The
process is identical to the flat sheet process with an addition of forming
shoes in the oven stage to impart the desired corrugated configuration.
Reinforcing
media like fiberglass mats, fabrics and papers can be used.
The
resin impregnated system consists of an impregnating tank, doctor blade, roll
coater or other type of resin metering device.
Process:
a.
The
piles of reinforcement are drawn through a resin impregnating system.
b.
After
impregnation a carrier sheet of cellophane or PE film is applied to each face
of the web.
c.
The
sandwich then passes through a set of squeeze rolls to remove excess resin and
air. Here the final thickness is determined.
d.
The
web is then passed through a long, tunnel oven with precisely controlled
temperature zones. Here curing takes place. After curing the web emerges from
the oven as a rigid sheet.
e.
The
sheet is passed through the puller rolls and then it is trimmed by abrasive or
diamond saws. The cellophane is stripped and the sheet is cut to length by a
flying cut off saw.
f.
Sometimes
the laminated decorative flat sheet is produced by a continuous method and
sometimes by a translucent glazing panel and structural sheet for military and
electronic application. However most of the product is used in corrugated sheet
for the building industry.
Corrugated sheets are produced
by hand laminating and press moulding techniques but most of the production is
via continuous laminators.
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