Processing technology for manufacturing spectacle lens from PLA (polylactic acid) particles
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A processing technology and spectacle lens technology, applied in the field of spectacle lenses, can solve the problems of lens pollution, no use of PLA particles, non-environmental protection, etc., and achieve the effects of environmental protection, good production effect and high work efficiency
Pending Publication Date: 2022-03-25
江西科强光学有限公司
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[0004] The purpose of the present invention is to solve the process in the prior art that does not use PLA particles to make spectacle lenses. This process can only produce flat lenses, which are mainly used on the frames displayed in optical s
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Embodiment 1
[0041] refer to Figure 1-4 , the processing technology that PLA particle is made spectacle lens, comprises the following steps:
[0042] S1. Preheating and drying:
[0043] S11, put the PLA particles into a mixer or a vibration box;
[0044] S12. Use a dryer to dry the moisture in the PLA granules, and appropriately increase the drying time, which can reduce the time required for the PLA granules to melt and improve work efficiency;
[0045] S2, melting:
[0046] S21, transporting the dried PLA particles to the extrusion screw, the extrusion screw is covered with an electric heating coil, and the PLA particles are heated until they are completely melted;
[0047] S22, transporting the melted PLA to the injection mold through the extrusion screw;
[0048] S3. Injection molding:
[0049] S31, the first stage of injection, the injection volume accounts for 65% of the mold;
[0050] S32, the second stage of injection, the injection volume accounts for 20% of the mould;
[...
Embodiment 2
[0057] refer to Figure 1-4 , the processing technology that PLA particle is made spectacle lens, comprises the following steps:
[0058] S1. Preheating and drying:
[0059] S11, put the PLA particles into a mixer or a vibration box;
[0060] S12. Use a dryer to dry the moisture in the PLA particles, appropriately increase the drying time, the drying time is 2 hours, and the drying temperature is 50°C, which can reduce the time required for the PLA particles to dissolve and improve work efficiency;
[0061] S2, melting:
[0062] S21. Transporting the dried PLA particles to the extrusion screw, the extrusion screw is covered with an electric heating coil, and the temperature is 220°C, and the PLA particles are heated until they are completely melted;
[0063] S22, transporting the melted PLA to the injection mold through the extrusion screw;
[0064] S3. Injection molding:
[0065] S31, the first stage of injection, the injection volume accounts for 65% of the mold, and th...
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Abstract
The invention belongs to the field of spectacle lenses, particularly relates to a processing technology for manufacturing spectacle lenses by using PLA (polylactic acid) particles, and provides the following scheme aiming at the problems that the existing technology for manufacturing the spectacle lenses by using the PLA particles is not available, the original spectacle lenses are discarded and replaced by the spectacle lenses with degrees after a spectacle frame is selected by a spectacle matching person, and the discarded spectacle lenses cause pollution and are very not environment-friendly. The preparation method comprises the following steps: S1, preheating and drying; S11, putting PLA particles into a stirrer or a vibration box; s12, water in the PLA particles is dried through a dryer, the drying time is properly prolonged, the time needed for dissolving the PLA particles can be shortened, and the working efficiency is improved. The spectacle lens made of the PLA particles can be degraded, the degradation speed is high, the situation that waste is accumulated due to the fact that the spectacle lens cannot be degraded for a long time is avoided, pollution is small, the environment is further protected, and the production cost is reduced. The manufacturing effect is good, the success rate is high, and unqualified lenses are not prone to occurring.
Description
technical field [0001] The invention relates to the technical field of spectacle lenses, in particular to a processing technology for making spectacle lenses from PLA particles. Background technique [0002] Polylactic acid is a new type of biodegradable material made from starch raw materials proposed by renewable plant resources (such as corn, etc.). Starch raw material is made into lactic acid through fermentation process, and then converted into polylactic acid through chemical synthesis, which has good biodegradability, can be completely degraded by microorganisms in nature after use, and finally produces carbon dioxide and water without polluting the environment. The environment is very favorable, and it is recognized as an environmentally friendly material. Polylactic acid has good thermal stability. The processing temperature is 170-230 ° C. It has good solvent resistance, the best tensile strength and elongation. Polylactic acid can also be used in various Produced...
Claims
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