Injection Molding is the most dominant method for producing rigid, high-detail plastic components in high volumes.

• Function: Molten polymer is rapidly injected under extremely high pressure (thousands of PSI) into the cavity of a closed, precision steel mold. After the cavity is filled, pressure is maintained (packing phase), and the part is quickly cooled and ejected.

• Key Control: High precision in temperature, pressure, and cycle times is essential to prevent common defects like weld lines, sink marks, and warping.

• Products: Bottle caps and closures, intricate electronic components, automotive interiors, and toys (e.g., LEGO bricks).