Are there any specific temperature or processing considerations when using a bimetallic screw barrel?- Zhoushan Jiading Plastic Machinery Co., Ltd.

When using a bimetallic screw barrel in plastic extrusion or injection molding processes, there are some temperature and processing considerations to keep in mind:

1.Temperature Control: Bimetallic screw barrels are designed to withstand higher operating temperatures compared to standard screw barrels. It is essential to maintain precise temperature control to prevent overheating or damage to the bimetallic layer. The temperature should be carefully regulated based on the specific material being processed.

2.Heat Distribution: The bimetallic layer in the screw barrel plays a crucial role in providing efficient heat transfer during the plasticization process. It helps distribute heat uniformly along the barrel, promoting proper melting and mixing of the plastic material. Optimizing the temperature profile along the barrel is important for achieving consistent melt quality.

3.Material Compatibility: Different plastic materials have different processing temperature ranges. It is important to ensure that the temperature settings of the bimetallic screw barrel are compatible with the specific material being processed. Exceeding the recommended temperature limits can lead to degradation of the plastic or cause issues like thermal degradation, poor melt quality, or excessive wear.

4.Cooling System: In some cases, a cooling system may be required to prevent overheating of the bimetallic screw barrel during prolonged operation or when processing high-temperature materials. This helps maintain the integrity of the bimetallic layer and prevents excessive wear due to heat exposure.

5.Screw Speed and Pressure: The screw speed and pressure settings should be appropriately adjusted based on the specific material being processed and the desired output. It is important to avoid excessive shear or back pressure, as it can lead to excessive friction and wear on the bimetallic screw barrel.

6.Cleaning and Maintenance: Regular cleaning and maintenance of the bimetallic screw barrel are important to remove any residual plastic or contaminants that can affect its performance. It is recommended to follow the manufacturer's guidelines for cleaning procedures and intervals.

It is crucial to consult the manufacturer's recommendations and guidelines specific to the bimetallic screw barrel being used, as different manufacturers may have varying temperature and processing considerations based on their design and materials used.

Twin extruder Bimetal screw and barrel

The bimetallic barrel for single screw extruder is a kind of barrel spray 2-5mm thick alloy coat on the barrel inner wall which has excellent corrosion resistance, abrasion resistance and high working temperature. And its useful service life is greatly improved contrast to common nitrided barrel. Bimetal has more obvious advantages when processing special plastics to enhance the abrasion life, such as engineering plastics, fluoride plastics, PPO etc. Our company use special alloy powders being sprayed and welded on the top of screw flights, and use different alloys and welding methods.