GB1120578A - Improvements in the production of porous film - Google Patents

Improvements in the production of porous film

Info

Publication number
GB1120578A
GB1120578A GB3984766A GB3984766A GB1120578A GB 1120578 A GB1120578 A GB 1120578A GB 3984766 A GB3984766 A GB 3984766A GB 3984766 A GB3984766 A GB 3984766A GB 1120578 A GB1120578 A GB 1120578A
Authority
GB
United Kingdom
Prior art keywords
perforation
shrinking
porous film
film
round
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
GB3984766A
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.)
WR Grace and Co
Original Assignee
WR Grace 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 WR Grace and Co filed Critical WR Grace and Co
Publication of GB1120578A publication Critical patent/GB1120578A/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
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D28/00—Producing nets or the like, e.g. meshes, lattices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/08—Means for treating work or cutting member to facilitate cutting
    • B26D7/14—Means for treating work or cutting member to facilitate cutting by tensioning the work
    • 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
    • B29C61/02—Thermal shrinking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets

Abstract

Porous film is made by perforating a film of polymeric material which has been stretched biaxially to increase its dimensions by 100-600% at a temperature below its softening temperature, and heating the perforated film to shrink it to approximately the initial area. The polymer may be polypropylene, polyethylene which may have been irradiated, polyvinyl chloride or polyvinylidene chloride. Perforation may be performed on individual sheeting or in pads or stacks of sheets, by a uniformly spaced pattern of punches or by flame perforation. The perforation diameter may be 1.3 mm. and the average maximum dimension of the perforation after shrinking may be 0.2-0.6mm. If the elongation during stretching was the same in both directions, initially round perforations after shrinking will be round; otherwise they will be slits. The holes may permit passage of liquid water before shrinking but not after; the porous film is, however, permeable to water vapour and oxygen.
GB3984766A 1965-09-13 1966-09-06 Improvements in the production of porous film Expired GB1120578A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US48706865A 1965-09-13 1965-09-13

Publications (1)

Publication Number Publication Date
GB1120578A true GB1120578A (en) 1968-07-17

Family

ID=23934273

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3984766A Expired GB1120578A (en) 1965-09-13 1966-09-06 Improvements in the production of porous film

Country Status (1)

Country Link
GB (1) GB1120578A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2417389A1 (en) * 1978-02-15 1979-09-14 Unilever Nv LIQUID PERMEABLE FILM
GB2189126A (en) * 1986-01-29 1987-10-21 Kureha Chemical Ind Co Ltd Thermoplastic resin string or net meat fastening
GB2221691B (en) * 1988-07-15 1992-04-15 Courtaulds Films & Packaging Polymeric films for the storage or packing of plant material
GB2221692B (en) * 1988-07-15 1992-04-15 Courtaulds Films & Packaging Storage and packaging of plant material
GB2329606A (en) * 1997-09-30 1999-03-31 Asahi Optical Co Ltd Method of producing film with through-holes
GB2330106A (en) * 1997-10-09 1999-04-14 Asahi Optical Co Ltd Apparatus for producing film with through-holes
WO1999048653A1 (en) * 1998-03-23 1999-09-30 Deutsche Institute für Textil- und Faserforschung Stuttgart - Stiftung des öffentlichen Rechts Water vapour permeable membrane
US7799254B2 (en) 2000-11-20 2010-09-21 AMCOR Packaging (Australia) Pty Method for the treating films
US8833216B2 (en) 2009-08-10 2014-09-16 Amcor Limited Method and an apparatus for perforating polymeric film

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2417389A1 (en) * 1978-02-15 1979-09-14 Unilever Nv LIQUID PERMEABLE FILM
GB2189126A (en) * 1986-01-29 1987-10-21 Kureha Chemical Ind Co Ltd Thermoplastic resin string or net meat fastening
GB2189126B (en) * 1986-01-29 1990-06-20 Kureha Chemical Ind Co Ltd A method of forming processed meat
GB2221691B (en) * 1988-07-15 1992-04-15 Courtaulds Films & Packaging Polymeric films for the storage or packing of plant material
GB2221692B (en) * 1988-07-15 1992-04-15 Courtaulds Films & Packaging Storage and packaging of plant material
GB2329606B (en) * 1997-09-30 2002-12-11 Asahi Optical Co Ltd Method of producing film with through-holes
GB2329606A (en) * 1997-09-30 1999-03-31 Asahi Optical Co Ltd Method of producing film with through-holes
FR2768962A1 (en) * 1997-09-30 1999-04-02 Asahi Optical Co Ltd PROCESS FOR PRODUCING FILM COMPRISING THROUGH HOLES
US6715387B2 (en) 1997-09-30 2004-04-06 Pentax Corporation Producing method of film with through-holes
FR2771672A1 (en) * 1997-09-30 1999-06-04 Asahi Optical Co Ltd PROCESS FOR PRODUCING FILM COMPRISING THROUGH HOLES
FR2771671A1 (en) * 1997-09-30 1999-06-04 Asahi Optical Co Ltd PROCESS FOR PRODUCING FILM COMPRISING THROUGH HOLES
US6684744B2 (en) 1997-09-30 2004-02-03 Pentax Corporation Producing method of film with through-holes
FR2769538A1 (en) * 1997-10-09 1999-04-16 Asahi Optical Co Ltd DEVICE FOR MANUFACTURING A FILM HAVING THROUGH HOLES
US6296469B1 (en) 1997-10-09 2001-10-02 Asahi Kogaku Kogyo Kabushiki Kaisha Producing apparatus of film with through-holes
GB2330106B (en) * 1997-10-09 2001-08-01 Asahi Optical Co Ltd Apparatus for producing film with through-holes
GB2330106A (en) * 1997-10-09 1999-04-14 Asahi Optical Co Ltd Apparatus for producing film with through-holes
WO1999048653A1 (en) * 1998-03-23 1999-09-30 Deutsche Institute für Textil- und Faserforschung Stuttgart - Stiftung des öffentlichen Rechts Water vapour permeable membrane
US7799254B2 (en) 2000-11-20 2010-09-21 AMCOR Packaging (Australia) Pty Method for the treating films
US8833216B2 (en) 2009-08-10 2014-09-16 Amcor Limited Method and an apparatus for perforating polymeric film

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