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

A technology of foam sheet and manufacturing method, which is applied in the direction of diffusion elements, optics, instruments, etc., can solve problems such as poor thermoformability, wrinkles, and reflection plate entering cracks, etc., and achieve the effect of improving light reflection performance

Inactive Publication Date: 2009-09-23
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
  • 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 (tandem) type extruder with a diameter of 90mm is prepared by connecting the second-stage single-screw extruder (caliber: 115mm) to the front end of the first-stage single-screw extruder (caliber: 90mm) The single-screw extruder, the extruder of the former is used as the first extruder, and the extruder of the latter is used as the second extruder. On the other hand, the confluence die and the confluence die connected A co-extrusion die composed of an annular die is prepared by connecting the first-stage extruder and the second extruder of the first extruder to the confluence die of the co-extrusion die manufacturing device.

[0101] Next, to the first-stage extruder of the first extruder, a predetermined amount of polypropylene-based resin (San Aroma (San Aroma) Co., Ltd. product name "PF814") shown in Table 1 was sequentially supplied, and the refraction Ratio: 1.5), a masterbatch (masterbatch, Masterbatch) containing rutile-type titanium dioxide in polyprop...

Embodiment 8、9

[0110] The production apparatus used in Example 1 was prepared. Next, to the first-stage extruder among the first extruders, a polypropylene-based resin (trade name "PF814" manufactured by Sanya Roman (San Aroma) Co., Ltd. Ratio: 1.5), a masterbatch (manufactured by Toyo Ink Liquid (Inki) Manufacturing Co. Trade name "PPM1KB 622 WHT FD", titanium dioxide (refractive index: 2.76): 70% by weight, polypropylene-based resin: 30% by weight) and a masterbatch (Kolerian Special (Clariant) company product name "Hydrocerol HK-70", a mixture of sodium bicarbonate and citric acid: 70% by weight), melted and kneaded at 200 ° C to become foamed polypropylene A resin composition. In addition, the compounding ratio of the mixture of the polypropylene resin, titanium dioxide, sodium bicarbonate, and citric acid supplied to the 1st extruder is shown in Table 2, for example.

[0111] Next, the expandable polypropylene-based resin composition was continuously supplied to the second-stage extr...

Embodiment 10、11

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

[0119] Next, to the first-stage extruder among the first extruders, a polypropylene-based resin (trade name "PF814" manufactured by Sanya Roman (San Aroma) Co., Ltd. Ratio: 1.5), a masterbatch (trade name "SSC" manufactured by Dainichi Seika Co., Ltd.) containing rutile-type titanium dioxide in polypropylene-based resin (trade name "PL500A" manuf...

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Abstract

The present invention provides a foam sheet for reflective plates that can be formed into a reflective plate having a desired shape by thermoforming. The foam sheet (A) for reflectors of the present invention is characterized by comprising: a polypropylene-based sheet having an average cell diameter of 50 to 650 μm and at least one side of which is formed as a concave-convex surface (12) by cells (11) located near the surface. A resin foam sheet (1), and a polypropylene-based resin foam sheet (1) which is laminated and integrated in a state along the concave-convex surface (12) and whose surface is formed as a concave-convex surface (31) A resin non-foamed sheet (3), which contains an inorganic filler at a rate of 50 to 200 g / m2 in the foamed sheet for reflecting plates (A), and contains an inorganic filler in the polypropylene-based resin foamed sheet (1). All or a part of the filler, while the difference between the refractive index of the inorganic filler (2) and the refractive index of the polypropylene resin is 1.0 or more, the overall thickness of the foamed sheet (A) for a reflective plate is 0.2 to 2.0 mm and the light reflection The rate is above 97%.

Description

technical field [0001] The invention relates to a foamed sheet for reflective plates, a reflective plate and a method for manufacturing the foamed sheet for reflective plates. Background technique [0002] In recent years, a liquid crystal display device that irradiates light to a liquid crystal cell from a light source disposed behind or on a side of the liquid crystal cell has been widely used. Then, in order to increase the amount of light irradiated from the light source to the liquid crystal cell, a reflector is arranged behind the light source. [0003] In addition, the size of liquid crystal display devices is rapidly increasing. In order to obtain good brightness on the entire surface of the liquid crystal display screen, it is necessary to make the reflector a shape corresponding to the cold cathode tube. Multiple cold-cathode tubes are sprayed on the rear of the unit, and reflectors must be processed into complex shapes in order to correspond to the arrangement of...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
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
OwnerSEKISUI PLASTICS CO LTD