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Introduction to Injection Mold​

How It Works

Basic Principle:

  1. Plastic pellets (e.g., ABS, PP, PE) are heated and melted in a hopper.
  2. The molten plastic is injected under high pressure into a mold cavity (a precision-made metal mold with the shape of the desired part).
  3. The plastic cools and solidifies inside the mold, then the mold opens, and the finished part is ejected.

Key Components:

  1. Injection Unit: Melts the plastic and injects it into the mold.
  2. Mold: Consists of two halves (core and cavity) that form the part’s shape.
  3. Clamping Unit: Holds the mold closed during injection and opens it for part ejection.

advantages

  1. High production speed and efficiency for mass production.
  2. Consistent part quality and tight dimensional accuracy.
  3. Capable of creating intricate designs and thin-walled structures.

Types of Injection Mold

  1. Thermoplastic Injection Molding: Uses plastics that can be melted and re-melted (e.g., PVC, nylon).
  2. Thermoset Injection Molding: Uses plastics that harden permanently after heating (e.g., epoxy, polyurethane).

Applications

  1. Producing everyday items: Bottles, toys, automotive parts, electronics casings.
  2. Manufacturing complex shapes with high precision, such as gears and medical devices.