A white paper that outlines the advantages of using carbon dioxide (CO2) in gas-assist injection molding (GAIM) is available for download on Linde North America’s website.
The white paper, “Reduce Cycle Time in Gas Assist Injection Molding by 20 to 50%: A New CO2 Process,” asserts that cooling cycles can be reduced by more than 50 percent compared to cycles using nitrogen, and overall cycles can often be reduced by 20 to 50 percent.
Using CO2 is in the enhanced gas-assist injection molding or eGAIM process, is a recent development. Traditionally, manufacturers have used nitrogen for gas-assist injection molding, a process used to effectively create hollow plastic parts that have thick but homogeneous walls Typically products created with gas-assist injection molding those for automobiles, household appliances and furniture parts.
As it documents in its white paper, the New Providence, N.J.-based gas provider has found that by replacing nitrogen with CO2, manufacturers can reduce cycle times.
According to Linde, the cooling effect of high pressure CO2 is comparable to that of water in water-assist injection molding (WAIM) ― without many of the difficulties inherent to WAIM.
The paper offers details on how the CO2 gas-assist injection molding process works, identifies the types of parts suited for it, describes the testing process, and compares it to other commonly used methods.