Process for producing a plastic laminate of low density polymeri

Details Process for producing a plastic laminate of low density polymeri Process for producing a plastic laminate of low density polymeri

1985-12-16

1987-12-29

Dawson, Robert A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

156205, 156210, 1563082, 156322, 428178, 428182, 428213, 4283148, 4283199, B32B 328

Patent

active

047160691

ABSTRACT:
A process and apparatus are disclosed for producing a plastics laminate material comprising a lamina of low density foamed polymeric material such as a non-cross linked polyethylene foam and a lamina of high density non-foamed polymeric material such as high density polyethylene, wherein the low density lamina is of at least 50 times greater thickness than the high density lamina, characterised in that the individual laminae are physically bonded between nip rollers at critical conditions of elevated pressure (e.g. 40 to 50 p.s.i.) and temperature (e.g. 125.degree. C. to 150.degree. C.) to bring about a very strong bond such that the bonded laminae do not readily peel apart. Temperature is particularly critical and should be brought close to and not substantially above the tackifying temperature of the low density foamed material. Air is preferably entrapped between the laminae during the process. The high density lamina is preferably pre-heated to increase its malleability prior to bonding with the low density lamina. The finished laminate may be used as a protective packaging material in sheet or bag form.

REFERENCES:
patent: 4597818 (1986-07-01), Aoyama et al.

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