Package making – Interrelated or safety controls
Patent
1977-08-08
1978-08-15
Spruill, Robert Louis
Package making
Interrelated or safety controls
53 28, 93 35R, 156324, B65B 912, B65B 4116
Patent
active
041062612
ABSTRACT:
A composite web comprised of free standing (non-blocked) plies is prepared with precisely even linear amounts of each ply, based on the principle of using a carrier ply of preferably heavy gauge plastic film. The carrier ply under controlled tension, is trained about the surface of revolution of a supply roll of a reinforcing scrim material. As the carrier ply is advanced, an exactly matched linear amount of scrim is deposited on one surface of the carrier ply, irrespective of the mismatched elongation properties of the scrim and carrier plies, respectively, and with minimal or no neck-down of the scrim. A liner ply of plastic film can be applied to the opposite side of the scrim using the same principles. The resulting web is ideally suited to be converted into filled, scrim reinforced, plastic bag structures.
REFERENCES:
patent: 2154521 (1939-04-01), Maxfield
patent: 2374128 (1945-04-01), Pinckert
patent: 3061989 (1962-11-01), Newall et al.
patent: 3267822 (1966-08-01), Harrison
patent: 3616130 (1971-10-01), Rogosch et al.
patent: 3661322 (1972-05-01), Norman
Halldorson Burke M.
Spruill Robert Louis
The Dow Chemical Company
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