How do you select a blow molding machine for 20L–30L HDPE jerry cans?

For manufacturers planning to produce 20L–30L HDPE jerry cans, selecting the right extrusion blow molding machine is an important production decision. The machine should match the container size, product design, material, target output and future product plans. It should also provide stable extrusion, consistent wall thickness, reliable mold clamping and practical operation for daily production.

The lowest initial price is not always the lowest total cost. An unsuitable machine may lead to unstable processing, excessive flash, difficult mold changes, inconsistent product weight or longer commissioning time. A better approach is to evaluate the complete application before choosing the equipment.

1. Start with the product, not only the machine model

Before requesting a quotation, prepare the basic information about the jerry can that you plan to produce:

• Nominal product volume and external dimensions
• Product drawing or physical sample
• Neck size, handle design and closure requirements
• Single-layer or multi-layer structure
• Target product weight and wall thickness
• Number of cavities
• Required production output
• HDPE grade and any recycled-material requirements
• Destination-market power and utility conditions

A 20L jerry can and a 30L jerry can may require different mold dimensions, extrusion capacity, clamping force and process settings. If the same machine will be used for several container sizes, the complete range should be reviewed before the equipment is finalized.

2. Match the extrusion unit with HDPE production requirements

HDPE is widely used for jerry cans because it combines good impact resistance, chemical resistance and processability. However, the material grade, product weight and container structure still influence the required machine configuration.

The extrusion unit, screw design, heating zones and die head should work together to provide stable melt flow. Stable melt flow helps the machine form a consistent parison before the mold closes. If the parison is unstable, the finished container may show uneven wall thickness, inconsistent weight or weak areas around the corners and handle.

For lubricant, detergent, agrochemical or other industrial containers, the buyer should also review the required chemical resistance and finished-container performance. Material selection and machine selection should be evaluated together rather than treated as separate decisions.

3. Review wall thickness control carefully

The wall thickness of a 20L–30L jerry can is not necessarily uniform across every area. The handle, shoulder, corners and base may require different material distribution to achieve the required strength and shape.

When comparing machines, ask the supplier how the equipment manages:

• Parison stability during extrusion
• Wall thickness distribution
• Product weight repeatability
• Corner and handle formation
• Flash generation and trimming
• Cooling consistency
• Adjustment of process parameters for different products