| 摘要 |
<p>A method is provided of decorating an intended unrevealed face of a plastics sheet before moulding thereof, which comprises applying to the sheet a coloured or pigmented layer that is highly stretchable under moulding conditions for the sheet, the layer being applied to the sheet as a liquid film or curtain of a high molecular weight resin in a volatile solvent mixture and optionally is pigmented with TiO2 or a mixture of TiO2 and china clay of average particle size of the piment about 2 microns. The coating material may be pressure or gravity fed from the coating head onto the sheet through a chamber that surrounds the liquid film, the interior of the chamber becoming saturated or nearly saturated with solvent mixture. The invention also provides apparatus for the curtain coating of articles comprising a coating head having chamber and a slit leading from the chamber for discharge of a curtain of liquid coating material, wherein at least the inner surface of the chamber is of a plastics material that readily releases the coating liquid.</p> |
