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Thermoplastics Crystallinity

  • Apr 11, 2025

During the molding process, the aggregate structure of the polymer is very obvious due to the difference in process conditions, which in turn affects the performance of the product. The so-called aggregation phenomenon is that when the plastic changes from a molten state to a condensed state, the molecules stop moving freely and are arranged in a slightly fixed position with a tendency to be arranged in an ordered state.

Basic Introduction

In most cases: crystalline plastics are opaque or translucent, and amorphous plastics are transparent (such as plexiglass, etc.). ABS is an amorphous plastic but it is not an exception. Poly (4) methylpentene is a crystalline plastic with high transparency. If you want crystalline plastics to be crystalline after molding, pay attention to the heat required to raise the material temperature to the molding temperature when designing the mold and selecting the injection molding machine. The heat required is large, and equipment with large plasticizing capacity should be used; the heat released during condensation is large, and it must be fully cooled.

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