Types of Extrusion Systems in Blow Molding | Chen Way
Continuous extrusion vs accumulator die head extrusion in blow molding: how product size, weight and shot size, including flash, decide which system to use.
Types of Extrusion Systems in Blow Molding
Chen Way Machinery β Professional Blow Molding Machine Manufacturer in Taiwan
Blow molding extrusion systems are primarily divided into two categories: Continuous Extrusion and Accumulator Die Head Extrusion. The critical factors in choosing between them depend on the product's dimensions and weight, as well as the required shot size.
Continuous extrusion is ideal for smaller, lightweight products. In contrast, the accumulator die head system stores molten plastic in the head before extruding it at high speeds, making it well-suited for large-scale or elongated parts.
When calculating the actual shot size, it is essential to account for the product's net weight, dimensions, and flash/trim waste to guarantee molding stability and optimal production efficiency.
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Extrusion Systems: Calculating the Shot
Blow molding extrusion systems fall into two groups. Continuous extrusion keeps the parison moving and is ideal for smaller, lighter products, while an accumulator die head stores molten plastic in the head and pushes it out at high speed, which suits large or elongated parts.
The deciding number is the actual shot size: the product's net weight plus the flash and trim waste generated each cycle, considered together with the product dimensions. Getting this calculation right at the specification stage keeps molding stable and production efficient, and it is the first figure to include in a machine inquiry. A product near the boundary between the two systems is worth discussing with drawings, because length and geometry matter as well as weight. Send product weight and size for a shot-size check.