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GB749919A - Improvements in and apparatus for the production of blown foils of hard polyvinyl chloride - Google Patents

Improvements in and apparatus for the production of blown foils of hard polyvinyl chloride

Info

Publication number
GB749919A
GB749919A GB26193/53A GB2619353A GB749919A GB 749919 A GB749919 A GB 749919A GB 26193/53 A GB26193/53 A GB 26193/53A GB 2619353 A GB2619353 A GB 2619353A GB 749919 A GB749919 A GB 749919A
Authority
GB
United Kingdom
Prior art keywords
pict
polyvinyl chloride
core
endless screw
screw
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
GB26193/53A
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 GB26193/53A priority Critical patent/GB749919A/en
Publication of GB749919A publication Critical patent/GB749919A/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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • 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
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • 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
    • B29C48/0019—Combinations of extrusion moulding with other shaping operations combined with shaping by flattening, folding or bending
    • 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
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils

Landscapes

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

Abstract

<PICT:0749919/IV(a)/1> <PICT:0749919/IV(a)/2> <PICT:0749919/IV(a)/3> <PICT:0749919/IV(a)/4> Tubular foils are produced from hard polyvinyl chloride by means of an endless screw press in which the ratio of the space between the first threads to the space between the last threads is between 3 : 1 and 5 : 1, together with a blowing head having a cross-section free from obstruction within the whole of the straight part before the annular orifice. Stabilizers and/or waxes may be added to the material before plasticising. Fig. 1 shows an endless screw press 1 which feeds the material to an extrusion head 2 having an unobstructed annular passage, air being blown in at 3 to produce a tubular foil 4, which is flattened by rollers 5 and wound up at 6. The endless screw may have any of the shapes shown in Figs. 2-4 to give the specified degree of compression of the material being fed. In Fig. 2 the core of the screw is tapered, in Fig. 3 the core is cylindrical, but the pitch of the thread becomes smaller towards the discharge end, in Fig. 4 the core is tapered and the thread pitch becomes smaller. A multiplethread endless screw may also be used. For powdered polyvinyl chloride, the length of the screw should be 10-20 times its diameter.
GB26193/53A 1953-09-23 1953-09-23 Improvements in and apparatus for the production of blown foils of hard polyvinyl chloride Expired GB749919A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB26193/53A GB749919A (en) 1953-09-23 1953-09-23 Improvements in and apparatus for the production of blown foils of hard polyvinyl chloride

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB26193/53A GB749919A (en) 1953-09-23 1953-09-23 Improvements in and apparatus for the production of blown foils of hard polyvinyl chloride

Publications (1)

Publication Number Publication Date
GB749919A true GB749919A (en) 1956-06-06

Family

ID=10239806

Family Applications (1)

Application Number Title Priority Date Filing Date
GB26193/53A Expired GB749919A (en) 1953-09-23 1953-09-23 Improvements in and apparatus for the production of blown foils of hard polyvinyl chloride

Country Status (1)

Country Link
GB (1) GB749919A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3343216A (en) * 1962-10-22 1967-09-26 Dow Chemical Co Apparatus for the preparation of foamed sheet material
EP0045501A2 (en) * 1980-08-01 1982-02-10 Union Carbide Corporation Method for extruding granular low density narrow molecular weight distribution linear ethylene polymers
EP0051880A2 (en) * 1980-11-12 1982-05-19 Union Carbide Corporation An apparatus and method for extruding ethylene polymers
EP0595112A1 (en) * 1992-10-26 1994-05-04 Bridgestone Corporation Screw for double-shaft extruding device and double-shaft extruding device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3343216A (en) * 1962-10-22 1967-09-26 Dow Chemical Co Apparatus for the preparation of foamed sheet material
EP0045501A2 (en) * 1980-08-01 1982-02-10 Union Carbide Corporation Method for extruding granular low density narrow molecular weight distribution linear ethylene polymers
EP0045501A3 (en) * 1980-08-01 1983-01-19 Union Carbide Corporation Method for extruding granular low density narrow molecular weight distribution linear ethylene polymers
EP0051880A2 (en) * 1980-11-12 1982-05-19 Union Carbide Corporation An apparatus and method for extruding ethylene polymers
EP0051880A3 (en) * 1980-11-12 1983-01-26 Union Carbide Corporation An apparatus and method for extruding ethylene polymers
EP0595112A1 (en) * 1992-10-26 1994-05-04 Bridgestone Corporation Screw for double-shaft extruding device and double-shaft extruding device
US5464282A (en) * 1992-10-26 1995-11-07 Bridgestone Corporation Screw for double-shaft extruding device and double-shaft extruding device

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