Package making – Methods – Conforming by stretching or shrinking of cover over contents
Patent
1994-12-19
1996-12-10
Johnson, Linda
Package making
Methods
Conforming by stretching or shrinking of cover over contents
53556, 533894, B65B 1312
Patent
active
055819796
ABSTRACT:
A method and apparatus for applying a constant tension to a film in a wrapping machine having a film roller rotated at a variable rate by a film drawn over the film roller. The rotating film roller drives a hydraulic pump at a variable rate dependent on the rotation rate of the film roller. An oil reservoir is coupled to the hydraulic pump to form a hydraulic circuit, wherein the hydraulic pump pumps oil through the hydraulic circuit as the film roller drives the hydraulic pump. An adjustable constant pressure valve is coupled to the hydraulic circuit and maintains a constant oil pressure in the hydraulic circuit, wherein the hydraulic pump maintains a constant drag on the film roller independent of the rate at which the film roller drives the hydraulic pump, and wherein the constant drag on the film roller applies a constant tension to the film independent of the rate at which the film is drawn over the film roller.
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Highlight Industries, Inc., "Synergy 2 With Hydro-Stretch", 1991.
Johnson Linda
Mima Incorporated
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