GB1402963A - Tubular plastics films - Google Patents

Tubular plastics films

Info

Publication number
GB1402963A
GB1402963A GB780073A GB780073A GB1402963A GB 1402963 A GB1402963 A GB 1402963A GB 780073 A GB780073 A GB 780073A GB 780073 A GB780073 A GB 780073A GB 1402963 A GB1402963 A GB 1402963A
Authority
GB
United Kingdom
Prior art keywords
tube
roller
band
cooling
bags
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
GB780073A
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.)
British Cellophane Ltd
Original Assignee
British Cellophane 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 British Cellophane Ltd filed Critical British Cellophane Ltd
Priority to GB780073A priority Critical patent/GB1402963A/en
Publication of GB1402963A publication Critical patent/GB1402963A/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
    • B29C48/03—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
    • 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
    • B29C48/0018—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
    • B29C48/001—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
    • 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

Abstract

1402963 Making carrier bags BRITISH CELLOPHANE Ltd 15 Feb 1974 [16 Feb 1973] 7800/73 Heading A4G [Also in Division B5] A seamless tubular film of a synthetic thermoplastic material, especially polyethylene polypropylene or poly(vinyl chloride), having at least one band of quarter thickness than the remainder of the wall of the film is formed by extrusion through an annular orifice to form a tube, inflating the tube by a gas under pressure and contacting at least one cooled lubricated roller with a portion of the molten tube rotating said roller in such a direction that at the area of contact the roller surface is moving in a direction opposite to the movement of the tube so as to solidify that portion and inhibit further thinning relative to other circumferential portions of the tube and cooling the tube. In Figs. 1 and 2, tube 3 is extruded through a die 2, collapsed by a pair of driven nip rollers 4 and air under pressure is admitted by pipe 5 to give a tube of predetermined diameter. The circumferential zone of solidification is indicated at 6 and the height of such line is determined by the position of the cooling ring 7. Between the frost line 6 and the ring 7 is positioned a rotatable bias roller 8 having a width corresponding to the width of a thickened band required to be formed in tube 3 and caused to rotate in contact with the tube. A stream of cooling liquid especially water, is directed on to the roller 8 and excess liquid collected in a trough 10. A thickened strip 12 is formed. In evaporating the lubricant assists the cooling of the tube 3. In Fig. 5 a modification is shown using two rollers 21 and 22 to give a tube as shown in Fig. 6. Fig. 4 shows a single roller which may be used in place of two side by side rollers 70 so as to give a crease line when the tube is collapsed. A laminate is formed by collapsing the tube (especially as shown in Fig. 6) followed by hot calendering. Carrier bags are formed by collapsing the tube 3 (now tubular film 1) in Figs. 1 and 2 by the nip rollers 4 at such a position that a crease line passes centrally through the band 12 slitting through the crease line (Fig.3) at the band 12 with a knife 15, forming transverse seals 16, at spaced intervals, forming cut-out hand holes 17 in the thickened edges 18 at the mouth of the bags 14 and then cutting off individual bags by cutting centrally through the seals 16.
GB780073A 1973-02-16 1973-02-16 Tubular plastics films Expired GB1402963A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB780073A GB1402963A (en) 1973-02-16 1973-02-16 Tubular plastics films

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB780073A GB1402963A (en) 1973-02-16 1973-02-16 Tubular plastics films

Publications (1)

Publication Number Publication Date
GB1402963A true GB1402963A (en) 1975-08-13

Family

ID=9839990

Family Applications (1)

Application Number Title Priority Date Filing Date
GB780073A Expired GB1402963A (en) 1973-02-16 1973-02-16 Tubular plastics films

Country Status (1)

Country Link
GB (1) GB1402963A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4781880A (en) * 1987-02-11 1988-11-01 Robbins Edward S Iii Method of forming plastic ribbed enclosure
US4816316A (en) * 1987-02-11 1989-03-28 Robbins Edward S Iii Ribbed sheet

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4781880A (en) * 1987-02-11 1988-11-01 Robbins Edward S Iii Method of forming plastic ribbed enclosure
US4816316A (en) * 1987-02-11 1989-03-28 Robbins Edward S Iii Ribbed sheet

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee