The mesh belt screen changer used in the recycling of plastic HDPE film blowing extrusion is a crucial filtering device. It serves to filter out foreign particles and impurities as the plasticized material flows through the screen, ensuring the quality of the extruded products and the continuity of the production process. Below is a detailed analysis of the recycled plastic HDPE film blowing extrusion mesh belt screen changer:
I. Functions and Capabilities
Filtering Function: It filters aged or deteriorated particulate matter produced during the production process, low-precision particulate matter in recycled materials, as well as various non-plastic substances and incompatible plastics in recycled materials.
Quality Assurance: By installing screens of different precision levels, it meets the product process grade requirements.
Efficiency Enhancement: The non-stop screen changing technology ensures the stability of product quality and the continuity of production, thereby saving costs and increasing efficiency.
II. Structure and Characteristics
Structural Composition: The screen changer typically consists of a body, sealing components, porous plates (honeycomb plates), screens, switching devices, and other parts. The material selection of these parts is crucial. Generally, alloy steel should be used, especially for sealing components and switching devices, which require high-quality alloy steel and special heat treatment processes to achieve high hardness and wear resistance, ensuring no deformation under high temperature and pressure, and thus guaranteeing the sealing accuracy of the screen changer and preventing material leakage during long-term use.
Screens: The screens are usually composed of several layers of meshes with different mesh sizes. The outer coarse mesh is sturdy and can prevent larger particles from entering the inner fine mesh prematurely. The innermost finest mesh can filter out the smallest solid particles in the melt flow. The choice of screens depends on the cleanliness of different products and raw materials.
Dual-Channel Dual-Screen Structure: The screen changer is designed with a dual-channel dual-screen structure. During screen changing, one screen is in operation while the other is being replaced, ensuring uninterrupted material flow and production.
Exhaust System: It is equipped with an exhaust structure that can fully remove gases trapped in the material and the porous plate to be replaced, preventing gases from mixing into the product during screen changing, thereby improving product quality.
III. Application and Maintenance
Application Scope: The recycled plastic HDPE film blowing extrusion mesh belt screen changer is widely used in the production of chemical fibers, blown films, flat films, cast films, as well as the manufacture of pipes, plates, wires, fibers, and granulation lines, recycling, and other fields.
Maintenance and Care: Regularly inspect and replace screens to ensure filtering effectiveness; keep the screen changer clean and dry to prevent corrosion and clogging; check the wear of sealing components and switching devices, and replace damaged parts in a timely manner.
IV. Selection and Precautions
Selection: Choose the appropriate screen changer based on the extruder model, production requirements, and raw material characteristics. For example, for materials with good fluidity and high requirements for continuous production, hydraulic pillar continuous screen changers or hydraulic backflush screen changers can be selected; for materials with low fluidity and low requirements for continuous production, hydraulic plate screen changers can be chosen.
Precautions: When installing and using the screen changer, follow operating procedures and safety specifications; ensure good sealing performance of the screen changer to prevent melt leakage; regularly inspect and maintain the screen changer to identify and resolve issues promptly.
In summary, the recycled plastic HDPE film blowing extrusion mesh belt screen changer is an important component in the plastic extrusion production line. Its performance and quality directly affect the quality and production efficiency of the extruded products. Therefore, great importance should be given to its selection, use, and maintenance, with corresponding measures taken.
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