Injection molding technology continues to embrace and enhanced in every industry around the world since the 1960s. The demand for high-quality and blemish-free products or parts are at its peak. Consumers expect the functional advantages and appearance of the product optimized to meet their satisfaction.
Having any defects or flaws on the products can cause consumers’ dissatisfaction and failure of the whole production. Vacuum Negative Pressure Adsorption Technology ensures the removal of blemishes and defects from the final products in injection molding. It helps in reducing functional failures of the parts and improves the process and quality assurance of the production.
Many industries are steadfast to use negative pressure adsorption technology to give innovative solutions to the injection molding problems, reducing scars and production rates. It ensures bringing high-quality molds to lead production success.
Causes of Welding Line and Air Bubbles in Mold:
Welding lines, bubbles and any defects are the major cause of poor vents when the molten plastic produces low decomposition gases. Proper layout of venting structure into the mold should take into consideration to avoid air traps or bubbles.
Furthermore, unspecific speed, temperature, and pressure during the molding process can cause blemishes resulting in weld lines and bubbles on the products. When the plastic material prepares to inject into the mold and clamping unit; speed, temperature, and pressure shape the mold into the final products.
Advantages of CUMSA Vacuum System?
The CUMSA vacuum system is one of the astonishing technology, delivering innovative solutions to clients for three years all around the world. It provides high-quality molds and products to the consumer.
This vacuum system helps in removing the air from the mold cavity before the plastic materials are ready for injection into the mold. It creates negative pressure to push the flow into the mold in a fraction of a second without causing any defects, air bubbles, and weld lines. Many filling can possible to put in one place. It helps to reduce injection pressure, molding cycling time, and production cost.
Procedures to Design and Install Vacuum Pulling System into the Mold:
How to select the suitable direction to place the vacuum system for perfect sealing? Vacuum system place in the cavity side or where it can work well to gain the proper function of vacuum negative pressure. There are a few working procedures when a mold inserts into the injection molding machine:
- The vacuum starts to remove air from the mold cavity reaching through the venting channel inside the mold, when mold gets closed. (60L/min)
- Once the mold gets filled, the vacuum system in the cavity side will stop and close.
- The gust functions use to separate the impurities by venting channels inside the mold.
- Mold gets open and ejects the parts.
- Mold re-close and then the cycle of the vacuum system restart to perform procedures.
