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GB1351973A - Process and apparatus for the manufacture of tubular films of synthetic organic thermoplastic materials which tubes are capable of shrinking longitudinally without changing their internal diameter - Google Patents

Process and apparatus for the manufacture of tubular films of synthetic organic thermoplastic materials which tubes are capable of shrinking longitudinally without changing their internal diameter

Info

Publication number
GB1351973A
GB1351973A GB5379471A GB5379471A GB1351973A GB 1351973 A GB1351973 A GB 1351973A GB 5379471 A GB5379471 A GB 5379471A GB 5379471 A GB5379471 A GB 5379471A GB 1351973 A GB1351973 A GB 1351973A
Authority
GB
United Kingdom
Prior art keywords
film
internal diameter
films
stretching
tubular
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
GB5379471A
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.)
Huels AG
Original Assignee
Chemische Werke Huels 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 Chemische Werke Huels AG filed Critical Chemische Werke Huels AG
Publication of GB1351973A publication Critical patent/GB1351973A/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
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/003—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor characterised by the choice of material
    • 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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
    • 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
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/06—Making preforms having internal stresses, e.g. plastic memory
    • B29C61/08—Making preforms having internal stresses, e.g. plastic memory by stretching tubes
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/001—Tubular films, sleeves
    • B29L2023/002—Sausage casings

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

1351973 Heat-shrinkable tubular films CHEMISCHE WERKE HULS AG 19 Nov 1971 [21 Nov 1970] 53794/71 Heading B5B Heat-shrinkable tubular films which are suitable for use in packaging foodstuffs and at the temperature of subsequent processing shrink in volume whilst retaining their predetermined internal diameter (i.e. they shrink only in the longitudinal direction) are prepared by a process which involves longitudinally stretching a tubular film at a temperature substantially below the melting range of the synthetic organic thermoplastic film material whilst at the same time maintaining the internal diameter of the film constant in the stretching zone. The films are prepared by longitudinally stretching a conventionally melt-extruded tubular film between feed godet rollers 9 arranged in stretcher stand 8 and draw godet rollers 11 arranged in a second stretcher stand 12, the film being inflated to its predetermined internal diameter by the injection of a gaseous or liquid medium at A and heated to and stretched at a temperature below its melting range in a heating channel 10. Variations in the width of the lay-flat film wound up on roller 13 are monitored by a mechanical or optical sensing device (not shown) which is operatively connected to motor 14 and spindle 15 which move the second stretching stand 12 from C to B or from C to D to accommodate any variations in the pressure of the inflating medium and thus maintain the internal diameter of the tubular film constant in the stretching zone. The thermoplastic material may be a polyolefin, a polyester or a polyamide which may be stretched at a ratio of from 1À1 to 6. Examples relate to the preparation of heat shrinkable films of polylauryl lactam and polyethylene which are heated in the heating channel 10 to between 80‹ C. and 100‹ C. and 115‹ C. to 120‹ C. respectively. The film inflating medium may be replaced in the stretching zone by a mandrel.
GB5379471A 1970-11-21 1971-11-19 Process and apparatus for the manufacture of tubular films of synthetic organic thermoplastic materials which tubes are capable of shrinking longitudinally without changing their internal diameter Expired GB1351973A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702057255 DE2057255A1 (en) 1970-11-21 1970-11-21 Process for the production of tubular films from thermoplastics with a defined volume shrinkage using the blow molding process

Publications (1)

Publication Number Publication Date
GB1351973A true GB1351973A (en) 1974-05-15

Family

ID=5788719

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5379471A Expired GB1351973A (en) 1970-11-21 1971-11-19 Process and apparatus for the manufacture of tubular films of synthetic organic thermoplastic materials which tubes are capable of shrinking longitudinally without changing their internal diameter

Country Status (7)

Country Link
AU (1) AU468909B2 (en)
BR (1) BR7107730D0 (en)
CS (1) CS179959B2 (en)
DE (1) DE2057255A1 (en)
ES (1) ES397196A1 (en)
GB (1) GB1351973A (en)
HU (1) HU164393B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4031389A1 (en) * 1990-10-04 1992-04-09 Mudder H Europlast POLYMER MASS FROM POLYESTER AND AN ETHYLENE METHACRYLIC ACID COPOLYMER
CN103072248A (en) * 2013-01-14 2013-05-01 平阳县大宇塑料机械有限公司 Plastic extrusion flat film wire drawing machine
CN111745943A (en) * 2020-06-11 2020-10-09 常州海菲尔机械有限公司 Heating secondary blowing process in film blowing machine
CN113954341A (en) * 2021-11-03 2022-01-21 宁波勤邦新材料科技有限公司 Shaping stretching equipment of solar energy backplate base film

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0498249B1 (en) * 1991-02-07 1998-08-26 Hercules Incorporated Process for producing shrink film and resultant shrink film layers and laminates
US5851610A (en) * 1991-02-07 1998-12-22 Applied Extrusion Technologies, Inc. Shrink films and articles including the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4031389A1 (en) * 1990-10-04 1992-04-09 Mudder H Europlast POLYMER MASS FROM POLYESTER AND AN ETHYLENE METHACRYLIC ACID COPOLYMER
CN103072248A (en) * 2013-01-14 2013-05-01 平阳县大宇塑料机械有限公司 Plastic extrusion flat film wire drawing machine
CN111745943A (en) * 2020-06-11 2020-10-09 常州海菲尔机械有限公司 Heating secondary blowing process in film blowing machine
CN113954341A (en) * 2021-11-03 2022-01-21 宁波勤邦新材料科技有限公司 Shaping stretching equipment of solar energy backplate base film

Also Published As

Publication number Publication date
DE2057255A1 (en) 1972-05-25
CS179959B2 (en) 1977-12-30
BR7107730D0 (en) 1973-02-22
AU3585171A (en) 1973-05-24
HU164393B (en) 1974-02-28
ES397196A1 (en) 1974-05-01
AU468909B2 (en) 1973-05-24

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees