Plastic Injection Stack Molds Factory

Stack molds are very common in custom plastic injection molding. It’s always refers to a mold that is stacked with a series of mold parting faces or mold split lines. Without increasing the machine platen size or tonnage, you can double the amount of cavities to enlarge the output, which increases molding efficiency and reduces the overall cost. Stack molds with same cavities in each mold parting surface can produce double of same standard plastic parts, while stack molds with different cavities in each mold parting surface can also produce multi-component or family parts in one shot on one plastic injection molding machine.

Precision plastic products

Plastic Industrial Part

Plastic Injection Molded-in Color

Gate-to-Gate Melt Transfer

Increasingly more popular is the melt transfer through the first mold parting surface without a sprue bar because it eliminates the sprue bar as an obstacle. The basic principle of a “sprue-bar-less” melt transfer is a nozzle-to-nozzle melt transfer.

As the mold parting surfaces close, two nozzle front ends establish a melt passage. These nozzles separate when the mold opens. A leak free connection or seal at 2000 bar or 30,000 psi is accomplished with the specially designed manifold system for stack molds from Mold Hotrunner Solutions®. During mold opening, the transfer nozzles provide a dry surface with absolutely no stringing or drooling of the melt.

A fully automated 24/7 molding operation with stack molds requires a functional melt transfer which operates over millions of cycles.

Advantages:

1)Doubled output: instead of increasing the mold size by adding more cavities, stack molds maintain mold size and machine size by adding a second layer of cavities parallel to the first layer. All the fill, pack and cooling time remain the same and only the mold open and mold close time add slightly to the cycle time. 

2)Reduced part and production cost: The part price is determined by the machines hour rate, which is directly related to the machine clamp tonnage. A stack mold requires only about half the clamp tonnage than a single-face mold with same number of cavities.

3)Efficiency and Improved Automation: Stack molds can produce multi-component assemblies in one shot on one plastic injection machine using the same parameters.

Shanghai Olimy is Plastic Injection Parts manufacturer and trader specialized in the research, development and production of Plastic Auto Part，Plastic Industrial Part，Plastic Medical Part，Plastic Cosmetic Part ，Plastic Stationery Part，Plastic Children Toy，Plastic Electronic Part ，Plastic Experimental Part ，Plastic Home Appliance Parts，Plastic Chromeplated Parts，Plastic Other Parts

We are located in Shanghai, with convenient transportation access. All of our products comply with international quality standards and are greatly appreciated in a variety of different markets throughout the world.

If you are interested in any of our Plastic Injection Parts or would like to discuss a custom order, please feel free to contact us. We are looking forward to forming successful business relationships with new clients around the world in the near future.