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GB2020225A - Manufacture of Film From Partially crosslinked Polyethylene - Google Patents

Manufacture of Film From Partially crosslinked Polyethylene

Info

Publication number
GB2020225A
GB2020225A GB7911546A GB7911546A GB2020225A GB 2020225 A GB2020225 A GB 2020225A GB 7911546 A GB7911546 A GB 7911546A GB 7911546 A GB7911546 A GB 7911546A GB 2020225 A GB2020225 A GB 2020225A
Authority
GB
United Kingdom
Prior art keywords
film
polyethylene
partially crosslinked
manufacture
crosslinking
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.)
Granted
Application number
GB7911546A
Other versions
GB2020225B (en
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.)
DuPont Canada Inc
Original Assignee
DuPont Canada Inc
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 DuPont Canada Inc filed Critical DuPont Canada Inc
Priority to GB7911546A priority Critical patent/GB2020225B/en
Publication of GB2020225A publication Critical patent/GB2020225A/en
Application granted granted Critical
Publication of GB2020225B publication Critical patent/GB2020225B/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
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; 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
    • 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
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/10—Thermosetting resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2301/00—Use of unspecified macromolecular compounds as reinforcement
    • B29K2301/10—Thermosetting resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0081—Tear strength

Landscapes

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

Abstract

A blown film process is disclosed, in which polyethylene film with a reduced transverse direction tear strength is produced. The process has a blow-up ratio in the range of 1.2:1 to 4:1 and a MD draw down ratio in the range of 2 to 60. The polyethylene is partially crosslinked and extruded into a film between 10 ???m and 100 ???m thick. The polyethylene before crosslinking has a density of between 0.940 g/cm<3> and 0.970 g/cm<3>, and a melt index of between 0.2 g/10 min and 15.0 g/10 min. The crosslinking should be sufficient to cause the film to have a substantial reduction in the Elmendorf tear strength in the transverse direction as against a film made under the same conditions using the same polyethylene not crosslinked. Any known crosslinking method may be used, examples of methods and sufficient doses are disclosed, as are preferred ranges for other variables.
GB7911546A 1978-04-18 1979-04-03 Manufacture of film partially crosslinked polyethylene Expired GB2020225B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7911546A GB2020225B (en) 1978-04-18 1979-04-03 Manufacture of film partially crosslinked polyethylene

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1520278 1978-04-18
GB7911546A GB2020225B (en) 1978-04-18 1979-04-03 Manufacture of film partially crosslinked polyethylene

Publications (2)

Publication Number Publication Date
GB2020225A true GB2020225A (en) 1979-11-14
GB2020225B GB2020225B (en) 1982-07-21

Family

ID=26251128

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7911546A Expired GB2020225B (en) 1978-04-18 1979-04-03 Manufacture of film partially crosslinked polyethylene

Country Status (1)

Country Link
GB (1) GB2020225B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1426162A1 (en) * 2002-12-05 2004-06-09 Alcan Packaging Italia S.r.l. Tearable plastic film particularly for flexible packagings

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108610759B (en) * 2017-01-03 2020-05-15 国家能源投资集团有限责任公司 Preparation method of crosslinked polyethylene coating film and composite material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1426162A1 (en) * 2002-12-05 2004-06-09 Alcan Packaging Italia S.r.l. Tearable plastic film particularly for flexible packagings

Also Published As

Publication number Publication date
GB2020225B (en) 1982-07-21

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Legal Events

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