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GB1437979A - Method and apparatus for continuously varying the cross-section of thermoplastic film webs - Google Patents

Method and apparatus for continuously varying the cross-section of thermoplastic film webs

Info

Publication number
GB1437979A
GB1437979A GB4018473A GB4018473A GB1437979A GB 1437979 A GB1437979 A GB 1437979A GB 4018473 A GB4018473 A GB 4018473A GB 4018473 A GB4018473 A GB 4018473A GB 1437979 A GB1437979 A GB 1437979A
Authority
GB
United Kingdom
Prior art keywords
web
heating
stretching
cross
section
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
GB4018473A
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.)
Hoechst AG
Original Assignee
Hoechst 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 Hoechst AG filed Critical Hoechst AG
Publication of GB1437979A publication Critical patent/GB1437979A/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
    • 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
    • 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
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • 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
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C2037/90—Measuring, controlling or regulating
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould

Landscapes

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

Abstract

1437979 Non-uniform stretching of films HOECHST AG 24 Aug 1973 [28 Aug 1972] 40184/73 Heading B5B The cross-section of thermoplastics film webs is varied by heating the web non-uniformly prior to and optionally during longitudinal stretching, and varying the non-uniformity so that the temperature distribution across the web changes with time, the temperature differences in the web causing non-uniform stretching of the film. The heating may be effected by several infra-red radiators each of which can be separately controlled to obtain the desired effect, or by a single heater separated from the web by a perforated plate which is moved transversely across the web, thereby moving the heat "shadow" and thus zones of no, or little heating to and fro across the web. Further stretching may be effected prior to or after the above process after which the web may be thermofixed. Preferred films for use in the process are those of polyethylene terephthalate, polyethylene, polypropylene and polyamides. See also Specification 1,437,980.
GB4018473A 1972-08-28 1973-08-24 Method and apparatus for continuously varying the cross-section of thermoplastic film webs Expired GB1437979A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722242285 DE2242285A1 (en) 1972-08-28 1972-08-28 METHOD AND DEVICE FOR CONTINUOUS CHANGING THICKNESS PROFILE OF THERMOPLASTIC FILM

Publications (1)

Publication Number Publication Date
GB1437979A true GB1437979A (en) 1976-06-03

Family

ID=5854782

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4018473A Expired GB1437979A (en) 1972-08-28 1973-08-24 Method and apparatus for continuously varying the cross-section of thermoplastic film webs

Country Status (8)

Country Link
JP (1) JPS4953962A (en)
BE (1) BE804121A (en)
DE (1) DE2242285A1 (en)
FR (1) FR2197708B1 (en)
GB (1) GB1437979A (en)
IT (1) IT990326B (en)
LU (1) LU68313A1 (en)
NL (1) NL7311376A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6079916A (en) * 1983-10-11 1985-05-07 Mitsubishi Monsanto Chem Co Heating method of thermoplastic resin film
DE3802146C1 (en) * 1988-01-26 1989-02-23 Battenfeld Extrusionstechnik Gmbh, 4970 Bad Oeynhausen, De
EP1899141A1 (en) * 2005-06-01 2008-03-19 3M Innovative Properties Company Cross-web heat distribution system and method using repositionable heaters
DE102011085735A1 (en) * 2011-11-03 2013-05-08 Windmöller & Hölscher Kg Stretching unit and method for length of film webs
JP2013107225A (en) * 2011-11-18 2013-06-06 Okura Ind Co Ltd Tenter device
JP7519182B2 (en) * 2017-05-17 2024-07-19 エヴェリックス インコーポレイテッド Ultra-thin, flexible thin-film filters with spatially or temporally varying optical properties and methods for making same - Patents.com

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1429227A (en) * 1965-04-13 1966-02-18 Du Pont Method for improving the roll-up ability of polymeric organic films

Also Published As

Publication number Publication date
NL7311376A (en) 1974-03-04
BE804121A (en) 1974-02-28
IT990326B (en) 1975-06-20
FR2197708A1 (en) 1974-03-29
DE2242285A1 (en) 1974-03-21
JPS4953962A (en) 1974-05-25
FR2197708B1 (en) 1977-08-05
LU68313A1 (en) 1975-05-21

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee