GB1270865A - Improvement in process and apparatus for extruding thermoplastic tubing and tubular films - Google Patents

Improvement in process and apparatus for extruding thermoplastic tubing and tubular films

Info

Publication number
GB1270865A
GB1270865A GB43079/69A GB4307969A GB1270865A GB 1270865 A GB1270865 A GB 1270865A GB 43079/69 A GB43079/69 A GB 43079/69A GB 4307969 A GB4307969 A GB 4307969A GB 1270865 A GB1270865 A GB 1270865A
Authority
GB
United Kingdom
Prior art keywords
mandrel
helium
die
zone
film
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
GB43079/69A
Inventor
John Bennett Lyon
Hung Han Yang
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of GB1270865A publication Critical patent/GB1270865A/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
    • B29C48/90—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
    • B29C48/901—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 of hollow bodies
    • B29C48/902—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 of hollow bodies internally
    • 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

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

Abstract

1,270,865. Tubular films; extrusion. E.I. DU PONT DE NEMOURS & CO. 29 Aug., 1969 [30 Aug., 1968], No. 43079/69. Headings B5A and B5B. A tubular film casting and orientation process comprises the steps of (a) extruding a molten thermoplastic polymer through an annular die, and (b) melt-drawing the tubular film so formed over an internally cooled mandrel having a portion of reduced outer diameter immediately downstream of the die, introducing helium gas radially of the mandrel and adjacent in a zone between the die and the plane of initial quenching in a direction toward the interior surface of the film and circulating the gas in the zone, the temperature of the helium being substantially below the film temperature in the zone. The helium may be removed radially at a location closer to the annular die than the location of helium introduction, thus providing a helium flow counter-current to the movement of the tubular film. The polymer may be polyethylene or polypropylene. The pressure of the helium in the zone may be sufficient to resist neck-in of the film. The plane of initial quenching is the plane perpendicular to the axis of the mandrel defined by the circumferential touch-down point at which the tubular film first contacts the mandrel as it is drawn thereover along its length. As shown, a tubular film 10 is drawn from the swollen molten polymer ring 11 which is extruded from the annular die 12. The internal quench mandrel 13 is provided with internal cooling means (not shown) and has an undercut portion 14 extending from the leading edge 15 of the mandrel to the ring 16 round the mandrel at which the tubular film first contacts the mandrel. The mandrel is supported on the face of the die 12 by the post 20. Helium at a temperature substantially below that of the portion of the film adjacent the undercut portion 14 of the mandrel enters the zone between the plane of initial quenching 16 and the die 12 through inlet duct 21 and radial helium entrance ducts 22. Volatile components present in the polymer diffuse readily through the helium in the zone and condense on the undercut portion 14 of the mandrel. Absorbent packing 23 may be provided to absorb the condensate and exit ducts 24 and 25 are provided in the support post 20 to permit the helium to flow through packing 23 and out through the ducts 26. The packing 23 is supported on baffle plate 27 and an insulation disc 28 may be provided to cover the face of the die 12. The production of polyolefin films is exemplified.
GB43079/69A 1968-08-30 1969-08-29 Improvement in process and apparatus for extruding thermoplastic tubing and tubular films Expired GB1270865A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US75647768A 1968-08-30 1968-08-30

Publications (1)

Publication Number Publication Date
GB1270865A true GB1270865A (en) 1972-04-19

Family

ID=25043660

Family Applications (1)

Application Number Title Priority Date Filing Date
GB43079/69A Expired GB1270865A (en) 1968-08-30 1969-08-29 Improvement in process and apparatus for extruding thermoplastic tubing and tubular films

Country Status (4)

Country Link
BE (1) BE738194A (en)
DE (1) DE1944045A1 (en)
FR (1) FR2016662A1 (en)
GB (1) GB1270865A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015051774A1 (en) * 2013-10-13 2015-04-16 Reifenhäuser GmbH & Co. KG Maschinenfabrik Inner cooling body for a blown film extruder, blown film extruder comprising said inner body and method for operating said blown film extruder

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4008022A (en) * 1975-02-28 1977-02-15 General Electric Company Thermoplastic tube seal and cooling means
SE434930B (en) * 1982-04-29 1984-08-27 Aga Ab PROCEDURAL KIT AND DEVICE FOR COOLING EXTRADED RUBRICULAR FORMS WITH LIQUID CHOICE

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015051774A1 (en) * 2013-10-13 2015-04-16 Reifenhäuser GmbH & Co. KG Maschinenfabrik Inner cooling body for a blown film extruder, blown film extruder comprising said inner body and method for operating said blown film extruder
CN105636760A (en) * 2013-10-13 2016-06-01 莱芬豪舍机械制造两合公司 Inner cooling body for a blown film extruder, blown film extruder comprising said inner body and method for operating said blown film extruder

Also Published As

Publication number Publication date
FR2016662A1 (en) 1970-05-08
DE1944045A1 (en) 1970-03-05
BE738194A (en) 1970-03-02

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