Method and apparatus for making profile sheets

Details Method and apparatus for making profile sheets Method and apparatus for making profile sheets

1976-08-16

1981-03-31

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156 91, 156498, 156500, 425114, 425381, 425382R, 425462, 425463, 425464, B29D 702

Patent

active

042591333

ABSTRACT:
A method and mechanism for continuously making film with one or more fastener profiles thereon to be used for making reclosable plastic bags. The film is extruded through a T-shaped head having a thin slot die opening, and at least one fastener profile is extruded through a preform die block positioned so that the film and profile will engage and fuse to each other while the plastic is still in the state of fusion. The die block is mounted adjustably to be moved into different positions along the film head with the positions varying across the film width to control the location of the profile relative to the edges of the film or relative to other profiles on the film, with the width of the film also being controllable.

REFERENCES:
patent: 3111715 (1963-11-01), Hofer
patent: 3198228 (1965-08-01), Naito
patent: 3462332 (1969-08-01), Goto
patent: 3474495 (1969-10-01), Deutsch et al.
patent: 3543379 (1970-12-01), Naito

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