Title: Pedagogic thermal pulse sealing apparatus

Abstract: A pedagogic sealing apparatus for seaming thermoplastic layers includes a sealing station and a trimming station. The sealing station includes a movable platen jaw which compresses the layers against a fixed jaw. Current flow through a resistance ribbon in the fixed jaw elevates the temperature of the layers to provide a fused seam between the layers. An indicator is provided to apprise the student of the termination of a preselected duration heating pulse and the commencement of a cooling cycle. The platen jaw is heated by a resistance ribbon optionally actuated conjunctively with the fixed jaw ribbon to seal layers which require additional heat to fuse their interface.

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Inventors: Natter, Howard

Application Number: 564411
Filing Date: 1975-04-02
Publication_date: 1977-03-01
Assignee:
Primary Class(es): 156/510 83/544, 83/607, 156/583.2, D18/34
Other Classes:
US Patent Ref:

884219	Apr, 1908	Scates	83/607.
1511810	Oct, 1924	Gwynn	156/583.
2185985	Jan, 1940	Lund	83/607.
2254374	Sep, 1941	Laukhuff	83/544.
2324751	Jul, 1943	Williams et al.	83/452.
2581977	Jan, 1952	Spalding et al.	156/583.
2802086	Aug, 1957	Fener	156/583.
2927620	Mar, 1960	Elliott	156/583.
3703427	Nov, 1972	Sellers et al.	156/380.

Other Refs:
Primary Examiner: Drummond, Douglas J.
Assistant Examiner:
Attorney: Natter & Natter