JP4578910B2 - Rolled toilet paper - Google Patents

Description

  The present invention relates to a roll of toilet paper in which a plurality of webs are stacked. More specifically, the present invention relates to a roll-like toilet paper that is soft and soft to touch, has a long roll-up length, and provides consumers with economic satisfaction.

  In general, rolled toilet paper (hereinafter sometimes referred to as toilet roll) is formed by winding one or two sheets of web around a paper tube. A web obtained by winding two webs is called a 2-ply.

Such a toilet roll usually has a web having a basis weight of 20 to 30 g / m ² wound around a paper tube having a diameter of about 45 mm and a winding length of about 60 m for one ply and about 30 m for two plies. In general, the diameter is about 110 mm.

However, a conventional toilet roll can be wound up twice as long as a one-ply one compared to a two-ply one, but it is inferior in softness when touched by hand, has a poor touch, and feels good to use. Was inferior.
On the other hand, the two-ply one is softer and softer than the one-ply one, and has a good feeling of use, but it gives the consumer the impression that it is uneconomical because the winding length is short. It was. In this case, if the winding length is increased, the diameter of the roll becomes too large to fit in a normal holder.
Therefore, there has been a strong demand for a toilet roll having the same winding length as that of 1 ply while maintaining the feeling of use of 2 plies.

In addition, as an example of a toilet roll formed by laminating a plurality of webs, an absorptive material obtained by embossing a specific shape on a double-layered sheet for the purpose of enhancing the absorbability of an absorbent sheet such as toilet paper Sheet (Patent Document 1), Toilet paper (Patent Document 2) in which three or more sheets are laminated for the purpose of improving water absorption, or roll length of roll for the purpose of imparting softness Toilet paper rolls (Patent Document 3), etc. in which the value divided by the cross-sectional area falls within a specific range have been proposed. However, none of these prior documents disclose a toilet roll having the same winding length as that of one ply while maintaining the wearing feeling of the two plies.
JP 2002-88694 A JP 2002-172072 A JP 2002-345676 A

  The present invention overcomes the problems of the conventional toilet roll and maintains the feeling of use of two plies, etc., and makes the winding length the same as that of one ply, giving consumers a sense of economic satisfaction. Toilet rolls are provided.

  The present invention for solving the problems of the conventional toilet roll includes the following inventions.

(1) wherein the plurality of basis weight per sheet thickness at 8~13g / m ² is rolled toilet paper for laminates overlaid one more single web is 35-60, to form a laminate A sheet having a basis weight of 15 to 30 g / m ² and a thickness of 65 having a basis weight of less than the total of the basis weight and the total thickness of the web and a roll having a smaller thickness and being wound into a roll. a ～125Myuemu, and rolled toilet paper winding length, wherein the diameter at 60~100m is 100～115Mm.

(2) softness of the laminate of the rolled toilet paper, in the longitudinal and transverse directions both characterized in that it is a 10~45mN / 100mm (1) Kouki placing of the rolled toilet paper.

( 3 ) The roll-shaped toilet paper according to (1) or (2 ), wherein two sheets of the web are overlapped.

( 4 ) The roll-shaped toilet paper according to (1) or (2 ), wherein three sheets of the web are overlapped.

( 5 ) The roll-like toilet paper according to any one of (1) to ( 4 ), wherein the web is subjected to a soft calendar process.

( 6 ) The soft calender process is a process in which one stack is processed by an on-machine calendar for each web, and then two sheets are stacked by a ply machine, and further one or two stacks are processed ( 5 ) Rolled toilet paper.

( 7 ) The roll-like toilet paper according to ( 5 ) or ( 6 ), wherein the density of the overlapped web after the soft calender treatment is 0.26 to 0.34 g / cm ³ .

Rolled toilet paper of the present invention (toilet rolls) is wound what was a laminate having a basis weight of 15 to 30 g / m ² and superposed 2-3 sheets of the basis weight 8~13g / m ² web into a roll The roll length is 60 to 100 m and the roll diameter is 100 to 115 mm. That is, the toilet roll of the present invention uses a web having a lower basis weight and a thinner thickness than a conventional web as a web for forming a laminate, and further, the basis weight and thickness of each laminate are set to the basis weight of each web. In addition, it is formed by winding a material having a thickness less than the total thickness.
Such a toilet roll of the present invention is manufactured by controlling the tension and linear pressure of the web in the calendaring process or controlling the tension of the web in the roll-up process when manufacturing the toilet roll. be able to.

  The toilet roll of the present invention having such a configuration can maintain the same roll diameter as that of one ply even when the toilet roll is wound up to the same length as that of one ply. Since air is contained between the webs, it feels better than the one-ply case, and is soft and excellent in usability.

In the present invention, the web for forming a laminate that is a toilet roll has a basis weight per sheet of 8 to 13 g / m ² and a basis weight of the laminate of 15 to 30 g / m ^2. preferable. When the basis weight of the web is less than 8 g / m ² , the strength of the web becomes weak and it becomes impossible to manufacture a toilet roll. Moreover, when the basis weight increases beyond 13 g / m ² , the formed laminate becomes thick, and when this is wound up to a predetermined length, the roll diameter becomes too large to fit in a normal holder. It will disappear.

  In the present invention, the roll formed by winding the laminate preferably has a winding length of 60 to 100 m and a diameter of 100 to 115 mm. If the winding length is 60 to 100 m, economic satisfaction can be given to consumers, and if the diameter is 100 to 115 mm, it can be stored in a normal holder.

In this invention, it is preferable that the thickness per web is 35-60 micrometers, and it is preferable that the laminated body which laminated | stacked the web is 65-125 micrometers. When the thickness of the web is less than 35 μm, the strength of the web is reduced. On the other hand, when the thickness exceeds 60 μm, the roll diameter increases when the laminated body obtained by superimposing the web is wound to a predetermined length. It will not fit in the holder.
Also, if the thickness of the laminate is reduced to less than 65 μm, the density of the web increases and the softness is impaired. On the other hand, if the thickness exceeds 125 μm, the laminate is wound up to a predetermined length. The roll diameter will be large and will not fit in a normal holder.

  In the present invention, the laminate is a J.P. TAPPI Paper Pulp Test Method No. 34-80. It is preferable that the softness measured by the softness test method of sanitary thin paper is 10 to 45 mN / 100 mm in both the vertical and horizontal directions. When the softness is less than 10 mN / 100 mm, the strength of the laminate is lowered. On the other hand, when the softness is larger than 45 mN / 100 mm, the feeling of touch becomes worse.

  In this invention, it is preferable to form the laminated body which is a toilet roll by laminating | stacking 2-3 sheets of webs. By laminating 2 to 3 webs to form a laminate, it is possible to form a laminate that is soft to the touch, soft and excellent in usability, and even when rolled up to a predetermined length. Can be obtained. On the other hand, when four or more webs are overlapped, the thickness of the laminate increases, and when the roll is wound to a predetermined length, the roll diameter becomes too large to fit in a normal holder. It becomes difficult to cut out when using the required length.

  In this invention, the web for forming a toilet roll is manufactured mainly using the cellulose pulp obtained from lignocellulose materials, such as wood. Cellulose pulp includes slush pulp in a slurry state produced from chemical pulp obtained by digesting lignocellulosic materials such as hardwood and softwood wood chips, and dry pulp obtained by dehydrating and drying this slush pulp Alternatively, deinked waste paper pulp or the like obtained by deinking waste paper can be used.

  In addition, when using pulp that has been bleached without using elemental chlorine after kraft cooking, the pulp fibers are less damaged than when pulp that has been bleached with elemental chlorine is used. An excellent toilet roll can be obtained, and the toilet roll contains no free chlorine, which is preferable from the viewpoint of hygiene and environment.

  Furthermore, since a pulp having low fading and high whiteness can be obtained by using the pulp acid-treated in the bleaching step as the cellulose pulp, a toilet roll having good whiteness can be obtained.

  Further, if necessary, a softening agent, a lubricant, a paper strength enhancer, a dye, and the like can be blended with the cellulose pulp, and further, a fragrance or the like can be applied to the manufactured toilet roll.

The cellulose pulp used in the present invention can be obtained by cooking wood. As the cooking method, known cooking methods such as kraft cooking, polysulfide cooking, soda cooking, alkali sulfite cooking, etc. can be used, but considering pulp quality, energy efficiency, etc., the kraft cooking method or polysulfide cooking is used. Preferably used.
For example, when kraft cooking of wood, the sulfidity of the kraft cooking solution is 5 to 75%, preferably 15 to 45%, and the effective alkali addition rate is 5 to 30% by weight, preferably 10 to 25% by weight of the absolutely dry wood. %, The cooking temperature is 130-170 ° C., the cooking method may be either a continuous cooking method or a batch cooking method, and when a continuous cooking kettle is used, a modified cooking method in which a cooking solution is added at multiple points may be used. The method is not particularly limited.

  In the present invention, it is possible to provide an alkaline oxygen delignification step generally used after cooking, and it is possible to provide an enzyme treatment step. The enzyme used in the enzyme treatment step may be any enzyme as long as the potassium permanganate value of the pulp measured by JIS P 8206 is decreased by reacting with the pulp. For example, xylanase, lignin peroxidase, manganese peroxidase, laccase and the like are known. Of course, these enzymes may be used, and it is needless to say that enzymes that are not yet known may be applicable enzymes. In addition, these enzymes may be used alone, or may be combined, mixed, and further divided into a plurality of times. Among these enzymes, a xylan-degrading enzyme called xylanase has a bleaching promoting effect and is preferably used.

In the present invention, the acid treatment is preferably performed at an initial reaction pH of 1.5 to 4.5. More preferably, the initial reaction pH is 2.0 to 4.0. When the initial reaction pH is less than 1.5, the adverse effect on the pulp strength is large. On the other hand, when the pH is higher than 4.5, the effect of removing hexeneuronic acid is reduced and the scaling of calcium oxalate in the process becomes severe. .
The temperature of the acid treatment is 60 to 120 ° C., preferably 65 to 105 ° C. If the temperature is less than 60 ° C., the effect of removing hexeneuronic acid is small, while if it exceeds 120 ° C., it adversely affects the pulp strength. Becomes larger.
Furthermore, the retention of the acid treatment is preferably 30 to 300 minutes considering the effect and damage to the pulp fiber, and the treatment concentration is not particularly limited as long as it is a general in-process concentration, but 8 to 15%. The medium concentration method or the high concentration method of 25 to 40% is preferable.
On the other hand, in the acid treatment, hydrogen peroxide may be added at the same time, but the addition rate is preferably 0.05 to 5% per absolutely dry pulp, and 0.1% in view of the effect and damage to the pulp fiber. ~ 2% is more preferred.

  As the acid used in the acid treatment of the present invention, any of inorganic acids and organic acids can be used as long as the pH during acid treatment can be adjusted to 2 to 4, but sulfuric acid, nitric acid, hydrochloric acid, sulfurous acid, Inorganic acids such as nitrous acid, especially sulfuric acid, are preferred because they are easily available and handled. In addition, a general prescription is used for acid treatment.

In the present invention, the multi-stage bleaching process is carried out in a chlorine dioxide bleaching stage (D), an ozone bleaching stage (Z), or a bleaching stage (Z / D) in which ozone bleaching and chlorine dioxide bleaching are successively combined. Etc.) is preferably used, the alkali extraction stage (E) is used in the second stage, and a combination of chlorine dioxide, alkali hydrogen peroxide, etc. is preferably used in the third and subsequent stages.
The chlorine dioxide used in the first stage chlorine dioxide bleaching stage can be selected from chlorine dioxide obtained from many chlorine dioxide generation methods known to those skilled in the art, but is preferably obtained from a generation method that does not produce chlorine as a by-product. Chlorine dioxide is used. Moreover, pH in the first stage chlorine dioxide stage is 2 to 6, preferably 2.5 to 4, and any acid or alkali can be supplementarily added to adjust the pH. Moreover, as for other chlorine dioxide bleaching conditions such as chlorine dioxide treatment time, treatment temperature, and pulp concentration, all known conditions can be used.

  In the alkaline extraction stage following the chlorine dioxide bleaching stage, a number of alkaline compounds known to those skilled in the art can be selected, but caustic soda is the easiest to use and is preferably used. In the alkali extraction stage, oxygen and / or hydrogen peroxide can be used in combination. In addition, the alkali extraction stage can be performed under known conditions.

  Any bleaching chemicals other than chlorine and hypochlorite may be used in the bleaching stage from the third stage following the chlorine dioxide bleaching stage and the alkali extraction stage used in the multistage bleaching process, Common bleaching chemicals such as chlorine dioxide, alkaline hydrogen peroxide, ozone and peracid are preferably used. The number of stages after the third stage is not particularly limited, but considering energy efficiency, productivity, etc., it is preferable to finish in three or four stages in total.

As chemicals used in the present invention, acid treatment (A) excluding chlorine and hypochlorite, hydrogen peroxide (A / P) in the acidic region, chlorine dioxide (D), alkali (E), Well-known bleaching agents and bleaching assistants such as oxygen (O), hydrogen peroxide (P), ozone (Z), and organic peracids can be mentioned. As bleaching sequences, A-D-E / O-D, A-D-E / O-P-D, A-D-E / O-D-D, A-D-E / O-D-P , A-D-E / OP-D, A-D-E / O-Z-D, A-Z-E / O-D, A-Z-E / OP-D, A-Z-E / OP -DP, AZ-E / OP-PD, AZ-DE / OD, AZ-DE / OP-D, AZ / DE / O -D, AZ / DE / OP-D, and the like. Further, acid treatment (A) may be replaced with hydrogen peroxide treatment (A / P) in the acidic region.
On the other hand, a chelating agent treatment stage with ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA) or the like may be inserted in the multistage bleaching step.

  In the present invention, as a paper machine for producing a toilet roll, suction breast former (circular type, long net type), twin wire former, circular net former (C wrap, S wrap), crescent former, etc. Although a Yankee paper machine in which a Yankee dryer is combined with this paper machine is used, a crescent former is preferable because a web having a low basis weight can be produced.

  In the present invention, the calendar process for manufacturing the toilet roll is performed by an on-machine calendar process and / or a soft calendar process by a ply machine calendar process. The soft calendar process is usually performed by a calendar device including one metal roll and one elastic roll.

  As the metal roll in the soft calender device, for example, a chilled roll, an alloy chilled roll, a steel chilled roll, and a metal roll whose surface is hard chrome plated are used.

  Elastic rolls include natural rubber, styrene rubber, nitrile rubber, chloroprene rubber, chlorosulfonated ethylene rubber, butyl rubber, polysulfide rubber, silicon rubber, fluorine rubber, urethane rubber, aromatic polyamide resin, polyimide resin, and polyether. Elastic rolls made of various resins such as resin, polyester resin, polycarbonate resin, cotton, paper, wool, nylon, etc. are used.

  As the elastic roll, an elastic roll having a Shore hardness (ASTM standard, D-2240) of 80 to 95 degrees, preferably 85 to 92 degrees is used. As such an elastic roll, an elastic roll using urethane rubber and aromatic amide resin is preferable because it is easy to handle and has a long life.

  In the present invention, the soft calender treatment is preferably performed by applying a linear pressure of 4 to 10 kg / cm using a swimming roll. By using the swimming roll, the tension in the width direction of the web after the calendar process can be made uniform as compared with the case of using the fixed roll.

For example, in the case of a two-ply toilet roll, the soft calender process is preferably performed by stacking two sheets with a ply machine after performing one stack process with an on-machine calendar.
Moreover, it is preferable that the density of the overlapped web after a soft calendar process shall be 0.26-0.34 g / cm < ³ >. By setting the density of the web within this range, the obtained toilet roll has a good touch.

  In the present invention, the web after the soft calendering process is wound on a roll having a predetermined length and cut into a predetermined width in a processing step to produce a toilet roll product. Further, in the processing step, perforation, embossing, and the like can be performed as necessary. The processing machine may be a center winder type or a surface winder type.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not restrict | limited at all by these Examples. In addition, the evaluation and evaluation method which were performed about the roll-shaped toilet paper obtained by each Example and the comparative example are as follows.

Softness:
J. et al. TAPPI Paper Pulp Test Method No. 34-80. It was measured by the softness test method of sanitary thin paper. That is, the amount of work required to push a roll-like toilet paper sheet (200 × 200 mm) into a certain gap (6.35 mm) is measured by Handle-O-Meter (manufactured by Kumagaya Rikyu Kogyo Co., Ltd.), and mN Displayed at / 100 mm.

Feel:
Sensory evaluation was performed with five men and five women, and the following categories were used.
○: Good △: Normal ×: Inferior

Example 1
As the raw material pulp, 70% by mass of dry pulp (manufactured by Cenibra) and 30% by mass of self-made slush pulp are used as hardwood bleached kraft pulp (LBKP), and as softwood bleached kraft pulp (NBKP) Commercially available dry pulp (manufactured by HSPP, product name: HS-300) and 70% by mass of self-made slush pulp were used, each having a freeness of 560 ml (CSF).

In addition, as self-made LBKP, acid treatment (pH 3, temperature 100 ° C., retention time 120 minutes) using sulfuric acid after alkaline oxygen delignification treatment, and white bleached in the bleaching step of DE / OPD Pulp having a degree of 84.2% was used, and as NBKP made in-house, a pulp having a degree of whiteness of 84.2% bleached in the bleaching process of DE / OPD after alkaline oxygen delignification was used. .
Cationized starch (product name: Kate F, manufactured by Oji Cornstarch Co., Ltd.) is added to each raw pulp in an amount of 0.15% by mass based on the mass of the absolutely dry pulp, and the paper is made with a crescent former two-layer yankee paper machine. The LBKP layer and the NBKP layer were laminated, dried so that the LBKP layer was in contact with the mirror surface of the Yankee dryer, and a base paper for toilet rolls having a basis weight of 12.3 g / m ² , a moisture content of 6% and a paper thickness of 48 μm ( Web).

Two sheets of the obtained toilet roll base paper (web) were overlapped with a winder so that the LBKP layer was on the outside and subjected to soft calendering to form a two-layer laminate. The soft calendering process was performed under the condition of a linear pressure of 5 kg / cm with a pair of rolls consisting of a urethane rubber-coated elastic roll having a Shore hardness of 92 degrees on the upper side and a swimming roll having a metal roll on the lower side.
Next, the two-ply laminate is wound around a paper tube (roll diameter: 45 mm) by a surface winding type toilet roll processing machine (manufactured by Perini Co., Ltd.), and a roll-shaped tort paper having a roll diameter of 110 mm and a winding length of 70 m is obtained. Manufactured. At this time, embossing was performed using a matched steel embossing roll. The obtained roll-shaped toilet paper was two-ply, and had a basis weight of 24.1 g / m ² and a thickness of 85 μm.

Example 2
A toilet roll base paper was made in the same manner as in Example 1 except that a base paper having a basis weight of 10.1 g / m ² , a moisture content of 5.5%, and a paper thickness of 38 μm was made as a toilet roll base paper (web).
The obtained base paper (web) for toilet rolls is overlapped with a winder so that the LBKP layer is on the outside, and soft calendering is performed in the same manner as in Example 1 to form a three-layer laminate. Formed.
Next, the three-ply laminate is wound around a paper tube (roll diameter: 45 mm) by a surface winding type toilet roll processing machine (manufactured by Perini Co., Ltd.), and rolled roll paper having a roll diameter of 110 mm and a winding length of 60 m is obtained. Manufactured. At this time, embossing was performed using a matched steel embossing roll. The obtained toilet paper was three-ply, and had a basis weight of 29.3 g / m ² and a thickness of 104 μm.

Comparative Example 1
Evaluation was performed using a commercially available two-layer roll toilet paper (manufactured by Oji Napier, Napier Double).

Comparative Example 2
Evaluation was performed using a commercially available sheet of rolled toilet paper (manufactured by Oji Napier, Napier Single).

  Table 1 shows the evaluation results of the roll-shaped toilet paper of each Example and Comparative Example. As is apparent from Table 1, the roll toilet paper of the present invention of each example has a good touch feeling and the winding length is the same as that of the conventional one-ply product, while the comparative example 1 The 2-ply product has a winding length that is half that of the 1-ply product, and the touch feeling is inferior to that of the product of the present invention. The 1-ply product of Comparative Example 2 has a winding length of Although it is sufficient, the touch feeling is inferior to the product of the present invention, and the effect of the present invention was confirmed.

  The roll-shaped toilet paper of the present invention is a roll of two or three webs wound up in a roll shape, and the winding length can be the same as that of a conventional one-ply product. It can be stored in a normal holder, is soft and soft to the touch, and gives consumers an economic satisfaction.

Claims (6)

A laminate basis weight thickness in 8~13g / m ² was overlaid one more single rolled toilet paper web which is 35~60μm per sheet, the plurality of webs to form a laminate The basis weight is 15 to 30 g / m ² and the thickness is 65 to 125 μm formed as a laminate having a basis weight and a thickness smaller than the total basis weight and the total thickness. There, and the rolled toilet paper winding length, wherein the diameter at 60~100m is 100～115Mm. The roll toilet paper according to claim 1 , wherein the softness of the laminate of the roll toilet paper is 10 to 45 mN / 100 mm in both the vertical direction and the horizontal direction . The roll-shaped toilet paper according to claim 1 or 2, wherein two sheets of the web are overlapped . The roll-shaped toilet paper according to claim 1 or 2 , wherein three webs are overlapped. The roll toilet paper web having a basis weight per sheet of 8 to 13 g / m ² and a thickness of 35 to 60 μm is a web containing cationized starch as a paper strength enhancer. The roll-shaped toilet paper of any one of Claims 1-4. The plurality of webs forming the laminate, the laminate comprising a plurality of roll-shaped toilet paper webs having a basis weight per sheet of 8 to 13 g / m ² and a thickness of 35 to 60 μm. The means for forming a laminate having a basis weight smaller than the total thickness of the basis weight and a total thickness of the laminate is a laminate obtained by superposing a plurality of roll toilet paper webs in a calendar process. Means for controlling the tension and / or linear pressure to the calender and / or means for controlling the tension on the laminate in the step of winding the calendered laminate into a roll. The roll-shaped toilet paper of any one of Claims 1-5 characterized by these .