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WO2000056515A1 - Apparatus for facilitating extraction of supply conduits for thermosetting resin from a mould cavity - Google Patents

Apparatus for facilitating extraction of supply conduits for thermosetting resin from a mould cavity Download PDF

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Publication number
WO2000056515A1
WO2000056515A1 PCT/SE2000/000532 SE0000532W WO0056515A1 WO 2000056515 A1 WO2000056515 A1 WO 2000056515A1 SE 0000532 W SE0000532 W SE 0000532W WO 0056515 A1 WO0056515 A1 WO 0056515A1
Authority
WO
WIPO (PCT)
Prior art keywords
mould cavity
supply conduits
thermosetting resin
supply
reduction means
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/SE2000/000532
Other languages
French (fr)
Inventor
Dag Thulin
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 BRPI0009155-3A priority Critical patent/BR0009155B1/en
Priority to AU44420/00A priority patent/AU4442000A/en
Publication of WO2000056515A1 publication Critical patent/WO2000056515A1/en
Anticipated expiration legal-status Critical
Ceased 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
    • B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
    • B29C39/22—Component parts, details or accessories; Auxiliary operations
    • B29C39/24—Feeding the material into the mould
    • 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
    • B29C33/0061—Moulds or cores; Details thereof or accessories therefor characterised by the configuration of the material feeding channel
    • 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
    • B29C70/28—Shaping operations therefor
    • B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
    • B29C70/546—Measures for feeding or distributing the matrix material in the reinforcing structure

Definitions

  • the invention relates to an apparatus for facilitating extraction of supply conduits for thermosetting resin from a mould cavity being under vacuum and partly filled with reinforcing material for producing composite pipes , the mouths of said supply conduits are placed initially at the lowest end of the mould cavity and is then progressively moved upwards in a position just below the surface of the introduced resin .
  • a method for vacuum moulding of objects of thermosetting resin is known from SE-9002066-0 , in which the resin is supplied through at least one hose, which its sealingly inserted through a wall in the upper portion of the mould cavity sufficiently deep into the mould cavity so that its free end is positioned in the lower part of said cavity, and the hose or hoses are then progressively pulled upwards at such a speed that the free end of said hose or hoses is positioned just below the surface of the resin .
  • thermosetting resin through at least one supply conduit
  • said supply conduit for producing molecular friction in the thermosetting resin, which is transported through said supply conduit is an elongated, thin pipe or cannula of metal .
  • This apparatus is particularly used for producing composite pipes , which are made of a thin inner liner of metal , a sheath or intermediate load-carrying layer of reinforced thermosetting resin and possibly an external pipe of metal .
  • the liner of metal is first provided with a suitable reinforcement and to the desired thickness at the same time as a suitable number of supply conduits for the thermosetting resin are placed in the reinforcement, in such a way that the mouths of said supply conduits are placed in the lower part of the ready mould.
  • the inner liner and the reinforcement is then provided externally with a closing mould part in the form of an elastic or rigid mould part or an external pipe . Vacuum is then applied and the supply of thermosetting resin through the supply conduits is started, whereupon said supply conduits are pulled out of the mould at such a speed that the mouths of said supply conduits are placed just below the surface of the rising resin.
  • the supply conduits used have an external diameter of 1-3 mm and a wall thickness of 0,2-0,5 mm and a tensile strength of 900 kN.
  • the object of the invention is to eliminate the above-mentioned drawbacks .
  • this object is achieved in that a friction-reduction means is arranged around each supply conduit.
  • a friction reduction means 1 is made as a thin, elongated stripe or foil, which is folded in the middle of the longitudinal direction of the stripe for producing a V-shaped stripe with two stripe halves 2 , 3 between which a supply conduit 4 is placed.
  • the stripe halves 2 , 3 has such a width that they completely cover the supply conduit 4 when they are folded against each other .
  • the friction reduction means 1 shall be made of a substance soluble in the thermosetting resin used, which is supplied by means of said supply conduits, so that no foreign substances , layers or marks from the friction re- duction means will appear in the finished laminate of the composite pipes .
  • the surfaces of the stripe halves 2 , 3 which are directed towards the supply conduit can be provided with a lubricating substance, such as e.g. wax, in order to further reduce the friction between the supply conduit 4 and the stripe 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)
  • Moulding By Coating Moulds (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

The invention relates to an apparatus for facilitating extraction of supply conduits (4) for thermosetting resin from a mould cavity being under vacuum and partly filled with reinforcing material for producing composite pipes, the mouths of said supply conduits are placed initially at the lowest part of said mould cavity and is then progressively moved upwards in a position just below the surface of the introduced resin. To be able to extract the supply conduits from the mould cavity it is suggested according to the invention that a friction reduction means (1) is placed around each supply conduit (4).

Description

APPARATUS FOR FACILITATING EXTRACTION OF SUPPLY CONDUITS FOR THERMOSETTING RESIN FROM A MOULD CAVITY
The invention relates to an apparatus for facilitating extraction of supply conduits for thermosetting resin from a mould cavity being under vacuum and partly filled with reinforcing material for producing composite pipes , the mouths of said supply conduits are placed initially at the lowest end of the mould cavity and is then progressively moved upwards in a position just below the surface of the introduced resin .
A method for vacuum moulding of objects of thermosetting resin is known from SE-9002066-0 , in which the resin is supplied through at least one hose, which its sealingly inserted through a wall in the upper portion of the mould cavity sufficiently deep into the mould cavity so that its free end is positioned in the lower part of said cavity, and the hose or hoses are then progressively pulled upwards at such a speed that the free end of said hose or hoses is positioned just below the surface of the resin .
An apparatus for supplying thermosetting resin through at least one supply conduit is known from PCT/SE96/01057 , said supply conduit for producing molecular friction in the thermosetting resin, which is transported through said supply conduit, is an elongated, thin pipe or cannula of metal .
This apparatus is particularly used for producing composite pipes , which are made of a thin inner liner of metal , a sheath or intermediate load-carrying layer of reinforced thermosetting resin and possibly an external pipe of metal . When producing such composite pipes with a length of up to 12 metres and a thickness of material of about 3-30 mm the liner of metal is first provided with a suitable reinforcement and to the desired thickness at the same time as a suitable number of supply conduits for the thermosetting resin are placed in the reinforcement, in such a way that the mouths of said supply conduits are placed in the lower part of the ready mould. The inner liner and the reinforcement is then provided externally with a closing mould part in the form of an elastic or rigid mould part or an external pipe . Vacuum is then applied and the supply of thermosetting resin through the supply conduits is started, whereupon said supply conduits are pulled out of the mould at such a speed that the mouths of said supply conduits are placed just below the surface of the rising resin.
There is now a need for producing such composite pipes with a length of up to about 40 metres. However, when producing such long pipes by means of the above de- scribed supply conduits the friction between said conduits and the reinforcement will be too large. Simply, it is not possible to extract the supply conduits without breaking the same . The supply conduits used have an external diameter of 1-3 mm and a wall thickness of 0,2-0,5 mm and a tensile strength of 900 kN.
Increasing the wall thickness of the supply conduits while maintaining the same inner diameter will lead to that the external diameter has to be increased. This is not an acceptable solution, since ridges and cavities will then appear in the reinforcement after the supply conduits , which in the ready-made composite pipe will be filled with thermosetting resin. The object of the invention is to eliminate the above-mentioned drawbacks .
According to the invention this object is achieved in that a friction-reduction means is arranged around each supply conduit.
The invention will now be described in more detail with reference to the attached drawing, which is a broken perspective view of the friction reduction means according to the invention together with a supply conduit. Preferably, a friction reduction means 1 is made as a thin, elongated stripe or foil, which is folded in the middle of the longitudinal direction of the stripe for producing a V-shaped stripe with two stripe halves 2 , 3 between which a supply conduit 4 is placed. The stripe halves 2 , 3 has such a width that they completely cover the supply conduit 4 when they are folded against each other . When producing composite pipes with a length of up to about 40 metres the supply conduits 4 together with friction reduction means 1 are placed in the reinforcement in the same way as described above .
The friction reduction means 1 shall be made of a substance soluble in the thermosetting resin used, which is supplied by means of said supply conduits, so that no foreign substances , layers or marks from the friction re- duction means will appear in the finished laminate of the composite pipes . The surfaces of the stripe halves 2 , 3 which are directed towards the supply conduit can be provided with a lubricating substance, such as e.g. wax, in order to further reduce the friction between the supply conduit 4 and the stripe 1.
By arranging such friction reduction means 1 around each supply conduit within the mould it is now possible to produce composite pipes with a length of up to 40 metres by means of thin, elongated supply conduits and without ridges or cavities being formed in the reinforcement of the finished composite pipe .

Claims

C l a i m s
1. Apparatus for facilitating extracting of supply con- duits (4) for thermosetting resin from a mould cavity being under vaccum and partly filled with reinforcing material for producing composite pipes , the mouths of said supply conduits are placed initially at the lowest part of said mould cavity and is then progressively moved upwards in a position just below the surface of the introduced resin, c h a r a c t e r i z e d i n that a friction reduction means (1) is placed around each supply conduit (4) .
2. Apparatus according to Claim 1, c h a r a c t e r i z e d i n that the friction reduction means (1) is made of a substance which is soluble in the thermosetting resin used.
3. Apparatus according to Claim 1 or 2 , c h a r a c t e r i z e d i n that the surface of the friction reduction means (1) , which is directed against the supply conduit (4) , is proveded with a lubricating substance.
PCT/SE2000/000532 1999-03-19 2000-03-17 Apparatus for facilitating extraction of supply conduits for thermosetting resin from a mould cavity Ceased WO2000056515A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BRPI0009155-3A BR0009155B1 (en) 1999-03-19 2000-03-17 device for facilitating the extraction of thermosetting resin supply ducts from a molded cavity.
AU44420/00A AU4442000A (en) 1999-03-19 2000-03-17 Apparatus for facilitating extraction of supply conduits for thermosetting resinfrom a mould cavity

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9901004A SE513772C2 (en) 1999-03-19 1999-03-19 Device for facilitating the extraction of supply cables for thermosetting plastic from mold spaces
SE9901004-3 1999-03-19

Publications (1)

Publication Number Publication Date
WO2000056515A1 true WO2000056515A1 (en) 2000-09-28

Family

ID=20414920

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2000/000532 Ceased WO2000056515A1 (en) 1999-03-19 2000-03-17 Apparatus for facilitating extraction of supply conduits for thermosetting resin from a mould cavity

Country Status (4)

Country Link
AU (1) AU4442000A (en)
BR (1) BR0009155B1 (en)
SE (1) SE513772C2 (en)
WO (1) WO2000056515A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE347901B (en) * 1970-08-31 1972-08-21 Control Building Syst Inc
EP0517416A1 (en) * 1991-06-01 1992-12-09 British Aerospace Public Limited Company Resin flow in the manufacture of fibre reinforced composite structures
JPH06155491A (en) * 1992-11-25 1994-06-03 Mitsubishi Electric Corp Casting mold
WO1994019176A1 (en) * 1993-02-25 1994-09-01 Swedish Institute Of Composites, Sicomp Method for manufacturing fibre composites
WO1997007954A1 (en) * 1995-08-31 1997-03-06 Dag Thulin Apparatus for supplying thermosetting resin through conduits into a mould cavity being under vacuum

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE347901B (en) * 1970-08-31 1972-08-21 Control Building Syst Inc
EP0517416A1 (en) * 1991-06-01 1992-12-09 British Aerospace Public Limited Company Resin flow in the manufacture of fibre reinforced composite structures
JPH06155491A (en) * 1992-11-25 1994-06-03 Mitsubishi Electric Corp Casting mold
WO1994019176A1 (en) * 1993-02-25 1994-09-01 Swedish Institute Of Composites, Sicomp Method for manufacturing fibre composites
WO1997007954A1 (en) * 1995-08-31 1997-03-06 Dag Thulin Apparatus for supplying thermosetting resin through conduits into a mould cavity being under vacuum

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 199427, Derwent World Patents Index; AN 1994-221127 *
PATENT ABSTRACTS OF JAPAN *

Also Published As

Publication number Publication date
SE9901004L (en) 2000-09-20
AU4442000A (en) 2000-10-09
SE513772C2 (en) 2000-11-06
BR0009155A (en) 2001-12-26
SE9901004D0 (en) 1999-03-19
BR0009155B1 (en) 2013-05-07

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