JP2017057536A - Sanitation sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sanitation sheet high in fixation percentage of a softener and excellent in feeling.SOLUTION: There is provided a sanitation sheet having improved touch or feeling with increasing softener content because fixation percentage of a softener can be enhanced by filling a coagulant together with the softener into the sanitation sheet. There is provided a sanitation sheet therein preferably the coagulant is a cationic coagulant and content thereof is 1 wt.% or more. Further there is provided a sanitation sheet which is preferably a tissue paper containing both or one of dry paper strengthening agent and wet paper strengthening agent and having basis weight of 10 to 25 g/m.SELECTED DRAWING: None

Description

  The present invention relates to a household sanitary paper.

  Thin sanitary paper such as tissue paper used at home requires a certain degree of tensile strength to be pulled out of a box or bag, but it touches the skin directly, so a smooth and soft texture is required. Is done. For this reason, by adjusting the blending ratio of softwood pulp, hardwood pulp, etc., and adjusting the amount of softening agent and paper strength agent added to the papermaking raw material, it has a good touch and excellent strength. Attempts have been made to obtain sanitary paper (Patent Documents 1 to 3).

  It is also known to refer to the HF value (hand feel value) of sanitary paper as an objective index that comprehensively shows the feel of sanitary paper, the texture, smoothness, suppleness, and volume. (Patent Document 4). For this reason, adjustments are made to the blending ratio of the papermaking raw materials and the addition amount of the chemicals so that the HF value of the sanitary paper becomes high.

Japanese Patent No. 3216557 Japanese Patent No. 4762846 Japanese Patent No. 3010904 JP 2013-236903 A

  It is a well-known fact that it is preferable to add a softening agent to sanitary paper in order to improve the HF value, which is an index of sanitary paper texture, as in the prior art. However, in the case of thin sanitary paper such as tissue paper, there is a problem that even if a softening agent is added to the raw material, the fixing rate of the softening agent is low and the HF value of the sanitary paper cannot be improved efficiently. It has been found by the present inventors.

  Therefore, an object of the present invention is to provide a sanitary paper having a high fixing ratio of a softening agent and an excellent texture.

  The inventor of the present invention has intensively studied the means for solving the above problems. As a result, by adding a coagulant together with a softening agent to the sanitary paper, the fixing ratio of the softening agent is increased. We have found that we can improve the index. 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 sanitary paper such as tissue paper and toilet paper. The sanitary paper of the present invention is characterized by containing a coagulant and a softening agent. Thus, by adding the coagulant together with the softening agent to the sanitary paper, the fixing ratio of the softening agent can be increased, and as a result, the HF value (texture) of the sanitary paper can be increased.

  In the sanitary paper of the present invention, the coagulant is preferably a cationic coagulant. The sanitary paper contains a cationic coagulant together with a softening agent, which further improves the fixing rate of the softening agent. That is, there are many fine fibers and anionic impurities in the pulp slurry as the raw material for sanitary paper. For this reason, by adding a cationic coagulant to the pulp slurry, the cationic coagulant and anionic impurities are combined, and the inhibition of chemical fixation by the anionic impurities is reduced. Then, by adding a softening agent to the pulp slurry, the softening agent becomes easy to bind to the pulp fiber without being inhibited by anionic impurities, so that the softening agent is uniformly fixed to the pulp fiber. Become. Thus, by adding a softening agent together with a cationic coagulant to the pulp slurry, or adding a softening agent after the cationic coagulant, the distribution of the softening agent in the slurry is made uniform and its fixing rate is increased. Is thought to improve. As a result, the feel and texture of the sanitary paper are improved.

  In the sanitary paper of the present invention, the content of the coagulant is preferably 1 ppm by weight or more. The upper limit of the content of the coagulant is not particularly limited, but the content of the coagulant is preferably, for example, 500 ppm by weight or less. Here, “weight ppm” is ppm relative to the weight of the pulp constituting the sanitary paper. Thus, sanitary paper contains 1 weight ppm or more of a coagulant, and accordingly, the fixing ratio of the softening agent can be increased to a suitable value at which the texture of the sanitary paper is good.

  The sanitary paper of the present invention preferably contains, in addition to the coagulant and softener, either or both of a dry paper strength agent and a wet strength agent. By including a coagulant in sanitary paper, the fixing rate of not only softeners but also dry and wet paper strength agents is improved. For this reason, by adding a coagulant to the sanitary paper, it becomes a sanitary paper with a good touch and excellent strength.

The sanitary paper of the present invention is preferably a thin paper having a basis weight in the range of 10 to 25 g / m ² . In particular, the sanitary paper of the present invention is preferably tissue paper having a basis weight in the range of 10 to 25 g / m ² . Thin paper having a basis weight in the range of 10 to 25 g / m ² is said to be difficult to improve the fixing rate of the softening agent. In this respect, like the sanitary paper of the present invention, by containing a coagulant together with the softening agent, even if the basis weight is 10 to 25 g / m ² , the fixing rate of the softening agent is efficiently increased, and the texture It becomes possible to improve.

  As described above, according to the present invention, it is possible to provide a sanitary paper having a high fixing ratio of the softening agent and excellent texture.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. This invention is not limited to the form demonstrated below, The thing suitably changed in the range obvious to those skilled in the art from the following forms is also included.

  In the present specification, “sanitary paper” means “sanitary paper” defined by JIS “paper, paperboard and pulp terms” (JIS P 0001). “Sanitary paper” includes towels, sanitary paper, tissue paper, toilet paper, and dust paper. “Sanitary paper” refers to other papers (newspaper rolls, printing / information papers, packaging papers, hybrid papers) and paperboards (corrugated paperboard, paperboard board, building material paper, paper tube paper, It is clearly distinguished from wamp, other paperboard).

The present invention relates to a household sanitary paper used as tissue paper or toilet paper. In particular, the sanitary paper of the present invention is preferably a thin paper having a basis weight in the range of 10 to 25 g / m ² . In addition, the sanitary paper of the present invention can be made into a product of 2 plies or 3 plies by superimposing two or three or more sheets.

  The sanitary paper of the present invention can be produced by a preparation process for obtaining a papermaking raw material (pulp slurry) that is a suspension of raw pulp fibers, and a papermaking process for forming raw fiber fibers from a papermaking raw material to form a fiber web and drying it. . The sanitary paper of the present invention contains a coagulant and a softening agent.

  In the adjustment process, the papermaking raw material used as the raw material for the sanitary paper is adjusted. Pulp is the main raw material for papermaking. Examples of raw material pulp include kraft pulp (KP) such as hardwood bleached kraft pulp (LBKP) and softwood bleached kraft pulp (NBKP); chemical pulp such as sulfite pulp (SP) and soda pulp (AP); semi-chemical pulp Semi-chemical pulp such as (SCP) and Chemi-ground wood pulp (CGP); Mechanical pulp such as ground wood pulp (GP) and thermomechanical pulp (TMP, BCTMP); Non-wood pulp, cotton pulp such as cotton linter and cotton lint, and deinked pulp made from waste paper. As the papermaking raw material, one kind of raw material pulp may be used or plural kinds of raw material pulps may be used in any ratio depending on the use of the thin paper and the required performance. The raw pulp may be unbeaten pulp, or may be beaten in whole or in part.

  In the adjustment step, a chemical containing a coagulant and a softening agent is added to the papermaking raw material (pulp slurry). In the present invention, a coagulant is added to the papermaking raw material, and after stirring and uniformly mixing the coagulant, a softener and other chemicals are added to the papermaking raw material mixed with the coagulant. Is preferred. However, a coagulant and a softening agent can be added to the papermaking raw material at the same time.

  There are many fine fibers and anionic impurities in papermaking materials. Therefore, by first adding a polymer called a coagulant to the papermaking raw material, it is possible to block anionic impurities contained in the papermaking raw material, and then add softeners and other chemicals added to the papermaking raw material. Can be uniformly distributed. For this reason, it is preferable to use a cationic coagulant as the coagulant. Examples of the cationic coagulant include polydiallyldimethyl, ammonium chloride (pDADMAC) or a derivative thereof, a copolymer of diallyldimethylammonium chloride and another monomer, polyacrylamide, polyamine, polyethyleneimine, 2- (methacryloyloxy). ) Ethyltrimethylammonium chloride polymer, modified polyethyleneimine and the like. In particular, two of polyacrylamide and 2- (methacryloyloxy) ethyltrimethylammonium chloride polymer are preferable, and 2- (methacryloyloxy) ethyltrimethylammonium chloride polymer is more preferable. Moreover, as a cationic coagulant | flocculant, what was mentioned here can be used combining 1 type (s) or 2 or more types. In addition, the kind of coagulant is not limited to what was illustrated here.

  The weight average molecular weight (Mw) of the coagulant is preferably 100,000 to 3,000,000, more preferably 500,000 to 2.5 million. Thus, by using a relatively low molecular weight polymer as a coagulant, chemicals such as a softener added later can be more uniformly diffused. The weight average molecular weight (Mw) is a value measured by a gel permeation chromatography method (GPC method) using standard PEO as a molecular weight standard.

  The amount of the coagulant added to the papermaking raw material is preferably, for example, 1 ppm by weight or more, 10 ppm by weight or more, 30 ppm by weight or more, or 50 ppm by weight or more with respect to the weight of the pulp contained in the papermaking material. The upper limit of the addition amount of the coagulant is not particularly limited, and may be, for example, 500 ppm by weight or less, 400 ppm by weight or less, 300 ppm by weight, or 200 ppm by weight or less.

  After the coagulant is added to the papermaking raw material and stirred, a softening agent is further added to the papermaking raw material mixed with the coagulant. A softener is a drug for improving the softness of paper. As the softening agent, known ones such as an anionic surfactant, a nonionic surfactant, a cationic surfactant, and a zwitterionic surfactant can be used. In particular, in the present invention, it is preferable to use a cationic surfactant as the softening agent. As the cationic surfactant, for example, quaternary ammonium salts, amine salts, amines, fatty acid amides, fatty acid esters and the like can be used alone or in admixture of two or more. The amount of the softener added is, for example, 0.02% to 1.00%, 0.10% to 0.80%, or 0.20% to 0.50 based on the weight of the pulp contained in the papermaking raw material. % Is preferred.

  After the coagulant and softening agent are added to the papermaking raw material and stirred, the paper strength of the papermaking raw material in which the coagulant and softening agent are mixed is either or both of the dry paper strength and the wet strength. It is preferable to further add an agent. A dry paper strength agent is a chemical for enhancing the strength of paper in a dry state. As the dry paper strength agent, for example, known ones such as cationized starch, polyacrylamide (PAM), and carboxymethyl cellulose (CMC) can be used alone or in admixture of two or more. The wet paper strength agent is a chemical for suppressing a decrease in paper strength (paper strength) when the paper gets wet with water. As the wet paper strength agent, for example, known materials such as polyamide / epichlorohydrin resin, urea resin, melamine resin, and thermal crosslinkability imparting polyacrylamide (PAM) can be used alone or in combination of two or more. In particular, it is preferable to use a cationic paper strength agent as a paper strength agent for a dry paper strength agent or a wet strength agent. The addition amount of these paper strength agents is preferably 0.01% to 0.60%, or 0.05% to 0.30%, for example, with respect to the weight of the pulp contained in the papermaking raw material.

  As described above, in the manufacturing process of the sanitary paper of the present invention, the coagulant, the softening agent, and the paper strength agent (dry paper strength agent and / or wet strength force agent) in this order with respect to the papermaking raw material. It is preferable to add while stirring appropriately. There are many fine fibers and anionic impurities in the system of raw papermaking raw materials. For this reason, first, a cationic coagulant is added to the papermaking raw material and stirred well, so that the cationic coagulant and the anionic contaminants are combined to block the anionic contaminants contained in the papermaking raw material. be able to. When a certain amount of anionic impurities is blocked, a softening agent is added to the papermaking raw material system so that the softening agent can easily bind to pulp fibers without being inhibited by the anionic impurities. For this reason, the softener is uniformly fixed to the pulp fiber. Thereby, the fixing distribution of the softening agent in the papermaking raw material can be made uniform. Furthermore, when the softener is uniformly mixed with the papermaking raw material, these paper strength agents can be uniformly distributed by adding a dry strength paper or a wet strength paper strength agent. For this reason, it is preferable to first add a coagulant to the papermaking raw material, and then add a softener and a paper strength agent.

  The papermaking raw material adjusted in the above adjustment process is made into a sanitary paper in the papermaking process. The paper making process can be performed using a general paper machine. Typical papermaking processes include wire part, press part, dryer part, calendar part, and reel part.

  The wire part is a process in which the injected papermaking raw material (pulp) is dehydrated to form a sheet. In the wire part, the papermaking raw material with the components prepared in advance is supplied to the forming unit in a state of containing a large amount of moisture to form a paper layer of one-layer papermaking or two-layer papermaking that becomes the prototype of sanitary paper. . A large amount of moisture contained in the papermaking raw material is dehydrated here, and the texture of the wet paper is prepared.

  The press part is a process in which pressure is applied to the papermaking material that has been made into a sheet to further dehydrate it. In the press part, pressure is applied to the wet paper formed in the wire part, and water contained in the wet paper is squeezed out. Here, the surface of the wet paper is smoothed, and at the same time, the density of the pulp component constituting the main part of the wet paper is increased to form a strong wet paper.

  The dryer part is a process in which a sheet of papermaking raw material is introduced into the dryer and completely dried by applying heat. In the dryer part, the wet paper that has passed through the press part is heated by a Yankee dryer to forcibly evaporate excess water. As a result, paper obtained by drying the wet paper is obtained. The paper that has been wound around the mirror roll of the Yankee dryer and dried is peeled off from the surface of the mirror roll while being creped by a creping doctor, and is transported to the subsequent calendar part.

  The calendar part is a process in which the surface of the sheet after drying is stretched while being pressed to smooth the surface of the sheet. In other words, in the calendar part, the paper in a nearly completed state is introduced between a pair of calendar rolls, thereby smoothing the surface of the paper and increasing its density.

  The reel part is a step of winding a long paper obtained through each step to form a roll body in which the paper is wound in multiple layers. At the reel part, the finished paper, that is, the base paper of sanitary paper that becomes a piece of tissue paper, is wound up in a roll. After that, two sanitary paper rolls obtained through the above-mentioned process are prepared, and they are stacked and cut in a separate process, so that two sets of tissue paper products (2-ply) Can be obtained. Also, by preparing three rolls of sanitary paper base paper, it is possible to obtain a set of three (three ply) tissue paper products.

The sanitary paper concerning this invention is manufactured through the said process. The sanitary paper of the present invention is preferably a thin paper having a basis weight in the range of 10 to 25 g / m ² . In particular, the sanitary paper of the present invention is preferably tissue paper or toilet paper.

  The sanitary paper concerning this invention can be manufactured according to said process. The sanitary paper of the present invention contains at least a coagulant and a softening agent. The coagulant is preferably a cationic coagulant. Moreover, it is preferable that content of a coagulant is 1 weight ppm or more, 10 weight ppm or more, 30 weight ppm, or 50 weight ppm or more with respect to the weight of the pulp which comprises sanitary paper. The upper limit of the content of the coagulant is not particularly limited, and may be, for example, 500 ppm by weight or less, 400 ppm by weight or less, 300 ppm by weight, or 200 ppm by weight or less.

  Moreover, it is preferable that content of a softening agent is 0.02% or more, 0.1% or more, or 0.5% or more with respect to the weight of the pulp which comprises sanitary paper. The softener content increases with increasing coagulant content. For this reason, in order to improve the fixing rate of the softening agent, the content of the coagulant may be increased. Although the upper limit of content of a softening agent is not specifically limited, For example, what is necessary is just to set it as 1.0% or less, 0.9% or less, or 0.8% or less.

  As described above, by including a coagulant together with the softening agent in the sanitary paper, the fixing ratio of the softening agent is improved and the concentration of the softening agent (weight to pulp) is increased. For this reason, the sanitary paper is excellent in texture and touch. The texture and feel of sanitary paper can be indicated by the HF value (hand feel value). The HF value is measured under the following conditions.

[Measurement condition of HF value]
In the present specification, the “HF value” means a value measured according to the following measurement conditions.
・ Measuring machine: tissue softness analyzer ・ Manufacturer: Emtec Electronic GmbH (Germany)
・ Japan agency: Nippon Luft Co., Ltd. ・ Standard sample shape: Sample cut into a circle with a diameter of about 112.8 mm ・ Measurement environment: Environment conforming to ISO 187 (23 ° C. ± 1 ° C., humidity 50% (± 2%))
・ Measurement conditions: 1 point calibration with standard sample (emtec ref.2X (nn.n)) according to the attached instruction, and the algorithm is set to facial II. The calculation software used was emtec measurement system ver.2.98.
For the sample installed on the sample stage, the vibration frequency when the rotor with blade is pushed from above with an indentation pressure of 100 mN and rotated at a rotation speed of 2.0 (/ sec), and the sample installed on the sample stage The HF value (hand feel value) can be obtained from the amount of deformation in the vertical direction when the bladed rotor is pushed from above with a pushing pressure of 100 mN and 600 mN without rotating the bladed rotor. The measurement is performed 8 times for each of the front and back surfaces of each sample, and the average value of 8 acquired HF values is excluded from the average value exceeding ± 2 x [standard deviation of the average value], and then averaged again. The HF value of each sample was obtained.

  In order for the sanitary paper of the present invention to be excellent in touch and texture, the HF value measured under the above conditions is preferably 80 or more. If the HF value is less than 80, the sanitary paper is hard to touch and has a poor texture. The HF value of the sanitary paper is preferably 80 or more or 81 or more, and particularly preferably 83 or more or 85 or more.

  Moreover, in addition to the above-mentioned coagulant and softener, the sanitary paper may further contain one or both of a dry paper strength agent and a wet paper strength agent. The content of the paper strength agent is preferably 0.05% or more, 0.08% or more, or 0.10% or more with respect to the weight of the pulp constituting the sanitary paper. The upper limit of the content of the softening agent is not particularly limited, but may be, for example, 3% or less, 2% or less, or 1% or less.

  As described above, by adding the coagulant together with the softening agent to the sanitary paper, the content of the softening agent in the sanitary paper can be improved, and the HF value serving as an index of texture and touch can be increased. Examples for confirming the effects of the present invention will be described below.

  Table 1 shows a list of various measurement results related to the examples and comparative examples of the present invention.

In Example 1 of the present invention, 60% hardwood kraft pulp (hereinafter “LBKP”) is blended out of the whole pulp slurry (100%) as a raw material for making sanitary paper, and softwood pulp (hereinafter “NBKP”). 40%). In Example 1, 0.005% by weight of a coagulant (vs. pulp weight: 50 ppm) was added to the pulp slurry and stirred, and then 0.2% by weight of a softener was added and stirred. A wet paper strength agent was added at 0.08% by weight and stirred, and sanitary paper having a basis weight of 15.2 g / m ² was obtained using a single-layer long net paper machine. As an additive chemical, NR70N manufactured by Hymo Co., Ltd. was used as a coagulant. The main component of NR70N is 2- (methacryloyloxy) ethyltrimethylammonium chloride polymer. As the softening agent, FS8015 manufactured by Seiko PMC Co., Ltd. was used. The wet paper strength agent used was Arafix 255 from Arakawa Chemical Industries.

In Example 2 of the present invention, a pulp slurry having the same composition as that of Example 1 was used for making sanitary paper. In Example 2, 0.01% by weight of the coagulant (based on pulp weight: 100 ppm) was added to the pulp slurry and stirred, and then 0.2% by weight of the softening agent was added and stirred. A wet paper strength agent was added at 0.08% by weight and stirred, and sanitary paper having a basis weight of 15.5 g / m ² was obtained using a single-layer long net paper machine. The same coagulant, softener, and wet paper strength agent as in Example 1 were used. That is, in Example 2, compared with Example 1, the amount of the coagulant added was increased.

In Comparative Example 1, a pulp slurry having the same composition as that of Example 1 was used for making sanitary paper. In Comparative Example 1, 0.005% by weight of the coagulant (vs. pulp weight: 50 ppm) was added to this pulp slurry and stirred, and then 0.08% by weight of wet paper strength without adding a softening agent. % Was added and stirred, and sanitary paper having a basis weight of 15.1 g / m ² was obtained using a single-layer long net paper machine. The same coagulant and wet paper strength agent as in Example 1 were used. That is, Comparative Example 1 is one in which a softening agent is not added as compared with Example 1.

In Comparative Example 2, a pulp slurry having the same composition as that of Example 1 was used for making sanitary paper. In Comparative Example 2, 0.2% by weight of a softening agent was added to this pulp slurry without adding a coagulant and stirred, and then 0.08% by weight of a wet paper strength agent was added and stirred. A sanitary paper having a basis weight of 15.3 g / m ² was obtained using a single-layer long net paper machine. The same softener and wet paper strength agent as in Example 1 were used. That is, Comparative Example 1 is a case in which no coagulant is added as compared with Example 1.

  Concentration, basis weight, thickness, HF value, dry tension of coagulant / softener / wet paper strength agent for each of the sanitary papers of Example 1, Example 2, Comparative Example 1 and Comparative Example 2 described above Strength and wet tensile strength were measured.

  In measuring the concentration of various agents such as a coagulant, a softener, and a wet paper strength agent, first, two sets of samples (200 to 300 μg) in which sanitary paper was cut out were prepared. For each sample, using a pyrolysis gas chromatograph mass spectrometer (pyrolysis apparatus: PY-2020D manufactured by Frontier Laboratories, gas chromatograph mass spectrometer: 5973N manufactured by Agilent Technologies), the chemical content concentration (ratio to weight of pulp) ) Was measured. The measurement was performed twice for each sample, and the average value was defined as the chemical content concentration (weight ratio of pulp) of sanitary paper. The concentration of the coagulant is shown in ppm, and the content of the softener and the wet paper strength agent is shown in% by weight.

  The measured value of the basis weight indicates the measured value of 1-ply sanitary paper. The basis weight was measured in accordance with JIS P8124.

  The measured thickness value indicates the measured value of 1-ply sanitary paper. Thickness is measured according to ISO187 (temperature 23 ° C ± 1 ° C, humidity 50% ± 2%), using a thickness gauge (manufactured by Hibridge Seisakusho) at a speed of 1 mm or less per second. It is a value measured by lowering. In addition, the measurement measured eight samples one by one, and averaged the acquired eight thickness values.

  The HF value of the sanitary paper is a value measured using a 2-ply sanitary paper in a 2-ply state. The measurement conditions for the HF value of the sanitary paper are the same as those described above. When the HF value is less than 80, the sanitary paper is inferior in texture and touch. For this reason, those having an HF value of less than 80 were considered inappropriate.

  The measurement of the dry tensile strength of sanitary paper was carried out with 2 plies. The dry tensile strength was measured according to JIS P8113. When the geometric average of the dry tensile strength in the machine direction and the transverse direction is less than 1.5 [N / 25 mm], troubles such as paper breakage occur during paper making. For this reason, as the measurement result of the dry tensile strength, those having a geometric average of 1.5 [N / 25 mm] or less were considered inappropriate.

  The wet tensile strength of the sanitary paper was measured with 2 plies. Wet tensile strength is an environment compliant with ISO 187 (23 ° C ± 1 ° C, humidity 50% ± 2%), and one set of two 25mm wide samples is Tensilon Universal Material Testing Machine (manufactured by A & D Co., Ltd.) Measured with In the measurement, distilled water was included in tweezers with felt, and the sample was sandwiched between the tweezers and wetted. When the longitudinal wet tensile strength was less than 0.6 [N / 25 mm], the sanitary paper was easily torn when it was wet.

  As shown in Table 1 above, the sanitary paper of Example 1 (containing a coagulant and a softener) has a softener-containing concentration of 0.29% by weight, an HF value of 81.3, and a texture and texture. It showed a good value from the viewpoint of. In Example 2, the addition amount of the softening agent at the time of papermaking is the same as that in Example 1, but in Example 2, the addition amount of the coagulant is increased. As a result, the sanitary paper of Example 2 had a softener-containing concentration of 0.36% by weight, an HF value of 85.1, and a better texture and feel. This indicates that by increasing the amount of the coagulant added at the time of papermaking, the fixing rate of the softening agent is increased and the HF value of the sanitary paper is improved. For this reason, it was confirmed that the coagulant improves the softener-containing concentration in the sanitary paper and increases the HF value of the sanitary paper.

  In Comparative Example 1, a coagulant is added without adding a softening agent. In this case, the sanitary paper of Comparative Example 1 had a softener content of zero or extremely low, so the HF value was lower than that of the sanitary paper of Example 1 and Example 2. The sanitary paper of Comparative Example 1 had an HF value of 76.5, and was unacceptable as a product from the viewpoint of texture and touch. This indicates that the addition of a coagulant alone cannot improve the texture of sanitary paper, and it is necessary to add both a coagulant and a softener to improve the texture. The sanitary paper of Comparative Example 1 has a softener content concentration of 0.03% by weight. This is because the softener remaining in the system is fixed on the sanitary paper. There is no particular impact.

  Moreover, the comparative example 2 adds a softening agent, without adding a coagulant. In this case, the sanitary paper of Comparative Example 2 had a softener-containing concentration and an HF value lower than those of the sanitary papers of Example 1 and Example 2. The sanitary paper of Comparative Example 2 had an HF value of 77.3, and was unqualified as a product from the viewpoint of texture and touch. This indicates that the addition of the softening agent alone cannot improve the texture of sanitary paper, and it is necessary to add both a coagulant and a softening agent in order to improve the texture.

  Further, in Comparative Example 2, the amount of the softening agent added at the time of papermaking was 0.2% by weight, and the concentration of the softening agent in the sanitary paper was 0.21% by weight. On the other hand, in Example 1, the amount of the softener added at the time of papermaking was 0.2 wt%, whereas the sanitary paper had a softener content concentration of 0.29 wt%, and the softener content concentration was 0.29 wt%. It can be seen that it has improved. Furthermore, in Example 2, the softener addition amount at the time of papermaking is 0.2% by weight, whereas the sanitary paper has a softener content concentration of 0.36% by weight, which is significantly improved. doing. This indicates that the fixing rate of the softener on the sanitary paper can be increased by adding a coagulant at the paper making stage.

  In Comparative Example 2, a wet paper strength agent was added without adding a coagulant. The sanitary paper of Comparative Example 2 has a wet paper strength agent concentration of 0.11, which is lower than the sanitary paper of Example 1 or Example 2. Further, the sanitary paper of Comparative Example 2 has a longitudinal wet tensile strength of 0.633 [N / 25 mm], which is also lower than the sanitary paper of Example 1 and Example 2. This indicates that, as in Example 1 and Example 2, by adding a coagulant, the fixing rate of the wet paper strength agent is improved and the wet tensile strength of the sanitary paper can be increased.

  As described above, it was confirmed that sanitary paper contains a coagulant and a softening agent, so that the fixing rate of the softening agent is increased and the touch and texture are excellent. It was also confirmed that sanitary paper contains a coagulant and a paper strength agent, which increases the strength of the paper strength agent and improves the tensile strength.

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

  The present invention can be suitably used in the sanitary paper manufacturing industry.

Claims (5)

  Sanitary paper containing coagulant and softener. The sanitary paper according to claim 1, wherein the coagulant is a cationic coagulant. The sanitary paper according to claim 1 or 2, wherein the content of the coagulant is 1 ppm by weight or more. The sanitary paper according to any one of claims 1 to 3, further comprising a dry paper strength agent and / or a wet paper strength agent. The sanitary paper is, sanitary paper according to any one of claims 1 to 4 having a basis weight of thin paper in the range of 10 to 25 g / m ^2.