JP6393997B2 - Manufacturing method of sanitary thin paper products - Google Patents

Description

  The present invention relates to sanitary thin paper products such as tissue paper and toilet paper, and a method for producing the same. More specifically, the present invention relates to a multi-ply sanitary thin paper product in which a plurality of thin papers are overlaid and a method for manufacturing the same.

  Conventionally, sanitary thin paper products such as tissue paper have been manufactured by producing a thin paper by making a paper material containing hardwood pulp or softwood pulp, and processing the thin paper. Techniques for producing sanitary thin paper products by such paper making processes and processing processes are disclosed in, for example, Patent Documents 1 to 3.

  Specifically, the papermaking process of the stock is generally divided into a wire part, a press part, a dryer part, and a reel part. In the wire part, a slurry-like stock containing a lot of moisture is poured onto a mesh member (wire) to obtain wet paper from which moisture has been removed to some extent. In the press part, moisture is absorbed from the wet paper by pressing both sides of the wet paper with the felt member. In the dryer part, the wet paper is heated to evaporate the water to obtain a thin paper having a water content of about 10% by weight or less. In this dryer part, a dryer called a Yankee dryer is generally used. The Yankee dryer is a roller-shaped device, and its peripheral surface is formed as a mirror surface and is heated. In addition, a hood is provided around the Yankee dryer, and hot air is sent from the hood to the Yankee dryer. For this reason, when the wet paper containing moisture is pressed on the peripheral surface of the Yankee dryer, the moisture can be evaporated from the wet paper and dried. Thereafter, the thin paper is wound up by the reel part to form a raw roll.

  In the thin paper processing process, the thin paper is fed out from the raw roll obtained in the above paper making process, and various processing is performed according to the type and application of the sanitary thin paper product. For example, in the processing step, there is a rewind part in which thin paper is fed out from a plurality of original fabric rolls, and a plurality of thin papers are overlapped and rewound again. The rewind part manufactures a raw roll with multiple thin papers overlapped, and based on this raw roll, the thin paper is cut into the product width or cut into the product length. Sanitary tissue paper products can be obtained. In addition, the process of folding and packaging a plurality of sets of sanitary thin paper products is also performed in this processing step.

JP 2003-027389 A JP 2009-263844 A JP 2013-094238 A

  By the way, as described in Patent Documents 1 to 3, the conventional sanitary thin paper product has a surface (YD surface) in contact with the Yankee dryer on the outer side when a plurality of thin papers are overlaid. It is supposed to be superimposed so that it faces the user's hand). That is, as described above, the peripheral surface of the Yankee dryer has a mirror finish. For this reason, the YD surface of the thin paper that is in contact with the Yankee dryer is formed more quickly than the hood surface (FD surface) facing the hood, so the YD surface is directed outward. Therefore, it was thought that the feel of sanitary thin paper products would be good.

  However, the present inventor has found a problem that when sanitary thin paper products are manufactured with the YD surfaces of the thin papers facing outward, paper dust is likely to be scattered from the sanitary thin paper products. For example, if the sanitary tissue paper product is a tissue paper sold in a box, if the YD side is facing outward, when the user removes the tissue paper from the packaging box, a lot of paper dust will come out of the tissue paper. It turned out to be scattered. For this reason, as in the past, sanitary thin paper products with the YD surface facing outwards have a problem that the texture and appearance of the sanitary thin paper products are dull, but a lot of paper dust is easily scattered.

  Then, this invention makes it a solution subject to provide the technique for reducing the quantity of the paper dust scattered from a sanitary thin paper product at least.

  The inventor of the present invention has intensively studied the means for solving the above problems, and as a result, the paper that is unexpectedly scattered from the sanitary thin paper product by overlapping a plurality of thin papers so that the YD surface of the thin paper faces inward. It has been found that the amount of powder can be reduced. The inventor has conceived that the problems of the prior art can be solved based on the above knowledge, and has completed the present invention. More specifically, the present invention has the following configuration.

The first aspect of the present invention relates to a sanitary thin paper product.
The sanitary thin paper product of the present invention is obtained by superposing a plurality of thin papers made by making a paper stock containing pulp contact with a Yankee dryer and drying it.
In the present invention, each thin paper has a surface (YD surface) in contact with the Yankee dryer. In the sanitary thin paper product of the present invention, the two thin paper sheets located on the outermost side are overlapped with the YD surface facing inward.

  As described above, the amount of paper powder scattered from the sanitary thin paper product can be reduced by superimposing the YD surface of the thin paper inwardly. According to the research of the present inventor, when wet paper containing moisture is pressed against a Yankee dryer and dried, the bond between pulps is broken on the YD surface of the wet paper in contact with the dryer by the heat of the dryer. Therefore, it is thought that a lot of fine paper dust is generated. For this reason, when a sanitary thin paper product is manufactured with the YD surface facing outward, it is considered that the fine paper powder adhering to the YD surface is scattered when the product is used. In this respect, in the sanitary thin paper product of the present invention, since the YD surface of the thin paper is overlapped inward, it becomes difficult for the paper dust adhering to the YD surface to be scattered even when the product is used. Yes. As a result, according to the present invention, paper dust scattered from sanitary thin paper products can be reduced.

  In the sanitary thin paper product of the present invention, it is preferable that at least one of the two outermost thin paper sheets is coated with a humectant on the hood surface (FD surface) opposite to the YD surface.

  According to the said structure, the touch of a sanitary thin paper product can be improved, reducing the quantity of the paper powder scattered from a sanitary thin paper product. That is, as described above, the YD surface of the thin paper is brighter than the FD surface. For this reason, in conventional sanitary thin paper products, the YD surface of the thin paper faces outward. On the other hand, the present invention dares to face the YD surface of the thin paper inward for the purpose of reducing the amount of paper dust scattered from the sanitary thin paper product. However, although the sanitary thin paper product of the present invention succeeded in reducing the amount of scattered paper dust, there is a risk that the touch will be impaired. Therefore, as described above, by applying a moisturizing agent to the FD surface of the thin paper that faces outward, the amount of paper dust scattered from the sanitary thin paper product is reduced, and the hand of the sanitary thin paper product is impaired. Can also be prevented. As described above, in the preferred embodiment of the present invention, the YD surface of the thin paper is dared to face inward, and the moisturizing agent is applied to the opposite FD surface, which contradicts the reduction of the amount of scattered paper dust and the improvement of the touch. The objectives can be achieved at the same time.

  In the sanitary thin paper product of the present invention, a moisturizing agent may be applied to the YD surface of at least one of the two outermost thin paper sheets.

  According to the above configuration, the YD surface of the thin paper is directed inward, and the moisturizing agent is further applied to the YD surface. In this way, by applying a moisturizer to the inwardly facing YD surface, the amount of paper dust scattered from the sanitary thin paper product can be reduced compared to when no moisturizer is applied or when a humectant is applied to the FD surface. Further, it can be effectively reduced. That is, by applying a moisturizing agent to the YD surface, the moisturizing agent suppresses the scattering of the paper dust, so that the amount of paper dust scattering can be significantly reduced.

The second aspect of the present invention relates to a method for producing sanitary thin paper products.
In the production method of the present invention, first, paper is prepared by contacting a paper stock containing pulp with a Yankee dryer and drying it to obtain a thin paper having a surface YD in contact with the Yankee dryer. Thereafter, a plurality of thin papers are stacked.
Here, in the process of superimposing thin papers, the two thin papers located on the outermost sides are superposed with the YD surface facing inward.

  As in the above process, the amount of paper powder scattered from the sanitary thin paper product can be reduced by superposing the YD surface of the thin paper inwardly.

  In the manufacturing method of the present invention, a moisturizing agent is applied to the hood surface (FD surface) opposite to the YD surface of at least one of the two outermost thin paper sheets before the step of overlapping the thin paper sheets. Is preferred.

  As in the above process, while the YD surface of the thin paper is dared to face inward, a contradictory purpose of reducing the amount of paper dust and improving the touch is simultaneously achieved by applying a moisturizing agent to the opposite FD surface. be able to.

  According to the present invention, the amount of paper dust scattered from sanitary thin paper products can be reduced.

FIG. 1 is a process diagram showing a first embodiment of a manufacturing method according to the present invention. FIG. 2 is a process diagram showing a second embodiment of the manufacturing method according to the present invention. FIG. 3 is a perspective view schematically showing a sanitary thin paper product according to the present invention.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below, but includes those appropriately modified by those skilled in the art from the following embodiments.

  FIG. 1 shows a part of a process for obtaining a sanitary thin paper product in which a plurality of thin papers are superposed. In particular, the process shown in FIG. 1 shows a rewind part in which the first thin paper 1 and the second thin paper 2 are overlapped.

  As shown in FIG. 1, first, a first original roll 10 around which a long first thin paper 1 is wound and a second original roll 20 around which a long second thin paper 2 is wound are prepared. .

  The process of making a paper stock to obtain a raw roll is known. Specifically, the papermaking process of the stock is generally divided into a wire part, a press part, a dryer part, and a reel part. In the wire part, a slurry-like stock containing a lot of moisture is poured onto a mesh member (wire) to obtain wet paper from which moisture has been removed to some extent. In the press part, moisture is absorbed from the wet paper by pressing both sides of the wet paper with the felt member. In the dryer part, the wet paper is heated to evaporate the water to obtain a thin paper having a water content of about 10% by weight or less. In this dryer part, a dryer called a Yankee dryer is generally used. The Yankee dryer is a roller-shaped device, and its peripheral surface is formed as a mirror surface and is heated. In addition, a hood is provided around the Yankee dryer, and hot air is sent from the hood to the Yankee dryer. For this reason, when the wet paper containing moisture is pressed on the peripheral surface of the Yankee dryer, the moisture can be evaporated from the wet paper and dried. Thereafter, the thin paper is wound up by the reel part to form a raw roll.

  As shown in FIG. 1, the first thin paper 1 and the second thin paper 2 fed out from the first original roll 10 and the second original roll 20 are respectively a Yankee surface (YD surface) and a hood surface (FD surface). have. The “YD surface” is the surface of the above-described dryer part that is in contact with the Yankee dryer. The “FD surface” is a surface on the side opposite to YD, and is a surface on the side facing the hood in the above-described dryer part.

  As shown in FIG. 1, after the first thin paper 1 and the second thin paper 2 are pulled by the original rolls 10, 20 by being pulled by the pinch rollers 30, and stacked on each other by the laminating rollers 50. Finally, the film is taken up by the take-up roller 60. Here, the first thin paper 1 and the second thin paper 2 are superposed in the laminating roller 50 so that the respective YD surfaces are on the inside. That is, since the YD surface of the first thin paper 1 and the YD surface of the second thin paper 2 can be brought into contact with each other and overlapped, The direction in which the first thin paper 1 and the second thin paper 2 are pulled out is adjusted. As a result, the YD surface of the first thin paper 1 and the YD surface of the second thin paper 2 face inward in the laminated body that is finally wound by the take-up roller 60, and the FD surface of the first thin paper 1 and the second thin paper 2 The FD surface is facing outward.

  As described above, the amount of paper dust scattered from the sanitary thin paper product can be reduced by daringly superposing the YD surfaces of the first thin paper 1 and the second thin paper 2 inward. According to the study of the present inventor, the amount of paper dust scattered from the sanitary thin paper product is compared with the case where the YD surfaces of the first thin paper 1 and the second thin paper 2 are overlapped inward as compared with the case of being overlapped outward. It has been found that it can be reduced by about 10-30%. That is, it is considered that the YD surface in contact with the Yankee dryer breaks the bond between the pulps due to the heat from the dryer, and a large amount of fine paper dust is generated. For this reason, when a sanitary thin paper product is manufactured with the YD surface facing outward, it is considered that the fine paper powder adhering to the YD surface is scattered when the product is used. In this respect, in the present invention, since the YD surfaces of the thin paper are overlapped inward, it is difficult to scatter the paper powder adhering to the YD surface even when the product is used. As a result, according to the present invention, paper dust scattered from sanitary thin paper products can be reduced.

  Further, as shown in FIG. 1, in this embodiment, before the first thin paper 1 and the second thin paper 2 are overlapped, a humectant is applied to the FD surface of each thin paper 1, 2 by the coater 40. As the coater 40, a known device having a function of applying a humectant can be appropriately employed. For example, as the coater 40, a nozzle sprayer, a rotor spray, or a transfer roller can be employed. Moreover, as the moisturizing agent applied by the coater 40, various liquids used in general moisturizing paper can be used. Examples of humectants include polyhydric alcohols such as glycerin, diglycerin, propylene glycol, 1.3-butylene glycol, and polyethylene glycol; sugars such as sorbitol, glucose, xylitol, maltose, maltitol, mannitol, and trehalose; It is possible to use a liquid (may be a solution) containing one or two or more components in a system drug and derivatives thereof; higher alcohols such as cetanol, stearyl alcohol, and oleyl alcohol; liquid paraffin and the like. Also. It is preferable that the application amount of the humectant is, for example, 2 to 30% by mass, 3 to 25% by mass, or 4 to 20% by mass in the entire mass of the sanitary thin paper product that is the final product.

  As in the embodiment shown in FIG. 1, by applying a moisturizing agent to the FD surfaces of the thin papers 1 and 2, the amount of paper powder scattered from the sanitary thin paper products is reduced and the hand of the sanitary thin paper products is improved. Can be Thus, while reducing the amount of paper dust scattered from the sanitary thin paper product by applying the moisturizing agent to the opposite FD surface while inwardly facing the YD surface of each thin paper 1, 2, and It becomes possible to improve the touch of sanitary thin paper products.

  Here, FIG. 2 shows a form different from the embodiment shown in FIG. In the embodiment of FIG. 2, unlike the embodiment of FIG. 1, before the first thin paper 1 and the second thin paper 2 are overlapped, a moisturizing agent is applied to the YD surface of each thin paper 1, 2 by the coater 40. It is said. In this way, the YD surface of each thin paper 1 and 2 is facing inward, and a moisturizer is further applied to the YD surface, so that no moisturizer is applied or a humectant is applied to the FD surface. Thus, the amount of paper dust scattered from sanitary thin paper products can be further reduced. That is, by applying a moisturizing agent to the YD surface, the moisturizing agent suppresses the generation of paper dust, so that the amount of paper dust scattered is significantly reduced.

  The embodiment shown in FIG. 1 and the embodiment shown in FIG. 2 can adopt a preferable one as appropriate according to the use of the sanitary thin paper product. For example, in order to achieve both reduction in the amount of paper dust generated and good touch, the embodiment of FIG. 1 may be adopted. On the other hand, when emphasizing the reduction in the amount of paper dust generated while sacrificing the touch to some extent, the embodiment of FIG. 2 may be adopted.

  1 and 2, the first roll 1 and the second roll 2 are rewound (rewinded) and then processed into tissue paper or toilet paper by a known processing device. The

  For example, when manufacturing tissue paper from a raw fabric roll, first, the raw fabric roll is cut to form a plurality of rolls, and each roll is arranged in the number of sets of products. For example, when 200 sets of tissue paper are stored in a single packaging box (tissue box), 200 rolls are arranged. A bundle of base paper is formed by folding the base paper while pulling it out from a plurality of rolls arranged in groups. Each bundle of base paper is cut into product lengths. Thereby, a bundle of tissue paper is formed from the bundle of base paper. After that, each bundle of tissue paper can be packed in a packaging box (tissue box).

  In addition, when manufacturing toilet paper from an original roll, the base paper is fed out from the original roll and wound around a cylindrical core. When the base paper wound around the core reaches the product length, the base paper is separated from the raw roll. Thereby, a log is formed. This log is cut into product widths to form toilet rolls. Toilet rolls may be packaged as a set.

  FIG. 3 shows a sanitary thin paper product 3 obtained by the manufacturing method described above. In particular, FIG. 3 shows a case where the sanitary thin paper product 3 is tissue paper. In the example shown in FIG. 3, the sanitary thin paper product 3 (tissue paper) is formed of two plies in which the first thin paper 1 and the second thin paper 2 overlap. The first thin paper 1 and the second thin paper 2 have a YD surface and an FD surface, respectively. In FIG. 3, for convenience, the YD surface is indicated by a dot pattern. And as FIG. 3 shows, the sanitary thin paper product 3 of this invention is piled up so that the YD surface of the 1st thin paper 1 and the 2nd thin paper 2 may become inward mutually.

  Further, the sanitary thin paper product 3 may be one in which a moisturizing agent is applied to the YD surfaces of the first thin paper 1 and the second thin paper 2. In this case, the sanitary thin paper product 3 may be manufactured by the process shown in FIG. On the other hand, the sanitary thin paper product 3 may be one in which a humectant is applied to the FD surfaces of the first thin paper 1 and the second thin paper 2. In this case, the sanitary thin paper product 3 may be manufactured by the process shown in FIG.

  As mentioned above, in this specification, in order to express the content of this invention, embodiment of this invention was described, referring drawings. However, the present invention is not limited to the above-described embodiments, but includes modifications and improvements obvious to those skilled in the art based on the matters described in the present specification.

  For example, in the present specification, a 2-ply sanitary thin paper product has been described with reference to FIGS. However, the present invention is not limited to a 2-ply sanitary thin paper product, and can also be applied to a 3-ply sanitary thin paper product.

  The present invention relates to a sanitary thin paper product and a method for producing the same. Therefore, the present invention can be suitably used in the manufacturing industry of sanitary thin paper products such as tissue paper and toilet paper.

DESCRIPTION OF SYMBOLS 1 ... 1st thin paper 2 ... 2nd thin paper 3 ... Sanitary thin paper product 10 ... 1st original fabric roll 20 ... 2nd original fabric roll 30 ... Pinch roller 40 ... Coater 50 ... Lamination roller 60 ... Winding roller

Claims (2)

A step of obtaining a thin paper having a surface (YD surface) in contact with the Yankee dryer, by making paper stock containing pulp into contact with a Yankee dryer and drying;
Winding the thin paper to form a plurality of raw rolls;
A method for producing a sanitary thin paper product comprising the step of superimposing a plurality of the thin papers fed from the plurality of raw rolls ,
In the superimposing step, the two thin paper sheets located on the outermost sides are superposed with the YD surface facing inward,
Only the surface opposite to the YD surface (FD surface) of at least one of the two outermost thin papers after the step of forming the original fabric roll and before the step of superimposing A method for producing sanitary thin paper products, further comprising the step of applying a moisturizing agent. In the step of applying the humectant, the humectant is applied only to the FD surface of both of the two outermost thin papers.
The manufacturing method of the sanitary thin paper product of Claim 1.

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