Background: The client recycled PP plastic scraps and needed to separate fibers, metal debris, and unbroken large particles generated during the crushing process.
Challenges: Raw material impurity content reached 8%, with low manual sorting efficiency; Traditional screens were prone to mesh clogging, limiting daily capacity to less than 20 tons.
Solution:
A double-deck linear vibrating screen was selected (10-mesh upper screen for large particles, 40-mesh lower screen for fine impurities);
Screen inclination angle was adjusted to 5° to enhance material flow velocity;
A bouncing ball cleaning device was installed to prevent adhesion of PP fragments.
Results:
Impurity removal rate increased to 95%;
Throughput reached 35 tons/day, with a 30% reduction in electricity consumption;
Purity of finished granules met injection-grade requirements.
Requirement: To classify post-extrusion ABS granules into 0.5-1mm (Grade A) and 1-2mm (Grade B) for diverse customer specifications.
Equipment Selection:
Rotary vibrating screen (1.5kW power, three-layer screen design);
Screen configuration:
Top layer: 12-mesh (1.6mm aperture) for Grade B separation;
Middle layer: 20-mesh (0.85mm aperture) for Grade A separation;
Bottom layer: Fine powder collection.
Key Parameters:
Vibration frequency: 2900 RPM, amplitude: 2.5mm;
Silicone sealing rings to prevent dust dispersion (workshop cleanliness compliance);
304 stainless steel screens with 3x extended wear-resistant lifespan.
Results:
Grading accuracy error <5%;
Hourly throughput of 800kg, with product yield increasing from 82% to 98%;
Customer complaint rate reduced by 90%.
Challenge: Crushed PET flakes contained 5%-10% electrostatic dust, compromising spinning quality.
Innovative Solution:
Ultrasonic vibrating screen + negative pressure dust removal system integration;
Ultrasonic transducer (38kHz) to break up electrostatic agglomeration;
80-mesh screen (0.18mm aperture) to trap dust, with negative-pressure fan suction for collection.
Data Comparison:

Special Requirements:
Compliance with GMP standards, requiring fully enclosed and easy-to-clean equipment;
Screening accuracy of ±0.05mm.
Customized Solution:
Pharmaceutical-grade stainless steel rotary vibrating screen with mirror-polished inner walls (Ra ≤0.4μm);
100-mesh (0.15mm) nylon screen integrated with a CIP (Clean-in-Place) system;
Frequency converter to control vibration intensity (adjustable from 0 to 3000 RPM).
Validation Results:
Passed FDA on-site audit;
Fine powder residue <0.02%;
Changeover cleaning time reduced to 15 minutes.
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