Method and apparatus for producing tubular plastic films
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United States of America Patent
Stats
-
Nov 10, 1981
Grant Date -
N/A
app pub date -
Dec 19, 1979
filing date -
Dec 25, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for producing tubular plastic films having extremely small variation of flat width in stabilized manner is provided. Said apparatus comprises a blower, a valve for controlling the amount of air, an air reservoir, a connecting pipe for connecting these blower, valve and air reservoir and another connecting pipe which connects said reservoir to the inside of a bubble formed on the tip end of a mold fixed to the outlet of an extruder through said mold to feed or discharge the air into the inside of said bubble continuously in a non-step manner, thereby to keep the inside pressure of said bubble uniform.
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