JP2018094471A - Liquid application device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily recognize a timing of discharging a liquid from a porous body, and suppress generation of such as application failure in starting or the like.SOLUTION: A liquid application device 1 discharges a hot-melt adhesive in a predetermined shape and applies on a band-like sheet S. The liquid application device 1 includes: a roll main body 31 having a recessed part for spreading the hot-melt adhesive; a surface plate 30 which covers the recessed parts 32, 32 and permeates the hot-melt adhesive in the recessed parts 32; a pressure sensor 8 which detects a pressure when the hot-melt adhesive distributes; and a control part 9 which moves the band-like sheet S based on the pressure in a discharge roll 3 and applies the hot-melt adhesive on the band-like sheet S. The roll main body 31 includes a first flow passage inside, and an introduction hole 35h which connects a branch conduit 33d and the recessed part 32 and has a thinner flow passage than the branch conduit 33d. When it is detected that a pressure increase in passing the introduction hole 35h stops, movement of the band-like sheet is started after a predetermined time has passed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a liquid coating apparatus.

  Conventionally, as a liquid coating apparatus that applies a liquid such as an adhesive to a moving object to be coated in a predetermined pattern, a porous body that forms an outer surface, and a discharge unit that forms an inner part of the porous body A main body, and after the liquid supplied through the inside of the discharge unit main body is once accumulated in a recess formed on the outer peripheral surface of the discharge unit main body, the liquid is discharged from a porous body covering the recess There has been known a liquid coating apparatus having a discharged portion (for example, see Patent Document 1).

  The applicant can first uniformly apply the liquid discharged through the surface plate of the discharge roll including the roll body having the concave portion and the surface plate covering the concave portion. A coating apparatus was proposed (see Patent Document 2).

JP 2014-54588 A Patent No. 5324155

  However, in the liquid coating apparatus described in Patent Document 1, since the liquid flows into the recess formed in the outer peripheral surface of the discharge unit main body and diffuses in the recess, the recess is filled with the liquid and the liquid is a porous body. It is difficult to understand when it is discharged from Therefore, there is a possibility of causing a coating failure at the time of start-up. In addition, if the apparatus is stopped in a state where the liquid is filled in the concave portion, the liquid filled in the concave portion may ooze out of the porous body with the passage of time.

  In addition, the liquid coating apparatus described in Patent Document 2 does not describe anything about the timing at which the liquid is discharged from the surface plate that is a porous body or the liquid oozing from the surface plate after the apparatus is stopped. There was room for further improvement.

  Therefore, the subject of this invention is providing the liquid coating apparatus which can eliminate the fault which the prior art mentioned above has.

  The present invention is a liquid coating apparatus that discharges liquid supplied from a supply unit into a predetermined shape and applies it to an object to be coated that moves on a production line. A discharge part main body for diffusing the liquid supplied from the inside of the concave part, and a discharge part having a porous body that covers the concave part of the discharge part main body over the entire region and allows the liquid diffused in the concave part to pass therethrough And a pressure sensor for detecting a pressure when the liquid flows in the discharge portion, and directing the workpiece on the manufacturing line to the discharge portion based on the pressure in the discharge portion detected by the pressure sensor. And a control unit that applies liquid to the object to be coated, and the discharge unit main body includes a first flow path through which the liquid supplied from the supply unit circulates, A second channel having a smaller channel than the first channel by connecting the channel and the recess. And when the pressure sensor detects that the liquid supplied from the supply unit through the first flow path passes through the second flow path, the control unit detects, The present invention provides a liquid coating apparatus for starting the movement of the object to be coated on the production line after a predetermined time has elapsed.

  Further, the present invention is a liquid coating apparatus for discharging a liquid supplied from a supply unit into a predetermined shape and applying it to an object to be moved that moves on a production line, wherein the supply is performed with a recess formed on an outer surface. A discharge part main body for diffusing the liquid supplied from the part in the concave part, and a porous body that covers the concave part of the discharge part main body over the entire area and allows the liquid diffused in the concave part to pass therethrough And a pressure sensor for detecting a pressure when the liquid flows in the discharge portion, and stopping the movement of the workpiece on the production line based on the pressure in the discharge portion detected by the pressure sensor. And a control unit that controls the operation of the supply unit, and the discharge unit main body includes a first flow path through which the liquid supplied from the supply unit is circulated, the first flow path, and the recess. And a second flow path that is narrower than the first flow path. The supply unit is capable of supplying a liquid and recovering the supplied liquid, and when the control unit stops the movement of the object to be discharged on the production line, The supply unit causes the liquid in the discharge part to be collected through the second flow path and the first flow path, and the pressure rises when the liquid in the recess passes through the second flow path. When a sensor detects, the liquid coating apparatus which stops collection | recovery of the liquid in the said discharge part by the said supply part is provided.

  According to the liquid coating apparatus of the present invention, it is easy to understand the timing at which the liquid is discharged from the porous body, and it is possible to suppress the occurrence of poor coating at the time of start-up. Moreover, according to the liquid coating apparatus of this invention, the liquid leakage from the porous body of the liquid at the time of a stop can be suppressed.

FIG. 1 is a schematic view showing a cross section of a discharge roll of a liquid coating apparatus according to an embodiment of the present invention. FIG. 2 is a cross-sectional view schematically showing a cross section of the discharge roll of the liquid coating apparatus shown in FIG. FIG. 3 is a perspective view showing a state in which a hot-melt adhesive having a predetermined shape is applied to the belt-like sheet using the discharge roll shown in FIG. FIG. 4A is a schematic view showing a cross section of the exterior portion of the discharge roll in a state where the hot melt adhesive fills the diffusion portion, and FIG. 4B is a diagram showing the hot melt adhesive filling the diffusion portion and the recess. It is the schematic diagram which showed the cross section of the exterior part of the discharge roll of the state made. FIG. 5A is a schematic view showing a cross section of the exterior portion of the discharge roll in a state before the hot melt adhesive is recovered from the recess, and FIG. 5B is a view of the hot melt adhesive recovered from the recess. It is the schematic diagram which showed the cross section of the exterior part of the discharge roll of a state. FIG. 6 is a diagram illustrating a pressure change inside the discharge roll supplied with the hot melt adhesive and an operating state of the pump. FIGS. 7A and 7B are schematic views showing a cross section of a die coater which is another embodiment of the discharge section of the liquid coating apparatus of the present invention.

  Hereinafter, the liquid coating apparatus of the present invention will be described based on preferred embodiments with reference to the drawings. As shown in FIG. 1, a liquid coating apparatus 1 according to an embodiment of the present invention discharges a liquid supplied from a supply unit 2 into a predetermined shape and applies it to a workpiece to be moved on a production line. It is a coating device to work.

  Examples of the liquid to be applied to the object to be coated include an adhesive such as a hot melt adhesive and a liquid having viscosity such as an oil. 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). Examples of the adhesive other than the hot melt adhesive include adhesives such as low density polyethylene, polyvinyl acetate, silicon resin, and glue. Examples of the viscous liquid include oils, emulsions, creams, humectants, lotions and the like. The viscosity of these liquids is preferably 1 CPS or more, more preferably 10 CPS or more, preferably 10000 CPS or less, more preferably 8000 CPS or less, preferably 1 CPS or more and 10000 CPS or less, more preferably 10 CPS or more and 8000 CPS or less.

  Examples of the object to be coated with the liquid include, for example, a nonwoven fabric, a woven fabric, a resin film, a sheet made of a knitted fabric, or a laminate in which these sheet-like materials are laminated in two or more layers, Examples include articles formed by further laminating or sandwiching other members on 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.

  In addition, as a production line in which an object to be coated with a liquid moves, for example, an absorbent article having an adhesive portion made of a hot melt adhesive and being fixed to clothing through the adhesive portion is used. Examples include production lines. 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 liquid is applied to the belt-shaped raw sheet of the sheet constituting the clothing contact surface, or to the band-shaped or non-band-shaped raw sheet of the sheet laminated with other materials. A hot melt adhesive is applied using a coating apparatus to form an adhesive portion having a predetermined shape. Other than that is the same as the manufacturing method of the conventional absorbent article.

  In the following, a liquid coating apparatus 1 using a hot melt adhesive as a liquid and a non-woven belt-like sheet S as an object to be coated will be described as an example. Moreover, in the liquid coating apparatus 1, the discharge part which discharges the liquid supplied from a supply part to a predetermined shape is the discharge roll 3, the discharge part main body in which the recessed part was formed in the outer surface is the roll main body 31, and a discharge part The porous body covering the concave portion of the main body over the entire area is the surface plate 30.

  As shown in FIGS. 1 and 3, the liquid coating apparatus 1 includes a roll main body 31 in which concave portions 32 and 32 are formed on the outer peripheral surface and the hot melt adhesive supplied from the supply portion 2 is diffused in the concave portions 32 and 32. And the discharge roll 3 having a surface plate 30 that covers the entire area of the recesses 32, 32 of the roll body 31 and allows the hot melt adhesive diffused in the recesses 32, 32 to pass therethrough. A pressure sensor 8 for detecting the pressure when the hot melt adhesive flows, and the belt-like sheet S on the production line is moved toward the discharge roll 3 based on the pressure in the discharge roll 3 detected by the pressure sensor 8; And a control unit 9 for applying a hot melt adhesive to the belt-like sheet S. In the liquid coating apparatus 1, the control unit 9 also controls the stop of the movement of the belt-like sheet S on the production line and the operation of the supply unit 2 based on the pressure in the discharge roll 3 detected by the pressure sensor 8. ing. In this embodiment, in addition to them, the liquid coating apparatus 1 includes a first drive source 4 that rotates the discharge roll 3, a receiving roll 5 that is disposed to face the discharge roll 3, and the receiving roll 5. A second drive source 6 to be moved, a contact / separation mechanism 7 for contacting and separating the receiving roll 5 with respect to the discharge roll 3, and a separation mechanism (not shown) for separating the belt-like sheet S from the discharge roll 3. These are controlled by the control unit 9.

  As shown in FIG. 1, the supply unit 2 that supplies hot melt adhesive to the discharge roll 3 connects the tank 20 containing the hot melt adhesive and the tank 20 and the discharge roll 3 in the liquid coating apparatus 1. And a pump 22 that feeds the hot-melt adhesive accommodated in the tank 20 to the discharge roll 3 through the supply pipe 21. A heating means (not shown) such as a heater is incorporated in the tank 20, and the internal temperature of the tank 20 can be adjusted by a heating means such as a heater. The tank 20 is connected to a supply pipe 21 via a valve 20V. The valve 20 </ b> V is electrically connected to the control unit 9, and opening / closing is controlled by the control unit 9. One end of the supply pipe 21 is connected to the valve 20 </ b> V of the tank 20, and the other end is connected to a shaft portion 33 s on one side of a main body portion 33 described later of the discharge roll 3. The pump 22 is connected to the supply pipe 21 on the downstream side of the valve 20V. The pump 22 has a drive motor 22M that can rotate forward and backward, and supplies the hot melt adhesive to the discharge roll 3 through the supply pipe 21 by rotating the drive motor 22M forward, The hot melt adhesive remaining in the discharge roll 3 can be sucked and collected through the supply pipe 21 by rotating the drive motor 22M in the reverse direction. The pump 22 is electrically connected to the control unit 9, and the rotation of the drive motor 22 </ b> M is controlled by the control unit 9. As described above, in the liquid coating apparatus 1, the supply unit 2 can supply the hot melt adhesive and collect the supplied hot melt adhesive.

  As shown in FIG. 2, the discharge roll 3 that discharges the supplied hot melt adhesive to the belt-like sheet S includes a surface plate 30 that constitutes the outer peripheral surface of the discharge roll 3 and the discharge plate 3 in the liquid coating apparatus 1. The roll 3 includes a roll main body 31 that constitutes a portion on the inner side (axial core side) of the surface plate 30. As shown in FIG. 3, a plurality of concave portions 32, 32 having a pattern corresponding to the predetermined shape of the discharged hot melt adhesive 11 is formed on the outer peripheral surface of the roll body 31. In the liquid coating apparatus 1, two concave portions 32 are formed at a predetermined interval in the circumferential direction of the outer peripheral surface of the roll body 31. As shown in FIG. 3, the “pattern corresponding to the predetermined shape” refers to the contour of the recess 32 when the recess 32 of the discharge roll 3 is viewed from the normal direction, as shown in FIG. 3. It means that the outer periphery of the applied shape of the hot melt adhesive 11 to be discharged coincides. In addition, the roll body 31 connects the first flow path through which the hot melt adhesive supplied from the supply unit 2 is circulated, and the first flow path and the recesses 32 and 32 to the inside of the roll body 31 than the first flow path. In the liquid coating apparatus 1, as shown in FIG. 2, the first flow path is a branch pipe 33d described later, and the second flow path is described later. This is the introduction hole 35h.

  As shown in FIG. 2, the surface plate 30 constituting the outer peripheral surface of the discharge roll 3 is attached to and detached from the outer peripheral surface of the roll body 31 so as to cover the entire area of the recesses 32, 32 of the roll body 31. It is attached as possible. Further, the surface plate 30 covers the outer peripheral surface of the second auxiliary plate 35 described later in the liquid coating apparatus 1. The surface plate 30 is made of a porous material having a large number of micropores penetrating in the thickness direction, and a liquid to be applied (hot melt adhesive in the liquid coating apparatus 1) passes through the micropores. And is transparent. As the porous material constituting the surface plate 30, a wire net, punching metal, etching hole material, sintered metal, ceramics, and a laminate thereof can be used.

The average pore diameter of the fine pores of the porous material constituting the surface plate 30 is preferably 0.01 mm to 2 mm, particularly preferably 0.03 mm to 0.8 mm. The opening area ratio of the micropores of the porous material is preferably 1% to 80%, particularly preferably 5% to 60%. In addition, the area of each fine pore of the porous material is preferably 0.002 mm ² or more and 3.2 mm ² or less, particularly preferably 0.004 mm ² or more and 0.5 mm ² or less.
The average pore diameter and the area of the micropores of the porous material constituting the surface plate 30 are measured as follows.
The average pore diameter of the micropores is determined by observing the surface plate 30 from directly above with an optical microscope, measuring at least 10 openings on the surface, and S (hole area) = PAI / 4 × d ² (PAI = Let d calculated in 3.14) be the equivalent circle diameter and take the average of these. The area of the micropore can be easily measured by, for example, using a Keyence digital HD microscope VH-7000 and surrounding an arbitrary point on the observed screen.

  As shown in FIG. 2, the roll main body 31 constituting the inner side (axial core side) portion than the surface plate 30 is composed of a main body part 33 including an axial core part and a main body part 33 of the liquid coating apparatus 1. A first auxiliary plate 34 disposed on the outer peripheral surface and having an opening 34a, a second auxiliary plate 35 disposed on the outer peripheral surface of the first auxiliary plate 34 and having an introduction hole 35h, and the second auxiliary plate And a pattern shape plate 36 having a pattern opening 36a corresponding to a predetermined shape.

  As shown in FIG. 2, the main body portion 33 including the shaft core portion is formed in a substantially cylindrical shape in the liquid coating apparatus 1, and the rotation axis direction X <b> 1 of the discharge roll 3 (hereinafter simply referred to as “rotation axis direction X <b> 1”). Are also rotatably supported by the unit frames 10 and 10 (see FIG. 1). A connection portion (not shown) to which the supply pipe 21 of the supply portion 2 is connected is disposed on the shaft portion 33s on one side of the main body portion 33. The connection portion (not shown) In the apparatus 1, it is comprised by the rotary joint which connects the roll main body 31 and the supply pipe | tube 21 of the supply part 2 rotatably. By connecting the roll main body 31 and the supply pipe 21 of the supply unit 2 using a rotary joint, the roll main body 31 and the supply pipe 21 of the supply unit 2 can be easily and rotatably coupled.

  A flow path through which the hot melt adhesive is circulated is formed inside the main body portion 33, and as the flow path, in the liquid coating apparatus 1, a main pipe that extends in the rotation axis direction X <b> 1 at the shaft core portion thereof. A path 33m (a pair of main pipelines 33m and 33m in the liquid coating apparatus 1) and a plurality of branch pipelines 33d extending radially from the main pipelines 33m toward the outer peripheral surface of the main body portion 33 are provided. ing. Each branch pipe 33 d forms a first flow path in the liquid coating apparatus 1. 1 and 2 show a cross section of one branch pipe 33d among a plurality of branch pipes 33d extending from each main pipe 33m formed inside the main body portion 33.

  Further, heating means (not shown) such as a cartridge heater is incorporated in the main body portion 33, and the temperature inside the main body portion 33 can be adjusted by the heating means such as the cartridge heater. By adjusting the temperature inside the main body portion 33, for example, the hot melt adhesive flowing through the inside of the main body portion 33 can be adjusted so as to have a viscosity that is easy to flow.

  As shown in FIG. 2, in the liquid coating apparatus 1, the pair of main pipelines 33m and 33m extending in the rotation axis direction X1 are arranged opposite to each other so as to be symmetric with respect to the axis. Has been. In the liquid coating apparatus 1, each main pipe line 33m is formed from a shaft part 33s on one side of the main body part 33 in the rotation axis direction X1 to a substantially central part in the rotation axis direction X1. As the outer diameter of each main pipe line 33m, from the viewpoint of reducing the amount of hot melt adhesive flowing through the inside and shortening the filling time for filling the inside of each main pipe line 33m, etc. In the liquid coating apparatus 1, it is preferably φ6 mm or more and φ25 mm or less.

  As shown in FIG. 2, a plurality of branch pipes 33 d extending radially from each main pipe 33 m are formed from the main pipe 33 m to the outer peripheral surface of the main body portion 33 in the liquid coating apparatus 1. . That is, each branch pipe 33 d is formed by communicating each main pipe 33 m and the outer peripheral surface of the main body portion 33. The outer diameter of each branch pipe 33d is selected from the viewpoints of reducing the amount of hot melt adhesive to be held and shortening the filling time for hot melt adhesive to fill the inside of each branch pipe 33d. In the processing apparatus 1, it is preferably φ6 mm or more and φ25 mm or less.

  As shown in FIG. 2, the first auxiliary plate 34 disposed on the outer peripheral surface of the main body portion 33 is the entire outer peripheral surface of the main body portion 33 (the shaft portions 33 s and 33 s of the main body portion 33). The entire outer peripheral surface excluding) can be covered. The first auxiliary plate 34 is fixed to the main body portion 33 by a fixing tool (not shown) in a state where the entire outer peripheral surface of the main body portion 33 is covered. The first auxiliary plate 34 does not necessarily need to cover the entire outer peripheral surface of the main body portion 33. For example, the first auxiliary plate 34 is shorter than the main body portion 33 in the rotation axis direction X. Also good. Further, when the first auxiliary plate 34 is fixed to the main body portion 33, hot melt adhesive that communicates with the plurality of branch conduits 33 d and flows in from the plurality of branch conduits 33 d is applied to the first auxiliary plate 34. An opening 34 a (a pair of openings 34 a and 34 a in the liquid coating apparatus 1) that temporarily accumulates and diffuses along the outer surface of the main body portion 33 is formed. Each opening 34a is formed so as to penetrate the first auxiliary plate 34 in the thickness direction.

  As shown in FIG. 2, in the liquid coating apparatus 1, the second auxiliary plate 35 is formed on the outer peripheral surface of the first auxiliary plate 34 so as to cover the entire outer peripheral surface. The second auxiliary plate 35 is fixed to the first auxiliary plate 34 with a fixture (not shown) in a state where the entire outer peripheral surface of the first auxiliary plate 34 is covered. The second auxiliary plate 35 does not necessarily need to cover the entire outer peripheral surface of the first auxiliary plate 34. For example, with respect to the rotation axis direction X, the second auxiliary plate 35 is more than the first auxiliary plate 34. It may be shorter.

  The openings 34a of the first auxiliary plate 34 described above are hot-melt bonded to the outer surface of the main body portion 33, the inner portion 34r of the openings 34a of the first auxiliary plate 34, and the inner surface of the second auxiliary plate 35. A diffusion portion 37 that diffuses the agent along the outer surface of the main body portion 33 is configured, and the diffusion portion 37 has a uniform depth (same as the thickness of the first auxiliary plate 34).

  Further, when the second auxiliary plate 35 is fixed to the first auxiliary plate 34, the hot melt adhesive filled with the diffusion portions 37, 37 is circulated to the second auxiliary plate 35. A plurality of introduction holes 35h are formed. Each introduction hole 35h is formed through the second auxiliary plate 35, and the liquid coating apparatus 1 constitutes a second flow path.

  The inner diameter of each introduction hole 35h that is the second flow path is uniform in the thickness direction of the second auxiliary plate 35, and the inner diameter of each introduction hole 35h is larger than the inner diameter of each branch pipe 33d that is the first flow path. Is formed to be smaller. That is, each introduction hole 35h has a narrower flow path than each branch pipe 33d. The ratio of the inner diameter of each introduction hole 35h to the inner diameter of each branch pipe 33d ((inner diameter of introduction hole 35h / inner diameter of branch pipe 33d) × 100) is preferably 0.4% or more, more preferably 1%. It is preferably 75% or less, more preferably 60% or less, preferably 0.4% or more and 75% or less, more preferably 1% or more and 60% or less.

  The cross-sectional area of each introduction hole 35h that is the second flow path is formed to be smaller than the cross-sectional area of each branch pipe 33d that is the first flow path. The ratio of the cross-sectional area of each introduction hole 35h to the cross-sectional area of each branch pipe 33d ((cross-sectional area of introduction hole 35h / cross-sectional area of branch pipe 33d) × 100) is preferably 1% or more, more preferably It is 5% or more, preferably 90% or less, more preferably 50% or less, preferably 1% or more and 90% or less, more preferably 5% or more and 50% or less.

And each introducing hole 35h is preferably provided so that the ratio of one per bottom area 0.5 cm ² or more 10 cm ² or less of each recess 32.

  As shown in FIG. 2, the pattern shape plate 36 disposed on the outer peripheral surface of the second auxiliary plate 35 is formed so as to cover the entire outer peripheral surface of the second auxiliary plate 35 in the liquid coating apparatus 1. Yes. The pattern shape plate 36 is fixed to the second auxiliary plate 35 with a fixture (not shown) in a state where the outer peripheral surface of the second auxiliary plate 35 is covered. The pattern shape plate 36 does not necessarily need to cover the entire outer peripheral surface of the second auxiliary plate 35. For example, the pattern shape plate 36 is shorter than the second auxiliary plate 35 in the rotation axis direction X. It may be. In addition, when the pattern shape plate 36 is fixed to the second auxiliary plate 35, the pattern shape plate 36 is temporarily connected with the plurality of introduction holes 35h and temporarily supplied with hot melt adhesive flowing in from the plurality of introduction holes 35h. Thus, an opening 36a (a pair of openings 36a, 36a in the liquid coating apparatus 1) is formed to diffuse along the outer surface of the reservoir second auxiliary plate 35. Each opening 36a penetrates the pattern shape plate 36 in the thickness direction and is formed in a pattern shape corresponding to a predetermined shape.

Each of the openings 36 a of the pattern-shaped plate 36 described above is formed of hot melt adhesive between the outer surface of the second auxiliary plate 35, the inner portion 36 r of each of the openings 36 a of the pattern-shaped plate 36, and the inner surface of the surface plate 30. Each recess 32 is configured to temporarily accumulate and diffuse along the outer surface of the second auxiliary plate 35, and each recess 32 has a uniform depth (the same as the thickness of the pattern-shaped plate 36).
Further, the volume of each recess 32 is larger than the volume of each diffusion portion 37. The ratio of the volume of each recess to the volume of each diffusion portion 37 ((volume of each recess / volume of each diffusion portion 37) × 100) is preferably 30% or more, more preferably 50% or more.

The thickness of the surface plate 30 is preferably 0.05 times or more and 20 times or less with respect to the depth of the concave portions 32 and 32 of the roll body 31 from the viewpoint of uniformly coating the entire region to be coated. More preferably, it is 0.1 to 2 times. From the same viewpoint, the thickness of the surface plate 30 as a whole is preferably 0.01 mm to 20 mm, more preferably 0.02 mm to 10 mm, and still more preferably 0.05 mm to 2 mm.
The thickness of the first auxiliary plate 34 is preferably 0.25 mm or more and 5 mm or less, more preferably 0.5 mm or more and 2 mm or less because the thickness is the depth of the diffusion portion 37.
The thickness of the second auxiliary plate 35 is preferably 0.25 mm or more and 3 mm or less, more preferably 0.5 mm or more and 2 mm or less because the thickness is the depth of each introduction hole 35h.
The thickness of the pattern shape plate 36 is preferably 0.1 mm or more and 5.0 mm or less, more preferably 0.5 mm or more and 1.0 mm or less because the thickness is the depth of the concave portions 32 and 32 of the roll body 31. is there.

  By providing each diffusing portion 37 between the branch conduit 33d that is the first flow path and the introduction hole 35h that is the second flow path, the hot melt adhesive can be made to uniformly flow into the respective recesses 32. In addition, by making the volume of each recess 32 larger than the volume of the diffusion portion, the hot melt adhesive is gradually diffused outward, so that the hot melt is uniformly distributed in the recess 32. Adhesive can be allowed to flow.

  As shown in FIG. 1, the pressure sensor 8 that detects the pressure in the flow path of the discharge roll 3 when the hot melt adhesive circulates in the discharge roll 3 that is a discharge unit is as follows. It is connected to the supply pipe 21 of the supply unit 2. The pressure sensor 8 is connected to the supply pipe 21 in the vicinity of the shaft portion 33 s on one side of the main body portion 33 of the discharge roll 3. The pressure sensor 8 is preferably arranged as close to the discharge roll 3 as possible from the viewpoint of detecting the pressure in the discharge roll 3.

  As shown in FIG. 1, the first drive source 4 that rotates the discharge roll 3 is connected to the shaft portion 33 s on the other side of the roll body 31 via the timing belt 40 in the liquid coating apparatus 1. The first drive source 4 is electrically connected to the control unit 9, and the rotation is controlled by the control unit 9.

  As shown in FIG. 1, the receiving roll 5 that nips and conveys the belt-like sheet S with the discharge roll is formed in a substantially cylindrical shape in the liquid coating apparatus 1, and is provided at both ends of the rotation axis direction X2. The shaft portions 50 s and 50 s are rotatably supported by the unit frames 10 and 10. As shown in FIG. 3, the receiving roll 5 is disposed opposite to the discharge roll 3 in the liquid coating apparatus 1, and the discharge roll 3 nips the belt-like sheet S and the hot roll adhesive is applied by the discharge roll 3. The belt-like sheet S to be coated is conveyed. The receiving roll 5 is formed of a sponge in the liquid coating apparatus 1.

  As shown in FIG. 1, the second drive source 6 that rotates the receiving roll 5 is connected to the shaft portion 50 s on the other side of the receiving roll 5 via the timing belt 60 in the liquid coating apparatus 1. The second drive source 6 is electrically connected to the control unit 9, and the rotation is controlled by the control unit 9.

  As shown in FIG. 1, the contact / separation mechanism 7 that contacts and separates the receiving roll 5 with respect to the discharge roll 3 includes a pair of air cylinders 70 and 70 in the liquid coating apparatus 1. The pair of air cylinders 70, 70 is configured such that the receiving roll 5 comes into contact with or separates from the discharge roll 3 as each air cylinder 70 expands and contracts. The pair of air cylinders 70, 70 (contact / separation mechanism 7) is electrically connected to the control unit 9, and the expansion / contraction state is controlled by the control unit 9. In the liquid coating apparatus 1, the receiving roll 5 comes into contact with the discharge roll 3 by extending the pair of air cylinders 70, 70, and the receiving roll 5 is removed from the discharge roll 3 by contracting the pair of air cylinders 70, 70. Separate.

  In the liquid coating apparatus 1, the separation mechanism that separates the belt-like sheet S from the discharge roll 3 includes a pair of side rolls (not shown) that guide the belt-like sheet S between the discharge roll 3 and the receiving roll, and the pair. And a lifting mechanism (not shown) for raising and lowering the side roll (not shown). A pair of side rolls (not shown) nips the belt-like sheet S and guides the belt-like sheet S to the nip portion between the discharge roll 3 and the receiving roll. The elevating mechanism (not shown) moves a pair of side rolls (not shown) in a direction away from the discharge roll 3 to separate the belt-like sheet S from the discharge roll 3. In the liquid coating apparatus 1, the elevating mechanism (not shown) moves the pair of side rolls (not shown) in the direction in which the pair of air cylinders 70 and 70 are contracted to separate the belt-like sheet S from the discharge roll 3. .

  Next, when the liquid coating apparatus 1 controlled by the control unit 9 applies the hot melt adhesive to the strip sheet S and stops the production line, the liquid coating apparatus 1 controlled by the control unit controls hot. The recovery operation of the melt adhesive will be described. Below, the liquid coating apparatus 1 incorporated in the production line for absorbent articles will be described as an example.

  First, the operation of applying the hot melt adhesive onto the belt-like sheet S by the liquid coating apparatus 1 controlled by the control unit 9 will be described with reference to FIGS. 4 and 6 in addition to FIGS. . FIG. 4A is a schematic view showing a cross-section of the exterior portion of the discharge roll 3 in a state where the hot melt adhesive fills the diffusion portions 37 and 37. FIG. 4B is a schematic view showing a cross section of the exterior portion of the discharge roll 3 in a state where the hot melt adhesive fills the diffusion portions 37 and 37 and the recesses 32 and 32. FIG. 6 is a diagram showing the pressure change of the hot melt adhesive supplied to the discharge roll 3, the operating state of the pump 22, and the operating state of the production line.

  First, in the liquid coating apparatus 1 shown in FIG. 1, the hot melt adhesive is put into the tank 20 of the supply unit 2, the inside of the tank 20 is heated using heating means such as a heater, and the introduced hot melt adhesive is added. Leave in a molten state. When the hot melt adhesive is in a molten state, the control unit 9 provided in the liquid coating apparatus 1 controls the valve 20V of the tank 20 to open the valve 20V. Moreover, the control part 9 with which the liquid coating apparatus 1 is provided controls the drive source (not shown) connected to the drive motor 22M, applies a positive rotation voltage to the drive motor 22M, and rotates the pump 22 forward. The positive rotation of the pump 22 means the rotation direction of the pump 22 for supplying the hot melt adhesive from the pump 22 toward the discharge roll 3, and the positive rotation voltage is for rotating the pump forward. Means voltage. The hot melt adhesive is sent out toward the discharge roll 3 by opening the valve 20V and rotating the pump 22 forward.

  The hot melt adhesive sent out by the pump 22 passes through the main pipe 33m formed in the discharge roll 3 from the supply pipe 21 through the shaft 33s on one side of the main body portion 33 connected to the supply pipe 21. Supplied. At this time, the production line of the absorbent article is stopped, and the belt-like sheet S is not conveyed toward the discharge roll 3, so that the hot-melt adhesive is not applied to the belt-like sheet S.

  Moreover, in the liquid coating apparatus 1, the pressure in the discharge roll 3 detected by the pressure sensor 8 starts to rise when the supply of the hot melt adhesive is started from the tank 20, as shown in FIG. The pressure in the discharge roll 3 circulates in the supply pipe 21 and each main pipe line 33m, and at a substantially constant inclination angle until the hot melt adhesive is filled from the supply pipe 21 to each branch pipe line 33d. It rises (see (A) of FIG. 6).

  Next, when the hot melt adhesive fills each branch pipe 33d that is the first flow path and passes through each branch pipe 33d, in the liquid coating apparatus 1, as shown in FIG. The hot melt adhesive flows into the diffusion portions 37 and 37 from the respective branch pipes 33d. When the hot melt adhesive flows into the diffusion portions 37, 37, the hot melt adhesive temporarily accumulates in each diffusion portion 37 and diffuses in each diffusion portion 37 along the outer surface of the main body portion 33. When the hot melt adhesive flows into the diffusing portions 37, 37, the pressure increase in the discharge roll 3 detected by the pressure sensor 8 stops (see FIG. 6A) and is detected by the pressure sensor 8. The pressure in the discharge roll 3 becomes substantially constant until the diffusion portions 37, 37 are filled (see FIG. 6B).

  Next, when the hot melt adhesive fills the diffusion portions 37, 37, the hot melt adhesive is in the second flow path having a smaller flow path (smaller volume) than each branch pipe 33d that is the first flow path. It flows into each introduction hole 35h. When the hot melt adhesive flows into each introduction hole 35h, in the liquid coating apparatus 1, the pressure inside the discharge roll 3 detected by the pressure sensor 8 starts to rise again at a constant inclination angle (FIG. 6). (See (C)). At this time, the rate of increase in pressure inside the discharge roll 3 (inclination angle shown in FIG. 6) indicates that in the liquid coating apparatus 1, the hot melt adhesive flows into the introduction holes 35h that are the second flow paths. The case (see FIG. 6C) is larger than the case where the hot melt adhesive flows into each branch pipe 33d as the first flow path (see FIG. 6A).

  Next, when the hot melt adhesive fills each introduction hole 35h and passes through each introduction hole 35h, the liquid coating apparatus 1 introduces each hot melt adhesive into each introduction hole as shown in FIG. It flows into the recesses 32, 32 from the hole 35h. When the hot melt adhesive flows into the recesses 32, 32, the hot melt adhesive temporarily accumulates in the recesses 32 and diffuses in the recesses 32 along the outer surface of the second auxiliary plate 35. Then, when the hot melt adhesive flows into the recesses 32, 32, the pressure inside the discharge roll 3 detected by the pressure sensor 8 stops increasing (see FIG. 6C), and the inside of the discharge roll 3 is stopped. The pressure is substantially constant until the inside of each recess 32 is filled with the hot melt adhesive (see FIG. 6D). In the liquid coating apparatus 1, the rate of increase in the pressure in the discharge roll 3 (see FIG. 6C) when the hot melt adhesive flows into each introduction hole 35h that is the second flow path is the first. Since the rate of increase in the pressure in the discharge roll 3 when the hot melt adhesive flows into each branch pipe 33d, which is a flow path (see FIG. 6A), the hot melt adhesive is recessed. It is easy for the pressure sensor 8 to detect that the pressure has flowed into 32 and 32 and the pressure has become substantially constant.

  As shown in FIG. 6, in the liquid coating apparatus 1, the control unit 9 is configured so that the hot melt adhesive supplied from the supply unit 2 through each branch pipe 33 d serving as the first flow path is the second flow path. When the pressure sensor 8 detects that the pressure rise when passing through each introduction hole 35h stops, the movement of the belt-like sheet S on the production line is started after a predetermined time.

When the hot melt adhesive flows into the recesses 32 and 32 and the pressure in the discharge roll 3 detected by the pressure sensor 8 stops increasing (see (D in FIG. 6) )), The time until each recess 32 is filled with the hot melt adhesive is calculated from the volume of each recess 32 and the flow rate of the hot melt adhesive flowing into each recess 32. Based on this, the movement of the belt-like sheet S on the production line is started. For example, when the volume of each recess 32 is 1000 mm ³ and the flow rate of the hot melt adhesive flowing into each recess 32 is 2 ml / min, the time until each recess 32 is filled with the hot melt adhesive is 0.00. 5 min. Therefore, in this case, the control unit 9 starts to move the belt-like sheet S on the production line after 0.5 min has elapsed.

  The predetermined time for starting the movement of the belt-like sheet S on the production line may be a time until each recess 32 is filled with the hot melt adhesive, or until each recess 32 is filled with the hot melt adhesive. It is good also as the time which added a fixed time (for example, 30 seconds) to the time of, and as the time which added the time which a hot melt adhesive permeate | transmits the surface plate 30 to the time when each recessed part 32 is filled with a hot melt adhesive. Also good. The control unit 9 stores in advance a predetermined time until each concave portion 32 is filled with the hot melt adhesive, and starts the movement of the belt-like sheet S on the production line based on the predetermined time stored in advance. May be.

  When the predetermined time has elapsed, the control unit 9 provided in the liquid coating apparatus 1 first drives the contact / separation mechanism 7 to nip the receiving roll 5 to the discharge roll 3. Then, the first drive source 4 is driven to rotate the discharge roll 3, and the second drive source 6 is driven to rotate the receiving roll 5. Thereby, the movement of the belt-like sheet S by the discharge roll 3 and the receiving roll 5 is started.

  Next, when the hot melt adhesive fills the recesses 32, 32, in the liquid coating apparatus 1, the hot melt adhesive starts to penetrate the porous body of the surface plate 30. When the hot melt adhesive starts to permeate through the porous body of the surface plate 30, the liquid coating apparatus 1 again starts increasing the pressure in the discharge roll 3 at a certain inclination angle ((E) in FIG. 6). reference). When the hot melt adhesive passes through the surface plate 30, the pressure in the discharge roll 3 stops increasing (see FIG. 6E), and the pressure in the discharge roll 3 becomes constant again (FIG. 6F). reference). When the hot melt adhesive passes through the surface plate 30, as shown in FIG. 3, the hot melt adhesive 11 discharged in a predetermined shape onto the belt-like sheet S moved by the discharge roll 3 and the receiving roll 5 is provided at predetermined intervals. It is applied sequentially.

  Thus, the rise in pressure when the hot melt adhesive supplied through the branch pipes 33d by the control unit 9 of the liquid coating apparatus 1 passes through the introduction holes 35h is stopped ((C in FIG. 6). ) And (D)), the pressure sensor 8 detects the timing at which the hot melt adhesive is discharged from the surface plate 30 by starting the movement of the belt-like sheet S on the production line after a predetermined time has elapsed. Thus, for example, it is possible to suppress the occurrence of coating failure at the time of startup or the like.

  Next, the recovery operation of the hot melt adhesive by the liquid coating apparatus 1 controlled by the control unit 9 when the production line is stopped will be described with reference to FIGS. 5 and 6 in addition to FIG. FIG. 5A is a schematic view showing a cross section of the exterior portion of the discharge roll 3 in a state before the hot melt adhesive is recovered from the recesses 32 and 32. FIG. 5B is a schematic view showing a cross section of the exterior portion of the discharge roll 3 in a state where the hot melt adhesive is recovered from the recesses 32 and 32.

  The control unit 9 included in the liquid coating apparatus 1 stops the movement of the belt-like sheet S on the production line when the production line stop signal is input. First, the control unit 9 separates the receiving roll 5 from the discharge roll 3 when the movement of the belt-like sheet S on the production line is stopped. In the liquid coating apparatus 1 shown in FIG. 1, the control unit 9 controls the pair of air cylinders 70, 70 constituting the contact / separation mechanism 7 when the production line stop signal is input, so that the receiving roll 5 is discharged to the discharge roll. Separated from 3. By separating the receiving roll 5 from the discharge roll 3, the nip state of the strip sheet S by the receiving roll 5 and the discharge roll 3 is released, and the strip sheet S is stopped.

  Moreover, the control part 9 with which the liquid coating apparatus 1 is provided discharges the strip | belt-shaped sheet S by driving the raising / lowering mechanism (not shown) which comprises a separation mechanism, when the movement of the strip | belt-shaped sheet S on a production line is stopped. Separated from the roll 3. In the liquid coating apparatus 1 shown in FIG. 1, the controller 9 controls a lifting mechanism (not shown) when a production line stop signal is input, nips the belt-like sheet S, and discharge rolls 3 and receiving rolls. A pair of side rolls (not shown) guided between the two are moved in a direction away from the discharge roll 3. The pair of side rolls (not shown) are preferably moved in the same direction as the receiving roll 5 is separated from the discharge roll 3. When the production line is stopped by controlling a lifting mechanism (not shown) and moving a pair of side rolls (not shown) away from the discharge roll 3, the discharge roll 3 and the belt-like sheet S Can be prevented, and the hot melt adhesive is prevented from being applied to the belt-like sheet S after the production line is stopped.

  Note that either the separation of the receiving roll 5 from the discharge roll 3 or the separation of the belt-like sheet S from the discharge roll 3 may be performed first, but in the liquid coating apparatus 1, it is preferable to perform these simultaneously. .

  Next, the control unit 9 included in the liquid coating apparatus 1 controls a drive source (not shown) connected to the drive motor 22M, applies a reverse rotation voltage to the drive motor 22M, and rotates the pump 22 in the reverse direction. When the control unit 9 rotates the pump 22 in the reverse direction, the supply of the hot melt adhesive from the pump 22 is stopped and the suction of the hot melt adhesive 3 inside the discharge roll 3 is started. When the hot melt adhesive inside the discharge roll 3 is sucked by the pump 22, in the liquid coating apparatus 1, the pressure inside the discharge roll 3 becomes negative (see (G) in FIG. 6).

  Here, the negative pressure means a pressure inside the discharge roll 3 (pressure on the suction side) generated when the hot melt adhesive is sucked by the pump 22, and the hot melt adhesive is supplied by the pump 22. This means a pressure opposite to the pressure (positive pressure) inside the discharge roll 3 generated when the discharge is performed. The reverse rotation of the pump 22 means the rotation direction of the pump 22 for sucking the hot melt adhesive from the inside of the discharge roll 3, and the reverse rotation voltage means the voltage for rotating the pump reversely. To do.

  When a negative pressure is generated inside the discharge roll 3, in the liquid coating apparatus 1, the inside of each main pipe line 33m, the inside of each branch pipe line 33d that is the first flow path, the inside of each diffusion part 37, the second flow The hot melt adhesive filling the inside of each introduction hole 35h and the inside of each recess 32, which is a path, and the hot melt adhesive passing through the porous body of the surface plate 30 are pulled back toward the pump 22, It is recovered by the pump 22.

  When the pump 22 rotates in the reverse direction, first, in the liquid coating apparatus 1, the hot melt adhesive that has permeated through the porous body of the surface plate 30 that is the outermost layer starts to be pulled out from the porous body. The hot-melt adhesive that has been pulled out from the porous body of the surface plate 30 is collected by the pump 22 through each recess 32, each introduction hole 35h, each diffusion portion 37, each branch pipe 33d, and each main pipe 33m. The Further, the pressure inside the discharge roll 3 detected by the pressure sensor 8 decreases at a substantially constant inclination angle until the hot melt adhesive is pulled out from the porous body of the surface plate 30 ((G) in FIG. 6). reference).

  Next, when the hot melt adhesive permeating through the porous body of the surface plate 30 has been pulled out from the porous body, the liquid coating apparatus 1 is shown in FIGS. 5 (a) and 5 (b). As described above, the hot melt adhesive filling the inside of each recess 32 starts to be pulled out from the inside of each recess 32. The hot melt adhesive that has been pulled out from the inside of each recess 32 is recovered by the pump 22 through each introduction hole 35h, each diffusion portion 37, each branch pipe 33d, and each main pipe 33m. The pressure inside the discharge roll 3 detected by the pressure sensor 8 stops when the hot melt adhesive is completely pulled out from the porous body of the surface plate 30 (see FIG. 6G). It becomes substantially constant until the hot melt adhesive filling the inside of the recess 32 is pulled out (see (H) in FIG. 6).

  Next, when the hot melt adhesive filling the inside of each recess 32 is completely pulled out from each of the recesses 32, the liquid coating apparatus 1 uses the hot melt adhesive filling the inside of each introduction hole 35h. Extraction from the inside of each introduction hole 35h is started. The hot melt adhesive that has been pulled out from the inside of each introduction hole 35h is collected by the pump 22 through each diffusion portion 37, each branch pipe 33d, and each main pipe 33m. Further, the pressure inside the discharge roll 3 detected by the pressure sensor 8 is set at a constant inclination angle by starting the extraction of the hot melt adhesive filling the inside of each introduction hole 35h from each introduction hole 35h. The ascent starts (see (I) of FIG. 6).

  Next, when the hot melt adhesive is pulled out from each introduction hole 35 h, the liquid coating apparatus 1 pulls out the hot melt adhesive filling the inside of each diffusion portion 37 from the inside of each diffusion portion 37. Is started. The hot melt adhesive withdrawn from the inside of each diffusion portion 37 is collected by the pump 22 through each branch line 33d and each main line 33m. Further, the pressure inside the discharge roll 3 detected by the pressure sensor 8 becomes substantially constant until the hot melt adhesive that fills the inside of each diffusing portion 37 is pulled out (see FIG. 6J).

  As shown in FIG. 6, in the liquid coating apparatus 1, the control unit 9 causes the supply unit 2 to supply the inside of the discharge roll 3 when the movement of the belt-like sheet S on which the hot melt adhesive is discharged is stopped. The pressure sensor 8 collects the hot melt adhesive through the introduction holes 35h and the branch pipes 33d, and stops the increase in pressure when the hot melt adhesive in the recesses 32 and 32 passes through the introduction holes 35h. When detected, recovery of the liquid in the discharge roll 3 by the supply unit 2 is stopped.

  In the liquid coating apparatus 1, the controller 9 extracts the hot melt adhesive filling the inside of each introduction hole 35 h from the inside of each introduction hole 35 h and detects the inside of the discharge roll 3 detected by the pressure sensor 8. When the increase in pressure stops (see (I) and (J) in FIG. 6), a drive source (not shown) connected to the drive motor 22M is controlled to stop the application of voltage to the drive motor 22M. The reverse rotation of the pump 22 is stopped. Then, by stopping the reverse rotation of the pump 22, the suction of the hot melt adhesive 3 inside the discharge roll 3 is stopped.

  As described above, after the pressure sensor 8 detects that the pressure inside the discharge roll 3 stops when the hot melt adhesive filling the inside of each introduction hole 35h is pulled out from the inside of each introduction hole 35h. By stopping the reverse rotation of the pump 22 and stopping the recovery of the hot melt adhesive, it is possible to prevent the hot melt adhesive filled in the respective recesses 32 from oozing out from the surface plate 30 over time. it can.

  The control unit 9 indicates that the pressure sensor 8 indicates that the hot melt adhesive filling the inside of each diffusion unit 37 is pulled out from the inside of each introduction hole 35h and the pressure inside the discharge roll 3 stops increasing. It is preferable to stop the rotation of the pump 22 after a certain time has elapsed after detection (for example, after 30 seconds). After a certain time has elapsed (for example, after 30 seconds), by stopping the rotation of the pump 22, the hot melt adhesive filling the inside of each introduction hole 35h is reliably pulled out from the inside of each introduction hole 35h. After that, the pump 22 can be stopped.

  Further, in the liquid coating apparatus 1, the control unit 9 rotates at a rotation speed that prevents the hot melt adhesive from leaking out from the surface plate 30 while the supply unit 2 collects the hot melt adhesive in the discharge roll 3. The discharge roll 3 is rotated. In the liquid coating apparatus 1, the control unit 9 controls the first drive source 4 shown in FIG. 1 to set the number of rotations of the discharge roll 3 so that the hot melt adhesive does not leak from the surface plate 30. Rotate with.

  The rotation speed of the discharge roll 3 to such an extent that the hot melt adhesive does not leak from the surface plate 30 is preferably 5 rpm or more, more preferably 10 rpm or more, preferably 60 rpm or less, more preferably 30 rpm or less, preferably 5 rpm or more and 60 rpm. Hereinafter, it is more preferably 10 rpm or more and 30 rpm or less.

  In this way, while the supply unit 2 collects the hot melt adhesive in the discharge roll 3, the discharge roll 3 is rotated at a rotation speed that does not allow the hot melt adhesive to leak from the surface plate 30. Thus, it is possible to prevent the hot melt adhesive from oozing out from the surface plate 30 due to the influence of gravity or the like during the recovery of the hot melt adhesive.

  Next, when the reverse rotation of the pump 22 is stopped and the recovery of the hot melt adhesive is completed, in the liquid coating apparatus 1, the control unit 9 controls the valve 20V of the tank 20 to close the valve 20V. Further, in the liquid coating apparatus 1, the control unit 9 controls the first drive source 4 shown in FIG. 1 to stop the rotation of the discharge roll 3, and controls the second drive source 6 shown in FIG. The rotation of the receiving roll 5 is stopped.

  As described above, according to the liquid coating apparatus 1 of the present embodiment, the hot melt adhesive is diffused in the recesses 32, 32 formed on the outer peripheral surface of the discharge roll 3, and the hot melt adhesive is applied to the surface. Even when the sheet 30 is discharged from the plate 30 and applied to the belt-like sheet S, the pressure rise when the hot melt adhesive passes through the introduction hole 35h having a narrower flow path than the branch pipe 33d inside the discharge roll 3. (See (C) and (D) of FIG. 6) is detected by the pressure sensor 8 so that the hot melt adhesive filled in the recesses 32 and 32 is easily discharged from the surface plate 30. It can be detected. Therefore, for example, by starting the movement of the belt-like sheet after a predetermined time has elapsed since the pressure increase was detected, it is possible to suppress the occurrence of defective application of the hot melt adhesive to the belt-like sheet.

  In addition, when the movement of the belt-like sheet is stopped, after the hot melt adhesive filled in the recesses 32 and 32 is pulled out, the pressure increase due to the hot melt adhesive being pulled out from the inside of each introduction hole 35h is stopped. Until the pressure sensor 8 detects this, the pump 22 is rotated in the reverse direction to recover the hot melt adhesive. Thus, since hot melt is collect | recovered, it can suppress that the hot melt adhesive with which the recessed parts 32 and 32 were filled oozes out of the surface plate 30 with progress of time, for example. Therefore, for example, it is possible to prevent the belt-like sheet, the liquid coating apparatus 1 and the like from being soiled.

  Further, while the supply unit 2 collects the hot melt adhesive in the discharge roll 3, the hot melt adhesion is performed by rotating the discharge roll 3 at a low speed so that the hot melt adhesive does not leak from the surface plate 30. It is possible to suppress the hot melt adhesive from oozing out from the surface plate 30 due to the influence of gravity or the like during the recovery of the agent.

  Next, another embodiment of the discharge section of the liquid coating apparatus of the present invention will be described with reference to FIGS. 7 (a) and 7 (b). Fig.7 (a) is the schematic diagram which showed the cross section of the front side of the die-coater 100 which is other embodiment of the discharge part of the liquid coating apparatus of this invention, FIG.7 (b) is FIG.7 (a). It is the schematic diagram which showed the cross section of the side surface side of the die-coater 100 shown in FIG.

  In the liquid coating apparatus 1 described above, the discharge roll 3 is used as the discharge section. However, the discharge section of the liquid coating apparatus of the present invention discharges liquid in a predetermined shape from the tip, and the tip is coated. It can also be suitably used for the die coater 100 that applies a liquid to an object to be coated by being relatively moved while being in contact with the work. Hereinafter, the die coater 100 used as the discharge unit will be described with reference to the drawings.

  As shown in FIGS. 7A and 7B, the die coater 100 includes a die coater main body 300 that is a discharge portion main body that diffuses the liquid supplied from the supply portion in a recess 321 formed on the outer surface, and the die coater main body. 300, the porous body 301 that covers the entire area of the concave portion 321 and allows the liquid diffused in the concave portion 321 to pass therethrough. The die coater main body 300 having a concave portion 321 formed on the outer surface connects the first flow path 331 through which the liquid supplied from the supply section circulates, and the first flow path 331 and the concave section 321. A second flow path 351 having a narrower flow path than the flow path 331. Note that the shape of the concave portion 321 of the die coater 100 is not a shape corresponding to a predetermined shape of the hot melt adhesive 11 to be discharged.

  As described above, even when the die coater 100 is used, as shown in FIGS. 7A and 7B, the liquid supplied through the first flow path 331 is narrower than the first flow path 331. By making the pressure sensor detect that the pressure rise when passing through the second flow path 351 stops, for example, the timing at which the liquid is discharged from the porous body 301 can be easily understood. For this reason, the occurrence of a coating failure or the like at the time of start-up can be suppressed by moving the object to be coated on the production line after a predetermined time has elapsed since the pressure increase was detected.

  Even when the die coater 100 is used, the liquid in the die coater 100 is collected through the second flow path 351 and the first flow path 331 when the movement of the object to be coated on the production line is stopped. When the pressure sensor detects that the pressure in the concave portion 321 stops increasing when the liquid passes through the second flow path 351, the recovery of the liquid in the die coater 100 by the supply unit is stopped. Liquid leakage from the porous body 301 can be suppressed.

  As mentioned above, although this invention was demonstrated based on the preferable 1st Embodiment, this invention is not limited to the above-mentioned embodiment.

  For example, in the liquid coating apparatus 1, the entire outer peripheral surface of the roll body 31 is covered with the surface plate 30 formed of a porous material, but in the present invention, the recess 32 formed on the outer peripheral surface of the roll body 31. , 32 alone may be made of a porous material.

  Further, in the liquid coating apparatus 1, the entire outer peripheral surface of the roll main body 31 is covered with the surface plate 30. However, in the present invention, for example, the surface plate is formed in the same shape as the concave portions 32 and 32 having a predetermined shape. The concave portions 32 and 32 may be covered by fitting the surface plate into the shaped concave portions 32 and 32, and a part of the outer peripheral surface of the discharge roll may be covered.

  Moreover, in the liquid coating apparatus 1, although the roll main body 31 which formed the two recessed parts 32 and 32 in the outer peripheral surface was used, the number of the recessed parts of a roll main body is not limited to this. The roll body may have one concave portion or two or more concave portions.

  Moreover, in the liquid coating apparatus 1, although demonstrated using a pair of main pipe lines 33m and 33m, the number of main pipe lines is not limited to this. Similarly, although the liquid coating apparatus 1 has been described using a plurality of branch pipes 33d, the number of branch pipes is not limited thereto.

  Moreover, in the liquid coating apparatus 1, although the diffusion part 37 was provided between each branch pipe line 33d which is a 1st flow path, and each introduction hole 35h which is a 2nd flow path, the liquid coating apparatus of this invention In this case, the first channel and the second channel narrower than the first channel may be directly connected. That is, the second channel may directly connect the first channel and the recess.

DESCRIPTION OF SYMBOLS 1 Liquid coating apparatus 2 Supply part 20 Tank 22 Pump 3 Discharge roll (discharge part)
30 Surface plate (porous material)
31 Roll body (discharge unit body)
32 Concave part 33 Body part 33m Main pipe line 33d Branch pipe line (first flow path)
34 first auxiliary plate 35a opening 35 second auxiliary plate 35h introduction hole (second flow path)
36 pattern shape plate 36a opening 37 diffusion part 5 receiving roll 7 contact / separation mechanism 70 pair of air cylinders 8 pressure sensor 9 control part S belt-like sheet (object to be coated)

Claims (7)

A liquid coating apparatus that discharges liquid supplied from a supply unit into a predetermined shape and coats an object to be coated moving on a production line,
A discharge body that has a recess formed in the outer surface and diffuses the liquid supplied from the supply section in the recess, and covers the recess of the discharge section main body over the entire area, and transmits the liquid diffused in the recess. A discharge part having a porous body to be made,
A pressure sensor for detecting a pressure when the liquid flows in the discharge section;
Based on the pressure in the discharge part detected by the pressure sensor, the control unit moves the object to be coated on the production line toward the discharge part and applies a liquid to the object to be coated. Prepared,
The discharge section main body has a first flow path through which the liquid supplied from the supply section circulates, a second flow path that is narrower than the first flow path by connecting the first flow path and the recess. A flow path,
When the pressure sensor detects that the pressure supplied when the liquid supplied from the supply unit through the first flow channel passes through the second flow channel stops, the control unit performs the manufacturing after a predetermined time has elapsed. A liquid coating apparatus for starting movement of the object to be coated on a line. A liquid coating apparatus that discharges liquid supplied from a supply unit into a predetermined shape and coats an object to be coated moving on a production line,
A concave portion is formed on the outer surface, and the discharge portion main body that diffuses the liquid supplied from the supply portion in the concave portion, covers the concave portion of the discharge portion main body over the entire area, and the liquid diffused in the concave portion A discharge part having a porous body to be transmitted; and
A pressure sensor for detecting a pressure when the liquid flows in the discharge section;
Based on the pressure in the discharge unit detected by the pressure sensor, a control unit for controlling the movement of the workpiece on the production line and the operation of the supply unit,
The discharge section main body has a first flow path through which the liquid supplied from the supply section circulates, a second flow path that is narrower than the first flow path by connecting the first flow path and the recess. A flow path,
The supply unit is capable of supplying a liquid and collecting the supplied liquid,
When the control unit stops the movement of the object on which the liquid on the production line is discharged, the liquid in the discharge unit is supplied to the supply unit through the second flow path and the first flow path. When the pressure sensor detects that the pressure in the concave portion has stopped increasing when the liquid passes through the second flow path, the liquid application stops the recovery of the liquid in the discharge portion by the supply portion. Engineering equipment. The discharge part is a discharge roll;
The liquid coating according to claim 2, wherein the control unit rotates the discharge roll at a rotation speed that prevents the liquid from leaking from the porous body while the supply unit collects the liquid in the discharge unit. apparatus. The discharge part is a discharge roll;
The concave portion of the discharge unit main body is formed in a pattern corresponding to a predetermined shape for discharging liquid,
The liquid coating apparatus according to claim 1, comprising the discharge roll and a receiving roll disposed to face the discharge roll.   The liquid coating apparatus according to claim 4, wherein when the movement of the object to be coated on the production line is stopped by the control unit, the receiving roll is separated from the discharge roll. A separation mechanism for separating the object to be coated from the discharge unit;
The said control part drives the said separation mechanism, and when the movement of the said to-be-coated object on the said production line is stopped, the said to-be-coated object is spaced apart from the said discharge part. The liquid coating apparatus according to any one of the above. Having a diffusion part between the first channel and the second channel;
The liquid coating apparatus according to claim 1, wherein a volume of the concave portion is larger than a volume of the diffusion portion.

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