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GB668723A - Improvements in or relating to the formation of tubes from organic plastic material - Google Patents

Improvements in or relating to the formation of tubes from organic plastic material

Info

Publication number
GB668723A
GB668723A GB3299/48A GB329948A GB668723A GB 668723 A GB668723 A GB 668723A GB 3299/48 A GB3299/48 A GB 3299/48A GB 329948 A GB329948 A GB 329948A GB 668723 A GB668723 A GB 668723A
Authority
GB
United Kingdom
Prior art keywords
slot
tube
screws
width
air tube
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
GB3299/48A
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.)
British Xylonite Co Ltd
Original Assignee
British Xylonite Co 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 British Xylonite Co Ltd filed Critical British Xylonite Co Ltd
Publication of GB668723A publication Critical patent/GB668723A/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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/04—Extrusion blow-moulding
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/04—Extrusion blow-moulding
    • B29C49/04104—Extrusion blow-moulding extruding the material discontinuously
    • 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
    • B29C48/0017—Combinations of extrusion moulding with other shaping operations combined with blow-moulding or thermoforming
    • 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
    • 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
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/475—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using pistons, accumulators or press rams

Landscapes

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

Abstract

668,723. Extruding tubes of organic thermoplastic material. BRITISH XYLONITE CO., Ltd. Feb. 4, 1948 [Aug. 4, 1941], No.3299/48. Class 87(ii) Differences in the temperature and viscosity of plastic material may be compensated by adjusting the width of a slot 85 through which the material passes in the extrusion head. The extruded tube may be closed at its lower end and blown into contact with a mould as described in Specifi. cation 564,350 to form a hollow article. Plastic material from a heating chamber enters the extrusion head at 51 and flows through a series of openings, see Figs. 4 to 7 (not shown), so that it is) split up into 16 streams which pas: through fine holes in a web 82, Fig. 8 (not shown). The material then flows through the slot 85 into a chamber 86 and is extruded at 58. If the material becomes hotter and thus less viscous at one side, this is corrected by adjusting screws 95 to rock ring 92 and increase the width of the slot 85 at the appropriate side, thus increasing the flow and therefore decreasing the heating of the material at this side. Air is supplied to the tube through an air tube 62 mounted in a spherical member 68. The position of the air tube may be adjusted by screws 70b, which rotate the spherical member 68, to vary the wall thickness of the plastic tube. This movement of the member 68 is so small as not to affect the adjustments made to the width of the slot 85 by means of the ring 92. Whilst adjusting the position of the member 68, the pressure exerted on it by members 66, 67 may be relieved by adjusting screws 87. The extrusion head is heated by circulating oil between the threads of a screw 54, and the air tube may be internally cored for the passage of a heating medium. The extruded tube may be closed by raising the air tube 62 and simultaneously lowering a plunger 88 to apply an impulse to the plastic material in the chamber 86. In a modified apparatus, Figs. 9 to 12 and 14 to 20 (not shown), the position of the air tube 143, Fig. 9, is adjusted by four horizontal set screws, and the slot 85 is replaced by a slot 160 the width of which is adjusted by screws 165. This modified apparatus has the advantage that the flow resistance ring 161 may be easily removed.
GB3299/48A 1941-08-04 1948-02-04 Improvements in or relating to the formation of tubes from organic plastic material Expired GB668723A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US668723XA 1941-08-04 1941-08-04

Publications (1)

Publication Number Publication Date
GB668723A true GB668723A (en) 1952-03-19

Family

ID=22072249

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3299/48A Expired GB668723A (en) 1941-08-04 1948-02-04 Improvements in or relating to the formation of tubes from organic plastic material

Country Status (1)

Country Link
GB (1) GB668723A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1233571B (en) * 1961-03-20 1967-02-02 Owens Illinois Inc Method and device for feeding plastic material from a plasticizing device through a flow head to a nozzle for pressing out a strand, in particular for producing a hollow body from thermoplastic material by the blow molding process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1233571B (en) * 1961-03-20 1967-02-02 Owens Illinois Inc Method and device for feeding plastic material from a plasticizing device through a flow head to a nozzle for pressing out a strand, in particular for producing a hollow body from thermoplastic material by the blow molding process

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