Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With gas – vapor – or flame contact means for work
Patent
1975-02-14
1977-04-26
Weston, Caleb
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With gas, vapor, or flame contact means for work
53373, 156498, 156499, 156555, B29D 2300
Patent
active
040199460
ABSTRACT:
A hot air heat sealing apparatus for sealing together two layers of heat softenable plastics material comprising a fan, ducting arranged to divide the air stream from the fan into at least two flows, a heater disposed in the path of one of said flows, means by which air heated by the heater is directed in use onto the layers of plastics material thereby to soften said layers at a region thereof where they are to be sealed together, a pair of rollers arranged to nip the softened layers together to produce a seal, one of said pairs of rollers being mounted for pivotal movement radially relative to the other roller of said pair, means for pivotally moving said one roller whereby the nipping pressure exerted by the rollers can be varied and plastics material layers of different thickness can be accommodated and means for varying the inclination of the axes of the rollers relative to one another, whereby said axes can be brought into parallelism, and guide means disposed in the path of the other of said flows for guiding said other flow into contact with said layers above said region, to cool the area above said region whereby said layers are not softened above said region.
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patent: 3855037 (1974-12-01), Imhagen et al.
patent: 3901758 (1975-08-01), Humphries
The Thames Sack and Bag Company Limited
Weston Caleb
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