JP2006051976A - Acid-free paper tube for data storage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an acid-free paper tube for data storage capable of storing valuable materials such as an old map, a dyed and woven item, a scroll and a roll under stable conditions for a long time while preventing their discoloration or deterioration. <P>SOLUTION: Acid-free paper (11) wherein a cold water extraction pH value is in a range of 6.5-10.0, a content of completely inorganic anions per a dried mass of 1 kg is 300 mg or less, and a content of sulfate ions in the completely inorganic anion content is 70 mg or less is formed into a tubular shape. The tube (1) thus formed is equipped with a lid including inside a layer (31) with humidity conditioning ability and pollutant gas adsorbing ability at both ends. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is a long-term use of precious ancient maps, dyed and woven articles, scrolls, scrolls, etc., and works such as newly born artworks (hereinafter collectively referred to as “documents”). The present invention relates to a neutral paper tube for storing materials used for storing in a stable state. More specifically, even if it is used in contact with the material for a long period of time, the pollutant gas in the air and the acidic substances generated from the material are removed without adversely affecting the material, and the material is discolored, broken, cracked, wavy, etc. The present invention relates to a neutral paper tube for storing materials, which can prevent deterioration, deterioration, etc. of materials and can effectively store materials for long periods.

  In recent years, fine arts and textiles stored in art museums and museums have been used to oxidize pollutants such as ammonia, formalin and acetic acid generated from interior materials of buildings, as well as sulfur oxides and nitrogen oxides emitted from automobiles and factories. It is regarded as a problem that it is altered and deteriorated by air pollutants such as things.

  In addition, when materials are stored for a long period of time, countermeasures against deterioration due to acidic substances caused by deterioration of the materials themselves are urgently required.

For this reason, the present inventors have made the following proposals in Patent Documents 1 to 5 regarding neutral paper and processed products thereof for use in the field of preservation and restoration of materials as described above.
That is, in Patent Document 1, by using a protective / preservation paper made of neutral paper having a cold water extraction pH value within a certain range and a total inorganic anion content of a certain amount or less, good preservation properties of the material, It was proposed that safety could be achieved. Further, by applying such neutral paper, Patent Document 2 uses a shaft and frame printing paper, Patent Document 3 uses a frame matboard, Patent Document 4 uses a document storage envelope, and Patent Document 5 shows. Proposed a neutral cardboard for storing materials.

Moreover, the present inventors made the following proposals in Patent Document 6 to Patent Document 9 regarding paper having humidity control and contamination gas adsorption.
That is, in Patent Document 6, an article storage paper using a non-crystalline inorganic powder having moisture absorption / desorption ability and a shell fossil powder having gas adsorption ability is used, and in Patent Document 7, water-insoluble phosphoric acid of silicon dioxide and tetravalent metal is used. A sheet-shaped adsorbent containing a salt and a hydroxide of a divalent metal, a low-density moisture-control paper using moisture-absorbing / releasing powder and foaming microcapsules in Patent Document 8, and a moisture-absorbing / releasing property in Patent Document 9 We proposed a humidity-controlled paper that uses powder and heat-fusible substance to reduce moisture absorption / release powder.

On the other hand, materials storage facilities, material restoration workshops, and large-scale production workshops, etc., are safe for storing and transporting wide and long materials that exceed a certain size that cannot fit in a storage shelf or storage case. It is difficult to handle due to lack of appropriate containers. Similarly, a safe and appropriate material is also required for a small-diameter paper tube used as a winding core for a shaft or fabric. Therefore, unwillingly store the rolled material directly in a paper tube made of existing acidic paper, or wind the outside of the material with neutral paper so that the material and the acidic paper tube do not touch each other directly. The actual situation is used.
However, even if the outside of the material is wrapped with neutral paper and the material and the acidic paper tube are not in direct contact, the acidic substance generated from the acidic paper used as the paper tube penetrates the cover of the neutral paper, Problems such as damaging the materials stored in it are not solved, and a fundamental solution is desired.

JP 2002-194695 A JP 2003-119698 A JP 2003-171895 A JP 2003-171896 A JP 2003-171899 A Japanese Patent No. 1823632 Japanese Patent Laid-Open No. 06-335614 Japanese Patent No. 3176539 Japanese Patent Laid-Open No. 10-212692

An object of the present invention is to solve the above-described problems, and specifically, to provide a paper tube having the following conditions.
(1) Prevent the generation of acidic substances from the paper tube by using neutral paper that does not contain acidic substances or uses as little as possible.
(2) Have humidity conditioning and pollutant gas adsorption performance.
(3) It must be light and moderately strong, and can easily cut the paper tube with a cutter or the like according to the size of the material.
(4) Use adhesives that do not cause chemical or biological damage to the material.
(5) It is inexpensive and has excellent protection and storage stability.
(6) Disposal is easy.

  That is, the invention according to claim 1 of the present invention has a cold water extraction pH value in the range of 6.5 to 10.0, a total inorganic anion content of 300 mg or less per 1 kg of the mass after drying, and the total inorganic Provided with lids on both sides of the cylindrical body of neutral paper whose sulfate ion content in the anion content is 70 mg or less and processed into a cylindrical shape, with layers having moisture conditioning and contaminant gas adsorption This is a neutral paper tube for preserving materials.

  The invention according to claim 2 of the present invention is the neutral paper tube for storing materials according to claim 1, wherein the neutral paper constituting the cylindrical body has a cold water extraction pH value in the range of 6.5 to 8.5. It is characterized by having a double structure of an inner side made of neutral paper and an outer side made of neutral paper having a cold water extraction pH value in the range of 6.5 to 10.0.

The invention according to claim 3 of the present invention is the neutral paper tube for preserving data of claim 2, wherein the inner neutral paper having a cold water extraction pH value in the range of 6.5 to 8.5 is made of cotton fibers. It is characterized by containing 0.02 to 5 parts by mass of calcium carbonate with respect to 100 parts by mass of papermaking fibers mixed at 30% by mass or more and having a density of 0.4 to 0.6 g / cm ^3. Is.

  The invention according to claim 4 of the present invention is the neutral paper tube for preserving data according to any one of claims 1 to 3, wherein a moisture-proof and / or gas barrier property is provided on the outermost part of the cylindrical body. The base material which has this was further provided.

  The invention according to claim 5 of the present invention is the neutral paper tube for preserving data according to any one of claims 1 to 4, wherein if necessary, a plurality of layers of the neutral paper are further provided with moisture resistance and / or gas. The substrate having barrier properties is bonded with an adhesive while being spirally wound.

  The invention according to claim 6 of the present invention is characterized in that, in the neutral paper tube for document storage according to claim 5, polyvinyl alcohol or an adhesive mainly composed of polyvinyl alcohol is used as the adhesive. It is.

  According to the neutral paper tube for storing data of the present invention (hereinafter abbreviated as “neutral paper tube”), even if the material is stored for a long time in contact with the paper tube, acidic substances are generated from the paper tube. Therefore, it does not adversely affect the material, it can effectively remove moisture and polluted gas flowing in from the outside, and acidic substances generated due to deterioration of the material, and it can also prevent the material from being broken or wavy. It is possible to provide a neutral paper tube that can be used in a safe and appropriate manner when storing and transporting wide and long materials of a certain size or larger that cannot be accommodated in a storage shelf or storage case.

The first to third embodiments will be described below with reference to FIGS. 1 to 4 as neutral paper tubes of the best mode according to the present invention.
1 and 4 show a first embodiment of a neutral paper tube according to the present invention, in which a neutral paper 11 having a cold water extraction pH value in a range of 6.5 to 10.0 is spirally wound. However, it is a neutral paper tube in which lids 3 (FIG. 4) are provided at both ends of a cylindrical body 1 (FIG. 1) formed by bonding with an adhesive and forming into a cylindrical shape.
By forming the cylindrical body 1 from the neutral paper 11 in this way, it is possible to prevent the generation of acidic substances from the paper tube.
The cold water extraction pH value in the present invention is a value measured based on JIS P8133 “Testing method for pH of paper, paperboard and pulp-water extract”.

As this neutral paper 11, the total inorganic anion content is 300 mg or less per 1 kg of the dried paper, and the sulfate content in the inorganic anionic content is 1 kg of the dried paper. Use paper that is 70 mg or less. The neutral paper 11 may be a single layer, but preferably has two or more layers in order to provide strength.
The reason why the total inorganic anion content is 300 mg or less per 1 kg of the dried paper is that when the total inorganic anion content exceeds 300 mg, neutral paper discoloration and strength deterioration become significant. This is because an acidic substance is generated and the influence on the material to be stored is increased.
It is also for the same reason that the sulfate ion content is 70 mg or less per 1 kg of the dried paper mass. In particular, sulfate ions are used for neutral paper discoloration, strength deterioration, generation of acidic substances, etc. This is to have a big influence.

The total inorganic anion content in the present invention was measured using an ion chromatography analysis method of inorganic anions using an IonPac AS4A separation column (4 × 250 mm), F ⁻ , Cl ⁻ , NO ₂ ⁻ , Br ⁻ , NO _3. ⁻ , PO ₄ ^{3 −} , the total amount of anions expressed in mg per kg of paper tube mass after drying at 105 ° C. for 2 hours.
The sulfate ion content is SO ₄ ^{2 −} measured in the same manner as described above, expressed in mg per kg of paper tube mass.

  4 is fitted to both ends of the cylindrical body 1 formed into a cylindrical shape having a thickness and length required for the material to be stored. On the inner side, a layer 31 having humidity control and contamination gas adsorption is provided. The main conditions that the layer 31 having humidity control and pollutant gas adsorption should have are: (1) a high moisture absorption / release rate and a large amount of moisture absorption / release, and (2) adsorb many kinds of pollutant gases. The amount of adsorption is large.

  Specifically, as the layer 31 having humidity control and pollutant gas adsorbing property, the amorphous and low crystalline silica gel, alumina gel, silica alumina gel, etc. A small amount of a fixing agent 0.02 to a slurry obtained by mixing 20 to 60 parts by mass of an amorphous inorganic powder having the ability to absorb and dehumidify and 5 to 20 parts by mass of a fossil shell powder having an ability to adsorb a pollutant gas. It is possible to use 0.06 parts by mass and / or 1 to 15 parts by mass of an organic binder to make paper and dry the moisture-adjusted and polluted gas adsorbed paper obtained by drying.

  By sticking the humidity conditioning and pollutant gas adsorbing paper as described above inside the lid 3 provided at both ends of the cylindrical body 1, the humidity in the neutral paper tube can be kept constant, and various pollutant gases can be Since it can be removed by adsorption, it is possible to effectively protect and preserve the material. In addition, the dead space inside the neutral paper tube is extremely small compared to the storage space for the data, so the humidity inside the neutral paper tube and adsorption removal of various pollutant gases can be performed quickly, which is necessary for this purpose. A very small amount of moisture conditioning and pollutant gas adsorption paper is also required. Therefore, the amount of expensive humidity control and pollutant gas adsorbing paper can be kept to the minimum necessary, and an inexpensive neutral paper tube can be provided.

As shown in FIG. 2, the second embodiment of the present invention is a neutral paper having a cold water extraction pH value in the range of 6.5 to 8.5 on the inner part that directly touches the material stored in the paper tube. 12, a neutral paper 11 having a cold water extraction pH value in the range of 6.5 to 10.0 is used for the outer portion thereof, thereby forming a double-structured cylindrical body 1.
As described above, by using the neutral paper 12 having a pH value in the range of 6.5 to 8.5 which is close to neutral in the inner part of the cylindrical body 1 which directly touches the material, various kinds of different pH values can be obtained. Even if the document is used in contact with the inner wall of the paper tube for a long period of time, the discoloration of the document is small, and the acidic substances that are generated as the document deteriorates are less likely to be generated.
However, in order to make the cold water extraction pH value in the range of 6.5 to 8.5 which is close to neutrality, the production conditions are restricted and the cost is also increased. On the other hand, if the cold water extraction pH value is increased, the durability can be increased.
For this reason, the neutral paper 11 in which the cold water extraction pH value is in the range of 6.5 to 10.0 is used for the outer portion.

Papermaking fibers used for the production of the neutral paper that constitutes the neutral paper tube include bleaching chemicals such as softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), and softwood bleached sulfite pulp (NBSP). Pulp and wood fibers such as ECF / TCP pulp that do not use chlorine bleaching, non-wood fibers such as cotton rugs, linters, hemp, flax, bamboo, straw, kenaf, esparto, bagasse, straw, cocoon, husk, etc. Depending on the case, synthetic fibers such as rayon, vinylon, nylon and recycled paper may be used in combination. However, it is desirable to use high-purity virgin pulp with a low content of lignin and hemicellulose, which adversely affects neutral paper discoloration and strength reduction.
In addition, in order to obtain a neutral paper having a cold water extraction pH value in the range of 6.5 to 10.0, a filler such as calcium carbonate, magnesium carbonate, aluminum hydroxide, magnesium hydroxide or the like showing alkalinity is used for papermaking. It is used in the range of 0.02 to 15.0 parts by mass with respect to 100 parts by mass of the fiber.

As in the second embodiment shown in FIG. 2, as the neutral paper 12 having a cold water extraction pH value in the range of 6.5 to 8.5 used for the inner portion of the cylindrical body 1, 30 masses of cotton fibers are used. % Neutral paper having a density of 0.4 to 0.6 g / cm ³ is particularly preferred. it can.

  As shown in FIG. 3, the third embodiment of the present invention is further outside the outer neutral paper 11 having a cold water extraction pH value in the range of 6.5 to 10.0 in the second embodiment (FIG. 2). The cylindrical body 1 is configured by providing a base material 13 having moisture resistance and / or gas barrier properties on the outermost part. As a result, the inside of the neutral paper tube can be sealed to reliably prevent moisture from entering and exiting and inflow of various polluted gases.

  Examples of the substrate having moisture resistance and / or gas barrier property include 15 to 25 μm films such as low density and high density polyethylene and polypropylene, polyethylene laminated paper, various resin-coated papers, EVAL (trade name (Kuraray Co., Ltd.) Composite film) and the like can be used.

  The neutral paper tube according to the present invention has a thickness and a length required for a material to be stored, and it is sufficient that the neutral paper tube has an appropriate strength required for storage and transportation. In other words, it can be molded into a cylindrical body of the necessary thickness and length and can be used without problems as long as it has an appropriate strength, but in order to efficiently produce a neutral paper tube, a plurality of neutral papers are used. If necessary, it is preferable to employ a method in which a substrate having moisture resistance and / or gas barrier properties is bonded with an adhesive while being spirally wound.

In the first embodiment shown in FIG. 1, the cylindrical body 1 is illustrated as being composed of a single layer of neutral paper 11, but this neutral paper 11 is composed of a plurality of neutral papers. It can be set as the cylindrical body bonded helically. In this case, the number of windings varies depending on the inner diameter and length of the target paper tube. For example, the cold water extraction pH value is in the range of 6.5 to 10.0, the basis weight is 80 to 350 g / m ² , and the density. By winding 2 to 12 layers of neutral paper of about 0.4 to 0.9 g / cm ^3, it is possible to obtain a cylindrical body that is light and has a low density and an appropriate strength.
Further, 2-4 neutral papers having a basis weight of 80-120 g / m ² and a density of 0.65-0.9 g / cm ³ with a cold water extraction pH value in the range of 6.5-10.0. By winding the layers, it is possible to obtain a cylindrical body that is light and has a low density and an appropriate strength.

Further, in the second embodiment shown in FIG. 2, the double-layered cylindrical body 1 is constituted by one layer of inner neutral paper 12 and one layer of outer neutral paper 11. However, also in this case, the inner neutral paper 12 and the outer neutral paper 11 can be formed into a multiple-structured cylindrical body formed by laminating a plurality of neutral papers in a spiral shape. For example, ² to 12 layers of neutral paper 12 having a basis weight of 200 to 350 g / m ² and a density of 0.4 to 0.6 g / cm ³ having a cold water extraction pH value in the range of 6.5 to 8.5. Further, a neutral paper 11 having a basis weight of 80 to 120 g / m ² and a density of about 0.65 to 0.9 g / cm ³ having a cold water extraction pH value in the range of 6.5 to 10.0. By winding 2 to 4 layers, it is possible to obtain a cylindrical body that is light and has a low density and an appropriate strength.

As an adhesive for laminating a neutral paper and further a substrate having moisture resistance and / or gas barrier properties while being spirally wound, an adhesive composed only of polyvinyl alcohol, an adhesive mainly composed of polyvinyl alcohol Or an admixture of these. Examples of adhesives mainly composed of polyvinyl alcohol include pastes based on polyvinyl alcohol, natural glues such as dextrin, various starches, modified starches, starch derivatives, fibrin derivatives, and algin, and polyacrylamides. A resin, synthetic resin such as vinyl acetate resin, ethylene vinyl acetate resin, acrylic ester resin or the like can be used.
The blending ratio in the case of blending a natural paste or synthetic resin with polyvinyl alcohol is desirably up to 40 parts by weight of the natural paste or synthetic resin with respect to 60 parts by weight of polyvinyl alcohol. However, some natural pastes and synthetic resins used in this formulation are acidic or contain free acids, so they are neutralized with alkaline chemicals such as borax, sodium carbonate, calcium carbonate, and so on. It is necessary to adjust the pH value to neutral to weak alkaline. Moreover, antiseptic | preservative, an antifungal agent, an antibacterial agent etc. can also be used together as needed.

In the present invention, it is preferable to use an adhesive mainly composed of polyvinyl alcohol and / or polyvinyl alcohol for the following reason.
Conventional paper tubes made of acid paper mainly use vinyl acetate resin as an adhesive. However, adhesives mainly composed of vinyl acetate resin contain free acetic acid and have an acidic pH. It is extremely harmful for the preservation of materials. Adhesives such as glue and gelatin have high nutritional value, and such high-adhesive adhesives should be used as adhesives for neutral paper tubes so that many insect bites can be seen in books that use them. Is not preferred.
On the other hand, the adhesive mainly composed of polyvinyl alcohol and / or polyvinyl alcohol not only has the above-mentioned problems, but the amount of use is higher than that of the adhesive mainly composed of vinyl acetate resin. About 1/5 is sufficient, and it is possible to make the usage-amount of the adhesive agent required for one bonding into 10 g / m < ² > or less.
Moreover, since the neutral paper is basically low density and thick, it can be made into a cylindrical body with a predetermined thickness with a small number of times of bonding, and as a result, the number of times of bonding is reduced, so the amount of adhesive used can be reduced. It can be greatly reduced.
As a result, since it becomes a low density and light cylindrical body, it can be easily cut with a cutter or the like, and a neutral paper tube having a length corresponding to the size of the material can be obtained with good workability.

  The following examples 1 and 2 and comparative example 1 verified the discoloration and strength reduction of the cylindrical body.

[Example 1]
50 parts by weight of linter pulp, 20 parts by weight of softwood bleached kraft pulp (NBKP), 30 parts by weight of hardwood bleached kraft pulp (LBKP) is 450 ml C.I. S. F. The pulp slurry obtained by beating the powder was mixed with 0.2 parts by mass of calcium carbonate (trade name “Charcoal Cal Plite 100”, manufactured by Shiroishi Kogyo Co., Ltd.) to prepare a slurry having a concentration of 8% by mass. 0.2% by mass of a sizing agent (trade name “Size Pine K-903”, manufactured by Arakawa Chemical Industries, Ltd.) and a paper strength enhancer (trade name “Polyaclon CH-100”) based on the solid content mass of the slurry. And 0.2% by mass of Seiko Chemical Industry Co., Ltd.) and 0.5% by mass of cationized starch (trade name “Neotack L-1”, manufactured by Nippon Shokuhin Kako Co., Ltd.) A neutral paper (a) having a basis weight of 250 g / m ² was obtained using a long paper machine. The neutral paper (a) had a thickness of 0.45 mm, a density of 0.55 g / cm ³ , and a cold water extraction pH value of 7.2.

60 ml of softwood bleached kraft pulp (NBKP), 40 parts by weight of hardwood bleached kraft pulp (LBKP) in 400 ml C.I. S. F. In the same manner as the neutral paper (a) except that 5 parts by mass of calcium carbonate (trade name “Charcoal Cal-Plite 100”) was mixed with the pulp slurry obtained by beating the powder into 100 μg / m ² basis weight. Neutral paper (b) was obtained. The neutral paper (b) had a thickness of 0.14 mm, a density of 0.71 g / cm ³ , and a cold water extraction pH value of 8.7.

  The neutral papers (a) and (b) were slitted to form a 10 cm wide roll, and a cylindrical body was produced using a conventional paper tube production apparatus. At this time, as the adhesive, polyvinyl alcohol (trade name “Kuraray Poval 117”, manufactured by Kuraray Co., Ltd.) dissolved in a concentration of 15% by mass is used, and neutral paper (a) is spirally wound in four layers. Then, two layers of neutral paper (b) are spirally wound and pasted thereon to obtain a cylindrical body made of neutral paper having an inner diameter of 70 mm, a thickness of 2.1 mm, and a length of 2000 mm. It was.

[Example 2]
The neutral papers (a) and (b) obtained in Example 1 were slitted to form a 10 cm wide roll, and the neutral paper (a) was spirally formed in two layers in the same manner as in Example 1. After winding and bonding, nine sheets of neutral paper (b) are spirally wound and bonded onto it, and a cylindrical body made of neutral paper having an inner diameter of 70 mm, a thickness of 2.2 mm, and a length of 2000 mm is formed. Obtained.

[Comparative Example 1]
60 ml of softwood bleached kraft pulp (NBKP), 40 parts by weight of hardwood bleached kraft pulp (LBKP) in 400 ml C.I. S. F. The pulp slurry obtained by refining was adjusted to 8% by mass. 2% by mass of sizing agent (trade name “Size Pine E”, manufactured by Arakawa Chemical Industry Co., Ltd.) and 5% by mass of sulfuric acid clay (manufactured by Daimei Chemical Industry Co., Ltd.) are added to the solid mass of the slurry. After that, an acidic paper (e) having a basis weight of 100 g / m ² was obtained with a long paper machine by a conventional method. The acidic paper (e) had a thickness of 0.13 mm, a density of 0.77 g / cm ³ , and a cold water extraction pH value of 5.8.

  The acidic paper (e) was slitted to form a 10 cm wide roll, and a cylindrical body made of acidic paper was manufactured using a conventional paper tube manufacturing apparatus. At this time, vinyl acetate resin emulsion (trade name “Bond SP 220N” manufactured by Konishi Co., Ltd.) is used as an adhesive diluted to 45% by mass, and acidic paper (e) is spirally wound in 16 layers and bonded. A cylindrical body made of acidic paper having an inner diameter of 70 mm, a thickness of 2.1 mm, and a length of 2000 mm was obtained.

  About the cylindrical bodies of Examples 1 and 2 and Comparative Example 1 manufactured with an outer diameter of 74 mm and an inner diameter of 70 mm as targets, together with thickness, weight, density, cold water extraction pH value, total inorganic anion content and sulfate ion content Table 1 shows the results of measurement of the amount, and the evaluation results of discoloration and strength reduction. However, the weight was measured by cutting the cylindrical body into a 10 cm width. The difference in weight and density was due to the difference in the amount used due to the number of laminations and the type of adhesive (polyvinyl alcohol and vinyl acetate resin) and the use of low-density paper.

[discoloration]
The cylindrical bodies of Examples 1 and 2 and Comparative Example 1 were exposed to a constant temperature and humidity chamber at 80 ° C. and 80% RH for 21 days, the state of discoloration of the cylindrical bodies was confirmed visually, and the state before the start of the test And the state after the end of the test were compared and evaluated as follows. ○ was accepted.
○: No change in the color of the cylindrical body.
X: Discoloration was confirmed in the cylindrical body.

[Strength reduction]
The cylindrical bodies of Examples 1 and 2 and Comparative Example 1 were cut to a length of 30 cm, exposed to a constant temperature and humidity chamber at 80 ° C. and 80% RH for 21 days, and a 10 kg load was applied to the center of the cylindrical body. The fractured state at the time of firing was visually observed and evaluated as follows. ○ was accepted.
○: Cracks and cracks do not occur due to load.
X: Cracks or cracks were caused by the load.

As can be seen from Table 1, Examples 1 and 2 are (1) light and low density, (2) show moderate cold water extraction pH value, (3) total inorganic anion content is 300 mg / kg or less In addition, a cylindrical body made of desired neutral paper having a sulfate ion content of 70 mg / kg or less was obtained.
In contrast, in Comparative Example 1, the values (1) to (3) described above far exceeded the desired values.
As a result, Comparative Example 1 showed discoloration and strength reduction by forced deterioration treatment at 80 ° C. and 80% RH for 21 days, but Examples 1 and 2 could be evaluated as being durable.

  Next, the humidity change in the neutral paper tube accompanying the temperature change of the external environment and the adsorption performance of the pollutant gas in the neutral paper tube were verified by Example 3 and Comparative Example 2 below.

[Example 3]
Softwood bleached kraft pulp (NBKP) 40 parts by mass, amorphous inorganic powder (trade name “silica gel PA-270A”, manufactured by Fuji Silysia Chemical Ltd.), shell fossil (manufactured by Green Culture Co., Ltd.) A mixture of 5 parts by mass and 5 parts by mass of a heat-fusible substance (trade name “TJ04CN”, manufactured by Teijin Ltd.) are mixed with a uniform slurry obtained by disaggregation. Name "Neotack L-1") is added and dispersed in an amount of 0.5 mass% in terms of solid content, and a polymer anionic flocculant (trade name "Hi-Holder 351", manufactured by Kurita Kogyo Co., Ltd.) is added as a solid content. After adding 0.006% by mass in terms of conversion, humidity control and contaminated gas adsorbing paper (d) having a basis weight of 1200 g / m ² was obtained by a conventional long paper machine.

A cylindrical body having an inner diameter of 70 mm obtained in Example 1 was cut into a length of 500 mm, and commercially available metal lids were attached to both ends thereof to obtain a neutral paper tube. Inside the metal lid, the humidity-adjusted and polluted gas adsorbing paper (d) having a thickness of 3 mm and a basis weight of 1200 g / m ² obtained above was punched into a circular shape with a diameter of 70 mm, and polyvinyl alcohol (trade name “ What melt | dissolved Kuraraypoval 117 ") in 15 mass% density | concentration was bonded as an adhesive agent.

[Comparative Example 2]
A neutral paper tube was obtained in the same manner as in Example 3 except that the humidity control and contaminated gas adsorbing paper (d) was not bonded to the inside of the metal lid.

  Using the neutral paper tube obtained in Example 3 and Comparative Example 2, the humidity change in the neutral paper tube and the contamination gas in accordance with the temperature change of the external environment due to the humidity control and the presence or absence of the contaminated gas adsorbing paper (d) The adsorption performance was tested, and the results are shown in FIG. 5 and Table 2, respectively. In FIG. 5, the solid line indicates the relative humidity of Example 3, and the dotted line indicates the relative humidity of Comparative Example 2.

[Humidity change in neutral paper tube due to temperature change in external environment]
A thermo-hygrometer (data logger) was fixed in each of the cylindrical bodies of Example 3 and Comparative Example 2, and after adjusting for 6 hours in a constant temperature and humidity chamber of 22 ° C. and 55% RH, both ends of this cylindrical body were The lid used in Example 3 and Comparative Example 2 is fitted and closed, the periphery of the lid is covered with moisture-proof tape, and the temperature in the tank is changed to 22 ° C. → 12 ° C. → 40 ° C. → 22 ° C. every 6 hours. FIG. 5 shows the result of measuring the humidity change in the neutral paper tube when changed to.

[Adsorption performance of polluted gas]
The neutral paper tubes of Example 3 and Comparative Example 2 were prepared in the same number as the type of pollutant gas, and adjusted at 22 ° C. and 55% RH for 48 hours. A hole was made in a certain position of the neutral paper tube, and a gas having a constant concentration was injected. Then, the hole was sealed, and after 2 hours, the pollutant gas concentration in the neutral paper tube was measured and evaluated as follows. ○ was accepted. The evaluation results are shown in Table 2.
○: Concentration significantly decreased from the initial concentration.
X: The density did not decrease much.

  From the results shown in FIG. 5, it can be seen that unless moisture conditioning and contaminated gas adsorbing paper (d) is used as in Comparative Example 2, the amount of moisture absorbed and released is small, so that it is difficult to return to the original humidity especially at the time of temperature rise. On the other hand, it was confirmed that this point was greatly improved in Example 3 using the humidity control and polluted gas adsorbing paper (d). That is, in Example 3, since the humidity fluctuation in the neutral paper tube is small and kept within a certain range, it is understood that the use of the humidity control and the polluted gas adsorption paper (d) is effective for long-term storage of the material. .

  Further, as is clear from Table 2, the neutral paper tube using the humidity control and contaminated gas adsorbing paper (d) of Example 3 is compared with Comparative Example 2 not using the humidity control and contaminated gas adsorbing paper (d). Thus, it was confirmed that the adsorption performance was excellent for all kinds of polluted gases.

[Example 4]
The base material (c) (trade name “EVAL”) having moisture resistance and gas barrier properties is slitted to form a 10 cm wide take-up, and this base material (c) is made of the cylindrical body obtained in Example 2. Two layers were spirally wound and bonded to obtain a cylindrical body made of neutral paper having an inner diameter of 70 mm, a thickness of 2.25 mm, and a length of 2000 mm and a substrate having moisture resistance and gas barrier properties. As an adhesive at the time of pasting, what melt | dissolved polyvinyl alcohol (brand name "Kuraraypoval 117") in 15 mass% density | concentration was used. The neutral paper tube manufactured in this way is further improved in the entry and exit of moisture and the inflow of various pollutant gases by enhancing the hermeticity by the base material (c) having moisture resistance and gas barrier properties. It can be effectively prevented.

The neutral paper tube of the present invention is free from the generation of acidic substances from the neutral paper, and further has a moisture-adjusting and polluting gas-adsorbing layer provided on the inner side of the lid to prevent the influence of moisture and polluting gases from the outside. Since it can be reduced, it can be used as a container that enables safe storage and transportation of materials over a long period of time.
In addition, when storing and transporting wide and long materials exceeding a certain size that cannot fit in a storage shelf or storage case in a material storage facility, restoration workshop, or large work production workshop, etc., it is safe and appropriate. Can be used as a neutral paper tube.

It is a partially broken perspective view which shows the cylindrical body by 1st Embodiment of this invention using the neutral paper which has the cold water extraction pH value in the range of 6.5-10.0. Second embodiment of the present invention using neutral paper having a cold water extraction pH value in the range of 6.5 to 10.0 outside the neutral paper having a cold water extraction pH value in the range of 6.5 to 8.5 It is a partially broken perspective view which shows the cylindrical body by a form. The partially broken perspective view which shows the cylindrical body by 3rd Embodiment of this invention which provided the base material which has moisture-proof and / or gas barrier property in the outer side of the cylindrical body of 2nd Embodiment shown in FIG. It is. 1 is a partially broken view showing a neutral paper tube of the present invention in which a lid provided with a layer having humidity conditioning and pollutant gas adsorbability is attached to the end of the cylindrical body of the first embodiment shown in FIG. It is a perspective view. It is the figure which showed the humidity change in the neutral paper tube of Example 3 and Comparative Example 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Cylindrical body 3 ... Cover 11 ... Neutral paper whose cold water extraction pH value is in the range of 6.5-10.0 12 ... Cold water extraction pH value is 6.5-8. Neutral paper in the range of 5 13... Base material having moisture resistance and / or gas barrier properties 31... Layer having humidity control and contamination gas adsorption

Claims (6)

  The cold water extraction pH value is in the range of 6.5 to 10.0, the total inorganic anion content per kg of the mass after drying is 300 mg or less, and the sulfate ion content in the total inorganic anion content is 70 mg. Neutral paper for preserving data, characterized in that a cover having a moisture-controllable and pollutant gas adsorbing layer is provided at both ends of a cylindrical body formed by processing the following neutral paper into a cylindrical shape tube.   The neutral paper constituting the cylindrical body is made of neutral paper having a cold water extraction pH value in the range of 6.5 to 8.5, and a cold water extraction pH value in the range of 6.5 to 10.0. The neutral paper tube for preserving data according to claim 1, characterized in that it has an outer double structure made of neutral paper. The inner neutral paper having a cold water extraction pH value in the range of 6.5 to 8.5 contains 0.02 to 5 calcium carbonate with respect to 100 parts by mass of papermaking fibers in which 30% by mass or more of cotton fibers are mixed. The neutral paper tube for preserving data according to claim 2, wherein the neutral paper tube is contained in a mass part and has a density of 0.4 to 0.6 g / cm ³ .   The neutral material for storing materials according to any one of claims 1 to 3, further comprising a moisture-proof and / or gas-barrier base material provided on the outermost part of the cylindrical body. Paper tube.   A plurality of layers of the neutral paper, and if necessary, a substrate having moisture resistance and / or gas barrier properties is bonded with an adhesive while being spirally wound. 1. Neutral paper tube for preserving data according to item 1.   6. The neutral paper tube for preserving data according to claim 5, wherein polyvinyl alcohol and / or an adhesive mainly composed of polyvinyl alcohol is used as the adhesive.

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