Coextrusion apparatus and process
AssigneeP.C.E. Corp.
InventorPeter F. Cloeren
Life of this patent
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Abstract
The present invention provides a novel coextrusion apparatus including, in a preferred embodiment, a die within a feedblock. The apparatus includes edge seam-forming channels, which provide a core layer sandwiched within adjacent layers having integrally seamed edges. Also provided in a unique process for sandwiching a core stream within adjacent layers.
Claims17
A coextrusion apparatus comprising
- (a) a main body comprising a first flow channel and a second flow channel, each of which comprises a land channel;
- (b) a die body disposed between said first flow channel and second flow channel, said die body comprising a transverse flow-providing chamber and, in fluid communication therewith, an exit channel;
- wherein said main body has a first wall which cooperates with a first face of said die body to form the land channel of said first flow channel, and has a second wall which cooperates with a second face of said die body to form the land channel of said second flow channel;
- and wherein each land channel has a width less than that of its respective flow channel;
- and
- (c) at each edge of, and in fluid communication with, each of said land channels, an edge seam-forming channel, pairs of which each converge at a locus of convergence located upstream of a place of convergence of said land channels and said exit channel of said die.
A coextrusion apparatus comprising
- (a) a main body comprising a first flow channel and a second flow channel, each of which comprises a land channel;
- (b) a die body disposed between said first flow channel and second flow channel, said die body comprising a transverse flow-providing chamber and, in fluid communication therewith, an exit channel;
- wherein said main body has a first wall which cooperates with a first face of said die body to form the land channel of said first flow channel, and has a second wall which cooperates with a second face of said die body to form the land channel of said second flow channel;
- and wherein each land channel has a width less than that of its respective flow channel;
- (c) at each edge of, and in fluid communication with, each of said land channels, an edge seam-forming channel, pairs of which each converge at a locus of convergence located upstream of a place of convergence of said land channels and said exit channel of said die;
- and
- (d) adjustable distribution pin means for profiling, located proximate to said place of convergence.
A coextrusion process for sandwiching a core stream between a first stream and a second stream, said process comprising transversely spreading a core stream to a certain width, and a first stream and a second stream each to a width greater than said certain width;
- thereafter converging edges of said first stream with edges of said second stream, to form seamed edges that prevent lateral leakage of said core stream;
- and then converging said core stream, said first stream and said second stream to form a melt-laminate sandwich.
Dependencies are inferred from the claim text.