Plastic article or earthenware shaping or treating: apparatus – Continuous filament forming or film casting means with...
Reexamination Certificate
2004-03-30
2009-06-02
Davis, Robert B (Department: 1791)
Plastic article or earthenware shaping or treating: apparatus
Continuous filament forming or film casting means with...
C264S288400
Reexamination Certificate
active
07540731
ABSTRACT:
The device (2) comprises four drawing cylinders (6, 7, 8, 9) on which the film (5) passes and which are associated with press cylinders (13, 21, 26), comprising: a first drawing cylinder (6) having a fixed axis (10), a second drawing cylinder (7) having a fixed axis (12) which is offset in relation to the previous one, a third drawing cylinder (8) whose position is adjustable and a fourth drawing cylinder (9) having a fixed axis (25). Said cylinders (6A9) are rotationally driven at differentiated speeds, such that a first drawing stage is formed between the second cylinder (7) and the third cylinder (8), whereby the drawing distance (D) is preferably adjustable, and a second drawing stage is formed between the third cylinder (8) and the fourth cylinder (9). The invention is used for the longitudinal drawing of synthetic films.
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Darlet Marchante Technologies S.A.
Davis Robert B
Leyson Joseph
Oliff & Berridg,e PLC
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