Production technology for composite co-extrusion PS diffuser plate

Abstract

The invention relates to a production technology for a composite co-extrusion PS diffuser plate, and the technology mainly comprises steps of formula design, material mixing, extrusion, cutting, plate piling and the like. The material mixing step comprises high-speed hot mixing and sieving warehousing. The extrusion step employs a composite co-extrusion technology. A core-layer extruder is taken as a main machine, the main machine employs a screw with the diameter of 130 mm and the draw ratio of 38, and the main machine average rotation speed is 70 r/min. A surface-layer extruder is taken as an auxiliary machine, the auxiliary machine employs a screw with the diameter of 60 mm and the draw ratio of 33, and the auxiliary machine average rotation speed is 60 r/min. The main-machine material canister heating temperature is divided into seven stages, and the temperature is gradually raised. The auxiliary-machine material canister heating temperature is divided into five stages. Through formula design, equipment layout and technological parameter improvement, the diffuser plate is improved in light transmittance, relatively haze and center brightness, and the backlight module covering effect is good.

Description

technical field [0001] The invention relates to the field of preparation of PS diffuser plates, in particular to a production process of composite co-extruded PS diffuser plates. technical background [0002] The light diffusion plate is also called uniform light plate and light expansion plate. It has the characteristics of high light diffusion, high light transmittance and good ability to block light sources. It is an important component in the field of LED lighting and flat panel display. The light diffusing plate can play a role of shading and can block the passage of light. Generally, the better the light diffusing property of the light diffusing plate, the lower the light transmittance. [0003] The existing technology is to adjust the light transmittance and haze of the diffuser plate by adding different amounts of silicone diffusers and inorganic diffusers to GPPS. Since the light transmittance and haze of a single-layer diffuser plate are difficult to increase simu...

AI Technical Summary

Problems solved by technology

Since the light transmittance and haze of a single-layer diffuser plate are difficult to increase at the same time, in a backlight module that requires high shading, the increase in the haze of the diffuser plate will reduce the luminance of the entire module

Therefore, the diffusion plate with composite structure has become the solution to this problem, but the current domestic production process of composite diffusion plate is immature. And other issues are important factors affecting the light transmittance and haze of the composite diffuser

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