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Counter-pressure is best described as an operation extension of the standard injection molding process. The difference is how we are able to control the melt front of the incoming resin during resin injection. Molten plastic injected into a typical mold will flow in the path of least resistance. In other words, nominal walls fill first and then thinner walls or features are filled and packed nearer the end of the injection sequence. Counter-pressure provides a controlled resistance to the flow front, forcing some of the melt to enter the thinner or harder to fill areas during the initial injection.

Key Advantages & Benefits of Molding Parts with Gas-Counter pressure:

• Physical property improvement due to cells spherical shape and uniform distribution in the whole part.
• Denser surface greatly enhances the fatigue load resistance.
• Greatly improves surface finish.
• Part weight reduction due to foaming process.
• Increased flexural modulus results in more durability from impacts.
• Allows thicker wall sections than straight injection.