Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Of varying cross-sectional area or with intermittent...
Patent
1989-11-13
1991-04-30
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Of varying cross-sectional area or with intermittent...
264171, 2641771, 26417716, 26417719, 425465, B29C 4714
Patent
active
050116428
ABSTRACT:
An extruded article is provided having a base element, and rib element attached to the base element along its entire length. The rib element is narrower at its attachment end than at its free end, and is undulated. The article is formed by extruding an extrudable plastic mass having a conformable state and a nonconformable state. The extrusion rate of the free end of the rib element is sufficiently faster than that of the base element causing the free end of the rib element to undulate without distortion as the structure is extruded. The plastic mass is then converted to the nonconformable state while maintaining the undulation in the free end of the rib element.
REFERENCES:
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Pawlikowski, Jr. Walter W.
Welygan Dennis G.
Zemke Ronald O.
Griswold Gary L.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Sorensen Andrew D.
Thurlow Jeffery
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