JP2020163814A - Paper tube - Google Patents

Abstract

To provide a paper tube that is hard to be burnt.SOLUTION: A paper tube is obtained by layering a plurality of non-flammable sheets 1, in which the non-flammable sheets 1 contain a thermoplastic resin and an inorganic material, and a content of the inorganic material is 15-90 mass% with respect to the mass of the non-flammable sheets 1.SELECTED DRAWING: Figure 2

Description

The present invention relates to a paper tube used for interior materials, furniture materials, and the like.

The paper tube is lightweight and can have a predetermined strength.
Then, in Patent Document 1, a plurality of paper tubes are connected in parallel with a sheet to form a paper tube panel, and the paper tube panel is configured as an interior material such as a partition, a ceiling material, a floor material, and a door material, and a furniture material. It has been proposed to be used as a component.
However, the conventional paper tube has a problem that it is easily burned because it is made of paper.

Square root extraction 6-27130

The present invention has been made focusing on the above-mentioned problems, and an object of the present invention is to provide a non-combustible paper tube.

In order to solve the problem, in the paper tube according to one aspect of the present invention, a plurality of non-combustible sheets are laminated, the non-combustible sheet contains a thermoplastic resin and an inorganic material, and the content of the inorganic material is non-combustible. It is in the range of 15% by mass or more and 90% by mass or less with respect to the mass of the sheet.

According to the aspect of the present invention, by forming the paper tube from a non-combustible sheet containing a thermoplastic resin and an inorganic material, it has non-combustibility that is difficult to penetrate a flame. In addition, it has heat-resistant shape retention and does not easily lose its shape even when heat is applied due to a fire or the like.
Here, in buildings such as residential and commercial facilities, station buildings, airports and other public facilities, evacuation routes such as living rooms, corridors and stairs are used for a certain scale and purpose in order to prevent them from spreading in the event of a fire. Is required by law (Article 129 of the Enforcement Ordinance) that fireproof materials (non-combustible materials, semi-non-combustible materials and flame-retardant materials) must be used for the finishing materials of the walls and ceilings according to their required performance. Has been done.

Even if the interior material or furniture material is made of a paper tube in such a place, the paper tube of the present invention can impart nonflammability without spoiling the aesthetic appearance.
Here, the nonflammability of the paper tube of the present invention is based on the cone calorie combustion test based on ISO5660-1, and when the total calorific value with respect to time and the heat generation rate with respect to time of the paper tube are determined, (i) The total calorific value for 20 minutes after the start of heating is 8 MJ / m ² or less, (ii) for 20 minutes after the start of heating, the maximum heat generation rate continues for 10 seconds or more and does not exceed 200 kW / m ² , and (iii) heating. For 20 minutes after the start, it is preferable to have nonflammability that satisfies the absence of cracks and holes penetrating from the outside to the inside, which are harmful to fire protection.

It is a figure which shows the structure of the non-combustible sheet which concerns on embodiment based on this invention. It is a figure which shows the state which the non-combustible sheet which concerns on embodiment based on this invention is laminated. It is a figure which shows the example which made up the chair with the paper tube which concerns on embodiment based on this invention. It is a figure which shows the example which finished the ceiling with the paper tube which concerns on embodiment based on this invention.

Next, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a front surface anchor layer 3a is formed on the front surface (first surface) of the non-combustible sheet 1 in the present embodiment, and a back surface anchor layer 3a is formed on the back surface (second surface) of the non-combustible sheet 1. 3b is formed. Then, in the paper tube of the present embodiment, as shown in FIG. 2, the non-combustible sheets 1 provided with the anchor layers (front surface anchor layer 3a and back surface anchor layer 3b) are connected to each other via, for example, the inorganic adhesive layer 2. It is formed by stacking a plurality of layers.
The number of layers of the non-combustible sheet 1 is not particularly limited, but since the strength and rigidity are secured as the number of layers of the non-combustible sheet 1 increases, the number of layers can be adjusted according to the strength and rigidity required for applications using paper tubes. You can set it.

However, as will be described later, stacking of 4 to 7 layers is preferable from the viewpoint of obtaining sufficient nonflammability.
The method for producing the paper tube is not particularly limited, and the paper tube may be produced by a known production method. For example, as described in JP-A-63-249637, etc., a non-combustible sheet 1 is spirally wound around a core material to be laminated to form a spiral paper tube, or JP-A-7-285184, etc. As in the above, paper may be wound around the core material in sequence to create a linear paper tube.
The cross-sectional shape of the paper tube is not particularly limited as long as it is a cylindrical shape, a circular shape, a square shape, or another shape.

Hereinafter, each configuration of the non-combustible sheet 1, the front surface anchor layer 3a, the back surface anchor layer 3b, and the inorganic adhesive layer 2 will be described.
(Non-combustible sheet 1)
The non-combustible sheet 1 is a sheet-like member formed of a material that does not easily burn even when in contact with fire.
The non-combustible sheet 1 is, for example, a member containing a thermoplastic resin and an inorganic material.
The content of the inorganic material of the present embodiment may be in the range of 15% by mass or more and 90% by mass or less, and in the range of 20% by mass or more and 80% by mass or less with respect to the mass of the noncombustible sheet 1. More preferably, it is more preferable if it is in the range of 60% by mass or more and 80% by mass or less. When the content of the inorganic material is less than 15% by mass with respect to the mass of the noncombustible sheet 1, the proportion of the thermoplastic resin is relatively large, so that it tends to be difficult to obtain nonflammability or flame retardancy. Further, when the surface of the non-combustible sheet 1 is scratched with a Hoffman scratch tester, it may be scratched to a visible extent, that is, sufficient surface hardness may not be obtained. On the other hand, when the content of the inorganic material exceeds 90% by mass with respect to the mass of the non-combustible sheet 1, the proportion of the thermoplastic resin becomes relatively small. Therefore, when the surface of the non-combustible sheet 1 is coated with an anchor layer or an inorganic adhesive layer, so-called "powder blowing" may occur on the surface of the non-combustible sheet 1. Here, "powder blowing" means that the inorganic material contained in the non-combustible sheet 1 emerges on the surface of the non-combustible sheet 1. When powder blowing occurs, the back surface anchor layer 3b, the front surface anchor layer 3a, or the inorganic adhesive layer 2 is formed by the inorganic material that emerges from the non-combustible sheet 1. 2 may become difficult to stack, that is, the coating suitability of the back surface anchor layer 3b, the front surface anchor layer 3a, or the inorganic adhesive layer 2 may decrease. Further, when the sheet forming at least one of the front surface anchor layer 3a and the back surface anchor layer 3b is bent and reopened, cracks may occur from the bent portion or the inorganic material may fall off.

As described above, the content of the inorganic material of the present embodiment is 15% by mass or more and 90% by mass or less, preferably 20% by mass or more and 80% by mass or less, and more preferably 60% by mass or more with respect to the mass of the non-combustible sheet 1. Within the range of 80% by mass or less, while obtaining nonflammability or flame retardancy, the occurrence of powder blowing is reduced, the coating suitability of the back surface anchor layer 3b and the front surface anchor layer 3a is improved, and inorganic adhesion is achieved. It is possible to improve the coating suitability of the agent layer 2, reduce the occurrence of cracks at the bent portion of the sheet, further obtain sufficient surface hardness, and improve the adhesiveness of the adhesive.

Further, the inorganic material of the present embodiment is preferably in a powder shape (powder shape), and its average particle diameter is preferably in the range of 1 μm or more and 3 μm or less, and the maximum particle diameter is preferably 50 μm or less. .. When the average particle size and the maximum particle size of the inorganic material are within the above numerical ranges, the flatness of the surface of the noncombustible sheet 1 can be maintained while improving the dispersibility of the inorganic material with respect to the thermoplastic resin. If the average particle size of the inorganic material is less than 1 μm, the cohesive force between the inorganic materials may increase, and the dispersibility in the thermoplastic resin described later may decrease. Further, when the average particle size of the inorganic material exceeds 3 μm or the maximum particle size of the inorganic material exceeds 50 μm, the flatness of the surface of the non-combustible sheet 1 deteriorates, and the front surface anchor layer 3a or the back surface anchor layer 3b described later The thickness of the particles may be uneven, or unevenness or chipping may occur. In this embodiment, the "average particle size" means the mode diameter.

The inorganic material is, for example, a powder containing at least one of calcium carbonate and calcium carbonate salt. The powder containing at least one of calcium carbonate and calcium carbonate salt is preferably contained in the range of 50% by mass or more and 100% by mass or less. That is, the purity of the powder containing at least one of calcium carbonate and calcium carbonate salt is preferably in the range of 50% by mass or more and 100% by mass or less of calcium carbonate or the like. A powder containing at least one of calcium carbonate and a calcium carbonate salt containing 50% by mass or more of calcium carbonate or the like can impart sufficient nonflammability or sufficient flame retardancy to the noncombustible sheet 1. At the same time, sufficient mechanical strength can be imparted.

As the inorganic material, in addition to the powder containing at least one of the calcium carbonate and the calcium carbonate salt, for example, zirconium such as silica (particularly hollow silica), alumina, antimony trioxide, antimony soda, zircon silicate, and zircon oxide. Antimony trioxide and silica complex, antimony trioxide, such as compounds, magnesium hydroxide, aluminum hydroxide, basic magnesium carbonate, borosand, zinc borate, molybdenum trioxide or antimony dimolybate and aluminum hydroxide At least one such as a complex of aluminum hydroxide with zinc hydroxide, silicic acid of aluminum hydroxide, a complex of a zirconium compound with antimony trioxide, and salts thereof. In particular, calcium carbonate and calcium carbonate salt can easily control the particle size and compatibility with the thermoplastic resin by the manufacturing method, and the material cost is low, so from the viewpoint of reducing the cost of the non-combustible sheet 1. Is also suitable.

Further, the inorganic material may be a powder material having crystallinity, so-called crystalline powder, or a powder material having no crystallinity, so-called amorphous type powder material. If the inorganic material is a crystalline powder material, the powder itself is homogeneous and hasotropic, so that the mechanical strength of the powder itself is improved, and the scratch resistance and durability of the non-combustible sheet 1 tend to be improved. Further, if the inorganic material is an amorphous type powder material, the electrical conductivity and thermal conductivity of the powder itself, or the light transmittance and light absorption rate can be appropriately adjusted, so that there are variations in tactile sensation and luster. It is possible to give abundant design.

The thermoplastic resin of the present embodiment preferably contains at least one of polypropylene, polyethylene and polyester, and more preferably polypropylene. By using at least one of polypropylene, polyethylene and polyester as the thermoplastic resin, the dispersibility of the inorganic material is improved. Further, by using polypropylene as the thermoplastic resin, the dispersibility of the inorganic material is further improved. In addition, polystyrene can also be used as a thermoplastic resin.

Further, the total content of the thermoplastic resin and the inorganic material is preferably in the range of 90% by mass or more and 100% by mass or less with respect to the mass of the noncombustible sheet 1. When the total content of the thermoplastic resin and the inorganic material is within the above numerical range, the coating suitability of the back surface anchor layer 3b and the front surface anchor layer 3a and the inorganic system can be obtained while obtaining sufficient nonflammability or sufficient flame retardancy. It is possible to improve the coating suitability of the adhesive layer 2 and reduce the cracks generated in the bent portion of the sheet. If the total content of the thermoplastic resin and the inorganic material is less than 90% by mass with respect to the mass of the non-combustible sheet 1, sufficient non-flammability or sufficient flame retardancy may not be obtained. Further, the coating suitability of the back surface anchor layer 3b and the front surface anchor layer 3a and the coating suitability of the inorganic adhesive layer 2 may be lowered, or cracks may occur in the bent portion of the sheet.

When the total content of the thermoplastic resin and the inorganic material is 100% by mass with respect to the mass of the non-combustible sheet 1, the content of the thermoplastic resin is in the range of 10% by mass or more and 85% by mass or less. It is preferable that the content of the inorganic material is in the range of 15% by mass or more and 90% by mass or less. Further, it is more preferable that the content of the thermoplastic resin is in the range of 20% by mass or more and 80% by mass or less, and the content of the inorganic material is in the range of 20% by mass or more and 80% by mass or less. Further, it is more preferable that the content of the thermoplastic resin is in the range of 20% by mass or more and 40% by mass or less, and the content of the inorganic material is in the range of 60% by mass or more and 80% by mass or less. When the total content of the thermoplastic resin and the inorganic material is within the above numerical range, the coating suitability of the back surface anchor layer 3b and the front surface anchor layer 3a can be obtained while ensuring sufficient nonflammability or sufficient flame retardancy. It is possible to surely improve the coating suitability of the inorganic adhesive layer 2 and surely reduce the cracks generated in the bent portion of the sheet.

The thickness of the non-combustible sheet 1 is preferably in the range of 50 μm or more and 250 μm or less, and more preferably in the range of 70 μm or more and 200 μm or less. When the thickness of the non-combustible sheet 1 is within the above numerical range, it is possible to improve the bonding suitability when the non-combustible sheets 1 are laminated and laminated, and to reduce the cracks generated in the bent portion of the sheet. If the thickness of the non-combustible sheet 1 is less than 50 μm, the suitability for bonding the non-combustible sheets 1 to each other tends to decrease. Further, if the thickness of the non-combustible sheet 1 exceeds 250 μm, cracks may occur in the bent portion of the sheet. In order to keep the thickness of the non-combustible sheet 1 within the range of 50 μm or more and 250 μm or less, the basis weight of the non-combustible sheet 1 may be within the range of 35 [g / m ² ] or more and 400 [g / m ² ] or less. preferable.
Further, the non-combustible sheet 1 is preferably a uniaxially stretched or biaxially stretched non-combustible material. If the non-combustible sheet 1 is a uniaxially stretched or biaxially stretched non-combustible material, the versatility as a paper tube can be enhanced.

It is preferable that at least one of the front surface and the back surface of the non-combustible sheet 1 is subjected to surface treatment such as corona treatment or plasma treatment before forming, for example, the front surface anchor layer 3a and the back surface anchor layer 3b, which will be described later. By applying surface treatment such as corona treatment or plasma treatment to at least one of the front surface and the back surface of the non-combustible sheet 1, the adhesiveness (adhesion) between the front surface anchor layer 3a and the back surface anchor layer 3b and the non-combustible sheet 1 is improved. To do.
Further, before forming the front surface anchor layer 3a and the back surface anchor layer 3b, for example, at least one of the front surface and the back surface of the noncombustible sheet 1 is brushed, and at least one of the powder-blown inorganic material, for example, calcium carbonate and calcium carbonate salt. The powder containing calcium carbonate may be removed in advance.

(Surface anchor layer)
The surface anchor layer 3a is a layer formed so as to cover the entire surface of the non-combustible sheet 1 and is a layer for preventing powder falling off of the inorganic material contained in the non-combustible sheet 1. If the inorganic material contained in the non-combustible sheet 1 falls off in the coating system, specifically, in the coating device when the inorganic adhesive layer 2 is coated, the inside of the coating system may be contaminated. Further, when the inorganic material contained in the non-combustible sheet 1 is powdered off, there is a possibility that problems such as removal of the inorganic adhesive layer 2 for adhering the non-combustible sheets 1 to each other may occur. Here, "the removal of the inorganic adhesive layer" means that the inorganic adhesive layer 2 is not partially coated.

Further, the surface anchor layer 3a also has a function of improving the adhesion between the non-combustible sheet 1 and the adhesive contained in the inorganic adhesive layer 2 described later. If the surface anchor layer 3a is not provided, the adhesive contained in the inorganic adhesive layer 2 may peel off without adhering to the non-combustible sheet 1.
The surface anchor layer 3a preferably contains a urethane-based resin containing vinyl acetate or an acrylic resin containing vinyl acetate. Here, "salt vinegar bi" means a copolymer of vinyl chloride and vinyl acetate. The "urethane resin containing salt vinegar" is a composition containing salt vinegar and urethane resin, and the ratio of the content of salt vinegar to the content of urethane resin (salt vinegar). The bi content (mass) / urethane resin content (mass)) may be in the range of 80/20 to 1/99, preferably in the range of 50/50 to 5/95, 20 It is more preferable if it is in the range of / 80 to 10/90.

Further, the "urethane-based resin containing vinyl acetate" may contain a curing agent in addition to the above-mentioned vinyl acetate and urethane-based resin. This curing agent is added to reliably cure the urethane-based resin containing vinyl acetate, and the content thereof is not particularly limited. For example, the ratio of the content of the urethane resin containing vinyl acetate to the content of the curing agent (content of urethane resin containing vinyl acetate (mass) / content of curing agent (mass)) is 99. It may be in the range of / 1 to 1/99, preferably in the range of 99/1 to 50/50, and more preferably in the range of 95/5 to 90/10.

The content of the urethane resin containing salt and vinegar or the acrylic resin containing salt and vinegar in the surface anchor layer 3a is in the range of 15% by mass or more and 100% by mass or less with respect to the mass of the surface anchor layer 3a. The range of 80% by mass or more and 100% by mass or less is more preferable, and the range of 85% by mass or more and 95% by mass or less is further preferable. When the content of the urethane resin containing vinyl acetate or the acrylic resin containing vinyl acetate in the surface anchor layer 3a is within the above numerical range, the layer between the surface anchor layer 3a and the inorganic adhesive layer 2 It is possible to form a uniform surface anchor layer 3a without unevenness or chipping while maintaining sufficient strength. When the content of the urethane resin containing vinyl acetate or the acrylic resin containing vinyl acetate in the surface anchor layer 3a is less than 15% by mass with respect to the mass of the surface anchor layer 3a, the surface anchor layer 3a and The interlayer strength with the inorganic adhesive layer 2 may be insufficient. Further, if the content of the urethane resin containing salt and vinegar or the acrylic resin containing salt and vinegar in the surface anchor layer 3a is less than 80% by mass with respect to the mass of the surface anchor layer 3a, there is no problem in use. Although there is no problem, the ratio of the surface anchor layer 3a to the non-combustible sheet 1 is lowered, and the interlayer strength between the surface anchor layer 3a and the non-combustible sheet 1 is slightly lowered. If the content of the urethane resin containing vinyl acetate or the acrylic resin containing vinyl acetate in the surface anchor layer 3a is 100% by mass or less with respect to the mass of the surface anchor layer 3a, there is no problem in use. However, if it exceeds 95% by mass, or more accurately 98% by mass, the surface anchor layer 3a may be chipped due to insufficient curing, or the surface anchor layer 3a and the non-combustible sheet 1 or the surface anchor layer 3a may be inorganically adhered. The interlayer strength with the agent layer 2 may decrease.

The content of the urethane resin containing vinyl acetate or the acrylic resin containing vinyl acetate in the front surface anchor layer 3a is the urethane resin containing vinyl acetate or the vinyl acetate in the back surface anchor layer 3b, which will be described later. It may be the same as the content of the acrylic resin containing. That is, the content of the urethane-based resin containing vinyl acetate or the acrylic resin containing vinyl acetate in the front surface anchor layer 3a includes the urethane-based resin containing vinyl acetate or the vinyl acetate in the back surface anchor layer 3b. It may be 1.0 times (within the range of 0.95 times or more and 1.04 times or less) the content of the acrylic resin. The content of the urethane resin containing salt and vinegar in the front anchor layer 3a or the acrylic resin containing salt and vinegar is the urethane resin containing salt and vinegar or the acrylic resin containing salt and vinegar in the back surface anchor layer 3b. When the content is the same as the resin content, the physical properties of the front surface anchor layer 3a and the physical properties of the back surface anchor layer 3b are almost the same, so that the noncombustible sheet 1 is provided with the front surface anchor layer 3a and the back surface anchor layer 3b. , The occurrence of distortion and warpage can be reduced. Therefore, it is possible to reduce the occurrence of distortion and warpage of the entire body including the non-combustible sheet 1. Further, since the coating liquid for forming the front surface anchor layer 3a and the coating liquid for forming the back surface anchor layer 3b can be shared, the manufacturing cost can be reduced and the work efficiency can be improved. be able to.

The content of the urethane-based resin containing vinyl acetate or the acrylic resin containing vinyl acetate in the front surface anchor layer 3a includes the urethane-based resin containing vinyl acetate or the vinyl acetate in the back surface anchor layer 3b. It may be higher or lower than the content of the acrylic resin. The content of the urethane resin containing salt and vinegar in the front anchor layer 3a or the acrylic resin containing salt and vinegar is the urethane resin containing salt and vinegar in the back surface anchor layer 3b, or the acrylic resin containing salt and vinegar. If the content is higher or lower than the resin content, the physical properties of the front surface anchor layer 3a and the back surface anchor layer 3b are different, so that the noncombustible sheet 1 provided with the front surface anchor layer 3a and the back surface anchor layer 3b is distorted. Warpage and the like can be imparted. In this way, by imparting distortion, warpage, or the like to the noncombustible sheet 1 provided with the front surface anchor layer 3a and the back surface anchor layer 3b, the noncombustible sheet 1 can be attached to a base material or the like having a curved surface without gaps. it can. For example, the content of the urethane-based resin containing vinyl acetate or the acrylic resin containing vinyl acetate in the front surface anchor layer 3a includes the urethane-based resin containing vinyl acetate or the vinyl acetate in the back surface anchor layer 3b. The content of the acrylic resin may be 1.1 times or more and 10 times or less, or 0.1 times or more and 0.9 times or less.

The thickness of the surface anchor layer 3a is, for example, in the range of 0.5 μm or more and 20 μm or less, and preferably in the range of 0.5 μm or more and 10 μm or less. Further, the thickness of the front surface anchor layer 3a may be the same as the thickness of the back surface anchor layer 3b. When the thickness of the front surface anchor layer 3a is the same as the thickness of the back surface anchor layer 3b, the physical properties of the front surface anchor layer 3a and the physical properties of the back surface anchor layer 3b are almost the same. In the state where the back surface anchor layer 3b is provided, the occurrence of distortion, warpage, etc. can be reduced.

Further, the thickness of the front surface anchor layer 3a may be thicker or thinner than the thickness of the back surface anchor layer 3b. By making the thickness of the front surface anchor layer 3a different from the thickness of the back surface anchor layer 3b, a difference in gloss is generated, so that the front surface side and the back surface side of the noncombustible sheet 1 can be easily visually recognized. By doing so, the inorganic adhesive layer 2 can be formed on the surface of the non-combustible sheet 1 without forming, for example, an identification mark indicating that the surface is the formation surface of the inorganic adhesive layer 2. As a result, product loss caused by forming the inorganic adhesive layer 2 on the back surface (non-forming surface of the inorganic adhesive layer 2) side of the non-combustible sheet 1 can be reduced.
In the present embodiment, as the resin constituting the surface anchor layer 3a, a urethane-based resin containing vinyl acetate or an acrylic resin containing vinyl acetate has been mentioned, but the present invention is not limited thereto. .. The surface anchor layer 3a may be formed of, for example, a resin containing only vinyl acetate.

(Back anchor layer)
The back surface anchor layer 3b is a layer formed so as to cover the entire back surface of the non-combustible sheet 1 and is a layer for preventing powder falling off of the inorganic material contained in the non-combustible sheet 1.
The back surface anchor layer 3b preferably contains a urethane resin containing vinyl acetate or an acrylic resin containing vinyl acetate.

The content of the urethane resin containing salt and vinegar or the acrylic resin containing salt and vinegar in the back surface anchor layer 3b is, for example, in the range of 15% by mass or more and 100% by mass or less with respect to the mass of the back surface anchor layer 3b. Is preferable, the range of 80% by mass or more and 100% by mass or less is more preferable, and the range of 85% by mass or more and 95% by mass or less is further preferable. If the content of the urethane resin containing vinyl acetate or the acrylic resin containing vinyl acetate in the back surface anchor layer 3b is within the above numerical range, a uniform back surface anchor layer 3b without unevenness or chipping is formed. be able to. When the content of the urethane resin containing vinyl acetate or the acrylic resin containing vinyl acetate in the back surface anchor layer 3b is less than 15% by mass with respect to the mass of the back surface anchor layer 3b, the back surface anchor layer 3b Coating may be inadequate. Further, if the content of the urethane resin containing salt and vinegar or the acrylic resin containing salt and vinegar in the back surface anchor layer 3b is less than 80% by mass with respect to the mass of the back surface anchor layer 3b, there is no problem in use. Although there is no problem, the ratio of the back surface anchor layer 3b biting into the non-combustible sheet 1 is reduced, and the interlayer strength between the back surface anchor layer 3b and the non-combustible sheet 1 is slightly reduced. If the content of the urethane resin containing salt and vinegar or the acrylic resin containing salt and vinegar in the back surface anchor layer 3b is 100% by mass or less with respect to the mass of the back surface anchor layer 3b, there is no problem in use. However, if it exceeds 95% by mass, or more accurately 98% by mass, the back surface anchor layer 3b may be chipped due to insufficient curing, or the interlayer strength between the back surface anchor layer 3b and the noncombustible sheet 1 may decrease. There is.
The thickness of the back surface anchor layer 3b is, for example, in the range of 0.5 μm or more and 20 μm or less, and preferably in the range of 0.5 μm or more and 10 μm or less.
In the present embodiment, as the resin constituting the back surface anchor layer 3b, a urethane-based resin containing vinyl acetate or an acrylic resin containing vinyl acetate is mentioned, but the present invention is not limited thereto. .. The back surface anchor layer 3b may be formed of, for example, a resin containing only vinyl acetate.

The basis weight of the non-combustible sheet 1 is preferably in the range of 35 [g / m ² ] or more and 400 [g / m ² ] or less, and 120 [g / m ² ] or more and 250 [g / m ² ] or less. It is more preferably within the following range. As long as the basis weight of the non-combustible sheet 1 is within the above numerical range, the non-combustible sheet 1 is provided with fire resistance regardless of whether it is stretched (uniaxially stretched or biaxially stretched) or non-stretched. be able to. When the basis weight of the non-combustible sheet 1 is 35 [g / m ² ] or more, the thickness of the non-combustible sheet 1 can be 50 μm or more, and the non-combustible sheet 1 can be easily handled at the time of construction or the like. Further, when the basis weight of the non-combustible sheet 1 is 400 [g / m ² ] or less, the thickness of the non-combustible sheet 1 can be 250 μm or less, and the non-combustible sheet 1 can be easily handled at the time of construction or the like. Further, when the basis weight of the non-combustible sheet 1 is 120 [g / m ² ] or more, the thickness of the non-combustible sheet 1 can be 80 μm or more, and the handling of the non-combustible sheet 1 at the time of construction or the like becomes easier. Further, when the basis weight of the non-combustible sheet 1 is 250 [g / m ² ] or less, the thickness of the non-combustible sheet 1 can be reduced to 200 μm or less, and the handling of the non-combustible sheet 1 at the time of construction or the like becomes easier.
In the present embodiment, the case where the back surface anchor layer 3b is provided has been described, but the present invention is not limited to this. For example, the back surface anchor layer 3b may not be formed.

(Inorganic adhesive layer 2)
The inorganic adhesive layer 2 is a sheet-like layer formed by using the inorganic adhesive, and plays a role of adhering the non-combustible sheets 1 to each other.
Examples of the inorganic adhesive forming the inorganic adhesive layer 2 include a silica-based adhesive containing silica as a main component, a ceramic-based adhesive containing ceramic as a main component, and a cement-based adhesive containing cement as a main component. Is preferably used. As the inorganic adhesive forming the inorganic adhesive layer 2, for example, sodium silicate, a modified silicon adhesive, an alumina adhesive, or a magnesia adhesive may be used.
By forming the inorganic adhesive layer 2 using the inorganic adhesive, it is possible to improve the fire resistance as compared with the adhesive layer formed by using the organic adhesive. In addition, nonflammability can be improved.

Here, in buildings such as residential and commercial facilities, station buildings, airports and other public facilities, evacuation routes such as living rooms, corridors and stairs are used for a certain scale and purpose in order to prevent them from spreading in the event of a fire. Is required by law (Article 129 of the Enforcement Ordinance) that fireproof materials (non-combustible materials, semi-non-combustible materials and flame-retardant materials) must be used for the finishing materials of the walls and ceilings according to their required performance. Has been done.
On the other hand, as described above, the paper tube of the present embodiment exhibits non-combustibility, so that it can be applied to places where non-combustibility is required and does not spoil the aesthetic appearance.
Here, a metal plate such as an aluminum thin plate or glass paper may be inserted between the non-combustible sheets 1 to be laminated. The metal plate or glass paper shall be a thin plate with a thickness that can be deformed by winding it in a tubular shape.

By inserting a metal plate or glass paper, the rigidity of the paper tube can be improved, so that the number of laminated non-combustible sheets 1 can be suppressed.
Further, a paper tube may be formed by winding a composite base material having a metal plate or glass paper interposed between two non-combustible sheets 1 around a core material so that the number of layers is three. The number of laminated composite substrates may be two, but is preferably three or more.
An example of using the paper tube of this embodiment is shown in FIGS. 3 and 4. FIG. 3 shows an example in which a paper tube is applied to the seating surface of the chaise longue, and FIG. 4 shows a design of the ceiling suspended from the ceiling. Of course, the present invention is not limited to this example, and a partition wall may be formed or a table leg may be formed.

[Example]
The following evaluations were carried out on the nonflammability of paper tubes.
(Examples 1 and 2)
The evaluation was performed on a flat sample in which the non-combustible sheet 1 provided with the front surface anchor layer 3a and the back surface anchor layer 3b was stacked.
As the non-combustible sheet 1, a non-combustible sheet 1 containing 80% by mass of calcium carbonate, which is an inorganic material, and 20% by mass of polypropylene resin was prepared. The thickness of the non-combustible sheet 1 is 50 μm.
A sample of Example 1 in which four such non-combustible sheets 1 were stacked and a sample of Example 2 in which five non-combustible sheets 1 were stacked were prepared. As an adhesive for adhering the non-combustible sheets 1 to each other, a silica-based adhesive containing silica as a main component was used.

(Comparative Examples 1 and 2)
The evaluation was performed on a flat sample in which the non-combustible sheet 1 provided with the front surface anchor layer 3a and the back surface anchor layer 3b was stacked.
As the non-combustible sheet 1, a non-combustible sheet 1 containing 12% by mass of calcium carbonate, which is an inorganic material, and 88% by mass of polypropylene resin was prepared. The thickness of the non-combustible sheet 1 is 50 μm.
A sample of Comparative Example 1 in which four such non-combustible sheets 1 were stacked and a sample of Comparative Example 2 in which five non-combustible sheets 1 were stacked were prepared. As an adhesive for adhering the non-combustible sheets 1 to each other, a silica-based adhesive containing silica as a main component was used.
Then, three samples were prepared as Example 1 and Example 2, and Comparative Example 1 and Comparative Example 2, respectively, and the nonflammability test was performed.
The nonflammability test is based on ISO5660-1, and heat is generated by a cone calorimeter tester that complies with the fireproof test method and performance evaluation standard based on Article 2-9 of the Building Standards Act and Article 108-2 of the Building Standards Act Construction Ordinance. A sex test was conducted.
The gross calorific value of the heating starting after 20 min (MJ / ^{m 2)} it is, and the 8 MJ / ^{m 2} or less, the maximum heat release rate of the start of heating after 20 minutes, exceed 200 kW / ^{m 2} to continue for 10 seconds or more If not, it was passed. However, it was also a condition that the base material had no cracks or holes.
The test results are shown in Table 1.

As can be seen from Table 1, the samples of Example 1 and Example 2 satisfy the above test criteria. On the other hand, it can be seen that the samples of Comparative Example 1 and Comparative Example 2 do not satisfy the above test criteria.
Then, a non-combustible material that has passed such a non-combustible test may be molded into a paper tubular shape and used.
Here, in Examples 1 and 2, the stacking of the noncombustible sheet 1 was changed to 6 to 9 layers, and in the case of 8 or more layers, the total calorific value (MJ / m ² ) for 20 minutes after the start of heating. However, it exceeded 8 MJ / m ² . Therefore, from the viewpoint of nonflammability, the number of laminated noncombustible sheets 1 is preferably 7 or less.

1 ... Non-combustible sheet 2 ... Inorganic adhesive layer 3a ... Front surface anchor layer 3b ... Back surface anchor layer

Claims (10)

Laminate multiple non-combustible sheets,
The non-combustible sheet contains a thermoplastic resin and an inorganic material, and contains
A paper tube characterized in that the content of the inorganic material is in the range of 15% by mass or more and 90% by mass or less with respect to the mass of the non-combustible sheet. The paper tube according to claim 1, wherein the inorganic material has a powder shape, an average particle diameter in the range of 1 μm or more and 3 μm or less, and a maximum particle diameter of 50 μm or less. The inorganic materials include antimony trioxide, antimony soda, zirconium silicate, zirconium oxide, magnesium hydroxide, aluminum hydroxide, basic magnesium carbonate, borosand, zinc borate, calcium carbonate, molybdenum trioxide or antimony dimolybate and water. It is characterized by containing at least one of aluminum oxide complex, antimony trioxide and silica complex, antimony trioxide and zinc flower complex, silicic acid of zirconium, and zirconium compound and antimony trioxide complex, and salts thereof. The paper tube according to claim 1 or 2. The paper tube according to any one of claims 1 to 3, wherein the thermoplastic resin contains at least one of polypropylene, polyethylene and polyester. Claims 1 to 4 are characterized in that the total content of the thermoplastic resin and the inorganic material is in the range of 90% by mass or more and 100% by mass or less with respect to the mass of the noncombustible sheet. The paper tube according to any one of the above. The paper tube according to any one of claims 1 to 5, wherein the thickness of the non-combustible sheet is within the range of 50 μm or more and 250 μm or less. A first anchor layer formed on the first surface of the non-combustible sheet and a second anchor layer formed on a second surface of the non-combustible sheet opposite to the first surface. With
Claims 1 to 6, wherein the first anchor layer and the second anchor layer each contain a urethane-based resin containing vinyl acetate or an acrylic resin containing vinyl acetate. The paper tube according to any one item. The paper tube according to any one of claims 1 to 7, wherein a metal plate or glass paper is inserted between the non-combustible sheets to be laminated. The paper tube according to any one of claims 1 to 8, wherein a plurality of composite base materials having a metal plate or glass paper interposed between the two non-combustible sheets are laminated. When the nonflammability of the paper tube was determined according to the cone calorie combustion test based on ISO5660-1 and the total calorific value with respect to time and the heat generation rate with respect to time were determined, (i) 20 minutes after the start of heating. The total calorific value is 8 MJ / m ² or less, (ii) 20 minutes after the start of heating, the maximum heat generation rate does not exceed 200 kW / m ² continuously for 10 seconds or more, and (iii) 20 minutes after the start of heating. The paper tube according to any one of claims 1 to 9, wherein the paper tube has a nonflammable property that satisfies the absence of cracks and holes penetrating from the outside to the inside, which are harmful to fire protection.

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