JP2012050475A - Method of manufacturing core-less toilet paper roll, and core-less toilet paper roll thereby - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a core-less toilet paper roll in which toilet tissues are prevented from wasteful use by shortening a winding length necessary for forming a winding core and loosening is not largely generated at the winding core.SOLUTION: A distance Lfrom a nozzle 8 to the surface of a winding shaft 6 is set so that an overlapping portion L, between nozzles adjacent to each other, of projection width Lof spray water in the winding shaft direction against the surface of the winding shaft is set to be 35-57 mm and spray time from the nozzle 8 is set to be 0.2-1.2 seconds. The winding length necessary for forming a winding core portion 1a formed in a center hollow part of the toilet paper roll 1 is set not to be longer than 2.0 m.

Description

  The present invention relates to a manufacturing method of a coreless toilet paper roll used for a thick shaft holder used in a general household, and a coreless toilet paper roll using the same.

  In general households, many so-called cored toilet paper rolls, in which the central cavity is formed of cardboard, have been used as toilet paper rolls. In recent years, so-called coreless toilet paper rolls that do not use the cardboard core have been used in the market. Has come to be offered.

  In this coreless toilet paper roll, the core portion is formed by the winding start portion of the toilet paper, and water or a water-soluble adhesive is added when starting the winding of the toilet paper around a winding shaft such as an iron core. Manufactured by wrapping toilet paper after spraying.

  However, in the case of a coreless toilet paper roll, a conventional cardboard core is not used, but since multiple layers of toilet paper are bonded together and hardened, a cavity is formed by the bonding, so toilet paper There was a problem that many parts at the beginning of winding were wasted.

  Therefore, in Patent Document 1 described below, a roll-shaped wound portion extending from a front end portion of the toilet paper to a predetermined range is substantially the same as the paper tube core due to spray adhesion of an aqueous solution containing powdery filler. By using the toilet paper roll formed as a cylindrical temporary fixed part temporarily fixed to the same diameter, it can be easily peeled up to the center of the roll, so that the toilet paper can be used up without waste until the end. Toilet paper rolls have been proposed.

  Moreover, in the following Patent Document 2, a cylindrical cavity formed in the center portion of the coreless toilet paper is constituted by a portion wound in a state where the winding start end portion of the paper is folded, and moisture is given to the portion. After that, it consists of a coreless toilet paper that is normally wound up, and furthermore, the coreless toilet paper has a cylindrical cavity formed in the center of the coreless toilet paper and a plurality of paper winding start ends. There has been proposed a coreless toilet paper which is composed of a part wound up in a folded state, water is given to the part, and then the paper is normally wound up. In this coreless toilet paper, the solidified cylindrical part remaining at the end of its use can be removed together with the final paper by simply pulling the remaining paper with your finger. There is no inconvenience of removing separately. In addition, by adjusting the amount of moisture applied to the folded portion at the winding start end of the paper, there is an effect that when the paper is wound up, the final end can be wound up in a single sheet. Is.

JP 2000-189342 A Japanese Patent No. 4103960

  However, the toilet paper rolls according to Patent Documents 1 and 2 propose that all paper parts can be used without discarding the core part composed of toilet paper. When a special aqueous solution containing powdery filler is used as in Document 1, the cost is increased by the amount of the aqueous solution, and the aqueous solution fouls equipment and the operability is lowered. Furthermore, there is a problem that the sheet may be peeled off inside the core before or during use, which is not practical.

  Moreover, in the case of the above-mentioned Patent Document 2, there is a problem that the equipment corresponding to this winding start mode is necessary, and the current equipment cannot cope with it.

  Therefore, the main problem of the present invention is to eliminate the waste of toilet paper by shortening the winding length necessary for forming the core in the coreless toilet paper roll that forms the core at the winding start portion of the toilet paper, An object of the present invention is to provide a method for manufacturing a coreless toilet paper roll in which the core portion is not loosely loosened, and a coreless toilet paper roll using the coreless toilet paper roll.

In order to solve the above-mentioned problem, as the present invention according to claim 1, when starting to wind the front end portion of the toilet paper around the take-up shaft, it is separated from the take-up shaft by a predetermined distance in the normal direction and parallel to the take-up shaft. Water is sprayed from the nozzles arranged in parallel at predetermined intervals along the direction to spray the toilet paper wound on the take-up shaft, and the winding is started at the same time. After a predetermined time has elapsed, the water spray is stopped and then continued. In the method of manufacturing a toilet paper roll that winds up toilet paper,
The distance from the nozzle to the surface of the take-up shaft is set so that the overlap margin of the projection width in the take-up shaft direction with respect to the take-up shaft surface of the spray water between adjacent nozzles is 35 mm to 57 mm. The spraying time from 0.2 to 1.2 seconds, and the winding length necessary for forming the core portion formed in the central cavity of the toilet paper roll is 2.0 m or less A method for producing a coreless toilet paper roll is provided.

  In the first aspect of the invention, the distance from the nozzle to the surface of the take-up shaft is such that the overlap margin of the projection width in the take-up shaft direction with respect to the take-up shaft surface of the spray water between adjacent nozzles is 35 mm to 57 mm. And the spraying time from the nozzle is set to 0.2 seconds to 1.2 seconds. With this configuration, the core portion formed in the central cavity portion of the toilet paper roll can be formed. It becomes possible to obtain a coreless toilet paper roll having a required winding length of 2.0 m or less and having no loosening at the core portion. In the case of the above manufacturing method, the winding length required for forming the core portion can be made shorter than that of the conventional product, and waste can be reduced. In addition, quality can be improved without large-scale equipment changes. Furthermore, since no special aqueous solution is used, the contamination of the facilities is prevented and the operation can be stabilized.

  As a second aspect of the present invention, there is provided the method for producing a coreless toilet paper roll according to the first aspect, wherein a projection width in the direction of the take-up shaft with respect to the take-up surface of the spray water is 149 mm to 171 mm.

  In the invention according to the second aspect, the projection width in the take-up shaft direction with respect to the take-up shaft surface of the spray water is 149 mm to 171 mm. Thereby, the projection of the water to other than a required part comes to be suppressed.

  As a third aspect of the present invention, the winding speed of the winding shaft is 25 ± 2 m / min, and the spray length in the paper winding direction of the spray water is 0.13 m to 0.47 m. 1.2 A method for producing a coreless toilet paper roll according to any one of the above is provided.

  In the invention described in claim 3, the winding speed of the winding shaft is 25 ± 2 m / min, and the spray length in the paper winding direction of the spray water is 0.13 m to 0.47 m. . Since the circumferential length of the winding shaft is 109 mm to 130 mm, by setting the spray length to at least one round + α, it is possible to prevent the winding core from being loosened without being sprayed with spray water. Become.

  As a fourth aspect of the present invention, the nozzle is a two-fluid nozzle of water and air, the spray pressure of water is 0.18 ± 0.05 MPa, and the spray pressure of air is 0.25 ± 0. The method for producing a coreless toilet paper roll according to any one of claims 1 to 3, wherein the pressure ratio is 05 MPa, and the ratio of water pressure: air pressure is 1: 1.1 to 1: 1.7.

  In the invention of claim 4, the nozzle is a two-fluid nozzle of water and air, the water spray pressure is 0.18 ± 0.05 MPa, the air spray pressure is 0.25 ± 0.05 MPa, And it sets so that the ratio of water pressure: air pressure may be set to 1: 1.1-1: 1.7. By satisfying this condition, the diameter of the water particles of the spray water can be approximately 10 to 30 μm (in the conventional case, approximately 40 to 60 μm), and the fine water particles can be uniformly applied to the toilet paper. It becomes possible, and generation | occurrence | production of the wrinkle in a center part can be suppressed now.

As the present invention according to claim 5, a coreless toilet paper roll in which a core portion in which a plurality of layers of toilet paper are bonded to each other and hardened is formed in the central cavity portion of the toilet paper roll,
The coreless toilet paper roll manufactured by the method for manufacturing a coreless toilet paper roll according to claim 1, wherein a winding length necessary for forming the core portion is 2.0 m or less. Is done.

  As described above in detail, according to the present invention, in the coreless toilet paper roll that forms the core portion at the winding start portion of the toilet paper, waste of the toilet paper is eliminated by shortening the winding length necessary for forming the core. At the same time, it is possible to obtain a coreless toilet paper roll in which the core portion is not loosely loosened.

It is a perspective view of a coreless toilet paper roll. It is the schematic of a manufacturing apparatus. This is a manufacturing procedure (part 1). It is a manufacturing procedure (the 2). It is a manufacturing procedure (the 3). It is a manufacturing procedure (the 4). The spray water projection part is shown, (A) is a sectional view, (B) is a plan view seen from a plane parallel to the projection direction. A case where the spray distance is excessively shown is schematically shown. (A) is a spray water projection diagram, (B) is a spray water projection distribution diagram, and (C) is a water density distribution diagram in the width direction. A case where the spray distance is too small is schematically shown. (A) is a spray water projection diagram, (B) is a spray water projection distribution diagram, and (C) is a water density distribution diagram in the width direction. A case where the spray distance is appropriate is schematically shown. (A) is a spray water projection diagram, (B) is a spray water projection distribution diagram, and (C) is a water density distribution diagram in the width direction. It is a perspective view which shows the test point of roll pressure strength.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[Coreless toilet paper roll]
In the coreless toilet paper roll 1 according to the present invention, a core portion 1a in which a plurality of layers of toilet paper are bonded to each other by hydrogen bonding and solidified is formed in a central cavity portion of the toilet paper roll 1. In the present invention, the winding length of the paper forming the core portion 1a is 2.0 m or less, preferably 1.0 m or less, and the core portion is not largely loosened. This is a condition.

  The toilet paper roll 1 may be a single ply consisting of a single layer, a two ply consisting of two layers, and a three ply consisting of three layers.

  The pulp fibers constituting the toilet paper include, for example, wood pulp, non-wood pulp, synthetic pulp, waste paper pulp, and the like, more specifically, groundwood pulp (GP), stone ground pulp (SGP), refiner. Mechanical pulp (MP) such as ground pulp (RGP), pressurized groundwood pulp (PGW), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), bleach chemithermomechanical pulp (BCTMP), chemical mechanical pulp ( Kraft pulp (KP) such as CGP), semi-chemical pulp (SCP), hardwood bleached kraft pulp (LBKP), softwood bleached kraft pulp (NBKP), soda pulp (AP), sulfite pulp (SP), dissolving pulp ( DP) and other chemical pulp (CP), nylon, rayo Synthetic pulp made from polyester, polyvinyl alcohol (PVA), deinked pulp (DIP), waste paper pulp such as waist pulp (WP), ground pulp (TP), cotton, flax, hemp, jute, manila hemp, ramie It is possible to select one or several kinds of rag pulp, straw pulp, esparto pulp, bagasse pulp, bamboo pulp, kenaf pulp and other auxiliary pulps such as bast pulp, etc. it can. Wood pulp is preferable, and it is desirable to use hardwood bleached kraft pulp (LBKP) and softwood bleached kraft pulp (NBKP). It is desirable that it is 100% wood pulp that does not contain waste paper pulp. In each layer or any one of the layers, if necessary, an appropriate agent such as a dispersant, caustic soda, a pH adjuster, an antifoaming agent, an antiseptic, a fluorescent dye, a mold release agent, a water resistant agent, a flow modifier, a yield improver, etc. Chemicals can be added.

The toilet paper roll 1 has a roll diameter of 100 to 119 mm, a tsubo (JIS P 8124 compliant) of 15 to 20 g / m ² , and a longitudinal paper strength (JIS P 8111 compliant) of 280 to 600 cN, horizontal The paper strength in the direction (conforming to JIS P 8111) is 50 to 200 cN.

〔Production method〕
As shown in FIG. 2, the coreless toilet paper roll 1 includes two take-up rolls 5A and 5B. The toilet paper 4 is fed from the raw fabric 2 placed on the two feed rollers 3A and 3B. It is manufactured by being wound on the peripheral surface of the winding shaft 6 located in the middle upper part of the. The upper part of the coreless toilet paper roll 1 is pressurized by a rider roll 7. Further, the winding shaft 6 is wound around the winding shaft 6 from the nozzles 8, 8... Separated from the winding shaft in the normal direction by a predetermined distance L ₁ and arranged in parallel at a predetermined interval along the direction parallel to the winding shaft 6. It is installed so that water is sprayed toward the toilet paper 4 placed.

  As the nozzle 8, a two-fluid nozzle of water and air is preferably used. When the water spray pressure and the air spray pressure are made equal, the water spray pressure is set to about 0.18 ± 0.05 MPa, and the air spray pressure is set to about 0.18 ± 0.05 MPa. In this case, the particle size of the spray water is approximately 40 to 60 μm. Also, if you want to suppress the generation of wrinkles by setting the water particle diameter of the spray water to approximately 10-30 μm, the water spray pressure is 0.18 ± 0.05 MPa and the air spray pressure is 0.25 ± 0.05 MPa. And the ratio of water pressure: air pressure is set to 1: 1.1-1: 1.7.

  The winding shaft 6 has a diameter of 35 to 41 mm and a circumference of 109 to 130 mm. The winding shaft 6 is rotated at a rotational speed of 25 ± 2 m / min.

  Specifically, as shown in FIG. 3, the sheet 4 from the raw fabric 2 is protruded laterally from the winding roll 5 </ b> B via the winding shaft 6. In addition, the rider roll 7 is abbreviate | omitted in the procedure figure of FIGS.

  Next, as shown in FIG. 4, air is ejected from the air ejection nozzle 9 disposed on the side of the winding roll 5 </ b> B, and the protruding sheet portion 4 a is folded back to the opposite side so as to wind the winding shaft 6. Then, as shown in FIG. 5, spray water is sprayed from the nozzle 8 toward the take-up shaft 6, the spray water is projected onto the protruding sheet portion 4a, and winding is started at the same time. 6 is stopped, the winding is continued, and as shown in FIG. 6, after the toilet paper roll 1 wound around the winding shaft 6 is formed, the winding shaft 6 is reduced and pulled out, and then the toilet paper is removed. The roll 1 is cut into predetermined dimensions in the axial direction.

[Projection of spray water]
In accordance with the present invention, the projection from the nozzle 8 of the spray water (spray distance of Figure 7: L ₁ dimension) distance from the nozzle 8 to the surface of the winding shaft 6 is between adjacent nozzles 8,8 (diffusion length in Figure 7: _{L 4} dimensions) spraying water take-up shaft 6 winding axis direction of the projection width to the surface of the facing area (wrapping distance Figure 7: _{L 3} dimension) 35Mm～57mm, preferably 35mm~ The spraying time from the nozzle 8 is set to 0.2 seconds to 1.2 seconds, preferably 0.2 seconds to 0.3 seconds. The winding length necessary for forming the core part 1a formed in the central cavity of the paper roll 1 is 2.0 m or less, preferably 1.0 m or less. The spraying time of 0.3 seconds is set as the vicinity range since the later-described example has been found that the lower limit side of 0.2 seconds is desirable.

  In principle, if the spray water is applied evenly and in an appropriate amount evenly and uniformly, the winding length required for forming the core can be reduced and loosening of the core occurs greatly. Thus, a toilet paper roll 1 having a stable quality can be obtained.

For example, if the overlap cash L ₃ of the projection width L ₄ is too large, as shown in FIG. 8, unevenness occurs in the application of the water spray. Although FIG. 8 (C) is a diagram in which the distribution in the width direction of the water density in the graph, the overlapping generations L ₃ excessive results of the projection width L _4, together with the non-uniformity occurs in the water density, many water spray Therefore, the winding length necessary for forming the winding core part is inevitably long.

On the other hand, that may overlap cash L ₃ of the projection width L ₄ is too small, as shown in FIG. 9, portions the spray water is not projected occurs in the central portion between the nozzles 8, 8, the winding core portion Will be loosened and tend to wrinkle due to partial overcoating.

  On the other hand, when the spray water is set to an appropriate coating amount according to the present invention, as shown in FIG. 10, as can be seen from the distribution state of the water density in the width direction of FIG. As a result, spray water is uniformly applied without unevenness, and the amount of application is appropriate, so that the core portion is less likely to be loosened.

  8B, 9B, and 10B indicate the actual injection region because the injection port of the nozzle 8 has a slit shape. is there.

[Example 1]
In Example 1, L ₁ (mm) spray distance: 137 mm, L ₂ (mm) spray pitch: 114 mm, L ₃ (mm) lapping distance: 57 mm, L ₄ (mm) diffusion distance: 171 mm, spray angle θ ₁ ( °): 64 °, angle of attack θ ₂ (°): 20 °, spray pressure / water (MPa): 0.18 MPa, spray pressure / air (MPa): 0.18 MPa ) Was varied between 0.2 seconds and 2.0 seconds. The spray length (m) was calculated from the winding speed of the winding shaft 6 and the spread of spray water in the flow direction.

The evaluation was performed with three items of winding length (m) necessary for core formation, roll pressure resistance (N), and loosening evaluation of the core portion. The winding length (m) necessary for forming the core is the winding length of the core portion that cannot be used after being peeled off. The sheet is wound at a speed of 50 m / min and pulled out until it is detached from the roll holder or is torn off. Then, the weight of the remaining core part was measured, and the winding length was calculated from the rice tsubo and the roll width. The roll pressure strength (N) was measured by compressing the roll at a descending speed of 10 mm / min using FGS-100VC manufactured by Nidec Sympo Co., Ltd., and measuring the pressure at the first peak. If it is 100 N or more, it is considered acceptable (as shown in FIG. 11, the metal plate 9 of 120 mm × 40 mm is lowered at the above speed and the roll is compressed). As shown in Table 1, the unraveling evaluation of the core part was evaluated by visual judgment based on 0 to 1 for unraveling, 2 to 4 for o, and 5 to 10 for x.

As shown in Table 2, the overall evaluation was performed by combining the winding length (m) necessary for core formation and the loosening evaluation.

The above test results are shown in Table 3.

  In Table 3, three cases with spray times (seconds) of 0.2 seconds, 0.5 seconds, and 1.0 seconds are evaluated as “good” in the overall evaluation.

[Example 2]
In Example 2, the L ₁ (mm) spray distance was changed between 50 mm and 160 mm, and the spray angle θ ₁ (°) was changed in the range of 77 ° to 60 °. Along with this, the L ₃ (mm) wrapping distance varies between −34 mm and 72 mm, and the L ₄ (mm) diffusion distance varies between 80 mm and 186 mm. The spraying time (seconds) was fixed at 1.2 seconds with the conditions fixed at spraying pressure / water (MPa): 0.18 MPa and spraying pressure / air (MPa): 0.18 MPa.

The test results are shown in Table 4.

In Table 4, L ₃ (mm) lapping distance is evaluated as “good” in two cases of 35 mm and 43 mm.

Example 3
In Example 3, the L ₁ (mm) spray distance was changed between 50 mm and 160 mm, and the spray angle θ ₁ (°) was changed in the range of 77 ° to 60 °. Along with this, the L ₃ (mm) wrapping distance varies between −34 mm and 72 mm, and the L ₄ (mm) diffusion distance varies between 80 mm and 186 mm. The spraying time (seconds) was fixed at 0.2 seconds with the spraying pressure / water (MPa): 0.18 MPa and the spraying pressure / air (MPa): 0.18 MPa.

The test results are shown in Table 5.

In Table 5, L ₃ (mm) lapping distance is 4 cases in 35 mm to 57 mm, and the overall evaluation is ○.

[Summary of Examples 1-3]
From the results in Examples 1 to 3, the overlapping margin of the projection width of the winding axis direction with respect to the winding shaft 6 surface of the spray water between adjacent nozzles 8, 8 (L ₃ dimensions in FIG. 7) 35mm~ By making the range 57 mm, preferably 35 mm to 52 mm, and the spraying time from the nozzle 8 to be in the range 0.2 seconds to 1.2 seconds, the overall evaluation becomes ◯, and the intended purpose of the present invention is achieved. It has been found.

Example 4
In the fourth embodiment, the optimum water pressure: air pressure ratio of the two-fluid nozzle 8 is verified in order to suppress the occurrence of wrinkles at the center portion. In general, when a two-fluid nozzle is used, if the water spray pressure is the same, increasing the air spray pressure reduces the particle size of the water particles, allowing uniform application with fine water particles. It becomes.

The L ₁ (mm) spray distance was changed between 110 mm and 137 mm, and the spray angle θ ₁ (°) was changed in the range of 70 ° to 66 °. Along with this, the L ₃ (mm) wrapping distance varies between ₄₀ mm and 64 mm, and the L ₄ (mm) diffusion distance varies between 154 mm and 178 mm. Spray pressure / water (MPa): fixed at 0.18 MPa, and spray pressure / air (MPa) was changed between 0.15 and 0.35 MPa. The spraying time (second) was fixed at 0.2 seconds.

The above test results are shown in Table 6.

From Table 6, the overall evaluation is ◎ when the air spray pressure is in the range of 0.25 ± 0.05 MPa, and the overall evaluation is ◯ in cases where the L ₃ (mm) wrapping distance is other than 64 mm.

  When the water spray pressure is 0.18 and the air spray pressure is 0.20 to 0.30 MPa, the ratio of water pressure: air pressure is 1: 1.1 to 1: 1.7. In this case, the diameter of the water particles of the spray water is generally in the range of 10 to 30 μm.

  DESCRIPTION OF SYMBOLS 1 ... Toilet paper roll, 1a ... Core part, 2 ... Original fabric, 3A * 3B ... Feeding roller, 4 ... Toilet paper (sheet), 5A * 5B ... Winding roll, 6 ... Winding shaft, 7 ... Rider roll , 8 ... Nozzle, 9 ... Air injection nozzle

Claims (5)

When starting to wind the front end portion of the toilet paper around the winding shaft, the winding is separated from the winding shaft by a predetermined distance in the normal direction and from the nozzle arranged in parallel at a predetermined interval along the direction parallel to the winding shaft. In a method for manufacturing a toilet paper roll, in which water is sprayed toward a toilet paper wound around a take-up shaft and winding is started at the same time, and after a predetermined time has elapsed, water spraying is stopped and then the toilet paper is continuously wound. ,
The distance from the nozzle to the surface of the take-up shaft is set so that the overlap margin of the projection width in the take-up shaft direction with respect to the take-up shaft surface of the spray water between adjacent nozzles is 35 mm to 57 mm. The spraying time from 0.2 to 1.2 seconds, and the winding length necessary for forming the core portion formed in the central cavity of the toilet paper roll is 2.0 m or less A process for producing a coreless toilet paper roll characterized by the above.   2. The method for producing a coreless toilet paper roll according to claim 1, wherein a projection width in a winding axis direction with respect to the winding axis surface of the spray water is 149 mm to 171 mm.   The core according to any one of claims 1.2, wherein the winding speed of the winding shaft is 25 ± 2 m / min, and the spray length in the paper winding direction of the spray water is 0.13 m to 0.47 m. No toilet paper roll manufacturing method.   The nozzle is a two-fluid nozzle of water and air, the spray pressure of water is 0.18 ± 0.05 MPa, the spray pressure of air is 0.25 ± 0.05 MPa, and water pressure: air pressure The method for producing a coreless toilet paper roll according to any one of claims 1 to 3, wherein the ratio of the ratio is 1: 1.1 to 1: 1.7. A coreless toilet paper roll in which a core portion in which a plurality of layers of toilet paper are bonded to each other and hardened is formed in a central cavity portion of the toilet paper roll,
The coreless toilet paper roll manufactured by the method for manufacturing a coreless toilet paper roll according to claim 1, wherein a winding length necessary for forming the core portion is 2.0 m or less.

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