JP2019218637A - High reflection water-disintegrable paper - Google Patents

Abstract

To provide a high reflection water-disintegrable paper having high reflectance and water-disintegration property, especially to provide a high reflection water-disintegrable paper which can be used in a measurement from the sky using a drone, etc.SOLUTION: The high reflection water-disintegrable paper has a reflectance of 85% or over in a wavelength of 500 nm or over to 1000 nm or under and a floc water dispersion time of 60 s or over to 600 s or under.SELECTED DRAWING: None

Description

  The present invention relates to a high-reflection water disintegration paper.

  Records of land rights are maintained at the registry office, but maps and drawings provided at the registry office are based on maps made during the Meiji era when the land tax was revised. For this reason, the maps and drawings provided at the registry office often have boundaries and shapes different from reality, and the area of land described in the registry may not be accurate.

  If accurate information is not recorded about land boundaries, areas, owners, etc., there will be problems such as disputes over boundaries, inability to calculate accurate property tax amounts, and hindrance to restoration work in the event of a disaster. . For this reason, municipalities survey land owners, lot numbers, and land patterns on a stroke-by-stroke basis, and furthermore, cadastral surveys are conducted to measure the location and area of land boundaries. The cadastral survey covers all lands. However, in mountainous areas, it is difficult to reach the destination, and the slope is steep. Therefore, surveying is more difficult than in urban areas. For this reason, it is required to conduct a cadastral survey in mountainous areas efficiently, and utilization of satellite photography, aerial images, drones, and the like has been proposed.

  An object of the present invention is to provide a high-reflection water disintegration paper having a high reflectance and water dissolvability, and in particular, to provide a high reflection water-disintegration paper that can be used for surveying from above using a drone or the like.

Means for solving the problems of the present invention are as follows.
1. A reflectance of 85% or more at a wavelength of 500 nm or more and 1000 nm or less,
Flock-like water dispersion time is 60 seconds or more and 600 seconds or less,
A high-reflection water disintegration paper characterized in that:
2. The basis weight is 55 g / m ² or more and 200 g / m ² or less. High-reflection water disintegration paper described in 1.
3. 1. It comprises papermaking fibers and a white filler, and contains at least 40% by mass of the white filler with respect to the total mass. Or 2. High-reflection water disintegration paper described in 1.
4. The white filler contains calcium carbonate. ~ 3. Highly reflective water disintegrated paper according to any of the above

  Since the high-reflection water disintegration paper of the present invention has a high reflectance, it can be identified from the sky of 150 m or less. The high-reflection water-disintegrated paper of the present invention is water-disintegrable and disintegrates over time, so that it is not necessary to collect it. The high-reflection water disintegration paper of the present invention can be suitably used particularly for surveying in mountainous areas.

  The high reflection water disintegrated paper of the present invention is characterized in that the reflectance at a wavelength of 500 nm or more and 1000 nm or less is 85% or more, and the floc-like water dispersion time is 60 seconds or more and 600 seconds or less.

  The use of the high-reflection water disintegration paper of the present invention is not particularly limited. For example, there is a survey from the sky using a drone or the like. In surveying from the sky, place the high-reflection water disintegration paper of the present invention in a reference location, or surround the land to be surveyed with the high-reflection water disintegration paper of the present invention, and use a drone or the like in the sky to detect the position of the high-reflection hydrolytic paper. By identifying the position, shape, pattern, and the like of the high-reflection water disintegration paper by scanning or the like, it is possible to efficiently perform surveying.

  The high reflection water disintegrated paper of the present invention has a reflectance of 85% or more at a wavelength of 500 nm or more and 1000 nm or less. In Japan, the flying height of the drone is limited to 150 m or less. If the reflectance is 85% or more, the highly reflective water-disintegrated paper of the present invention placed on the ground is identified from the height of 150 m or less. can do. The higher the reflectance is, the more the discrimination is improved. For example, even when natural light such as cloudy weather is insufficient, more accurate surveying is possible. Therefore, the reflectance is more preferably 86% or more, and more preferably 88% or more. More preferably, it is most preferably 90% or more. The reflectance at a wavelength of 500 nm or more and 1000 nm or less is measured at a sampling pitch of 1 nm in a wavelength range of 500 nm or more and 1000 nm or less using a spectrophotometer, and the obtained value is based on the reflectance of a barium sulfate white plate (100%). )).

  The high reflection water disintegration paper of the present invention has a floc-like water dispersion time of 60 seconds or more and 600 seconds or less, and has an appropriate water disintegration property. In addition, the floc-like water dispersion time is a time in which 300 ml of deionized water is put into a 300 ml beaker, a 3 cm square test piece is thrown in while stirring at 650 rpm with a stirrer, and the test piece is cut into two or more pieces. The floc-like water dispersion time is preferably from 70 seconds to 450 seconds, more preferably from 80 seconds to 300 seconds, and most preferably from 90 seconds to 200 seconds.

  The high-reflection water disintegration paper of the present invention can maintain its shape for several days when placed on the ground because the floc-like water dispersion time is 60 seconds or more. Therefore, the high-reflection hydrolytic paper of the present invention can be used for surveying even in a place where it takes a long time to install the high-reflection hydrolytic paper, such as a steep slope in a mountain area, or in a wet place such as a wetland. The shape can be maintained until completed. In addition, the high reflection water disintegrated paper of the present invention disintegrates in a short time due to rainwater or the like in a natural environment since the floc-like water dispersion time is 600 seconds or less. Therefore, the high-reflection water disintegrated paper of the present invention does not need to be collected after the completion of the survey, and can eliminate the risk of an accident caused by the collection work particularly in a place where entry is difficult.

  The high-reflection water disintegrating paper of the present invention is not particularly limited as long as it satisfies the above-mentioned reflectance and floc-like water dispersion time, but includes papermaking fibers and a white filler, and has a white filler of 40% by mass based on the total mass. %.

<Fiber for papermaking>
The papermaking fibers used in the present invention are not particularly limited, and include wood pulp such as softwood pulp and hardwood pulp, bast fiber such as flax, kenaf, mulberry, and mitsumata, hard fiber such as bagasse, bamboo, and espart, and cotton linter. Non-wood pulp such as seed wool fiber, leaf vein fiber such as Manila hemp, sisal hemp, biodegradable synthetic fiber (rayon fiber, purified cellulose fiber, polylactic acid fiber, polyvinyl alcohol fiber, biodegradable polyester fiber, etc.) Can be used. As the pulp, chemical pulp, ground pulp, chemical ground pulp, thermomechanical pulp or the like by kraft cooking, acid / neutral / alkaline sulfite cooking, soda salt cooking, or the like can be used.

The papermaking fibers are used after being dispersed in water or after beating. If the beating is advanced, the bonding between fibers increases, and the water dispersibility of the obtained base material becomes poor. If the degree of beating is too high, the water disintegration (water dispersibility) of the base material becomes insufficient, and the degree of beating Is too low, the strength may decrease. The water disintegration can be adjusted by the presence or absence and the degree of the beating treatment with the additives to the base material.
The degree of beating of papermaking fibers can be increased when the water dispersibility is improved by additives such as powder, since the degree of beating can be increased. Therefore, the shopper rigler filtration water specified in JIS P8121-1: 2012 can be used. It is preferable that the temperature be adjusted to be 17 ° SR or more and 72 ° SR or less.

  By mixing water-insoluble or hardly water-soluble powders into papermaking fiber raw materials, contact between fibers is inhibited and the bonding state between fibers becomes unstable. It is easy to disperse in water, and the water dissolvability of the base material can be enhanced. Further, by adding these powders, the reflectance can be increased.

  As the water-insoluble powder, a nonmetallic inorganic substance, a metal, a water-insoluble inorganic salt, or the like is used. As the poorly water-soluble powder, a poorly water-soluble inorganic salt is used. It is preferable to add these powders internally so as to obtain the reflectance of the present invention.

  Specific examples of the water-insoluble powder are as follows, and may be used alone or in combination of two or more, including a poorly water-soluble powder. Metal oxides such as aluminum oxide and titanium dioxide. Carbides such as silicon carbide and boron carbide. Nitrides such as silicon tetranitride and boron nitride; Silicate minerals such as mica, feldspars, silica minerals, clay minerals, synthetic zeolites and natural zeolites. Titanate compounds such as potassium titanate and barium titanate; Silicate compounds such as magnesium silicate. Phosphate compounds such as zinc phosphate.

  Specific examples of the water-insoluble powder are as follows, and may be used alone or in combination of two or more, including the water-insoluble powder. Metal hydroxides such as aluminum hydroxide and magnesium hydroxide. Carbonate compounds such as calcium carbonate, barium carbonate, magnesium carbonate and zinc carbonate. Sulfate compounds such as barium sulfate, calcium sulfate and strontium sulfate.

<White filler>
The white filler used in the present invention is not particularly limited, and white fillers generally used for papermaking, such as calcium carbonate, titanium dioxide, kaolin, clay, talc, and white carbon, can be used. Among these, calcium carbonate is preferred from the viewpoints of reflectivity (whiteness), cost, and disintegration in the environment.
Calcium carbonate is added in the form of particles and can be appropriately selected from the viewpoints of cost and ease of papermaking, but preferably has a weighted average particle diameter of 0.02 μm or more and 10 μm or less.

  The amount of the white filler is preferably at least 40% by mass based on the total mass of the high-reflection hydrolyzed paper. The amount of the white filler is more preferably at least 42% by mass, and even more preferably at least 45% by mass. If the amount of the white filler is less than 40% by mass based on the total mass of the high-reflection hydrolyzed paper, it is difficult to achieve the reflectance of the present invention. The upper limit of the amount of the white filler is not particularly limited. However, when the amount of the white filler is large, the strength of the paper is reduced and the paper is easily broken, so that the amount is usually about 65% by mass or less.

<Papermaking>
As the paper machine for producing the high-reflection water-disintegrated paper, any of a long net type paper machine, a round net type paper machine, a short net type paper machine, a twin wire type paper machine and the like can be used. Papermaking is carried out by either neutral papermaking or alkaline papermaking. In addition, if necessary, a papermaking internal additive such as a sulfate band, various anionic, cationic, nonionic, or amphoteric retention improvers, drainage improvers, and paper strength enhancers is added. can do. Further, if necessary, papermaking additives such as a pH adjuster, an antifoaming agent, a pitch control agent, and a slime control agent can be added.

The basis weight of the high-reflection water-disintegrated paper is preferably 55 g / m ² or more and 200 g / m ² or less. If the basis weight is less than 55 g / m ² , it will be difficult to achieve the reflectance of the present invention. If the grammage exceeds 200 g / m ² , the paper becomes thick and heavy, which is not preferable because the burden of the surveying work in the mountainous area increases.

  The high reflection water disintegration paper is JAPAN TAPPI No. The dry tensile strength in the longitudinal direction measured according to No. 71 is preferably 10 N / 15 mm or more. If the tensile strength in the longitudinal direction is less than the above-mentioned value, the paper is apt to be torn, and it is difficult to handle it during a surveying operation or the like.

Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited to only the following examples.
(Example 1)
Wood pulp (softwood pulp: 74% by mass, hardwood pulp: 26% by mass) was beaten to a freeness of 70 ° SR, and calcium carbonate (PCX-850, manufactured by Shiroishi Kogyo Co., Ltd.) was used in an amount of 80% based on the total mass of the wood pulp. A raw material slurry was prepared by adding 〜100% by mass.
The raw material slurry was paper-made with a fourdrinier paper machine to obtain a base paper having a basis weight of 104.7 g / m ² , an ash content of 51.3%, and a calcium carbonate content of 53.7 g / m ² .

(Example 2)
Wood pulp (softwood pulp: 74% by mass, hardwood pulp: 26% by mass) was beaten to a freeness of 70 ° SR, and calcium carbonate (PCX-850, manufactured by Shiroishi Kogyo Co., Ltd.) was added to the wood pulp at 60%. A raw material slurry was prepared by adding 〜80% by mass.
The raw material slurry was paper-made with a fourdrinier paper machine to obtain a base paper having a basis weight of 104.6 g / m ² , an ash content of 40.8%, and a calcium carbonate content of 42.7 g / m ² .

(Example 3)
Wood pulp (softwood pulp: 74% by mass, hardwood pulp: 26% by mass) was beaten to a freeness of 70 ° SR, and calcium carbonate (PCX-850 manufactured by Shiroishi Kogyo Co., Ltd.) was added to the total mass of the wood pulp at 100%. A raw material slurry was prepared by adding about 120% by mass.
This raw material slurry was paper-made with a fourdrinier paper machine to obtain a base paper having a basis weight of 104.7 g / m ² , an ash content of 60.5%, and a calcium carbonate content of 63.3 g / m ² .

(Example 4)
Wood pulp (softwood pulp: 74% by mass, hardwood pulp: 26% by mass) was beaten to a freeness of 70 ° SR, and calcium carbonate (PCX-850, manufactured by Shiroishi Kogyo Co., Ltd.) was used in an amount of 80% based on the total mass of the wood pulp. A raw material slurry was prepared by adding 〜100% by mass.
The raw material slurry was paper-made with a fourdrinier paper machine to obtain a base paper having a basis weight of 59.4 g / m ² , an ash content of 40.2%, and a calcium carbonate content of 23.9 g / m ² .

(Comparative Example 1)
Wood pulp (softwood pulp: 74% by mass, hardwood pulp: 26% by mass) was beaten to a freeness of 70 ° SR, and calcium carbonate (PCX-850, manufactured by Shiroishi Kogyo Co., Ltd.) was added to the wood pulp at 10%.原料 20% by mass was added to prepare a raw material slurry.
The raw material slurry was paper-made with a fourdrinier paper machine to obtain a base paper having a basis weight of 103.9 g / m ² , an ash content of 9.4%, and a calcium carbonate content of 9.8 g / m ² .

(Comparative Example 2)
Wood pulp (softwood pulp: 74% by mass, hardwood pulp: 26% by mass) was beaten to a freeness of 70 ° SR, and calcium carbonate (PCX-850 manufactured by Shiroishi Kogyo Co., Ltd.) was added to 160% of the total mass of the wood pulp. -180 mass% was added to prepare a raw material slurry.
The raw material slurry was paper-made with a fourdrinier paper machine to obtain a base paper having a basis weight of 104.2 g / m ² , an ash content of 69.2%, and a calcium carbonate content of 72.1 g / m ² .

(Comparative Example 3)
Wood pulp (softwood pulp: 74% by mass, hardwood pulp: 26% by mass) is beaten to a freeness of 70 ° SR, and calcium carbonate (PCX-850, manufactured by Shiroishi Kogyo Co., Ltd.) is added to the wood pulp at 60%. A raw material slurry was prepared by adding 〜80% by mass.
This raw material slurry was paper-made with a fourdrinier paper machine to obtain a base paper having a basis weight of 59.7 g / m ² , an ash content of 30.3%, and a calcium carbonate content of 18.1 g / m ² .

The following measurements were performed for each of the obtained base papers. Table 1 shows the results.
-Basis weight and thickness The basis weight was measured according to JIS P8124, and the thickness was measured according to JIS P8118.
・ Ash (525 ° C)
Ash content was measured in accordance with JIS P8252 except that the combustion temperature was 525 ° C. This is because calcium carbonate as a white filler is decomposed into calcium oxide and carbon dioxide at the combustion temperature (900 ° C.) specified in JIS P8252.
-Calcium carbonate content The calcium carbonate content was determined from the product of the basis weight and the ash content.

-Reflectance Using a spectrophotometer (solidspec-3700DUV, Shimadzu Corporation), the reflectance was measured at a sampling pitch of 1 nm in a wavelength range of 500 nm or more and 1000 nm or less, and the average value was taken with the reflectance of the barium sulfate white plate as a reference (100%). I asked.

-Floc-like water dispersion time Five test pieces of 3 cm square were prepared. Next, 300 ml of deionized water was placed in a 300 ml beaker, and one of the test pieces was charged while stirring at 650 rpm with a stirrer. The time at which the test piece was cut into two or more pieces was measured with a stopwatch, and the average value of the five measurements was taken as the floc-like water dispersion time.
-Tensile strength Tensile strength is measured by JAPAN TAPPI NO. 71.

An 8 cm × 1 m sample was cut out from the base paper produced above.
Water was sprayed on the lawn of Mt. Fuji Sky Ground (Fujinomiya City, Shizuoka Prefecture), the sample was fixed on the wet lawn, and a laser was scanned from above 150 m with a survey drone. Then, water was sprinkled on the sample, and the water disintegration was investigated.
The base papers manufactured in Examples 1 to 4 had a high reflectance of 85% or more, and could be identified from 150 m above the sky. Further, the base papers manufactured in Examples 1 to 4 had a floc-like water dispersion time within a predetermined range, and were disintegrated when water was applied.

The base papers manufactured in Comparative Examples 1 and 3 had low reflectance, and could not be identified from 150 m above the sky. In addition, the base paper manufactured in Comparative Example 1 had a long floc-like water dispersion time, and did not fall apart even with water.
The base paper manufactured in Comparative Example 2 could be identified from 150 m above the sky. However, the floc-like water dispersion time was short, and tearing occurred only by fixing on wet grass.

Claims (4)

A reflectance of 85% or more at a wavelength of 500 nm or more and 1000 nm or less,
Flock-like water dispersion time is 60 seconds or more and 600 seconds or less,
A high-reflection water disintegration paper characterized in that: Highly reflective water-decomposable paper according to claim 1, characterized in that less than a basis weight of 55 g / ^{m 2} or more 200 g / ^{m 2.}   The high-reflection hydrolyzed paper according to claim 1 or 2, comprising papermaking fibers and a white filler, wherein the white filler is contained in an amount of 40% by mass or more based on the total mass.   The high reflection water disintegrated paper according to any one of claims 1 to 3, wherein the white filler contains calcium carbonate.