Theatre Design & Technology - Oct 1969 - 21
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Fig 3: Vacuum forming machine, clamping
frame
24" x 24" and 40" and 72" sheets. The
best idea is to check with your supplier before designing a machine. The machine described here was designed to form Cinabex
(before CinaiJex became unavailable). as weii
as styrene. so it was designed to form an
area of 24" x 27". This results in some
waste when forming styrene. for the 24" x
27" sheets must be cut from larger stock.
The Clamping Frame: The clamping frame is
used to hold the plastic sheet in position
for heating and forming. It is most important that the frame clamp the plastic tightly
as the sheet material has a tendency to
shrink under heat. If the sheet pulls loose
from the trame It will not form a tight seal
with the platen and the vacuum chamber so
that the vacuum or air pressure wiii escape
and the sheet will not form well. If the
sheet is held tightly in the frame, and does
not form weii on contact with the mold,
then the sheet can be reheated and reformed. A frame variable in size would be
desirable but is more difficult to build than
a fixed platen. The frame depth must be
adjustable in order to clamp sheet stock of
different thicknesses up to Va". Lining the
surface of the clamping frame with asbestos will help to insulate the sheet from
the frame, help to eliminate heat loss, and
provide a better clamping surface.
~ THEATER DESIGN AND TECHNOLOGY
OCTOBER, 1969
The Platen: The platen is the surface upon
which the mold is placed and upon which
the plastic rests when the sheet is being
formed. Plywood, masonite, and hardboard
are often used. The platen should be thick
enough or reinforced so as to practically
eliminate deflection. All the joints should
be caulked before assembly. A ridge should
be built into the platen in order to provide a
more efficient seal between the sheet and
the platen. This ridge should be slightly
more than the thickness of the bottom half
of the clamping frame below the surface of
the platen.
21
Table of Contents for the Digital Edition of Theatre Design & Technology - Oct 1969
Contents
Theatre Design & Technology - Oct 1969 - 1
Theatre Design & Technology - Oct 1969 - 2
Theatre Design & Technology - Oct 1969 - 3
Theatre Design & Technology - Oct 1969 - Contents
Theatre Design & Technology - Oct 1969 - 5
Theatre Design & Technology - Oct 1969 - 6
Theatre Design & Technology - Oct 1969 - 7
Theatre Design & Technology - Oct 1969 - 8
Theatre Design & Technology - Oct 1969 - 9
Theatre Design & Technology - Oct 1969 - 10
Theatre Design & Technology - Oct 1969 - 11
Theatre Design & Technology - Oct 1969 - 12
Theatre Design & Technology - Oct 1969 - 13
Theatre Design & Technology - Oct 1969 - 14
Theatre Design & Technology - Oct 1969 - 15
Theatre Design & Technology - Oct 1969 - 16
Theatre Design & Technology - Oct 1969 - 17
Theatre Design & Technology - Oct 1969 - 18
Theatre Design & Technology - Oct 1969 - 19
Theatre Design & Technology - Oct 1969 - 20
Theatre Design & Technology - Oct 1969 - 21
Theatre Design & Technology - Oct 1969 - 22
Theatre Design & Technology - Oct 1969 - 23
Theatre Design & Technology - Oct 1969 - 24
Theatre Design & Technology - Oct 1969 - 25
Theatre Design & Technology - Oct 1969 - 26
Theatre Design & Technology - Oct 1969 - 27
Theatre Design & Technology - Oct 1969 - 28
Theatre Design & Technology - Oct 1969 - 29
Theatre Design & Technology - Oct 1969 - 30
Theatre Design & Technology - Oct 1969 - 31
Theatre Design & Technology - Oct 1969 - 32
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