GB2076725A - Method of making laminated sole - Google Patents

Method of making laminated sole Download PDF

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Publication number
GB2076725A
GB2076725A GB8017203A GB8017203A GB2076725A GB 2076725 A GB2076725 A GB 2076725A GB 8017203 A GB8017203 A GB 8017203A GB 8017203 A GB8017203 A GB 8017203A GB 2076725 A GB2076725 A GB 2076725A
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GB
United Kingdom
Prior art keywords
solid rubber
sheet
rubber sheet
mold
rubber
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
GB8017203A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB8017203A priority Critical patent/GB2076725A/en
Publication of GB2076725A publication Critical patent/GB2076725A/en
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B13/00—Soles; Sole-and-heel integral units
    • A43B13/02—Soles; Sole-and-heel integral units characterised by the material
    • A43B13/04—Plastics, rubber or vulcanised fibre
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B25/045—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B13/00—Soles; Sole-and-heel integral units
    • A43B13/02—Soles; Sole-and-heel integral units characterised by the material
    • A43B13/12—Soles with several layers of different materials
    • 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
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0078—Measures or configurations for obtaining anchoring effects in the contact areas between layers
    • B29C37/0082—Mechanical anchoring
    • 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
    • B29C43/021—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface
    • 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
    • B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/78—Moulding material on one side only of the preformed 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
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed 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
    • B29K2021/00—Use of unspecified rubbers 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0207—Materials belonging to B32B25/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/72—Cured, e.g. vulcanised, cross-linked

Abstract

A method of making a laminated sole comprises the steps of: (i) providing a sheet 3 of cured foamed rubber, (ii) providing a sheet 4 of unvulcanised solid rubber, (iii) placing the foamed rubber sheet and the solid rubber sheet in a multi- part openable and closable mold 1, 2 in which a plurality of blind holes 5 open from a major face bounding the cavity of the mold, the solid rubber sheet being placed in contact with the major face, (iv) closing the mold to apply pressure forcing the sponge rubber sheet and the solid rubber sheet together, and at the same time applying heating to vulcanize the solid rubber, whereby as a result of the heat and pressure the solid rubber is forced into the interstices of the foamed rubber to form a bond therewith, and into the blind holes of the mold. <IMAGE>

Description

SPECIFICATION Method of making laminated sole The present invention relates to a laminated sole, and more particularly to a method of making a laminated sole composed of a foamed rubber sheet and a solid rubber sheet.
Soles laminated by foamed rubber sheet and solid rubber sheet have been well known in the art and extensively used. These soles are conventionally made by the steps comprising coating a strongly bonding adhesive on either side of the surface of the sheets to be laminated, allowing the coated adhesive to dry appropriately, superimposing the sheets and applying a force on said sheets, for a considerable length of time, to attain a desired interlayer bonding strength. This method involves a tedious manual operaton, which results in low production efficiency and higher cost, and even more the quality of the product thus produced is generally not consistent and will readily cause delamination during use.
To eliminate the shortcomings of the abovementioned method, the inventor has attempted to make the laminated sheet composed of a foamed rubber sheet and a solid rubber sheet by use of a hot press without the application of adhesives conventionally used in the art but anyhow the combination of the sheets has not been obtained.
Through the various tests, the inventor has astonishgly found out that sufficiently strong interlayer bonding effect can be obtained by using an unvulcanized solid rubber sheet in substitution of the above mentioned solid rubber sheet to laminate with a foamed rubber sheet in a hot press mold under the predetermined conditions.
However the laminated sheet thus formed would cause considerably warping which leads the project to fail to meet the desired use.
After study of the above mentioned interlayer bonding effect and warping problems, the inventor has reached a conclusion and completed the present invention therefrom.
Specifically speaking, when a foamed rubber sheet and an unvulcanized solid rubber are pl#aced in a superimposed position and hot pressed, the latter will proceed to vulcanization or curing.
During this process the said unvulcanized rubber will simultaneously generate (exhibit) bonding and flowing properties by itself and the latter causes material to flow into the micells or voids of the foamed rubber sheet.
The intrusion of the material into the micells of the foamed rubber sheet produces a so-called anchoring effect and this operates synergistically with the bonding property of the material to further strengthen the interlayer bonding of the laminated sheet. Of course, there is no need to use any such adhesives or glues as used in the prior art method.
As noted above, the laminated sheet obtained from this hot press method, when it cools, will be subject to warping. Through the study on this undesirable warping phenomenon, the inventor has ascertained that it is essentially and solely due to the difference in contraction between the two sheets, namely the foamed rubber sheet has a greater contraction ratio compared with that of the unvulcanized rubber sheet which is now vulcanized. In order to overcome this problem, a series of tests has been conducted by the present inventor, which led to the completion of this invention.
The present invention is now described with reference to the single figure of annexed drawing which is a schematic longitudinal section view of a mold containing two sheets to be laminated in accordance with the present invention. The mold consists of a lower half-mold (1) and an upper half-mold (2). The bottom of the lower half-mold (1), in whose cavity is placed an unvulcanized solid rubber sheet, is provided with plurality of blind holes (5) of appropriate size, for instance, preferably a cylindrical hole having a diameter of less than 10 millimeters, arranged either regularly or randomly.
The solid rubber sheet to be placed in the cavity of the lower half-mold should be so calculated that when the sheet is subjected to the combination of heat and pressure, the material of said sheet, after filling up all the holes formed on the bottom of the half-mold and intruding into the micells of the adjacent foamed rubber sheet (3), should be still sufficient to form a thin layer of a thickness of approximately 2 millimeters or less.
This thin layer firmly bonds to the foamed rubber sheet owing to the reasons given above and has considerably good flexibility, therefore said layer will follow the contraction of the foamed rubber sheet to thereby prevent the laminated sheet from warping.
As used herein, the word "foamed rubber sheet" refers to the sheet conventionally made for the purpose of sole making and the word "unvulcanized solid rubber sheet" refers to the sheet that already had vulcanizing agent added but is not yet completely vulcanized or cured.
The following examples are presented in illustration of the method of this invention and are not intended as an undue limitation on the generally broad scope thereof.
Example 1 Into the cavity of the lower half-mold (1 ) were placed an unvulcanized solid rubber sheet (4) and a foamed rubber sheet (3), both having a predetermined thickness and weight, in superimposed arrangement with the unvulcanized solid rubber sheet contacting with the lower halfmold. The hot pressing was carried out in a press of conventional type at a temperature of 1 500C and under the pressure of 1 50Kg/cm2 (gage) for about 2 minutes. After this hot pressing step, the article was removed from the mold and cooled to the ambient temperature. The article thus obtained had a layer of the solid rubber (4) of a thickness of about 2 millimeters and exhibited an excellent interlayer bonding strength confirmed by peeling test. In the meantime this article did not cause warping.
Example 2 Example 1 was repeated except that a reduced amount of the unvulcanized solid rubber sheet was used, which is just enough to fill up the holes provided in the lower half-mold.
The article obtained from this example had a plurality of protrusions corresponding to the holes, and these protrusions bonded firmly to the foamed rubber sheet. This article did not cause warping.

Claims (6)

1. A method of making a laminated sole, which comprises the steps of: (i) providing a sheet of cured foam rubber, (ii) providing a sheet of unvulcanized solid rubber, (iii) placing the foamed rubber sheet and the solid rubber sheet in a multi-part openable and closable mold in which a plurality of blind holes open from a major face bounding the cavity of the mold, the solid rubber sheet being placed in contact with the major face, (iv) closing the mold to apply pressure forcing the sponge rubber sheet and the solid rubber sheet together, and at the same time applying heating to vulcanize the solid rubber, whereby as a result of the heat and pressure the solid rubber is forced into the interstices of the foamed rubber to form a bond therewith, and into the blind holes of the mold.
2. A method claimed in claim 1 wherein the thickness of the foamed rubber sheet and of the solid rubber sheet are so seiected in relation to the dimensions of the cavity of the mold when closed that, after the application of heat and pressure, the solid rubber is in the form of a relatively thinner layer bonded at one face to the surface of the sponge rubber and at the opposite faces having protrusions formed of solid rubber which has passed into the blind holes.
3. A method as claimed in claim 2 wherein the relatively thinner layer of solid rubber has a thickness not exceeding two millimeters.
4. A method as claimed in claim 1 wherein the thicknesses of foamed rubber sheet and of the solid rubber sheet are so selected in relation to the dimensions of the cavity of the mold when closed that, after the application of heat and pressure, the solid rubber is in the form of a plurality of protrusions formed of solid rubber which has passed into the blind holes, the protrusions each being bonded to the surface of the foamed rubber sheet.
5. A method as claimed in claim 1 substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
6. A laminated sole whenever prepared by a method as claimed in any one of claims 1 to 5.
GB8017203A 1980-05-23 1980-05-23 Method of making laminated sole Withdrawn GB2076725A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8017203A GB2076725A (en) 1980-05-23 1980-05-23 Method of making laminated sole

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8017203A GB2076725A (en) 1980-05-23 1980-05-23 Method of making laminated sole

Publications (1)

Publication Number Publication Date
GB2076725A true GB2076725A (en) 1981-12-09

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Family Applications (1)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0219593A2 (en) * 1985-09-16 1987-04-29 Manufactura Espanola Del Caucho, S.A. A process for the production of soles for shoes
EP0383489A1 (en) * 1989-02-16 1990-08-22 Lambert Howarth Safety Limited Slip-resistant sole for footwear
EP0575692A1 (en) * 1992-04-30 1993-12-29 Kl˦ckner Desma GmbH Method and device for injection moulding double-layered shoe soles made from rubber
ES2068759A2 (en) * 1993-05-21 1995-04-16 Dc Company Spain S A Process for manufacturing footwear with soles of material obtained from spent tyres
EP0714760A1 (en) * 1994-06-17 1996-06-05 Araco Kabushiki Kaisha Laminated body and method of manufacturing the same
EP0893112A1 (en) * 1997-07-23 1999-01-27 Globus Berkemann GmbH & Co. KG Orthopeadic support
CN108477749A (en) * 2018-03-30 2018-09-04 福建泉州中博新材料有限公司 It is a kind of that there are the rubber soles and its production technology for being integrally formed built-in air cushion layer
WO2020219828A1 (en) * 2019-04-26 2020-10-29 Nike Innovate C.V. Method of applying outsole to an article of footwear
US11426962B2 (en) 2019-04-26 2022-08-30 Nike, Inc. Method of applying outsole to an article of footwear

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0219593A2 (en) * 1985-09-16 1987-04-29 Manufactura Espanola Del Caucho, S.A. A process for the production of soles for shoes
EP0219593A3 (en) * 1985-09-16 1988-07-27 Manufactura Espanola Del Caucho, S.A. A process for the production of soles for shoes
EP0383489A1 (en) * 1989-02-16 1990-08-22 Lambert Howarth Safety Limited Slip-resistant sole for footwear
WO1990009116A1 (en) * 1989-02-16 1990-08-23 Burlington International Group Plc Slip-resistant sole for footwear
EP0575692A1 (en) * 1992-04-30 1993-12-29 Kl˦ckner Desma GmbH Method and device for injection moulding double-layered shoe soles made from rubber
ES2068759A2 (en) * 1993-05-21 1995-04-16 Dc Company Spain S A Process for manufacturing footwear with soles of material obtained from spent tyres
US5804292A (en) * 1994-06-17 1998-09-08 Araco Kabushiki Kaisha Laminated articles method of making
EP0714760A4 (en) * 1994-06-17 1998-02-11 Araco Kk Laminated body and method of manufacturing the same
EP0714760A1 (en) * 1994-06-17 1996-06-05 Araco Kabushiki Kaisha Laminated body and method of manufacturing the same
EP0893112A1 (en) * 1997-07-23 1999-01-27 Globus Berkemann GmbH & Co. KG Orthopeadic support
CN108477749A (en) * 2018-03-30 2018-09-04 福建泉州中博新材料有限公司 It is a kind of that there are the rubber soles and its production technology for being integrally formed built-in air cushion layer
CN108477749B (en) * 2018-03-30 2024-04-12 福建泉州中博新材料有限公司 Rubber sole with integrally formed built-in air cushion layer and production process thereof
WO2020219828A1 (en) * 2019-04-26 2020-10-29 Nike Innovate C.V. Method of applying outsole to an article of footwear
US11426962B2 (en) 2019-04-26 2022-08-30 Nike, Inc. Method of applying outsole to an article of footwear
US11724475B2 (en) 2019-04-26 2023-08-15 Nike, Inc. Method of applying outsole to an article of footwear
US11758985B2 (en) 2019-04-26 2023-09-19 Nike, Inc. Method of applying outsole to an article of footwear

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)