From David Brown, Ex-Press Plastics
Norwich, Norfolk
We were delighted to see your article on our new plastic process Smoothtex,
but sadly it oversimplified a couple of points
(This Week, 24 January, p 15).
Initially, a coloured powder coating is electrostatically applied to a nickel
electroformed mould, which is then heated to a high temperature (about 150
°C). Immediately, a mix of the original powder coating and polypropylene
powder is applied as a second layer to provide an excellent bonding capability.
It is this layer which allows the coloured polymer coating to adhere to the
layers of Twintex that are subsequently applied to the mould.
