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To obtain superior optical clarity in recycled polycarbonate, meticulous control over feedstock, processing parameters, تولید کننده کامپاند پلیمری and impurity removal is essential

While virgin polycarbonate offers exceptional transparency and durability, recycling can compromise its optical performance through heat-induced breakdown, shear forces, and contaminant interference

The foundation of optical recovery begins with selecting uncontaminated, properly segregated raw material

Use only transparent, unmarked PC components—eliminate all stickers, glue residues, and mixed plastic contaminants

Advanced near-infrared (NIR) sorting systems significantly improve separation accuracy

Once collected, the material must be thoroughly cleaned

Washing with detergent and hot water removes dirt, oils, and residues

Moisture must be fully eliminated post-wash to avoid polymer chain breakdown during extrusion

Optimal drying occurs between 120°C and 130°C for 4 to 6 hours

Processing parameters are critical

Maintain melt temperatures strictly between 270°C and 295°C to avoid degradation

Exceeding 300 degrees Celsius can cause thermal degradation, leading to yellowing and loss of clarity

Screw geometry should prioritize gentle conveying over high shear mixing

A narrow processing window with precise temperature control ensures consistent melt flow without overheating

Adding stabilizers such as antioxidants and thermal stabilizers can help protect the polymer during reprocessing

Stabilizers act as sacrificial agents to shield the polymer backbone from heat and oxygen

Selective use of fluorescent whitening agents can recover perceived brightness without altering hue

Post processing steps like annealing can relieve internal stresses that cause light scattering

Rapid quenching induces internal tension that scatters light

Multi-stage filtration ensures particulate-free output for optical-grade applications

Continuous optical monitoring with transmittance and haze analyzers ensures consistency

A holistic approach to recycling enables optical performance indistinguishable from new polycarbonate

making it suitable for demanding applications like lenses, medical devices, and transparent enclosures