Method and apparatus for shrinking biaxially stretched thermopla

Details Method and apparatus for shrinking biaxially stretched thermopla Method and apparatus for shrinking biaxially stretched thermopla

1993-09-07

1995-03-07

Crowder, Clifford D.

Textiles: cloth finishing

Expanding device for textile webs

Biaxial expansion

26 89, 26 93, 264342RE, D06C 300

Patent

active

053945956

ABSTRACT:
A thermoplastic film web is subjected to a defined shrinking in a treatment apparatus with two mirror-symmetrically arranged tentering chains. For this purpose, each chain is equipped with tentering clamps that have a variable on-center spacing or pitch in the travel direction of the tentering chains, and which additionally are position adjustable in a direction other than the travel direction. The entire clamp body or clamp elements may be position variable in a direction other than the travel direction. In operation, the pitch is first reduced in the inlet and/or heating zone of the treatment apparatus. Simultaneously, the clamping position of the individual clamps or clamping element is changed, e.g. by tilting or lifting. The clamp position change takes up extra film web length resulting from the pitch change, whereby the film web assumes throughout its width a corrugated configuration. Then, the film web is cross-stretched. Then the position of the clamps or clamp elements is changed in the setting zone of the apparatus so that the film web is plane again, whereby the shrinking takes up the corrugations. Then, the clamps release the film web and thereafter the original longer pitch is restored.

REFERENCES:
patent: 3046599 (1962-07-01), Nicholas et al.
patent: 4614011 (1986-09-01), Nicholas et al.
patent: 4637103 (1987-01-01), Hutzenlaub
patent: 4890365 (1990-01-01), Langer
patent: 5265313 (1993-11-01), Rutz

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