Title: Spot blocked thermoplastic film laminate

Abstract: There is provided a laminate of at lest two thermoplastic films which has a plurality of embossed parallel ribs running in at least one direction, said films being blocked together at spaced apart spots along each rib. Such laminate is prepared by passing at least two thermoplastic films in a superimposed and contacting engagement with one another through the nip of a pair of rollers. One roller is provided with a plurality of parallel raised ribs running in one direction and the other roller is provided with a plurality of parallel raised ribs which run in a direction angled to the direction of the ribs on the first roller. At the locations where the ribs on each roller cross at the nip, the films in the laminate are blocked together but otherwise remain unattached. Such laminates have exceptionally high tear strength and added stiffness and are adapted for various uses, including heavy duty bags and grocery sacks.

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Inventors: Clayton, William Joseph (Fairport, NY, US)

Application Number: 525894
Filing Date: 1974-11-21
Publication_date: 1976-08-03
Assignee: Mobil Oil Corporation (New York, NY)
Primary Class(es): 428/35.2 156/209, 264/284, 428/167, 428/172, 428/195.1
Other Classes:
US Patent Ref:

2633442	Mar, 1953	Caldwell	156/197.
3011930	Dec, 1961	Dworak	161/127.
3081571	Mar, 1963	Dayen et al.	156/272.
3308227	Mar, 1967	Power et al.	264/284.
3466212	Sep, 1969	Clayton et al.	156/272.
3507943	Apr, 1970	Such et al.	264/103.
3516887	Jun, 1970	Jones	156/272.
3743172	Jul, 1973	Ackley et al.	161/131.

Other Refs: 1,094,480

Dec, 1967	UK

Primary Examiner: McCamish, Marion E.
Assistant Examiner: Thibodeau, P. J.
Attorney: Huggett; Charles A., Trigg; Hastings S.