WO1991000171A1 - Zone stiffened composites, with two different resins - Google Patents

Zone stiffened composites, with two different resins Download PDF

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Publication number
WO1991000171A1
WO1991000171A1 PCT/GB1990/001014 GB9001014W WO9100171A1 WO 1991000171 A1 WO1991000171 A1 WO 1991000171A1 GB 9001014 W GB9001014 W GB 9001014W WO 9100171 A1 WO9100171 A1 WO 9100171A1
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WO
WIPO (PCT)
Prior art keywords
membrane
matrix
injected
volume
matrix material
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.)
Ceased
Application number
PCT/GB1990/001014
Other languages
French (fr)
Inventor
John Newton
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.)
3D Composites Ltd
Original Assignee
3D Composites 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 3D Composites Ltd filed Critical 3D Composites Ltd
Priority to BR909007503A priority Critical patent/BR9007503A/en
Priority to DE69021063T priority patent/DE69021063T2/en
Priority to EP90917797A priority patent/EP0481015B1/en
Priority to US07/784,410 priority patent/US5344601A/en
Publication of WO1991000171A1 publication Critical patent/WO1991000171A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B29D99/00—Subject matter not provided for in other groups of this subclass
    • B29D99/001—Producing wall or panel-like structures, e.g. for hulls, fuselages, or buildings
    • 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
    • B29C44/04—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 consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B29C44/0461—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 consisting of at least two parts of chemically or physically different materials, e.g. having different densities by having different chemical compositions in different places, e.g. having different concentrations of foaming agent, feeding one composition after the other
    • B29C44/0469—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 consisting of at least two parts of chemically or physically different materials, e.g. having different densities by having different chemical compositions in different places, e.g. having different concentrations of foaming agent, feeding one composition after the other provided with physical separators between the different materials, e.g. separating layers, mould walls
    • 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
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B29C70/08—Fibrous reinforcements only comprising combinations of different forms of fibrous reinforcements incorporated in matrix material, forming one or more layers, and with or without non-reinforced layers
    • 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
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B29C70/08—Fibrous reinforcements only comprising combinations of different forms of fibrous reinforcements incorporated in matrix material, forming one or more layers, and with or without non-reinforced layers
    • B29C70/086—Fibrous reinforcements only comprising combinations of different forms of fibrous reinforcements incorporated in matrix material, forming one or more layers, and with or without non-reinforced layers and with one or more layers of pure plastics material, e.g. foam layers
    • 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
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
    • B29C70/48—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM], e.g. by vacuum
    • 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
    • B29C70/86—Incorporated in coherent impregnated reinforcing layers, e.g. by winding
    • B29C70/865—Incorporated in coherent impregnated reinforcing layers, e.g. by winding completely encapsulated

Definitions

  • This invention relates to a method of moulding and in particular to a method of moulding fibre-reinforced resin composite materials.
  • Products and components made from high strength composites consisting of reinforcing fibres bonded in a matrix material system -such as synthetic resin are continually finding new applications as their strength-to-weight advantages are realised and exploited.
  • a matrix material system such as synthetic resin
  • Secondary coating processes, such as in-mould coating can be used but in general these are restricted to thin coatings and they always complicate the production process and therefore add cost.
  • An example of such a product is an access chamber cover of the type described in European Patent No 1047050.
  • this type of cover to be suitable for use in the highway it must have a top surface of sufficient thickness to contain a tread pattern and this surface must have exceptional wear and high friction properties .
  • Such a surface coating requires the use of special resins in conjunction with the inclusion of aggregates, and it is very difficult to apply the secondary coating.
  • the method of the invention seeks to provide an improved manufacturing process which will allow the injection of two or more matrix material systems within a single moulding cycle of a component.
  • Each matrix material system may, independently, have the ability to incorporate fibre reinforcement, aggregates, various fillers and the like.
  • a method of moulding a composite article which comprises providing a mould adapted to receive a first matrix component for moulding the article, inserting a membrane in the mould so as to define at least two contiguous volumes seperated thereby, injecting the first matrix system one side of the said membrane and injecting a second matrix system on the other side of the membrane.
  • the first matrix system has the characteristics required for the surface and, in effect, provides the surface coating on the finished composite article. It will preferably be a curable resin system and may contain fibre reinforcement, aggregates, various fillers and the like to give the necessary wear and surface friction properties.
  • the membrane acts as a boundry between the two volumes and allows injection of one matrix material system into the chosen volume confining it to that predetermined volume within the mould.
  • the second matrix material may be injected into the other contiguous volume and the membrane is preferably adapted to allow one of the matrix systems to diffuse into the other so as to fuse, chemically combine or otherwise bond prior to or as part of the curing process for the article.
  • the second matrix system may be a curable plastics resin system as used in our above mentioned European patent .
  • the matrix component may be a cloth or batt of fibres, e.g. glass fibres, and may contain one or more foam inserts.
  • a membrane suitable for use on the method of the invention may be made in a number of different ways and the most suitable membrane will depend on the product and matrix material systems employed. Examples of suitable membrane systems are described below.
  • a membrane is formed from a woven, knitted or non-woven fabric with pore sizes of a predetermined value intended for use with matrix material systems of different viscosities.
  • One volume can be injected with higher viscosity material which would be contained by the membrane after which the second volume is injected with the lower viscosity material which would penetrate the membrane and come into direct contact with the first material.
  • a membrane similar to that in paragraph 1 above maybe be coated and hence sealed with a thin film of material but the membrane or coating is dissolved by the second matrix material injected, thereby allowing direct contact between the two matrix materials.
  • a membrane may be made from a pre- impregnated reinforement material normally used in the moulding system, such as a resin impregnated glass fibre cloth or batt, which on contact with the injected matrix materials integrates with them and proceeds to cure as part of the curing process.
  • a pre- impregnated reinforement material normally used in the moulding system, such as a resin impregnated glass fibre cloth or batt, which on contact with the injected matrix materials integrates with them and proceeds to cure as part of the curing process.
  • a membrane may be made from a fabric such that the first matrix material system coming into contact with one side of the fabric has the effect of "blinding" the fabric and hence blocking the matrix material from penetrating through it.
  • the second matrix material injected from the opposite side can penetrate the membrane and make direct contact with the first injected material.
  • Figure 1 is a sectional view of a mould for producing a manhole cover of the type described in European Patent No 1047050;
  • Figure 2 is a similar view to figure 1 after injection has been completed.
  • a mould generally designated (10) is illustrated for producing a manhole cover suitable for highway installation which will therefore have an upper surface portion of- sufficient thickness to contain a tread pattern which will also have exceptional wear properties and high friction properties.
  • the basic product comprises foam insert (12) about which reinforcing fibres (14) are arranged.
  • the central gallery (16) gives access to the upper and lower fibre layers and a nozzle (5) is inserted directly into the gallery (16) to inject a matrix system, in this case a curable synthetic resin, into the fibres (14) whereby to produce the composite manhole cover.
  • a matrix system in this case a curable synthetic resin
  • a membrane (3) is provided above the upper layer of fibres (14) effectively dividing the interior mould space into two volumes (1) and (2) respectively.
  • the nozzle (5) as already described, penetrates into the gallery (16) in the volume (2) passing through the membrane (3) and being arranged to sealingly engage with it.
  • a second nozzle (4) is provided communicating with the volume (1) .
  • the matrix material systems of the surface layer may be injected in a precise quantity, through the nozzle (4) into volume (1) .
  • the air in volume (1) would then escape through the membrane into volume (2) and out to atmosphere through vents (6) .
  • the matrix material would be confined in volume(l) by the membrane (3) .
  • An even hydraulic pressure would be applied onto the membrane by the matrix material thus applying an even pressure onto the fibres (14) and foam core (12) of the basic composite structure. This could be arranged to force the structure to occupy its designed volume.
  • the resin employed as the second matrix material system for the volume (2) would be injected through nozzle (5) .
  • the air in the volume 2 would vent via the vents (6) once again.
  • volume (2) For thin surface coatings it may prove beneficial to inject volume (2) first and allow the injection into volume (1) to force excess matrix material from volume (2) out through the vent (6). It is preferable to inject volumes (1 & 2) from the same side of the mould as this simplifies the moulding equipment required. If there were more than two, for example three, volumes then penetration of a nozzle through one volume and a membrane may prove the only method of injection possible.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Composite Materials (AREA)
  • Chemical & Material Sciences (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Architecture (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulding By Coating Moulds (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Laminated Bodies (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Reinforced Plastic Materials (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

A method of moulding a composite article which comprises providing a mould adapted to receive a first matrix component for moulding the article, inserting a membrane (3) in the mould so as to define at least two contiguous volumes (1, 2) separated thereby, injecting a first component system on one side of the said membrane and injecting a second matrix system on the other side of the membrane and curing the system. Preferably the membrane is arranged to allow the two matrix systems to partially diffuse into one another before curing to give a bond between the two.

Description

Zone stiffened composites, with two different resins,
This invention relates to a method of moulding and in particular to a method of moulding fibre-reinforced resin composite materials.
Products and components made from high strength composites consisting of reinforcing fibres bonded in a matrix material system -such as synthetic resin are continually finding new applications as their strength-to-weight advantages are realised and exploited. However, there are certain applications where the surface properties of the product cannot be achieved by the matrix . material system employed in forming the component. Secondary coating processes, such as in-mould coating, can be used but in general these are restricted to thin coatings and they always complicate the production process and therefore add cost.
An example of such a product is an access chamber cover of the type described in European Patent No 1047050. For this type of cover to be suitable for use in the highway it must have a top surface of sufficient thickness to contain a tread pattern and this surface must have exceptional wear and high friction properties . Such a surface coating requires the use of special resins in conjunction with the inclusion of aggregates, and it is very difficult to apply the secondary coating.
The method of the invention seeks to provide an improved manufacturing process which will allow the injection of two or more matrix material systems within a single moulding cycle of a component. Each matrix material system may, independently, have the ability to incorporate fibre reinforcement, aggregates, various fillers and the like.
According to the present invention there is provided a method of moulding a composite article which comprises providing a mould adapted to receive a first matrix component for moulding the article, inserting a membrane in the mould so as to define at least two contiguous volumes seperated thereby, injecting the first matrix system one side of the said membrane and injecting a second matrix system on the other side of the membrane.
Preferably the first matrix system has the characteristics required for the surface and, in effect, provides the surface coating on the finished composite article. It will preferably be a curable resin system and may contain fibre reinforcement, aggregates, various fillers and the like to give the necessary wear and surface friction properties.
The membrane acts as a boundry between the two volumes and allows injection of one matrix material system into the chosen volume confining it to that predetermined volume within the mould. The second matrix material may be injected into the other contiguous volume and the membrane is preferably adapted to allow one of the matrix systems to diffuse into the other so as to fuse, chemically combine or otherwise bond prior to or as part of the curing process for the article. The second matrix system may be a curable plastics resin system as used in our above mentioned European patent . The matrix component may be a cloth or batt of fibres, e.g. glass fibres, and may contain one or more foam inserts.
A membrane suitable for use on the method of the invention may be made in a number of different ways and the most suitable membrane will depend on the product and matrix material systems employed. Examples of suitable membrane systems are described below.
1) A membrane is formed from a woven, knitted or non-woven fabric with pore sizes of a predetermined value intended for use with matrix material systems of different viscosities. One volume can be injected with higher viscosity material which would be contained by the membrane after which the second volume is injected with the lower viscosity material which would penetrate the membrane and come into direct contact with the first material.
2) A membrane similar to that in paragraph 1 above maybe be coated and hence sealed with a thin film of material but the membrane or coating is dissolved by the second matrix material injected, thereby allowing direct contact between the two matrix materials.
3) A membrane may be made from a pre- impregnated reinforement material normally used in the moulding system, such as a resin impregnated glass fibre cloth or batt, which on contact with the injected matrix materials integrates with them and proceeds to cure as part of the curing process.
4) A membrane may be made from a fabric such that the first matrix material system coming into contact with one side of the fabric has the effect of "blinding" the fabric and hence blocking the matrix material from penetrating through it. The second matrix material injected from the opposite side can penetrate the membrane and make direct contact with the first injected material.
Naturally other forms of membrane could be employed as could combinations of the forms described above.
The invention will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a sectional view of a mould for producing a manhole cover of the type described in European Patent No 1047050; and
Figure 2 is a similar view to figure 1 after injection has been completed.
Referring to the drawings, a mould generally designated (10) is illustrated for producing a manhole cover suitable for highway installation which will therefore have an upper surface portion of- sufficient thickness to contain a tread pattern which will also have exceptional wear properties and high friction properties. As described in our PCT publication no. D89/00495 the basic product comprises foam insert (12) about which reinforcing fibres (14) are arranged. The central gallery (16) gives access to the upper and lower fibre layers and a nozzle (5) is inserted directly into the gallery (16) to inject a matrix system, in this case a curable synthetic resin, into the fibres (14) whereby to produce the composite manhole cover. The cover is more fully described in our above mentioned European Patent, and in our PCT patent publication no. O89/00495.
As modified in accordance with the method of the present invention, a membrane (3) is provided above the upper layer of fibres (14) effectively dividing the interior mould space into two volumes (1) and (2) respectively. The nozzle (5) , as already described, penetrates into the gallery (16) in the volume (2) passing through the membrane (3) and being arranged to sealingly engage with it. A second nozzle (4) is provided communicating with the volume (1) .
In operation, the matrix material systems of the surface layer may be injected in a precise quantity, through the nozzle (4) into volume (1) . The air in volume (1) would then escape through the membrane into volume (2) and out to atmosphere through vents (6) . The matrix material would be confined in volume(l) by the membrane (3) . An even hydraulic pressure would be applied onto the membrane by the matrix material thus applying an even pressure onto the fibres (14) and foam core (12) of the basic composite structure. This could be arranged to force the structure to occupy its designed volume. The resin employed as the second matrix material system for the volume (2) would be injected through nozzle (5) . The air in the volume 2 would vent via the vents (6) once again. On completion of the injection cycle nozzles (4 & 5) are withdrawn and the holes plugged with plugs (18), (20) (as illustrated in figure 2) after which the resin systems within the mould are cured or allowed to cure. On completion of the curing process of the two matrix systems, the component would be demoulded.
For thin surface coatings it may prove beneficial to inject volume (2) first and allow the injection into volume (1) to force excess matrix material from volume (2) out through the vent (6). It is preferable to inject volumes (1 & 2) from the same side of the mould as this simplifies the moulding equipment required. If there were more than two, for example three, volumes then penetration of a nozzle through one volume and a membrane may prove the only method of injection possible.
It will be appreciated that other combinations of injection sequences may be employed to suit individual circumstances.
The method of this invention, especially when combined with the direct injection system described in our PCT patent publication no. WO89/00495 provides an exceptionally versatile process for the manufacture of advanced complex composite components for diverse applications.

Claims

1. A method of moulding a composite article which comprises providing a mould adapted to receive a first matrix component for moulding the article, inserting a membrane in the mould so as to define at least two contiguous volumes separated thereby, injecting a first matrix system on one side of the said membrane and injecting a second matrix system on the other side of the membrane and curing the system.
2. A method as claimed in claim 1 in which the first matrix system has the characteristics required for the surface and provides a surface coating on the finished composite article.
3. A method as claimed in either of claims 1 or 2 in which the membrane acts as a boundry between the two volumes .
4. A method as claimed in claim 3 in which the membrane is adapted to allow one of the matrix systems to diffuse into the other so as to fuse, chemically combine or otherwise bond prior to or as part of the curing process for the article.
5. A method as claimed in any of claims 1 to 4 in which the membrane is formed from a woven, knitted or non-woven fabric with pore sizes of a predetermined value intended for use with matrix material systems of different viscosities, one volume is injected with higher viscosity material which is contained by the membrane after which the second volume is injected with the lower viscosity material which penetrates the membrane and comes into direct contact with the first material.
6. A method as claimed in any of claims 1 to 4 in which the membrane is formed from a woven, knitted or non-woven fabric which is coated and hence sealed with a thin film of material, the coating being dissolved by the second matrix material injected, thereby allowing direct contact between the two matrix materials.
7. A method as claimed in any of claims 1 to 4 in which the membrane is made from a pre-impregnated reinforement material normally used in the moulding system, which on contact with the injected matrix materials integrates with them and proceeds to cure as part of the curing process .
8. A method as claimed in claim 7 in which the material is a resin impregnated glass fibre cloth or batt.
9. A method as claimed in any of claims 1 to 4 in which the membrane is made from a fabric such that the first matrix material system coming into contact with one side of the fabric has the effect of "blinding" the fabric and hence blocking the matrix material from penetrating through it, and the second matrix material injected from the opposite side penetrates the membrane and makes direct contact with the first injected material.
10. A method as claimed in any of claims 1 to 9 in which the matrix material is injected into one volume by means of a nozzle passing through the mould into that volume, and the matrix material is injected into the other volume or volumes by another nozzle passing through the first volume and the membrane.
11. A method as claimed in claim 10 in which the said another nozzle sealingly engages with the membrane as it passes therethrough.
12. A method as claimed in any of claims 1 to 11 in which each matrix system is a curable plastics material resin system, which may incorporate fillers or reinforcement.
PCT/GB1990/001014 1989-07-04 1990-07-02 Zone stiffened composites, with two different resins Ceased WO1991000171A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BR909007503A BR9007503A (en) 1989-07-04 1990-07-02 MOLDING PROCESS OF A COMPOSITE ARTICLE
DE69021063T DE69021063T2 (en) 1989-07-04 1990-07-02 ZONED COMPOSITES WITH TWO DIFFERENT RESINS.
EP90917797A EP0481015B1 (en) 1989-07-04 1990-07-02 Zone stiffened composites, with two different resins
US07/784,410 US5344601A (en) 1989-07-04 1990-07-02 Molding method using two different resins and a membrane

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB898915369A GB8915369D0 (en) 1989-07-04 1989-07-04 Moulding method
GB8915369.6 1989-07-04

Publications (1)

Publication Number Publication Date
WO1991000171A1 true WO1991000171A1 (en) 1991-01-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1990/001014 Ceased WO1991000171A1 (en) 1989-07-04 1990-07-02 Zone stiffened composites, with two different resins

Country Status (11)

Country Link
US (1) US5344601A (en)
EP (1) EP0481015B1 (en)
JP (1) JPH05500642A (en)
AT (1) ATE125198T1 (en)
BR (1) BR9007503A (en)
CA (1) CA2063254A1 (en)
DE (1) DE69021063T2 (en)
DK (1) DK0481015T3 (en)
ES (1) ES2020487A6 (en)
GB (1) GB8915369D0 (en)
WO (1) WO1991000171A1 (en)

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WO1994026505A1 (en) * 1993-05-14 1994-11-24 Imperial Chemical Industries Plc Reinforced moulded articles and method of producing same
FR2740383A1 (en) * 1995-10-27 1997-04-30 Aerospatiale METHOD FOR MANUFACTURING A COMPOSITE MATERIAL PANEL WITH RESIN TRANSFER MOLDING
GB2306910A (en) * 1995-11-13 1997-05-14 Stanton Rubber & Plastics Ltd Moulding articles having regions of differing hardness
US5698266A (en) * 1993-04-05 1997-12-16 Commissariat A L'energie Atomique Process for the production of thin coatings having optical and abrasion resistance properties
US8321985B2 (en) 2010-07-05 2012-12-04 John Reginald Newton Support platform and method of construction thereof

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US6113827A (en) 1996-11-05 2000-09-05 Styczynski; Robert J. Method for molding and curing silicone
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US6168735B1 (en) * 1998-05-07 2001-01-02 Ford Global Technologies, Inc. Method of making a foam core article
US6348169B1 (en) 1999-04-28 2002-02-19 Cadillac Products, Inc. Method of making a dual durometer water shield
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US20020124851A1 (en) * 2000-11-28 2002-09-12 Richard Knauer Hearing protective device and method of making same
GB0112139D0 (en) * 2001-05-18 2001-07-11 3 D Composites Ltd Anti slip surface
US7257520B2 (en) * 2004-04-30 2007-08-14 Omnova Solutions, Inc. Method and system for in-mold coating flow simulation
ATE458870T1 (en) * 2005-08-19 2010-03-15 Tb Composites Ltd COMPOSITE CONSTRUCTION AND MANUFACTURING METHOD THEREOF
US7740679B2 (en) * 2006-04-18 2010-06-22 Baldwin Filters, Inc. Air filter element with composite molded end cap
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EP0481015B1 (en) 1995-07-19
DE69021063D1 (en) 1995-08-24
EP0481015A1 (en) 1992-04-22
ES2020487A6 (en) 1991-08-01
GB8915369D0 (en) 1989-08-23
DE69021063T2 (en) 1995-12-14
US5344601A (en) 1994-09-06
JPH05500642A (en) 1993-02-12
DK0481015T3 (en) 1995-09-04
BR9007503A (en) 1992-06-23
ATE125198T1 (en) 1995-08-15
CA2063254A1 (en) 1991-01-05

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