Subsequently, molten (L1) is introduced to the inner circumferential wall side of the outer tubular body (14) while sustaining rotation of the tubular die (22) thus forming an inner tubular body (12).

随后，在筒状模具(22)持续旋转的同时，将熔体(L1)引到所述外筒状体(14)的内周壁侧，从而形成内筒状体(12)。

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Outer shell includes first and second shell side walls attached to a shell bottom wall and covering first and second open ends of inner sleeve.

外壳包括第一和第二壳壳底部连接到墙上，涵盖内套完第一和第二次公开墙。

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A box includes an outer shell surrounding an inner sleeve having spaced apart first and second sleeve side walls attached to a sleeve bottom wall.

一个盒子包括一个外壳内套筒周围有一间隔开第一和第二袖袖端连接到底壁墙。

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