Radiation pattern (Jetting):the apparent ejected from the gate, the melt has a grey colour of a melt flow was immediately after injection in contact the die wall after the wrap. This defect may be partially or completely hidden in the interior.
Physical reasons: the radiation veins often occurs when the melt into the mold cavity, the fluid end stop development direction. It often happens in the mold die cavity, melt flow without direct contact to the mold wall or there are no obstacles. Through the gate, the melt contact some heat to the surface of the mold cavity is relatively cold after cooling, not during the process of mold filling with molten material then close together.
Remove the obvious surface defects, radiation pattern with inhomogeneity, melt frozen stretch, residual stress and cold strain produced, these factors all affect the quality of the products.

In most cases not likely to only by improving the adjusting process parameters, only the improved gate location and geometry can be avoided.

Causes and improvement measures associated with processing parameters see table:
1.the injection speed too fast to reduce the injection speed
2.the injection speed single stage using multi-stage injection speed: slow fast
3.the melt temperature is too low to improve the barrel temperature (the heat sensitive material only in the metering zone). To increase the low screw back pressure

And due to the design and improvement measures of the table below:
1.the gate and die wall transition is not good with arc transition
2.the gate is too small increase gate
3.the center gate, gate 3 is located in the relocation section thickness, using barrier injection, technology overflow refers to a deep vent in the mould by hand, in the production of the slot (batch produced peak), also called the process of peak, is primarily used for the improvement of burning rubber or weld line the burning, glue or weld line adjustment to this batch of peak, production after the resection.
1.burn four position refers to the burning rubber or weld process to not easy to see the location, in order to avoid the appearance of the product should be sound.
2.increase the low screw back pressure refers to the adjustment of back pressure.
3.barrier injection refers to the water front plus a block. Changing the injection gate to the position. In order to change the flowing direction shot rubber compound. The method for solving the spray pattern help.