Method of wrapping a load with stretchable plastic material

Details Method of wrapping a load with stretchable plastic material Method of wrapping a load with stretchable plastic material

1987-10-06

1991-08-20

Lowe, James

Package making

Methods

Conforming by stretching or shrinking of cover over contents

2642888, 2642902, B65B 5300, B29C 5510

Patent

active

050403567

ABSTRACT:
In a method for stretching plastic involving a stretching device incorporated into a stretch wrap machine for producing stretched plastic for wrapping a load, means are provided for stretching a sheet of stretchable plastic material at an angle across one or more stretching devices. The method comprises stretching the plastic over a plurality of generatrices in substantially parallel arrangement, moving the generatrices in an eccentric path about a central axis, and moving the generatrices in the axial directions, in staggered coordination. The movement of the generatrices imparts a biaxial stretch pattern upon the plastic and produces a neck down pattern.

REFERENCES:
patent: 2505146 (1950-04-01), Ryan
patent: 2571355 (1951-10-01), Gardner
patent: 3350491 (1967-10-01), Rasmussen
patent: 3441638 (1969-04-01), Patchell et al.
patent: 3632716 (1972-01-01), Fairbanks
patent: 3833973 (1974-09-01), Schwarz
patent: 4140827 (1979-02-01), Willwerth
patent: 4302920 (1981-12-01), Lancaster et al.
patent: 4458467 (1984-07-01), Shulman et al.

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