Process and apparatus for cutting and sealing multiple plies of

Details Process and apparatus for cutting and sealing multiple plies of Process and apparatus for cutting and sealing multiple plies of

1988-04-11

1989-03-14

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156 66, 156499, 156515, 156518, 156530, 156581, B32B 3118

Patent

active

048121924

ABSTRACT:
A process and apparatus is provided for cutting multiple plies of thermoplastic material having thickened sections, such as defined by cross-sections of matable parts of a zipper closure formed in the material, and for concurrently sealing the severed margins of the material which includes sealing the severed zipper closure portions thereof. The process and apparatus perform the operative steps of: first, preblocking the thickened material adjacent to the zipper closure portions of the material in areas thereof to be severed and sealed; then, applying heat and pressure to the thickened material and remaining sections of the material in those areas to render the material tacky and temporarily stick the multiple plies together in those areas; and, thereafter, contacting those areas of the material with a heated cutting and sealing element in order to sever all of the multiple plies and seal the severed margins thereof. Further, after the application of heat and pressure, the zipper closure portions of the material in the areas thereof to be severed and sealed are preheated. Also, after the margins of the multiple plies of material are severed and sealed, pressure is applied to the zipper closure portions at the severed and sealed margins to ensuring sealing thereof.

REFERENCES:
patent: 3033257 (1962-05-01), Weber
patent: 3853671 (1974-12-01), Ausnit
patent: 3986914 (1976-10-01), Howard
patent: 4024010 (1977-05-01), Boccia
patent: 4304615 (1981-12-01), Seigel
patent: 4396449 (1983-08-01), Tumminia
patent: 4561109 (1985-12-01), Herrington
patent: 4658433 (1987-04-01), Savicki

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