boiled yarn

Finally she took a kettle, set it on the fire, and boiled yarn in it.

终於，继母取出一只锅子，架在火堆上，在里面煮线团。

The PVA yam as the core and the cotton fiber as the sheath are interlaced, which is helpful to set the boiled hollow yarn.

芯纱使用PVA短纤细纱，皮层采用棉纤维，芯纱的毛羽和皮层的棉纤维形成一定程度的交错，对退维后空心纱中空部分的定形有一定的帮助。

The factors that affect the hollow result of boiled yarn are the twist multiplier of core yarn, the percentage of the core, the kind of PVA fiber and the core coverage of core-yarn.

影响空芯纱退维后中空效果的因素有：包芯纱的捻系数，芯纱的含量，选用PVA纤维的品种及包芯纱的包覆效果等。