What Are The Requirements Of Thin-wall Injection Molding on Mold?

April 26, 2022

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

Speed is one of the key factors for the success of thin-wall injection molding. Rapid mold filling and high pressure inject molten thermoplastic material into the mold cavity at high speed, preventing gate getting cold. For example, if a standard part is filled in two seconds, a 25% reduction in mold thickness could potentially reduce fill time by 50% to reduce it to 1 second.

One of the advantages of thin-wall injection molding is that less material needs to be cooled when the thickness is reduced. As the thickness is reduced, the molding cycle can be cut in half. The reasonable setting of the melt conveying device makes the hot runner and gate runner not effect the shortening of the molding cycle. The use of hot runners and sprue liners helps minimize cycle times. In addition, the mold material should also be considered.

P20 steel is widely used in the molding of traditional products, but due to the higher pressure of thin-wall injection molding, the mold must be made very strong. H-13 and other hard steels add an extra factor of safety to thin wall dies. However, the cost of a solid mold can be 30% to 40% higher than that of a standard mold. But the increased cost is often offset by improved production performance.

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