JP4119930B2 - Madler paper - Google Patents

Description

  The present invention relates to a mudler paper used for a mudler used when adding milk, sugar, or the like to coffee, tea, or the like and stirring, and a mudler using the same.

  Conventionally, a mudler is used for adding sugar and milk and stirring when drinking coffee or tea in a train or the like. Such a mudler is used to stir hot coffee, tea, iced coffee, or the like, and therefore is required to have excellent water resistance and hot water resistance. Usually, for example, as shown in Patent Document 1 A plastic stick-shaped mudler is used.

  However, due to the recent increase in environmental awareness, as an alternative material for tableware such as plastic mudlers and spoons, for example, as shown in Patent Document 2, based on paper material, (1) synthetic fiber is mixed with pulp And (2) a synthetic resin coated or impregnated, and (3) a synthetic resin film laminated on one or both sides.

  However, such a paper material mudler is one in which a paper base material is impregnated with a synthetic resin or a synthetic resin film is laminated. For this reason, from the viewpoint of more severe recent environmental problems and manufacturing costs, there is a demand for a paper mudler that can be manufactured at low cost using only paper materials and has improved water resistance and heat resistance.

  Therefore, as shown in, for example, Patent Document 3, even a mudler formed using paper made only of paper material, the mudler does not feel stale due to water absorption of hot water, In addition, within the normal use time of the mudler, the mudler is not colored by coffee or other colors, and it can be manufactured at a low cost, and unlike the plastic mudler, it can be incinerated. For this reason, environmentally friendly mudler paper has been proposed.

  In addition, as shown in, for example, Patent Document 4, the present applicant has proposed tableware paper that has improved water resistance and hot water resistance using only paper materials, and tableware such as a stick for stirring and a spoon using the tableware paper. did.

Compared to the conventional molders made using impregnated types and synthetic resin films, the mudler formed using these papers is easy to absorb water, especially when used for hot beverages. For this reason, it is easy to lose the rigidity required for this purpose, and it is a fact that further improvement is demanded as a paper mudler that can be used particularly for hot beverages.
JP 09-276111 A JP 2003-79505 A JP 2004-321671 A JP 2006-168283 A

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a mudler paper and a mudler that have improved water resistance and hot water resistance.

The above object of the present invention, at least the surface layer, backing layer, and an intermediate layer disposed between said surface layer and said backing layer, a basis weight of 700~1000g / ^{m 2,} a density from 0.83 to 0 .90 g / cm ³ of Madler paper, containing 0.05 to 2% by mass of sizing agent in terms of solid content with respect to raw pulp, and 0.3 to 2 in terms of solid content of polyacrylamide with respect to raw material pulp 0.7 % by mass, the longitudinal Taber stiffness measured in accordance with JIS-P8125 is 150 mN · m or more, and the longitudinal Taber stiffness measured in accordance with JIS-P8125 and the lateral Taber stiffness ratio (longitudinal Taber stiffness / lateral Taber stiffness) is from 2.55 to 2.70, and is at 80 ° C. hot water per minute immersed longitudinal Taber stiffness is 75 mN · m or more after further , Kobusaizu measured at measurement time of 120 seconds according to the Cobb method of JIS-P8140 is achieved by providing a muddler paper, which is a 21~40g / ^{m 2.}

The mudler paper according to the present invention has at least a surface layer, a back layer, and an intermediate layer disposed between the surface layer and the back layer, and has a basis weight of 700 to 1000 g / m ² and a density of 0.83. 0.90 g / cm ³ , the longitudinal Taber stiffness measured according to JIS-P8125 is 150 mN · m or more, and the longitudinal Taber stiffness after being immersed in warm water at 80 ° C. for 1 minute is 75 mN · m. As described above, even when a drink such as hot coffee with high temperature is agitated with a mudler formed using this paper, there is no feeling of flapping.

In addition, the sizing degree measured at 120 seconds using hot water at 80 ° C. according to the Cobb method of JIS-P8140 was set to 25 to 50 g / m ² , so that even a high temperature beverage can absorb the beverage. It can suppress the nature, and the feeling of knocking on the mudler is less likely to occur.

  Further, since the sizing agent is contained in the raw material pulp in an amount of 0.05 to 2% by mass in terms of solid content and the polyacrylamide is contained in the raw material pulp in terms of the solid content of 0.3 to 2.7% by mass, the paper The stiffness of the coffee can be increased, and even if a drink such as hot coffee having a high temperature is stirred with a mudler formed using this paper and the hot drink is absorbed, there is little decrease in rigidity.

  In addition, since the ratio of the longitudinal Taber stiffness and the lateral Taber stiffness (longitudinal Taber stiffness / lateral Taber stiffness) measured according to JIS-P8125 was set to 2.00-2.90, Necessary longitudinal rigidity can be efficiently obtained, and absorption of hot water from the side surface (cross section) of the Madler can be efficiently suppressed. As a result, it is possible to efficiently obtain a Madler paper that is excellent in rigidity and can suppress absorptivity even with a high-temperature beverage and has little reduction in rigidity.

  Furthermore, a mudler formed using the above-described mudler paper can improve water resistance and hot water resistance as compared with a conventional paper mudler made only of paper material.

  Hereinafter, the Madler paper according to the present invention will be described in detail with reference to the drawings, taking as an example the case of a back layer, three intermediate layers, and a front layer of five paper layers. It should be noted that the mudler paper according to the present invention is not limited to the following embodiments, and it is needless to say that the configuration can be changed as appropriate without departing from the scope of the claims.

  As shown in a schematic cross-sectional view in FIG. 1, a mudler paper (hereinafter referred to as “main paper”) 10 according to the present invention includes a back layer 11, an intermediate layer 12, an intermediate layer 13, an intermediate layer 14, and a surface layer 15. It is composed of five paper layers.

  Each layer of the paper 10 is formed using pulp as a main raw material. Examples of the main pulp include hardwood bleached kraft pulp (LBKP), softwood bleached kraft pulp (NBKP), hardwood unbleached kraft pulp (LUKP), softwood unbleached kraft pulp (NUKP), and hardwood semi-bleached kraft pulp ( LSBKP), softwood semi-bleached kraft pulp (NSBKP), hardwood sulfite pulp, softwood sulfite pulp and other chemical pulp, Stone Grand Pulp (SGP), Pressurized Stone Grand Pulp (PGW), Refiner Grand Pulp (RGP), Thermo Grand Pulp (TGP), Chemi-Grand Pulp (CGP), Crushed Wood Pulp (GP), Thermomechanical Pulp (TMP), etc. Mechanical Pulp, Tea Waste Paper, Craft Envelope Waste Paper, Magazine Waste Paper, Newspaper Waste Paper, Flyer Waste Paper, Office Waste Paper, Corrugated Waste Paper, Old white paper, old Kent paper Chemically or mechanically from disaggregated waste paper pulp, disaggregated / deinked waste paper pulp, or disaggregated / deinked / bleached waste paper pulp produced from imitation waste paper, old paper, etc., or non-wood fibers such as kenaf, hemp, and straw Various well-known pulps such as manufactured pulp can be used in appropriate combination.

  However, since the present paper 10 is mainly used for a mudler, the present paper 10 directly touches beverages such as coffee and tea. For this reason, it is preferable that the pulp used for this paper 10 is a chemical pulp, and above all, it is more preferable to use ECF (Elemental Chlorine Free) pulp or TCF (Total Chlorine Free) pulp.

ECF pulp is a chlorine-free bleached chemical pulp produced by bleaching with chlorine dioxide (ClO ₂ ) without using molecular chlorine (Cl ₂ ). That is, since ECF pulp has a low content of chlorine ions, there is an advantage that there is little risk of formation of organic chlorine compounds such as dioxins even by low-temperature incineration, and as a result, the environmental load is small.

  Further, it is preferable that the present paper 10 contains as much waste paper pulp as possible within a range that does not impair the functions of rigidity and size and does not affect the function as a Madler paper. When a large amount of waste paper pulp is blended, it is possible to reduce the load on the energy intensity and the environment, and it is advantageous in terms of cost. As the used paper pulp, it is preferable to use deinked / bleached used paper pulp produced from high-quality used paper such as leaflet used paper, office used paper, upper white used paper, Kent used paper, and imitation used paper among the used paper pulp described above.

  However, when waste paper pulp is blended, mechanical pulp derived from waste paper pulp is contained, but the content of this mechanical pulp is preferably less than 10% by mass. When content of mechanical pulp exceeds 10 mass%, the size property and rigidity with respect to warm water will fall.

  Moreover, although this paper 10 can be used combining suitably various well-known pulp, it is preferable to contain 25-70 mass% of NKP (conifer craft pulp), and to contain 30-60 mass%. More preferred.

  When the content of NKP is less than 25% by mass, it is difficult to obtain rigidity as a mudler. On the other hand, if the content of NKP exceeds 70% by mass, the fiber length is too long and the number of rigid pulp fibers is too large, so that the paper texture is deteriorated and the fiber orientation described later is difficult to adjust. It is difficult to obtain rigidity as. Moreover, since the surface area of a fiber becomes small and the yield of a sizing agent worsens, it becomes difficult to obtain the sizing degree desired by the present invention. For this reason, it is necessary to increase the addition amount of the sizing agent, thereby causing the paper machine to become dirty, resulting in a decrease in production efficiency, an increase in chemical cost, and an increase in manufacturing cost.

  The freeness of the raw pulp is preferably 300 to 500 cc, more preferably 350 to 450 cc. When the freeness is less than 300 cc, the pulp fiber length becomes too short, the rigidity of the obtained paper is lowered, the dewaterability in the paper machine is deteriorated, and the adjustment of the pulp fiber orientation becomes difficult. On the other hand, when the freeness exceeds 500 cc, the fibrillation of the pulp fibers is small and the entanglement between the pulp fibers is reduced, so that the rigidity of the obtained paper is reduced and the adjustment of the orientation of the pulp fibers in the paper machine can be adjusted. It becomes difficult.

  In this specification, “freeness (cc)” means a Canadian standard freeness tester according to JIS-P8121, after the sample is disaggregated with a standard disintegrator according to JIS-P8220. The freeness value measured in (1) (hereinafter the same), and can be confirmed as follows.

That is, the obtained paper is cut into a size of about 3 cm ² to obtain a test piece having a weight of about 25 g. The test piece is immersed in 1 liter of water for 24 hours, and then standardized in accordance with JIS-P8220. It is a value measured with a Canadian standard freeness tester in accordance with JIS-P8121 after confirming that the test piece is completely disaggregated by disaggregation for 15 minutes with a disaggregator.

The total basis weight of the paper 10 is 700 to 1000 g / m ² , preferably 750 to 900 g / m ² . When the basis weight is less than 700 g / m ² , desired rigidity cannot be obtained. On the other hand, if the basis weight exceeds 1000 g / m ² , the desired rigidity can be easily obtained, but the manufacturing cost is increased, and it is not preferable from the viewpoint of environmental problems and resource saving.

A paper having a high basis weight of 700 to 1000 g / m ² as in the present paper 10 has a very large amount of pulp fibers in a certain area, and the pulp fibers are superimposed on the pulp fibers many times. Therefore, the orientation of the pulp fibers of such a high basis weight paper can no longer be adjusted by a paper machine with single-layer papermaking.

Therefore, it is preferable that the application amount of each layer is 75 to 300 g / m ² . Thereby, as will be described later, the pulp fiber orientation (Taber stiffness ratio) can be efficiently adjusted within a certain range, and the paper 10 can be obtained efficiently.

The applied amount (g / m ² ) is the basis weight of each of the back layer 11, the intermediate layers 12 to 14, and the surface layer 15, and the obtained paper is peeled off, and the “paper” described in JIS-P8124 And paperboard-basis weight measuring method ".

  The delamination is performed according to the following procedure. First, the test piece obtained from the paper 10 is immersed in water at room temperature for about 1 hour. A test piece immersed in water is wound around a round bar of about 10 mmΦ starting from a corner, and then the round bar is rolled to squeeze the test piece. This operation is repeated starting from all four corners of the test piece, and ironing force is applied to the test piece from each direction. Thereby, a part of the layers of the test piece is peeled off, and this is used to separate the back layer 11, the intermediate layers 12 to 14, and the surface layer 15 to perform layer peeling. After delamination, each layer of the test piece is sufficiently dried with a hot air dryer or the like, and then the basis weight of each layer is measured according to “paper and paperboard—basis weight measurement method” described in JIS-P8124. can do.

The present sheet 10 is preferably set to 0.83~0.90g / cm ³ density. Thereby, water absorption and rigidity can be obtained efficiently with good balance. That is, water absorption when applied to a hot beverage can be suppressed, and even when the hot beverage is stirred to absorb the hot beverage, there is little reduction in stiffness and the occurrence of a crumbly feeling can be reduced.

In addition, if the density is less than 0.83 g / cm ³ , the rigidity is likely to be lowered, and a feeling of knocking is likely to occur. On the other hand, if the density exceeds 0.90 g / cm ³ , the water absorption can be further suppressed, but the paper thickness decreases and the rigidity decreases.

  Since this paper 10 is a paper mainly used for a mudler, the fiber orientation is completely different from that of general paper such as newsprint paper, copy paper, flyer paper, book paper, and cardboard liner. is there.

  That is, the above-mentioned general paper is made from pulp fibers in the vertical direction (paper machine flow direction) and the horizontal direction (paper machine flow direction) as much as possible from the viewpoint of curling problems, appearance, texture problems, printability problems, and the like. Disperse uniformly in the width direction). However, the present paper 10 adjusts the pulp fiber in the longitudinal direction (paper machine flow direction) within a certain range, and obtains rigidity and size characteristics as a mudler.

  Specifically, the ratio of longitudinal Taber stiffness to lateral Taber stiffness (longitudinal Taber stiffness / lateral Taber stiffness) is preferably 2.00 to 2.90, and preferably 2.55 to 2.55. More preferably 2.70. By setting the ratio of the Taber stiffness to 2.00 to 2.90, it is possible to suppress the absorption of hot water from the side surface of the Madler (sheet cross section). In other words, the absorption of hot water is suppressed by adjusting the pulp fiber orientation so that the side surface in the longitudinal direction of the Madler, which has a large cross-sectional area, and the alignment of the pulp fibers are substantially parallel, and reducing the gap in the longitudinal direction of the Madler. The water resistance and hot water resistance of the mudler can be improved. In addition, the adjustment of the ratio of the Taber stiffness in the present paper 10 can be efficiently adjusted by adjusting the basis weight and the amount of each layer to be within a certain range as described above.

  When the ratio of the Taber stiffness is less than 2.00, the stiffness as a mudler may be insufficient, and it is necessary to take inefficient measures such as increasing the basis weight. On the other hand, if the ratio of the Taber stiffness exceeds 2.90, the pulp fiber orientation must be adjusted excessively with a paper machine, resulting in a decrease in production efficiency.

The Taber stiffness in the present invention is not generally determined by the effects of the type, ratio, basis weight, amount of each layer applied, drainage, density, fiber orientation, etc. of the raw pulp used, but as described above, NKP Of 30 to 60% by mass, freeness of 300 to 500 cc, basis weight of 700 to 1000 g / m ² , weight of each layer of 75 to 300 g / m ² , longitudinal Taber stiffness and lateral direction It is an example of a preferred embodiment that the ratio to the Taber stiffness is adjusted so that the ratio of the Taber stiffness in the vertical direction / Taber stiffness in the lateral direction is 2.00 to 2.90.

Further, this paper 10 has a Cobb sizing degree of 21 to 40 g / m ² measured by a Cobb method based on JIS-P8140 at a measurement time of 120 seconds, and is measured using hot water at 80 ° C. by a Cobb method based on JIS-P8140. The sizing degree measured for 120 seconds (hereinafter referred to as “warm water sizing degree”) is 25 to 50 g / m ² , preferably 30 to 40 g / m ² . By adjusting the degree of sizing to a certain range and adjusting the pulp fiber orientation as described above, the mudler formed using this paper 10 can absorb the hot beverage from the side surface. It can be suppressed more.

If the degree of hump sizing is less than 21 g / m ² , it becomes necessary to add an excessive amount of a sizing agent, resulting in paper machine stains, which lead to product defects, resulting in a reduction in product quality and production efficiency. On the other hand, when it exceeds 40 g / m ² , the rigidity is likely to be lowered, and a feeling of knocking easily occurs. In addition, when the hot water sizing degree is less than 25 g / m ² , the paper machine is contaminated due to the excessive addition of the sizing agent, which causes a product defect, resulting in a reduction in product quality and production efficiency. On the other hand, if it exceeds 50 g / m ² , the rigidity tends to be lowered, and a knocking feeling tends to occur.

  Further, the present paper 10 contains a sizing agent in an amount of 0.05 to 2% by mass in terms of solid content with respect to the raw material pulp. As a result, even if the paper 10 is put on a hot beverage at about 80 ° C. and stirred, its rigidity hardly decreases within a certain time. That is, the hot beverage is hardly absorbed from the front surface, the back surface, and the side surface of the present paper 10, and even if it is absorbed, there is little decrease in stiffness.

  When the content of the sizing agent is less than 0.05% by mass, the sizing property necessary for the present paper 10 cannot be obtained. On the other hand, even if the sizing agent content exceeds 2.0% by mass, the effect of improving the sizing property will reach its peak, and the yield of the added sizing agent will decrease, resulting in dirt and foaming in the paper machine system. However, the operability is reduced.

  As such a sizing agent, it is preferable to use a rosin sizing agent or a neutral rosin sizing agent. Specific examples of rosin sizing agent and neutral rosin sizing agent include sizing agent AL series, CC series, FR series / Starlight PMC, size pine E series, GF series, N series, NT series / Arakawa There are chemical industries.

In general, the size test is performed using distilled water at 23 ° C. In the test of the degree of cobb sizing prescribed in JIS, synthetic size system, rosin system, neutral rosin system, alkyl ketene dimer (AKD) system, alkenyl Using any known sizing agent such as succinic acid (ASA), styrene, styrene / acrylic, olefin, petroleum resin, fatty acid, wax, etc. The degree can be 21 to 40 g / m ² .

  However, since the present paper 10 is mainly used for a mudler, it is important that the rigidity of the paper hardly decreases within a certain period of time even if it is stirred in a hot beverage having a high temperature of about 80 ° C.

  Therefore, in the present invention, it is preferable to use a rosin sizing agent or a neutral rosin sizing agent. When a rosin sizing agent or a neutral rosin sizing agent is used, both the degree of sizing and warm water are within the desired ranges, and there is almost no change in water absorption (degree of non-absorption of water). Even if a certain degree of bump size is obtained with this water, the water absorption is greatly reduced with warm water, making it easy to absorb. The reason is not clear, but the hydrophobic group possessed by the AKD or ASA sizing agent is weak against heat, and the hydrophobicity is likely to be lowered by heat.

  Further, the present paper 10 contains polyacrylamide as a paper strength enhancer in an amount of 0.3 to 2.7% by mass, preferably 0.5 to 1.7% by mass in terms of solid content with respect to the raw material pulp. .

  When the content of the paper strength enhancer is less than 0.3% by mass, it is difficult to obtain a desired Taber stiffness, and excessive adjustment is imposed on the adjustment of the raw material pulp and the papermaking method. On the other hand, even if it exceeds 2.7% by mass, the rigidity improvement effect will reach its peak, and the yield of the added paper strength enhancer will decrease, causing dirt and foaming in the paper machine system, resulting in reduced operability. To do.

  As such a paper strength enhancer, various known materials such as polyacrylamide resins, polyamide resins, polyamine resins, acrylic resins, melamine resins, urea resins, polyamide epichlorohydrin resins can be used. Among these, in the present invention, it is particularly preferable to use an anionic strength enhancer and a cationic strength enhancer in combination with excellent heat resistance, and further, an anionic strength enhancer, a cationic strength enhancer, and a wet It is more preferable to use a paper strength enhancer in combination because it is excellent in heat resistance and hot water resistance.

  Specifically, examples of anionic paper strength enhancers include DA series / Starlight PMC, Polystron 117, 191, 194 series / Arakawa Chemical Industries, and examples of cationic paper strength enhancers include Polystron 311, 619, 705. Series / Arakawa Chemical Industries. Examples of the wet paper strength enhancer include WS series / Starlight PMC, Arafix 100 series / Arakawa Chemical Industries.

  Such a combination of paper strength enhancing agents is an example of an embodiment in which the stiffness of the paper sheet 10 is increased, and even when the paper sheet 10 absorbs a hot beverage, the decrease in stiffness is reduced.

  The present paper 10 is manufactured by papermaking the raw materials of each layer satisfying the above-described configuration in a state of being laminated by a paper machine.

  The papermaking method is not particularly limited, and any of an acidic papermaking method, a neutral papermaking method, and an alkaline papermaking method may be used. Also, the paper machine is not particularly limited, and various known paper machines such as a long net paper machine, a twin wire paper machine, a circular net paper machine, and a short net combination machine can be used. .

  In addition, in order to further improve the size of the paper 10 for hot beverages, and since the paper 10 may be printed, in order to improve printing gloss and surface strength, or to adjust the slipperiness, If necessary, it is preferable to apply a coating liquid mainly composed of a water-soluble substance on the surface of the paper 10.

  Examples of such water-soluble substances include polyacrylamide and derivatives thereof, polyvinyl alcohol, cellulose derivatives, starch, modified starch, polystyrene-butadiene-based, acrylic-based, polyvinyl acetate-based latex, wax emulsion, and the like in this field. Various known materials that are usually used can be used alone or in admixture of two or more.

  Furthermore, it is preferable to coat the water-soluble substance with a surface sizing agent such as styrene, styrene / acrylic or olefin. Specifically, SS series / starlight PMC, SE series / starlight PMC, and the like are suitable as the surface sizing agent.

The ratio between the water-soluble substance and the surface sizing agent is 10: 5 to 10: 0.01 as a solid content, and 0.2 to 3.5 g / m ² , preferably 0.5 to ² g / m ² on both sides of the paper surface. It is preferable to apply m ^{2 in view} of sizing properties for hot beverages, printing suitability for printing, and operability at the time of manufacturing the present paper 10.

  Further, the surface of the paper 10 may be smoothed. The smoothing process is preferably performed by, for example, pressing the sheet 10 between rolls that can be pressed. When performing the smoothing treatment, the roll in contact with the surface of the surface layer 15 of the paper 10 is preferably a metal roll that has a smooth surface and can be heated.

  The smoothing process on the paper 10 is a process of making the paper 10 in addition to the above smoothing process, for example, a calendar process using a calendar roll having one or more pairs of metal rolls (by machine calendar). Calendar processing), calendar processing with a calendar roll provided with one or a plurality of metal rolls and resin rolls (calendar processing with a soft calendar), drying processing with a Yankee dryer, and the like.

  The paper 10 may contain starch, fillers, antifoaming agents, dyes, anti-slip agents, PH adjusting agents and the like in addition to the sizing agent and paper strength enhancer described above.

  The case where the paper layer is composed of the five paper layers of the back layer 11, the intermediate layers 12 to 14, and the surface layer 15 has been described above for the present paper 10, but the present invention is not limited to such a paper, for example, The number of intermediate layers may be increased or decreased to have four, six, seven,... Paper layers.

  In order to confirm the effect of the Madler paper according to the present invention, the following various samples were prepared, and a test for evaluating the quality of each sample was performed. In addition, in a present Example, the numerical value which shows a mixing | blending, a density | concentration, etc. is a numerical value based on the weight of a solid content or an active ingredient. Moreover, since the pulp, chemical | medical agent, etc. which are shown in a present Example are only examples, it cannot be overemphasized that this invention is not restrict | limited by these Examples, and can be selected suitably.

  For comparison with 20 types of Madler papers (referred to as “Example 1” to “Example 20”) according to the present invention and these Examples 1 to 20, seven types of Madler papers ( This was referred to as “Comparative Example 1” through “Comparative Example 7”), and was prepared with the configuration shown in Table 1. The manufacturing conditions are shown below. Unless otherwise specified, the raw material composition, freeness, chemical addition conditions, and the like of the surface layer, middle layer (three layers), and back layer are the same.

［実施例１］
ＮＢＫＰ３５質量％、ＬＢＫＰ６５質量％を混合した原料を濾水度調整し、硫酸バンド１５ｋｇ／ｔ、アニオン性紙力増強剤０．５質量％（ハリマ化成株式会社製／ハーマイドＢ−１５）、カチオン性紙力増強剤０．２質量％（ハリマ化成株式会社製／ハリフィックスＵＦ−５７０）、湿潤紙力増強剤０．２０質量％（星光ＰＭＣ株式会社製／湿潤紙力剤ＷＳ４００２）、サイズ剤０．５質量％（星光ＰＭＣ株式会社製／ＡＬ１２０）を添加し原料スラリーを調整した。

[Example 1]
The raw material mixed with 35% by mass of NBKP and 65% by mass of LBKP was adjusted for freeness, and the sulfuric acid band was 15 kg / t, the anionic paper strength enhancer was 0.5% by mass (Harima Kasei Co., Ltd./Harmide B-15), cationic Paper strength enhancer 0.2% by mass (Harima Chemical Co., Ltd./Harifix UF-570), wet paper strength enhancer 0.20% by mass (Seiko PMC Co., Ltd./wet paper strength agent WS4002), sizing agent 0 .5 mass% (Seiko PMC Co., Ltd./AL120) was added to prepare a raw material slurry.

Using these raw slurry at round net multilayer paper machine, the surface layer, the combined paper making five-layer structure of the intermediate (3-layer) and the back layer, the basis weight of each layer surface 130 g / m ^2, an intermediate layer 540 g / m ² (each 180 g / m ² ), the back layer 130 g / m ² , and the total basis weight 800 g / m ² .

Furthermore, on both sides of the paper surface, PVA (manufactured by Nippon Synthetic Chemical Co., Ltd., Gohsenol N300) and a coating solution having a surface sizing agent solid content ratio of 10: 1 are coated so that the coating amount is 1.0 g / m ² per side. To make a Madler paper (Example 1).

  [Examples 2 to 5] Madler paper obtained in the same manner as in Example 1 except that the basis weight was adjusted to the values shown in Table 1.

  [Examples 6 to 9] Madler paper obtained in the same manner as in Example 1 except that the sizing agent content was adjusted to the values shown in Table 1.

  [Examples 10 to 12] Madler paper obtained in the same manner as in Example 1 except that the paper strength enhancer was adjusted to the values shown in Table 1.

[Examples 14 - 15] to adjust the fiber orientation at the time of papermaking, muddler sheet is the ratio of Taber stiffness points other except that it has changed as shown in Table 2 were obtained in the same manner as in Example 1.

  [Examples 17 to 20] Madler paper obtained in the same manner as in Example 1 except that the raw material composition was changed as shown in Table 1.

  [Comparative Example 1] A Madler paper obtained in the same manner as in Example 1 except that the basis weight was changed as shown in Table 1.

  [Comparative Examples 2-3] Madler paper obtained in the same manner as in Example 1 except that the density was changed as shown in Table 1.

  [Comparative Example 4] A Madler paper obtained in the same manner as in Example 1 except that the content of the sizing agent was changed as shown in Table 1.

  [Comparative Example 5] A Madler paper obtained in the same manner as in Example 1 except that the content of the paper strength enhancer was changed as shown in Table 1.

  [Comparative Example 7] A commercially available general cardboard exterior liner.

In addition, “basis weight (g / m ² )” in Table 1 is the basis weight of all layers of each sample, that is, the entire Madler paper, and is described in “paper and paperboard—basis weight measuring method” described in JIS-P8142. It is a value measured in compliance.

“Density (g / cm ³ )” means the basis weight measured according to “Paper and paperboard—basis weight measuring method” described in JIS-P8142, and “paper and paperboard—thickness” described in JIS-P8118. It is a value calculated from the thickness measured according to the “Test method for thickness and density”.

  Table 2 shows the results of measuring the sizing degree, hot water sizing degree, Taber stiffness, and hot water Taber stiffness for all these Examples and Comparative Examples, and the results of evaluating the stiffness and papermaking operability. Met.

“Size (g / m ² )” is a measurement condition of a contact time of 120 seconds and a test water temperature of 23 ± 1 ° C. according to JIS-P8140 “Paper and paperboard—Water absorption test method—Cobb method”. It is the value measured by.

“Hot water sizing degree (g / m ² )” is a measurement of a contact time of 120 seconds and a test water temperature of 80 ± 1 ° C. in accordance with JIS-P8140 “Paper and paperboard—Water absorption test method—Cobb method”. It is a value measured under conditions.

  “Taber stiffness (mN · m)” is a value in the longitudinal direction (flow direction) of a sample measured in accordance with “Paper and paperboard—Stiffness test method—Taber stiffness tester method” described in JIS-P8125. The value in the transverse direction and the ratio are the ratio of the Taber stiffness in the longitudinal direction (flow direction of the paper machine) / the Taber stiffness in the lateral direction (width direction of the paper machine).

  “Hot water Taber stiffness (mN · m)” means that the test piece is immersed in warm water (80 ± 1 ° C.) for 1 minute, and then the paper is lightly pinched with filter paper to remove the adhering water, and then described in JIS-P8125 It is the value in the longitudinal direction (flow direction) of the sample, measured according to “paper and paperboard—stiffness test method—Taber stiffness tester method”.

  “Rigidity” is the rigidity after stirring, and after the mudler produced by cutting each sample obtained in this example and comparative example was immersed in hot coffee at about 80 ° C. for 30 seconds, This is the result of having 10 men and 10 women evaluate the stiffness after hot coffee is stirred 10 times with the mudler. In addition, the evaluation criteria are “No difference with plastic mudler” marked with ◎, “No problem with knocking after stirring for 1 minute”, “No problem with knocking”, and “No madness” ”.

  The “papermaking operability” is an evaluation of papermaking aptitude such as paper machine dirt, presence / absence of defects, texture, and ease of profile control during papermaking. The evaluation criteria were three levels: “Excellent” marked with ◎, “Adjustable and adaptable” marked with ○, and “Poor” marked with ×.

表２に示すように、本発明に係るマドラー用紙、すなわち実施例１〜実施例２０に係るマドラー用紙によれば、品質評価に優れ、優れた耐熱性、耐熱水性を有し、剛度に優れることが分かる。

As shown in Table 2, the mudler paper according to the present invention, that is, the mudler paper according to Examples 1 to 20, has excellent quality evaluation, excellent heat resistance, hot water resistance, and excellent rigidity. I understand.

It is a schematic sectional drawing of the Madler paper concerning this invention.

Explanation of symbols

10 Madler paper 11 according to the present invention Back layer 12, 13, 14 Intermediate layer 15 Surface layer

Claims (1)

A mudler having at least a surface layer, a back layer, and an intermediate layer disposed between the surface layer and the back layer, having a basis weight of 700 to 1000 g / m ² and a density of 0.83 to 0.90 g / cm ³ . Paper,
The sizing agent is included in the raw material pulp in an amount of 0.05 to 2% by mass in terms of solid content, and the polyacrylamide is included in the raw material pulp in an amount of solid content of 0.3 to 2.7% by mass,
The longitudinal taber stiffness measured in accordance with JIS-P8125 is 150 mN · m or more, and the ratio of the longitudinal taber stiffness measured in accordance with JIS-P8125 to the lateral Taber stiffness (longitudinal taber stiffness) / Taber stiffness in the transverse direction) is 2.55 to 2.70, and the Taber stiffness in the longitudinal direction after being immersed in warm water at 80 ° C. for 1 minute is 75 mN · m or more,
Furthermore, Muddler paper Kobusaizu measured at measurement time of 120 seconds according to the Cobb method of JIS-P8140 is characterized in that it is a 21~40g / ^{m 2.}

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