A compact system for precise gravimetric dosing of sand and shredded plastic, mixing by recipe, and feeding into an extruder. Carbon black pigment is metered by a separate weighing doser directly above the extruder. Control is via a Constanta Vaga cabinet with a KV-4 controller.

What it does

• Accurate component dosing to the operator-set recipe ratios
• Stable, even extruder feeding
• Counting of doses/cycles with cumulative totals per recipe
• Reduction of human error and repeatable quality

How it works

1. A two-compartment storage hopper holds sand (compartment 1) and shredded plastic (compartment 2).
2. By the selected recipe, components are weighed and discharged onto a horizontal weighing conveyor to form a 10 kg batch.
3. The mix transfers to an inclined conveyor that feeds the extruder.
4. A weighing pigment doser above the extruder adds carbon black directly into the feed zone.
5. The control cabinet coordinates sequence, setpoints, pauses, alarms, and data logging.

System composition

• Two-compartment storage hopper on a rigid frame
• Dosing/discharge unit to the weighing conveyor
• Horizontal weighing and inclined belt conveyors
• Weighing pigment doser (carbon black) above the extruder
• Control cabinet:  600×800×250, IP54, KV-4 controller, pushbuttons and signal lights (labels in Ukrainian)
• Sensors, drives, cabling — per project

Control & operation

• KV-4 stores in non-volatile memory: total mass per component, total mix mass, and number of doses per recipe
• Pushbuttons: START / STOP / Recipe Select
• States: Stopped, Dosing, Pause (second STOP → full stop; resume from Pause continues the interrupted cycle)
• Manual mode for maintenance (individual actuators with the dosing cycle stopped)
• Alarm indication and on-screen prompts

Capacity & accuracy

• Throughput: ~1 t/shift (≈ 125 kg/h)
• Cycle rate: ≈ 13 doses/h, 10 kg per dose (≈ 4.5 min/cycle)
• Recipe (by mass): sand 70%, plastic 28%, pigment (carbon black) 2%
• Accuracy: ≤ ±1%
  • sand: 7.00 kg ± 0.07 kg
  • plastic: 2.80 kg ± 0.02 kg
  • pigment: 0.200 kg ± 0.002 kg

Advantages

• Gravimetric control of each component → uniform extruder loading and consistent product
• Fast recipe changeover; cumulative statistics by recipe
• Compact footprint and easy service access
• Industrial reliability; protected enclosure IP54

Options

• Expansion to 3+ components; extra hopper sections
• Communication (Modbus RTU/TCP) for MES/SCADA integration
• Dust collection, hopper lids, wall vibrators
• Stainless execution for product-contact parts