Plastic extruder screen changer selection

The key points of plastic extrusion screen changer selection mainly include the following aspects:

I. Output and Material Characteristics

Output: According to the customer's annual output, combined with the theoretical output of the screen changer is adjusted to meet the actual production demand. Different types of screen changer for different sizes of production lines.

Material Characteristics: The viscosity, composition and impurity content of the material will affect the screen changer selection. High viscosity materials may need to have a stronger shear and higher pressure screen changer to deal with; contains more impurities in the material may need to have a larger filtering area of the screen changer to filter impurities.

II. Extruder type and model

The type (e.g., single-screw, twin-screw) and model of the extruder will affect the choice of screen changer. The screen diameter should normally not be lower than the screw diameter to ensure filtration and productivity. Therefore, when selecting the screen changer, the specific type and model of the extruder need to be considered to ensure compatibility between the two.

III. the process requirements

Continuity: According to the requirements of production continuity, you can choose to stop the screen changer or non-stop screen changer. Non-stop screen changer can be in the case of no downtime to change the screen operation, applicable to the production of high demand for continuity of the occasion.

Filtration accuracy: According to the process requirements, choose to install different accuracy levels of the screen, in order to achieve the product process level requirements.

Additional functions: some screen changers have automation functions, such as automatic temperature control, material pressure measurement and control of automatic alarms and high-pressure dirt relief system, etc., these functions can meet the user's special requirements for the process.

IV, the screen change

Screen change is mainly divided into two categories of manual screen change and automatic screen change.

Manual screen changer: compact size, easy to install and energy saving, but requires manual operation, suitable for small-scale or low production line.

Automatic screen changer: relying on the hydraulic system or motor drive, can realize rapid screen change, improve production efficiency, but the price may be higher. The choice needs to be weighed against production needs and budget.

In summary, the selection of plastic extruder screen changer needs to comprehensively consider the output and material characteristics, extruder type and model, process requirements and screen changing methods and other factors. Through scientific and reasonable selection, can ensure that the screen changer in the plastic extrusion line to play the best effect.

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