Stock material or miscellaneous articles – Hollow or container type article – Cellular material derived from plant or animal source
Patent
1980-07-18
1982-02-16
Ives, P.
Stock material or miscellaneous articles
Hollow or container type article
Cellular material derived from plant or animal source
428213, 428163, 428166, 428167, 264519, 428323, 428 36, B65D 8530
Patent
active
043159630
ABSTRACT:
A process and apparatus for producing a ribbed pattern on extruded film by differential cooling of the film during its stretching process. The film is extruded through a tubular film die, stretching as it leaves the die. Cooling mechanisms rotate about the tube as it is being extruded to define a large plurality of narrow strips on the melt as it is being extruded. The film is fixed in space to maintain a close proximity to the cooling mechanisms in order to achieve sharply defined ribs. A cross-ribbed pattern can be obtained by counter-rotating the cooling mechanisms. Increased tear strength is imparted to the film without increasing the amount of resin necessary to make the film. Such tube can be formed into high strength film products such as trash bags and the like.
REFERENCES:
patent: 3210234 (1965-10-01), Baskin et al.
patent: 3904465 (1975-09-01), Haase et al.
patent: 3973063 (1976-08-01), Clayton
patent: 3976733 (1976-08-01), Havens
patent: 4265853 (1981-05-01), Havens
Hessenaur, Jr. Lloyd E.
Ives P.
The Dow Chemical Co.
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