Apparatus for sealing film including sealing head with wedge-shaped lower-portion
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United States of America Patent
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Dec 11, 1990
Grant Date -
N/A
app pub date -
Jul 12, 1988
filing date -
Jul 12, 1988
priority date (Note) -
Expired
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Abstract
Apparatus for manufacturing plastic film stock material including a sealing head utilizing heated air for continuous welding of reclosable plastic closure strips of plastic film. The sealing head is an elongated block having tapered walls which form a narrow bottom edge. The edge is curved longitudinally to match the curvature of a cooperating platen to define a small welding gap through which pass plastic webs to be welded. The sealing head includes a plurality of air distribution manifolds interconnected by passageways to provide a tortuous path for air flowing through the head from an inlet to an elongated, narrow exit slot formed at the bottom edge of the head. Multiple sealing heads are mounted on a carrier frame for positioning adjacent the platen to produce elongated welds to secure two-piece closure strips to a plastic web.
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