Package making – Methods – Conforming by stretching or shrinking of cover over contents
Patent
1980-11-14
1982-12-07
Sipos, John
Package making
Methods
Conforming by stretching or shrinking of cover over contents
53465, 53556, 53587, 53211, 53380, B65B 1104
Patent
active
043620019
ABSTRACT:
A cylindrical package to be wrapped with stretch film sheet material is supported on a pair of parallel, horizontally spaced, horizontally extending support rollers, one of which is rotatably driven and the other of which is a slave roll which rotates idly. A stretch film supply means is mounted on a movable carriage with the axis of the film supply means parallel to the axis of rotation of the package. The carriage is caused to reciprocate along a path parallel to the axis of rotation of the package and the support rollers. The reciprocation occurs between a first position where the film material extends beyond one end of the package a distance at least as great as the radius of the package and a second position where the film extends beyond the other end of the package a similar distance. The film material is wrapped while tension is applied thereto. The tensioning device is designed to vary pressure at the end portions of the carriage path in relationship to the intermediate portions, so that the overlapped portion of the stretch film material tends to fold in and seal the ends of the package. A post member extends across and adjacent to each end of the package to ensure folding in and sealing of the film material.
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Cockerham, Jr. C. C.
Nelson John P.
Rhodes Charles R.
Sipos John
Smith Judith G.
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