| 摘要 |
An extrusion head (1) has a case (3) with a spherical cavity (9) and a manifold (5) with a spherical surface (13) inside the spherical cavity (9), the case (3) and the manifold (5) defining a spherical annular flow path (15) between them for molten plastic. The manifold (5) is supported in the cavity (9) by supports (7) which displace flow of the molten plastic. To compensate for such displacement, air, a second molten plastic, or both are injected inside the molten plastic.
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