Color printing is the first process in the whole production process of colored silicone hydrogel lenses, which is to transfer the pattern of different colors and patterns to the transition area of the mold. The selected pigments are approved by FDA to be used in silicone hydrogel lenses, and the pattern printing adopts the interlayer process, which avoids direct contact between pigments and cornea and ensures that the lenses are safe and comfortable to wear and the color will never fade.
After feeding the material into the mold, the three-stage high-temperature molding is carried out, and the main material filled in the gap between the mold and the template is cured at high temperature to form the lens blank.
The surface of the lens blank is cut after high temperature curing, cutting out the optical area, mixing transition area and edge of the lens. The turning process is the process of forming the optical properties, center thickness, surface, edges and other important quality characteristics of the lens.
Using the aluminum oxide to polish the surface of lenses, remove the turning traces on the surface of the lenses and guarantee the wearing comfort of the outer curved surface of the lenses.
The lenses are placed on an electric hot plate and baked until the molds are sufficiently heated, then the lenses are separated from the molds on the separating machine.
Polishing the lenses surface with aluminum oxide, and then inspecting the surface with 17x magnification.
High temperature water vapor extraction to remove surface residue.
Fill the bottle with protective solution, which is boric acid buffer.
The lenses are put into a sterilizer with a high temperature of 120° for 30 minutes to achieve effective sterilization.
Detect is there any impurity in the finished bottle.
put into the warehouse and rest for 15 days for microbiological test.
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