uses the pmma as the base material the temperature of the injection is below 230 u00b0 c preferably 180 200 u00b0 c if pc is the base material the temperature of the injection is below 250 u00b0 c preferably 220 245 u00b0 c other material could be used such as pet polyamide fiber nylon 6 nylon 6 6 nylon1 polyester fiber pbt ptt polyacrylonitrile fiber acrylic fiber polyethylene fiber polypropylene fiber pp polyvinylalcohol fiber pva polyvinylchloride fiber pvc polytetrafluoroethylene fiber ptfe polyurethane fiber pu hmpe pps please refer to fig1 the polymer fiber material base material is mixed with the photochromic dye and the temperature is raised to melting the polymer fiber material and the photochromic dye is distributed evenly within the melted polymer step 110 the next step is drawnwork procedure to form the yarn with the dye thereof step 120 the next step is to perform the spinning weaving process to allow the yarn to be the fiber step 130 the fiber may be used to manufacture cloths hat sock glove pan skirt umbrella which includes the photochromic dye to absorb the uv radiation and change the color to allow the user u201c see u201d the anti uv effect the temperature of the melting may be 180 200 200 220 220 230 230 250 u00b0 c 250 300 u00b0 c depending on the chosen polymer.