The primary reasons for the absence of striations in Optical Colored Filter Glass after polishing include high raw material purity, furnace structure, and forming methods.
First, the high purity of raw materials is one reason why optical glass exhibits no striations after polishing. Optical glass requires raw materials with a purity exceeding 99%, featuring low impurity content typically below a few parts per million. This high-purity material minimizes impurities and inhomogeneities generated during melting, thereby preventing striations after polishing.
Second, furnace structure and forming methods also influence striation formation in optical glass. Optical glass furnaces typically employ ceramic or platinum refractories and are divided into melting, regulating, refining, and homogenizing chambers. This structure effectively minimizes agitation during forming, thereby reducing striations. Additionally, forming methods such as casting, rolling, and tank-breaking techniques help prevent striations caused by agitation.
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Finally, control factors during the melting process. Strictly regulating process parameters and weighing at the raw material stage ensures uniform mixing and melting of the batch, thereby reducing striations. Should issues arise, prompt analysis, rectification, and error correction prevent problem escalation.
In summary, the absence of streaks in polished optical glass primarily stems from three factors: high-purity raw materials, optimized furnace design and forming techniques, and stringent control over the melting process.