Plastic Cookie Box Injection Mold

Requirements of thin-wall cookie box mold

H13 is the basic steel for thin wall molds, raw material usually should be clear transparent, it requires steel polishing property. To ensure the mold lifetime, thin-walled molds are thicker and stiffer than normal molds. With the high-speed high-pressure injection, to reduce the distortion during long-term high-speed production, there is a reinforcement rib design.

High-speed injection requires adequate venting and higher precision in tooling, steel hardness must be HRC42 above. NAK-80 or 718H only with HRC30 above, In order to achieve uniform wall thickness injection molding.

Multi-cavity molds are more demanding, with ejector and blower, quickly demolding the product for quick mold clamping, to increase productivity.

For thin wall injection mold S136 with HRC43-45 is our choice usually, H13 with HRC43-45 can be the second choice for economic investment.

Difficulties of thin-wall injection molding

Because the mold is cold when the thin wall injection molding material molten fills the cavity of the mold, the inner wall of the mold forms a solidified layer, injection molding wall thickness variation, thereby reducing the flowability of the plastic. The smaller the wall thickness of the plastic product, the more serious this situation. When the filling is not completed, the raw material circulation passage disappears due to the thickened solid layer, and the product will be scrapped. Therefore, thin-walled injection molds usually need to be matched with high-speed injection molding machines, and when the solidified layer is not too thick, the injection molding is completed. The increase in the injection speed requires an increase in the injection mold clamping force, and it is also necessary to prevent the high internal stress of the product from deforming the product after demolding.

In general, about injection molding machine design, standard injection molding machines need to meet the requirements for thin-wall injection molding.

Selection of raw material for plastic cookie box mold