2results about How to "Avoid flow marks" patented technology

The application discloses a COF modified blue dye, a lens coating, a lens and a preparation method and application thereof, and belongs to the technical field of resin lenses. The preparation method of the COF modified blue dye comprises the following steps: step one, preparation of COF powder; and step two, preparation method of the COF modified blue dye: 1 part by weight of the COF powder is dispersed in 5-10 parts by weight of a 5-8 wt% HCl aqueous solution to obtain a COF dispersion liquid; 1-3 parts by weight of a blue dye is dissolved in 10-30 parts by weight of DMSO, and a blue dye dispersion liquid is obtained after uniform mixing; the COF dispersion liquid and the blue dye dispersion liquid are uniformly mixed, and then a polydimethylsiloxane stabilizer is added; and after freeze-drying and crushing, the COF modified blue dye is obtained. The lens coating obtained by the application has the advantages of uniform dispersion of the blue dye, excellent reflection of blue light, clear vision without distortion, no problems of spots and flow marks, high yield and suitability for industrial mass production.

The application discloses a mold structure for solving the problem of local weld marks of injection products, which comprises a heater, a heat-conducting block, a heat-insulating sleeve and a fixed mold core. One side of the fixed mold core is provided with a cavity matched with a movable mold core, and the other side of the fixed mold core is provided with a blind hole into which the heat-conducting block is inserted, and the blind hole is arranged at a position corresponding to the melt confluence position of the product in the cavity. The heat-conducting block is provided with the heater, and the end of the heat-conducting block inserted into the blind hole is provided with a lower surface abutting against the bottom of the blind hole. The heat-conducting block is provided with the heat-insulating sleeve between the outer periphery of the heat-conducting block and the side wall of the blind hole. The end of the heat-conducting block provided with the lower surface is provided with oppositely arranged first and second inclined surfaces, and the first and second inclined surfaces are respectively located on the two sides of the lower surface. The first inclined surface is inclined along the melt flowing towards the side where the first inclined surface is located, and the second inclined surface is inclined along the melt flowing towards the side where the second inclined surface is located. The weld marks of the products which are not suitable for high-gloss molds are improved.