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GB2105251A - A mould for use in the moulding of plastics materials - Google Patents

A mould for use in the moulding of plastics materials Download PDF

Info

Publication number
GB2105251A
GB2105251A GB08220725A GB8220725A GB2105251A GB 2105251 A GB2105251 A GB 2105251A GB 08220725 A GB08220725 A GB 08220725A GB 8220725 A GB8220725 A GB 8220725A GB 2105251 A GB2105251 A GB 2105251A
Authority
GB
United Kingdom
Prior art keywords
layer
concrete
mould
working surface
concrete layer
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Withdrawn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
GB08220725A
Inventor
Alastair Ian Stirling
Alan D Muirhead
Geoffrey Hugh Wainwright
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.)
NEW PRESS TOOLS Ltd
Original Assignee
NEW PRESS TOOLS 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 NEW PRESS TOOLS Ltd filed Critical NEW PRESS TOOLS Ltd
Priority to GB08220725A priority Critical patent/GB2105251A/en
Publication of GB2105251A publication Critical patent/GB2105251A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/24—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass dies
    • 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
    • B29C33/02—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
    • 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
    • B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
    • 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
    • B29K2709/00—Use of inorganic materials not provided for in groups B29K2703/00 - B29K2707/00, for preformed parts, e.g. for inserts
    • B29K2709/06—Concrete
    • 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
    • B29K2905/00—Use of metals, their alloys or their compounds, as mould material
    • B29K2905/08—Transition metals
    • B29K2905/12—Iron
    • 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
    • B29K2909/00—Use of inorganic materials not provided for in groups B29K2803/00 - B29K2807/00, as mould material
    • B29K2909/02—Ceramics
    • 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
    • B29K2909/00—Use of inorganic materials not provided for in groups B29K2803/00 - B29K2807/00, as mould material
    • B29K2909/06—Concrete

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Moulds, Cores, Or Mandrels (AREA)

Abstract

The mould e.g. a compression mould comprises at least two mould members defining a moulding cavity and means for heating at least one of the mould members. The method of making the at least one mould member comprises forming a layer (4) of concrete, a working surface of which defines a surface of an article to be moulded. Electrical heating means (21) are embedded within e.g. sequentially formed layers (13), of the concrete layer (14), so as to heat the working surface of the concrete layer. The layer of concrete is secured by a surface other than the said working surface, to a support (5) e.g. of foam concrete material, and the working surface of the concrete layer is coated with a layer (6) of material which provides a smooth surface. The layers (1, 3) may be glass fibre reinforced, and may be brushed or sprayed onto a former. The layer (6) may comprise a ceramic material sprayed onto the working surface of the layer (4), or a stainless steel sheet which may have comprised the former on which the layer (4) has been formed. <IMAGE>

Description

SPECIFICATION A mould for use in the moulding of plastics materials The present invention relates to a mould for use in the moulding of plastics materials and to a method of manufacturing such a mould.
In compression moulding a plastics material is placed between male and female members of a mould. The mould is closed, and heat and pressure are applied. The plastics material flows to fill the mould. After setting, the moulded article is removed.
Conventional compression moulds are manufactured from solid blocks of tool steel and means must be provided in the steel to enable heating ofthe mould. Manufacturing the mould members from tool steel and shaping the steel to accommodate heating means is an extremely expensive procedure, requiring the labour of skilled tool makers.
It is an object ofthe present invention to provide a mould and a method of manufacturing a mould which is relatively cheap.
According to the present invention there is provided a method of manufacturing a mould comprising at least two mould members defining a working surface to the shape of which a material to be moulded is to conform and means for heating at least one ofthe mould members, characterised in that said at least one mould member is fabricated by forming a layer of concrete, a working surface of which conforms to a surface of an article to be moulded, embedding electrical heating means within said concrete layer so as to enable heating of said working surface ofthe concrete layer, and securing the layer of concrete by a surface other than the said working surface to a support, the working surface ofthe concrete layer being covered with a material which provides a smooth surface.
Preferably the electrical heating means is embedded in the concrete layer by forming a first layer of concrete, pushing the electrical heating means into the said first layer whilst it is still soft, and building up the concrete layer by applying a second layer of concrete over the first layer of concrete and the electrical heating means. The concrete may be reinforced with glass fibres and sprayed onto a former.
The former may be made of wood or a sheet material. The sheet material, for example stainless steel sheet, may form the smooth surface ofthe mould after the concrete has hardened.
The material which provides a smooth surface may be applied to the formed concrete by spraying for example a ceramic layer onto the working surface ofthe concrete layer, or may be simply fabricated from sheet material such as stainless steel.
Preferably the mould support is formed from foam concrete.
According to a second aspect of the present invention there is provided a mould comprising at least two mould members defining a working surface to the shape of which a material to be moulded is to conform, and means for heating at least one of the mould members, characterised in that said at least one mould member comprises a layer of concrete, a working surface of which conforms to a surface of the article to be moulded, electrical heating means embedded within said concrete layer to heat the working surface of the concrete layer, means secured to a surface of the concrete layer other than the working surface to support the concrete layer, and a layer of material covering the working surface of the concrete layer to provide a smooth surface.
An embodiment of the present invention will now be described, by way of example, with reference to the accompanying drawing, which shows a crosssectional view of the male member of a mould embodying the present invention.
It will be appreciated that whilst only the male member of a mould is shown in the accompanying drawing the following description also applies to the fabrication of a corresponding female mould member.
Referring to the accompanying drawing the mould member shown is formed on a former, not shown.
The former may be fabricated from any easily worked material, for example, wood. The surface of the former upon which the mould member is formed is coated with a smooth material, for example, poly vinyl acetate, in order to give a smooth surface from which the mould member may be peeled off when building up on the former is completed.
The mould member is fabricated by first applying a layer of concrete 1 approximately 41 of an inch thick over the working face of the former. In order to give added strength the concrete is impregnated with glass fibres. The concrete may be brushed on to the former but ideally is sprayed on. Electrical heating rods are then pressed into the concrete layer 1 whilst it is still soft. The electrical heating rods 2 are arranged so as to give an approximately even distribution of heat to the working face of the mould member. The concrete layer 1 is then built up to a total thickness of approximately 2 inches by covering it and the heating rods 2 with concrete layer 3.
The concrete layer 3 is also reinforced with glass fibres and may also be either brushed or sprayed on.
When the concrete layer 4 formed by concrete layers 1 and 3 has set a concrete base 5 is formed over it. The concrete base 5 provides support to the concrete layer 4 when the mould member is in use.
Ideally the concrete base 5 is formed from foam concrete in order to keep the weight of the mould member low and also to provide heat insulation for the working face ofthe mould member itself.
When the concrete base 4 has set, the partially completed mould member is removed from the former. A layer of ceramic material 6 is then sprayed over the working face ofthe mould member in order to prevent flaking off of the concrete whilst the mould member is in use and also to provide a smooth surface. In order to ensure that the ceramic layer adheres to concrete, the working face may first be roughened by using shot blasting techniques.
The completed mould member may then be mounted in a conventional jig ready for use.
It will be appreciated that whilst not shown in the accompanying drawing means are provided to enable the electrical heating rods 2 to be connected up to an electrical energy source.
It will further be appreciated that the shape of the mould members is not restricted to that shown in the accompanying drawing and hat the present invention may, in fact, be applied to moulds for producing products having a wide variety of shapes.
In the described embodiment the smooth working surface is provided by a sprayed on ceramic material. As an alternative a sheet material such as stainless steel could be used. Advantageously, the former upon which the concrete is formed may be defined by a sheet material which becomes permanently attached to the concrete when it hardens. A separate step to provide the surface layer 6 is thus not required.
The term "plastics" is used herein in a broad sense and is intended to cover any materials which when subject to heat and pressure in a mould permanently conform to the shape ofthe mould, e.g. cellulosic fibres impregnated with phenol or acrylic resin, or glass reinforced plastics.
The term "concrete" is also used herein in a broad sense and is intended to cover any material which has similar mouldability, strength and rigidity characteristics to conventional building concrete formed from Portland cement and appropriate fillers such as sand.

Claims (19)

1. A method of manufacturing a mould comprising at least two mould members defining a working surface to the shape of which a material to be moulded is to conform, and means for heating at least one of the mould members, characterised in that said at least one mould member is fabricated by forming a layer of concrete, a working surface of which conforms to a surface of an article to be moulded, embedding electrical heating means within said concrete layer so as to enable heating of said working surface ofthe concrete layer, and sec uring the layer of concrete by a surface other than the said working surface to a support, the working surface ofthe concrete layer being covered by a layer of material which provides a smooth surface.
2. A method according to claim 1, characterised in that the electrical heating means is embedded in the concrete layer by forming a first layer of concrete, pushing the electrical heating means into the said first layer whilst it is still soft, and building up the concrete layer by applying a second layer of con crete over the first layer of concrete and the electrical heating means.
3. A method according to claim 1 or 2, character ised in that the concrete layer is impregnated with glass fibre reinforcement.
4. A method according to claim 1, 2 or 3, charac terised in that the working surface ofthe concrete layer is derived by forming the concrete layer on a former.
5. A method according to claim 4, characterised in that the concrete layer is formed by spraying con crete onto the former.
6. A method according to claim 4 or 5, character ised in that the former is made of wood.
7. A method according to claim 4 or 5, character ised in that the former is made of a sheet material which after the concrete hardens is permanently attached thereto and forms the said smooth surface.
8. A method according to claim 7, characterised in that the former is made from stainless steel sheet.
9. A method according to any one of claims 1 to 6, characterised in that the material which provides a smooth surface is sprayed onto the working surface of the concrete layer.
10. A method according to any one of claims 1 to 6 or claim 9, characterised in that the said layer of material comprises a layer of ceramic material.
11. A method according to any one of claims 1 to 6, characterised in that the material which provides a smooth surface is in the form of a sheet material attached to the concrete layer after it has been formed.
12. A method according to claim 11, wherein the sheet material is stainless steel.
13. A method according to any preceding claim characterised in that the support means comprises foam concrete.
14. A mould comprising at least two mould members defining a working surface to the shape of which a material to be moulded is to conform, and means for heating at least one of the mould members, characterised in that said at least one mould member comprises a layer of concrete, a working surface of which conforms to a surface of the article to be moulded, electrical heating means embedded within said concrete layerto heat the working surface of the concrete layer, means secured to a surface of the concrete layer other than the working surface to support the concrete layer, and a layer of material covering the working surface ofthe concrete layer to provide a smooth surface.
15. A mould according to claim 14, characterised in that the layer of material covering the working surface is of stainless steel.
16. A mould according to claim 14, characterised in that the layer of material covering the working surface is ceramic.
17. A mould, manufactured in accordance with any one of claims 1 to 13.
18. A method of manufacture substantially as hereinbefore described with reference to the accompanying drawing.
19. A mould substantially as hereinbefore described with reference to the accompanying drawing.
GB08220725A 1981-07-16 1982-07-16 A mould for use in the moulding of plastics materials Withdrawn GB2105251A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08220725A GB2105251A (en) 1981-07-16 1982-07-16 A mould for use in the moulding of plastics materials

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8122017 1981-07-16
GB08220725A GB2105251A (en) 1981-07-16 1982-07-16 A mould for use in the moulding of plastics materials

Publications (1)

Publication Number Publication Date
GB2105251A true GB2105251A (en) 1983-03-23

Family

ID=26280154

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08220725A Withdrawn GB2105251A (en) 1981-07-16 1982-07-16 A mould for use in the moulding of plastics materials

Country Status (1)

Country Link
GB (1) GB2105251A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2552012A1 (en) * 1983-09-19 1985-03-22 Aerospatiale METHOD OF MANUFACTURING A MOLD FOR MAKING LARGE MOLDED PARTS MADE OF COMPOSITE MATERIAL, MOLD OBTAINED BY MEANS OF THIS PROCESS AND POLYMERIZED PART MADE BY MEANS OF THIS MOLD
GB2172542A (en) * 1985-03-19 1986-09-24 Hazeldine Ind Group Limited Moulds
EP0341797A1 (en) * 1988-05-11 1989-11-15 Dsm N.V. Mould and process for the fabrication thereof
EP0351154A2 (en) * 1988-07-14 1990-01-17 Neste Oy Metal-coated plastic product mould and procedure for manufacturing the same
GB2254820A (en) * 1991-04-16 1992-10-21 British Aerospace Tooling for composite component manufacture
ES2316212A1 (en) * 2006-01-17 2009-04-01 Flex Equipos De Descanso, S.A. Procedure for the manufacture of elastic bases, elastic bases as well obtained and mold employed for its manufacture. (Machine-translation by Google Translate, not legally binding)
WO2016055040A1 (en) * 2014-10-09 2016-04-14 Premium Aerotec Gmbh Mould tray for a tool for the production of a fibre composite component, and use of a mould tray of this type

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2552012A1 (en) * 1983-09-19 1985-03-22 Aerospatiale METHOD OF MANUFACTURING A MOLD FOR MAKING LARGE MOLDED PARTS MADE OF COMPOSITE MATERIAL, MOLD OBTAINED BY MEANS OF THIS PROCESS AND POLYMERIZED PART MADE BY MEANS OF THIS MOLD
EP0141700A1 (en) * 1983-09-19 1985-05-15 AEROSPATIALE Société Nationale Industrielle Mould for large mouldings of composite material
GB2172542A (en) * 1985-03-19 1986-09-24 Hazeldine Ind Group Limited Moulds
EP0341797A1 (en) * 1988-05-11 1989-11-15 Dsm N.V. Mould and process for the fabrication thereof
EP0351154A2 (en) * 1988-07-14 1990-01-17 Neste Oy Metal-coated plastic product mould and procedure for manufacturing the same
EP0351154A3 (en) * 1988-07-14 1991-04-24 Neste Oy Metal-coated plastic product mould and procedure for manufacturing the same
GB2254820A (en) * 1991-04-16 1992-10-21 British Aerospace Tooling for composite component manufacture
GB2254820B (en) * 1991-04-16 1995-04-19 British Aerospace Tooling for composite component manufacture
ES2316212A1 (en) * 2006-01-17 2009-04-01 Flex Equipos De Descanso, S.A. Procedure for the manufacture of elastic bases, elastic bases as well obtained and mold employed for its manufacture. (Machine-translation by Google Translate, not legally binding)
WO2016055040A1 (en) * 2014-10-09 2016-04-14 Premium Aerotec Gmbh Mould tray for a tool for the production of a fibre composite component, and use of a mould tray of this type

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)