Use and maintenance of screw barrel

As the core component of plastic processing equipment, the correct use and maintenance of the screw barrel are crucial to ensure production efficiency and product quality. The following will introduce the relevant knowledge of the screw barrel in detail from the two aspects of use and maintenance.

1. Use of screw barrel

Temperature control:

Each plastic has its ideal plasticizing processing temperature range. When using the screw barrel, the processing temperature of the barrel should be controlled to be close to this temperature range to ensure that the plastic can be melted evenly and reduce wear.

Before starting the machine, make sure that the barrel and screw have reached the preset temperature and wait for a period of time (such as 30 minutes) to ensure that the temperature is stable.

Speed ​​adjustment:

The speed adjustment should be determined according to the type of plastic and processing requirements. For plastics containing reinforcing agents (such as glass fiber, minerals), a lower speed should be used to reduce wear on the screw and barrel.

During the injection molding process, pay close attention to the changes in speed and adjust in time to avoid uneven plasticization or increased wear due to too high or too low speed.

Feeding management:

Ensure that there are no debris in the plastic raw materials, such as metal chips, nuts and paper clips, which will cause serious damage to the screw and barrel.

If processing recycled materials, a magnetic hopper should be used to prevent metal debris such as iron chips from entering the barrel.

Plastic drying:

The moisture in the plastic will cause wear on the surface of the screw and may affect the quality of plastic products. Therefore, the plastic should be fully dried before injection molding to remove residual moisture.

2. Maintenance of screw barrel

Daily cleaning:

After each shutdown, the residue on the barrel and screw should be cleaned in time to avoid damage to the screw and barrel after hardening.

During the cleaning process, a soft cloth roll or brush should be used to avoid scratching the surface of the screw and barrel with metal tools.

Regular inspection:

The wear of the screw and barrel should be checked regularly, as well as whether the heating mechanism, transmission system, etc. are working properly.

If scratches or wear are found on the surface of the screw and barrel, they should be repaired or replaced in time.

Insulation during shutdown:

If the shutdown time is long (such as more than half an hour), the discharge port should be closed and the material in the barrel should be cleaned, and insulation measures should be set to reduce the heat loss of the barrel and the screw.

Avoid abnormal operation:

During use, the screw should avoid idling and slipping to reduce the wear of the screw and the barrel.

At the same time, it should be avoided to mix incompatible plastics such as POM and PVC into the barrel at the same time to prevent chemical reactions from causing serious industrial accidents.

Professional maintenance:

For professional maintenance of the screw barrel, such as nitriding treatment, alloy casting, etc., it should be handed over to professionals.

When performing professional maintenance, it should be ensured that the materials and processes used meet the relevant standards and requirements.