GB2143768A - The manufacture of structural profile - Google Patents

The manufacture of structural profile Download PDF

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Publication number
GB2143768A
GB2143768A GB08416253A GB8416253A GB2143768A GB 2143768 A GB2143768 A GB 2143768A GB 08416253 A GB08416253 A GB 08416253A GB 8416253 A GB8416253 A GB 8416253A GB 2143768 A GB2143768 A GB 2143768A
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GB
United Kingdom
Prior art keywords
core
filler
structural profile
resin
fibres
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.)
Granted
Application number
GB08416253A
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GB8416253D0 (en
GB2143768B (en
Inventor
Michael John Hewitt
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
Priority claimed from GB838318124A external-priority patent/GB8318124D0/en
Application filed by Individual filed Critical Individual
Priority to GB08416253A priority Critical patent/GB2143768B/en
Publication of GB8416253D0 publication Critical patent/GB8416253D0/en
Publication of GB2143768A publication Critical patent/GB2143768A/en
Application granted granted Critical
Publication of GB2143768B publication Critical patent/GB2143768B/en
Expired legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
    • E06B3/04—Wing frames not characterised by the manner of movement
    • E06B3/06—Single frames
    • E06B3/08—Constructions depending on the use of specified materials
    • E06B3/20—Constructions depending on the use of specified materials of plastics
    • E06B3/205—Constructions depending on the use of specified materials of plastics moulded or extruded around a core
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/06—Rod-shaped
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/154—Coating solid articles, i.e. non-hollow 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/304—Extrusion nozzles or dies specially adapted for bringing together components, e.g. melts within the die
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/355—Conveyors for extruded articles
    • 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
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
    • 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
    • B29K2503/00—Use of resin-bonded materials as filler
    • 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
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3462—Cables

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

Extruded structural profile for use as a timber substitute comprises a core 10 of closeley compacted, resin-bonded, lightweight particulate filler. The core 10 is sheathed with resin-bonded glass fibre 14 and an acrylic plastics coating 12. In manufacture, the core constituents are mixed in a through feed mixer 16 and fed successively to an extruder 18 and through a first die 20 which forms the core 10. Resin-soaked glass fibre rovings 22 are introduced into the die 20 and laid in the direction of extrusion on to outer surfaces of the core. The sheathed core proceeds through a second die 26 to receive its acrylic coating 12 from an extruder associated with a third die 28. The profile is cured as it passes through an R.F. heater 30. The extrusion process is assisted by pulling mechanism 44 which draws the fibre-sheathed core. <IMAGE>

Description

SPECIFICATION The manufacture of structural profile This invention is concerned with the manufacture of structural profile, particularly for the provision of structural members suitable for use in the building or joinery industries (as a substitute for the traditional use of timber).
There is described in my U.K. patent application No. 8228819(2 107 772 A) the manufacture of extruded structural profile which may be used as a timber substitute. Such profile is of a kind (hereinafter referred to as the kind defined) comprising a core which comprises closely compacted, resinbonded, lightweight particulate filler, the profile exhibiting a high degree of dimensional and shape stability, possessing adequate strength to bear the loads encountered by, for example, window and door frames, and preferably possessing good screw-holding properties. The proportion of resin present may be relatively low and the core accordingly formed in a semi-dry condition.
In specification No. 2 107 772 A there is described a particular form of structural profile of the kind defined comprising a plastics sheathed core in which the core comprises an unsaturated polyester resin incorporating a silicate filler and an additional mineral filler. Said specification also describes a method of manufacture comprising the steps of thoroughly mixing and compacting together the constituents of the core, extruding the core through an appropriately shaped die, extruding a sheath of plastics material comprising an acrylic coating around the core, and curing the sheathed core by means of heat so as to effect curing of the core and cross-linking between the core and the sheath.It is proposed therein to use, if desired, reinforcing filaments comprising glass rovings extending lengthwise of the profile and arranged in one or more layers in the core, the glass rovings being introduced into the die arrangement of the extrusion machine and drawn in as a consequence of the extrusion process.
As hereinbefore referred to, it can be that the core of structural profile of the kind defined is formed in a semi-dry condition, the proportion of resin being relatively low. Keeping the proportion of resin low can be valuable both in keeping down the cost of the constituent materials of the core and in ensuring a high degree of shape stability for the core during formation.
However, it has been found that in extruding such material through a die, problems can arise from high back pressure developed in the die.
Such high back-pressure can result not only in a high power input requirement for extrusion of the core at a satisfactory rate, but can also result in there being an unacceptably high wear rate, and consequently a short working life, for the die and other parts of the apparatus. Even where the core is formed in a more moist condition, it is generally desirable to keep the back pressure in the die to a minimum.
Furthermore, a kind of core filler may be pre ferred, not least for the weight advantage it can give, which provides cavities which will remain unfilled by resin. Such a filler is for simplicity referred to hereinafter as a cellular filler. One example of a cellular filler which may be used is a silicate filler in the form of hollow microspheres (as referred to in patent specification No. 2 107 772 A) but, for example, suitable rigid inorganic foam materials, in a particulate form, might also be used.-A problem which can arise with cellular fillers is that of breakdown of the filler by crushing from excessive pressures.Such crushing of the filler can lead not only to there being an increased proportion of resin present in the finished core (affecting, not least, the specific gravity of the product), but may also result in the core having certain other altered physical characteristics.
Accordingly it is an object of the present invention to provide an improved method of manufacturing structural profile of the kind defined, with a view to reducing the build-up of back pressure in the die arrangement, with a consequent decrease of wear in the apparatus generally and the minimising of any breakdown of cellular filler (when used).
The invention provides, in one of its aspects, a method of manufacturing structural profile of the kind defined in which in passage of the profile through a shaping die a pulling force is exerted in the direction of extrusion on reinforcing fibres covering outer surfaces of the core.
I have found that by the provision of the reinforcing fibres on outer surfaces of the core, and by pulling those fibres during extrusion, the back pressure developed can be markedly reduced and the whole extrusion process significantly eased.
It is also an object of the present invention to provide improved structural profile of the kind defined, and in accordance with the invention in another of its aspects such profile comprises a core which is sheathed by resin-bonded reinforcing fibres bonded to the core.
As is described in patent specification No. 2 107 772 A, for example, it has been usual in the past for the profile to comprise a plastics coating covering the core. Such a plastics coating can serve the purpose of providing a surface finish which is both attractive and durable. However, the provision of a plastics coating involves an extra manufacturing step. I have found that in profile as set out in the last preceding paragraph the resin-bonded fibre sheath can, upon use of a suitable resin, by itself provide a satisfactory surface finish for the profile.
The fibres which cover outer surfaces of the core are preferably glass fibres and are preferably provided as rovings extending in the direction of extrusion. However, fibres of materials other than glass may be found to be satisfactory, and arrangements of the fibres other than as rovings may be employed. For example, it is known in pultrusion techniques generally to make use also of chopped strand mats and woven strips. Preferably the fibres are distributed substantially evenly over each of the surfaces of the core.
Whilst it may be possible to lay the fibres in a dry condition on to the outer surfaces of the core, relying on resin from the core to permeate and bond them to themselves and to the core, it is preferred to apply them to the core in a resin-soaked condition.
The core preferably comprises a cellular filler (as hereinbefore defined). The cellular filler may comprise a silicate filler, for example in the form of hollow microspheres. However, other fillers such as jute or wood flour may be used. Mineral fillers (as described in specification No. 2 107 772 A) may additionally be incorporated in the core material to occupy space which would otherwise be occupied by resin between particles of the main filler. Such additional fillers may include forms of clay or a material known as Wollastunite, though calcium carbonate in a stearate-coated form is preferred.
There now follows a detailed description, to be read with reference to the accompanying drawings, of the manufacture of one form of structural profile of the kind defined. It is to be clearly understood that the method employed, and the profile made by the method, illustrate the invention by way of example only and not by way of limitation.
In the accompanying drawings, Figure 1 is a schematic layout of machinery suitable for use in carrying out the illustrative method; Figure 2 is a longitudinal sectional view through an extrusion die of the machinery, illustrating the introduction of glass rovings on to outer surfaces of a core being passed through the die; and Figure 3 is a cross sectional view, generally on the line Ill-Ill of Figure 1, of an electrode system suitable for use in an R.F. heater for curing the illustrative profile, the view also illustrating the final form of the profile.
As seen in Figure 3, extruded structural profile suitable for use as a timber substitute in the manufacture of frames for windows or the like comprises a plastics-coated glass-sheathed core 10, the plastics coating being indicated at 12 and the glass sheath at 14; the profile exhibits a high degree of dimensional and shape stability, possesses adequate strength to bear the loads likely to be encountered by window frames, and possesses good screw-holding properties. The core 10 comprises an unsaturated polyester resin incorporating a lightweight particulate silicate filler and an additional mineral filler which have been thoroughly mixed and closely compacted together and cured.
Suitable compositions for the core comprise, to each 100 parts by weight of silicate filler, from about 30 to 85 parts by weight of polyester resin, and from about 60 to about 20 parts by weight of additional filler. I have found a resin content of around 25% (by weight) to give good results. The silicate filler is a cellular filler in the form of hollow microspheres (giving components of relatively light weight and low thermal conductivity) a suitable material being supplied in the U.K. under the trade mark Fillite by Messrs. Fillite (Runcorn) Limited.
While different grades of Fillite are available, a grade having microspheres in a range from about 30 to about 100 microns in diameter is found to be particularly suitable. The additional filler, which occupies space which would otherwise be occupied by resin between particles of the cellular filler, may comprise at least one of the following substances viz. calcium carbonate (e.g. in the form of chalk or calcite), mica, talc, china clay and calcium silicate. I have obtained good results by using calcium carbonate in a stearate-coated form conveniently in a particle size in the range of from about 2 to about 100 microns, but preferably in the range of from about 2 to about 25 microns, such, for example, as is available in the U.K. from Blue Circle Cement Company Limited under the designation Snowcal (trade mark) type CW1.
The plastics coating 12 comprises an acrylic coating comprising a methylmethacrylate or ethyl methacrylate homopolymer or copolymer. Appropriate pigments may be incorporated in the coating to provide coloured finishes when desired. Curing of the sheathed and coated core, preferably by means of heat, effects cross linking between the coating and the sheath, and bonding between the sheath and the core, resulting in very strong bonding between the coating, the sheath, and the core.
Adequate performance of the coating, as to durability and providing a good finish to the product, may be achieved with relatively thin acrylic coatings, for example coatings no more than 0.5 mm thick.
In effecting continuous production of the profile by suitable extrusion machinery, thorough mixing and tight compaction of the core constituents comprising resin and filler is effected in a through feed mixing machine. This machine may be of the type known as a Buss-Kneader and supplied in the U.K.
by Buss-Hamilton Limited. However, it may be possible to use a simpler type of extruder such as a conventional rubber extruder. The mixing machine is indicated at 16 in the schematic layout of Figure I, the direction of extrusion being indicated (as also in Figure 2) by the arrow E.
The mixed composition is fed from the mixing machine 16 into a screw-type plastics extrusion machine 18. At the output end of the extrusion machine 18 is a first die portion 20 of the machinery, the die portion 20 being arranged to provide an extrusion of the desired overall cross-sectional shape.
As the core composition is extruded through the die portion 20, reinforcing fibres in the form of glass fibre rovings 22 supplied from a plurality of drums 24 are introduced into the die arrangement after being drawn through baths (not shown) of an unsaturated polyester resin. As shown in Figure 2, the resin-soaked glass rovings 22 become laid in the direction of extrusion on to outer surfaces of the core 10 and the sheathed core proceeds to be extruded through a second die portion 26 which imparts to it a desired cross-sectional shape. The glass fibres are distributed substantially evenly over each of the outer surfaces of the core.
The core material may conveniently be extruded so far at a temperature in the order of 40 C, so that although any necessary catalyst for use in the heat curing of the core material is already present in the core composition little or no curing takes place until the material is subsequently heated to curing temperature. If desired, curing may be initiated by the application of heat, for example by means of an R.F. generator, as the sheathed core passes through the second die portion 26.
On leaving the second die portion 26 the glasssheathed core (which emerges in a continuous length) passes through a third die portion 28 associated with a second plastics extrusion machine which is- arranged to extrude around the core a 0.3 mm thick coating of acrylic material, as above referred to. The acrylic coating may conveniently be extruded at a temperature in the order of 230 - 2400C so that on contact with the glass-sheathed core curing at the interface between the coating and the sheath is initiated. The curing process is continued as the sheathed and coated core passes through a supporting tunnel in an R.F. heater 30 to effect thorough curing of the core and the sheath, cross linking between the acrylic coating and the sheath, and bonding between the sheath and the core.With suitable resins and catalysts (e.g. peroxides) it may be found possible to effect curing by the heat provided in the application of the acrylic coating alone, without the use of R.F. heating.
As shown in Figure 3, the tunnel of the R.F.
heater 30, through which the profile passes during the final curing operation, is shaped (in cross section) to support the profile on all sides and conveniently comprises upper and lower electrodes 32, 34 respectively made of polished stainless steel (providing low friction surfaces for engagement with the profile) extending along the length of the tunnel (conveniently in pairs, each of some 1- to 23 metres long) separated by insulators 36, 38 of ceramic or PTFE material providing smooth side walls 40,42 adapted to support the side walls of the profile. An R.F. field of appropriate frequency (e.g. some 27 megahertz) and power is applied continuously across the electrodes 32, 34 during the curing operation.The upper and lower electrodes 32, 34 are respectively contoured to follow the outline shape of the corresponding portions of the profile.
The extrusion process is assisted by means of pulling machinery 44 exerting a pulling force on the glass rovings 22 which, by adhesion with the core material, assists in drawing the core material through the die arrangement. Conventional pultrusion equipment can be used; initially free ends of the rovings emerging from the apparatus can be attached to a block (not shown) having the peripheral shape of the profile being extruded, and this block is gripped by pulling mechanism which con leniently comprises an arrangement of belts or bands backed by rollers (sometimes referred to as a caterpillar arrangement) arranged to press against opposed faces of the block and, eventually, against corresponding opposed faces of the extruded profile. Tension so applied to the rovings 22 tends to maintain the rovings against the walls of the die arrangment.

Claims (23)

1. A method of manufacturing structural profile of the kind defined in which in passage of the profile through a shaping die a pulling force is exerted in the direction of extrusion on reinforcing fibres covering outer surfaces of the core.
2. A method according to claim 1 in which the fibres are provided as rovings extending in the direction of extrusion.
3. A method according to claim 2 in which the rovings are distributed substantially evenly over each of said surfaces of the core.
4. A method according to any one of claims 1 to 3 in which the fibres are laid on to said outer surfaces of the core in a resin-soaked condition.
5. A method according to any one of claims 1 to 4 in which the fibres are of glass.
6. A method according to any one of claims 1 to 5 in which the core comprises a cellular filler (as hereinbefore defined).
7. A method according to claim 6 in which the cellular filler comprises a silicate filler.
8. A method according to claim 7 in which the silicate filler is in the form of hollow microspheres.
9. A method according to any one of claims 6, 7 and 8 in which the core comprises also an additional filler occupying space which would otherwise be occupied by resin between particles of the cellular filler.
10. A method according to claim 9 in which the additional filler comprises calcium carbonate in a stearate-coated form.
11. A method according to any one of claims 1 to 10 in which at least the resin bonding the filler of the core comprises an unsaturated polyester resin.
12. A method according to any one of claims 1 to 11 comprising thoroughly mixing and compacting together the core constituents comprising resin and filler, extruding the core through a first die portion, laying said fibres on to said outer surfaces of the extruded core, and extruding the fibre-covered core through a second die portion whilst exerting a pulling force in the direction of extrusion on said fibres.
13. Structural profile of the kind defined in which the core is sheathed by resin-bonded reinforcing fibres bonded to the core.
14. Structural profile according to claim 13 in which the fibres are provided as rovings extending lengthwise of the profile.
15. Structural profile according to claim 14 in which the rovings are distributed at least substantially evenly around the core.
16. Structural profile according to any one of claims 13, 14 and 15 in which the fibres are of glass.
17. Structural profile according to any one of claims 13 to 16 in which the core comprises a cellular filler (as hereinbefore defined).
18. Structural profile according to claim 17 in which the cellular filler comprises a silicate filler.
19. Structural profile according to claim 18 in which the silicate filler is in the form of hollow microspheres.
20. Structural profile according to claim 19 in which the core comprises also an additional filler occupying space which would otherwise be occupied by resin between particles of the cellular filler.
21. Structural profile according to claim 20 in which the additional filler comprises calcium carbonate in a stearate-coated form.
22. A method of manufacturing structural profile of the kind defined, which method is substantially as hereinbefore described with reference to the accompanying drawing.
23. Structural profile, of the kind defined, substantially as hereinbefore described.
GB08416253A 1983-07-05 1984-06-26 The manufacture of structural profile Expired GB2143768B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08416253A GB2143768B (en) 1983-07-05 1984-06-26 The manufacture of structural profile

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB838318124A GB8318124D0 (en) 1983-07-05 1983-07-05 Structural members and compositions
GB08416253A GB2143768B (en) 1983-07-05 1984-06-26 The manufacture of structural profile

Publications (3)

Publication Number Publication Date
GB8416253D0 GB8416253D0 (en) 1984-08-01
GB2143768A true GB2143768A (en) 1985-02-20
GB2143768B GB2143768B (en) 1987-04-15

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GB08416253A Expired GB2143768B (en) 1983-07-05 1984-06-26 The manufacture of structural profile

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985005071A1 (en) * 1984-05-09 1985-11-21 Michael John Hewitt The manufacture of lightweight extruded structural profile
GB2160470A (en) * 1984-05-09 1985-12-24 Michael John Hewitt The manufacture of lightweight extruded structural profile
WO1987001986A1 (en) * 1985-10-07 1987-04-09 Owens-Corning Fiberglas Corporation Structural member and method of making
GB2186833A (en) * 1986-02-20 1987-08-26 Fiberforce Limited Pultrusion method
GB2194911A (en) * 1985-02-19 1988-03-23 Sven Erik Malmstrom Method of manufacturing elongated structural member
GB2203982A (en) * 1987-04-22 1988-11-02 Robert Strachan A granular filled and woven fibre or mat sheathed pultrusion
GB2223711A (en) * 1985-02-19 1990-04-18 Sven Erik Malmstrom Moulding fibre reinforced structural members
US5013512A (en) * 1985-02-19 1991-05-07 Malmstroem Sven E Method of manufacturing an elongated structural member
WO1991016192A1 (en) * 1990-04-18 1991-10-31 Caledonia Composites Limited Pultruded profiles
WO1997015744A1 (en) * 1995-10-24 1997-05-01 Peter Meier Shaped bodies, their production and their use
GB2434395A (en) * 2006-08-08 2007-07-25 Bowater Building Products Ltd Frame member with insulating portion
WO2009100940A2 (en) * 2008-02-15 2009-08-20 Bbg Gmbh & Co. Kg Method for producing a profile strip, moulding tool for use in said method and profile strip produced according to said method
ITBO20080610A1 (en) * 2008-10-07 2010-04-08 B Tec S R L DEVICE AND METHOD FOR THE REALIZATION OF A REINFORCED PROFILE AND PROFILE SO OBTAINED

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1206946A (en) * 1966-10-11 1970-09-30 English Electric Co Ltd Improvements in or relating to the continuous production of a fibre-reinforced plastics material
GB1290557A (en) * 1969-10-23 1972-09-27
GB1373782A (en) * 1972-10-05 1974-11-13 English Electric Co Ltd Manufacture of reinforced plastics
GB2082112A (en) * 1980-08-21 1982-03-03 Mitsubishi Petrochemical Co Pulltrusion of elongate fibre-reinforced resin articles
WO1982003243A1 (en) * 1981-03-17 1982-09-30 Michael John Hewitt Manufacture of structural members and compositions for use therein

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1206946A (en) * 1966-10-11 1970-09-30 English Electric Co Ltd Improvements in or relating to the continuous production of a fibre-reinforced plastics material
GB1290557A (en) * 1969-10-23 1972-09-27
GB1373782A (en) * 1972-10-05 1974-11-13 English Electric Co Ltd Manufacture of reinforced plastics
GB2082112A (en) * 1980-08-21 1982-03-03 Mitsubishi Petrochemical Co Pulltrusion of elongate fibre-reinforced resin articles
WO1982003243A1 (en) * 1981-03-17 1982-09-30 Michael John Hewitt Manufacture of structural members and compositions for use therein

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2160143B (en) * 1984-05-09 1989-04-12 Michael John Hewitt The manufacture of lightweight structural profile
GB2160143A (en) * 1984-05-09 1985-12-18 Michael John Hewitt The manufacture of lightweight extruded structural profile
GB2160470A (en) * 1984-05-09 1985-12-24 Michael John Hewitt The manufacture of lightweight extruded structural profile
WO1985005071A1 (en) * 1984-05-09 1985-11-21 Michael John Hewitt The manufacture of lightweight extruded structural profile
AU592530B2 (en) * 1984-05-09 1990-01-18 Michael John Hewitt The manufacture of lightweight extruded structural profile
GB2223711A (en) * 1985-02-19 1990-04-18 Sven Erik Malmstrom Moulding fibre reinforced structural members
GB2194911A (en) * 1985-02-19 1988-03-23 Sven Erik Malmstrom Method of manufacturing elongated structural member
GB2194911B (en) * 1985-02-19 1991-01-09 Sven Erik Malmstrom A method of manufacturing a elongate structural member.
GB2223711B (en) * 1985-02-19 1991-01-09 Sven Erik Malmstrom A method of manufacturing a elongate structural member.
US5013512A (en) * 1985-02-19 1991-05-07 Malmstroem Sven E Method of manufacturing an elongated structural member
WO1987001986A1 (en) * 1985-10-07 1987-04-09 Owens-Corning Fiberglas Corporation Structural member and method of making
GB2186833A (en) * 1986-02-20 1987-08-26 Fiberforce Limited Pultrusion method
WO1988008367A1 (en) * 1987-04-22 1988-11-03 Caledonia Composites Limited In-line core-filled pultruded profiles
GB2203982A (en) * 1987-04-22 1988-11-02 Robert Strachan A granular filled and woven fibre or mat sheathed pultrusion
US5120380A (en) * 1987-04-22 1992-06-09 Caledonia Composites Limited Method and apparatus for forming in-line core-filled pultruded profiles
US5264170A (en) * 1990-04-08 1993-11-23 Caledonia Composites Limited Method of manufacturing pultruded profiles
WO1991016192A1 (en) * 1990-04-18 1991-10-31 Caledonia Composites Limited Pultruded profiles
WO1997015744A1 (en) * 1995-10-24 1997-05-01 Peter Meier Shaped bodies, their production and their use
GB2434395A (en) * 2006-08-08 2007-07-25 Bowater Building Products Ltd Frame member with insulating portion
GB2434395B (en) * 2006-08-08 2011-03-09 Bowater Building Products Ltd A frame member for a window frame and a window frame comprising such a frame member
WO2009100940A2 (en) * 2008-02-15 2009-08-20 Bbg Gmbh & Co. Kg Method for producing a profile strip, moulding tool for use in said method and profile strip produced according to said method
WO2009100940A3 (en) * 2008-02-15 2009-10-08 Bbg Gmbh & Co. Kg Heat-insulating profile strip for window and facade components, production method and moulding tool
ITBO20080610A1 (en) * 2008-10-07 2010-04-08 B Tec S R L DEVICE AND METHOD FOR THE REALIZATION OF A REINFORCED PROFILE AND PROFILE SO OBTAINED

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Publication number Publication date
GB8416253D0 (en) 1984-08-01
GB2143768B (en) 1987-04-15

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