Process for forming peelable seals

Details Process for forming peelable seals Process for forming peelable seals

1975-12-15

1977-10-25

Van Horn, Charles E.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156306, 156322, 264284, 264345, 428194, 428198, 428296, A61B 1902

Patent

active

040554546

ABSTRACT:
A process for forming peelable seals between a layer of spunbonded olefin material and an unsupported film of polyethylene or to a supported film of a laminated or coated backing, such as polyethylene coated Mylar, to form a peel-seal packet, container or pouch. The spunbonded olefin material is first pretreated with a heated die in the areas that are to form the peel-seal with heat and pressure suitable to render uniform surface characteristics to the spunbonded olefin. The heat, pressure and dwell time of the pretreatment are sufficient to eliminate the high spots and internal weaknesses of the spun-bonded olefin material following which a web of synthetic polymeric material having a heat sealable surface may be peelably sealed by a conventional heat sealing method.

REFERENCES:
patent: 3532589 (1970-10-01), David
patent: 3542634 (1970-11-01), Such et al.
patent: 3575793 (1971-04-01), Paisley
patent: 3607519 (1971-09-01), Beyer et al.
patent: 3660200 (1972-05-01), Anderson et al.
patent: 3862869 (1975-01-01), Peterson et al.
patent: 3926311 (1975-12-01), Laske

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