TECHNOLOGY | RECYCLING LINES
Plastics recycling: a guide to stable production
Resul Gokpinar, International Sales & Marketing Specialist at recycling technology group Polystar, presents solutions to seven common plastic recycling operation problems
Different characteristics of each type of plastic waste may cause recycling operations to become challenging from time to time. In most cases, many common problems can be solved with minimum ef- fort when you have user-friendly and flexible plastic recycling machines. Here we present possible solutions to common operational problems during plastics recycling.
1. Material feeding instability Feeding waste materials into plastics recycling machines must be stable to achieve maximum productivity while preventing machine downtime. Excess feeding or insufficient feeding often results in poor production efficiency. Solution: Automatic material feeding systems with a belt conveyor, screw conveyor, or nip roller feeders that work synchronously with the plastic
30 PLASTICS RECYCLING WORLD | October 2023
pelletiser can provide stable material feeding. Polystar’s feeding systems pause or run based on the load of the pelletiser, resulting in maximum feeding efficiency.
2. Contamination of the plastic material Food residue, dirt, oil, and other impurities as well as mixing different types of plastics can contami- nate the recycled pellets and cause a decrease in quality and reusability of them. Contamination also makes the recycling process less efficient, produc- ing more waste while raising costs. Solution: The easiest solution is to ensure that the waste plastics are clean and sorted to their types before they are fed into the recycling machines. Dirty post-consumer plastic waste must be washed and dried before the recycling process.
3. Blockages and hopper bridging Material blockage is generally caused by improp- erly prepared materials or poor maintenance of the machine components. In the hopper-feeding recycling machines, the material might cause bridging because of pieces interlocking with each other or due to the moisture (for tiny particles). Solution: Proper preparation based on type, shape, and condition of the waste material for your
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IMAGE: POLYSTAR
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