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LAMINATING PROCEDURE:
Place the stack of laminations between the hot plates, close shield door or gates. Tighten release valve screw and pump
up the press quickly, using the short lever. As soon as the press openings are closed, place the long pump lever over the
short pump lever and continue pumping until the hand on the gauge indicates the desired load. The load should equal
about 350 pounds per square inch (24.1 bar) of plastic sheet (this figure may vary according to the nature of the
particular plastic sheet used).
The desired load as read on the press gauge can be figured like the following example:
Using 9" x 12" (22.8cm x 30.5cm) plastic sheet
9" x 12" (22.8cm x 30.5cm) = 108 sq. inch (695.4 sq. cm)
108 sq. inch x 350# psi (695.4 sq. cm x 24.1 bar) = 37,800# load (168Kn)
Initially it is always desirable to pump up a few hundred pounds over the computed load to compensate for immediate
compression of blotters and plastic. Additional pumping to maintain correct pressure may be done for the first two
minutes of heating time, but should not be done after that time. Allow the stack to remain under heat for a period of time
roughly determined by multiplying 3 minutes by the number of layers in the stack. Thus, a six-layer stack should take
about 18 minutes to heat.
For example:
6 layers x 3 minutes = 18 minutes heat
This time may vary according to the thickness and condition of the plastic sheet used. (See notes and suggestions).
Use the manual timer provided on the press for timing laminating cycles.
After the stack has heated sufficiently for lamination to take place, it is then transferred to the cold opening.
The two holding clamps are used to hold the stack of laminations firmly while it is being transferred from the hot to cold
opening. Aside from the fact that they make it more convenient to hold the hot stack, the proper use of the clamps is
essential because they permit the maintenance of proper pressure on the stack to prevent bubbles from forming during
transfer.
Open the guard door and attach the holding clamps to the holding plates, gripping the stack at the center of each
projecting side, near the columns. Only firm pressure on the holding clamps is needed, just enough to keep the stack
from expanding while the transfer is made.
After the holding clamps are in place on the heated stack, close the guard door and open the press by loosening the
release valve screw to relieve pressure. After the press is open, open the guard door and transfer the heated stack form
the hot to the cold chamber, using the holding clamps as handles. While the press is open, place a fresh stack of
laminations between the hot plates close shield doors or gates. Follow by bringing up pressure to the desired point and
allow the new stack to remain under heat and pressure for a sufficient time for lamination to take place, the same as
before.
While this second stack is heating, the first stack will be cooling. The holding clamps may now be removed from the
stack cooling and made ready to clamp the second stack in the heating chamber. This procedure is continued using the
thick stack for the next transfer, thereby producing a stack of laminations every six to eight minutes.
4-10
Carver Inc
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