Chemical Industry

• 01

  Impurity Screening of PP Recycled Material (A U.S. Environmental Technology Company)

  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.

• 02

  ABS Engineering Plastic Granule Size Classification (A German Modified Plastic Manufacturer)

  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%.

• 03

  Removal of Electrostatic Dust from PET Flakes (A UK Chemical Fiber Company)

  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:
  

• 04

  High-Precision Screening of Medical-Grade PE Granules (A Brazilian Medical Device Supplier)

  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.