Method and apparatus for forming a pair of hems in superposed la

Details Method and apparatus for forming a pair of hems in superposed la Method and apparatus for forming a pair of hems in superposed la

1988-05-19

1989-04-11

Schmidt, Frederick R.

Manufacturing container or tube from paper; or other manufacturi

Bending

Folding

493248, B65H 4522

Patent

active

048202525

ABSTRACT:
An improved method and apparatus for forming a pair of inwardly turned hems in the adjoining free edges of superposed layers of a longitudinally folded moving pliable material web, particularly superposed thermoplastic film panels for forming plastic bags having draw tapes in the hems. The moving web is passed over the cylindrical surface of a roller with the free edge of the inner layer of the web passing over a plurality of rollers disposed at one end of the first-named roller. The surfaces of the plurality of rollers extend substantially to the periphery of the roller. The free edge of the outer layer of the web is passed over a semicylindrical surface adjacent the plurality of rollers. The free edges of the layers of the web are guided to a hem folder at the downstream side of a hem forming block where they are folded inwardly adjacent the respective layers of the web to provide a pair of inwardly turned hems in the adjoining free edges of the opposing layers of the web.

REFERENCES:
patent: 4617008 (1986-10-01), Boyd et al.

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