Adhesive bonding and miscellaneous chemical manufacture – Delaminating processes adapted for specified product – Delaminating in preparation for post processing recycling step
Patent
1974-10-16
1976-04-20
Coan, James F.
Adhesive bonding and miscellaneous chemical manufacture
Delaminating processes adapted for specified product
Delaminating in preparation for post processing recycling step
93 19, 93 1F, 93 94R, 156203, 156466, 156497, B31B 172, B31B 2360
Patent
active
039510506
ABSTRACT:
The invention provides a continuous process for producing tubes from sheeting coated on at least one face with a heat sealable composition that melts at a lower temperature than the sheeting itself. The process essentially comprises the steps of supplying the coated sheeting to a folding means, folding the sheeting longitudinally so that its edges are in juxtaposition in the same plane, supplying a sealing ribbon coated with a heat sealable composition of lower melting temperature than the ribbon itself, the composition being heat sealable to the composition coating the sheeting, and directing the sealing ribbon to be centrally over the juxtaposed edges of the folded sheeting, the coated surface of the sealing ribbon being adjacent to that of the folded sheeting, directing hot air towards the line of contact of the coated surfaces of the sheeting and the sealing ribbon in volume and temperature sufficient to soften the coatings of both the ribbon and the folded sheeting in the vicinity of the edges of the folded sheeting, immediately pressing the ribbon to the folded sheeting with sufficient pressure to form a seal, and cutting the tube so formed into predetermined lengths. Apparatus to implement the process is also disclosed.
REFERENCES:
patent: 2372737 (1945-04-01), Phillips, Jr.
patent: 2490930 (1949-12-01), Thompson
patent: 2614953 (1952-10-01), Anglada
patent: 3029175 (1962-04-01), Stenqvist
patent: 3837972 (1974-09-01), Schuster
patent: 3850716 (1974-11-01), Podvin
Coan James F.
Du Pont of Canada Ltd.
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