Pressure-resistant screen changer

Product Name: Compression Screen Changer

I. Core Functions and Working Principles

Core Functions:

1. Continuous Filtration under High Pressure:In the high - pressure (usually 10 - 50 MPa) melt flow at the extruder outlet, the melt is forced through a high - precision filter screen to effectively intercept solid impurities such as carbides, gel particles, metal chips, and unmelted substances, ensuring the purity of the discharged material.

2. Screen Changing without Shutting down:When the screen is clogged and the head pressure rises to the set value, the screen - changing slide plate or sleeve is driven by the hydraulic system.Instantly (0.1 - 2 seconds), the clogged dirty screen working position is moved out of the melt flow channel, and at the same time, a new working position with a pre - installed clean filter screen is moved in.Throughout the process, the melt flow is uninterrupted, and production continues without interruption.

3. Stable Extrusion Pressure and Quality:Through fast and smooth screen - changing actions, fluctuations in melt pressure and temperature are minimized, avoiding quality problems such as broken strips, uneven thickness, and decreased output caused by screen changing.

II. Main Structural Components

• Ultra - High - Pressure Heavy - Duty Body:It usesHigh - quality alloy steel (such as 34CrNiMo6)After precision machining and heat treatment (quenching and tempering, nitriding), it has extremely highFatigue resistance, creep resistance, and corrosion resistanceand can withstand high temperature and high pressure for a long time.

• Hydraulic Drive System:

  • Hydraulic Cylinder

• Screen - Changing Slide Plate (Core Moving Part):

  • Materials and Processes:It usesSpecial high - temperature alloy steelThe surface undergoesUltra - hardening treatment (such as boronizing, hard chrome plating)andHigh - precision grindingto ensure smooth sliding, wear resistance, and reliable sealing under high temperature and high pressure.

  • Heating and Temperature Measurement:It has built - inHeating rods and thermocouplesto achieve precise control consistent with the body temperature, preventing the melt from cooling and solidifying at the slide plate gap.

• High - Efficiency Sealing System:

  • Multi - layer Combined Sealing:It uses\u201CMetal seal + Flexible graphite seal + Spring - energized seal\u201Dand other multiple sealing combinations to ensure absolutely no leakage for a long time under a high temperature of 370°C and a high pressure of 50 MPa.

III. Core Features and Advantages of the Product

• Extremely High Reliability and Safety:Designed specifically for extreme working conditions, it eliminatesMelt leakage (material running out)major safety accidents caused by material fatigue or seal failure, ensuring the safety of personnel and equipment.

• Excellent Filtration Effect and Stability:The flow channel design is optimized, the filter screen area is large, the dirt - holding capacity is strong, and the screen - changing process has minimal impact on the melt pressure, temperature, and output, resulting in highly consistent product quality.

• Long Service Life and Low Maintenance Cost:The key components use top - grade materials and processes, and the design service life is long. The modular design makes maintenance easy, and the main sealing parts can be replaced online.

• Wide Process Adaptability:

  • Suitable for almost all plastic pelletizing processes:Such as pelletizing of new and recycled materials of PP/PE/ABS/PET/PA/PC, filler modification, cable material, and masterbatch production.

  • Suitable for High - Viscosity Materials:Such as UHMW - PE, TPU, highly filled materials (calcium carbonate, glass fiber).

• Energy Saving and Efficiency Improvement:Screen changing without shutting down avoids the huge waste of energy and time caused by heating up, cleaning the machine, and introducing materials during traditional shutdown screen changing, significantly improving equipment utilization and comprehensive production capacity.

IV. Key Application Scenarios and Technical Parameters

• Typical Application Scenarios:

  • Plastic Recycling Pelletizing Line:It filters impurities such as sand, metal, and charred materials in recycled materials and is aNecessary equipmentfor producing high - quality recycled particles.

  • Modified Plastic Production Line: Filter glass fibers, filler agglomerates and gels produced during the manufacturing process.

  • Color masterbatch and functional masterbatch production line: Ensure uniform dispersion of pigments or additives and filter out coarse particles.

  • Granulation of high - end special materials: Such as materials with extremely high purity requirements, like medical devices and auto parts.