Injection moulding

Hollow and flat porcelain parts are manufactured in modern production facilities using a high-pressure mechanical moulding process. In technical jargon, this automated type of moulding is known as injection moulding or injection compression moulding. The production mass differs from the classic slip and is far more plastic. It has a moisture content of only around 20%.

Our video presents various techniques, press systems and processes from different countries. All of these presses work in the so-called wet process and process either liquid slip or semi-dry hubel-mass. The porcelain mass is pressed into negative working moulds by the hydraulic press under high pressure and thereby compacted. Depending on the type of machine and the moisture content of the body, it takes a short time until enough moisture has escaped from the body and the porcelain body is hard enough to be removed from the mould.

In contrast to the typical plaster moulds used in the porcelain industry, most of these presses do not work with plaster moulds, but with special plastic moulds. The task of the hygroscopic property of plaster, namely to remove the water from the mass, is performed in the high-pressure moulds by the pressure of the press plunger. Such plastic moulds are many times more durable than plaster moulds and therefore have a much longer half-life.