In the field of medical injection molding processing, a troublesome issue is the discoloration of plastic products during the injection process, which can appear locally, extensively, or even across the entire product. Sometimes, the parts may also contain linear or granular brownish-yellow or black burnt material. This is mainly due to the overheating and decomposition of the plastic or added flame retardants, UV absorbers, etc., in the barrel, or their prolonged stay in the barrel leading to decomposition and burning, which is then injected into the mold cavity with the melt. So, how can we effectively tackle this problem? Below, Yize Mould will provide you with a detailed explanation.

To address the burning issue in medical injection molding processing, we can start from the following aspects:

1. Adjust the filling speed: Reducing the filling speed can prevent the air from being compressed and ignited due to excessively fast injection, thereby reducing the burning phenomenon.

2. Optimize the switchover to holding pressure: Switching to holding pressure when the mold is 95% filled allows the air in the mold cavity to escape, reducing the risk of burning.

3. Enhance ventilation and cleaning: Increasing or cleaning the ventilation grooves ensures that the air in the mold cavity can be smoothly discharged. Cleaning the ejector pins prevents them from becoming clogged with dirt, which can affect the ventilation effect.

4. Change the gate location: Adjusting the gate location can improve the flow path of the melt and reduce the occurrence of burning.

5. Adjust the clamping force: Appropriately reducing the clamping force can help reduce the pressure in the mold cavity, thereby lowering the risk of burning.

6. Lower the melt temperature: Lowering the melt temperature can effectively reduce the overheating and decomposition of the plastic in the barrel, thereby avoiding the burning phenomenon.

In summary, addressing the burning issue in medical injection molding processing requires consideration from multiple aspects, including adjusting the filling speed, optimizing the switchover to holding pressure, enhancing ventilation and cleaning, changing the gate location, adjusting the clamping force, and lowering the melt temperature. Only by comprehensively considering these factors can we effectively solve the burning problem and improve the quality of injection molded products.

Yize Mould Co., Ltd., established in 2007, has been committed to the design and manufacture of precision moulds and the production of precision injection molded products. Headquartered in Dongguan, the manufacturing capital, with convenient transportation and logistics, we specialize in the design, precision mould manufacturing, injection molding and assembly of products such as automotive connectors, medical injection molding, cleanroom injection molding, PFA custom injection molding, as well as providing a complete set of after-sales service solutions. For more professional knowledge or consultation on related services, please call +86 13302615729 (WeChat, WhatsApp same number), and we will sincerely answer your questions.