3000KN 4RT Dual Vacuum Compression Molding Machine For Heat Exchange Gasket

3000KN 4RT Dual Vacuum Compression Molding Machine for Heat Exchange Gasket Molding

 
Rubber Injection Molding Machine Pre-plastic Injection Device:

• The pre-plastic injection device is composed of plasticized and injection parts. Its function is to uniformly heat and plasticize the rubber compound. The plasticized rubber compound is injected into the cavity through the nozzle, and the injection pressure is held to make the glue in the cavity. The material is connected for a certain time under the set pressure, in order to prevent the rubber material from flowing backwards, resulting in loose structure and uncompromising appearance. The pressure of the holding pressure is usually 80-120 MPa, and the high one can reach the actual injection pressure of 60%-80%. According to the credential history, when the pressure of holding pressure is about 80% of the actual injection pressure, the amount of finished product obtained is higher than that. Therefore, the requirements for the injection device are: strong plasticizing power, sufficient injection pressure, injection rate, and accurate metering of the feed.
• In recent years, with the rapid growth of modern high technology, higher requirements have been placed on the amount of finished rubber. However, the demand for large-scale rubber products has also increased greatly. The screw reciprocating injection machine has a certain limit of the capacity and pressure of the injected finished product. The screw plunger injection molding machine has gained new growth and application. The new plunger type injection device with pre-plastic device installs the hydraulically driven plasticizing screw in the injection piston and accepts the "first-in-first-out" (FIFO) injection method. The layout is shown in Figure 1. The compound is still plasticized using a screw-barrel, which typically places the injection cylinder symmetrically on either side of the screw. When injecting, the axial position of the screw and the barrel is stable, and the check valve at the head of the plunger closes the groove, and the screw is injected into the cavity with the plunger of the rubber injection molding machine.

The main features of the rubber injection machine:

1. Simplify the process, which can realize high temperature and rapid vulcanization of rubber products and shorten the production cycle;
2. The product size is accurate, physical and mechanical properties are uniform, high quality, especially suitable for the formation of thick-walled products;
3. The high rate of genuine, less raw edges;
4. Simple operation, reduced labor intensity, high degree of mechanization and automation;
5. The mechanism of the injection machine and its mold is relatively complicated, the investment is large, the maintenance and maintenance level is relatively high, and it is mostly used for the production of large-volume molded products;
6. At present, there are many types of injection machines in the world, which are divided into plunger type and screw type according to the plasticizing method of the rubber compound; hydraulic type and mechanical type according to the type of machine transmission; according to the type of the mold clamping device, there are straight Press type, hydraulic mechanical type and secondary action type; according to the configuration of the machine parts, there are bedroom, vertical, angle, multi-mode injection machine and so on.

Main Parameters for Other Machines:

 
 
 

 
Finished Product: