Plastic Cutlery Injection Mold

The steel of plastic cutlery injection mold

Consumption of plastic cutlery is very huge, especially disposable plastic cutlery. So plastic cutlery mold needs with long life to meet the production quantity request. SWY Mould uses H13 to produce plastic cutlery molds. H13 steel after vacuum quenching hardening treatment, its hardness can reach 48HRC to 52HRC. The mold life can exceed 3 million shots.

The runner system of plastic cutlery injection mold

plastic cutlery mold can be made with a cold runner or hot runner system. But most is cold runner system. For some large quantity cavity numbers, SWY MOULD suggests making the cutlery mold with one point big gate hot runner system to easily make the injection molding. Plastic cutlery molds often use round shape and sector shape runner to ensure each cavity can get the same injection pressure during injection molding. This kind of runner design can offer excellent runner balance.

The plastic raw material of plastic cutlery injection mold

Most of the plastic cutlery is made by food safe grade PP material and food-safe-grade PS material. Plastic cutlery made by PP is softer than PS material.

Tooling process required for plastic cutlery injection mold

After mold steel purchased, we will do the CNC milling tooling and drilling holes for the mold. CNC milling tooling is a process of rough tooling. 

After the rough tooling, the mold cavity plate and core plate will be done the vacuum quenching hardening treatment to make the steel hardness to 48HRC to 52HRC. With this hardness, mold life will be more than 1,000,000 shots. As the steel with high hardness, the following precise tooling will take a long time.  So cutlery mold production can not be quick. CNC engraving tooling is the cutlery mold's main precise tooling.

After CNC engraving tooling, cutlery mold will be assembled and make for the first time mold test. At first, the mold won't be polished, after there is no problem, the mold will go on the polish job. At last, when the customer confirms to ship the molds, we will do the last test to ensure all process is ok and then packed for shipment.