Definition: a mainstream between spure and gate, it is melting plastic by the mainstream way flows into the cavity of transition section is also through the cross section area of change in the gating system and the transition section of plastic to, can make the plastic to get a smooth transformation.
1. Section design
A. The general design section is round.
B. From the convenience of processing, it is generally designed as u-shaped, v-shaped, trapezoidal, and hexagon.
C. sub- runner cross section shape and size, volume should be based on the shape of the plastic parts, plastic parts used in wall thickness, shape of plastic parts, plastic process characteristics, injection rate, factors such as distributary channel length to determine.
2. The layout of the sub-runner has two forms: balanced feeding and non-equilibrium feeding.The balanced feed is to ensure that the feed intake is evenly balanced and the non-equilibrium feeding is that the feed intake can not be balanced at the same time, and the flow analysis should be carried out for evaluation.