JP2009191428A - Method for producing printing paper and printing paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing printing paper, which a good size effect is obtained, and to provide a printing paper. <P>SOLUTION: The method for producing the printing paper includes priming raw paper using wood pulp as a main material with a surface-treating agent containing a sizing agent, and then top-coating the primed raw material with a surface-treating agent containing a surface-sizing agent. In addition, in the method for producing the printing paper, the sizing agent and the surface-sizing agent are aluminum sulfate and an anionic surface-sizing agent, respectively, and especially wherein the raw material is made without acid. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

Detailed Description of the Invention

  The present invention relates to a printing paper, and more particularly to a method for producing a printing paper having a high degree of size and a neutral papermaking.

  In the paper industry, in order to improve various problems such as paper aging, low whiteness, and low opacity in acidic papermaking, the paper industry also uses cheaper fillers than talc, kaolin, titanium dioxide, etc. used in acidic papermaking. Conversion from acidic papermaking has been promoted for the purpose of enabling use and reducing paper manufacturing costs, and at present, neutral papermaking and alkaline papermaking are widely used. Representative examples of the internally added sizing agent for neutral papermaking include alkyl ketene dimer (hereinafter referred to as AKD), alkenyl succinic anhydride (hereinafter referred to as ASA), and neutral rosin sizing agent. It is common to use one type of neutral sizing agent selected from these. However, each of these neutral sizing agents has problems.

  In the case of AKD, there is often an operational problem that papermaking tools such as press rolls, smoother rolls, and felts of a paper machine are easily soiled. Further, the paper sized by AKD has a problem that the size effect is slow and the size changes with time, so that it is difficult to manage the size of the paper. Also, paper sized with AKD has a low coefficient of friction, and troubles due to paper slipping may occur during processing and use such as printing and cutting of paper.

  In the case of ASA, there is an advantage that the friction coefficient of the paper is not lowered and the rise of the sizing degree is quick. However, since ASA is easily hydrolyzed and the hydrolyzate has no size development effect, there is a problem that ASA must be emulsified immediately before being added to the stock. Further, there is a problem that dirt caused by the ASA hydrolyzate easily adheres to the paper machine and causes more operational problems than in the case of AKD.

  In view of these circumstances, rosin-based emulsion sizing agents (hereinafter referred to as neutral rosin sizing agents) that can be used in the neutral range have been proposed in recent years. However, in the case of a neutral rosin sizing agent, when calcium carbonate is included as a filler, the pH in the papermaking system becomes an alkaline region, causing a reduction in the yield of the sizing agent. If not properly controlled, a stable sizing degree cannot be obtained. In addition, since the size performance is low, it is necessary to increase the addition rate of the sizing agent, and there is a problem that the sizing cost is increased.

  As described above, each neutral sizing agent has its own problems. In addition, when the blending ratio of fillers such as calcium carbonate is increased in neutral paper or alkaline paper, these internally added neutral sizing agents have a size. There exists a problem that an effect will fall remarkably. For this reason, with paper such as printing paper that requires a high sizing degree, it has been difficult to impart the desired sizing degree to the paper only with the internal addition of a neutral sizing agent.

  In order to solve the above-described problem of the neutral sizing agent, attempts have been made to improve the neutral sizing method.

  As a conventional technology, there is a combined technology of a neutral sizing agent and other chemical substances. As the chemical substances used in combination, cationized starch, cationic polyacrylamide, amphoteric polyacrylamide, polyamine-epichlorohydrin resin, polyamine polyamide-epichlorohydrin resin and so on. Further, as a recent technology, for example, with the object of effectively exerting the size effect of a neutral sizing agent, AKD, ASA, a copolymer of a cationic monomer and a hydrophobic monomer, a cationized petroleum resin, a cation A method of sizing using one or two or more neutral sizing agents selected from the group consisting of functionalized fatty acid amides and chitosan is disclosed (Patent Document 1). In addition, in the papermaking system using a neutral sizing agent, a neutrality consisting of at least one selected from AKD, ASA, and rosin ester sizing agent is provided for the purpose of providing a method for producing paper with reduced generation of stains. A method is disclosed in which a sizing agent and a styrenic cationic polymer are added to a pulp slurry and paper is produced to produce paper (Patent Document 2). In addition, in neutral papermaking or alkaline papermaking, it is a technical subject to provide a paper having excellent size effect in combination with reactive sizing agents such as AKD and ASA, and the combined substances include rosins, reinforced rosins, rosin esters. In the presence of a rosin resin selected from the group consisting of reinforced rosin esters, styrene is copolymerized with an aminoalkyl ester of (meth) acrylic acid and cationized with a quaternizing agent or acid. A bonded cationic polymer is disclosed (Patent Document 3).

  With the technology that uses the neutral sizing agent and other chemical substances in combination as described above, it is still possible to obtain a sufficiently satisfactory sizing effect because the fixing rate of the neutral sizing agent to the pulp cannot be sufficiently improved. Has not reached.

  Furthermore, as a technique for mixing a sizing agent, for example, in a stencil for ketene dimer papermaking comprising a disperse phase containing a ketene dimer and an aqueous continuous phase containing a dispersant, the disperse phase is a mixture of a ketene dimer and a rosin ester. A ketene dimer-based paper sizing agent having a weight ratio of ketene dimer / rosin ester = 96/4 to 40/60 is disclosed (Patent Document 4). In addition, for the purpose of providing a sizing agent that has a good rise in sizing degree, excellent size performance, easy setting of papermaking conditions, and does not stain the papermaking machine, a rosin system containing at least one of rosin esters and reinforced products thereof A method for producing a neutral papermaking sizing agent obtained by mixing an aqueous dispersion containing a substance and an aqueous dispersion containing AKD, a sizing agent, a sizing method using the same, and sizing paper are disclosed. It is also disclosed that the weight ratio of rosin-based substance to AKD is rosin-based substance / AKD = 99/1 to 65/35 (Patent Document 5). However, even with these techniques, it has been difficult to economically achieve a satisfactory size.

Japanese Patent No. 2571919 JP 2001-32191 A JP 2001-73293 A Japanese Examined Patent Publication No.59-051637 Japanese Patent Laid-Open No. 7-229083

Problems to be solved by the invention

  It is an object of the present invention to provide a printing paper manufacturing method and a printing paper that can obtain a good size effect without causing operational troubles such as machine contamination.

Means for solving the problem

In order to solve the above problems, the present invention has the following configuration.
(1) A method for producing a printing paper, comprising: applying a surface treatment agent containing a size fixing agent to a base paper mainly composed of wood pulp, followed by overcoating the surface treatment agent containing a surface sizing agent.
(2) The method for producing a printing paper as described in (1), wherein the size fixing agent is aluminum sulfate and the surface sizing agent is an anionic surface sizing agent.
(3) The method for producing a printing paper according to (1) or (2), wherein the base paper is neutral papermaking.
(4) A printing paper obtained by the production method according to any one of (1) to (3).

The paper machine used in the present invention uses a paper machine comprising a wire part, a press part, a first drying part, a coating part, a second drying part, and a calendar part.
As the wire portion, a gap former, a hybrid former, an on-top former or the like having a double-side dewatering mechanism is desirable, but not limited thereto. The press part can be any of straight through type, invar type, reverse type, or any combination. Twin bar + 3P type, trinip + 4P type, tiger event + 4P type, bi-nip press, etc. Those used in general paper machines can be used, and as a dewatering method, a conventional method such as a suction roll method or a grooved press method can be used, and a shoe press can also be used. As the drying unit, methods such as a steam heater, a gas heater, an infrared heater, an electric heater, a hot air heater, a microwave, and a cylinder dryer are used. As a coating part, apparatuses, such as a 2 roll size press, a metal ring size press, a gate roll coater, a bar coater, a blade coater, are used. As the calendar unit, commonly used calendar devices such as a chilled calendar, a super calendar, a soft calendar, and a gloss calendar can be used.

The pulp used in the base paper of the present invention includes chemical pulp such as softwood bleached kraft pulp (NBKP) and hardwood bleached kraft pulp (LBKP), groundwood pulp (GP), thermomechanical pulp (TMP), refiner groundwood pulp ( RGP) and the like, and waste paper pulp. These are mixed and used depending on the purpose.
As the filler used in the present invention, calcium carbonate, kaolin, clay, talc, titanium oxide, hydrated silicic acid and the like can be used alone or in combination.

As the internally added chemical, an internally added sizing agent, a size fixing agent, a paper strength enhancing agent, a yield improving agent and the like can be used. As the internal sizing agent, rosin sizing agent, AKD, ASA and the like, styrene acrylic resin, styrene maleic acid resin and the like can be used alone or in combination. As the size fixing agent, it is preferable to use aluminum sulfate. As a size fixing agent other than aluminum sulfate, cationized starch, polyacrylamide and the like can be used alone or in combination. Furthermore, as paper strength enhancers and yield improvers, known materials such as starch, carboxymethyl cellulose (CMC), polyvinyl alcohol (PVA), polyacrylamide (PAM), melamine resin, urea resin, polyethyleneimine can be used alone or in combination. .
In the present invention, in order to improve the storage stability of the paper, it is preferable that the paper is made neutral so that the pH of the base paper is 6-8.

In the present invention, a paper machine comprising a wire part, a press part, a first drying part, a coating part, a second drying part, and a calendar part is used, and the surface of the base paper that has passed through the wire part and the press part is subjected to at least an undercoat and an overcoat. Apply the surface treatment twice. At this time, both undercoating and overcoating can be performed in the coating unit, or undercoating can be performed before the first drying unit or in the middle of the first drying unit, and overcoating can be performed in the coating unit.
The base paper is coated with a surface treatment agent containing a size fixing agent. As the size fixing agent, aluminum sulfate, cationized starch, polyacrylamide or the like can be used alone or in combination. As the composition used in combination with the size fixing agent, a release agent, a viscosity modifier, a preservative and the like can be applied.

After the undercoat is applied, a surface treatment agent containing a surface sizing agent is overcoated. As a surface sizing agent, a styrene acrylic acid resin, a styrene methacrylic acid resin, a styrene maleic acid resin, an olefin maleic acid resin, or the like can be used alone or in combination as a surface sizing agent. As the composition used in combination with the surface sizing agent, oxidized starch, various modified starches, polyvinyl alcohol, polyacrylimide and the like can be applied.
Here, the combination of the size fixing agent and the surface sizing agent can be arbitrarily set, but the size fixing agent for the undercoat is preferably aluminum sulfate, and the surface sizing agent for the top coat is preferably an anionic surface sizing agent. Aluminum sulfate is inexpensive and easy to dilute, so that it has good handling and workability as a surface treatment agent and is suitable as a size fixing agent used in the present invention. In addition, the use of an anionic surface sizing agent produces a good size effect. Furthermore, since the size fixing agent is externally added, even when the raw material contains a large amount of calcium carbonate, the size fixing agent is not deactivated by calcium carbonate, and the size effect of the internal sizing agent and the surface sizing agent is reduced. Works effectively in expression.

  When applying the surface treatment agent, a device such as a two-roll size press, a gate roll coater, a bar coater, a blade coater, or a spray coating device is used. When the undercoat size fixing agent is aluminum sulfate, it is preferable to use a spray coating device because the undercoat surface treatment agent has a low viscosity.

In the present invention, since a size fixing agent is externally added, a reduction in size due to a quality change of used paper, which is a problem when a size fixing agent is internally added, an excessive addition of chemicals to cope with it, Dirt can be prevented. In addition, the surface sizing agent can be well fixed and the size effect can be enhanced.
Furthermore, since the size fixing agent and the surface sizing agent are not mixed and applied separately to the base paper, there is no trouble of forming an aggregate even if a size fixing agent and a surface sizing agent having different ionic properties are used. .

In the present invention, it is desirable that the base paper is smoothed by a calendar device after the surface sizing agent is applied and dried. As such a calendar device, commonly used calendar devices such as a chilled calendar, a super calendar, a soft calendar, and a gloss calendar can be used.
As described above, the printing paper manufacturing method of the present invention is obtained.

Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples. In the following, parts and% are by weight unless otherwise specified. The paper machine used in the examples and comparative examples is a gap former type wire part, a tra event + 4P type press part, a first drying part (pre-dryer), a coating part (gate roll coater), and a second drying part. (After-dryer) and soft calendar.
(Example 1) Waste paper deinked pulp (DIP, Canadian standard freeness 200 ml CSF) 70 parts by weight and thermomechanical pulp (TMP, Canadian standard freeness 90 ml CSF) 30 parts by weight are used as pulp raw materials. In contrast, rosin emulsion sizing agent (trade name: CC-1404, manufactured by Seiko PMC) is 0.3%, cationic paper strength agent (trade name: CATO304, manufactured by NSC Japan) is 0.1%, aluminum sulfate (Alumina conversion concentration 8% product: solid, made in-house) 2% was added, and white carbon was added 1.5% (made in-house) as a filler to make paper. After applying 1% (total on both sides) of aluminum sulfate (alumina equivalent 8% concentration: solid, in-house manufactured) using a spray coating device in the middle of the first drying section, oxidized starch (trade name) on a gate roll coater : Oji Ace A, manufactured by Oji Cornstarch Co., Ltd.) application amount 0.6 g / m ² (both sides total), anionic styrenic surface sizing agent (trade name: Polymaron NS-25, manufactured by Arakawa Chemical Industries) 0.04 g / m ² (total on both sides) to produce a printing paper having a basis weight of 43.0 g / m ² . Table 1 shows the measurement results of the pH of white water at the time of manufacture and the size of the obtained printing paper.

Example 2 Printing paper was prepared in the same manner as in Example 1 except that 85 parts by weight of DIP (Canadian standard freeness of 200 ml CSF) and 15 parts by weight of TMP (Canadian standard freeness of 90 ml CSF) were mixed as pulp raw materials. Obtained.

(Example 3) Addition amount of rosin emulsion sizing agent (trade name: CC-1404, manufactured by Seiko PMC) was 0.15%, and oxidized starch (trade name: Oji Ace A, manufactured by Oji Cornstarch Co., Ltd.) with a gate roll coater. ) 1.0 g / m ² (total on both sides), anionic styrenic surface sizing agent (trade name: Polymaron NS-25, Arakawa Chemical Industries) 0.06 g / m ² (total on both sides) A printing paper was obtained in the same manner as in Example 1.

(Example 4) A printing paper was prepared in the same manner as in Example 1 except that the surface sizing agent applied by the gate roll coater was changed to an anionic olefin type surface sizing agent (trade name: Polymeron OM-25, manufactured by Arakawa Chemical Industries). Obtained.

(Example 5) A printing paper was obtained in the same manner as in Example 1 except that the sizing agent added to the pulp raw material was changed to an AKD sizing agent (trade name: AD-1624, manufactured by Seiko PMC).

(Comparative Example 1) 70 parts by weight of waste newspaper deinked pulp (DIP, Canadian standard freeness 200 ml CSF) and 30 parts by weight of thermomechanical pulp (TMP, Canadian standard freeness 90 ml CSF) are used as pulp raw materials. In contrast, rosin emulsion sizing agent (trade name: CC-1404, manufactured by Seiko PMC) is 0.3%, cationic paper strength agent (trade name: CATO304, manufactured by NSC Japan) is 0.1%, aluminum sulfate (Alumina conversion concentration 8% product: solid, made in-house) 2% was added, and white carbon was added 1.5% (made in-house) as a filler to make paper. Aluminum sulfate (8% concentration in terms of alumina: solid, in-house manufactured) is not applied, and oxidized starch (trade name: Oji Ace A, manufactured by Oji Cornstarch) is applied with a gate roll coater 0.6 g / m ² ( 2 side total), anionic styrenic surface sizing agent (trade name: Polymaron NS-25, Arakawa Chemical Industries) applied at 0.04 g / m ² (both sides total), printing with basis weight A3.0 g / m ² Paper was manufactured. Table 2 shows the measurement results of the pH of white water at the time of production and the size of the obtained printing paper.

(Comparative Example 2) A printing paper was prepared in the same manner as in Comparative Example 1 except that 85 parts by weight of DIP (Canadian standard freeness of 200 ml CSF) and 15 parts by weight of TMP (Canadian standard freeness of 90 ml CSF) were mixed as pulp raw materials. Obtained.

(Comparative example 3) Addition amount of rosin emulsion sizing agent (trade name: CC-1404, manufactured by Seiko PMC) is 0.15%, and oxidized starch (trade name: Oji Ace A, manufactured by Oji Cornstarch Co., Ltd.) with a gate roll coater. ) Coating amount of 1.0 g / m ² (both sides total), anionic styrenic surface sizing agent (trade name: Polymaron NS-25, manufactured by Arakawa Chemical Industries) is 0.06 g / m ² (both sides total) A printing paper was obtained in the same manner as in Comparative Example 1 except that.

(Comparative Example 4) A printing paper was prepared in the same manner as in Comparative Example 1 except that the surface sizing agent applied by the gate roll coater was changed to an anionic olefin surface sizing agent (trade name: POLYMALON OM-25, manufactured by Arakawa Chemical Industries). Obtained.

(Comparative Example 5) A printing paper was obtained in the same manner as in Comparative Example 1 except that the sizing agent added to the pulp raw material was changed to an AKD sizing agent (trade name: AD-1624, manufactured by Seiko PMC).

(Comparative Example 6) A printing paper was obtained in the same manner as in Comparative Example 1 except that the surface sizing agent applied by the gate roll coater was a cationic styrene surface sizing agent (trade name: Polymeron 360, manufactured by Arakawa Chemical Industries).

(Comparative Example 7) A cationic styrene surface sizing agent (trade name: Polymaron 360, manufactured by Arakawa Chemical Industries) applied with a gate roll coater, and the coating amount was 0.07 g / m ² (both sides total). A printing paper was obtained in the same manner as in Comparative Example 1.

Tables 1 and 2 show the measurement results regarding the printing paper obtained in Examples 1 to 5 and Comparative Examples 1 to 7.
In addition, sizing degree is based on JAPAN TAPPI paper pulp test method No. In accordance with 32-2: 2000 “Paper—Water Absorption Test Method—Part 2: Drop Method”, the water absorption test with 5 μl of the amount of dripped water is performed twice each on the front and back sides, and the average value of the time required for water absorption. However, as a pretreatment of the test piece, it was measured by curing at 105 ° C. for 20 minutes with a hot air dryer and then adjusting the humidity at 23 ° C. and 50%.

In Example 1, 1% aluminum sulfate was applied as a size fixer for the undercoat, and the total amount of chemical used was the same as that in Comparative Example 1, but the sizing degree was 64 seconds. It is higher than 45 seconds.
In Example 2 and Comparative Example 2, as compared with Example 1 and Comparative Example 1, respectively, the amount of deinked waste paper pulp is large, and it is a condition that makes it difficult to express the size. At this time, the undercoated Example 2 has a higher sizing degree and a better size development than the Comparative Example 2.
Example 3 and Comparative Example 3 were covered by increasing the surface sizing agent in order to maintain the size effect when the internally added sizing agent was reduced as compared with Example 1 and Comparative Example 1, respectively. In Example 3, the degree of size is higher than that of Comparative Example 3, and the size expression is good.
In Example 4 and Comparative Example 4, an anionic olefin type surface sizing agent was used as compared with Example 1 and Comparative Example 1, respectively, but even in this case, Example 4 was higher in size than Comparative Example 4 and had a larger size. Expression is good.
In Example 5 and Comparative Example 5, an AKD sizing agent was used as an internally added sizing agent in comparison with Example 1 and Comparative Example 1, respectively. Expression is good.
In Comparative Example 6, the same amount of the cationic styrenic surface sizing agent was applied as compared with Example 1, but the degree of sizing was low and the size development was not good.
Compared to Example 1, Comparative Example 7 was coated with a larger amount of cationic styrene surface sizing agent, resulting in higher chemical costs, but lower in size expression than in Example 1.

The invention's effect

  According to the present invention, even for printing paper using a lot of neutral papermaking and waste paper pulp, a printing paper manufacturing method that can obtain a good size effect without causing operational troubles such as machine stains of the paper machine, and Printing paper can be provided.

Claims (4)

  A method for producing a printing paper, comprising: applying a surface treatment agent containing a size fixing agent to a base paper mainly composed of wood pulp, followed by overcoating a surface treatment agent containing a surface sizing agent.   2. The method for producing a printing paper according to claim 1, wherein the size fixing agent is aluminum sulfate and the surface sizing agent is an anionic surface sizing agent.   The method for producing a printing paper according to claim 1 or 2, wherein the base paper is neutral papermaking.   The printing paper obtained by the manufacturing method in any one of Claims 1-3.