Stretching machine
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 9, 1993
Grant Date -
N/A
app pub date -
Aug 23, 1991
filing date -
Aug 23, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pair of stretching pulleys are rotatably mounted on a pair of support plates within a housing. A belt is wound around the upper part of the stretching pulley and a number of turn pulleys. A film introduced onto the stretching pulley is held between the belt and the stretching pulley and is transferred. Air flow generated by a fan and heated with a heater is blown against the film through a louver and circulates through bellows mounted to the housing to return to the fan. The stretching pulley is partially cooled in a water bath. The support plates are rotatably connected to screw shafts, thereby changing a distance and angle between the plates. The stretch width or stretch ratio of the film is thus adjusted with the change of the distance and angle.
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