The Runner Design of Plastic Injection Mold Plays great role in a successful project
As a professional Injection Mold Maker , Top Notch Mold Will offer a few Runner design suggestions According to our tooling manufacturing workshop experience
1. Use short runner as much short as possible to Reduce heat and pressure losses ,and add R on Angel Areas to make sure the resin material flow smoothly ,P 1-2 P1-3;
2.Runner Design for Multi-Cavity Mold
A geometric‑balanced layout shall be used for Multi Cavity Mold or one mold with Multi -Gate Points ,
and the Mold Flow is always very critical to decide the gate position and the runner size to make sure ,The resin could flow and fill into all cavities simultaneously
3. Transparent Parts with PC.PMMA material to avoid cold material direct to the parts to cause bad visible effects , advise to design “S”Runner P1-6
4 need to use 300- 600# sandpaper to smoothe the runner,especially mirror surface treatment needs to use more than 600# sandpaper to make sure better flowabilities
5. The end of the runner must be designed with cold slug well to avoid cld material flow into part to cause bad visiable parts,The end of the runner must be designed with cold slug well to avoid cld material flow into part to cause bad visiable parts, P1-7
6. the first option must use self-cutting runner design , and take out of the runner by robots easily ,and wont influence the plastic parts quality No Visible flaws
7. different parts on one mold
the runner gate to the parts should be diffferent based on the size of the parts .
8.Multi cavities ( a few different parts on one mold ) must design switching off runner inserts to make sure if customers only produce one parts at one time ,or the different color , and also can use this insert to adjust runner size to make sure fill in the part balancedly , and need to make switching off runner on easy to be filled part .P1-10b
9. To Save Injection Mold and production of plastic parts cost , Need to make the mold layout symmetric and more tight to reduce the mold size ,and runner weight,and use more small Tonnage IMM (injection molding machine ) P1-11
it’s easier to cause flashes and part dimension flaws with unreasonable mold layout ,
10. Need to make Tab-Runner for all branches runner to make sure filling balance,,all branch runners need to separate primary and secondary runners ,P1-16
