Diffuse-reflection brightness enhancement film and preparation method thereof

A technology of diffuse reflection and brightness enhancement film, applied in optics, instruments, optical components, etc., can solve the problems that the brightness enhancement film cannot be achieved, unfavorable to simplify production, adverse environmental effects, etc., to increase the light mixing effect, avoid light and shadow, increase The effect of the brightening effect

Active Publication Date: 2014-05-28

NINGBO DXC NEW MATERIAL TECH

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AI-Extracted Technical Summary

Problems solved by technology

In view of the disadvantages of complex process procedures and low production efficiency, it is not conducive to simplifying production, and it will cause certain adverse effects on the environment.

In the actual use process, users will require t...

Method used

With reference to Fig. 1, a kind of diffuse reflection incremental film comprises PET base film 1, also is compounded with one deck PETG layer 2 on described PET base film 1, and the surface of described PETG layer 2 has several rows parallel to each other The adjacent arc-shaped protrusions are connected to...

Abstract

A diffuse-reflection brightness enhancement film comprises a PET (polyethylene terephthalate) base film, wherein a PETG (polyethylene terephthalate glycol) layer is composited on the PET base film, a plurality of rows of arc-shaped bulges are arranged on the surface of the PETG layer, and bulge points are arranged on each row of arc-shaped bulges. A preparation method of the diffuse-reflection brightness enhancement film comprises the steps as follows: firstly, a mold pressing base film is prepared, wherein preparation of the mold pressing base film comprises the steps as follows: A, a PETG raw material is fed into an extruder and extruded in a melted manner; B, a PET raw material is fed into the other extruder and extruded in a melted manner; C, the PETG raw material and the PET raw material are melted and then pass through a co-extrusion mold head, and a casting piece is formed on a quenching roller; D, the casting piece is stretched longitudinally after being preheated; E, the piece stretched longitudinally is preheated again and then stretched transversely; and F, the mold pressing base film is obtained after thermoforming and cooling of the piece stretched transversely; and the mold pressing base film is mounted into a mold press for mold pressing after being obtained. Co-extrusion and mold pressing methods are adopted, so that the production speed is increased greatly, various defects in a coating process are avoided, and the yield is increased.

Application Domain

Optical elements

Technology Topic

QuenchingPolyethylene terephthalate glycol +7

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Examples

Experimental program(5)

Example Embodiment

[0020] Example one

[0021] Reference figure 1 , A diffuse reflection incremental film, comprising a PET base film 1, on which a PETG layer 2 is compounded, and the surface of the PETG layer 2 has several rows of arc-shaped protrusions parallel to each other, Adjacent arc-shaped protrusions are connected to each other, and each row of arc-shaped protrusions has bumps 3. In this embodiment, the convex point is a convex tip in the shape of a triangular pyramid. Of course, the convex tip may also have other shapes. The convex tip of the triangular pyramid has the best light mixing effect on light.

[0022] The above-mentioned method for preparing the diffuse reflection brightness enhancement film firstly prepares a molded base film, and the preparation of the molded base film includes the following steps:

[0023] A. Feed the PETG raw materials into the extruder, melt and extrude, and set the extruder temperature at 150°C;

[0024] B. Feed the PET raw material into another extruder, melt and extrude, and set the extruder temperature at 280℃;

[0025] C. After the PETG raw material and PET raw material are melted, they pass through the co-extrusion die, and then form a cast sheet on the quench roll. The temperature of the quench roll inner cylinder is cold water to 35°C, and the thickness ratio of the PET base film and the PETG layer is controlled to be 1: 1;

[0026] D. After preheating, the cast piece is stretched longitudinally, the preheating temperature is 65°C, the stretching temperature is 55°C, and the stretching ratio is 4.0 times;

[0027] E. The longitudinally stretched film is preheated and then stretched transversely. The preheating temperature is 110°C, the stretching temperature is 110°C, and the stretching ratio is 3.6 times;

[0028] F. The transversely stretched film is shaped at 220°C for 3 seconds, and finally cooled, rolled and slit to obtain a molded base film;

[0029] After the molded base film is obtained, the molded base film is loaded into the molding press, the preheating roller temperature is 160°C, the plate roller temperature is 105°C, and the plate roller surface has a mold surface corresponding to the arc-shaped protrusions and bumps on the surface of the PETG layer. The locomotive speed is 10 m/min, and the molding is carried out under the pressure of 50kg.

Example Embodiment

[0030] Example two

[0031] Reference figure 1 , A diffuse reflection incremental film, comprising a PET base film 1, on which a PETG layer 2 is compounded, and the surface of the PETG layer 2 has several rows of arc-shaped protrusions parallel to each other, Adjacent arc-shaped protrusions are connected to each other, and each row of arc-shaped protrusions has bumps 3. In this embodiment, the convex point is a convex tip in the shape of a triangular pyramid. Of course, the convex tip may also have other shapes. The convex tip of the triangular pyramid has the best light mixing effect on light.

[0032] The above-mentioned method for preparing the diffuse reflection brightness enhancement film firstly prepares a molded base film, and the preparation of the molded base film includes the following steps:

[0033] A. Feed the PETG raw materials into the extruder, melt and extrude, and set the extruder temperature at 160°C;

[0034] B. Feed the PET raw material into another extruder, melt and extrude, and set the extruder temperature at 260°C;

[0035] C. After the PETG raw material and PET raw material are melted, they pass through a co-extrusion die, and then form a cast sheet on the quench roll.

[0036] Make the temperature of the inner cylinder of the quench roll with cold water to 33℃, and control the thickness ratio of PET base film to PETG layer to 10:1;

[0037] D. After preheating, the cast piece is stretched longitudinally, the preheating temperature is 60℃, the stretching temperature is 52℃, and the stretching ratio

[0038] 3 times;

[0039] E. The longitudinally stretched film is preheated and then stretched transversely. The preheating temperature is 100℃ and stretched

[0040] The temperature is 100℃, and the stretching ratio is 4 times;

[0041] F. The transversely stretched film is set at 290°C for 8 seconds, and finally cooled, wound and slit to obtain a mold

[0042] Pressure base film

[0043] After the molded base film is obtained, the molded base film is loaded into the molding press, the preheating roller temperature is 70°C, the plate roller temperature is 120°C, and the plate roller surface has a mold surface corresponding to the arc-shaped protrusions and bumps on the surface of the PETG layer. The locomotive speed is 10 m/min, and the molding is carried out under the pressure of 90kg.

Example Embodiment

[0044] Example three

[0045] Reference figure 1 , A diffuse reflection incremental film, comprising a PET base film 1, on which a PETG layer 2 is compounded, and the surface of the PETG layer 2 has several rows of arc-shaped protrusions parallel to each other, Adjacent arc-shaped protrusions are connected to each other, and each row of arc-shaped protrusions has bumps 3. In this embodiment, the convex point is a convex tip in the shape of a triangular pyramid. Of course, the convex tip may also have other shapes. The convex tip of the triangular pyramid has the best light mixing effect on light.

[0046] The above-mentioned method for preparing the diffuse reflection brightness enhancement film firstly prepares a molded base film, and the preparation of the molded base film includes the following steps:

[0047] A. Feed the PETG raw materials into the extruder, melt and extrude, and set the extruder temperature at 170°C;

[0048] B. Feed the PET raw material into another extruder, melt and extrude, and set the extruder temperature at 270℃;

[0049] C. After the PETG raw material and PET raw material are melted, they pass through a co-extrusion die, and then form a cast sheet on the quench roll.

[0050] Make the temperature of the inner cylinder of the quench roll with cold water to 25℃, and control the thickness ratio of PET base film to PETG layer to 3:1;

[0051] D. After preheating, the cast piece is stretched longitudinally, the preheating temperature is 50℃, the stretching temperature is 60℃, and the stretching ratio

[0052] 3.5 times;

[0053] E. The longitudinally stretched film is preheated and then stretched transversely. The preheating temperature is 130°C and stretched

[0054] The temperature is 120℃, and the stretching ratio is 3.5 times;

[0055] F. The transversely stretched film is set at 240°C for 5 seconds, and finally cooled, wound and slit to obtain a mold

[0056] Pressure base film

[0057] After the molded base film is obtained, the molded base film is loaded into the molding press, the preheating roller temperature is 120°C, the plate roller temperature is 150°C, and the plate roller surface has a mold surface corresponding to the arc-shaped protrusions and bumps on the surface of the PETG layer. The locomotive speed is 10 m/min, and the molding is carried out under the pressure of 100 kg.

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Classification and recommendation of technical efficacy words

Improve yield
increase production speed

Diffuse-reflection brightness enhancement film and preparation method thereof

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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