Method and device for producing polarizing film having local polarization effect

Abstract

The invention relates to a method for producing a polarizing film having local polarization effect. The PVA undergones the processes of washing, swelling, stretching, dying crosslinking, stretching again, washing and stoving. The method is characterized in that: the liquid feed control system automatically controls the dying bumps (4) to dye. A device for producing the polarizing film having the local polarization effect has a completely transparent lens and does not polarize light. Only the exterior viewing position of human eye pupils on the middle upper part of the lens has polarized light discoloration effect in small areas. A polarizer is combined with a liquid crystal light valve to realize depth change of colors in the process of electronic control so as to achieve the effects of making drivers clearly see pavements during driving at night, shielding highlight and reducing dazzling.

Description

technical field [0001] The invention relates to the field of polarizing film production, in particular to a device and a production method of a polarizing film with partial polarization effect. The partially polarized polarizing film is specially used for the lens production of the light-shielding glasses that prevent glare when passing cars at night. Background technique [0002] The lenses of commercially available polarized sunglasses, polarized fishing glasses, polarized driver's glasses and other polarized glasses are all made of polarizers with the same overall polarization degree of the lens. The entire PVA film surface is uniformly dyed and adsorbed with dichroic iodine or dyes. The overall light transmittance is between 25% and 45%. After being sandwiched with a protective layer, it is cut and processed into sun lenses, which use the polarizing effect to block sunlight during the day. It has excellent use effect under strong reflected light. But at night, because ...

AI Technical Summary

Problems solved by technology

But at night, because polarized lenses have a uniform degree of polarization as a whole, the light transmittance is no more than 45%. The light transmittance reaches the mandatory standard of 75%, so the polarizing film glasses lenses made by this process cannot be used well at night

The above-mentioned limitations can be solved by using partially polarized polarizing film, that is, the lens is transparent as a whole, non-polarized, and only has a small area of ​​polarized color-changing effect in the upper middle part of the lens where the human pupil looks outside the pupil, but so far, there is no such kind in the market. The advent and sale of the product, and the production process and related patent literature and reports on the production and manufacture of partially polarized polarizing films have not been consulted.

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