Stock material or miscellaneous articles – Hollow or container type article – Nonself-supporting tubular film or bag
Patent
1987-12-31
1990-07-31
Seidleck, James
Stock material or miscellaneous articles
Hollow or container type article
Nonself-supporting tubular film or bag
428 354, 428172, 428220, 428221, 428500, 428518, B32B 108, B32B 2730
Patent
active
049449729
ABSTRACT:
Apparatus and method for fabricating films, especially films containing vinylidene chloride copolymer, wherein the process is susceptible of continued operation over an extended period of time greater than a few days. The process typically can operate for at least 2 weeks between shut downs for cleaning the die. The apparatus comprises a coextrusion feedblock 20 in combination with an annular extrusion die 10 having a crosshead mandrel 11, and means for conveying the exit stream 24 from the feedblock to the die. The particular apparatus combination especially reduces the rate of carbon buildup in the extrusion apparatus during extrusion of VDC-copolymer, such that the extrusion process can be operated for a longer time between shutdowns for cleaning and maintenance of the die. The invention further includes novel tubular films 32 made with the apparatus and methods of the invention, and packages made from the films. In general, the method of the invention produces tubular films having more layers than the annular extrusion die has annular orifices.
REFERENCES:
patent: 3477099 (1969-11-01), Lee et al.
patent: 3558330 (1971-01-01), Widiger et al.
patent: 4042661 (1977-08-01), Cook
patent: 4044187 (1977-08-01), Kremkau
patent: 4265693 (1981-05-01), Nishimoto
patent: 4379117 (1983-04-01), Baird, Jr. et al.
patent: 4478670 (1984-10-01), Heyse et al.
patent: 4643927 (1987-02-01), Luecke et al.
patent: 4714638 (1987-12-01), Lustig et al.
patent: 4723902 (1988-02-01), Erickson
patent: 4755402 (1988-07-01), Oberle
patent: 4804510 (1989-02-01), Luecke et al.
patent: 4842791 (1989-06-01), Gould et al.
American National Can Company
Audet Paul R.
Seidleck James
Wilhelm Thomas D.
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