Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1990-09-07
1992-05-05
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
264245, 4251311, 425132, B29C 4706
Patent
active
051105306
ABSTRACT:
Striped films of the invention can have two or more preferably polymeric layers, of which at least one continuous or discontinuous layer includes a pigmented resin. The striped film is produced by modifying conventional coextrusion dies to restrict the flow of a pigmented melt stream. The result is a striped film useful for identifying the contents of a package made from the film, tamper evidence, counterfeit protection and verification of properties. The stripes can be of one or more colors, and vary in width and spacing. The pigment can be a material visible in ordinary light, or a material invisible in ordinary light but visible in e.g. ultraviolet light.
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5-Layer Blown Film Lines Jul.-1981 Reifenhauser.
Excerpt Michaeli, Mar.-1984 Extrusion Dies, pp. 268-269 Hanser Publishing, Munich.
Lee, Jr. William D.
Quatt Mark B.
Skord Jennifer L.
Thurlow Jeffery
W. R. Grace & Co.,-Conn.
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