Apparatus for the treatment and biaxial stretching and axial shrinking of thermoplastic film web
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United States of America Patent
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Aug 30, 1994
Grant Date -
N/A
app pub date -
Oct 21, 1993
filing date -
Oct 22, 1992
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A thermoplastic film stretching apparatus includes a first and a second separate transport chain system including the respective guide tracks and tentering clamps. The tentering clamps are guided without the conventional chain plate connections. The first chain transport system performs the tentering clamp transport from the inlet of the system to the setting zone of the system, where the tentering clamps are released by the first transport chain system and taken over by the second transport chain system. The transport of the tentering clamps by the second system through the setting zone, the cooling zone, and along the way to the outlet zone of the film stretcher, takes place with a smaller transport speed than that of the first transport system. The speed difference between the first and second transport chains is the measure for the film shrinkage to be imposed onto the thermoplastic film.
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