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Recycling - A Guide to Continuous Regrind Process

Recycling - A Guide to Continuous Regrind Process. More than just Waste???. More than just Waste???. Example 1: Using 1000kg/month of Acetal (£2.84/Kg). Weight of the runner system is 100Kg (10% of Part weight), which means you are throwing away £284/month and £3408/year .

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Recycling - A Guide to Continuous Regrind Process

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  1. Recycling - A Guide to Continuous Regrind Process

  2. More than just Waste???

  3. More than just Waste??? • Example 1: Using 1000kg/month of Acetal (£2.84/Kg). Weight of the runner system is 100Kg (10% of Part weight), which means you are throwing away £284/month and £3408/year. • Example 2: Using 5000kg/month of PP (£0.95/Kg). Weight of the runner system is 1000Kg (20% of Part weight), which means you are throwing away £950/month and £11,400/year. Don’t forget Storage cost, Handling cost, Collection cost, Transportation cost, Tax liability?

  4. Feeder (Dryer) Runners Grinder Virgin resin Parts Continuous Regrind Process

  5. % portion of resin that has been moulded x times 70 30% regrind 50% regrind 80 50 60 40 21 25 20 13 6 3 6 2 3 0 2 > 1 1 > 1 1 5 6 3 4 2 1 6 4 5 7 8 3 2 Times passed through the machine Melt Quality Regrind For example, if 30% regrind is used in a continuous operation, only 2% of the regrind has passed through the machine 4 times and less than 1 % has passed through the machine 6 times or more.

  6. Example: Delrin* Acetal Resin Homopolymer Copolymer Degradation-1500 free molecules Degradation-40 free molecules + 2 shorter chain segments

  7. Example: Sarlink* TPR Require grinders with properly adjusted, very sharp knives and may need considerable cooling, especially for the softer grades.

  8. Properties (%) 115 Tensile strength 110 Elongation 105 Unnotched Charpy 100 95 Flex-modulus 80 0% 10% 20% 30% 40% 50% 60% Regrind level Example: Zytel* GR Nylon 6.6 Glass fibre reinforced materials shows higher sensitivity to recycling, due to the breakage of fibres during the regrinding process. Ideally ground hot to minimise glass fibre breakage.

  9. Example: FR Plastics This includes, but is not limited to, the restricted use of regrind thermoplastic material to amounts less than 25% unless specified in the individual Recognitions.

  10. Keep in Mind • Higher the quality of the regrind, higher the quality of the finish part. • Treat the regrind as if it’s virgin material. • Maintain a constant ratio of virgin resin to reground material. • Particle size of reground material to be uniform and similar to the virgin material. • Make sure the grinder blades are kept sharp and properly set to minimise fines. • Clean grinders and regrind containers frequently. Finally, MUST establish the proper ratio of virgin material to regrind, to give the right performance for your particular application.

  11. A Polymer for Every Application

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