What Should Be Noticed When Using a Plastic Crusher for Mold Trial Parts?

Today, our department mainly focused on crushing and recycling excess mold trial parts. We kept only five samples, while the crushed material will later be used for injection molding machine purging during future mold trials with the same material.

Although operating a plastic crusher / plastic granulator is very simple—usually with only a start button and a stop button—many people overlook one important detail: before shutting down the crusher, the machine should always be allowed to run idle for a few minutes. This serves three main purposes:

  1. To clear out residual plastic material inside the machine and prevent material buildup.
  2. To prevent motor overload or blockage. If too much material remains inside the crusher, the motor load during the next startup will become extremely high. This can easily cause a machine jam and, in severe cases, may burn out the motor or damage transmission components.
  3. To avoid difficult cleanup work. If the machine stops while still full of material and becomes jammed, workers may need to spend several hours manually disassembling and cleaning the accumulated plastic, which is both time-consuming and potentially unsafe.

In addition, we also had another mold project today where the mold technician kept questioning the mold

designer, asking why all the issues were not identified during the previous modification stage, resulting in another round of corrections that wasted both time and effort.

In the mold industry, most “arguments” usually happen between mold technicians and mold designers 😂 Sometimes it is actually quite entertaining to watch, but these discussions also reflect how seriously we take responsibility for our customers’ projects.

At NAVIMOLD, we specialize in plastic injection molds, mold trials, mold modification, and injection molding solutions for global customers. From mold design to mass production, we focus on solving problems during the process to ensure stable quality and reliable final results.

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