Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With casting – plastic molding – or extruding means
Patent
1976-11-22
1978-01-17
Weston, Caleb
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With casting, plastic molding, or extruding means
425378R, 425379R, 425463, B29D 302, B29D 304, B29D 308
Patent
active
040690920
ABSTRACT:
Odor elimination process for plastic film in which at least two extruded plastic films are combined outside of the die. The process utilizes a valve adapting a single extruder to supply two melt streams to a dual melt chamber dual slot die. One melt chamber of the dual slot die is heated to a temperature below the temperature of oxidation of the resin of the thermoplastic material extruded through the die. The other melt chamber is heated above the oxidation temperature of the thermoplastic material extruded through the die, to increase the adhesive qualities of the extruded film to effectively bond with the thermoplastic material heated to a low temperature. The two films are then combined and the high temperature film is sandwiched between the low temperature film and a substrate, trapping the odor of the high temperature film. In a modified form of the invention, the film heated to a high temperature is passed through a tortuous path and heated to its high temperature while passing through this path.
REFERENCES:
patent: 3320636 (1967-05-01), Corbett
patent: 3702226 (1972-11-01), Kim et al.
patent: 3743460 (1973-07-01), Woolridge
patent: 3797987 (1974-03-01), Marion
patent: 3802825 (1974-04-01), Upmeier
patent: 3822108 (1974-07-01), Mihalik
patent: 3826602 (1974-07-01), Shaffer et al.
Penrod William R.
Zink Stanley C.
Beloit Corporation
Gill Michael L.
Mathews Gerald A.
Veneman Dirk J.
Weston Caleb
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