Apparatus for physically conditioning plastic tape

Details Apparatus for physically conditioning plastic tape Apparatus for physically conditioning plastic tape

1976-06-04

1977-04-12

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

Shaping means and subsequent product treatment means

425297, 425305R, 425308, 425363, B29C 2500, B29C 1700, B29D 702, B29D 724

Patent

active

040172511

ABSTRACT:
The invention comprises a process and apparatus for applying conductive heat to plastic film tapes in a stabilizing unit containing a plurality of rollers forming sets of rollers. Each roller in the set rotates progressively slower than the preceding adjacent roller. Some rollers have heated surfaces to reheat and heat soften the plastic film. Some rollers have cold surfaces to set the film. The progressively slower rotation of the rollers allows the film to release the stresses imparted to the film during the initial stretching operation. In so doing, the molecules rearrange themselves to provide an increased degree of tensile strength in the tapes. The reheating of the film causes shrinkage. However, the progressively slower rotation of adjacent rollers controls the degree of shrinkage and holds the shrinkage to a minimum.

REFERENCES:
patent: 1975132 (1934-10-01), Van Derhoef
patent: 2260501 (1941-10-01), Wynd
patent: 3283378 (1966-11-01), Cramton
patent: 3319294 (1967-05-01), Borsvold et al.
patent: 3333032 (1967-07-01), Dickinson
patent: 3920372 (1975-11-01), Katogi
patent: 3927927 (1975-12-01), Chill et al.

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