| 摘要 |
<p>A method of making multiply-perforated ceramic plaques (1) by pressing a plastic ceramics mix between upper (A, B) and lower (C) mould members, wherein the upper mould member has a corresponding multiplicity of retractable pins (4) to form the perforations in the plaque (1), and the plaque (1) is made by steps of moulding the ceramics mix to form a green plaque, withdrawing the lower mould (C) member leaving the plaque (1) adhering to the upper mould member (B) and its pins (4), retracting the pins (4) from the plaque (1), and releasing the plaque (1) onto a support for drying and firing.</p> |
