| 摘要 |
The mould has a filling aperture on its lower sections, the aperture having a return valve on its inside. The valve consists of a rubber-elastic material, and is reinforced by a leaf spring, the material being rubber. polyurethane etc. The valve is also under pretension when closed, and at least its surface is covered with an anti-adhesive layer. - The valve automatically locks the mould, is not susceptible to contaminations by the mixtures used, and is easy to clean. - The mixtures resin in the mould may be polyurethane unsaturated polyester resin, epoxy resin, phenol form-aldehyde or polyamides.
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