Package making – Methods – Conforming by stretching or shrinking of cover over contents
Patent
1988-11-09
1989-10-03
Spruill, Robert L.
Package making
Methods
Conforming by stretching or shrinking of cover over contents
53 76, 53373, 53450, 53550, 53557, B65B 5302, B65B 906, B65B 5710
Patent
active
048708020
ABSTRACT:
A shrink wrap packaging machine that shrink wraps twice as many packages per unit of time as conventional machines. The machine includes a pair of longitudinally spaced sealing and cutting elements. Both elements are preceded by a sensor. The first sealing and cutting element is activated when the trailing edge of even numbered packages are detected whereas the second sealing and cutting element is activated when the second sensor detects the trailing edge of odd numbered packages. Packages are therefore wrapped in groups of two after leaving the first sealing and cutting station and are individually wrapped after leaving the second sealing and cutting station. The conveyor belt that carries packages through the machine operates at nearly twice the speed of prior art machines but the sealing and cutting elements of the present machines operate at the same rate as prior art machines.
REFERENCES:
patent: 2764862 (1956-10-01), Rado
patent: 3999357 (1976-12-01), Marantz
patent: 4219988 (1980-09-01), Shanklin et al.
patent: 4546595 (1985-10-01), Yasumune et al.
patent: 4658569 (1987-04-01), Hanagata
Johnson Linda B.
Mason, Jr. Joseph C.
Polycerf Inc.
Smith Ronald E.
Spruill Robert L.
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