Cold spot mainly refers to the foggy or brightly colored markings at the near gate of the workpiece or the curved scars that appear from the gate as if they were attached to the cavity. They are caused by the plastic front entering the cavity or by excessive pressure. The cold material that is then squeezed into the cavity causes the forward material to transfer heat due to the cooling action of the nozzle or the flow passage, and is cooled and solidified before entering the cavity, and when the injection cavity is expanded through the narrow gate, The melt fracture was formed, and then it was pushed by the later hot melt, so it became a cold spot.
Solution:
(1) The cold well should be opened. Also consider the form, size and location of the gate to prevent the material from cooling at a significant rate.
(2) The centering degree of the nozzle should be adjusted, and the matching size between the nozzle and the mold feeding should be designed to prevent leakage or cause cold material to be brought into the cavity.
(3) The mold discharge degree is good. Gas interference can cause turbid markings in the gate.
(4) Increase the mold temperature. Slow down the injection speed, increase the injection pressure, reduce the pressure holding and injection time, and reduce the holding pressure.
(5) Dry the plastic. Use less lubricant to prevent contamination of the powder.
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