JP6946142B2 - Manufacturing method of coated material - Google Patents

Description

The present invention relates to an apparatus for manufacturing a coated product and a method for manufacturing the coated product, which coats the object to be coated with a liquid.

Recently, various absorbent articles such as disposable diapers coated with functional agents such as skin care agents and sanitary napkins have been proposed. For example, a skin care agent that is provided on a disposable diaper and covers an absorber that absorbs body fluids discharged by the wearer is coated with a skin care agent that can be transferred to the wearer's skin. Disposable diapers have been proposed that exert a skin care effect on the skin that comes into contact with the surface sheet portion.

As another technique, in Patent Document 1, the thickness of the card on which the ink image is transferred is measured by a card thickness measuring sensor, and the distance between the impression cylinders and the plate cylinder is changed based on the measured thickness of the card. An offset printing machine that adjusts the printing pressure of an ink image transferred to a card is disclosed.

Further, in Patent Document 2, the position of the plate cylinder on which the printing plate on which the pattern to be transferred is formed is mounted and the substrate on which the coating liquid of the pattern formed on the printing plate is transferred is determined by a non-contact displacement meter. A printing apparatus that detects and adjusts the distance between the printing plate and the substrate based on the detected position to adjust the printing pressure of the coating liquid on the substrate is disclosed.

Japanese Unexamined Patent Publication No. 2005-231165 Japanese Unexamined Patent Publication No. 2008-6705

By the way, in an object to be coated before the liquid is applied, such as an absorbent article to which a skin care agent is applied, if the thickness of each individual varies, the object to be coated is coated. There is a risk of poor coating of the liquid. For example, even if the distance between the coating roll on which the liquid is applied and the crimping roll for crimping the object to be coated to the coating roll is set in advance based on the target coating amount, the thickness of the object to be coated When is changed, the printing pressure when the object to be coated passes between the coating roll and the crimping roll changes. When the printing pressure changes, the amount of liquid applied to the object to be coated changes, which may cause poor coating.

However, in Patent Documents 1 and 2, a plate in which a printing plate is attached and a distance between a plate cylinder and an impression cylinder based on the thickness of an absorbent article provided with an absorber having a laminated structure in which the thickness of each individual tends to vary. Nothing is said about adjusting the distance between the torso and the substrate.

Further, since the offset printing machine described in Patent Document 1 uses a one-dimensional sensor as a card thickness measuring sensor for measuring the card thickness, at least two card thickness measuring sensors are required to measure the card thickness. Therefore, the device configuration becomes complicated. Similarly, since the one-dimensional sensor also uses the non-contact displacement meter of the printing apparatus described in Patent Document 2, at least two non-contact displacement meters are required to adjust the distance between the printing plate and the substrate. Further, since the one-dimensional sensor cannot measure the thickness distribution in the width direction orthogonal to the transport direction, for example, it is not possible to adjust the printing pressure corresponding to the thickness distribution.

Therefore, an object of the present invention is to provide a manufacturing apparatus and a method for manufacturing a coated product that can eliminate the drawbacks of the above-mentioned prior art.

The present invention comprises a coating roll in which the liquid to be coated is applied to the peripheral surface, and a crimping roll that is arranged to face the coating roll and crimps the object to be coated to the coating roll. An apparatus for manufacturing a coated object in which an object to be coated is passed between a work roll and the crimping roll to apply a liquid to the object to be coated, and the work to be coated is performed before the liquid is applied. 2 of the object to be coated, which has a detection unit including a two-dimensional displacement meter for measuring a two-dimensional profile of an object and a reference surface arranged to face the two-dimensional displacement meter, and is conveyed by the detection unit. The three-dimensional profile is continuously measured to obtain a three-dimensional shape profile, and based on the three-dimensional shape profile, the three-dimensional height profile from the reference plane to the irradiated surface of the object to be coated is obtained. A clearance changing portion for changing the clearance between the coating roll and the crimping roll, and the clearance changing portion for changing the clearance between the coating roll and the crimping roll based on the three-dimensional height profile acquired by the detecting portion. The present invention provides an apparatus for manufacturing a coated object, which has a printing pressure adjusting unit for adjusting the printing pressure when applying a liquid to the object to be coated.

The present invention also includes a coating roll in which the liquid to be coated is applied to the peripheral surface, and a crimping roll that is arranged to face the coating roll and crimps the object to be coated to the coating roll. A method for manufacturing a coated object in which a liquid is coated on the object to be coated by passing the object to be coated between the coating roll and the crimping roll, and is conveyed by using the two-dimensional displacement meter. The two-dimensional profile of the object to be coated is continuously measured to obtain a three-dimensional shape profile, and the three-dimensional height profile from the reference plane to the surface of the object to be coated on the irradiation side based on the three-dimensional shape profile. Based on the height profile detection step of acquiring the above and the three-dimensional height profile acquired in the height profile detection step, the clearances of the coating roll and the crimping roll are changed to liquid the object to be coated. The present invention provides a method for manufacturing a coated product, which comprises a printing pressure adjusting step for adjusting the printing pressure at the time of coating.

The present invention also includes a coating roll in which the liquid to be coated is applied to the peripheral surface, and a crimping roll that is arranged to face the coating roll and crimps the object to be coated to the coating roll. An apparatus for manufacturing a coated object in which an object to be coated is passed between a coating roll and the crimping roll to apply a liquid to the object to be coated, and the object to be coated is coated before the liquid is applied. It has a detection unit that includes a three-dimensional displacement meter that measures the three-dimensional displacement amount of the work piece and a reference surface that is arranged to face the three-dimensional displacement meter. The amount of displacement is measured to obtain a three-dimensional shape profile, and based on the three-dimensional shape profile, a three-dimensional height profile from the reference surface to the surface of the object to be coated on the irradiation side is acquired, and the coating roll is obtained. And the clearance changing part for changing the clearance of the crimping roll, and the clearance changing part for changing the clearance of the coating roll and the crimping roll based on the three-dimensional height profile acquired by the detecting part, and to be coated. It is an object of the present invention to provide a coating product manufacturing apparatus having a printing pressure adjusting unit for adjusting the printing pressure when applying a liquid to the work product.

The present invention also includes a coating roll in which the liquid to be coated is applied to the peripheral surface, and a crimping roll that is arranged to face the coating roll and crimps the object to be coated to the coating roll. A method for manufacturing a coated object in which a liquid is applied to the coated object by passing the object to be coated between the coating roll and the crimping roll, and the object to be coated is used by using a three-dimensional displacement meter. A height profile that obtains a three-dimensional shape profile by measuring the amount of three-dimensional displacement of the When the liquid is applied to the object to be coated by changing the clearance between the coating roll and the crimping roll based on the detection step and the three-dimensional height profile acquired in the height profile detection step. Provided is a method for manufacturing a coated product, which includes a printing pressure adjusting step for adjusting the printing pressure.

According to the coated object manufacturing apparatus of the present invention, the manufacturing apparatus can be simplified and the liquid can be uniformly applied to the objects to be coated having different thicknesses. Further, according to the method for producing a coated product of the present invention, it is possible to efficiently produce a coated product in which the liquid is uniformly coated on the coated product.

FIG. 1 is a schematic view showing a coating product manufacturing apparatus used in a method for manufacturing a coated product, which is a preferred embodiment of the present invention. FIG. 2 is a block diagram showing a configuration of the manufacturing apparatus shown in FIG. FIG. 3 is a schematic view showing a coating unit of the manufacturing apparatus shown in FIG. FIG. 4 is a graph showing the relationship between the clearance of the coating roll and the crimping roll and the coating amount of the liquid to be coated. FIG. 5 is a graph showing the relationship between the coating amount and the clearance of each of the plurality of absorbent articles having different thicknesses. FIG. 6 is a graph showing a relationship obtained by plotting the clearance at each thickness at the target coating amount from the relationship between the coating amount and the clearance of each of the plurality of absorbent articles shown in FIG. FIG. 7 is a diagram for explaining the determination of the thickness with respect to the clearance from the relationship obtained in FIG. FIG. 8 is a flowchart showing a clearance setting in a method for manufacturing an absorbent article coated with the skin care agent of the present embodiment.

Hereinafter, the present invention will be described based on a preferred embodiment thereof with reference to the drawings. First, the coating product manufacturing apparatus of the present invention will be described with reference to the drawings, taking as an example the coating product manufacturing apparatus 100, which is a preferred embodiment thereof.

As shown in FIGS. 1 and 3, the manufacturing apparatus 100 has a coating roll 21 on which the liquid to be coated is applied to the peripheral surface, and the coating roll 21 is arranged to face the coating roll 21 and is covered with the coating roll 21. A device including a crimping roll 22 for crimping a coated object, and a device for applying a liquid to the coated object by passing the object to be coated between the coating roll 21 and the crimping roll 22.

As shown in FIG. 2, the manufacturing apparatus 100 includes a two-dimensional laser displacement meter 11 as a two-dimensional displacement meter that measures the two-dimensional profile of the object to be coated before the liquid is applied, and the two-dimensional laser displacement. It has a detection unit 10 including a reference plane arranged to face the total of 11. In the manufacturing apparatus 100, the detection unit 10 continuously measures the two-dimensional profile of the object to be coated by irradiating the two-dimensional laser displacement meter 11 with the two-dimensional laser toward the object to be conveyed. Then, the three-dimensional shape profile of the object to be coated is acquired. Then, based on the acquired three-dimensional shape profile of the object to be coated, a three-dimensional height profile of the object to be coated from the reference plane to the surface of the object to be coated on the irradiation side is generated and acquired. Further, the manufacturing apparatus 100 has a clearance changing portion 23 that changes the clearance L of the coating roll 21 and the crimping roll 22, and a coating roll 21 and a coating roll 21 on the clearance changing portion 23 based on the three-dimensional height profile detected by the detection unit 10. It has a printing pressure adjusting unit 30 that adjusts the printing pressure when applying a liquid to the object to be coated by changing the clearance L of the crimping roll 22.

Examples of the liquid to be applied to the object to be coated include an adhesive such as a hot melt adhesive and a skin care agent. The hot melt adhesive is not particularly limited, but is, for example, styrene rubber such as styrene / butadiene / styrene block copolymer (SBS), styrene / ethylene / butylene / styrene block copolymer (SEBS), or amorphous poly. A hot melt adhesive such as an olefin polymer such as α-olefin (APAO) or ethylene vinyl acetate copolymer (EVA) can be used. As the adhesive other than the hot melt adhesive, for example, an adhesive such as low density polyethylene, polyvinyl acetate, silicon resin, glue or the like can be used. As the skin care agent, for example, plant extracts, collagen, natural moisturizing ingredients, moisturizers, oils, emulsions, lotions, keratin softeners, anti-inflammatory agents and the like described in Japanese Patent No. 4084278 can be used.

The viscosity of the liquid to be applied to the object to be coated is preferably 1 mPa · s or more, more preferably 10 mPa · s or more, and 10000 mPa · s or less from the viewpoint of efficiently applying the liquid to the object to be coated. Is preferable, and 8000 mPa · s or less is more preferable. Specifically, it is preferably 1 mPa · s or more and 10000 mPa · s or less, and more preferably 10 mPa · s or more and 8000 mPa · s or less. The viscosity of the liquid is measured at 20 ° C. and can be measured using a digital viscometer (viscometer TVB-10M (manufactured by Toki Sangyo Co., Ltd.), rotor N0.3, rotation speed: 30 rpm).

The object to be coated with the liquid is, for example, a sheet-like material made of a non-woven fabric, a woven fabric, a resin film, a knitting material, or the like, or a laminated body in which these sheet-like materials are laminated in two or more layers. Examples thereof include articles obtained by laminating or sandwiching other members on these sheet-like objects or laminated bodies. The object to be coated may be a continuous strip-shaped body, or may have a predetermined length, and a plurality of articles may be sequentially conveyed at predetermined intervals. Specific examples of the article include disposable diapers and absorbent articles such as sanitary napkins having an absorber that absorbs body fluids discharged by the wearer.

In the manufacturing apparatus 100 described below, the absorbent article 1 as the object to be coated is coated with the skin care agent 2 as a liquid, and the skin care agent 2 as the coated object is coated. 1 (hereinafter, also referred to as an absorbent article 3 after coating) is an apparatus for manufacturing.

As shown in FIGS. 1 and 2, the manufacturing apparatus 100 applies the skin care agent 2 to the detection unit 10 that detects the thickness of the absorbent article 1 and the absorbent article 1 whose thickness is detected by the detection unit 10. It includes a coating unit 20 to be worked on, and a printing pressure adjusting unit 30 for adjusting the printing pressure when the skin care agent 2 is applied to the absorbent article 1 by the coating unit 20. In the manufacturing apparatus 100, as shown in FIGS. 1 and 2, the detection unit 10 includes a displacement meter controller 13 and an image inspection device 14 in addition to the two-dimensional laser displacement meter 11 and the reference unit 12.

In the manufacturing apparatus 100, the two-dimensional laser displacement meter 11 is a reflection type two-dimensional laser displacement meter as shown in FIG. Specifically, the two-dimensional laser displacement meter 11 includes a light emitting element (not shown) that irradiates a band-shaped laser beam (two-dimensional laser) and a band-shaped laser light (2) that is irradiated by the light emitting element (not shown). It has a light receiving element (not shown) that receives the reflected light of the dimensional laser). In the manufacturing apparatus 100, by using the reflection type two-dimensional laser displacement meter 11, for example, the detection unit 10 can easily obtain the two-dimensional profile of the absorbent article 1. The two-dimensional profile referred to here refers to information on the contour shape in the width direction obtained by scanning the absorbent article 1 in the width direction.

The band-shaped laser light (two-dimensional laser) irradiated by the light emitting element (not shown) of the two-dimensional laser displacement meter 11 is preferably a laser light having a wavelength of 380 nm or more and 500 nm or less. The wavelength range of 380 nm or more and 500 nm or less is blue-purple to blue-green laser light, which has a shorter wavelength than the red laser light used for general measurement. Therefore, the light is accurately reflected even on a small uneven surface. The reflected light easily reaches the light receiving element. On the other hand, in the case of red laser light (for example, wavelength 620 nm or more and 750 nm or less), the reflected light tends to bleed. Therefore, in the case of a laser displacement meter that measures reflected light, the blue laser light can perform more accurate measurement than the red laser light.

In the manufacturing apparatus 100, the reference unit 12 is a transport belt 12 on which the absorbent article 1 is placed and conveyed, as shown in FIG. The transport belt 12 is formed so that the length in the width direction Y orthogonal to the transport direction X of the absorbent article 1 is longer than the length in the width direction Y of the absorbent article 1. In the manufacturing apparatus 100, by using the transport belt 12 as the reference unit, for example, it is not necessary to separately provide the reference unit below the absorbent article 1, and the detection unit 10 can have a simple configuration.

In the manufacturing apparatus 100, the displacement meter controller 13 is electrically connected to the two-dimensional laser displacement meter 11 as shown in FIG. In the manufacturing apparatus 100, the displacement meter controller 13 scans the absorbent article 1 transported to the transport belt 12 by using the two-dimensional laser displacement meter 11, and forms the absorbent article 1 so that the two-dimensional profile of the absorbent article 1 can be acquired. Has been done. Specifically, the displacement meter controller 13 irradiates the light emitting element (not shown) of the two-dimensional laser displacement meter 11 with a two-dimensional laser, and causes the light receiving element (not shown) to receive the reflected light. It is formed so that a two-dimensional profile regarding the width direction Y and the thickness direction Z of the absorbent article 1 can be acquired.

In the manufacturing apparatus 100, the image inspection apparatus 14 is electrically connected to the displacement meter controller 13 as shown in FIG. In the manufacturing apparatus 100, the image inspection apparatus 14 acquires the three-dimensional shape profile of the absorbent article 1 by using the plurality of continuous two-dimensional profiles acquired by the displacement meter controller 13. Further, in the manufacturing apparatus 100, the image inspection apparatus 14 can acquire the three-dimensional height profile by adding the height data with respect to the reference plane to the acquired three-dimensional shape profile. Further, in the manufacturing apparatus 100, the height distribution in the width direction Y of the coated surface of the absorbent article 1 being conveyed and the average thickness d of the coated surface are determined by using the three-dimensional height profile acquired by the image inspection apparatus 14. You can get it.

In the manufacturing apparatus 100, the coating unit 20 for applying the skin care agent 2 to the absorbent article 1 is arranged on the transport direction X downstream side of the absorbent article 1 with respect to the detection unit 10 as shown in FIG. As shown in FIG. 3, it has a coating roll 21, a crimping roll 22, and a clearance changing portion 23. The coating roll 21 and the crimping roll 22 are arranged in parallel with each other, and the clearance changing portion 23 moves one of the coating roll 21 and the crimping roll 22 to reduce the clearance L between the coating roll 21 and the crimping roll 22. change. In the manufacturing apparatus 100, one of the coating roll 21 and the crimping roll 22 is moved by the clearance changing portion 23 to change the clearance L. The adjustment can be easily performed.

In the manufacturing apparatus 100, the surface of the coating roll 21 is formed of an elastic material, and the coating roll 21 is formed so as to be elastically deformable. In the manufacturing apparatus 100, as shown in FIGS. 1 and 3, the rotating shaft 21s of the coating roll 21 is rotatably supported by the clearance changing portion 23, and the clearance changing portion 23 rotatably supports the absorbent article 1 in the thickness direction. It is formed so as to be movable in parallel with Z. In the manufacturing apparatus 100, the coating roll 21 is rotatably formed in the direction of arrow R1 shown in FIG. 2 by a drive source (not shown).

In the manufacturing apparatus 100, the crimping roll 22 is made of a metal material such as stainless steel or iron. As shown in FIG. 1, the crimping roll 22 is arranged below the coating roll 21 so as to face the coating roll 21. In the manufacturing apparatus 100, the crimping roll 22 has a rotating shaft 22s rotatably supported by a frame (not shown) of the coating unit 20, and the position is fixed by the frame (not shown) of the coating unit 20. ing. In the manufacturing apparatus 100, the crimping roll 22 is rotatably formed in the direction of arrow R2 shown in FIG. 2 by a drive source (not shown).

In the manufacturing apparatus 100, as shown in FIG. 3, the clearance changing portion 23 includes a pair of roll support portions 24R and 24L that rotatably support both ends of the rotation shaft 21s of the coating roll 21, and a pair of roll support portions 24R. , 24L has a pair of elevating support portions 25R and 25L for elevating and lowering 24L in the thickness direction Z of the absorbent article 1 passing between the coating roll 21 and the crimping roll 22.

As shown in FIGS. 1 and 3, the pair of roll support portions 24R and 24L are formed long in the vertical direction and are arranged substantially parallel to the vertical direction. The vertical direction referred to here is a direction parallel to the thickness direction Z (see FIG. 2) of the absorbent article 1 passing between the coating roll 21 and the crimping roll 22. The upper end of the pair of roll support portions 24R, 24L rotatably supports both ends of the rotating shaft 21s of the coating roll 21, and the lower end portion is attached to the nut portion 25n of the pair of elevating support portions 25R, 25L, which will be described later. It is attached. The pair of roll support portions 24R and 24L are vertically supported by the pair of elevating support portions 25R and 25L via the nut portions 25n of the pair of elevating support portions 25R and 25L.

In the manufacturing apparatus 100, each of the pair of elevating support portions 25R and 25L is arranged below the crimping roll 22, and the pair of rolls that rotatably support the coating roll 21 from below. Each of the support portions 24R and 24L is moved up and down in the vertical direction. Each of the pair of elevating support portions 25R and 25L is fixed to the frame (not shown) of the coating unit 20. In the manufacturing apparatus 100, each of the pair of elevating support portions 25R and 25L is formed by a ball screw. Specifically, in the manufacturing apparatus 100, each of the pair of elevating support portions 25R and 25L has a motor 25mt, a rotation transmission portion 25g, a screw shaft 25s, and a nut portion 25n, as shown in FIG. There is. The rotation transmission unit 25g is connected to the motor 25mt, and transmits the rotation of the motor 25mt to the screw shaft 25s. Further, the rotation transmission unit 25g is fixed to the frame (not shown) of the coating unit 20. The screw shaft 25s is connected to the rotation transmission portion 25g in parallel with the pair of roll support portions 24R and 24L, and is rotated by the rotational force of the motor 25mt transmitted via the rotation transmission portion 25g. The nut portion 25n is screwed into the screw shaft 25s and is fixed to the lower end portion of the roll support portion 24, and is moved up and down together with the roll support portion 24 by the rotation of the screw shaft 25s. ing. As the rotation transmitting portion 25 g, a gear, a timing belt, or the like is preferable.

As described above, in the manufacturing apparatus 100, the clearance changing portion 23 uses the coating roll 21 as a pair of elevating support portions 25R with respect to the crimping roll 22 whose position is fixed by the frame (not shown) of the coating unit 20. The clearance L between the coating roll 21 and the crimping roll 22 can be changed by moving it up and down together with the pair of roll support portions 24R and 24L at 25L. For example, the clearance changing portion 23 can change the clearance L by driving the motors 25mt of each of the pair of elevating support portions 25R and 25L by the same amount to raise and lower the coating roll 21 in parallel with the crimping roll 22. Further, the clearance changing portion 23 differently changes the driving amount of each motor 25 mt to independently change the clearance on one side in the width direction Y and the clearance on the other side in the width direction Y, respectively, and changes the crimping roll 22 and the coating. One of the rolls 21 can be tilted with respect to the other.

In the manufacturing apparatus 100, the printing pressure adjusting unit 30 is electrically connected to the detecting unit 10 and the coating unit 20 as shown in FIG. In the manufacturing apparatus 100, the coating roll 21 and crimping are applied to the clearance changing portion 23 based on the average thickness d of the coated surface of the absorbent article 1 of the absorbent article 1 acquired by the detection unit 10 by using the printing pressure adjusting unit 30. The clearance L of the roll 22 is changed to adjust the printing pressure of the skin care agent 2 when the absorbent article 1 is pressed against the coating roll 21. Further, in the manufacturing apparatus 100, the printing pressure adjusting unit 30 is used, and the clearance changing unit 23 is covered with the coating roll 21 and the crimping roll 22 according to the thickness distribution of the coated surface of the absorbent article 1 acquired by the detecting unit 10. One is tilted with respect to the other to adjust the printing pressure of the skin care agent 2 when the absorbent article 1 is pressure-bonded to the coating roll 21.

In the manufacturing apparatus 100, as shown in FIG. 2, the printing pressure adjusting unit 30 has a line controller 31 formed so as to control the drive of the conveyor belt 12 and a motor formed so as to control the drive of the clearance changing unit 23. It has an amplifier 32. The line controller 31 is electrically connected to a drive unit (not shown) that drives the transport belt 12. The motor amplifier 32 is electrically connected to the line controller 31 and the clearance changing unit 23. The motor amplifier 32 is a coating surface of the absorbent article 1 acquired by the detection unit 10 at the timing when the absorbent article 1 mounted on the transport belt 12 passes between the coating roll 21 and the crimping roll 22. The clearance changing portion 23 is controllably formed so as to have a clearance L in the thickness direction Z of the coating roll 21 and the crimping roll 22 corresponding to the average thickness d.

Next, regarding the manufacturing method of the coated object in which the liquid is applied to the object to be coated using the manufacturing apparatus of the present invention, refer to FIGS. 4 to 8 based on the manufacturing method using the manufacturing apparatus 100 described above. I will explain while. In the manufacturing method of the preferred embodiment of the present invention using the manufacturing apparatus 100, the absorbent article 3 after coating the absorbent article 1 is coated with the skin care agent 2 (the absorbent article coated with the skin care agent 2). This is the manufacturing method of 1).

In the graph shown in FIG. 4, a manufacturing apparatus 100 having a coating roll 21, a crimping roll 22, and a clearance changing portion 23 is used, the horizontal axis is the clearance L between the coating roll 21 and the crimping roll 22, and the vertical axis is the absorbency. As the coating amount T (wt%) of the skin care agent 2 to be coated with respect to the area weight of the article 1, the coating amount T (wt%) when the clearance L is changed by using the clearance changing portion 23 is measured. This is a plot of the results. The straight line C in FIG. 4 is based on a linear approximation (regression straight line by the least squares method).

From the results shown in FIG. 4, the clearance L of the coating roll 21 and the crimping roll 22 and the coating amount T (wt%) of the skin care agent 2 coated on the absorbent article 1 are related to each other by the relational expression y = -Ex + F ( It can be seen that there is an inverse proportional relationship indicated by y: coating amount, X: clearance L of the coating roll 21 and the crimping roll 22). That is, it can be seen that the coating pressure T of the coating roll 21 and the crimping roll 22 decreases as the clearance L increases, so that the coating amount T decreases linearly. Even if the clearance L is optimized, the present inventors change the coating amount T if the thickness of the absorbent article 1 (for example, the average thickness d of the coated surface) changes, and the coating amount T does not become the optimum coating amount. I thought. Therefore, the present inventors prepare a plurality of absorbent articles 1 to be coated having different average thicknesses d as samples, and use the manufacturing apparatus 100 to use the coating roll 21 and the crimping roll in each absorbent article 1. The amount T (wt%) of the skin care agent 2 applied to each absorbent article 1 when the clearance L of 22 was changed was measured. Then, the measurement results are plotted, and based on the plotted results, for example, the relationship between the clearance L and the coating amount T (wt%) in each absorbent article shown in FIG. 5 by the least squares method Aa, Ab, Ac. Was calculated. Then, enter the relationship Aa between the clearance L and coating amount T shown in FIG. 5 (wt%), Ab, the target coating quantity T _A to Ac, optimal with respect to the target coating quantity T _A of the absorbent article The clearances La, Lb and Lc were calculated. Then, the results are plotted, and based on the plotted results, for example, the relationship between the clearance L optimal for the target coating amount shown in FIG. 6 and the average thickness d of the coated surface of the absorbent article 1 by the least squares method. Was calculated. From the results shown in FIG. 6, the present inventors have found that the optimum clearance for the target coating amount and the thickness of the absorbent article 1 have a relationship represented by a straight line B. Then, the present inventors adjusted the clearance L based on the average thickness d of the absorbent article 1 by using the obtained relationship represented by the straight line B shown in FIG. 6 (see FIG. 7), and skin care. It has been found that the agent 2 can be uniformly and stably applied to the absorbent article 1. Hereinafter, description will be given with reference to the flowchart shown in FIG.

As shown in FIG. 2, first, the transport belt 12 is driven by using the line controller 31, and the skin care agent 2 transports the absorbent article 1 to be coated in the transport direction X. Then, the displacement meter controller 13 is used to cause the light emitting element (not shown) of the two-dimensional laser displacement meter 11 to emit light, and the absorbent article 1 before applying the skin care agent 2 mounted on the transport belt 12. A band-shaped blue laser beam (two-dimensional laser) is irradiated toward the irradiation side surface 1u. Then, the reflected light of the band-shaped blue laser light (two-dimensional laser) reflected by the light receiving element (not shown) of the two-dimensional laser displacement meter 11 on the irradiation side surface 1u of the absorbent article 1 (hereinafter referred to as the article reflected light). It also receives the reflected light (hereinafter, also referred to as the reference portion reflected light) of the band-shaped blue laser light (two-dimensional laser) reflected by the mounting surface 12u of the transport belt 12. The displacement meter controller 13 acquires a two-dimensional profile regarding the width direction Y and the thickness direction Z of the absorbent article 1 before applying the skin care agent 2 using the two-dimensional laser light received by the light receiving element (not shown). do. By using the two-dimensional laser displacement meter 11, for example, a two-dimensional profile can be acquired with one sensor, and a two-dimensional profile of an absorbent article can be acquired by a simple arithmetic process. The acquisition of the two-dimensional profile is continuously performed until the absorbent article 1 before the skin care agent 2 is applied passes under the two-dimensional laser displacement meter 11, and the displacement meter controller 13 determines the absorbent article 1. Acquire a continuous two-dimensional profile (FIG. 8: step S1).

Then, as shown in FIG. 8, the absorption being transported by the image inspection device 14 using the plurality of two-dimensional profiles of the absorbent article 1 continuously acquired by the displacement meter controller 13 along the transport direction X. A three-dimensional shape profile of the sex article 1 is generated (step S2). The generation of the three-dimensional shape profile using the continuous two-dimensional profile can be performed by using general image processing. After that, a reference plane (zero plane) is set for the generated three-dimensional shape profile (step S3). In the present embodiment, the mounting surface 12u of the transport belt 12 on which the absorbent article 1 is mounted is set as the reference plane. After setting the reference plane, the image inspection device 14 calculates the distance in the thickness direction from the mounting surface 12u of the transport belt 12, which is the reference plane, to the outer edge of the absorbent article 1, and has the distance data in three dimensions. A height profile is generated (height profile detection step) (step S4). After that, the analysis area of the coated surface to be coated with the liquid in the absorbent article 1 is designated (step S5), and the average thickness d of the analysis area is calculated by the image inspection device 14 (step S6).

Next, using a straight line B showing the relationship between the clearance L optimal for the target coating amount shown in FIG. 6 and the thickness of the absorbent article (for example, the average thickness d of the coated surface), the absorbency to be coated is planned. The thickness of the article 1 is determined to determine the clearance L between the coating roll 21 and the crimping roll 22. As shown in FIG. 7, the straight line B shown in FIG. 6, enter the current clearance L _A of the coating roll 21 and press roll 22 of the coating unit 20 (step S7), and the coating at the current state of the clearance L _A optimal thickness d _a of the absorbent article Engineering, it extracts the thick-Mino upper d1 and lower d2 (step S8). Upper d1 and lower d2 optimum thickness d _A for clearance L is, for example, be a thickness within about 10% with respect to the optimal thickness d _A of the clearance L, for example, with respect to the optimal thickness d _A Te, the upper limit was made 1.1d _a, the lower limit may be 0.9D _a. The setting of the optimum _{allowable range of thickness d A} (upper limit d1 and lower limit d2) is not limited to the above.

Next, as shown in FIG. 7, after setting the upper limit d1 and the lower limit d2 of the thickness of the absorbent article (object to be coated), the thickness of the absorbent article 1 to be actually coated is determined ( Step S9). The average thickness d of the coated surface of the absorbent article 1 of the coating scheduled, if within the allowable range of the thickness is set (d2 <d <d1), the optimum coating amount as is clearance L _A is since obtained is maintained as unchanged the current state of the clearance L _a (step S10). On the other hand, when the average thickness d of the coated surface of the absorbent article 1 to be coated is outside the permissible range of thickness (d <d2 or d1 <d), for example, when the average thickness d is thicker than the upper limit d1 of the thickness ( d1 <d), the thickness d is input to the straight line B, and the clearance L _d corresponding to the thickness d is calculated. As a calculated clearance L _d, it changes the current state of the clearance L _A (step S11). In this way, the clearance L is changed to adjust the printing pressure of the coating roll 21 and the crimping roll 22 when applying the liquid to the absorbent article 1 (printing pressure adjusting step).

To change the status of clearance L _A, a pair of lift support portions 25R, 25L by a predetermined amount of rotation of the respective motors 25 mT. When the motors 25mt of each of the pair of elevating support portions 25R and 25L rotate by a predetermined amount, the screw shaft 25s rotates by a predetermined amount due to the rotational force of the motors 25mt transmitted via the rotation transmission portion 25g. When the screw shaft 25s rotates by a predetermined amount, the nut portion 25n screwed into the screw shaft 25s moves up and down by a predetermined amount along the screw groove, and the pair of roll support portions 24R and 24L to which the nut portion 25n is fixed are also nut portions 25n. It goes up and down by a predetermined amount. That is, the coating roll 21 supported by the pair of roll support portions 24R and 24L moves up and down by a predetermined amount substantially in parallel with the crimping roll 22. Then, the printing pressure adjustment step, as shown in FIGS. 2 and 3, a pair of lift support portions 25R, 25L have respective motors 25 mT, it is rotated until the clearance L _d where current clearance L _A is calculated, marked The motor amplifier 32 of the pressure adjusting unit 30 is used to stop the motors 25mt of each of the pair of elevating support units 25R and 25L. The current state of the clearance L _A is from it the best clearance L _d to the average thickness d of the coated surface of the absorbent article 1 of the coating will, to secure the clearance (Step S10). By controlling the clearance L of the coating roll 21 and the crimping roll 22 in the thickness direction Z with respect to the average thickness d of the coated surface of the absorbent article 1 passing between the coating roll 21 and the crimping roll 22 in this way. it is possible to uniformly perform the coating of the target coating quantity T _a with respect to the coated surface of the absorbent article 1.

Further, in the printing pressure adjusting step, the clearance changing portion 23 is subjected to the coating surface in accordance with the timing of transporting the absorbent article 1 in which the average thickness d of the coating surface is detected between the coating roll 21 and the crimping roll 22. It is preferable to change the clearance L based on the average thickness d of. For example, as shown in FIG. 2, the absorbent article 1 mounted on the transport belt 12 whose drive is controlled by the line controller 31 and whose average thickness d of the coated surface is detected by the detection unit 10 is coated. The clearance L of the coating roll 21 and the crimping roll 22 in the thickness direction Z is changed by using the motor amplifier 32 in accordance with the timing of passing between the working roll 21 and the crimping roll 22. By changing the clearance L between the coating roll 21 and the crimping roll 22 according to the timing at which the absorbent article 1 passes between the coating roll 21 and the crimping roll 22, the absorbent article 1 can be coated. It can be done efficiently.

Further, in the printing pressure adjusting step, a clearance is used by using the printing pressure adjusting unit 30 in accordance with the thickness distribution (three-dimensional thickness distribution) of the coated surface of the absorbent article 1 detected by the image inspection device 14 of the detecting unit 10. It is preferable to incline the coating roll 21 with respect to the crimping roll 22 on the changing portion 23 to adjust the printing pressure of the skin care agent 2 on the absorbent article 1. For example, if the driving time, the number of rotations, etc. of the motor 25 mt of the elevating support portion 25R and the motor 25 mt of the elevating support portion 25L are changed, the elevating distances of the pair of roll support portions 24R and 24L are changed, and the coating roll 21 is a crimping roll. It will be tilted with respect to 22. In this way, it is preferable that the coating roll 21 is appropriately tilted with respect to the crimping roll 22 so as to correspond to the thickness distribution (three-dimensional thickness distribution) of the entire absorbent article 1. In this way, by detecting the thickness distribution of the coated surface of the absorbent article 1 including the absorber having a laminated structure in which the thickness of each individual is likely to vary, the thickness distribution can be dealt with in the printing pressure adjusting step. By changing the clearance L between the coating roll 21 and the crimping roll 22, the skin care agent 2 can be further uniformly coated on the absorbent article 1.

As described above, the manufacturing apparatus 100 is formed so that the average thickness d of the coated surface of the absorbent article 1 before the skin care agent 2 is coated can be detected by using the two-dimensional laser displacement meter 11. The printing pressure adjusting unit 30 is formed so that the clearance changing portion 23 changes the clearance L of the coating roll 21 and the crimping roll 22 so that the printing pressure when the absorbent article 1 is crimped to the coating roll 21 can be adjusted. And have. Therefore, for example, by acquiring a two-dimensional profile using the two-dimensional laser displacement meter 11, the number of sensors can be reduced and the manufacturing apparatus can be simplified. Further, by using the printing pressure adjusting unit 30 to adjust the printing pressure according to the average thickness d of the coated surface of the absorbent article 1 at the clearance changing unit 23, the skin care agent 2 is added to the absorbent articles 1 having different thicknesses. It can be painted like this.

Further, in the method of manufacturing the absorbent article 3 after coating using the manufacturing apparatus 100, the two-dimensional profile of the absorbent article 1 is continuously measured by using the two-dimensional laser displacement meter 11 to acquire the three-dimensional shape profile. Then, the clearance L of the coating roll 21 and the crimping roll 22 is changed based on the height profile detection step of acquiring the three-dimensional height profile based on the three-dimensional shape profile and the acquired three-dimensional height profile. It also includes a printing pressure adjusting step for adjusting the printing pressure when applying the liquid to the absorbent article 1. Therefore, it is possible to apply the skin care agent 2 according to the thickness of the absorbent article 1, and it is possible to efficiently manufacture the absorbent article 3 after coating in which the skin care agent is uniformly applied. can.

Further, in the method of manufacturing the absorbent article 3 after coating using the manufacturing apparatus 100, by using the two-dimensional laser displacement meter 11, the concave-convex shape of the absorbent article 1 conveyed below the two-dimensional laser displacement meter. A three-dimensional shape profile composed of the above can be easily obtained. Further, by using the image inspection device 14, the average thickness of the coated surface of the absorbent article 1 can be easily calculated from the profile of the three-dimensional shape. Therefore, the printing pressure of the absorbent article 1 can be adjusted with high accuracy, and the skin care agent 2 can be uniformly applied to the absorbent article 1.

Further, in the method of manufacturing the absorbent article 3 after coating using the manufacturing apparatus 100, the thickness distribution (three-dimensional thickness distribution) of the coated surface of the absorbent article 1 is detected by using the image inspection device 14. For example, it becomes possible to divide the absorbent article 1 into each region and detect the average thickness of the region (for example, the average thickness in the width direction Y or the average thickness in the transport direction X and the width direction Y). It is also possible to selectively extract and coat the portion of the absorbent article 1 to be coated.

In the manufacturing apparatus 100 of the present embodiment, the detection unit 10 has the two-dimensional laser displacement meter 11, but the manufacturing apparatus 100 includes the detection unit having the three-dimensional laser displacement meter instead of the two-dimensional laser displacement meter 11. A device may be used. When the two-dimensional laser displacement meter 11 is used, the object to be coated is irradiated with the two-dimensional laser by the two-dimensional laser displacement meter 11, and the two-dimensional profile regarding the width direction Y and the thickness direction Z is transmitted along the transport direction X. A three-dimensional shape profile was acquired by making multiple measurements, but if a three-dimensional laser displacement meter is used, the three-dimensional shape profile can be acquired by one measurement operation of the object to be coated by the three-dimensional laser displacement meter. can do. Then, the three-dimensional height profile can be acquired based on the acquired three-dimensional shape profile. By using the three-dimensional laser displacement meter in this way, the three-dimensional height profile can be easily acquired. Further, by using the three-dimensional laser displacement meter, for example, the three-dimensional profile can be acquired even when the object to be coated is stationary. If a manufacturing apparatus having such a three-dimensional laser displacement meter is used, the coating roll 21 and the clearance changing unit 23 can be used based on the three-dimensional height profile acquired by the detection unit 10 using the three-dimensional laser displacement meter. By changing the clearance L with the crimping roll 22 and adjusting the printing pressure, the liquid can be uniformly applied to the objects to be coated having different thicknesses.

Although the present invention has been described above based on the preferred embodiment thereof, the present invention is not limited to the present embodiment. For example, in the manufacturing apparatus 100, a two-dimensional laser displacement meter having a light emitting element (not shown) for irradiating blue laser light is used, but the light emitting element of the two-dimensional laser displacement meter is not limited to this, for example, 380. ~ 500 nm A light emitting element that irradiates a laser beam having a wavelength other than the above, that is, a laser beam other than the blue laser beam may be used.

Further, in the manufacturing apparatus 100, the reference portion is a transport belt 12, but instead of the transport belt 12, for example, a reference portion having a smooth irradiation side surface is placed below the transport belt 12. It may be separately arranged in a fixed state so as to face the dimensional laser displacement meter 11.

Further, in the manufacturing apparatus 100, the three-dimensional shape profile and the three-dimensional height profile were acquired by using the image inspection apparatus 14, but the three-dimensional shape profile and the three-dimensional height profile were acquired by using the displacement meter controller 13. May be good.

Further, for example, in the manufacturing apparatus 100, the pair of roll support portions 24R and 24L are moved up and down by using a ball screw on the pair of elevating support portions 25R and 25L, but the method is not limited to the ball screw and other elevating means is used. You may.

Further, in the manufacturing apparatus 100, the crimping roll 22 is fixed to the frame (not shown) of the coating unit 20 and the coating roll 21 is moved up and down to the clearance changing portion 23, but the coating roll 21 is moved to the coating unit 20. The crimping roll 22 may be moved up and down to the clearance changing portion 23 by fixing to the frame (not shown).

1 Absorbent article (object to be coated)
2 Skin care agent (liquid)
10 Detection unit 11 Two-dimensional laser displacement meter 12 Conveyance belt (reference unit)
13 Displacement meter controller 14 Image inspection device 20 Coating unit 21 Coating roll 22 Crimping roll 23 Clearance change part 24R, 24L Pair of roll support parts 25R, 25L Pair of elevating support part 30 Printing pressure adjustment part 31 Line controller 32 Motor amplifier 100 Manufacturing equipment d Surface-to-surface distance L Clearance between coating roll and crimping roll

Claims (4)

The coating roll and the coating roll are provided with a coating roll in which the liquid to be coated is applied to the peripheral surface, and a crimping roll which is arranged to face the coating roll and presses the object to be coated on the coating roll. It is a manufacturing method of a coated object in which a liquid is applied to the object to be coated by passing the object to be coated between the crimping rolls.
A step of the two-dimensional profile of the object to be coated was to produce continuously measured by the three-dimensional shape profile using 2D laser displacement meter reflective being sent transportable,
A step of setting a reference plane which is a zero plane of height with respect to the three-dimensional formation profile, and
The height profile detecting step of obtaining a three-dimensional height profile from the reference plane to the irradiation surface of the object to be coated object based on the three-dimensional shape profile,
A step of designating an analysis area of the coated surface to which the liquid is applied to the three-dimensional height profile acquired in the height profile detection step, and a step of designating the analysis area.
A step of calculating the average thickness of the object to be coated in the analysis region, and
Based on the relational expression between the clearance of the coating roll and the crimping roll obtained in advance and the average thickness of the object to be coated, the thickness of the object to be coated in the analysis region in the current clearance The process of setting the tolerance and
A step of determining the thickness based on the average thickness of the object to be coated in the analysis region and the allowable range of the thickness.
When the average thickness of the object to be coated in the analysis area is within the allowable range of the thickness, the current clearance is maintained, and the average thickness of the object to be coated in the analysis area is outside the allowable range of the thickness. cases, change the status of clearance, the printing pressure adjustment step and method for producing a coating material comprising adjusting the printing pressure during application of the liquid to be coated thereof. The method for manufacturing a coated object according to claim 1, wherein the reference surface is a mounting surface of a transport belt on which the object to be coated is placed and conveyed. The relational expression between the clearance and the average thickness of the object to be coated, which is optimal for the target coating amount, is obtained in advance.
The coating according to claim 1 or 2, wherein in the step of setting the permissible range, the permissible range of the thickness of the object to be coated in the analysis region in the current clearance is set based on the relational expression. Manufacturing method of things. In the printing pressure adjusting step, when the average thickness of the object to be coated in the analysis region is outside the allowable range of the thickness, the average thickness of the object to be coated in the analysis region is set based on the relational expression. The method for manufacturing a coated product according to any one of claims 1 to 3, wherein the corresponding clearance is calculated and the current clearance is changed so as to be the calculated clearance.

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