Extrusion Blow Molding for Packaging Containers

How the hollow shape is formed

Extrusion blow molding starts with a molten plastic tube called a parison. The mold closes around it, compressed air expands it against the cavity, and cooling stabilizes the shape before removal and finishing. Bottles, jerry cans and drums are among the packaging applications.

Match the material and structure

Resin selection depends on the container’s contents, dimensions and required performance. HDPE is a common container material. Single-layer and multilayer arrangements require different equipment and tooling; define the intended structure before selecting the line.

Balance forming and cooling

Parison dimensions, wall distribution, inflation and mold cooling interact. The cycle includes extrusion, clamping, blowing, cooling, venting and removal. Establish product-specific settings through commissioning, then check weight, dimensions, appearance and the required container performance against an agreed specification.

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Adapted from Tongda’s original article, published 21 September 2026.