GB1528728A - Blow-head for the manufacture of tubular films by the extrusion process - Google Patents

Blow-head for the manufacture of tubular films by the extrusion process

Info

Publication number
GB1528728A
GB1528728A GB27748/77A GB2774877A GB1528728A GB 1528728 A GB1528728 A GB 1528728A GB 27748/77 A GB27748/77 A GB 27748/77A GB 2774877 A GB2774877 A GB 2774877A GB 1528728 A GB1528728 A GB 1528728A
Authority
GB
United Kingdom
Prior art keywords
film
die part
heat
air
barrier comprises
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
GB27748/77A
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.)
Demag Kunststofftechnik Zweigniederlassung der Demag AG
Original Assignee
Demag Kunststofftechnik Zweigniederlassung der Demag 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 Demag Kunststofftechnik Zweigniederlassung der Demag AG filed Critical Demag Kunststofftechnik Zweigniederlassung der Demag AG
Publication of GB1528728A publication Critical patent/GB1528728A/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
    • B29C48/908—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 characterised by calibrator surface, e.g. structure or holes for lubrication, cooling or venting
    • 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
    • B29C48/27—Cleaning; Purging; Avoiding contamination
    • B29C48/272—Cleaning; Purging; Avoiding contamination of dies
    • 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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9115—Cooling of hollow articles
    • B29C48/912—Cooling of hollow articles of tubular films
    • B29C48/913—Cooling of hollow articles of tubular films externally

Landscapes

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

Abstract

1528728 Heat insulated film blowing head DEMAG KUNSTSTOFFTECHNIK ZWEIGNIEDERLASSUNG DER DEMAG AG 1 July 1977 [2 July 1976] 27748/77 Heading B5A Apparatus for producing a tubular film 5 of low density polyethylene, polypropylene, or polyamide comprises inner and outer extrusion die parts 4, 6<SP>1</SP>, defining an annular outlet 13 from which a tube of the material is extruded and inflated into the film, an annular air cooling outlet slit 12 surrounding the die part 6<SP>1</SP> and from which cooling air is directed axially of, and in the same direction as the film 5 to cool its exterior, and a heat barrier 18 between the extrusion and air outlets 13, 12 to reduce heat transfer therebetween. In the Fig. 1 embodiment (not shown), the heat barrier comprises an air gap (14) extending from the downstream face of the outer die part (6). In the Fig. 2 embodiment the barrier comprises a closed air gap 18 defined between the outer die part 6<SP>1</SP> and a ring 15, which defines the inner surface of the outlet 12 and channel 10 and has a highly polished heat reflecting surface facing the gap 18. In the Fig. 3 embodiment (not shown), the barrier comprises a layer of polytetrafluoroethylene on the exterior of the outer die part (6<SP>11</SP>). The film may comprise low density polyethylene, propylene, or polyamide.
GB27748/77A 1976-07-02 1977-07-01 Blow-head for the manufacture of tubular films by the extrusion process Expired GB1528728A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762629789 DE2629789A1 (en) 1976-07-02 1976-07-02 BLOW HEAD FOR THE PRODUCTION OF TUBE FILMS IN THE EXTRUSION PROCESS

Publications (1)

Publication Number Publication Date
GB1528728A true GB1528728A (en) 1978-10-18

Family

ID=5982068

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27748/77A Expired GB1528728A (en) 1976-07-02 1977-07-01 Blow-head for the manufacture of tubular films by the extrusion process

Country Status (3)

Country Link
DE (1) DE2629789A1 (en)
FR (1) FR2356495A1 (en)
GB (1) GB1528728A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10596741B2 (en) 2013-07-26 2020-03-24 Windmöller & Hölscher Kg Blown film extrusion device and method for controlling the temperature

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9102433U1 (en) * 1991-03-01 1991-05-23 Reifenhäuser GmbH & Co Maschinenfabrik, 53844 Troisdorf Device for producing a plastic film

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH507085A (en) * 1969-05-09 1971-05-15 Multifol Patentverwertungs Ag Process for producing a partially stretched plastic film material, device for carrying out the process and a product produced by this process
DE2027992A1 (en) * 1970-06-06 1971-12-16 Schlayer Polydress Gmbh Plastic tubular film - with roughened inner surfaces - preventing the sack sides from sticking together
DE2306834C2 (en) * 1973-02-12 1982-07-08 Windmöller & Hölscher, 4540 Lengerich Film die head for the production of tubular films

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10596741B2 (en) 2013-07-26 2020-03-24 Windmöller & Hölscher Kg Blown film extrusion device and method for controlling the temperature

Also Published As

Publication number Publication date
FR2356495A1 (en) 1978-01-27
DE2629789A1 (en) 1978-01-05
FR2356495B3 (en) 1980-05-09

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee