| 摘要 |
<p>Method for obtaining a water-heater body of plastic material wherein (1) a shell of plastic material is used which is intended to form the inside of the water-heater and is also used as inner moulding wall, said shell comprising at least one orifice, (2) said shell is placed inside a mould consisting of two parts, and providing a space between the outer side of the shell and the inside of the mould, the mould presenting an opening, (3) water is supplied into the inner shell through said outside, (4) a liquid mixture is cast through said opening of the mould, said liquid mixture comprising substantially a polyester resin composition capable of foaming and curing, by cooling the outside of the mould to a temperature of about 10-15oC when pouring the resin in order to provide a skin effect at the contact surface of the foam with the mould upon curing thereof, by controlling the resin temperature in the course of expansion and curing so that it does not exceed 40oC approximately.</p> |
