After curing, the tire is without bubble and underfeeding and the tread pattern is clear.

固化后轮胎花纹清晰,无气泡和缺料现象。

A modified form of sprue gate is also used on underfeed moulds and runnerless moulds.

在点浇口形式或无流道中也用种形式主流道。

The grooved head of the sprue puller creates an effective undercut which is used to pull the sprue, or secondary sprues in underfeed designs.

主流道拉料杆头部凹槽形成了个有效底切，可以用来拉出主流道或者是下进料设计中二级主流道。