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Light-shielding sheet

A technology for shading paper and base paper, which is applied in the field of shading paper, can solve the problems of residue, toxic gas, difficult metal parts or color film parts, such as separation and recycling, and achieves the effect of good shading characteristics, printing characteristics and easy handling.

Inactive Publication Date: 2010-10-27
HOKUETSU PAPER MILLS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, these conventional packages have a problem in handling that it is difficult to separate the metal part or the colored film part used as a light-shielding layer and recycle through sieving
In addition, when packaging using metal as a light-shielding layer (Japanese Utility Model Registration No. 3015297, Japanese Utility Model Unexamined Patent-No. 62-43356) is incinerated as waste, problems such as generating a large amount of incineration ash, or Metal components remain after incineration and damage the incinerator or reduce incineration efficiency
In addition, when incinerating packages that use colored films as light-shielding layers, problems arise such as generation of toxic gases
In addition, when these light-shielding packages are disposed of by digging and landfilling or ashes generated by incineration of light-shielding packages, metal components or color film components cannot be naturally decomposed, which causes problems such as adverse effects on the global environment

Method used

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Examples

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Embodiment

[0088] Preferred embodiments of the present invention will be described below. However, the present invention is not limited to these Examples. Regarding the shading rate of each shading paper, light having a wavelength of 200 to 800 nm was measured using a spectrophotometer (UV-3100S produced by Shimadzu Corporation) under the condition of using a halogen lamp, a deuterium lamp, and an integrating sphere. The light transmittance, and the slit width and measurement speed are set to 20nm and medium speed, respectively. Regarding the brightness and chromaticity of the shading paper, in the case of environmental settings (ultraviolet environment UV-IN (including ultraviolet light), SCI (including luminescence), LAV diameter: 25.4mm, light source: JIS-C light source, viewing angle: 2°) The luminance value V and the chromaticity value C in the Munsell color system were determined by the stimulus specification and chromaticity coordinates of the substrate measured using a Macbeth s...

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Abstract

[PROBLEMS] A light-shielding sheet ensuring sufficient light-shielding performance without using a metal sheet of aluminum or the like, a sheet sprayed with metal powder, or a colored resin film producing a toxic gas or detrimental residues during incineration. [MEANS FOR SOLVING PLOBLEMS] The light-shielding sheet is employed entirely or partially as a package for containing a photosensitive substance and characterized in that the transmissivity to light having a wavelength in the range of 200-800 nm is not higher than 6% by forming a white coating layer on both sides of a base sheet principally comprising pulp.

Description

technical field [0001] The present invention relates to light-shielding paper. More specifically, the present invention relates to light-shielding paper suitable for packaging light-sensitive substances such as food, pharmaceuticals, paper, tape, or film. Background technique [0002] In general, a wide variety of light-shielding papers suitable for packaging light-sensitive substances are already known. Such as the utility model whose Japanese registration number is 3015297 (see claim 1, figure 2 ) discloses packaging using metal sheets such as aluminum as a light shielding layer. Utility model of Japanese Unexamined No. 62-43356 (see claim 1, Figure 1 to Figure 1 0) discloses a package having a base body sprayed with metal powder such as aluminum. Utility model of Japanese Unexamined No. 7-11554 (see claim 1, figure 2 ) discloses a kind of packaging that uses colored film as light-shielding paper. [0003] However, these conventional packages have a problem in handl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/28D21H19/84B65D65/16D21H19/82D21H21/14D21H27/10
CPCD21H21/14D21H19/82D21H21/28D21H27/10D21H19/84
Inventor 中村达也田中健司
Owner HOKUETSU PAPER MILLS
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