JP5324154B2 - Liquid coating apparatus and method for manufacturing absorbent article - Google Patents

Description

  The present invention relates to a liquid coating apparatus.

Conventionally, as an adhesive coating apparatus for applying an adhesive to a moving object to be coated in a predetermined pattern, a cylindrical pattern cylinder having a plurality of discharge holes corresponding to the predetermined pattern, and an inside of the pattern cylinder An adhesive having a driving drum disposed therein, and once the hot melt adhesive supplied from the supply means is accumulated in a recess formed on the back side of the pattern cylinder, and then discharged from the discharge hole of the pattern cylinder A coating apparatus is known (see Patent Document 1).
Further, in Patent Document 1, since the hot melt adhesive is once accumulated in the recesses and then discharged from the pores through the discharge holes, a uniform pressure is applied to the hot melt adhesive and a more stable pattern coating is applied. There is a description that it is possible to work.

Japanese Patent Laid-Open No. 9-299849

  However, in the coating apparatus described in Patent Document 1, since the size of the portion having the discharge hole of the pattern cylinder that determines the coating pattern of the adhesive is smaller than the size of the concave portion located below the pattern cylinder, In the hot melt adhesive flowing in the recesses, the stagnation and uneven flow may occur, and the discharge amount may be uneven or uneven.

  Accordingly, an object of the present invention is to apply the liquid evenly over the entire area to be coated when a liquid such as an adhesive is applied to an object to be coated with a predetermined coating pattern. It is in providing the liquid coating apparatus which can be performed.

  The present invention is a liquid coating apparatus that includes a discharge roller that discharges a liquid supplied from a supply unit in a predetermined pattern, and that applies the liquid discharged from the discharge roller to a moving workpiece, The discharge roller includes a surface plate that forms an outer peripheral portion, and a roller main body that forms a portion inside the surface plate of the discharge roller, and the outer peripheral portion of the roller main body includes an inner portion of the roller main body. A recess having a predetermined shape is formed to diffuse the liquid introduced through the surface plate in a direction along the surface of the surface plate, and the entire surface of the surface plate covering the recess is made of a porous body. The object is achieved by providing a liquid coating apparatus in which the liquid is discharged from the entire area of the plate covering the concave portion.

Further, the present invention is a method for producing an absorbent article that has an adhesive part formed by applying an adhesive on a garment contact surface, and is used by being fixed to clothing through the adhesive part, The manufacturing method of the absorbent article which comprises the process of applying an adhesive agent to the sheet material which comprises the said clothing contact surface with the said liquid application apparatus which applies an adhesive agent as the said liquid is provided.
Further, the present invention provides a process of applying an adhesive to a constituent material of an absorbent article by the liquid application apparatus that applies an adhesive as the liquid, and the constituent material is passed through the adhesive to the other material. The manufacturing method of the absorbent article which comprises the process joined to a constituent material is provided.

According to the liquid coating apparatus of the present invention, when a liquid such as an adhesive is applied to an object to be coated with a predetermined coating pattern, the liquid is uniformly applied over the entire region to be coated. be able to.
According to the method for producing an absorbent article of the present invention, the adhesive can be applied evenly to the region to be coated, and a high-quality absorbent article can be produced efficiently.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
FIG. 1 is a perspective view showing a main part of a liquid coating apparatus (hereinafter also referred to as the present coating apparatus 1) according to an embodiment of the present invention.
The present coating apparatus 1 is a hot melt adhesive coating apparatus. As shown in FIG. 1, a supply means 2 for supplying a hot melt adhesive and a hot melt adhesive supplied from the supply means 2 are predetermined. A discharge roller 3 that discharges in a pattern; and a transfer unit 4 that transfers the hot melt adhesive 5 having a predetermined pattern discharged from the discharge roller 3 to the surface of a strip-like sheet (object to be coated) S that is continuously supplied. It comprises. The code | symbol 50 in FIG. 1 has shown the part (adhesive coating part) in which the hot-melt-adhesive 5 was coated in the strip | belt-shaped sheet | seat S. FIG.

  The supply means 2 includes a tank (not shown) containing hot melt adhesive, a supply pipe 21 connecting the tank and the discharge roller 3, and a pump (not shown) interposed in the supply pipe 21. A return pipe 22 branched from the supply pipe 21 and connected to the tank, and a control valve 23 for switching the flow of the hot melt adhesive from the supply pipe 21 to either the return pipe 22 side or the discharge roller 3 side. And.

As shown in FIGS. 1 and 2, the discharge roller 3 includes a surface plate 31 that forms an outer peripheral portion of the discharge roller 3, and a roller main body 32 that forms an inner side (rotation axis side) portion of the discharge roller 3 than the surface plate 31. And comprising.
The roller body 32 has a columnar shape, and a plurality of concave portions 33 are formed on the outer peripheral portion thereof at intervals in the circumferential direction. Each recessed portion 33 is formed with a step between the portions other than the recessed portion 33, and an introduction port 34 for introducing a hot melt adhesive into the recessed portion 33 is provided on the bottom surface portion thereof. And the surface plate 31 is being fixed to the outer peripheral surface of the roller main body 32 so that the recessed part 33 may be covered.
The surface plate 31 is made of a porous body. The porous body has a large number of pores penetrating between the front and back surfaces, and a liquid to be applied (in the present embodiment, a hot melt adhesive) can permeate through the pores. As the porous body, it is possible to use a wire mesh, a punching metal, an etching aperture material, a sintered metal, a ceramic, a laminate of these, and the like.

As shown in FIGS. 2 and 3, the roller main body 32 in the coating apparatus 1 has a main body portion 35 constituting a portion close to the rotation axis thereof, and an opening portion 36 a having a predetermined shape, and the inner side of the opening portion 36 a. The portion includes a pattern-shaped plate 36 that forms the concave portion 33.
The main body portion 35 has a cylindrical shape and has the introduction port 34 on the outer peripheral surface thereof.
The pattern shape plate 36 is fixed so that the introduction port 34 is located inside the opening 36a. The inner peripheral surface 36 a ′ of the opening 36 a is perpendicular to the bottom surface 35 a of the recess 33. The bottom surface 35 a of the recess 33 is formed from the outer peripheral surface of the main body portion 35. Even when the inner peripheral surface 36a ′ of the opening 36a is inclined with respect to the bottom surface 35a, the opening shape of the recess 33 is the shape of the opening edge of the opening 36a on the surface plate 31 side.

  A plurality of pattern shape plates 36 are fixed in series in the circumferential direction on the outer peripheral surface of the main body portion 35, and a cylindrical outer peripheral portion of the roller main body 32 is formed by the plurality of pattern shape plates 36. ing. The surface plate 31 is fixed to the outer side of the outer peripheral portion made of the pattern-shaped plate 36 of the roller body 32. The surface plate 31 is fixed so as to cover the entire recess 33 formed by the opening 36 a of the pattern shape plate 36. One surface plate 31 in the coating apparatus 1 is provided for each pattern shape plate 36, and each surface plate 31 can be attached to and detached from the pattern shape plate 36 by a fixture such as a bolt. It is fixed to. The pattern shape plates 36 are also fixed to the main body portion 35 so as to be detachable by a fixing tool such as a bolt. The fixture that fixes the pattern shape plate 36 to the main body portion 35 may also serve as the fixture that fixes the surface plate 31 to the pattern shape plate 36. The pattern shape plate 36 may be fixed to the main body portion 35 after being fixed to the surface plate 31. The surface plate 31 may have a length that extends over the entire length of the roller body 32 in the circumferential direction. The one surface plate 31 is fixed to the body portion 35 to which the pattern shape plate 36 is fixed. It may be fixed detachably.

  As shown in FIG. 3, a main pipe line 35 b that extends in the rotation axis direction of the discharge roller 3 and into which the hot melt adhesive supplied from the supply pipe 21 flows is provided in the shaft core portion of the roller body 32. . A plurality of branch pipes 35 c that connect the main pipe 35 b and the introduction port 34 are formed inside the roller body 32. Then, the hot melt adhesive supplied through the supply pipe 21 of the supply means 2 is introduced into the recess 33 from the introduction port 34 through the main pipeline 35b and the branch pipeline 35c, and the hot melt adhesive introduced into the recess 33 is introduced. Is diffused in the recess 33 in a direction along the surface of the surface plate 31 (a direction substantially parallel to the surface of the surface plate 31), and then discharged from the surface of the discharge roller 3 through the hole of the surface plate 31. It has been. The direction along the surface of the surface plate 31 is also a direction orthogonal to the depth direction of the recess 33. Further, the diffusion in the direction along the surface of the surface plate 31 means that the diffusion is very small in the direction, and the direction perpendicular to the surface of the surface plate 31 simultaneously with the diffusion in the direction (depth direction of the recess). It does not prevent it from diffusing.

  The surface plate 31 used in the coating apparatus 1 is entirely made of a porous body in the planar direction (referred to as a direction orthogonal to the thickness direction). Accordingly, the entire area of the surface plate 31 covering the recess 33 is made of a porous body, and the hot melt adhesive is discharged from the entire area of the surface plate covering the recess 33, and the shape of the discharged hot melt adhesive is Is substantially the same as the opening shape of the recess 33.

When the porous body constituting the surface plate 31 is a punching metal or an etching aperture material, the area of the hole (opening area ratio) in the portion covering the recess 33 is 1 to 76%, particularly 10 to 60%. Preferably, the number of pores per 1 cm ^{2 of} the porous body is more preferably about 1 to 10,000, particularly about 125 to 2,500. It is preferable that the hole diameter of each hole is 0.05-2 mm.
When the porous body constituting the surface plate 31 is a metal net, sintered metal, or ceramic, the area of the hole (opening area ratio) in the portion covering the recess 33 is 1 to 80%, particularly 10 to 60%. preferably, the area of the individual pores is preferably 0.002～3.2Mm ^2, more preferred is 0.004~0.5mm ^2.

The average pore diameter and the pore area of the porous body constituting the surface plate 31 are measured as follows.
The average pore diameter was observed from directly above the surface plate 31 with an optical microscope, and the area of the openings on the surface was measured at least 10 points. S (hole area) = PAI / 4 × d ² (PAI = 3.14) ) Is calculated as the equivalent circle diameter and the average of these values. The area of the hole can be easily measured by, for example, using a Keyence digital HD microscope VH-7000 and surrounding an arbitrary point on the observed screen.
In the case of a surface plate in which a plurality of porous bodies are laminated, the average pore diameter measured for each porous body is preferably in the above range.

The depth of the recess 33 in the present embodiment (the same as the distance between the bottom surface 35a of the recess 33 and the surface plate 31) is uniform throughout the entire area. The depth of the recess 33 is preferably 0.1 to 5.0 mm, and more preferably 0.5 to 3.0 mm.
Moreover, it is preferable to provide the inlet 34 provided in the recessed part 33 in the ratio used as one per 0.5-10 cm < ² > of bottom areas of the recessed part 33. FIG.

  The thickness of the surface plate 31 is preferably 2 mm or less as a whole, more preferably 1 mm or less, and even more preferably 0.3 to 0.9 mm, from the viewpoint of uniformly coating the entire region to be coated. Further, from the same viewpoint, the thickness of the surface plate 31 is preferably 0.05 to 20 times, and more preferably 0.1 to 2 times the depth of the recess 33.

  At one end of the main body portion 35 of the roller body 32, there is provided a pipe portion 35d that is rotatably connected to the end of the supply pipe 21 of the supply means 2, and is not shown at the other end. A shaft portion 35e connected to the drive shaft of the drive source is provided. Further, heating means (not shown) such as a cartridge heater is incorporated in the main body portion 35 of the roller main body 32, and the hot flow that flows in the roller main body 32 by adjusting the temperature by the cartridge heater or the like. The viscosity of the melt adhesive can be controlled.

  The transfer unit 4 includes a transfer roller 41 that rotates to face the outer peripheral surface of the surface plate 31 of the discharge roller 3 and the surface to be coated of the belt-like sheet S, and a belt-like sheet that is disposed below the transfer roller 41 and is placed together with the transfer roller 41. And a nip roller 42 for feeding out S.

  The outer peripheral surface 41a of the transfer roller 41 is lined with an easily peelable material such as silicone rubber so that the discharged hot melt adhesive can be easily peeled off and applied to the surface of the object to be coated. There is. Further, a pipe line (not shown) is provided inside the transfer roller 41, and the temperature of the transfer roller 41 can be controlled to a low temperature by circulating cooling water through the water supply pipe line 41b. It is. One end of the transfer roller 41 is provided with a pipe 41c that is rotatably connected to the water supply pipe 41b, and a shaft 41d that is connected to drive of a drive source (not shown) is provided at the other end. Is provided.

  The coating apparatus 1 is equipped with a controller (not shown) for controlling the rotation speed of the discharge roller 3 and the transfer roller 41, the on / off of the control valve 23 and the cartridge heater, the circulation amount of the cooling water, and the like. The operation control of the coating apparatus 1 corresponding to the hot melt adhesive, the coating pattern and the like can be performed.

Next, operation | movement of this coating apparatus 1 is demonstrated.
First, a hot melt adhesive is put into a tank (not shown) to bring it into a molten state. Then, the discharge roller 32 and the transfer roller 41 are rotated so that their peripheral speeds are equal. Further, the nip roller 42 is also rotated so that the circumferential speed thereof is equal to that of the transfer roller 41, and the conveyance speed of the belt-like sheet S is made the same as the circumferential speed of the transfer roller 41.
Then, the hot melt adhesive in a molten state is supplied into the roller body 32 of the discharge roller 3 through the supply pipe 21 of the supply means 2 by a pump (not shown).

The hot melt adhesive supplied from the supply means 2 passes through the main pipe 35b and the branch pipe 35c formed in the main body portion 35 of the roller main body 32 and enters the recess 33 from the inlet 34 formed on the outer peripheral surface thereof. After being supplied and diffused in the direction along the surface of the surface plate 31 in the recess 33, it is guided to the surface of the discharge roller 3 through the holes of the porous body constituting the surface plate 31, and the outer surface of the transfer roller 41. In a predetermined pattern.
Then, the transfer roller 41 rotates to transfer the hot melt adhesive onto the surface of the belt-like sheet S that moves between the transfer roller 41 and the nip roller 42.
In this manner, the hot melt adhesive 5 is applied to the surface of the belt-like sheet S (the surface to be coated 9), whereby the surface of the belt-like sheet S has substantially the same shape as the opening shape of the recess 33. An adhesive application part 50 (liquid application part) is formed.

  The shape of the opening of the recess 33 and the shape of the adhesive coating part (liquid coating part) formed on the article to be coated are substantially the same as the opening 36a with respect to the bottom surface 35a of the coating roller 3. The spread of the shape due to the distance from the inner peripheral surface to the opening surface of the recess 33 (the back surface of the surface plate), and the distance from the opening surface of the recess 33 (the back surface of the surface plate) to the surface of the surface plate (porous body) Of the hot melt adhesive at the time of permeation of the porous body due to the presence of the thickness), and between the coating roller 3 and the transfer roller 41 or between the transfer roller 41 and the moving speed of the belt-like sheet S A slight difference occurs between the total length L1 of the concave portion 33 in the circumferential direction of the coating roller 3 and the total length L2 of the adhesive coating portion in the moving direction of the belt-like sheet S due to a slight difference between them. Forgive It is intended to. However, the difference between the total length L1 of the recess 33 and the total length L2 of the adhesive coating portion is substantially the same when it is within 20% of the total length L1, and the difference is within 20% of the total length L1, In particular, it is preferably within 10%. In addition, the difference of the direction orthogonal to the axial length direction of the coating roller 3 and the moving direction of the strip | belt-shaped sheet | seat S has a ratio equal to or lower than the difference of full length L1, L2.

According to the coating apparatus 1 of the present embodiment, the entire area of the surface plate 31 covering the recess 33 is made of a porous body, and the hot melt adhesive is discharged from the entire area of the surface plate 31 covering the recess 33. Therefore, as compared with the case of using a surface plate in which holes are distributed in a shape different from the opening shape of the concave portion 33, the adhesive that diffuses in the concave portion 33 is less likely to retain and flow unevenness.
Therefore, the hot melt adhesive discharged from the surface plate 31 has a uniform discharge amount over the entire discharge range, and a uniform amount of hot melt over the entire area of the outer surface of the transfer roller 41 that overlaps the recess 33. Adhesive adheres. And since the hot-melt-adhesive agent which adhered so uniformly is transcribe | transferred to the strip | belt-shaped sheet | seat S, the adhesive agent coating part 50 to which the hot-melt adhesive agent in the strip | belt-shaped sheet | seat S was coated is uniform in the whole region An amount of hot melt adhesive is applied.
In this way, according to the present coating apparatus 1, when the adhesive is applied to the article to be coated with a predetermined coating pattern, the adhesive is uniformly applied over the entire region to be coated. be able to.

  In the adhesive coating apparatus described in Patent Document 1, the adhesive coating pattern can be changed by changing the pattern of holes formed in the pattern cylinder constituting the outer surface of the discharge roller. However, when the adhesive coating pattern is changed only by changing the hole formation pattern, the hole formation pattern and the opening shape of the recesses formed on the back surface of the pattern cylinder are at least before or after the change. In this case, the adhesive stays in the recess and the flow is uneven, and the coating amount is uneven within the hot melt coating range.

In the coating apparatus 1 of the present embodiment, as described above, the concave portion 33 on the outer peripheral portion of the roller body 32 is formed by the pattern shape plate 36 having the opening portion 36a having a predetermined shape. A recess 33 substantially the same as the shape of the adhesive coating portion 50 formed on the workpiece can be easily formed.
In addition, since the pattern shape plate 36 is detachably fixed to the main body portion 35, the pattern shape plate 36 is substantially the same as the changed coating pattern when the adhesive coating pattern is changed. It can be replaced with a pattern shape plate 36 having a shape opening 36a. Therefore, even when the adhesive application pattern is changed, the adhesive can be applied uniformly over the entire region to be applied by replacing the pattern shape plate 36.
Furthermore, in the coating apparatus 1 of this embodiment, since the pattern shape plate 36 and the surface plate 31 can be separated, when changing the coating pattern of the adhesive, only the pattern shape plate 36 is replaced, and the surface The same plate 31 can be used without replacement.

The adhesive used in the present invention is preferably a hot melt adhesive, but an adhesive other than the hot melt adhesive, for example, low density polyethylene, polyvinyl acetate, silicone resin, glue or the like can also be used.
The hot melt adhesive is not particularly limited. For example, styrene rubber such as styrene / butadiene / styrene block copolymer (SBS), styrene / ethylene / butylene / styrene block copolymer (SEBS), or amorphous poly Examples thereof include hot melt adhesives such as olefin polymers such as α-olefin (APAO) and ethylene vinyl acetate copolymer (EVA).
In addition, the object to be coated in the present invention is not particularly limited, but for example, a sheet-like material composed of a nonwoven fabric, a woven fabric, a resin film, a knitted fabric, or a laminate in which these sheet-like materials are laminated in two or more layers. And articles obtained by further laminating or sandwiching other members on the sheet, these sheet-like materials and laminates. The object to be coated may be a continuous belt-like body or may have a predetermined length and be sequentially conveyed at a predetermined interval.

The above-mentioned coating apparatus 1 has an adhesive part which consists of a hot-melt-adhesive, and can be preferably used for manufacture of the absorbent article used by being fixed to clothing via this adhesive part. Examples of such absorbent articles include absorbent articles that absorb liquid discharged from the body, such as sanitary napkins, panty liners (downlink sheets), and incontinence pads. These generally comprise a liquid-retaining top sheet, a liquid-impermeable (concept including impermeability) back sheet, and an absorber disposed between the two sheets, and are hot-melt bonded to the clothing contact surface. Has a pressure-sensitive adhesive portion made of an agent, or has a wing portion on both the left and right sides of a vertically long main body portion, and has a pressure-sensitive adhesive portion made of a hot melt adhesive on one side (clothing contact surface) of the wing portion. . You may have an adhesion part in both a main-body part and a wing part.
When manufacturing such an absorbent article, the above-described coating is applied to the strip-shaped raw sheet of the sheet constituting the clothing contact surface, or the strip-shaped or non-band-shaped original sheet of the sheet laminated with other materials. The hot melt adhesive is applied using the processing apparatus 1 to form a pressure-sensitive adhesive portion having a predetermined shape. Other than that is the same as the manufacturing method of the conventional absorbent article.

As mentioned above, although one Embodiment of this invention was described, this invention is not restrict | limited to the said embodiment, It can change suitably.
For example, as shown in FIG. 5A, when the adhesive 5 is applied in a pattern in which an adhesive non-applied portion 51 is formed at the center, the adhesive 5 is shown in FIGS. 5B and 5C. As described above, the annular recess 33 can be formed by arranging an auxiliary plate 37 having substantially the same thickness as the pattern shape plate 36 inside the opening 36 a of the pattern shape plate 36. In the embodiment shown in FIG. 5B and FIG. 5C, the inner portion of the opening 36a of the pattern shape plate and the outer portion of the auxiliary plate 37 form the recess 33.
Even in this case, by using the surface plate 31 in which the entire area of the portion covering the concave portion 33 is made of a porous body, by discharging the hot melt adhesive from the entire area of the portion covering the concave portion 33 of the surface plate 31, the adhesive is The coating can be performed uniformly over the entire area to be coated. Further, instead of providing the auxiliary plate 37, a convex portion is formed on the outer peripheral surface of the main body portion 35, and the convex portion is positioned inside the opening 36a, whereby an annular concave portion is formed around the convex portion. 33 can also be formed.

  In the embodiment shown in FIG. 6, the auxiliary plate 37 disposed inside the opening 36 a of the pattern shape plate 36 has grooves 37 a and 37 b on the surface (back surface) in contact with the outer peripheral surface of the main body portion 35. Is used. Each of the grooves 37a and 37b extends in the circumferential direction or the axial length direction of the roller body 32, and in a state where the grooves 37a and 37b are arranged on the outer circumferential surface of the body portion 35, the hot melt adhesive supplied from the branch pipe 35c is recessed. A flow path leading to 33 is formed. By using the auxiliary plate 37 having such grooves 37a and 37b, or an auxiliary plate (not shown) in which a duct functioning in the same manner as the flow path is formed inside, an adhesive is guided to the recess 33. The flow path can be easily designed.

The embodiment shown in FIG. 7 is an example in which the adhesive is applied in a different pattern.
In the embodiment shown in FIG. 7, the adhesive 5 is applied in a coating pattern in which an adhesive non-application part 51 is interposed between the adhesive application parts 50. In the embodiment shown in FIG. 7, an opening 36 a corresponding to each adhesive application portion 50 is formed in the pattern shape plate 36, and a concave portion 33 having a shape substantially matching the shape of each adhesive application portion 50 is formed. Forming.
Even in this case, by using the surface plate 31 in which all the portions covering these recesses 33 are made of a porous body, the hot melt adhesive is discharged from the entire region covering the recesses 33 of the surface plate 31. The adhesive application part 50 in which the hot melt adhesive is uniformly present over the entire area can be formed on the object to be coated.

As shown in FIG. 8, the permeation and diffusibility of liquid (adhesive etc.) inside the concave portion 33 formed on the outer peripheral portion of the roller body 32 is from the portion covering the concave portion 33 of the surface plate 31, that is, from the porous body. It is also preferable to dispose a material 6 that is equal to or better than the portion to be formed.
The comparison of permeation diffusivity can be performed by injecting a liquid (adhesive or the like) having the same viscosity into each of the material 6 and the porous body, and comparing the spread area of the liquid after a certain time. The larger the spread area, the better the transmission diffusibility.
For example, as shown in FIG. 8C, a disk-shaped sample 71 having a circular shape in plan view and a thickness of 5 mm is made from the same material 6 and the material used for the porous body, and a cylindrical small sample is formed at the bottom. The sample 71 is disposed in the recess 73 of the auxiliary tool 70 having a hole 72 and having a recess 73 having a size that allows the sample 71 to be accommodated therein. Then, a liquid (adhesive or the like) is poured from the small hole 72, and after a predetermined time, an area (expanded area) of the liquid (adhesive or the like) 75 spreading on the surface 74 opposite to the side having the small hole is obtained. taking measurement. In this measurement, the auxiliary tool 70 has the small hole 72 side facing up and the surface 74 facing down.
About each of the porous body which comprises the material 6 and the surface plate 31, it tests similarly using the liquid of the same viscosity, and it is judged that the permeation | transmission diffusivity is better than the one where a wide expansion area is narrow.
Examples of the material 6 disposed in the recess 33 include foam metal, foam silicon rubber, sintered metal, spherical metal, and the like.

In the embodiment shown in FIG. 9, another member 39 in which an outer peripheral portion 35 f from the outer peripheral surface 35 a of the main body portion 35 of the discharge roller 3 to a predetermined depth is detachably fixed to a portion closer to the shaft core side. Formed from. The member 39 constituting the outer peripheral portion 35f forms a small chamber 38 that primarily stores the adhesive guided from the one branch pipe 35c, and in order to guide the adhesive from the small chamber 38 to the recess 33, There are branch pipes 35c ', 35c', 35c 'for branching the branch pipe 35c into a plurality of branches. The number of the branch pipes 35c ′ is larger than that of the pipes for introducing the adhesive into the small chamber 38.
With such a configuration, the arrangement and number of the branch pipes 35c ′ can be freely determined within the area of the small room 38, and the design of the flow path for guiding the adhesive to the recess 33 is further facilitated. In addition, since the arrangement and the number of the branch pipes 35c ′ can be easily determined, it becomes possible to fill the recess 33 with the liquid more evenly. If the liquid in the entire recess 33 is uniform, the liquid is evenly discharged from the surface plate 31 covering the recess 33, and more uniform coating can be performed. Further, since the small chamber 38 is provided in the separate member 39, the separate member 39 can be replaced with a large change in the coating pattern, and the roller main body 32 is not replaced.
The outer peripheral portion 35f of the main body portion 35 of the discharge roller 3 may be formed from a plurality of members 39 arranged in series in the circumferential direction of the discharge roller 3, or may be continuously arranged in the circumferential direction of the discharge roller 3. The single member 39 may be formed.

The small chamber 38 in the discharge roller 3 shown in FIG. 9 is provided closer to the rotating shaft than the position of the recess 33 in the radial direction of the discharge roller 3. One or a plurality of conduits 35c for introducing the adhesive into the small chamber 38 may be used.
It is preferable that the number of branch pipes 35 c ′ communicating between the small chamber 38 and the inside of the recess 33 is larger than the number of pipe lines 35 c for introducing the adhesive into the small chamber 38. When the number of the pipes 35c for introducing the adhesive into the small chamber 38 is one, the number of the branch pipes 35c ′ communicating the small chamber 38 and the inside of the recess 33 can be set to 2 to 30, for example. When the number of the pipes 35c for introducing the adhesive into the chamber 38 is two, the number of the branch pipes 35c ′ that connect the small chamber 38 and the inside of the recess 33 can be 3 to 60, for example.
In addition, the path | route which guides the hot-melt-adhesive supplied from the supply means 2 to the recessed part 33 is not restrict | limited as long as an adhesive can be guide | induced to the recessed part 33, It can deform | transform variously.

The adhesive coating apparatus 1A shown in FIG. 10 includes a discharge roller 3A having the same configuration as the discharge roller 3 shown in FIG. 1 except that it rotates following the rotation of the nip roller 42. The adhesive coating apparatus 1 </ b> A does not include the transfer roller 41.
In this adhesive coating apparatus 1A, the hot melt adhesive is applied directly from the outer surface of the discharge roller 3A to the belt-like sheet S moving between the discharge roller 3A and the nip roller 42. Also in this adhesive coating apparatus 1A, the surface plate 31 constituting the outer surface of the discharge roller 3A is made of a porous body over the entire portion covering the concave portion positioned below, and hot from the entire portion covering the concave portion. A melt adhesive is discharged. Therefore, the same effect as the coating apparatus 1 mentioned above is show | played.

In addition, in the coating apparatus 1 mentioned above, although the whole area of the plane direction (direction orthogonal to the thickness direction) used the surface plate 31 which consists of porous bodies, parts other than the part which covers the recessed part 33 consist of non-porous bodies. A surface plate may be used. For example, a punching metal that is not opened except for a portion that covers the recess 33, or a hole in which a hole other than the portion that covers the recess 33 is sealed with a masking material may be used.
The opening shape of the concave portion 33 can be an arbitrary shape, such as a shape whose contour is composed only of a straight line, a shape whose contour is composed of a straight line and a curve, a shape whose contour is composed of only a curve, and the like. Specifically, a circular shape, an oval shape, a heart shape, a saddle shape, an oval shape with a narrowed central portion, a rectangular shape, a rhombus shape, or the like can be used.

Moreover, the liquid coating apparatus of this invention may apply another liquid as a liquid instead of an adhesive agent. Examples of liquids other than adhesives include oils, emulsions, creams, humectants, and lotions.
In addition, the liquid coating apparatus of the present invention is also preferably used for applying an adhesive to the constituent material of the absorbent article in the manufacturing process of the absorbent article. The constituent material to which the adhesive is applied can be joined to another constituent material through the adhesive. Examples of the constituent material of the absorbent article include, but are not limited to, a top sheet, an absorbent body, a back sheet, a sheet for forming a wing portion, a sheet for forming a three-dimensional gather, and the like.

  Further, the description omitted in one embodiment of the present invention and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment are appropriately described in the embodiment. Can be substituted for each other.

FIG. 1 is a perspective view showing a main part of an embodiment of the liquid coating apparatus according to the present invention. FIG. 2 is a cross-sectional view of a main part showing a configuration in the vicinity of the outer peripheral surface of the discharge roller in the same embodiment. FIG. 3 is a perspective view showing a roller body in the embodiment. FIG. 4A is a view of the surface plate in the embodiment viewed from the normal direction, and FIG. 4B is a view of the recess in the embodiment viewed from the normal direction of the bottom surface of the recess. FIG.4 (c) is a top view of the strip | belt-shaped sheet | seat which shows the coating pattern of the liquid (adhesive) in the same embodiment. Fig.5 (a)-FIG.5 (c) are figures which show other embodiment of the liquid coating apparatus of this invention, and Fig.5 (a) is a plane which shows the coating pattern of a liquid (adhesive). FIG. 5 and FIG. 5B are views in which the concave portion is viewed from the normal direction of the bottom surface of the concave portion, and FIG. 5C is a schematic cross-sectional view taken along the line I-I in FIG. 6 (a) and 6 (b) are diagrams showing still another embodiment of the liquid processing apparatus of the present invention, and FIG. 6 (a) is a view of the concave portion from the normal direction of the bottom surface of the concave portion. FIG. 6B is a schematic cross-sectional view taken along the line II-II in FIG. 7 (a) and 7 (b) are diagrams showing still another embodiment of the liquid coating apparatus of the present invention, and FIG. 7 (a) shows a coating pattern of liquid (adhesive). FIG. 7B is a plan view of the concave portion viewed from the normal direction of the bottom surface of the concave portion. 8 (a) and 8 (b) are views showing still another embodiment of the liquid coating apparatus of the present invention, and FIG. 8 (a) is a liquid permeable diffusion filled in the recess and the recess. FIG. 8B is a schematic cross-sectional view taken along the line III-III in FIG. 8A. FIG. 8C is a schematic diagram showing a method for evaluating transmission diffusibility. FIG. 9 is a view (corresponding to FIG. 2) showing still another embodiment of the liquid coating apparatus of the present invention. FIG. 10 is a schematic side view showing still another embodiment of the liquid coating apparatus of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid coating apparatus 2 Supply means 3 Discharge roller 31 Surface plate 32 Roller main body 33 Recess 35 Main part 36 Pattern shape plate 36a Opening part 4 Transfer means 41 Transfer roller 5 Hot melt adhesive (liquid)
50 Adhesive coating part (liquid coating part)

Claims (8)

A liquid coating apparatus that includes a discharge roller that discharges a liquid supplied from a supply unit in a predetermined pattern, and that applies the liquid discharged from the discharge roller to a moving workpiece.
The discharge roller includes a surface plate that forms an outer peripheral portion, and a roller body that forms a portion inside the surface plate in the discharge roller,
On the outer peripheral portion of the roller body, a recess having a predetermined shape is formed for diffusing the liquid introduced through the inside of the roller body in a direction along the surface of the surface plate,
The surface plate is made of a porous body in the entire area covering the recess, and the liquid is discharged from the entire area of the surface plate covering the recess ,
The roller body has a main body portion constituting a portion close to the rotation axis, and a pattern-shaped plate having an opening of a predetermined shape and an inner portion of the opening forming the recess,
A liquid coating apparatus, wherein an auxiliary plate is disposed inside an opening of the pattern-shaped plate, and an inner portion of the opening and an outer portion of the auxiliary plate form the recess . The liquid coating apparatus according to claim 1, wherein an opening shape of the concave portion is substantially the same as a shape of a liquid coating portion formed on the workpiece. The liquid coating apparatus according to claim 1, wherein the pattern-shaped plate is detachably fixed to the main body portion. Inside the recess, the liquid coating according to any one of the portions equal or better material claim wherein are arranged 1-3 for transmission diffusion of the liquid covers the concave portion of said surface plate Engineering equipment. The discharge roller has a small chamber on the rotating shaft side from the position of the concave portion in the radial direction, and the liquid introduced into the small chamber is introduced into the concave portion by a plurality of branch pipes. It has been made as a liquid coating apparatus according to any one of claims 1-4. Wherein the liquid, the liquid coating apparatus according to any one of claim 1 to 5 which is an adhesive. A method for producing an absorbent article having an adhesive portion formed by applying an adhesive on a clothing contact surface and being used by being fixed to clothing through the adhesive portion,
The manufacturing method of an absorbent article which comprises the process of apply | coating an adhesive agent to the sheet material which comprises the said clothing contact surface with the liquid coating apparatus of Claim 6 . The absorption which comprises the process of apply | coating an adhesive agent to the constituent material of an absorbent article, and the process of joining this constituent material with another constituent material through this adhesive agent by the liquid coating apparatus of Claim 6. A method for producing a functional article.

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