GB825897A - Apparatus for producing flattened tubular film of thermoplastic organic polymeric material - Google Patents

Apparatus for producing flattened tubular film of thermoplastic organic polymeric material

Info

Publication number
GB825897A
GB825897A GB24109/57A GB2410957A GB825897A GB 825897 A GB825897 A GB 825897A GB 24109/57 A GB24109/57 A GB 24109/57A GB 2410957 A GB2410957 A GB 2410957A GB 825897 A GB825897 A GB 825897A
Authority
GB
United Kingdom
Prior art keywords
film
rolls
flattened
width
tubular film
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
GB24109/57A
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.)
Lonza Electric and Chemical Works Ltd
Original Assignee
Lonza Electric and Chemical Works Ltd
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 Lonza Electric and Chemical Works Ltd filed Critical Lonza Electric and Chemical Works Ltd
Publication of GB825897A publication Critical patent/GB825897A/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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/02—Bending or folding
    • B29C53/10—Bending or folding of blown tubular films, e.g. gusseting
    • 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
    • B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
    • 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0063—Cutting longitudinally
    • 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

Landscapes

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

Abstract

In film-making apparatus of the type comprising an annular die through which heated thermoplastic organic material is extruded to form a tubular air-inflated film and a pair of coacting driven rolls through the nip of which <PICT:0825897/IV (a)/1> the tubular film is passed and thereby flattened, the distance between the face of the annular die and the axis of the rolls is at least and preferably more than five times the width of the flattened film, the rolls are of hard material, the periphery of one or of each of the rolls is sheathed with resilient material, and the sheathed rolls are of an equal diameter which is greater than the width of the flattened film. As shown, the resilient sheath of each roll 3, 4 is built up of two separate layers, namely an inner coating 5a and 6a respectively of continuous homogeneous natural or synthetic rubber free from voids and an outer coating 5b and 6b respectively of aerated or foamed polythene. The nip S between the cores of the rolls is made so narrow that the sheaths become powerfully compressed and reduced to less than half their original thickness. At the same time, the easily-compressible outer coatings 5b, 6b transmit the resulting deformation pressure to the relatively incompressible inner coatings 5a, 6a, which yield to this pressure sideways in the direction of the double arrow P and thereby draw the flattened tubular film 2 tight in the direction of its width. By this combined action, the film is laid completely flat free from wrinkles and folds.
GB24109/57A 1956-07-31 1957-07-30 Apparatus for producing flattened tubular film of thermoplastic organic polymeric material Expired GB825897A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH825897X 1956-07-31

Publications (1)

Publication Number Publication Date
GB825897A true GB825897A (en) 1959-12-23

Family

ID=4539932

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24109/57A Expired GB825897A (en) 1956-07-31 1957-07-30 Apparatus for producing flattened tubular film of thermoplastic organic polymeric material

Country Status (5)

Country Link
BE (1) BE559641A (en)
CH (1) CH347351A (en)
FR (1) FR1180252A (en)
GB (1) GB825897A (en)
NL (1) NL106209C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2815287A1 (en) * 2000-10-18 2002-04-19 Sedepro MANUFACTURE OF A STRIP BY EXTRUSION OF A TUBE THEN FLATTENING THE TUBE

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2815287A1 (en) * 2000-10-18 2002-04-19 Sedepro MANUFACTURE OF A STRIP BY EXTRUSION OF A TUBE THEN FLATTENING THE TUBE
EP1199148A1 (en) * 2000-10-18 2002-04-24 Société de Technologie Michelin Manufacturing a strip by extruding a tube and then flattening said tube
US6666940B2 (en) 2000-10-18 2003-12-23 Michelin Recherche Et Technique S.A. Manufacture of a strip by extrusion of a tube then flattening the tube
US6957677B2 (en) 2000-10-18 2005-10-25 Michelin Recherche Et Technique S.A. Manufacture of a strip by extrusion of a tube then flattening the tube

Also Published As

Publication number Publication date
CH347351A (en) 1960-06-30
FR1180252A (en) 1959-06-03
NL106209C (en) 1900-01-01
BE559641A (en) 1900-01-01

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