| 摘要 |
A method of making a solid core locatable between a wheel rim and a tire fitted to the rim, includes introducing a foamable composition into a mould cavity having a substantially inflexible mould surface. The cavity is suitably shaped so that a core locatable between a wheel rim and a tire fitted to the rim can be moulded therein. The composition is allowed to foam, thereby to fill the mould cavity. Air and excess composition is allowed to vent from the cavity via an elongate vent slit extending along a major portion of the cavity. The foamed core thus moulded in the cavity is removed from the cavity on the composition having set at least partially. |
