发明名称 |
APARATO Y METODO PARA RESTRINGIR LA EXPANSION DE UN TUBO GIRATORIO DE MATERIAL EXTRUIDO. |
摘要 |
A constraining structure for an open tube apparatus for continuously producing a rotating elongate strip of material is disclosed. The constraining structure controls expansion of an extruded blown film tube to a desired outer diameter range after the tube is formed. The constraining structure includes a casing positionable around the tube, and an annular sleeve in the casing having a generally cylindrical central passageway adapted to receive the tube to permit movement of the tube along its longitudinal axis in a downline direction. The casing and the sleeve walls define a gas chamber with pressurized gas separate from the passageway. The gas layer along the inner surface of the sleeve is at a sufficiently large pressure to constrain the tube to the desired outer diameter while the tube solidifies and to prevent the tube from contacting the sleeve. |
申请公布号 |
MX9201186(A) |
申请公布日期 |
1992.10.01 |
申请号 |
MX19920001186 |
申请日期 |
1992.03.18 |
申请人 |
MINNESOTA MINING AND MANUFACTURING COMPANY |
发明人 |
STEVEN J. LENIUS;JOHN W. LOUKS;RONALD P. SWANSON;EUGEN WILL |
分类号 |
B29C47/20;B29C47/90;B29C47/92;B29C55/28;B29C69/00;B29D23/00 |
主分类号 |
B29C47/20 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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