| ONE
PART SKIN MOULDING |
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Producing the Backing Case
The backing case (blue colored in figure) can be made from plaster
or epoxy resin or polyurethane, by casting or by polyester lamination.
It is often advisable to strengthen the backing case using struts
made from cardboard or plywood coated in glass fibre + polyester. |
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The model must be surface treated. Cover the model in
a very fine layer of vaseline spread it under stream of hot
air.
Position
the model on the base, attach by screwing, seal the joint
between the model and the base with plastiline avoiding any
air inclusions. The model is then covered in aluminium foil,
with a layer of plastiline of constant thickness.
A
mould release agent is applied to all surfaces of the dismantable
frame, then the backing case can made from the materials listed
above.
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Producing
the Membrane
The frame is dismantled, the mould is opened. The plastiline
is removed together wiht the protective film, the plastiline
is weighed to know how much RTV is to be used.
The
pouring and venting holes are made. To pour the RTV drill
a hole vertically from the lowest part of the model.
Cover
the whole internal surface of the backing case with vaseline
to avoid any suction, spread the vaseline by a hair dryer.
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Position
the backing case on the model again, fix them together and
set up a funnel on the pouring tube. Mix the RTV components
and degas then pour throught the funnel and wait to cure.
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TWO
PART SKIN MOULDING |
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| Parts
of The Mould
1- Positioning lines
2- Marker keys
This procedure is the same as the one part skin moulding but
is done twice, whilst observing several precautions; choosing
a parting line to be as invisible as possible and positioning
markers must be set up for both membranes and both backing
cases. |
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Position
the model up to the chosen
parting line in a plastiline base. Apply a calibrated plastiline
sheet to the exposed part of the model. Make the first half
of the backing case.
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Once the fist half of the backing case has hardened, remove
the plastiline making up the base and turn the first half
over. Make the second part exactly as the first one but apply
a mould release agent on the exposed surface of the backing
case.
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Making
the Membrane
Once the second half of the backing case is hardened, one
of the two sheets of plastiline covering the model is removed
(preferably the one with the largest surface area). Drill
through pouring holes and vents. Apply release treatment of
to the internal side of the half casing. RTV of the first
side is poured.
Exact
same procedure is followed for the second half. |
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Demoulding
is carried out once curing is complete. Cut of the flash from
the pouring an venting holes. Equipment is cleaned using a
solvents such as alcohol or acetone.
Reproduction
is made using the material of choice.
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