| 摘要 |
The moulding cone is in the shape of a cylinder (1) with a base (10) and an upper end recess (11) with a central cone (2) which has an inner cavity (20). The outside of the recess (11) is formed by an inner conical surface (12). The cylinder can be replaced by an oval-section part with flat sides and curved ends, with the thickness of its side walls smaller than that of its end walls. The mould is made from a supple plastic material such as rubber. |
