What are the requirements of thin-wall injection molding on the injection machine?

April 20, 2022

What are the requirements of thin-wall injection molding on the injection machine?

The need to produce small and lightweight parts has made thin-wall injection molding the most in-demand performance increase for injection molding machines.

"Thin wall" is generally defined by a lightweight electronic part with a wall thickness of less than 1mm. For large automotive parts, the "thin wall" can be 2mm.

Thin-walled products require changes in processing: higher pressures and speeds, shorter cooling times, changes in part ejection and gate arrangement. The following are the requirements of thin-wall injection molding for the injection machine.

It shall be all-electric and electric/hydraulic injection machines with high-speed and high-pressure performance.

In order to withstand the high pressures of new injection machines, the minimum clamping force must be 5 to 7 tons per inch.

In addition, the large template helps reduce bending as the wall thickness decreases and injection pressure increases. Injection molding machines for thin-walled products have a tie-rod-to-stencil thickness ratio of 2:1 or less.

When producing thin-walled parts, dead-loop control of injection speed and pressure and other processing parameters helps control mold filling and holding pressure at high pressure and high speed.

As for the injection volume, large diameter barrels are often too large, and the recommended injection volume is 40% to 70% of the barrel capacity. The overall molding cycle of thin-walled products is greatly shortened, and it is possible to reduce the minimum injection volume to 20% to 30% of the barrel capacity.

Users must be very careful when injection molding, because for the material, a small injection volume means that the material stays in the barrel for a longer time, which will lead to a decrease in the performance of the product.

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