Publisher: Administrator Date: 2023-11-02
Needle valve hot runner is a widely used hot runner system that is supplied by major international hot runner suppliers. This system is designed to open or close the gate through mechanical movement at a predetermined time, using a valve needle controlled device.
This type of hot runner system has many advantages that cannot be achieved by hot tip and sleeve runner systems. If the gate opening and closing time can be manually controlled, the gate lubrication can be flat, and the application scope of hot runner technology can be expanded.
1、 Needle valve hot runner is widely used in many fields such as sedan manufacturing, medical, electronics, office equipment, etc.
In recent years, major international car companies have chosen valve type hot runners and combined them with the multi-color co injection process in the mold to produce all car lampshades. As the lampshade is a transparent product, the gate must be lubricated and flat to meet the beauty requirements. This can only be achieved by using a valve gate hot runner. Some other car parts need to be painted and colored after forming. If there are injection molding fusion lines on these parts, the color of the colored parts will be different and cannot meet the quality requirements. To prevent such problems, many car parts suppliers choose a production process that switches the gates according to the order of needle valve hot runners to completely eliminate the fusion line on the parts. In the medical field, people have extremely strict requirements for the quality of plastic parts for medical use, such as using timing controllers, which cannot have sharp protrusions. Otherwise, if the skin is punctured or punctured during use, the consequences will be severe. In this case, it is also necessary to rely on the valve gate runner system to improve the quality of the product gate.
2、 The mechanical action equipment of the needle valve hot runner can be controlled by hydraulic oil or compressed gas.
The valve needle switch action is powerful and accurate using hydraulic oil method. But it is possible to stain plastic parts during the production process. Therefore, when producing medical plastic products, it is necessary to use compressed gas control methods to ensure the cleanliness of the products. In addition, the use of valve needle control equipment will increase the height of the fixed mold and the entire mold. When designing molds and selecting injection molding machines, consideration should be given. A cooling channel is also required on the template for installing valve needle control equipment.
The application requirements of needle valve hot runner are the same as those of hot tip and sleeve hot runner systems. If the temperature control at the valve gate is not good, it will also pose serious production difficulties. For example, if the temperature at the gate is too high, there is a risk of plastic sticking to the valve needle during mold opening. On the contrary, if the temperature at the gate is too low, the plastic at the gate is too cold, which makes it difficult to seal the valve needle. Valve gate hot runner molds are more expensive than hot tip and sleeve hot runner molds in terms of price. If the design and manufacturing of the valve type hot runner system and valve needle control equipment are not good, problems such as forming a flow dead angle behind the valve needle or overflowing on the sliding fit surface between the valve needle and other parts may occur. If the valve needle is not manufactured well and the sealing action is not operated properly, there may also be serious consequences of damaging the gate. So although the valve hot runner system has many advantages that the other two types of hot runner systems do not have, it also increases the complexity of the mold. Hot runner system for flip chip molds
The above is the content shared today, hoping to be helpful to everyone.