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Achieving high transparency in recycled polycarbonate requires careful attention to material handling, processing conditions, and contamination control

The inherent clarity of polycarbonate diminishes during recycling due to polymer chain scission, mechanical abrasion, and foreign residue accumulation

To restore and maintain high transparency, the first step is sourcing clean, sorted feedstock

Only clear, uncolored polycarbonate parts should be used, and any materials with labels, adhesives, or other plastics must be removed

Sorting can be enhanced with near infrared technology to ensure purity

After collection, rigorous cleaning is non-negotiable for optical restoration

A high-pressure hot water rinse combined with industrial-grade detergents effectively strips away grime and lubricants

Incomplete drying triggers hydrolytic degradation, resulting in hazy output and weakened mechanical properties

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

Precise control over processing conditions is paramount to preserving clarity

Excessive heat above 300°C triggers irreversible thermal damage

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

Even small fluctuations can cause uneven flow and internal stress-induced haze

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

They inhibit free radical formation and chain scission, sustaining clarity over multiple reprocessing cycles

Some manufacturers also use optical brighteners or clarity enhancers in small amounts to restore visual clarity, but these must be chosen carefully to avoid unintended color shifts

Thermal relaxation after forming improves molecular alignment and optical homogeneity

Rapid quenching induces internal tension that scatters light

Finally, filtering the molten polymer through fine screens or melt filters removes any remaining particulates that could create haze

Regular quality checks using spectrophotometers or haze meters help monitor transparency levels throughout the process

When feedstock purity, thermal control, and post-processing are optimized, recycled PC approaches 90%+ of virgin clarity

enabling use in precision optics, sterile medical housings, and clear display cases