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)。
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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