Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1990-11-01
1991-12-24
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
264174, 26421124, 264236, 264347, 425113, B29C 4706
Patent
active
050750615
ABSTRACT:
Polymeric material is plastified in an extruder and is then divided into a major part and a minor part. Either the major part or (more often) the minor part is modified by a chemical reaction, such as grafting (any necessary ingredients being added, if not already present). The major and minor parts are then recombined in an extrusion head so that the modified and unmodified materials form distinct parts of the product. In this way, a single extruder can be used to make, for instance, a product with surface characteristics modified by grafting, wire-covering with only a surface layer crosslinked, or heat-sealable crosslinked packaging film.
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patent: 4793957 (1988-12-01), Lovegrove
patent: 4814130 (1989-03-01), Shiromatsu et al.
patent: 4857250 (1989-08-01), Gale et al.
BICC Public Limited Company
Thurlow Jeffery
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