Web stretching apparatus

Details Web stretching apparatus Web stretching apparatus

1975-07-30

1977-09-27

Mackey, Robert R.

Textiles: cloth finishing

Expanding device for textile webs

Biaxial expansion

26 90, 26 94, D06C 300, B29D 724

Patent

active

040501248

ABSTRACT:
An apparatus for longitudinally stretching a web comprising a pair of spaced apart rotatable members. Associated with each member are a plurality of angularly spaced primary clamps, each radially movable outward, during member rotation, from a primary web engaging position, in which the primary clamps initially engage the edges of the web being transported between the members, for longitudinally stretching the clamped web. Further associated with each member is a plurality of angularly spaced secondary clamps, each angularly interposed between primary clamps and radially movable outward during member rotation from a secondary web engaging position, which is spaced radially outward from the primary web engaging position. The secondary clamps engage the intermediate edges of the web extending between primary clamps, thereby minimizing edge scalloping of the web during continued stretching thereof in unison with engaged primary clamps. In one embodiment, biaxial web stretching is effected by locating the rotatable members in diverging, non-parallel planes.

REFERENCES:
patent: 2571355 (1951-10-01), Gardner
patent: 3833973 (1974-09-01), Schwarz
patent: 3902230 (1975-09-01), Schwarz

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