GB1431101A - Extrusion of cross linkable plastics materials - Google Patents

Extrusion of cross linkable plastics materials

Info

Publication number
GB1431101A
GB1431101A GB434673A GB434673A GB1431101A GB 1431101 A GB1431101 A GB 1431101A GB 434673 A GB434673 A GB 434673A GB 434673 A GB434673 A GB 434673A GB 1431101 A GB1431101 A GB 1431101A
Authority
GB
United Kingdom
Prior art keywords
cylinder
port
cross
piston
linking
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
GB434673A
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.)
Uponor Wirsbo AB
Original Assignee
Wirsbo Bruks AB
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 Wirsbo Bruks AB filed Critical Wirsbo Bruks AB
Priority to GB434673A priority Critical patent/GB1431101A/en
Priority to DE2402968A priority patent/DE2402968A1/en
Priority to BE140113A priority patent/BE810083A/en
Priority to AU64891/74A priority patent/AU6489174A/en
Priority to JP49010855A priority patent/JPS49110748A/ja
Priority to FR7402708A priority patent/FR2215307B3/fr
Priority to IT67232/74A priority patent/IT1009124B/en
Priority to NL7401141A priority patent/NL7401141A/xx
Priority to LU69257A priority patent/LU69257A1/xx
Priority to DD176231A priority patent/DD109344A5/xx
Publication of GB1431101A publication Critical patent/GB1431101A/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
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
    • B29C48/83—Heating or cooling the cylinders
    • B29C48/832—Heating
    • 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/375—Plasticisers, homogenisers or feeders comprising two or more stages
    • B29C48/388—Plasticisers, homogenisers or feeders comprising two or more stages using a screw extruder and a ram or piston
    • 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
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • 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
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/10—Thermosetting resins
    • 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
    • B29K2301/00—Use of unspecified macromolecular compounds as reinforcement
    • B29K2301/10—Thermosetting resins

Landscapes

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

Abstract

1431101 Extruding cross-linked thermoplastics WIRSBO BRUKS AB 15 Jan 1974 [29 Jan 1973 6 July 1973] 4346/73 and 32329/73 Heading B5A Polyethylene or polypropylene material containing cross-linking agent, is heated by compression in an enclosed chamber to below the temperature at which cross-linking is initiated, e.g. 150‹ to 170‹ C., for polyethylene, and then by shear to initiate cross-linking, during delivery to and through a tube extrusion die, whereafter the cross-linking is completed prior to cooling. The material is preferably polyethylene including a free-radical cross-linking agent, e.g. cumene or benzoyl peroxide. The extrusion apparatus comprises a die 50 to which the material is alternately delivered from one of a pair of pistons 80, via an outlet port 33 and passage 41, or 42. The outlet ports 33 are each alternately opened and obturated by one of a pair of cylindrical ports 60, of a valve member 61, which is alternately displaced in opposite directions to obturate the port 33 in one cylinder 27 and simultaneously open the port 33 in the other cylinder, by the pressure of material in the other cylinder 27 developed by its piston 80. When the port 33 in one cylinder 27 is closed, and its piston 80 is retracted upstream of an inlet port 34, the material in granule or powder form is injected through the port 34 by one or more strokes of a piston (102), Fig. 3 (not shown), which effects some compression and consequential heating of the material. The compression is continued in the one cylinder by advancement of the piston 80 as the outlet port 33 remains obturated under the pressure of material being injected from the outlet port of the other cylinder 27. Thereafter, the pressure in the other cylinder is relaxed, and the pressure of the material under compression causes the valve to be displaced to discharge residual material from the port 33 of the other cylinder 27, prior to the piston being retracted in the other cylinder simultaneously with closing of its port 33 and opening of the port 33 in the one cylinder to permit delivery of the material therethrough by advance of the piston 80. During delivery to and through the die 50, the material is additionally heated to the temperature at which cross-linking is initiated, by heat from electrical elements 66, and by shear during delivering through the passages 41, 42 and the die 50. A temperature sensing device 64 is provided.
GB434673A 1973-01-29 1973-01-29 Extrusion of cross linkable plastics materials Expired GB1431101A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
GB434673A GB1431101A (en) 1973-01-29 1973-01-29 Extrusion of cross linkable plastics materials
DE2402968A DE2402968A1 (en) 1973-01-29 1974-01-22 PROCESS AND EXTRUSION PRESS FOR MOLDING CROSSLINKABLE PLASTICS
BE140113A BE810083A (en) 1973-01-29 1974-01-23 Extrusion of crosslinkable plastic material - by working under pressure, increasing temp. of material, generating shear forces, and passing through die
AU64891/74A AU6489174A (en) 1973-01-29 1974-01-25 Valve extruder
JP49010855A JPS49110748A (en) 1973-01-29 1974-01-25
FR7402708A FR2215307B3 (en) 1973-01-29 1974-01-28
IT67232/74A IT1009124B (en) 1973-01-29 1974-01-28 PROCEDURE AND DEVICE FOR THE STRUSION OF RE TICOLABLE PLASTIC MATERIALS
NL7401141A NL7401141A (en) 1973-01-29 1974-01-28
LU69257A LU69257A1 (en) 1973-01-29 1974-01-28
DD176231A DD109344A5 (en) 1973-01-29 1974-01-28

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB434673A GB1431101A (en) 1973-01-29 1973-01-29 Extrusion of cross linkable plastics materials
GB3232973 1973-07-06

Publications (1)

Publication Number Publication Date
GB1431101A true GB1431101A (en) 1976-04-07

Family

ID=26239058

Family Applications (1)

Application Number Title Priority Date Filing Date
GB434673A Expired GB1431101A (en) 1973-01-29 1973-01-29 Extrusion of cross linkable plastics materials

Country Status (9)

Country Link
JP (1) JPS49110748A (en)
AU (1) AU6489174A (en)
DD (1) DD109344A5 (en)
DE (1) DE2402968A1 (en)
FR (1) FR2215307B3 (en)
GB (1) GB1431101A (en)
IT (1) IT1009124B (en)
LU (1) LU69257A1 (en)
NL (1) NL7401141A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0033587B1 (en) * 1980-01-18 1983-05-11 Wirsbo Bruks Aktiebolag Preparation of shaped crosslinked materials

Also Published As

Publication number Publication date
FR2215307B3 (en) 1976-11-19
AU6489174A (en) 1975-07-31
DD109344A5 (en) 1974-11-05
IT1009124B (en) 1976-12-10
FR2215307A1 (en) 1974-08-23
DE2402968A1 (en) 1974-08-08
LU69257A1 (en) 1974-04-10
NL7401141A (en) 1974-07-31
JPS49110748A (en) 1974-10-22

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee