B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/523, 18/777
B29D 7/00 (2006.01) B29C 47/06 (2006.01) B29C 49/22 (2006.01) B65D 1/02 (2006.01) B65D 65/40 (2006.01)
Patent
CA 1090971
ABSTRACT OF THE DISCLOSURE There is disclosed a new process for preparing coupled and coextruded multilayer articles (consisting of two or more layers) made of thermoplastic materials, and closed-surface bodies comprising the same. The process comprises (a) feeding, to an extruder connected with a coextru- sion head, a polyvinyl alcohol having a high degree of hydrolysis mixed with an aqueous mixture of plasticizing compounds and heated under pres- sure to bring it to the plastisol state; (b) subjecting the plastisol polyvinyl alcohol to rapid decompression with simultaneous venting of the evolved vapors, before it enters the coextrusion head and while it is at a temperature at least equal to, and preferably higher than, the temperature of the coextrusion head; (c) separately feeding at least one other thermo- plastic polymer to the same coextrusion head; (d) adjusting the temperature of the polymers, after contact thereof, so that the temperature of the polyvinyl alcohol is at least equal to, and pre- ferably higher than, the temperature of the other coextruded polymer or polymers; (e) adjusting the flow rate of the polymers so that the outflow linear velocities thereof are equal or differ no more than + 10%; and (f) molding the coextruded article leaving the coextru- sion head into a manufactured article.
271812
Ortolani Leone
Ranalli Franco
Tisi Quinto
Montedison S.p.a.
Ortolani Leone
Stewart & Kolash Ltd
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