- This ensures there is no gap between the stem and the spray nozzle when touching. Such gaps can be worn by the growing problems caused some material leaks.
- The angle of the stem taper should be large enough spray to break the mold, but if too large will increase the cooling time, material costs , cut time consuming ejected from the product. If the taper angle is too small can cause difficulties when removing stalks when open mold spray. Therefore, the minimum taper angle should be 1 °.
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