Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Including shaping means comprising fluid pressure contacting...
Patent
1985-07-15
1986-04-01
Dawson, Robert A.
Plastic article or earthenware shaping or treating: apparatus
Preform reshaping or resizing means: or vulcanizing means...
Including shaping means comprising fluid pressure contacting...
156498, 264101, 264571, 425DIG60, B29C 5110
Patent
active
045795169
ABSTRACT:
This invention discloses a forming roller used in the production of air packaging or dunnage. This forming roller receives heated thermoplastic film brought to the peripheral surface and with vacuum draws this softened film into formed cavities to provide bubbles or blisters in said film. The roller is made of a rapid heat-conducting metal such as aluminum. A shaft providing stiffness is inserted in the roller and fluid conduits in the shaft ends communicate with a counterbore formed in both ends of the roller. Fluid-conducting passageways are drilled in this roller and carry controlled-temperature fluid from one end of the roller to the other. In this same roller is formed vacuum-conducting drilled holes that communicate with the multiplicity of formed pockets in the peripheral surface of the roller. A collector shoe having an arc-shaped cavity is disposed to engage at one time about one-half of the vacuum conductors and is disposed to carry vacuum to these conductors as the roller is turned. The other ends of these conductors are closed and as the open ends of these conductors move from in way of the shoe, vacuum is removed and atmosphere allows the bubble or blister portions to be lifted from within the pockets.
REFERENCES:
patent: 3142599 (1964-07-01), Chavannes
patent: 3285793 (1966-11-01), Chavannes
patent: 3416984 (1968-12-01), Chavannes et al.
patent: 4412879 (1983-11-01), Ottaviano
patent: 4427474 (1984-01-01), Ottaviano
Dawson Robert A.
Roberts Ralph R.
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