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Foamed sheet for reflectors, reflectors, and process for production of the sheet

A foamed sheet, a manufacturing method technology, applied in chemical instruments and methods, diffusing elements, instruments, etc., can solve the problems of poor thermoformability, wrinkles, and reflective plates entering cracks, etc., to achieve the effect of improving light reflection performance

Inactive Publication Date: 2008-04-02
SEKISUI PLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, since the reflector is stretched as described above, its thermoformability is poor.
[0006] Therefore, in order to process the reflector into a shape corresponding to the arrangement state of the cold cathode tubes, it is necessary to slit and bend the reflector, and the workability is poor, and there are cracks entering the reflector during the bending process. or wrinkles

Method used

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  • Foamed sheet for reflectors, reflectors, and process for production of the sheet
  • Foamed sheet for reflectors, reflectors, and process for production of the sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7、 comparative example 1～3

[0100] A tandem type extruder with a diameter of 90mm is prepared by connecting a second-stage single-screw extruder (diameter: 115mm) to the front end of the first-stage single-screw extruder (diameter: 90mm) Single-screw extruder, the former extruder is used as the first extruder, and the latter extruder is used as the second extruder. On the other hand, a confluence die head and the confluence die head connected The co-extrusion die head composed of a ring die head is prepared by connecting the first-stage extruder and the second extruder of the first extruder to the confluence die head of the co-extrusion die head Manufacturing device.

[0101] Next, in the first-stage extruder of the first extruder, a predetermined amount of polypropylene resin (trade name "PF814" manufactured by Sangoroma Company) as shown in Table 1 was sequentially supplied with refractive index : 1.5). A masterbatch containing rutile titanium dioxide (masterbatch) (manufactured by Dainichi Seiki Co., Ltd....

Embodiment 8、9

[0110] The manufacturing apparatus used in Example 1 was prepared. Next, in the first-stage extruder of the first extruder, polypropylene resin (trade name "PF814" manufactured by Sangoroma Co., Ltd.) was sequentially supplied in accordance with the prescribed amount shown in Table 1. : 1.5). A masterbatch containing rutile-type titanium dioxide in a polypropylene resin (trade name "PL500A" manufactured by Sanya Roman Co., Ltd., refractive index: 1.5) (trade name manufactured by Toyo Ink Manufacturing Co., Ltd.) "PPM 1KB 622WHT FD", titanium dioxide (refractive index: 2.76): 70% by weight, polypropylene resin: 30% by weight), and a masterbatch containing a mixture of sodium bicarbonate and citric acid in the resin (Colleriant ( Clarion Corporation’s product name "Hydroxylu (Hydrosol) HK-70", a mixture of sodium bicarbonate and citric acid 70% by weight), melted and kneaded at 200°C to form a foamable polypropylene resin combination Things. In addition, the blending ratios of the p...

Embodiment 10、11

[0118] Prepare the tandem extruder used in Example 1 and a single-screw extruder with a diameter of 90 mm for the second machine. The former extruder is used as the first extruder and the latter extruder is used as the second extruder. The extruder and the third extruder, on the other hand, prepare a co-extrusion die consisting of a confluence die and an annular die connected to the confluence die, and prepare the first stage of the first extruder A manufacturing device formed by connecting an extruder, a second extruder, and a third extruder to the confluence die of the co-extrusion die.

[0119] Next, in the first-stage extruder of the first extruder, polypropylene resin (trade name "PF814" manufactured by Sangoroma Co., Ltd.) was sequentially supplied in accordance with the prescribed amount shown in Table 1. : 1.5). A masterbatch containing rutile titanium dioxide (trade name "SSC-04B384" manufactured by Dainichi Seika Co., Ltd.) in a polypropylene resin (trade name "PL500A" m...

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Abstract

A foamed sheet for reflectors which can be thermoformed into reflectors having desired shapes. A foamed sheet (A) for reflectors, characterized by being constituted of a foamed sheet (1) of a polypropylene resin which has a mean cell diameter of 50 to 650[mu]m and at least one uneven surface (12) formed by cells (11) present in the neighborhood of the surface and a non-foamed sheet (3) of the polypropylene resin which is united with the sheet (1) by lamination in such a way that the sheet (3) lies on the sheet (1) along the uneven surface (12) to form an uneven surface (31), by containing an inorganic filler (2) in an amount of 50 to 200g / m<2>, the whole or part of which filler is contained in the sheet (1), and by having a difference in refractive index of 1.0 or above between the inorganic filler (2) and the polypropylene resin, a thickness of the sheet (A) of 0.2 to 2.0mm, and a light reflectance of 97% or above.

Description

Technical field [0001] The invention relates to a method for manufacturing a foamed sheet for a reflecting plate, a reflecting plate and a foamed sheet for the reflecting plate. Background technique [0002] In recent years, liquid crystal display devices have been widely spread. The liquid crystal display device irradiates light to the liquid crystal cell from a light source arranged behind or on the side of the liquid crystal cell. Then, in order to increase the amount of light irradiated from the light source to the liquid crystal cell, a reflective plate is arranged behind the light source. [0003] In addition, the size of the liquid crystal display device is rapidly developing. In order to obtain good brightness on the entire surface of the liquid crystal display screen, the reflector must be shaped to correspond to the cold cathode tube. Especially in the backlight type liquid crystal display device, the liquid crystal Multiple cold cathode tubes are sprayed at the rear of...

Claims

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Application Information

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IPC IPC(8): G02B5/08B32B5/18B32B27/32C08J9/04G02B5/02G02F1/1335
Inventor 吉田贤一新堂雅浩人见一迅樽本裕之
Owner SEKISUI PLASTICS CO LTD
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