17 are partitioned by respective partitioning walls 16 and 18, which protrude upward from the bottom of the cavity 13, from the residual cavity region. A main material runner 21 is formed at the lower die 12 to connect a main material inlet 20 to the inside of the cavity 13. The main material supplied to the main material inlet 20 can flow through the main material runner 21 into the cavity ]3 A manufacturing method of the sole I having the different material portions will be hereinafter described with reference to Fj J,C~ 5 to 7 CA 022330~4 1998-03-24 First of all, a main material mixture for the main material region 2 is prepared. The main material mixture contains a resin as a main ingredient and a foaming agent. The resin can be selected from one of polyurethane, polystyrene, EVA, PVC and TPR.
Auxiliary material pieces for the auxiliary material portions 3 and 4 are preformed in a solid state. The auxiliary material pieces contain a resin as a main ingredient which can easily cross-link with, prel'erably is identical with, the resin of the main material mixture. Particularly EVA is most preferable for the main ingredients of the main material mixture and auxiliary material pieces.
The material for the auxiliary material pieces may contain a foaming agent. In this case, the auxiliary material pieces must be formed at a temperature lower than an active temperature of the foaming agent to be foamed in the cavity 13 of the mold l O together with the main material mixture. The main material mixture is different from the auxiliary material pieces in the content of the foaming agent or in the kind of the additives contained therein, so that the fabricated sole 1 has the auxiliary material portions with densities, hardnesses or colors different from those of the main material portion.
In a state that the upper die 14 have moved away from the lower die 12 to open the cavity 13, the preformed auxiliary material pieces 3a and 4a for the first and second auxiliary material portions 3 and 4 are placed in the first and second auxiliary cavity regions ] 5 and 17, respectively. Then, the upper die 14 descends to close the cavity 13, as shown in Fig S. After the cavity 13 of the lower die 12 is closed by the upper die 14, the main material mixture is supplied into the cavity ] 3 throu~h the main material CA 022330~4 1998-03-24 runner 21 to f111 up the cavity 13, as shown in Fig. 6.
The main material mixture and the auxiliary material pieces 3a and 4a are maintained together in the cavity 13 at about 170-1 90~ C for about 6-10 minutes. The main material mixture cross-links internally. Also, boundary surfaces of the auxiliary material pieces 3a and 4a with respect to the main material mixture are activated and the cross-linking reaction occurs between the main material mixture and the boundary surfaces and to integrally incorporate the main material and the auxiliary material pieces 3a and 4a.
After a predetermined time, the upper die 14 ascends by the driving means to open the cavity 13. At this time, the integrally incorporated materials rapidly expand by the expansion of foaming gas from the forming agents in the materials and escape from the cavity 13 to form the sole 1, as shown in Fig. 7. The thus-formed sole 1 passes through a process such as a trimming to be formed into a completed product. The completed sole 1 includes the main material portion 2 and the first and second auxiliary material portions 3 and 4, which are different from each other in colors, densities or hardnesses according to the selection of the composition of the auxiliary material pieces 3a and 4a.
As described above, according to the manufacturing method of the present invention, injection-foamed products having different portions with various properties such as color, density and hardness can be easily and eff1ciently obtained in a single mold.
BACKGROUND OF THE INVENTION
The present invention relates to an injection-foamed product having a different material portion and a manufacturing method thereof An injection-foaming method comprises steps of filling up a mixture of resin such as ethylene vinylacetate copolymer (EVA) and a foamin g agent in a cavity having a desired shape which is formed in a mold, maintainin, the mixture in the cavity at about 170-190~ C for about 6-10 minutes and then opening the mold to obtain an inJection-foamed product which is expanded by 30% or more compared with the size of the cavity by the expansion of foaming gas from the foaming agent. The injection-foaming method, which has been developed recently, is not yet prevailing. Howe\,-er, since the injection-foaming, method can promptly and easily provide a foamed product having various shapes and properties, the application thereof is expected to be widely extended.
The injection-foamed product is actively employed as parts for shoes, particularly sports shoes, such as a mid-sole and an out-sole. Recently, an integral sole for shoes has been developed in the shape of the injection-foamed product.
ln conventional sports shoes, an out-sole of rubber is attached onto the lower surface of a mid-sole of a foaming material such as polyurethane, as disclosed in U. S. Patent No. 4,245,406. However, the above-described injection-foaming method can form the mid-sole and the out-sole into one integral piece, thereby to reduce the weight of the product and increase the productivity, resulting in decreasing a manul'acturin~ cost.
However, in the injection-foaming method, since the material is supplied into a cavity of a mold in a fluid state and undergoes a cross-linking reaction for a predetermined time to obtain the injection-foamed product, the fluid material has inevitably homogeneous. Therefore, the product is generally monotonous in properties such as color, density and hardness thereof. Further, the injection-foamed substance is typically inferior to a injection-molded substance or rubber in anti-abrasiveness. In these respects, it will be preferable if the injection-foaming method can provide an injection-foamed product having at least a different material portion to obtain different colors, densities or hardnesses.
SUMMARY OF THE IN~,TENTION
It is an object of the present invention to provide an injection-foamed product having a different material portion and a manufacturing method thereof.
To accomplish the above object, there is provided a method for manufacturing an injection-foamed product having a different material portion, comprising the steps of: preparing a main material mixture containing a main resin and a foaming agent; preforming an auxiliary material piece containing an auxiliary resin which can cross-link with the main resin and having a property different from a property of the main material mixture;
forming an auxiliary cavity region in a cavity of a mold for injection-foaming; placinl the auxiliary material piece in the auxiliary cavity region; filling up the main material mixture in a fluid state in the cavity;
maintaining the main material mixture and the auxiliary material piece in the cavity under a predetermined temperature and pressure for a predetermined CA 022330~4 1998-03-24 time, and opening the mold to obtain the injection-foamed product.
It is preferable that the main material mixture and the auxiliary material piece have the same resin and are different from each other in at least one of color, density and hardness. The same resin may preferably be EVA.
Here, the auxiliary material piece may further contain the foaming agent and is preformed at a temperature lovver than a foaming temperature of the foaming agent.
To accomplish the above object, there is also provided an injection-foamed product having a different material portion manufactured according to the following method: preparing a main material mixture containing a main resin and a foaming agent; preforming an auxiliary material piece containin~ an auxiliary resin which can cross-link with the main resin and having a property different from a property of the main material mixture; .forming an auxiliary cavity re~ion in a cavity of a mold for injection-foaming; placing the auxiliary material piece in the auxiliary cavity region; filling up the main material mixture in a fluid state in the cavity; maintaining the main material mixture and the auxiliary material piece in the cavity under a predetermined temperature and pressure for a predetermined time; and opening the mold to obtain the injection-formed product.
BRIEF DESCRIPTION OF THE DRAWINGS
The above object and advantage of the present invention will become apparent by describing in detail a preferred embodiment thereof vvith reference to the accompanying drawiny,s in which:
Fig. 1 shows a perspective view of a sole for shoes as one application of an injection-foamed product according to the present invention, Fig. 2 shows a sectional view taken along a line II-II in Fig. l;
Fig. 3 shows a sectional view of a mold for explaining an injection-foamed product manufacturing method according to the present invention;
Fi~,. 4 shows a plan view of a lower die in Fig. 3; and Figs. 5 to 7 show sectional views of the mold in Fig. 3, for sequetltially explaining the method accordin~, to the present invention.
DETAILED DESCRIPTlON OF THE INVENTION
Referring to Figs. I and 2, a sole 1, for example, for sports shoes as one application of an injection-foamed product having different material portions according to the present invention has an integral shape in contrast to the conventional sports shoes in which a mid-sole and an out-sole are separately formed.
The sole I includes a main material portion 2 occupying most of the sole I and f rst and second auxiliary material portions 3 and 4 occupying a part of the lower surface of the sole 1. The main material portion 2 and the first and second auxiliary material portions 3 and 4 contain resin materials which can cross-link with each other under a predetermined condition. It is preferable that the resin materials are identical with each other. Preferably, one of polyurethane, polystyrene, EVA, PVC and TPR (thermoplastic rubber), particularly EVA may be used for the resin materials.
The main material portion 2 and the first and second auxi]iary material portions 3 and 4 may have different densities, hardnesses, elasticities CA 022330~4 1998-03-24 or colors by adjusting contents and kinds of foaming agents or additives contained in the main and auxiliary materials. For example, an auxiliary material portion having higher anti-abrasiveness, density or hardness than the main material portion can be applied to a heel region of a sole. Auxiliary material portions having different colors allow a injection-foamed product to be designed with two-tone or multi-tone color.
Fi~g. 3 shows a sectional view of a mold 10 for forming the sole ]
having the auxiliary material portions 3 and 4 and Fig. 4 is a plan view of a lower die in Fig. 3. Here, the shape of a cavity 13 formed in the mo]d 10 is simplil'ied as compared with the sole I shown in Fig. 1, for convenience of description.
The mold 10 includes a lower die 12 formed with the cavity 13 at an upper surface thereof, and an upper die 14 for coverin(l' the cavity 13..
The lovver and upper dies 12 and 14 moves toward and away from each other by a driving means (not shown) to close and open the cavity 13.
Referring to Figs. 3 and 4, in the cavity 13 of the lower die 12, frst and second auxiliary cavity regions 15 and 17 are formed for forming the first and second auxiliary material portions 3 and 4 of the sole 1. The auxiliary cavity regions 15 and 17 are partitioned by respective partitioning walls 16 and 18, which protrude upward from the bottom of the cavity 13, from the residual cavity region. A main material runner 21 is formed at the lower die 12 to connect a main material inlet 20 to the inside of the cavity 13. The main material supplied to the main material inlet 20 can flow through the main material runner 21 into the cavity ]3 A manufacturing method of the sole I having the different material portions will be hereinafter described with reference to Fj J,C~ 5 to 7 CA 022330~4 1998-03-24 First of all, a main material mixture for the main material region 2 is prepared. The main material mixture contains a resin as a main ingredient and a foaming agent. The resin can be selected from one of polyurethane, polystyrene, EVA, PVC and TPR.
Auxiliary material pieces for the auxiliary material portions 3 and 4 are preformed in a solid state. The auxiliary material pieces contain a resin as a main ingredient which can easily cross-link with, prel'erably is identical with, the resin of the main material mixture. Particularly EVA is most preferable for the main ingredients of the main material mixture and auxiliary material pieces.
The material for the auxiliary material pieces may contain a foaming agent. In this case, the auxiliary material pieces must be formed at a temperature lower than an active temperature of the foaming agent to be foamed in the cavity 13 of the mold l O together with the main material mixture. The main material mixture is different from the auxiliary material pieces in the content of the foaming agent or in the kind of the additives contained therein, so that the fabricated sole 1 has the auxiliary material portions with densities, hardnesses or colors different from those of the main material portion.
In a state that the upper die 14 have moved away from the lower die 12 to open the cavity 13, the preformed auxiliary material pieces 3a and 4a for the first and second auxiliary material portions 3 and 4 are placed in the first and second auxiliary cavity regions ] 5 and 17, respectively. Then, the upper die 14 descends to close the cavity 13, as shown in Fig S. After the cavity 13 of the lower die 12 is closed by the upper die 14, the main material mixture is supplied into the cavity ] 3 throu~h the main material CA 022330~4 1998-03-24 runner 21 to f111 up the cavity 13, as shown in Fig. 6.
The main material mixture and the auxiliary material pieces 3a and 4a are maintained together in the cavity 13 at about 170-1 90~ C for about 6-10 minutes. The main material mixture cross-links internally. Also, boundary surfaces of the auxiliary material pieces 3a and 4a with respect to the main material mixture are activated and the cross-linking reaction occurs between the main material mixture and the boundary surfaces and to integrally incorporate the main material and the auxiliary material pieces 3a and 4a.
After a predetermined time, the upper die 14 ascends by the driving means to open the cavity 13. At this time, the integrally incorporated materials rapidly expand by the expansion of foaming gas from the forming agents in the materials and escape from the cavity 13 to form the sole 1, as shown in Fig. 7. The thus-formed sole 1 passes through a process such as a trimming to be formed into a completed product. The completed sole 1 includes the main material portion 2 and the first and second auxiliary material portions 3 and 4, which are different from each other in colors, densities or hardnesses according to the selection of the composition of the auxiliary material pieces 3a and 4a.
As described above, according to the manufacturing method of the present invention, injection-foamed products having different portions with various properties such as color, density and hardness can be easily and eff1ciently obtained in a single mold.
Claims (5)
1. A method for manufacturing an injection-foamed product having a different material portion, comprising the steps of:
preparing a main material mixture containing a main resin and a foaming agent, preforming an auxiliary material piece containing an auxiliary resin which can cross-link with the main resin and having a property different from a property of the main material mixture, forming an auxiliary cavity region in a cavity of a mold for injection-foaming.
placing the auxiliary material piece in the auxiliary cavity region, filling up the main material mixture in a fluid state in the cavity, maintaining the main material mixture and the auxiliary material piece in the cavity under a predetermined temperature and pressure for a predetermined time, and opening the mold to obtain the injection-foamed product.
preparing a main material mixture containing a main resin and a foaming agent, preforming an auxiliary material piece containing an auxiliary resin which can cross-link with the main resin and having a property different from a property of the main material mixture, forming an auxiliary cavity region in a cavity of a mold for injection-foaming.
placing the auxiliary material piece in the auxiliary cavity region, filling up the main material mixture in a fluid state in the cavity, maintaining the main material mixture and the auxiliary material piece in the cavity under a predetermined temperature and pressure for a predetermined time, and opening the mold to obtain the injection-foamed product.
2. A method as claimed in claim 1, wherein the main material mixture and the auxiliary material piece have the same resin and are different from each other in at least one of color, density and hardness.
3. A method as claimed in claim 2, wherein the same resin is EVA.
4. A method as claimed in claim 3, wherein said auxiliary material piece further contains the foaming agent and is preformed at a temperature lower than a foaming temperature of the foaming agent.
5. An injection-foamed product having a different material portion manufactured according to the following method of claim 1:
preparing a main material mixture containing a main resin and a foaming agent;
preforming an auxiliary material piece containing an auxiliary resin which can cross-link with the main resin and having a property different from a property of the main material mixture;
forming an auxiliary cavity region in a cavity of a mold for injection-foaming;
placing the auxiliary material piece in the auxiliary cavity region;
filling up the main material mixture in a fluid state in the cavity, maintaining the main material mixture and the auxiliary material piece in the cavity under a predetermined temperature and pressure for a predetermined time; and opening the mold to obtain the injection-formed product.
preparing a main material mixture containing a main resin and a foaming agent;
preforming an auxiliary material piece containing an auxiliary resin which can cross-link with the main resin and having a property different from a property of the main material mixture;
forming an auxiliary cavity region in a cavity of a mold for injection-foaming;
placing the auxiliary material piece in the auxiliary cavity region;
filling up the main material mixture in a fluid state in the cavity, maintaining the main material mixture and the auxiliary material piece in the cavity under a predetermined temperature and pressure for a predetermined time; and opening the mold to obtain the injection-formed product.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970043010A KR100256180B1 (en) | 1997-08-29 | 1997-08-29 | Injection foaming product and manufacturing method thereof |
| KR97-43010 | 1997-08-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2233054A1 true CA2233054A1 (en) | 1999-02-28 |
Family
ID=19519520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002233054A Abandoned CA2233054A1 (en) | 1997-08-29 | 1998-03-24 | Injection-foamed product and manufacturing method thereof |
Country Status (10)
| Country | Link |
|---|---|
| JP (1) | JP3083800B2 (en) |
| KR (1) | KR100256180B1 (en) |
| CN (1) | CN1211498A (en) |
| BR (1) | BR9800935A (en) |
| CA (1) | CA2233054A1 (en) |
| DE (1) | DE19812694A1 (en) |
| ES (1) | ES2164499B1 (en) |
| ID (1) | ID20771A (en) |
| IT (1) | ITTO980257A1 (en) |
| TW (1) | TW424038B (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020073125A (en) * | 2002-09-05 | 2002-09-19 | 이동락 | manufacturing method and mould for the shoe-sole which has different colors or hardness |
| JP4463667B2 (en) * | 2004-12-01 | 2010-05-19 | 日東電工株式会社 | Foam filling material |
| KR100662548B1 (en) * | 2005-11-02 | 2006-12-28 | 박장원 | Injection molding process |
| WO2007066899A1 (en) * | 2005-11-02 | 2007-06-14 | Jang Won Park | Injection molding process |
| KR100689964B1 (en) | 2006-06-21 | 2007-03-08 | 박장원 | Method for manufacturing crosslinked foam |
| ES2361315B1 (en) * | 2009-06-18 | 2012-04-20 | Vulcanizados Argus, S.L | METHOD OF MANUFACTURE OF A BASE-FLOOR ASSEMBLY FOR FOOTWEAR AND BASE-FLOOR ASSEMBLY MANUFACTURED WITH SUCH METHOD. |
| CN102173074B (en) * | 2011-01-21 | 2016-06-08 | 许建华 | A kind of production method of sole |
| KR101338482B1 (en) * | 2011-11-07 | 2013-12-10 | 동신산업(주) | Method for Preparing Buoy Member Using EPP and Buoy Member Thereof |
| CN103009553A (en) * | 2012-12-13 | 2013-04-03 | 德尔惠(中国)有限公司 | Manufacturing process of double-color double-density soles |
| US10172415B2 (en) | 2014-04-14 | 2019-01-08 | Nike, Inc. | Sole assembly formed from multiple preforms and method and mold for manufacturing same |
| US10226906B2 (en) * | 2014-04-14 | 2019-03-12 | Nike, Inc. | Method of manufacturing sole assembly formed of multiple preforms |
| CN105291351A (en) * | 2015-11-14 | 2016-02-03 | 重庆跃发日用品有限公司 | Arranging structure for hard spheres, for massaging slipper sole, in manufacturing die |
| CN105291350A (en) * | 2015-11-14 | 2016-02-03 | 重庆跃发日用品有限公司 | Arranging method for arranging hard balls in protrusions of massaging slipper sole |
| CN105459327A (en) * | 2015-11-14 | 2016-04-06 | 重庆跃发日用品有限公司 | Production method for massaging slipper soles |
| CN105291377A (en) * | 2015-11-14 | 2016-02-03 | 重庆跃发日用品有限公司 | Manufacturing die of massaging slipper soles |
| CN110216851B (en) * | 2018-03-02 | 2021-12-31 | 彰洋材料股份有限公司 | Variable-pressure injection mold, injection shoe material and manufacturing method thereof |
| IT201900012519A1 (en) * | 2019-07-22 | 2021-01-22 | Nea Srl | "Mold for the application of a leather template in the tread of an elastomeric hull of an après-ski and its manufacturing process" |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4245406A (en) * | 1979-05-03 | 1981-01-20 | Brookfield Athletic Shoe Company, Inc. | Athletic shoe |
| EP0485639B1 (en) * | 1990-11-10 | 1995-03-29 | Kuo-Nan Yang | EVA insole manufacturing process |
| JP2589650B2 (en) * | 1993-11-27 | 1997-03-12 | 株式会社アサヒコーポレーション | Molding method of foam polyurethane sole |
| US5453230A (en) * | 1993-12-02 | 1995-09-26 | Urethane Technologies, Inc. | Method for rotationally molding an article with a vulnerable insert |
| JP2764198B2 (en) * | 1994-01-29 | 1998-06-11 | 株式会社アサヒコーポレーション | Forming method for foam soles |
| CA2148646C (en) * | 1994-06-14 | 2005-06-14 | Dezi Anthony Krajcir | Resilient molded shoe heels |
| JPH0857985A (en) * | 1994-08-23 | 1996-03-05 | Moon Star Co | Manufacture of injection molded shoe |
-
1997
- 1997-08-29 KR KR1019970043010A patent/KR100256180B1/en not_active IP Right Cessation
- 1997-12-29 JP JP09369633A patent/JP3083800B2/en not_active Expired - Fee Related
-
1998
- 1998-03-23 DE DE19812694A patent/DE19812694A1/en not_active Ceased
- 1998-03-23 TW TW087104281A patent/TW424038B/en not_active IP Right Cessation
- 1998-03-24 CA CA002233054A patent/CA2233054A1/en not_active Abandoned
- 1998-03-24 ID IDP980420A patent/ID20771A/en unknown
- 1998-03-24 IT IT98TO000257A patent/ITTO980257A1/en unknown
- 1998-03-26 CN CN98105889A patent/CN1211498A/en active Pending
- 1998-03-27 ES ES009800657A patent/ES2164499B1/en not_active Expired - Lifetime
- 1998-03-31 BR BR9800935-4A patent/BR9800935A/en not_active Application Discontinuation
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|---|---|
| DE19812694A1 (en) | 1999-03-04 |
| KR19990019616A (en) | 1999-03-15 |
| ITTO980257A1 (en) | 1999-09-24 |
| ES2164499B1 (en) | 2003-05-16 |
| KR100256180B1 (en) | 2000-05-15 |
| JP3083800B2 (en) | 2000-09-04 |
| CN1211498A (en) | 1999-03-24 |
| ID20771A (en) | 1999-03-04 |
| BR9800935A (en) | 2000-05-23 |
| TW424038B (en) | 2001-03-01 |
| JPH1177745A (en) | 1999-03-23 |
| ES2164499A1 (en) | 2002-02-16 |
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