Method of heat activating top closure panels

Details Method of heat activating top closure panels Method of heat activating top closure panels

1988-08-31

1989-06-13

Spruill, Robert L.

Package making

Methods

Closing package or filled receptacle

53373, 53375, 53379, 53491, 156497, 493134, B65B 5120, B65B 718

Patent

active

048380091

ABSTRACT:
A method of heat activating the interior surfaces of the top closure, fin forming panels of a paperboard carton of the type shown in U.S. Pat. No. 4,732,275 to thereby render their PE coating tacky prior to folding the panels to form the carton top closure. The geometry of the two fin forming panels is such that their interior surfaces require a U-shaped heating pattern, as opposed to heating their entire areas. This U pattern is achieved by a specific hot air jet arrangement on an otherwise conventional nozzle block and by moving the nozzle towards and away from the carton as the carton moves past the nozzle block. The method also includes heating by a second nozzle block, to increase the rate of production of closed cartons. The fin forming panels of the cartons may also be preheated.

REFERENCES:
patent: 3392458 (1968-07-01), Braun
patent: 3789746 (1974-02-01), Martensson
patent: 3825408 (1974-07-01), Farfaglia
patent: 4511426 (1985-04-01), Linner

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