CA1039013A - Extruding continuous strip of glass-loaded polycarbonate - Google Patents

Extruding continuous strip of glass-loaded polycarbonate

Info

Publication number
CA1039013A
CA1039013A CA206,259A CA206259A CA1039013A CA 1039013 A CA1039013 A CA 1039013A CA 206259 A CA206259 A CA 206259A CA 1039013 A CA1039013 A CA 1039013A
Authority
CA
Canada
Prior art keywords
strip
rollers
maintained
extruder
zones
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.)
Expired
Application number
CA206,259A
Other languages
French (fr)
Other versions
CA206259S (en
Inventor
Montague A.W. Brown
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.)
Mb Tubex Ltd
Original Assignee
Mb Tubex 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 Mb Tubex Ltd filed Critical Mb Tubex Ltd
Application granted granted Critical
Publication of CA1039013A publication Critical patent/CA1039013A/en
Expired 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
    • 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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/918—Thermal treatment of the stream of extruded material, e.g. cooling characterized by differential heating or cooling
    • B29C48/9185—Thermal treatment of the stream of extruded material, e.g. cooling characterized by differential heating or cooling in the direction of the stream of the material
    • 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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • 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
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • 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
    • B29C48/05—Filamentary, e.g. strands
    • 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
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • B29C48/914—Cooling of flat articles, e.g. using specially adapted supporting means cooling drums
    • 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
    • B29C48/92—Measuring, controlling or regulating
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92523—Force; Tension
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92609—Dimensions
    • B29C2948/92647—Thickness
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B29C2948/92895—Barrel or housing
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92923—Calibration, after-treatment or cooling zone
    • 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
    • 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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/906—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article using roller calibration
    • 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
    • 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
    • B29K2105/12—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2709/00—Use of inorganic materials not provided for in groups B29K2703/00 - B29K2707/00, for preformed parts, e.g. for inserts
    • B29K2709/08—Glass

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

ABSTRACT OF THE DISCLOSURE

The invention comprises extruded glass-loaded polycarbonate strip or sheet for use as an electrical insulating material. The material can be extruded by a method and apparatus in which particulate glass-loaded polycarbonate material is firstly preheated and then extruded through an extruder. The material is passed through a die head to extrude a concave faced which passes through sizing rollers, over a cooling table and through take-off rollers to a take-up means such as a reel.

Description

-039Q~3 :~
The invention relates to extrusion.
In accordance with a preferred embodiment of the present invention, there is provided a method of producing a strip of glass fiber-filled polycarbonate, which comprises preheating glass fiber-filled polycarbonate granules, passing the heated granules to an extruder wherein they are extruded through a die adapted to form a strip having concave faces, passing said strip between heated sizing rollers adapted to produce a strip of rectilinear section and of a predetermined width and thickness, passing said strip over a cooling table, ~;
and thence between take-off rollers, adapted to maintain the tension of the strip, to a storage device. -;
Preferably the extruder is vented by a vacuum assisted vent. The sizing rollers are preferably maintained at a temperature of 180C, 155C and 180C respectively, and the take-off rollers are maintained at a temperature of below 150C.
In accordance with a further preferred embodiment of the present invention, there is provided an apparatus for 20 producing a strip of glass fiber-lined polycarbonate comprising in sequence a hopper arranged to feed glass fiber-filled poly-carbonate granules to an extrusion device comprising a die having an extrusion orifice adapted to form a strip having concave faces, heated sizing rollers arranged to form said strip into a rectilinear section of a predetermined width and , thickness, a cooling table, take-off rollers adapted to main-tain the tension in the strip, and a storage device.
The foregoing and further features of the inven-tion may be more readily understood from the following descrip-,, ~
tion of a preferred embodiment thereof, by way of example, ~-~ with reference to the accompanying drawing which is a schematic j representation of an apparatus for extruding glass-loaded 3, polycarbonate material into strips or sheet.
, Referring now to the drawing the glass-loaded polycarbonate in granular fonn (e.g. Bayer type 8030) is
- 2 ,~.. . . . . . . . .

T~-l ~ ~039013 passed from a sack 1 or other container via a hopper loader 2 into a hopper 3. The material is pre-dried in the hopper ~ in a hot air current at 115C for approximately ; five hour~ or in a free standing oven.
; The material is then pas~ed into a fou~:or fire ; zone extruder 4 having respective temperatures of 240C,280C, 270C and 280C for a four ~one extruder and 24aa, 280C, 270~C~ 280~C and 280C for a five zone extruder, ~referably the junction between the second and third zone~
0 i8 vented by a vacuum assisted vent 5. When a five zone extruder i8 used. t~e vent 5 is located between the third and fourth zones. From the fourth zone the material î8 passed. through an adapter 6 to a profile die head 7 having ~, a 1~" land to extrude a concave faced rectilinear section , of a thickness approximately 15~ greater than the re~uired ~
product. The adapter and die are maintained at a temper-ature of between 260C and 265C. ~.
The extruded.material is then passed ~hrough-sizing rollers 8 which c~mprise three rollers which are d.riven by chains from variable speed motors. The extruded :1 . . material passes between the nip of the upper roller and middle roller and is sized to correct thicknes~ by adjust-ment of the pressure of the upper roller. The material then passes around the middle roller to between the nip of the middle and lower rollers with thickness being maintained by pressure adjustment of the lower roller. The rollers are at respective temperatures of 180C, 150C and 180C and the speed thereof together with the extruder speed is adjusted to provide the required width of ~he final product and balanced feed of material.

. `
2~.7.74.
tgs . dlf .
C

~~` TX~l 9 ~1 3 ~he material emanating ~rom rollers 8 i~ then passed over a cooling table 9 to cool to a temperature below 150~. The material i~ monitored for thicknes~ by monitor 10 at the cooling table 9.
~he material i~ then passed. through the nip of take-o~ rollers ll, at a temperature of less than 150C, the ~peed o~ which is adausted to maintain the required ` width of the final strip or sheet.
The strip or sheet is then passed through a -~
footage counter 12 to a take-up ~pool 13.
The ~trip or sheet so produced i~ particularly suitable for use as electrical insulating material for use in switche~, relays, etc. and is produced. in a required :~ .
thickness and width for a particular u~e. ~he strip or sheet can be pre-punched to provide a given configuration and. then 6tored. for use in as~embly of the electrical components. The strip or sheet can be stored. in contin- -uous reel form read.y for on-line automatic or hand a~sembly.
~he portion of material removed during punching can be . 20 reprocessed for further use. Due to high temperature . resistance the material can be used for assembly prior to: or during, hand or automatic sold.ering processe~. ~he sheet or strip can be colour cod.ed ~or product reference. ~.
Due to its excellent shear properties press tool~ used for punching rarely require sharpening and any d.ust produced . during working of the material does not tend to cause clogging of the machine parts. ... .
~he temperatures given above for the extruder ~i ~ones, adapter and die head are intended as expemplary.
~ These temperatures may be varied by about + 10C according to ambient condition3, the particular material u~ed and the type of extru~ion machine.
, .
.. 2~.7.74.
: - tgs.dlf. 4 .:~. - . : . . .. ~ - . , . , ~ ~ .. . .... .. .. . . ..

Claims (9)

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
1. A method of producing a strip of glass fiber-filled polycarbonate, which comprises preheating glass fiber-filled polycarbonate granules, passing the heated granules to an extruder wherein they are extruded through a die adapted to form a strip having concave faces, passing said strip between heated sizing rollers adapted to produce a strip of rectilinear section and of a predetermined width and thickness, passing said strip over a cooling table, and thence between take-off rollers, adapted to maintain the tension of the strip, to a storage device.
2. A method as claimed in claim 1, wherein the extruder is vented by a vacuum-assisted vent.
3. A method as claimed in claim 1 or 2, wherein the extruder comprises a barrel having four zones maintained at respective temperatures of substantially 240°C., 280°C., 270°C., and 280°C.
4. A method as claimed in claim 1 or 2, wherein the extruder comprises a barrel having five zones maintained at respective temperatures of substantially 240°C., 280°C., 270°C., 280°C., and 280°C.
5. A method as claimed in claims 1 or 2, wherein said die is maintained at a temperature of between 260°C. and 265°C.
6. A method as claimed in claim 1 or 2, wherein there are three sizing rollers maintained at a temperature of substan-tially 180°C., 155°C., and 180°C. respectively and the take-off rollers are maintained at a temperature of below 150°C.
7. An apparatus for producing a strip of glass fiber-lined polycarbonate comprising in sequence a hopper arranged to feed glass fiber-filled polycarbonate granules to an extrusion device comprising a die having an extrusion orifice adapted to form a strip having concave faces, heated sizing rollers arranged to form said strip into a rectilinear section of a pre-determined width and thickness, a cooling table, take-off rollers adapted to maintain the tension in the strip, and a storage device.
8. An apparatus as claimed in claim 7, wherein said extruder comprises a barrel having four or five heating zones.
9. An apparatus as claimed in claim 8, wherein a vacuum assisted vent is located between the junction of the second and third zones of a four zone barrel or between the junction of the third and fourth zones of a five zone barrel.
CA206,259A 1973-08-11 1974-08-01 Extruding continuous strip of glass-loaded polycarbonate Expired CA1039013A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3813173A GB1452323A (en) 1973-08-11 1973-08-11 Extrusion of glass fibre-filled polycarbonate

Publications (1)

Publication Number Publication Date
CA1039013A true CA1039013A (en) 1978-09-26

Family

ID=10401401

Family Applications (1)

Application Number Title Priority Date Filing Date
CA206,259A Expired CA1039013A (en) 1973-08-11 1974-08-01 Extruding continuous strip of glass-loaded polycarbonate

Country Status (6)

Country Link
JP (1) JPS5045859A (en)
CA (1) CA1039013A (en)
DE (1) DE2437508A1 (en)
FR (1) FR2240102B3 (en)
GB (1) GB1452323A (en)
IT (1) IT1019823B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4500603A (en) * 1979-08-02 1985-02-19 Celanese Corporation Electrical grade extruded filled thermoplastic sheet material and process for the manufacture thereof
DE3028993A1 (en) * 1979-08-02 1981-02-19 Celanese Corp FILLED EXTRUDED ENDLESS THERMOPLASTIC FLAT MATERIALS AND THEIR PRODUCTION
US4479988A (en) * 1981-07-02 1984-10-30 Reddiplex Limited Spacer bar for double glazing

Also Published As

Publication number Publication date
DE2437508A1 (en) 1975-02-27
FR2240102A1 (en) 1975-03-07
GB1452323A (en) 1976-10-13
IT1019823B (en) 1977-11-30
FR2240102B3 (en) 1977-06-10
JPS5045859A (en) 1975-04-24

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