GB967881A - Improvements in or relating to the production of blown films from soft polyvinyl chloride - Google Patents

Improvements in or relating to the production of blown films from soft polyvinyl chloride

Info

Publication number
GB967881A
GB967881A GB33198/62A GB3319862A GB967881A GB 967881 A GB967881 A GB 967881A GB 33198/62 A GB33198/62 A GB 33198/62A GB 3319862 A GB3319862 A GB 3319862A GB 967881 A GB967881 A GB 967881A
Authority
GB
United Kingdom
Prior art keywords
melt
worm
diameter
polyvinyl chloride
zone
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
GB33198/62A
Inventor
Gunter Rohlig
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.)
Oerlikon Barmag AG
Original Assignee
Barmag Barmer Maschinenfabrik AG
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 Barmag Barmer Maschinenfabrik AG filed Critical Barmag Barmer Maschinenfabrik AG
Priority to GB33198/62A priority Critical patent/GB967881A/en
Priority to LU44091D priority patent/LU44091A1/xx
Priority to CH921763A priority patent/CH410382A/en
Publication of GB967881A publication Critical patent/GB967881A/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
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • 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
    • 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
    • B29C48/34—Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated
    • 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

Landscapes

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

Abstract

967,881. Tubular films. BARMER MASCHINENFABRIK A.G. Aug. 29, 1962, No. 33198/62. Heading B5B. In making tubular films, a mixture in powder form of polyvinyl chloride and more than 20% by weight of plasticizer (calculated on the mixture) is supplied to the entrance of an extruder, consolidated and melted in one or more zones, passed as a melt through an externally heated homogenization zone, deflected from horizontal to vertical direction and extruded as a tube which is then expanded. The homogenization zone comprises a worm, the depth of the recessed portions of which is 3-8% of the outer diameter of the worm, the length of the homogenization zone being at least 10 times the outer diameter of the worm, and at least the length of the entrance zone and consolidation zone together. The melt passing from the homogenization zone may be deflected around a deflector element in the shape of a right-angled rounded isosceles triangle. In one such embodiment (Figs. 1 and 2) a mixture of polyvinyl chloride and plasticizer, after passing through entrance, consolidation and homogenization zones, is deflected from horizontal to vertical in a ring element 1 containing mandrel 4. A recess 7 is formed in the mandrel, so that a triangular deflector element 5 is formed, around which the melt 6 flows. The melt impinging on the recess 7 divides into two streams flowing around the deflector element. The streams unite above the deflector element, and the melt is extruded between mandrel 4 and mouthpiece 2 as a tube. In an example, a mixture of polyvinyl chloride and plasticizer is supplied to a single-worm extruder having compression ratio 1: 4, worm diameter 90 mm. and an effective length of 24 times the diameter. After passing through entrance and consolidation zones, the melt is passed through a homogenization zone of length 12 times the worm diameter and a pitch depth (depth of recessed portions) of 3.2-3.5 mm. The melt is then deflected from horizontal to vertical and extruded through an annular nozzle of 250 mm. diameter.
GB33198/62A 1962-08-29 1962-08-29 Improvements in or relating to the production of blown films from soft polyvinyl chloride Expired GB967881A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB33198/62A GB967881A (en) 1962-08-29 1962-08-29 Improvements in or relating to the production of blown films from soft polyvinyl chloride
LU44091D LU44091A1 (en) 1962-08-29 1963-07-19
CH921763A CH410382A (en) 1962-08-29 1963-07-24 Process for the production of blown films from soft polyvinyl chloride and device for carrying out the process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB33198/62A GB967881A (en) 1962-08-29 1962-08-29 Improvements in or relating to the production of blown films from soft polyvinyl chloride

Publications (1)

Publication Number Publication Date
GB967881A true GB967881A (en) 1964-08-26

Family

ID=10349847

Family Applications (1)

Application Number Title Priority Date Filing Date
GB33198/62A Expired GB967881A (en) 1962-08-29 1962-08-29 Improvements in or relating to the production of blown films from soft polyvinyl chloride

Country Status (3)

Country Link
CH (1) CH410382A (en)
GB (1) GB967881A (en)
LU (1) LU44091A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GR64950B (en) * 1978-03-29 1980-06-10 Pwt Plastic World Tech Method and apparatus for continuous modulation by pushing and blowing of fine membranes made of plastic from particularly rigid chlor polyvinyl

Also Published As

Publication number Publication date
CH410382A (en) 1966-03-31
LU44091A1 (en) 1963-09-19

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