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

在点浇口形式模具道模具中也用到另一种形式主道。

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

固化后胎花纹清晰,气泡和缺料现象。

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

主道拉料杆凹槽形成了一个有效底切，可以用来拉出主道者是下进料设计中二级主道。