Process and machine for wrapping products with stretchable film,

Details Process and machine for wrapping products with stretchable film, Process and machine for wrapping products with stretchable film,

1994-03-22

1996-06-25

Johnson, Linda

Package making

Methods

Conforming by stretching or shrinking of cover over contents

53464, B65B 1100, B65B 5300

Patent

active

055288812

ABSTRACT:
A portion of film, with a length proportionate to the dimensions and to the characteristics of the product to be wrapped, is subjected to a transverse pre-stretching, the extent of which is also proportionate to the said parameters. The film is held at one end by a fixed dispenser (30) and at the other end by a movable rear clamp (61), which conveniently reduce the longitudinal tension of the film, both in pre-stretching and during the subsequent lifting of the product. In this phase, the side clamps (78-178) approach each other to reduce the pre-stretching, and are then inserted under the product and are opened, to extend the side flaps of the film under the product. This is followed by the operation, as a group, of the rear folder (52), which extends under the product a portion of the film held by the associated rear clamp (61), and the pusher (55) which pushes the product on to the front folder (37), while a final flap of film is drawn from the fixed dispenser (30), is extended over the whole length of the bottom of the product, is cut to size, and is disposed under the side flaps and the rear flap, which has been released at the correct time by the said rear clamp.

REFERENCES:
patent: 3662513 (1972-05-01), Fabbri
patent: 3967433 (1976-07-01), Bonfiglioli
patent: 4505092 (1985-03-01), Bowers et al.
patent: 4583348 (1986-04-01), Teiber et al.
patent: 4674269 (1987-06-01), Denda
patent: 4709531 (1987-12-01), Denda
patent: 4958479 (1990-09-01), Treiber

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