JP2005272608A - Stain-preventing agent for impregnation roll and method for preventing impregnation roll from being stained - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stain-preventing agent for an impregnation roll and a method for preventing an impregnation roll from being stained, wherein the stain of an impregnation roll in a process for producing impregnated paper, in particular the stain by a synthetic resin emulsion can be effectively prevented, and can improve the productivity without deteriorating the quality of the impregnated paper. <P>SOLUTION: The method comprises spraying a stain-preventing agent for an impregnation roll, which is obtained by adding 0.01-0.5 pts.wt. of a polyvinylpyrolidone and/or a vinyl acetate-vinylpyrolidone copolymer to 100 pts.wt. of water, onto a surface of an impregnation roll in a process for producing impregnated paper. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an impregnating roll stain preventing agent and an impregnating roll stain preventing method in an impregnated paper manufacturing process using the same.

In recent years, various chemicals have been impregnated into paper in order to enhance the functions of paper products or to add new functions. For example, an impregnating liquid composition for enhancing the water resistance of paper is impregnated.
On the other hand, when impregnating the impregnating liquid composition having a strong film property, a film of the impregnating liquid composition is formed on the surface of the impregnating roll, and the accumulation of the film loses the smoothness of the surface of the impregnating roll, resulting in impregnation unevenness. Or the wrinkles are transferred to the paper and have a serious adverse effect on the quality of the impregnated paper.

  The biggest cause of impregnation roll stains is the synthetic resin emulsion used in the impregnating liquid composition. As a means for solving these problems, the stickiness of the synthetic resin emulsion has been vigorously improved, and the synthetic resin emulsion Modifications or various internal additives have been reported. However, although these methods improve roll stains, they have drawbacks such as a reduction in product quality and the need for a large amount of internal additives.

Therefore, a method for cleaning the roll has been studied, and Patent Document 1 discloses various paper-making papers containing a halogenated glycol, a quaternary ammonium compound, a copolymer of N-vinylpyrrolidone and dialkylaminoalkyl acrylate, or the like as an active ingredient. A liquid detergent for rolls is disclosed. However, it is difficult to say that these cleaning agents are particularly sufficient for preventing soiling of impregnating rolls using synthetic resin emulsions. Patent Document 2 reports a method of cleaning a laminate roll with a cleaning cloth impregnated with acetone. However, since an organic solvent is used, deterioration of the environment is inevitable.
JP-A-8-325974, JP-A-2001-181999, JP-T-2001-511836 JP 2002-127249 A

  INDUSTRIAL APPLICABILITY The present invention provides an impregnated roll stain preventing agent and an impregnated roll stain preventing method capable of effectively preventing impregnated roll stains caused by a synthetic resin emulsion in the impregnated paper manufacturing process and improving productivity without degrading the quality of the impregnated paper. It is an issue to provide.

As a result of repeated studies to solve such problems, the present inventor has found that polyvinylpyrrolidone or a vinyl acetate / pyrrolidone copolymer is effective, and has completed the present invention.
That is, the present invention
(1) An impregnating roll antifouling agent containing polyvinylpyrrolidone and / or vinyl acetate / vinylpyrrolidone copolymer,
(2) Impregnation roll soil according to (1) above, wherein polyvinylpyrrolidone and / or vinyl acetate / vinylpyrrolidone copolymer is added in an amount of 0.01 to 0.5 parts by weight with respect to 100 parts by weight of water. Inhibitor,
(3) A method for preventing soiling of impregnated rolls in an impregnated paper manufacturing process, wherein polyvinylpyrrolidone and / or vinyl acetate / vinylpyrrolidone copolymer is added to water and sprayed on the surface of the impregnated roll,
(4) The impregnated paper manufacturing process according to (3), wherein the addition amount of polyvinylpyrrolidone and / or vinyl acetate / vinylpyrrolidone copolymer is 0.01 to 0.5 parts by weight with respect to 100 parts by weight of water. Impregnation roll dirt prevention method in,
Is to provide.

  The impregnation roll antifouling agent and antifouling method of the present invention can effectively prevent the impregnation roll from being contaminated in the impregnated paper manufacturing process, and as a result, impregnation unevenness and wrinkles can be prevented. Therefore, the quality of the impregnated paper is not deteriorated, and the impregnating roll is not required to be washed while the impregnation machine is stopped, so that the productivity of the impregnated paper can be improved. Further, a desired effect can be obtained with a small addition amount, which is advantageous in terms of cost.

Hereinafter, the present invention will be described in detail.
In the present invention, polyvinylpyrrolidone or vinyl acetate / vinylpyrrolidone copolymer is used as an active ingredient.
Polyvinyl pyrrolidone is a homopolymer of vinyl pyrrolidone, and the average molecular weight is not particularly limited, but usually about 10,000 to 500,000 is sufficient.

The vinyl acetate / vinyl pyrrolidone copolymer is not particularly limited as long as it is generally commercially available, but has a molecular weight of 100,000 or less, vinyl acetate: vinyl pyrrolidone (molar ratio) = 30 to 70:70 to 30. Those are preferred.
The structure of the copolymer is not particularly limited, but a random copolymer having a linear structure or a copolymer in which vinyl acetate and vinylpyrrolidone are alternately bonded is preferable because of excellent dispersion stability.
Among these active ingredients, vinyl acetate / vinyl pyrrolidone copolymer is more preferable because it has a strong antifouling action.

The polyvinyl pyrrolidone or vinyl acetate / vinyl pyrrolidone copolymer is desirably added to water and used in an amount of 0.01 to 0.5 parts by weight, preferably 0.05 to 100 parts by weight of water. -0.2 weight part is desirable.
If the amount added is less than 0.01 parts by weight, the effect of preventing soiling is small, so a large amount of aqueous solution must be sprayed onto the roll, causing dew drop to the base paper, while adding over 0.5 parts by weight. Then, the quality of the impregnated paper may be deteriorated, which is not preferable from the viewpoint of economy.

In the present invention, there is provided a method for preventing soiling of an impregnating roll by adding polyvinylpyrrolidone or a vinyl acetate / vinylpyrrolidone copolymer to water (hereinafter simply referred to as an aqueous copolymer solution) and spraying the impregnating roll.
The aqueous copolymer solution is sprayed onto the impregnating roll by one-fluid spray or two-fluid spray.

The number of sprays, the spray nozzle, the distance to the roll, and the like are arbitrarily adjusted so that the spray is uniformly sprayed over the entire width of the impregnating roll. In particular, in the width direction of the roll, it is necessary to determine the interval between the sprays so that a portion that is not sprayed does not occur.
The amount of spraying is arbitrarily adjusted depending on the composition of the impregnating liquid, the temperature, the impregnation speed, etc. For example, when a two-fluid spray is installed at a distance of 250 mm to the roll at a roll φ of 245 mm, the impregnation speed is 100 m / min or less. Adjustment can be made within a range of 5 m / L to 40 m / L per nozzle.

The present invention is not limited to impregnating rolls, but also has the same effect on places where roll dirt is generated by the impregnating liquid composition, for example, roll dirt such as paper rolls and expander rolls that come into contact with paper before the impregnating liquid is dried. Play.
The impregnating liquid composition that is an object of the present invention is not particularly limited as long as it is impregnated into paper products, but a synthetic resin emulsion is particularly preferable. If it is a synthetic resin emulsion, it is cationic, anionic or amphoteric. It may be.

EXAMPLES Hereinafter, although an Example demonstrates this invention, this invention is not limited by these Examples.
Example 1
Vinyl acetate / vinyl pyrrolidone copolymer (manufactured by BASF, trade name: Rubytec VA64W, molecular weight 60,000, vinyl acetate: vinyl pyrrolidone (molar ratio) = 40: 60) with water so that the active ingredient is 1 g / L. It diluted and it was set as the impregnation roll stain | pollution | contamination inhibitor of this invention.

Example 2
A vinyl acetate / vinyl pyrrolidone copolymer (manufactured by BASF, trade name: Rubytec VA64W) was diluted with water so as to be 100 mg / L as an active ingredient, and used as an impregnating roll antifouling agent of the present invention.

Example 3
A polyvinyl pyrrolidone polymer (manufactured by BASF, trade name: Rubytec K30, molecular weight 40,000) was diluted with water so as to be 1 g / L as an active ingredient, and used as an impregnating roll antifouling agent of the present invention.

Comparative Example 1
Polyoxyethylene styrenated phenyl ether (product of Kao, trade name: Emulgen A-60, a surfactant having a wetting effect) was diluted with water so as to be 1 g / L as an active ingredient to prepare a solution.

Examples 4-6, Comparative Examples 2-4
The following composition was prepared as an impregnation liquid composition.
(Impregnating liquid composition)
10 parts by weight of a cationic soap-free acrylic emulsion (manufactured by DIC, trade name: Boncoat SFC-556) was diluted to 80 parts by weight of water.

The roll is driven by immersing about 20% of the roll diameter so that the above impregnating liquid composition filled in the pan can always be supplied to the lower roll of the test impregnator that can be driven by niping two rolls. It was rotated at a speed of 17 m / min.
The aqueous solutions obtained in Examples 1 to 3 and Comparative Example 1 were each sprayed continuously at 10 ml / min on the upper roll (φ130 mm) of the impregnation machine by two-fluid spray. Spraying was started, and the time when the dirt on the upper roll due to the film of the impregnating liquid composition became 50% of the roll surface area was measured.
The obtained results are shown in Table 1.
In Table 1, Comparative Example 3 is a spray of only water, and Comparative Example 4 is a spray of nothing.

Example 7
In the impregnated paper manufacturing process, seven two-fluid sprays were arranged at a distance of 250 mm from the impregnation roll (φ245 mm) at a pitch of 200 mm in the width direction, and the aqueous solution of Example 1 was continuously sprayed at 20 L / min per nozzle. . For 36 hours from the start of the test, the impregnating roll was hardly contaminated, and there was no need to clean the roll during the production. Also, the quality of the obtained impregnated paper was good.

  On the other hand, after 8 hours in the case of spraying with water alone, or 2.5 hours after no spraying, the impregnating rolls with the impregnating composition become more dirty. went.

  As described above, according to the present invention, the impregnation roll can be effectively prevented from being contaminated, and therefore, it can be suitably used particularly in the impregnated paper manufacturing process.

Claims (4)

  An impregnation roll antifouling agent containing polyvinylpyrrolidone and / or vinyl acetate / vinylpyrrolidone copolymer.   The impregnating roll stain preventing agent according to claim 1, wherein the polyvinylpyrrolidone and / or vinyl acetate / vinylpyrrolidone copolymer is added in an amount of 0.01 to 0.5 parts by weight with respect to 100 parts by weight of water.   A method for preventing impregnation roll soiling in an impregnated paper manufacturing process, wherein polyvinylpyrrolidone and / or vinyl acetate / vinylpyrrolidone copolymer is added to water and sprayed onto the surface of the impregnation roll.   The impregnation roll soil in the impregnated paper manufacturing process according to claim 3, wherein the addition amount of polyvinylpyrrolidone and / or vinyl acetate / vinylpyrrolidone copolymer is 0.01 to 0.5 parts by weight with respect to 100 parts by weight of water. Prevention method.