JP6764766B2 - Liquid coating equipment - Google Patents

Description

The present invention relates to a liquid coating device.

Conventionally, as a liquid coating device that applies a liquid such as an adhesive to a moving object to be coated in a predetermined pattern, a surface plate that forms an outer peripheral surface and a roll body that constitutes a portion inside the surface plate. A liquid having a discharge roll, wherein the liquid supplied through the inside of the roll body is temporarily stored in a recess formed on the outer peripheral surface of the roll body and then discharged from a surface plate covering the recess. Coating equipment is known.

When the applicant first applies a liquid such as an adhesive to the object to be coated with a predetermined coating pattern, the liquid can be applied evenly to the entire area to be coated. A liquid coating device was proposed (see Patent Document 1).

Patent No. 5324154

By the way, the conventional liquid coating apparatus as described above is provided with a flow path hole for allowing liquid to flow into a recess formed on the outer peripheral surface from the inside of the roll body, and the roll is provided as such a flow path hole. A main pipeline formed in the direction of the rotation axis and a branch pipeline formed radially from the main pipeline to the recess are arranged in the axial core portion of the main body.
If the diameter of the main pipeline and the branch pipeline is large, it takes time for the liquid to be filled inside, and it takes time for the inside of the roll body to be filled with the liquid. Therefore, it takes time to start coating the liquid with the discharge roll. Further, if the diameters of the main pipeline and the branch pipeline are large, the amount of liquid filled therein becomes relatively large with respect to the discharge amount discharged by the discharge roll, which may cause variations in the discharge amount. Even after the supply is stopped, the liquid remaining inside the supply may leak due to centrifugal force or the like. On the other hand, since the main pipeline and the branch pipeline are generally formed by drilling with a drill, there is a limit to reducing the diameter of the hole. As described above, the conventional liquid coating apparatus has room for further improvement.

Therefore, an object of the present invention is to provide a liquid coating apparatus capable of eliminating the above-mentioned drawbacks of the prior art.

The present invention includes a discharge roll that allows the liquid supplied from the supply unit to pass through the surface plate and discharges the liquid in a predetermined shape, and applies the liquid discharged from the discharge roll to the moving object to be coated. In the device, the surface plate constitutes the outer peripheral surface of the discharge roll, and the outer peripheral surface of the roll body forming the inner portion of the discharge roll from the surface plate has a pattern corresponding to the predetermined shape. A recess is formed, and inside the roll body, a main pipeline extending in the rotation axis direction of the roll body and an introduction hole provided at the bottom of the recess from the main pipeline are formed. A branch pipeline is formed, and the discharge roll is provided at one end of the main pipeline and connected to the supply unit, and at the bottom of the recess in the branch pipeline. A detachable portion that is detachably connected to the introduction hole and a tube that is arranged inside the main pipeline to the branch pipeline are provided, and one end of the tube is connected to the connection portion. Provided is a liquid coating apparatus in which the other end portion is connected to the detachable portion.

According to the liquid coating apparatus of the present invention, the time until the start of liquid discharge by the discharge roll is shortened, the variation in the discharge amount of the liquid discharged by the discharge roll is suppressed, and the discharge roll after the liquid supply is stopped is started. Liquid leakage can be suppressed.

FIG. 1 is a schematic view showing a cross section of a discharge roll of a liquid coating device according to an embodiment of the present invention. FIG. 2A is a cross-sectional view of a discharge roll of the liquid coating apparatus according to the embodiment of the present invention, and FIG. 2B is a partially enlarged portion of a discharge roll attachment / detachment portion shown in FIG. 2A. It is a sectional view. FIG. 3 is a cross-sectional view of the rotary joint of the discharge roll shown in FIG. 2 (a).

Hereinafter, the liquid coating apparatus of the present invention will be described based on the preferred embodiment thereof with reference to the drawings. As shown in FIGS. 1 and 2A, the liquid coating apparatus 1 according to the embodiment of the present invention allows the liquid supplied from the supply unit 2 to pass through the surface plate 30 and discharge the liquid in a predetermined shape. A coating device including a roll 3 for applying a liquid discharged from a discharge roll 3 to a moving object to be coated. The surface plate 30 constitutes the outer peripheral surface of the discharge roll 3, and the outer peripheral surface of the roll body 31 constituting the portion inside the surface plate 30 of the discharge roll 3 corresponds to the predetermined shape of the discharged liquid. The recess 32 of the pattern is formed. Here, the "pattern corresponding to the predetermined shape" means that the contour of the concave portion 32 when the concave portion 32 is viewed from the normal direction matches the shape of the liquid to be applied to the object to be coated. Means.

As the liquid discharged from the discharge roll 3, for example, a viscous liquid such as a hot melt adhesive, an oil agent, a skin care agent, or a functional agent having a moisturizing effect can be used. The hot melt adhesive is not particularly limited, but is, for example, styrene rubber such as styrene / butadiene / styrene block copolymer (SBS), styrene / ethylene / butylene / styrene block copolymer (SEBS), or amorphous poly. Examples thereof include hot melt adhesives such as olefin polymers such as α-olefin (APAO) and ethylene vinyl acetate copolymer (EVA). Adhesives other than hot melt adhesives, such as low density polyethylene, polyvinyl acetate, silicone resin, and glue, can also be used. The viscosity of the viscous liquid 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, and more preferably 10 CPS or more and 8000 CPS or less.

The object to be coated with the liquid is, for example, a sheet-like material made of a non-woven fabric, a woven fabric, a resin film, a knitting material, or a laminated body in which these sheet-like materials are laminated in two or more layers. Examples thereof include articles obtained by laminating or sandwiching other members on these sheet-like objects or laminated bodies. The object to be coated may be a continuous strip-shaped body, or may have a predetermined length and may be sequentially conveyed at a predetermined interval.

In the following, a liquid coating apparatus 1 using a hot melt adhesive as the liquid and a strip-shaped sheet as the object to be coated will be described as an example.

As shown in FIG. 1, the liquid coating apparatus 1 includes a supply unit 2 for supplying a hot melt adhesive and a discharge roll 3 for discharging the hot melt adhesive in a predetermined shape. In addition to these, the first drive source 4 that rotates the discharge roll 3, the receiving roll 5 that nips and conveys the continuously conveyed strip-shaped sheet with the discharge roll 3, and the receiving roll 5 are rotated. It is provided with a second drive source 6 for causing the discharge roll 3, a contact / detachment mechanism 7 for bringing the receiving roll 5 into contact with the discharge roll 3, and a control unit 8 for controlling these.

As shown in FIG. 1, the supply unit 2 connects the tank 20 containing the hot melt adhesive, the supply pipe 21 connecting the tank 20 and the discharge roll 3, and the supply pipe 21 in the liquid coating apparatus 1. A pump 22 for sending the hot melt adhesive contained in the tank 20 to the discharge roll 3 via the tank 20 is provided. A heating means (not shown) such as a heater is incorporated in the tank 20, and the temperature inside the tank 20 can be controlled by the heating means such as a heater. Further, the tank 20 is connected to the supply pipe 21 via the first valve 20V. The first valve 20V is electrically connected to the control unit 8, and the opening / closing is controlled by the control unit 8. One end of the supply pipe 21 is connected to the first valve 20V of the tank 20, and the other end is connected to a connection portion (rotary joint) 36 of the discharge roll 3, which will be described later. A second valve 21V is connected to the supply pipe 21. The second valve 21V is electrically connected to the control unit 8, and the opening / closing is controlled by the control unit 8. The pump 22 is connected to the supply pipe 21 on the downstream side of the first valve 20V. Further, the pump 22 has a drive motor 22M capable of forward / reverse rotation, and by rotating the drive motor 22M in the forward direction, the hot melt adhesive is sent out to the discharge roll 3 via the supply pipe 21 to drive the drive. By rotating the motor 22M in the reverse direction, the hot melt adhesive remaining in the discharge roll 3 can be sucked and recovered through the supply pipe 21. The pump 22 is electrically connected to the control unit 8, and the rotation of the drive motor 22M is controlled by the control unit 8. For example, the drive motor 22M rotates in the forward direction when a forward rotation voltage is applied by the control unit 8, and rotates in the reverse direction when a reverse rotation voltage is applied.

As shown in FIGS. 1 and 2A, in the liquid coating device 1, the discharge roll 3 is formed on the outer peripheral surface of the discharge roll 3 and inside the surface plate 30 of the discharge roll 3. It includes a roll body 31 that constitutes a portion (on the shaft core portion side). A recess 32 is provided on the outer peripheral surface of the roll body 31. In the liquid coating apparatus 1, a plurality of (two) recesses 32, 32 are provided on the outer peripheral surface of the roll main body 31 at predetermined intervals in the circumferential direction. Inside the roll body 31, there is a main pipeline 33 m extending in the rotation axis direction X of the roll body 31 at its axial center, and an introduction hole 34h provided in the bottoms 32b, 32b of the recesses 32, 32 from the main pipeline 33 m. , A branch pipeline 33d extending over 34h is formed.
Further, the discharge roll 3 has a connection portion 36 arranged at one end of the main pipeline 33m and connected to the supply portion 2, and an introduction hole 34h provided in the bottom portions 32b and 32b of the recesses 32 and 32 in the branch pipeline 33d. It includes a detachable portion 37 that is detachably connected to 34h, and tubes 38 and 38 that are arranged inside the main pipeline 33m to the branch pipeline 33d.

As shown in FIG. 2A, the surface plate 30 is detachably attached to 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 in the liquid coating device 1. .. Further, the surface plate 30 is composed of a porous material having a large number of micropores penetrating in the thickness direction, and a liquid to be coated (a hot melt adhesive in the liquid coating apparatus 1) forms these micropores. It is transparent through. As the porous material constituting the surface plate 30, wire mesh, punching metal, etching pore material, sintered metal, ceramics, a laminate thereof and the like can be used.

The average pore diameter of the micropores of the porous material constituting the surface plate 30 is preferably 0.01 mm or more and 2 mm or less, particularly 0.03 mm or more and 0.8 mm or less. The opening area ratio of the fine pores of the porous material is preferably 1% or more and 80% or less, particularly 5% or more and 60% or less. The area of the individual micropores of the porous material is preferably 0.002 mm ² or more and 3.2 mm ² or less, particularly 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, respectively.
For the average pore diameter of the micropores, observe the surface plate 30 from directly above with an optical microscope, measure the area of the opening on the surface at least 10 points, and S (area of the pores) = PAI / 4 × d ² (PAI =). Let d, which is calculated back in 3.14), be the equivalent circle diameter, and use the average value of these. The area of the micropores 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. 2A, the roll main body 31 is arranged on the main body portion 33 including the shaft core portion and the outer peripheral surface of the main body portion 33 and the detachable portion 37 is arranged in the liquid coating device 1. It has an auxiliary plate 34 and a pattern-shaped plate 35 arranged on the outer peripheral surface of the auxiliary plate 34 and having an opening 35a of a pattern corresponding to a predetermined shape. In the liquid coating device 1, the recesses 32 and 32 of the roll body 31 are formed by an inner portion 35r of the opening 35a of the pattern-shaped plate 35 and an outer surface 34u of the auxiliary plate 34. The auxiliary plate 34 and the pattern shape plate 35 may be formed by one component.

As shown in FIG. 1, the main body portion 33 is formed in a substantially cylindrical shape in the liquid coating apparatus 1, and the shaft portions 33s and 33s provided at both ends in the rotation axis direction X are attached to the frames 10 and 10. It is rotatably supported. Inside the main body portion 33, there are a main pipeline 33 m extending in the rotation axis direction X to the shaft core portion, and a branch pipeline 33 d extending in the radial direction from the main pipeline 33 m toward the outer peripheral surface of the main body portion 33. Is formed. In the liquid coating apparatus 1, a plurality of (two) branch pipelines 33d and 33d are formed. Further, a heating means (not shown) such as a cartridge heater is incorporated inside the main body portion 33, and the temperature inside the main body portion 33 can be adjusted by the heating means such as a cartridge heater. By adjusting the temperature inside the main body portion 33, for example, the viscosity of the hot melt adhesive circulating inside the main body portion 33 can be adjusted so as to easily flow.

The main pipeline 33m is formed by drilling a hole in the liquid coating apparatus 1, and is in the rotation axis direction from one side shaft portion 33s of the rotation axis direction X of the main body portion 33 toward the other side shaft portion 33s. It is formed so as to extend to X. In the liquid coating apparatus 1, the main pipeline 33m is formed from the shaft portion 33s on one side to a substantially central portion in the rotation axis direction X. That is, the main pipeline 33m has a hole shape that extends from the shaft portion 33s on one side to the substantially central portion in the rotation axis direction X. The outer diameter of the main pipeline 33 m is not particularly limited as long as the tubes 38 and 38 can be arranged, but from the viewpoint of being formed by drilling, the liquid coating device 1 has a diameter of 6 mm or more. It is preferably formed to have a diameter of 25 mm or less.

The branch pipes 33d and 33d are formed by drilling holes in the liquid coating device 1, and are formed from the main pipe 33m to the outer peripheral surface of the main body portion 33. That is, the branch pipelines 33d and 33d are formed by communicating the main pipeline 33m and the outer peripheral surface of the main body portion 33. The outer diameters of the branch pipes 33d and 33d are not particularly limited as long as the tubes 38 and 38 can be arranged, but from the viewpoint of being formed by drilling with a drill, the liquid coating device 1 , It is preferable that the shape is φ6 mm or more and φ25 mm or less.

The auxiliary plate 34 is formed so that the liquid coating device 1 can cover the entire outer peripheral surface of the main body portion 33 (the entire outer peripheral surface of the main body portion 33 excluding the shaft portions 33s and 33s). The auxiliary plate 34 is fixed to the main body portion 33 by a fixture (not shown) in a state of covering the entire outer peripheral surface of the main body portion 33. Further, the auxiliary plate 34 is formed with introduction holes 34h and 34h penetrating in the thickness direction of the auxiliary plate 34. The introduction holes 34h and 34h are formed at positions communicating with the branch pipelines 33d and 33d when the auxiliary plate 34 is fixed to the outer peripheral surface of the main body portion 33. The inner diameters of the introduction holes 34h and 34h are smaller than the inner diameter of the branch pipe 33d, and the ratio of the inner diameter of the introduction hole 34h to the inner diameter of the branch pipe 33d ((inner diameter of the introduction hole 34h / inner diameter of the branch pipe 33d) × 100). It is preferably 0.4% or more, more preferably 1% or more, preferably 75% or less, more preferably 60% or less, preferably 0.4% or more and 75% or less, and more preferably 1% or more and 60%. It is as follows.

In the liquid coating apparatus 1, the pattern shape plate 35 is formed so as to be able to cover the entire outer peripheral surface of the auxiliary plate 34 that covers the outer peripheral surface of the main body portion 33. The pattern shape plate 35 is fixed to the auxiliary plate 34 by a fixture (not shown) with the outer peripheral surface of the auxiliary plate 34 covered. Further, the pattern shape plate 35 is formed with openings 35a, 35a of a pattern corresponding to a predetermined shape penetrating in the thickness direction of the pattern shape plate 35. The openings 35a and 35a are formed at positions communicating with the introduction holes 34h and 34h formed in the auxiliary plate 34 when the pattern-shaped plate 35 is fixed to the outer peripheral surface of the auxiliary plate 34.

As described above, in the liquid coating apparatus 1, the auxiliary plate 34 is laminated and arranged on the main body portion 33, and the pattern shape plate 35 is laminated and arranged on the auxiliary plate 34, and the branch pipeline 33d and the auxiliary plate 34 of the main body portion 33 are laminated. The introduction hole 34h and the opening 35a of the pattern-shaped plate 35 are formed so as to communicate with each other from the main pipeline 33m formed inside the main body portion 33 to the outer peripheral surface of the roll main body 31. Then, the outer surface 34u of the auxiliary plate 34 laminated and arranged on the main body portion 33 and the inner portions 35r and 35r of the openings 35a and 35a of the pattern-shaped plate 35 laminated and arranged on the auxiliary plate 34 form the roll main body 31. The recesses 32 and 32 are formed.

The thickness of the pattern shape plate 35 is preferably 0.1 mm or more and 5.0 mm or less, and more preferably 0.5 mm or more and 1.0 mm or less because the thickness is the depth of the recesses 32 and 32 of the roll body 31.
Further, the thickness of the surface plate 30 is preferably 0.05 times or more and 20 times or less with respect to the depths of the recesses 32 and 32 of the roll body 31 from the viewpoint of evenly coating the entire area to be coated. , 0.1 times or more and 2 times or less is more preferable. From the same viewpoint, the thickness of the surface plate 30 is preferably 20 mm or less, more preferably 10 mm or less, and even more preferably 0.05 mm or more and 2.0 mm or less.

The outer surface 34u of the auxiliary plate 34 and the inner portions 35r and 35r of the openings 35a and 35a of the pattern-shaped plates 35 laminated and arranged on the auxiliary plate 34 form the recesses 32 and 32 of the roll body 31 to form the recesses 32 and 32. The 32 and 32 can be easily disassembled, and the recesses 32 and 32 can be easily maintained.

In the liquid coating device 1, the connecting portion 36 arranged at one end of the main pipeline 33m and connected to the supply portion 2 can rotate the roll main body 31 and the supply pipe 21 of the supply unit 2 as shown in FIG. It consists of a rotary joint that connects to. The rotary joint 36 includes a shaft 36S to which one end of the tube 38 is connected, and a housing 36H to which the other end of the supply pipe 21 of the supply unit 2 is connected. The shaft 36S is rotatably supported by a ball bearing 36b arranged in the housing 36H while being airtight by a sealing member 36a arranged in the housing 36H. By connecting the roll body 31 and the supply pipe 21 of the supply unit 2 using the rotary joint 36, the roll body 31 and the supply pipe 21 of the supply unit 2 can be easily and rotatably connected.

The attachment / detachment portions 37, 37, which are detachably connected to the introduction holes 34h, 34h provided in the bottom portions 32b, 32b of the recesses 32, 32 in the branch pipeline 33d, are attached to the auxiliary plate 34 from the inner surface 34d side of the auxiliary plate 34. It is detachably connected to the introduction holes 34h and 34h of.
In the liquid coating device 1, each attachment / detachment portion 37 has a joint 37a for connecting the other end of each tube 38, as shown in FIG. 2B. By providing a joint in each attachment / detachment portion 37, each attachment / detachment portion 37 and the other end portion of each tube 38 can be easily connected.
Further, each detachable portion 37 has a flow rate adjusting mechanism 37b for adjusting the flow rate of the liquid flowing into the bottom portion 32b of each recess 32 via each tube 38 in the liquid coating device 1. In the liquid coating device 1, the flow rate adjusting mechanism 37b has an adjusting portion main body 37c in which an inflow hole 37h into which the hot melt adhesive flows from the tube 38 through the joint 37a is formed, and an inflow hole 37h of the adjusting portion main body 37c. Inside, there is a regulation screw 37d that projects in a direction orthogonal to the inflow direction of the hot melt adhesive to regulate the inflow amount of the hot melt adhesive. The adjusting portion main body 37c is attached to the inner surface 34d of the auxiliary plate 34 so that the inflow hole 37h overlaps the introduction hole 34h of the auxiliary plate 34 in the inflow direction. The regulating screw 37d is screwed into the adjusting portion main body 37c in a direction orthogonal to the inflow direction of the inflow hole 37h. By providing the flow rate adjusting mechanism 37b on the attachment / detachment portions 37, 37, it is possible to finely control the inflow amount of the hot melt adhesive flowing in through the tubes 38, 38.

The tubes 38, 38 are arranged inside the main pipe line 33 m to the branch line line 33d, one end of which is connected to the shaft 36S of the rotary joint 36, and the other end of which is connected to the joint 37a of the detachable part 37. Has been done. In this way, the tubes 38 and 38 are continuously arranged inside the main pipe line 33m to the branch pipe line 33d. Further, the tubes 38 and 38 are formed of a metal tube in the liquid coating apparatus 1, and especially when applying a hot melt adhesive, those using the metal tube from the viewpoint of heating and heat resistance. Is preferable. The tube 38 may be formed of a soft material so that it can move flexibly inside the main line 33m and the branch line 33d. Further, the tubes 38 and 38 are each formed to have the same thickness, and the inner diameter thereof is uniform. The inner diameters of the tubes 38 and 38 are smaller (thinner) than the inner diameters of the main pipeline 33 m and the branch pipeline. Further, the tubes 38 and 38 are arranged in the same number as the recesses 32 and 32. In the present embodiment, since the roll main body 31 is provided with the two recesses 32, 32, the two tubes 38, 38 are arranged.

The ratio of the inner diameter of the tube 38 to the inner diameter of the main pipeline 33 m ((ratio of the inner diameter of the tube 38 / inner diameter of the main pipeline 33 m) × 100) is preferably 1% or more, more preferably 5% or more, preferably 70%. Below, it is more preferably 10% or less, preferably 1% or more and 70% or less, and more preferably 5% or more and 10% or less.

The ratio of the inner diameter of the tube 38 to the inner diameter of the branch pipe 33d ((ratio of the inner diameter of the tube 38 / inner diameter of the branch pipe 33d) × 100) is preferably 1% or more, more preferably 5% or more. It is preferably 70% or less, more preferably 10% or less, preferably 1% or more and 70% or less, and more preferably 5% or more and 10% or less.

As shown in FIG. 1, the first drive source 4 is connected to the shaft portion 33s on the other side of the roll body 31 via a timing belt 40 in the liquid coating device 1. The first drive source 4 is electrically connected to the control unit 8, and the rotation is controlled by the control unit 8.

As shown in FIG. 1, the receiving roll 5 is formed in a substantially cylindrical shape in the liquid coating apparatus 1, and the shaft portions 50s and 50s provided at both ends in the rotation axis direction X are attached to the frames 10 and 10. It is rotatably supported. The receiving roll 5 is arranged to face the discharge roll 3, and the strip-shaped sheet (not shown) is nipated by the discharge roll 3 to convey the strip-shaped sheet to which the hot melt adhesive is applied by the discharge roll.

As shown in FIG. 1, the second drive source 6 is connected to the shaft portion 50s on the other side of the receiving roll 5 via the timing belt 60 in the liquid coating device 1. The second drive source 6 is electrically connected to the control unit 8, and the rotation is controlled by the control unit 8. In the liquid coating apparatus 1, as shown in FIG. 1, a drive source is provided for each of the discharge roll 3 and the receiving roll 5, but one drive source drives the discharge roll 3 and the receiving roll 5. Is also good.

As shown in FIG. 1, the contact / detachment mechanism 7 is configured so that the receiving roll 5 can be raised and lowered in the liquid coating device 1. The contact / detachment mechanism 7 is composed of a pair of air cylinders 70 and 70 and a solenoid valve (not shown). The air cylinders 70 and 70 expand and contract by opening and closing the solenoid valve, so that the receiving roll 5 is discharged from the discharge roll 3. It is designed to come into contact with the cylinder or to separate from the discharge roll 3. The contact / disconnection mechanism 7 (solenoid valve) is electrically connected to the control unit 8, and the control unit 8 controls the expansion and contraction of the pair of air cylinders 70 and 70.

Next, the coating operation of the liquid coating device 1 controlled by the control unit 8 will be described.
First, the hot melt adhesive is charged into the tank 20 of the supply unit 2, and the inside of the tank 20 is heated by using a heating means such as a heater to keep the charged hot melt adhesive in a molten state.

When the hot melt adhesive is in a molten state, the control unit 8 opens the first valve 20V of the tank 20 and the second valve 21V of the supply pipe 21 and starts the pump 22 to discharge the hot melt adhesive to the discharge roll 3. Send it toward. The hot melt adhesive delivered by the pump 22 flows into the discharge roll 3 through the supply pipe 21. The hot melt adhesive flowing into the discharge roll 3 flows into the tubes 38, 38 connected via the rotary joint 36, and fills the tubes 38, 38. At this time, since the inner diameters of the tubes 38 and 38 are smaller than those of the main pipe 33m and the branch pipe 33d, the hot melt adhesive is made to flow into the main pipe 33m and the branch pipe 33d to enter the main pipe 33m and the branch pipe 33d. Can be filled in a shorter time than filling.

Further, the control unit 8 drives the first drive source 4 to rotate the discharge roll 3. At this time, since the discharge roll 3 is connected to the supply pipe 21 of the supply unit 2 via the rotary joint 36, only the discharge roll 3 to which the shaft 36S of the rotary joint 36 is connected rotates. Further, the control unit 8 drives the second drive source 6 to rotate the receiving roll 5, and drives the contact / detaching mechanism 7 to nip the receiving roll 5 into the discharge roll 3. As a result, the strip-shaped sheet is conveyed by the discharge roll 3 and the receiving roll 5.

Then, when the inside of the tubes 38, 38 is filled with the hot melt adhesive, the hot melt adhesive is applied to the introduction holes 34h, 34h of the auxiliary plate 34 via the attachment / detachment portion 37 to which the other ends of the tubes 38, 38 are connected. It is introduced into the recesses 32 and 32 through the introduction holes 34h and 34h. The hot melt adhesive that has flowed into the recesses 32 and 32 diffuses in the recesses 32 and 32 and fills the recesses 32 and 32. The hot-melt adhesive that fills the recesses 32 and 32 penetrates the surface plate 30, and the hot-melt adhesive corresponds to a predetermined shape on the strip-shaped sheet that is nipated and conveyed by the discharge roll 3 and the receiving roll 5. It is discharged into the shapes of the recesses 32 and 32 of the pattern.

When the application of the hot melt adhesive to the strip-shaped sheet is completed, the control unit 8 stops the pump 22 and closes the first valve 20V and the second valve 21V to stop the supply of the hot melt adhesive. Further, the control unit 8 stops the driving of the first and second drive sources 4 and 6 and drives the contact / detachment mechanism 7 to separate the receiving roll 5 from the discharge roll 3. At this time, since the amount of the hot melt adhesive filled in the tubes 38 and 38 is relatively small with respect to the discharge amount discharged by the discharge roll 3, even when the discharge roll 3 is rotated by the inertial force, Centrifugal force due to the rotation prevents the hot melt adhesive from leaking from the surface plate 30.

As described above, according to the liquid coating apparatus 1 of the present embodiment, the tubes 38 and 38 arranged inside the main pipeline 33m and the branch pipeline 33d, that is, the main pipeline 33m and the branch pipeline 33d By inflowing the hot melt adhesive using the tubes 38, 38 having a small inner diameter, the recesses take less time than the hot melt adhesive flowing into the recesses 32, 32 through the main pipe line 33m and the branch pipe line 33d. It can be made to flow into 32 and 32. Therefore, the time until the hot melt adhesive starts to be discharged by the discharge roll 3 can be shortened.
Further, by flowing the liquid through the tubes 38, 38, the amount of the hot melt adhesive filled inside the tubes 38, 38 can be made relatively smaller than the discharge amount discharged by the discharge roll 3. , The variation in the discharge amount of the liquid (hot melt adhesive) discharged by the discharge roll 3 can be suppressed. For example, when the supply of the hot melt adhesive supplied from the supply unit 2 is stopped, the tubes 38, 38 The hot melt adhesive remaining inside is prevented from flowing out to the recesses 32 and 32 due to the centrifugal force generated by the rotation of the discharge roll 3 and leaking from the surface plate 30.
Further, in order to allow the hot melt adhesive to flow into the recesses 32 and 32 via the tubes 38, 38, the flow rate of the hot melt adhesive that supplies the main pipe 33 m and the branch pipe 33d of the main body portion 33 of the discharge roll 3 It can be easily formed using a drill of irrelevant size.
Furthermore, by attaching tubes having different thicknesses according to the discharge amount, desired discharge can be performed without changing the discharge roll according to the discharge amount.

As described above, according to the liquid coating apparatus 1, the time until the liquid is discharged by the discharge roll is shortened, the variation in the discharge amount of the liquid discharged by the discharge roll 3 is suppressed, and the liquid is discharged after the supply of the liquid is stopped. It is possible to prevent liquid leakage from the roll.

Although the present invention has been described above based on the preferred embodiment thereof, the present invention is not limited to the above-described embodiment.

For example, in the liquid coating apparatus 1, the entire outer peripheral surface of the roll main body 31 is covered with a 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 main body 31. , 32 may be composed of a porous material only in a portion covering only the portion.

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

Further, in the liquid coating apparatus 1, a roll body having two recesses 32, 32 formed on the outer peripheral surface is used, but the number of recesses in the roll body is not limited to this. The roll body may have one recess or two or more recesses.

The liquid coating apparatus described above has, for example, an adhesive portion made of a hot melt adhesive, and can be preferably used for producing an absorbent article that is fixed to clothing through the adhesive portion. Examples of such absorbent articles include sanitary napkins, panty liners, incontinence pads, and other absorbent articles that absorb liquid discharged from the body. These generally include a liquid-retaining front sheet, a liquid-impermeable (concept including impermeable) back sheet, and an absorber arranged between both sheets, and hot-melt adhesive to the clothing contact surface. It has an adhesive part made of an agent, or has wings on both the left and right sides of a vertically long main body part, and has an adhesive part made of a hot melt adhesive on one side (clothing contact surface) of the wing part. .. Adhesive portions may be provided on both the main body portion and the wing portion.
When producing such an absorbent article, the above-mentioned liquid is applied to the strip-shaped raw fabric of the sheet constituting the clothing contact surface or the strip-shaped or non-belt-shaped raw fabric of the sheet laminated with other materials. A hot melt adhesive is applied using a coating device to form an adhesive portion having a predetermined shape. Other than that, it is the same as the conventional method for producing an absorbent article.

1 Liquid coating device 2 Supply part 20 Tank 21 Supply pipe 22 Pump 3 Discharge roll 30 Surface plate 31 Roll body 32 Recessed 32d Recessed bottom 33 Main body part 33m Main pipe 33d Branch pipe 34 Auxiliary plate 34u Outer surface 35 pattern of auxiliary plate Shape plate 35r Inner part 36 Connection part 37 Detachable part 37a Joint 37b Flow rate adjustment mechanism 38 Tube

Claims (5)

A liquid coating device provided with a discharge roll that allows the liquid supplied from the supply unit to pass through the surface plate and discharge it in a predetermined shape, and coats the moving object to be coated with the liquid discharged from the discharge roll. ,
The surface plate constitutes the outer peripheral surface of the discharge roll, and recesses having a pattern corresponding to the predetermined shape are formed on the outer peripheral surface of the roll body constituting the portion inside the surface plate of the discharge roll. Cage,
Inside the roll body, a main pipeline extending in the rotation axis direction of the roll body and a branch pipeline extending from the main pipeline to the introduction hole provided at the bottom of the recess are formed in the shaft core portion. Has been
The discharge roll is detachably connected to a connection portion arranged at one end of the main pipeline and connected to the supply portion, and to the introduction hole provided at the bottom of the recess in the branch pipeline. It is provided with a detachable portion and a tube arranged inside the main pipeline to the branch pipeline.
The tube is a liquid coating device in which one end thereof is connected to the connection portion and the other end portion is connected to the attachment / detachment portion. The liquid coating apparatus according to claim 1, wherein the detachable portion has a joint for connecting the other end of the tube. The connection portion is a rotary joint that rotatably connects the roll body and the supply portion.
The liquid coating apparatus according to claim 1 or 2, wherein the one end portion of the tube is connected to the rotary joint. The liquid coating according to any one of claims 1 to 3, wherein the detachable portion has a flow rate adjusting mechanism for adjusting the flow rate of the liquid flowing into the bottom of the recess via the tube. apparatus. The roll main body is arranged on a main body portion including the shaft core portion, an auxiliary plate arranged on the outer peripheral surface of the main body portion and the detachable portion is arranged, and arranged on the outer peripheral surface of the auxiliary plate, and the predetermined value. With a pattern shape plate having a pattern opening corresponding to the shape,
The liquid coating apparatus according to any one of claims 1 to 4, wherein the recess of the roll body is formed by an inner portion of an opening of the pattern-shaped plate and an outer surface of the auxiliary plate.

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