Methods for producing multi-layer foamed sheets

Details Methods for producing multi-layer foamed sheets Methods for producing multi-layer foamed sheets

2005-04-12

2005-04-12

Kuhns, Allan R. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

C264S173120, C264S173160, C264S920000

Reexamination Certificate

active

06878318

ABSTRACT:
The invention provides, as a method for producing a multi-layer foamed sheet whose scale-like appearance has been improved by means of a multi-layer circular die coextrusion method, a method for producing a multi-layer foamed sheet having foam layers and non-foam layers by a multi-layer circular die coextrusion method which is a method for producing a multi-layer foamed sheet wherein the shear stress at the interface of each layer is 5000 Pa or higher and not higher than 50000 Pa, a method for producing a multi-layer foamed sheet wherein the resin of said non-foam layer is a linear propylenic resin having a melt flow rate of 5 to 30 g/10 minutes, and a method for producing a multi-layer foamed sheet wherein the resin of said foam layer is a propylenic resin whose melt tension (MT) at 190° C. and melt flow rate (MFR) at 230° C. satisfy the following equation A:in-line-formulae description="In-line Formulae" end="lead"?MT≧7.52×MFR(−0.576)  [Equation A]in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 6562276 (2003-05-01), Shelby et al.
patent: 1 075 921 (2001-02-01), None
patent: 7-16971 (1995-01-01), None
patent: 2001-113655 (2001-04-01), None

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