JP6127995B2 - Paper quality inspection method and manufacturing method of sanitary thin paper - Google Patents

Description

  The present invention relates to a method for inspecting the quality of sanitary thin paper. The present invention also relates to a method for manufacturing sanitary thin paper in which this paper quality inspection method is incorporated into a part of the process.

  Conventionally, sanitary thin paper such as tissue paper and toilet paper has been known. In general, sanitary thin paper is made by mixing hardwood pulp, softwood pulp, waste paper pulp, etc. as appropriate, or by adding softeners, wetting agents, and paper strength enhancers to these raw material pulps. It is said that paper quality can be obtained (for example, Patent Documents 1 and 2). In addition, in order to adjust the paper quality of sanitary thin paper, there is also known a method of smoothing the touch by adding a moisturizing agent or the like after making raw pulp (for example, Patent Document 3).

JP 2006-132051 A JP 2009-219562 A JP 2013-094238 A

  By the way, sanitary thin paper such as tissue paper and toilet paper can be used when wiping things that are wet or wiping things that have been dampened and dried. Many. In particular, normal sanitary thin paper is frequently used for wiping wet human skin.

  However, sanitary thin paper with poor paper quality is easy to release the twisted fiber bundle when it is rubbed against the human skin or the surface of an article in the presence of moisture. There is a risk of sticking to the surface of the article and remaining. Such poor paper quality is difficult to detect at the manufacturing stage of sanitary thin paper, and may be detected only when used by consumers. If you provide sanitary thin paper with poor paper quality to consumers, you will be subject to complaints and you may have to collect the sanitary thin paper you sold.

  However, in the conventional manufacturing method of sanitary thin paper, a technique and a method for detecting a paper quality defect of sanitary thin paper have not been studied. Accordingly, an object of the present invention is to provide an inspection method capable of appropriately inspecting a paper quality defect in which a twisted fiber bundle is detached in one process of manufacturing sanitary thin paper.

  The inventor of the present invention, as a result of diligent research on means for solving the above problems, prepared a test plate on which a plurality of protrusions were formed, and pushed moisture-containing sanitary thin paper (test paper) onto the test plate. It was decided to measure the moving distance at which the twisted fiber bundles start to occur. As a result, it is possible to find a sanitary thin paper with poor paper quality that is likely to generate fiber bundles in a normal usage method, and obtain knowledge that only sanitary thin paper with good paper quality can be provided to consumers. It was. 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.

The first aspect of the present invention relates to a method for inspecting the paper quality of sanitary thin paper.
In this paper quality inspection method, first, a test plate 10 provided with a plurality of protrusions 12 extending in parallel to the surface of a flat substrate 11 is prepared. In addition, a test paper 21 is prepared in which moisture is contained in the sanitary thin paper 20 to be inspected. Thereafter, the test paper 21 is pressed against the test plate 10 and moved in a direction orthogonal to the plurality of convex portions 12. Then, when it is confirmed that the fiber bundle 22 is detached from the test paper 21 and remains on the test plate 10, the moving distance of the test paper 21 is measured.

  Accordingly, for example, when the distance at which the fiber bundle 22 starts to be detached from the inspection paper 21 is less than the reference distance with a predetermined moving distance as a reference, it is determined as “paper quality defect”. It can be judged that the paper quality is good. For example, the test paper 21 may measure the number of reciprocating movements of the test plate 10 until the fiber bundle 22 is detached by reciprocating the test plate 10. In addition, the test plate 10 is provided with unevenness similar to that of human skin, particularly assuming the unevenness of human skin. Further, the inspection paper 21 is in a wet state assuming that the consumer actually uses it. For this reason, the paper quality of the test paper 21 can be evaluated under conditions closer to the actual use state of sanitary thin paper.

  In the inspection method of the present invention, each of the plurality of protrusions 12 preferably has a width of 10 mm to 50 mm and a thickness of 0.5 mm to 5 mm.

  As described above, the convex portion 12 provided on the test plate 10 has a width of 10 to 50 mm, a thickness of 0.5 to 5 mm, and is formed wide and thin. For example, the convex portion 12 can be formed by bonding a vinyl tape or the like to the surface of the substrate 11. Thus, in this invention, the state of the test board 10 is set to the condition close | similar to human skin by forming the thin wide convex part 12 in the test board 10. FIG. Thereby, a more appropriate test result can be obtained.

  In the inspection method of the present invention, it is preferable that the surface of the plurality of convex portions 12 has a larger coefficient of static friction with the inspection paper 21 than the surface of the substrate 11.

  As described above, when the test paper 21 is rubbed onto the test plate 10 by increasing the static friction coefficient of the surface of the convex portion 12, the portion of the test paper 21 having a large friction coefficient (the surface of the convex portion 12). And a portion having a small friction coefficient (the surface of the substrate 11) are alternately contacted. As a result, the fiber bundle 22 starts to be generated from the test paper 21 relatively early, so that the paper quality test can be completed efficiently.

The second aspect of the present invention relates to a method for producing sanitary thin paper.
The manufacturing method of the present invention includes a step of inspecting the paper quality of the sanitary thin paper 20. In the paper quality inspection step, first, a test plate 10 provided with a plurality of protrusions 12 extending in parallel to the surface of the flat substrate 11 is prepared. In addition, a test paper 21 is prepared in which moisture is contained in the sanitary thin paper 20 to be inspected. Thereafter, the test paper 21 is pressed against the test plate 10 and moved in a direction orthogonal to the plurality of convex portions 12. Further, when it is confirmed that the fiber bundle 22 is detached from the test paper 21 and remains on the test plate 10, the moving distance of the test paper 21 is measured. Then, when the movement of the inspection paper 21 at the time when the separation of the fiber bundle 22 is confirmed is greater than or equal to a predetermined value, it is determined that the paper quality of the sanitary thin paper 20 satisfies a desired condition.

  As described above, by incorporating the paper quality inspection process in the final stage of the method for manufacturing sanitary thin paper, the paper quality of the test paper 21 can be evaluated under conditions close to the actual usage state of the sanitary thin paper. This can reduce the possibility of providing sanitary thin paper with poor paper quality to consumers.

It is preferable that the manufacturing method of the present invention further includes a step of folding a plurality of sanitary thin paper sheets 20 so that they can be successively drawn out and packed in a packaging box 30. Moreover, it is preferable that the manufacturing method of this invention includes the process of test | inspecting the amount of paper dust generation of the some sanitary thin paper 20 packed in the packaging box 30. FIG.
Here, in the step of inspecting the amount of generated powder, first, a certain number of sanitary thin paper sheets 20 are continuously drawn out from the packaging box 30 within a certain time. Thereafter, the paper dust remaining around the packaging box 30 is collected and the amount of paper dust is measured. Then, when the collected paper dust amount is a predetermined value or less, it is determined that the paper dust generation amount of the sanitary thin paper 20 satisfies a desired condition.

  As described above, in addition to the inspection of the paper quality related to the generation of the fiber bundle, by checking the amount of paper dust generated from the sanitary thin paper, it is possible to provide the sanitary thin paper with more suitable performance to the consumer. . In particular, in the inspection of the amount of paper dust generated, the amount of paper dust generated when taking out the tissue paper from the packaging box (tissue box) is measured assuming the actual use conditions of the tissue paper. Therefore, the amount of paper dust generated from tissue paper can be evaluated under conditions that are closer to the actual usage state.

  According to the present invention, in the final stage of the manufacture of sanitary thin paper, it is possible to appropriately inspect the paper quality such that the twisted fiber bundle is detached. Therefore, only sanitary thin paper with good paper quality can be provided to consumers, and it is possible to reduce complaints from consumers and improve consumer satisfaction.

FIG. 1 is a schematic diagram for explaining a paper quality inspection method. FIG. 2 is a schematic diagram for explaining a paper dust generation amount inspection method.

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.
In this specification, “A to B” means “A to B”.

  The present invention relates to a method for measuring the quality of sanitary thin paper and the amount of paper dust generated in the final process of sanitary thin paper. Sanitary tissue paper includes tissue paper, toilet paper, and kitchen paper. The sanitary thin paper can be manufactured by appropriately adopting known techniques for other processes except for the process of measuring the paper quality and the process of measuring the amount of paper dust generated.

  For example, to manufacture sanitary thin paper, first, the base paper is manufactured. The base paper can be produced by papermaking chemical pulp obtained by digesting wood chips such as softwood chips and hardwood chips, and raw pulp containing used paper pulp obtained from used paper. The composition of the raw material pulp for producing the base paper (the content of hardwood pulp, softwood pulp, and waste paper pulp) can be appropriately adjusted according to the type and use of sanitary thin paper. In the production of base paper, chemicals such as a softening agent, a wetting agent, and a paper strength enhancer can be added to the raw material pulp. In the process of making raw pulp, the fiber is crushed to form a paper layer, the paper layer is dried to remove moisture, and the base paper from which moisture has been removed is wound with a reel to form an original fabric roll. To do. It is also possible to feed one end of the base paper wound around the raw roll, superimpose it on the base paper fed from the other raw roll, and superimpose it on a plurality of layers, and then rewind it into a roll. The base papers stacked in one or more layers as described above are processed according to uses such as tissue paper and toilet paper, respectively.

  When processing the base paper into tissue paper, the raw roll is cut to form a plurality of rolls, and each roll is arranged for the number of product pairs. For example, when 200 sets of tissue paper are stored in one packaging box (tissue box) as a product, 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. Each bundle of tissue paper is boxed and shipped in a packaging box (tissue box).

  Also, when processing the base paper into toilet paper, the base paper is fed out from the raw 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 are packaged and shipped as a set.

  The above process is a basic process for producing sanitary thin paper, but other known techniques such as applying a moisturizer or printing on the base paper can be applied as appropriate. is there.

  The present invention includes a step of inspecting the paper quality of sanitary thin paper obtained according to the above-described known method. FIG. 1 is a schematic diagram showing an outline of the paper quality inspection process of the sanitary thin paper 20. FIG. 1A shows a state before starting the paper quality inspection. FIG.1 (b) has shown the side surface of the test board used by a paper quality test | inspection. FIG. 1C shows a state after the paper quality inspection is completed.

  As shown in FIG. 1A, in the paper quality inspection process, first, a test plate 10 used for paper quality inspection and an inspection paper 21 that is a paper quality inspection target are prepared.

  The test plate 10 has a structure in which a plurality of protrusions 12 are provided on the surface of a flat substrate 11. As the substrate 11, a plastic plate or a metal plate having a smooth surface can be used. Further, as shown in FIG. 1, the plurality of protrusions 12 are arranged in parallel, and all extend in the same direction. It is preferable that the intervals between the convex portions 12 are all equal. As shown in FIG. 1B, each convex portion 12 has a constant width (W) and a constant thickness (T). The width W of the convex portion 12 is preferably 10 to 50 mm, and particularly preferably 15 to 30 mm. Further, the thickness T of the convex portion 12 is preferably 0.5 to 5 mm, and particularly preferably 1 mm to 3 mm. Thus, the convex part 12 has a thin and flat shape. Each convex part 12 can also be formed by sticking a commercially available vinyl tape on the surface of the substrate 11, for example. It is preferable that the number of the convex parts 12 is 3-30, and it is especially preferable that it is 5-15.

  Further, it is preferable that the surface of the convex portion 12 has a larger coefficient of static friction with the surface of the test paper 21 than the surface of the substrate 11. For example, the static friction coefficient on the surface of the convex portion 12 is preferably 0.20 to 0.90, and particularly preferably 0.40 to 0.60. On the other hand, the coefficient of static friction on the surface of the substrate 11 may be less than the surface of the convex portion 12. For example, the convex portion 12 is preferably formed of a flexible material such as rubber or silicone. Specifically, as the flexible material, it is preferable to employ a synthetic resin such as polyethylene or polypropylene, or a rubber material such as an elastomer, synthetic rubber, or natural rubber. By forming the convex portion with such a material, the static friction coefficient of the convex portion can be brought close to the condition of human skin.

The static friction coefficient may be measured according to JIS P 8147 (1998).
Specifically, the static friction coefficient can be measured by the following method.
(1) The material which comprises a convex part is formed in 50 mm square, and it sticks on an inclined plate as a test piece.
(2) Cut the test paper into 50 mm squares to make test paper, and wrap it around a 200 g contact. In addition, a contact member around which a test piece of test paper is wound is placed on a test piece having a convex portion attached to an inclined plate. At this time, the pressure applied to the convex test piece is 0.48 kPa.
(3) Tilt the inclined plate at 6 degrees / second from the horizontal state and measure the angle at which the contact slides.
(4) The above angle is measured five times, and the average angle is calculated. The tangent value of the calculated average angle is taken as the coefficient of static friction.

  On the other hand, the inspection paper 21 is a state in which moisture is contained in the sanitary thin paper 20 to be inspected. In order to obtain the inspection paper 21, the entire sanitary thin paper 20 may be lightly wetted. For example, when the weight of the inspection paper 21 is 100%, the inspection paper 21 may be impregnated with water having a weight of 50 to 300%. As the test paper 21, it is preferable to use a sanitary thin paper 20 impregnated with water and slightly rolled.

The inspection paper 21 is moved in a direction orthogonal to the extending direction of the convex portion 12 while being pressed against the test plate 10. The inspection paper 21 is preferably one that reciprocates on the test plate 10. Moreover, it is preferable that the pressure when pressing the test paper 21 against the test plate 10 is a value close to the pressure when a person wipes his / her skin with sanitary thin paper. For example, the pressure at which pressing the test paper 21 on the test board 10 is preferably in the range of 0.3kg~3kg / cm ^2, and particularly preferably in the range of 0.8kg~2kg / cm ² . The speed at which the test paper 21 reciprocates on the test plate 10 is preferably a value close to the speed at which a person wipes his / her skin with sanitary thin paper. For example, the moving speed of the inspection paper 21 is preferably 20 to 100 cm / second, and preferably 40 to 160 cm / second.

  The operation of pressing and moving the inspection paper 21 against the test plate 10 may be performed automatically by a machine or manually by a hand. When the inspection paper 21 is moved manually, care should be taken so that conditions such as pressure and moving speed are as similar as possible.

  As shown in FIG. 1C, when the work of pressing the test paper 21 against the test plate 10 and reciprocating is repeatedly performed, the fiber bundle 22 twisted from the test paper 21 gradually begins to be detached. At this time, the moving distance of the inspection paper 21 when the separation of the fiber bundle 22 from the inspection paper 21 can be confirmed first is recorded. When the moving distance until the fiber bundle 22 is detached is not less than a desired value, the inspection paper 21 passes the inspection. On the other hand, when the moving distance until the fiber bundle 22 is detached is less than a desired value, the inspection paper 21 fails the inspection. The acceptance criteria for the travel distance can be set to any value as appropriate according to the paper quality required by the manufacturer for sanitary thin paper.

  Further, the acceptance criterion of the inspection paper 21 can be the number of reciprocating movements instead of the movement distance. Even if the acceptance criterion is set as the number of reciprocating movements, it can be said that it is substantially equivalent to using the movement distance as the acceptance criterion. For example, when the length of the test plate 10 (the length in the direction orthogonal to the extending direction of the convex portion 12) is short, it is easier to perform the inspection by determining whether or not the test paper 21 is acceptable based on the number of reciprocating movements. It can be said.

  As described above, by evaluating the quality of the test paper 21 of the sanitary thin paper 20 using the test plate 10, it is possible to appropriately determine whether or not the standard for manufacturing and selling the sanitary thin paper 20 is reached. And in the manufacturing method of sanitary thin paper, only the sanitary thin paper manufactured on the same conditions as the sanitary thin paper which passed the said paper quality inspection test should just be made into a final product. On the other hand, sanitary thin paper manufactured under the same conditions as sanitary thin paper that failed the paper quality inspection test may be discarded, improved, or recycled without final products.

  Next, the present invention includes a step of inspecting the amount of paper dust generated for sanitary thin paper obtained according to a known method. In particular, the inspection process of the amount of paper dust generated can be suitably applied to a method for manufacturing tissue paper that is sold in a packaging box (tissue box). FIG. 2 is a schematic diagram showing an outline of a process for inspecting the amount of paper dust generated from the sanitary thin paper 20.

  As shown in FIG. 2, a plurality of sanitary thin paper sheets 20 are stacked and packed in a packaging box 30. The plurality of sanitary thin papers 20 are folded in the packaging box 30 so that when one sheet is taken out of the packaging box 30, the next sheet comes out of the packaging box 30. A method of folding a plurality of sanitary thin papers 20 is known. Further, as the packaging box 30, for example, as shown in FIG. 1, an outlet 31 is formed on the top surface portion, and a film 32 having a slit is attached to the outlet 31. May be used.

  In order to inspect the amount of paper dust generated from the sanitary thin paper 20, first, as shown in FIG. 2, the packaging box 30 in which the sanitary thin paper 20 to be inspected is placed is placed on the mount 40. At this time, the packaging box 30 is preferably installed with the outlet 31 sideways. The packaging box 30 is preferably held by hand so as not to fall or fixed on the mount 40. In addition, as shown in FIG. 2, in order to increase the position of the packaging box 30 to be inspected, the same packaging box 30 can be overlapped and the upper packaging box 30 can be the inspection object.

  The mount 40 is a member laid under the packaging box 30 in order to collect paper dust generated from the sanitary thin paper 20. The mount 40 preferably uses a dark color in order to make the paper dust easy to see. As the mount 40, for example, cardboard or a plastic sheet can be used.

  Further, in order to easily collect paper dust generated from the sanitary thin paper 20, a charging sheet capable of charging static electricity may be used as the mount 40. An example of a charged sheet is a plastic sheet that is easily charged with static electricity. Further, as the charging sheet, a metal sheet that generates static electricity that adsorbs paper dust by applying a voltage can be used. For example, when starting the operation of taking out the sanitary thin paper 20 from the packaging box 30, a voltage is applied to the metal sheet to generate static electricity, and after removing the sanitary thin paper 20 from the packaging box 30, the voltage inker is released. If the generation of static electricity is stopped, paper dust generated from the sanitary thin paper 20 can be easily collected.

  In addition, a metronome 50 may be prepared for checking the amount of paper dust generated. As the metronome 50, a commercially available product can be used.

  When the above preparation is completed, the inspection of the amount of paper dust generated from the sanitary thin paper 20 is started. In the inspection of the amount of generated paper dust, first, a work of continuously drawing out a certain number of sanitary thin paper 20 from the packaging box 30 within a certain time is performed. For example, the fixed time is preferably 20 to 90 seconds, and particularly preferably 30 to 60 seconds. Further, the fixed number is preferably 30 to 200, particularly preferably 60 to 120. For example, if 200 sanitary thin papers 20 are folded and stored in the packaging box 30, 120 sanitary thin papers 20 may be pulled out in 60 seconds. Thus, by making the number and time of drawing out the sanitary thin paper 20 constant, the sanitary thin paper 20 can be continuously taken out from the packaging box 30 at substantially the same pace and at the same speed. Such an operation of pulling out the sanitary thin paper 20 may be performed automatically by a machine, or may be manually performed manually.

  For example, when the sanitary thin paper 20 is pulled out manually, it is preferable to use the metronome 50. By using the metronome 50, it becomes easy to continue pulling out the sanitary thin paper 20 at approximately the same pace and at the same speed even by hand. For example, the metronome 50 may be set to sound at a pace of 120 times within 60 seconds.

  As described above, after a certain number of sanitary thin paper sheets 20 have been pulled out from the packaging box 30 within a certain time, the paper dust remaining on the mount 40 is collected and the amount of the paper dust is measured. The amount of paper dust may be measured by measuring the weight of paper dust remaining on the mount 40, or counting the number of paper dust remaining on the mount 40. A known device can be used to measure the weight and number of paper dust.

  And when the amount of paper dust measured as mentioned above is below a predetermined value, it can be judged that the amount of paper dust generated of the sanitary thin paper 20 satisfies a desired condition (acceptance criteria). . On the other hand, when the amount of paper dust exceeds a predetermined value, it is determined that the amount of paper dust generated on the sanitary thin paper 20 does not satisfy a desired condition (acceptance criteria). For example, the acceptance criterion for the amount of paper dust generated can be 1 to 30 g, 5 to 25 g, or 15 g to 20 g, based on the weight of the paper dust. However, the acceptance criteria for the amount of paper dust generated can be appropriately set to an arbitrary value according to the property required by the manufacturer for sanitary thin paper.

  As described above, by evaluating the amount of paper dust generated from the sanitary thin paper 20, it is possible to appropriately determine whether or not the standard for manufacturing and selling the sanitary thin paper 20 is reached. And in the manufacturing method of sanitary thin paper, only the sanitary thin paper manufactured on the same conditions as the sanitary thin paper which passed the said paper dust generation amount test should just be made into a final product. On the other hand, sanitary thin paper manufactured under the same conditions as the sanitary thin paper that failed the paper dust generation test described above may be discarded, improved, or recycled without becoming a final product.

  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.

  The present invention relates to a paper quality inspection method performed in the manufacturing process of sanitary thin paper. Therefore, the present invention can be suitably used in the sanitary thin paper manufacturing industry.

DESCRIPTION OF SYMBOLS 10 ... Test board 11 ... Board | substrate 12 ... Convex part 20 ... Sanitary thin paper 21 ... Inspection paper 22 ... Fiber bundle 30 ... Packaging box 31 ... Outlet 32 ... Film 40 ... Mount 50 ... Metronome

Claims (5)

A method for inspecting the quality of sanitary thin paper,
A test plate (10) provided with a plurality of protrusions (12) extending in parallel to the surface of the flat substrate (11) is prepared,
Prepare a test paper (21) containing moisture in the sanitary thin paper (20) to be inspected,
The test paper (21) is pressed against the test plate (10) and moved in a direction perpendicular to the plurality of protrusions (12),
Measuring the moving distance of the test paper (21) at the time when it was confirmed that the fiber bundle (22) was detached from the test paper (21) and remained on the test plate (10),
Paper quality inspection method. The plurality of protrusions (12) are:
The width is 10 mm or more and 50 mm,
The paper quality inspection method according to claim 1, wherein the thickness is 0.5 mm or more and 5 mm or less. The paper quality inspection method according to claim 1 or 2, wherein the surface of the plurality of protrusions (12) has a larger coefficient of static friction with the inspection paper (21) than the surface of the substrate (11). . A method of manufacturing sanitary thin paper,
Inspecting the paper quality of the sanitary thin paper (20),
The step of inspecting the paper quality includes:
A test plate (10) provided with a plurality of protrusions (12) extending in parallel to the surface of the flat substrate (11) is prepared,
Prepare a test paper (21) containing moisture in the sanitary thin paper (20),
The test paper (21) is pressed against the test plate (10) and moved in a direction perpendicular to the plurality of protrusions (12),
Measure the moving distance of the inspection paper (21) when it was confirmed that the fiber bundle (22) was detached from the inspection paper (21) and remained on the test plate (10),
When the moving distance of the inspection paper (21) at the time of confirming the detachment of the fiber bundle (22) is a predetermined value or more, it is determined that the paper quality of the sanitary thin paper (20) satisfies a desired condition. ,
Manufacturing method of sanitary thin paper. Folding a plurality of sanitary thin papers (20) so that they can be successively drawn out and packed in a packaging box (30);
And a step of inspecting a paper dust generation amount of the plurality of sanitary thin papers (20) packed in the packaging box (30),
The step of inspecting the amount of paper dust generated is as follows:
A predetermined number of the sanitary thin paper (20) is continuously pulled out from the packaging box (30) within a predetermined time,
Then, collect the paper dust remaining around the packaging box (30), measure the amount of paper dust,
When the amount of paper dust is a predetermined value or less, it is determined that the amount of paper dust generated from the sanitary thin paper (20) satisfies a desired condition.
The manufacturing method of the sanitary thin paper of Claim 4.

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