WO2002014055A1 - Reinforced panel structure - Google Patents

Reinforced panel structure Download PDF

Info

Publication number
WO2002014055A1
WO2002014055A1 PCT/GB2001/003644 GB0103644W WO0214055A1 WO 2002014055 A1 WO2002014055 A1 WO 2002014055A1 GB 0103644 W GB0103644 W GB 0103644W WO 0214055 A1 WO0214055 A1 WO 0214055A1
Authority
WO
WIPO (PCT)
Prior art keywords
fabric
stitches
yarn
knitted
distance
Prior art date
Application number
PCT/GB2001/003644
Other languages
French (fr)
Inventor
David Muir Richmond
Michael Gervase Litton
Original Assignee
Scott & Fyfe Limited
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 Scott & Fyfe Limited filed Critical Scott & Fyfe Limited
Priority to AU2001278606A priority Critical patent/AU2001278606A1/en
Publication of WO2002014055A1 publication Critical patent/WO2002014055A1/en

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
    • 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
    • B29C70/04—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
    • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
    • B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
    • B29C70/22—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in at least two directions forming a two dimensional structure
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B21/00—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B21/02—Pile fabrics or articles having similar surface features
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2505/00—Industrial
    • D10B2505/02—Reinforcing materials; Prepregs

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Mechanical Engineering (AREA)
  • Knitting Of Fabric (AREA)

Abstract

A reinforced panel structure of the type comprising a mat of fabric material which is impregnated, for example within a two-part mould, with a curable resin or the like, and in which the fabric material comprises a knitted fabric. A knitted fabric can be relied upon to conform more reliably and predictably to particular mould shapes than the conventionally-used fabrics. Advantageously the knitted fabric has a fairly open structure in which the stitch length - the distance between the stitches when the yarn between stitches is substantially straight - is greater than the distance between the stitches. This may be achieved during manufacture of the knitted fabric by applying tension to the knitted fabric emerging from the knitting machine. In the preferred embodiment, the fabric is knitted on a double bed knitting machine.

Claims

11
1. A reinforced panel structure comprising a mat of fabric material which is impregnated during manufacture with a hardenable liquid material, the structure being characterised in that the fabric material is a knitted fabric.
2. A structure as claimed in claim 1 wherein the knitted fabric comprises a plurality of yarns knitted into an array of stitches in which the stitch length, being the distance between the stitches when the yarn between adjacent stitches is substantially straight, is greater than the distance between individual stitches to thus provide an open and conformable structure to the material.
3. A structure as claimed in claim 2 in which, during manufacture of the fabric, tension is applied to the knitted fabric, which tension is thereafter relaxed to provide the aforesaid structure in which the stitch length is greater than the distance between stitches.
4. A structure as claimed in either one of claims 2 or 3 wherein the yarn is a high-modulus yarn.
5. A structure as claimed in claim 4 wherein the yarn is glass fibre. 6. A structure as claimed in claim 4 wherein the yarn is polyester.
7. A structure as claimed in any one of claims 2 to 6 wherein yarns having different characteristics are knitted into selected areas of the fabric in order to provide different physical characteristics in such areas.
8. A structure as claimed in claim 7 wherein the selected areas are knitted with heavier yarns to provide local enhanced reinforcement.
9. A structure as claimed in any one of claims 2 to 6 wherein selected areas of the fabric are knitted with additional yarns to provide local enhanced reinforcement.
10. A structure as claimed in any one of claims 2 to 9 wherein the array of stitches is formed as two sub-arrays spaced apart from one another in a 12
direction transverse to the plane of the fabric.
11. A structure as claimed in claim 10 wherein the fabric is manufactured on a double bed knitting machine.
12. A method of manufacturing the knitted fabric included in the structure of claim 11 wherein the knitting machine comprises two parallel, spaced apart, rows of knitting needles and a plurality of bars, each operable to guide yarn to the knitting needles, and wherein the method is such that yarn from each of the bars is guided so as to knit alternately on a knitting needle of one row and then on a knitting needle of the other row. 137 A method as claimed as claim 12 in which, in between the formation of each stitch, the relative positions of the two rows of knitting needles is changed by an amount equal to a multiple of the distance between individual needles in each row so that the yarn is knit onto a needle occupying a different needle position to that of the previous stitch. 14. A method as claimed in claim 13 wherein the amount by which the relative positions of the two rows of needles changes between stitches is different, dependent upon which of said bars the particular yarn is guided from.
15. A method of making a reinforced panel structure, said method comprising impregnating a mat of fabric material with a hardenable liquid material and allowing the liquid material to harden, said method being characterised in that the fabric material is a knitted fabric.
16. A method as claimed in claim 15 wherein the impregnation of the mat of fabric material is carried out in a mould and wherein, prior to impregnation, the knitted fabric is placed within the mould in its natural unstressed state.
17. A method as claimed in claim 15 wherein the knitted fabric is tensioned in at least one direction prior to being impregnated with the hardenable liquid material. 18. A method as claimed in any one of claimsl 5-17 wherein the knitted 13
fabric comprises a plurality of yarns knitted into an array of stitches in which the stitch length, being the distance between the stitches when the yarn between adjacent stitches is substantially straight, is greater than the distance between individual stitches to thus provide an open and conformable structure to the material.
19. A method as claimed in claim 18 in which, during manufacture of the fabric, tension is applied to the knitted fabric, which tension is thereafter relaxed to provide the aforesaid structure in which the stitch length is greater than the distance between stitches. 20. A method as claimed in either one of claims 18 or 19 wherein the array of stitches is formed as two sub-arrays spaced apart from one another in a direction transverse to the plane of the fabric. 21. A method as claimed in claim 20 wherein the fabric is manufactured on a double bed knitting machine. 22. A method as claimed in claim 21 wherein the knitting machine comprises two parallel, spaced apart, rows of knitting needles and a plurality of bars, each operable to guide yarn to the knitting needles, and wherein the method is such that yarn from each of the bars is guided so as to knit alternately on a knitting needle of one row and then on a knitting needle of the other row.
23. A method as claimed as claim 22 in which, in between the formation of each stitch, the relative positions of the two rows of knitting needles is changed by an amount equal to a multiple of the distance between individual needles in each row so that the yarn is knit onto a needle occupying a different needle position to that of the previous stitch.
24. A method as claimed in claim 24 wherein the amount by which the relative positions of the two rows of needles changes between stitches is different, dependent upon which of said bars the particular yarn is guided from.
PCT/GB2001/003644 2000-08-16 2001-08-14 Reinforced panel structure WO2002014055A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001278606A AU2001278606A1 (en) 2000-08-16 2001-08-14 Reinforced panel structure

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0020216.8 2000-08-16
GB0020216A GB0020216D0 (en) 2000-08-16 2000-08-16 Reinforced panel structure

Publications (1)

Publication Number Publication Date
WO2002014055A1 true WO2002014055A1 (en) 2002-02-21

Family

ID=9897752

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2001/003644 WO2002014055A1 (en) 2000-08-16 2001-08-14 Reinforced panel structure

Country Status (3)

Country Link
AU (1) AU2001278606A1 (en)
GB (1) GB0020216D0 (en)
WO (1) WO2002014055A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110273223A (en) * 2019-07-02 2019-09-24 福建漳平协龙高新化纤有限公司 A kind of weaving method of warp-knitting jacquard screen cloth

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0243105A1 (en) * 1986-04-18 1987-10-28 Courtaulds Plc Composite element and reinforcement therefor
US4923724A (en) * 1986-04-23 1990-05-08 Courtaulds Plc Composite articles
DE4218860A1 (en) * 1992-06-09 1993-12-16 Chemnitz Textiltech Forsch Deeply embossed fabric - utilises a reserve of fibre in the form of loops to enable formations to be pressed into a sheet of material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0243105A1 (en) * 1986-04-18 1987-10-28 Courtaulds Plc Composite element and reinforcement therefor
US4923724A (en) * 1986-04-23 1990-05-08 Courtaulds Plc Composite articles
DE4218860A1 (en) * 1992-06-09 1993-12-16 Chemnitz Textiltech Forsch Deeply embossed fabric - utilises a reserve of fibre in the form of loops to enable formations to be pressed into a sheet of material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110273223A (en) * 2019-07-02 2019-09-24 福建漳平协龙高新化纤有限公司 A kind of weaving method of warp-knitting jacquard screen cloth

Also Published As

Publication number Publication date
AU2001278606A1 (en) 2002-02-25
GB0020216D0 (en) 2000-10-04

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