JP2014240034A - Hot melt adhesive coating applicator and hot melt adhesive coating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot melt adhesive coating applicator and a hot melt adhesive coating method in which even if a transport speed of a material to be coated is changed, variation of an amount of coating of a hot melt adhesive can be suppressed.SOLUTION: In a hot melt adhesive coating applicator, an adhering roll 14 and a clearance formation member 12 are disposed with a clearance 13 therebetween. A molten hot melt adhesive 4 is reserved above the clearance 13. A hot melt adhesive 5a, which passes the clearance 13 and is adhered to the adhering roll 14, is applied onto a pattern roll 16, and thereafter, the adhesive 5a is transferred to a material 72 to be coated. The clearance formation member 12 is moved in a direction, along which the member 12 approaches the adhering roll 14 and is separated from the roll 14, according to a revolution speed of the adhering roll 14, whereby the clearance 13 is changed.

Description

  The present invention relates to a hot melt adhesive coating apparatus and a hot melt adhesive coating method, and more particularly, to a hot melt adhesive coating apparatus and hot melt adhesive for continuously coating a hot melt adhesive on a strip-shaped material. It is related with the application | coating method.

  Various hot melt coating apparatuses for continuously applying a hot melt adhesive to a strip-shaped material to be coated have been proposed.

  For example, the hot-melt application device shown in the configuration diagram of FIG. 5 applies a hot-melt adhesive for adhering an absorbent pad onto the back sheet 111 when manufacturing a disposable diaper. In this hot melt coating apparatus, a hot melt adhesive is applied to the pattern roll 102 to which the silicon rubber plate is fixed by the hot melt supply unit 100. In the hot melt supply unit 100, the wearing roll 101a and the gap adjusting roll 101b are arranged with a gap therebetween, and the molten hot melt adhesive 4 can be stored on the gap. The hot melt adhesive that passes through the gap and adheres to the wearing roll 101 a is applied to the pattern roll 102. The hot melt adhesive applied to the pattern roll 102 is transferred to the back sheet 111 that passes between the pattern roll 102 and the pressure roll 103. The film 112 is overlaid on the back sheet 111 to which the hot melt adhesive is transferred, and the product sheet 110 is wound up (see, for example, Patent Document 1).

JP 2006-272215 A

  When the hot melt adhesive is applied using the hot melt adhesive application device of FIG. 5, the gap between the wearing roll 101a and the gap adjusting roll 101b is set to a predetermined size and is operated at a predetermined speed. , A desired coating amount can be obtained. However, after starting the operation of the hot melt adhesive application device, the hot melt adhesive does not reach the desired application amount until the predetermined speed is reached, or during the deceleration to stop, there are defects such as application unevenness. May occur. As a result, the product cannot be manufactured, and the material is wasted.

  In view of such circumstances, the present invention provides a hot-melt adhesive application apparatus and a hot-melt adhesive application method that can suppress fluctuations in the amount of hot-melt adhesive applied even when the conveying speed of the material to be applied changes. It is something to be offered.

  In order to solve the above-mentioned problems, the present invention provides a hot-melt adhesive application device configured as follows.

  In order to solve the above-mentioned problems, the present invention provides a hot-melt adhesive application device configured as follows.

  The hot melt adhesive applicator includes: (a) a wearing roll having an outer peripheral surface; and (b) a gap formed between the outer peripheral surface of the wearing roll, the gap being disposed adjacent to the outer roll, and the gap A gap forming member that allows hot melt adhesive that is melted above to be accumulated, and (c) an outer periphery on which a pattern that is disposed adjacent to the wearing roll and is transferred to the coated material is formed A pattern roll having a surface; and (d) a rotation drive unit that rotates the wearing roll, and the hot melt adhesive that has passed through the gap and adhered to the outer peripheral surface of the wearing roll is the pattern roll. It is of a type that is applied to the outer peripheral surface and then transferred to the material to be applied. The hot melt adhesive applicator (e) moves the gap forming member in a direction to contact or separate from the dosing roll according to the rotation speed of the dosing roll rotated by the rotation driving unit. Is further provided with a gap changing section for changing the gap.

  In the above configuration, the rotation speed of the dosing roll is changed according to the conveyance speed of the material to be coated. If the rotation speed of the dosing roll changes while the size of the gap between the outer peripheral surface of the dosing roll and the gap forming member remains constant, the thickness of the hot melt adhesive that adheres to the dosing roll will change, and The amount of hot melt adhesive applied changes. Therefore, the gap changing portion changes the gap between the outer peripheral surface of the wearing roll and the gap forming member according to the rotation speed of the wearing roll, and the thickness of the hot melt adhesive adhering to the wearing roll is made as constant as possible. By adjusting in this way, it is possible to suppress fluctuations in the amount of hot melt adhesive applied to the coating material.

  Therefore, even if the conveyance speed of the material to be coated changes, fluctuations in the amount of hot melt adhesive applied can be suppressed.

  Preferably, the rotational speed of the dosing roll is a relatively slow first rotational speed and a relatively fast second rotational speed, and the size of the gap is a relatively large first value. When the second value is relatively small, the gap changing unit sets the size of the gap to the first value according to the first rotation speed, and sets the gap according to the second rotation speed. The size of the gap is set to the second value.

  In this case, if the rotation speed of the dosing roll is increased, the gap between the outer peripheral surface of the dosing roll and the gap forming member is reduced, and if the rotating speed of the dosing roll is decreased, the outer peripheral surface of the dosing roll and the gap forming member is reduced. The gap between the two can be increased.

  When the rotating speed of the dosing roll increases, the hot melt adhesive accumulated above the gap between the outer peripheral surface of the dosing roll and the gap forming member causes the gap between the outer peripheral surface of the dosing roll and the gap forming member to The passing amount increases, and the thickness of the hot melt adhesive that adheres to the outer peripheral surface of the wearing roll increases. Therefore, if the rotation of the dosing roll becomes fast, the gap between the outer peripheral surface of the dosing roll and the gap forming member is reduced, and if the rotation of the dosing roll becomes slow, the gap between the outer peripheral surface of the wearing roll and the gap forming member is reduced. When the gap is increased, fluctuations in the thickness of the hot melt adhesive that adheres to the outer peripheral surface of the wearing roll can be suppressed, and fluctuations in the amount of hot melt adhesive applied to the material to be coated can be suppressed.

  Preferably, the said clearance gap change part changes the magnitude | size of the said clearance gap for every area of the said rotational speed of the said dosing roll.

  In this case, even if the rotation speed of the dosing roll varies within the same section, the size of the gap between the outer peripheral surface of the dosing roll and the gap forming member is not changed. Since it is not necessary to finely adjust the gap between the outer peripheral surface of the dosing roll and the gap forming member, the configuration can be simplified.

  Moreover, this invention provides the application method of the hot-melt-adhesive comprised as follows.

  The hot-melt adhesive application method is as follows: (i) a state in which the hot-melt adhesive melted is stored above the gap between the gap forming member and the gap forming member disposed adjacent to each other with a gap. In the first step of rotating the dressing roll to adhere the hot melt adhesive that has passed through the gap to the dressing roll, and (ii) a pattern roll disposed adjacent to the dressing roll, A second step of applying the hot melt adhesive adhering to the wearing roll; and (iii) a third step of transferring the hot melt adhesive applied to the pattern roll to a material to be applied. I have. In the first step, the size of the gap is changed according to the rotation speed of the dosing roll.

  The rotation speed of the dosing roll is changed according to the conveying speed of the material to be coated. In the first step, the thickness of the hot melt adhesive that adheres to the dosing roll changes when the rotation speed of the dosing roll changes while the size of the gap between the dosing roll and the gap forming member remains constant. The amount of hot melt adhesive applied to the coating material changes. Therefore, according to the rotation speed of the wearing roll, by changing the gap between the outer peripheral surface of the wearing roll and the gap forming member, and adjusting the thickness of the hot melt adhesive attached to the wearing roll as constant as possible, Variations in the amount of hot melt adhesive applied to the coating material can be suppressed.

  Therefore, even if the conveyance speed of the material to be coated changes, fluctuations in the amount of hot melt adhesive applied can be suppressed.

  Preferably, in the first step, the rotational speed of the dosing roll is a relatively slow first rotational speed and a relatively fast second rotational speed, and the size of the gap is relatively If the first value is large and the second value is relatively small, the size of the gap is set to the first value according to the first rotation speed, and the first rotation speed is set according to the second rotation speed. The size of the gap is set to the second value.

  In this case, if the rotation speed of the dosing roll is increased, the gap between the wearing roll and the gap forming member is reduced, and if the rotation speed of the dosing roll is decreased, the gap between the wearing roll and the gap forming member is reduced. Can be bigger.

  When the rotation speed of the dosing roll is increased, the amount of hot melt adhesive accumulated above the gap between the dosing roll and the gap forming member increases the amount passing through the gap between the dosing roll and the gap forming member, The thickness of the hot melt adhesive that adheres to the outer peripheral surface of the dosing roll increases. Therefore, if the rotation of the wearing roll is faster, the gap between the wearing roll and the gap forming member is reduced, and if the rotation of the wearing roll is slower, the gap between the wearing roll and the gap forming member is increased, The fluctuation | variation of the thickness of the hot melt adhesive adhering to the outer peripheral surface of a dosing roll can be suppressed, and the fluctuation | variation of the application quantity of the hot melt adhesive apply | coated to a to-be-coated material can be suppressed.

  Preferably, in the first step, the size of the gap is changed for each section of the rotation speed of the wearing roll.

  In this case, even if the rotation speed of the dosing roll varies within the same section, the size of the gap between the dosing roll and the gap forming member is not changed. Since it is not necessary to finely adjust the gap between the outer peripheral surface of the dosing roll and the gap forming member, the configuration can be simplified.

  ADVANTAGE OF THE INVENTION According to this invention, even if the conveyance speed of a to-be-coated material changes, the fluctuation | variation of the application quantity of a hot-melt-adhesive agent can be suppressed. A product can be manufactured even in a transient state where the conveying speed of the material to be coated changes, and the production efficiency can be increased.

It is a block diagram of a hot-melt-adhesive application apparatus (Example 1). It is a block diagram of a hot-melt-adhesive application apparatus (Example 1). It is a block diagram of a hot-melt-adhesive application apparatus (Example 1). It is a graph which shows the relationship between the rotational speed of a dosing roll, and a clearance gap (Example 1). It is a block diagram of a hot melt adhesive coating device (conventional example)

  Examples of the present invention will be described below with reference to FIGS.

  <Example 1> The hot-melt-adhesive coating device 10 of Example 1 of this invention is demonstrated referring FIGS. 1-4.

  FIG. 1 is a configuration diagram schematically showing a basic configuration of a hot-melt adhesive application device 10. As shown in FIG. 1, in the hot melt adhesive application device 10, the pattern roll 16 and the pressure roll 18 are arranged adjacent to each other so that the outer peripheral surfaces 16 s of the pattern roll 16 and the pressure roll 18 are close to each other. ing. The pattern roll 16 and the pressure roll 18 rotate while being synchronized in opposite directions as indicated by arrows 16r and 18r.

  A strip-shaped material 72 is conveyed along the outer peripheral surface 18 s of the pressure roll 18. The material 72 to be coated is disposed along the outer peripheral surface 18 s of the pressure roll 18, moves as indicated by arrows 72 p and 72 q as the pressure roll 18 rotates, and passes between the pattern roll 16 and the pressure roll 18. .

  The hot-melt adhesive supply unit 11 includes a first roll 12 that is a gap forming member and a second roll 14 that is a wearing roll formed on the outer peripheral surfaces 12 s and 14 s of the first and second rolls 12 and 14. It arrange | positions adjacent so that the clearance gap 13 may be formed in between. Above the first and second rolls 12 and 14, a supply port 6 for supplying molten hot melt is provided. The first and second rolls 12 and 14 are heated by a heater (not shown), and on the portion where the first and second rolls 12 and 14 approach each other, that is, of the first and second rolls 12 and 14. The melted hot melt accumulates above the gap 13 to form the reservoir 4.

  The first roll 14 of the hot melt adhesive supply unit 11 is placed on the pattern roll 16 so that the outer peripheral surface 14s of the first roll 14 and the outer peripheral surface 16s of the pattern roll 16 approach each other with a predetermined gap. Adjacent to each other.

  Next, the basic operation of the hot melt adhesive applicator 10 will be described.

  The 1st and 2nd rolls 12 and 14 of the hot-melt-adhesive supply part 11 rotate in the direction shown by arrow 12r, 14r, for example. A part of the melted hot melt adhesive in the storage unit 4 passes through the gap 13 between the first and second rolls 12 and 14 as the second roll 14 rotates, and the first roll 14. It is conveyed while adhering to the outer peripheral surface 14s.

  When the hot melt adhesive 5 a attached to the outer peripheral surface 14 s of the first roll 14 reaches a position facing the outer peripheral surface 16 s of the pattern roll 16, it is applied to the outer peripheral surface 16 s of the pattern roll 16.

  The hot melt adhesive 5 b applied to the outer peripheral surface 16 s of the pattern roll 16 moves with the rotation of the pattern roll 16, and passes through the space between the pattern roll 16 and the pressure roll 18. 72b is transferred to the main surface 72a on the pattern roll 16 side. The hot melt adhesive 5 c transferred to the material to be coated 72 is conveyed together with the material to be coated 72.

  The hot melt adhesive supply unit 11 is configured to be able to change the size of the gap 13 between the first and second rolls 12 and 14.

  FIG. 2 is a configuration diagram conceptually showing the configuration of the hot melt adhesive supply unit 11. As shown in FIG. 2, the first support portion 11 a that rotatably supports the rotating shaft 12 x of the first roll 12 has a first roll 12 relative to the second roll 14 as indicated by an arrow 11 p. Are supported by the common part 11c so as to be movable in the direction in which they come in and out of contact with each other, and are positioned by the first drive mechanism 11m. A position sensor 56 for detecting the position of the first support portion 11a is fixed to the common portion 11c.

  The second support portion 11b that rotatably supports the rotation shaft 14x of the second roll 14 is fixed to the common portion 11c so as not to move. The common part 11c is movable in the direction in which the second roll 14 contacts and separates from the pattern roll 16 (not shown in FIG. 2) as indicated by an arrow 11q, and the apparatus main body of the hot melt adhesive supply part 11 10x and is positioned by the second drive mechanism 11n.

  What is necessary is just to comprise the 1st and 2nd drive mechanisms 11m and 11n suitably. For example, in the first drive mechanism 11m, a nut portion is provided on the first support portion 11a, and a screw shaft that is screwed into the nut portion is fixed by a gap setting motor 58 (see FIG. 3) fixed to the common portion 11c. The first support portion 11a is configured to be screw-fed to the common portion 11c by turning. In this case, it is preferable to use, for example, a ball screw so that play (backlash) does not occur due to screw feeding.

  FIG. 3 is a block diagram showing the configuration of the control system of the hot melt adhesive application apparatus 10. As shown in FIG. 3, an operation panel 52, a drive motor 54, a position sensor 56, and a gap setting motor 58 are connected to the control unit 50 that controls the overall apparatus.

  In addition to the CPU, the control unit 50 includes a ROM that stores programs and the like, a RAM that temporarily stores data, and the like, and performs control according to a predetermined program. By operating the operation panel 52, the operation speed of the hot melt adhesive coating apparatus 10, that is, the conveyance speed of the material to be coated and the roll rotation speed can be set. The drive motor 54 is a rotational drive unit, and rotationally drives at least the second roll 14 and the pattern roll 16. Note that the second roll 14 and the pattern roll 16 may be independently rotated by using a plurality of drive motors 54. The first roll 12 and the pressure roll 18 may be rotationally driven by the drive motor 54, may be rotationally driven by a drive source different from the drive motor 54, and may be idled without being rotationally driven, It is also possible to stop it. When the first drive mechanism 11m is operated by the gap setting motor 58, the first support portion 11a moves, and the size of the gap 13 between the first and second rolls 12 and 14 changes.

  The control unit 50 controls the rotation speed of the drive motor 54 according to the operation speed of the hot melt adhesive application device 10 set by the operation panel 52. Further, the control unit 50 calculates the size of the gap 13 between the first and second rolls 12 and 14 from the position of the first support portion 11a detected by the position sensor 56, and the size of the gap 13 is calculated. Then, the gap setting motor 58 is rotated so that the desired value corresponding to the operation speed of the hot melt adhesive application device 10 set by the operation panel 52 is obtained.

  The controller 50 reduces the gap 13 between the first and second rolls 12 and 14 if the operating speed of the hot melt adhesive application device 10 is increased, and the first and first if the operating speed is decreased. The gap 13 between the two rolls 12 and 14 is increased. For example, the size of the gap 13 is set to a relatively large first value according to the relatively slow first operating speed, and the size of the gap 13 is set according to the relatively fast second operating speed. A relatively small second value is set. Since the operation speed and the rotation speed of the second roll 14 are proportional, when the first operation speed is relatively slow, the second roll 14 has the relatively slow first rotation speed, and the relatively fast first speed. When the operation speed is 2, the second roll 14 has a relatively high second rotation speed.

  When the operation speed of the hot melt adhesive application device 10 is increased, the rotational speed of the second roll 14 is increased, and the hot melt adhesion accumulated above the gap 13 between the first and second rolls 12 and 14 is increased. The amount of the agent that passes through the gap 13 between the first and second rolls 12 and 14 increases, and the thickness of the hot melt adhesive 5a that adheres to the outer peripheral surface 14s of the second roll 14 increases. Therefore, if the rotation speed of the second roll 14 is increased, the gap 13 between the first and second rolls 12 and 14 is reduced, and if the rotation of the second roll 14 is decreased, the first and second rolls 14 and 14 are rotated. When the gap 13 between the two rolls 12 and 14 is increased, the hot melt applied to the material 72 to be applied is suppressed while suppressing the variation in the thickness of the hot melt adhesive 5a adhering to the outer peripheral surface 14s of the second roll 14. Variations in the coating amount of the melt adhesive 5c can be suppressed.

  If an example is given, the control part 50 will change the clearance gap 13 in steps according to a driving speed, as shown to the graph of FIG. The horizontal axis in FIG. 4 indicates the operation speed of the hot melt adhesive application device 10, that is, the rotation speed of the drive motor 54, and the vertical axis indicates the size of the gap 13 between the first and second rolls 12 and 14. Show. The operating speeds v1 to v5 shown in FIG. 4 have a relationship of v1 <v2 <v3 <v4 <v5, and the gaps d1 to d5 have a relationship of d1> d2> d3> d4> d5. As shown in FIG. 4, the control unit 50 sets the size of the gap 13 to d1 when the operation speed is set to v1 or less. When the operation speed exceeds v1 and is set to v2 or less, the control unit 50 sets the size of the gap 13 to d2. When the operation speed exceeds v2 and is set to v3 or less, the control unit 50 sets the size of the gap 13 to d3. When the operation speed exceeds v3 and is set to v4 or less, the control unit 50 sets the size of the gap 13 to d4. When the operation speed exceeds v4 and is set to v5 or less, the control unit 50 sets the size of the gap 13 to d5.

  The control unit 50, the position sensor 56, the gap setting motor 58, and the first drive mechanism 11m are gap change units, and according to the rotation speed of the second roll 14 rotated by the drive motor 54, The gap 13 between the first and second rolls 12 and 14 is changed by moving the first roll 12 in a direction in which the first roll 12 is in contact with and away from the second roll 14.

  Although it is possible to continuously change the gap according to the operation speed, in that case, it is necessary to configure the gap so that the gap can be finely adjusted, which complicates the configuration. As shown in FIG. 4, if the gap is changed stepwise according to the operation speed, it is not necessary to finely adjust the gap. This simplifies the configuration.

  <Summary> As described above, the size of the gap 13 between the first and second rolls 12 and 14 is changed according to the operation speed of the hot melt adhesive application device 10 to be applied. Even if the conveyance speed of the material 72 changes, fluctuations in the amount of hot melt adhesive applied can be suppressed. A product can be manufactured even in a transient state where the conveying speed of the material to be coated changes, and the production efficiency can be increased.

  The present invention is not limited to the above embodiment, and can be implemented with various modifications.

  For example, a gap forming member having a configuration different from that of the first roll 12 may be used. The hot melt adhesive of the pattern roll 16 may be once transferred to another member (for example, a transfer roll) and then transferred to the material to be coated.

DESCRIPTION OF SYMBOLS 4 Storage part 5a-5c Hot-melt-adhesive 6 Supply port 10 Hot-melt-adhesive application apparatus 10x Apparatus main body 11 Hot-melt-adhesive supply part 11a 1st support part 11b 2nd support part 11c Common part 11m 1st drive Mechanism (gap changing part)
11n Second drive mechanism 12 First roll (gap forming member)
12s outer peripheral surface 12x rotating shaft 13 gap 14 second roll (wearing roll)
14s outer peripheral surface 14x rotating shaft 16 pattern roll 16s outer peripheral surface 18 pressure roll 18s outer peripheral surface 50 control unit (gap changing unit)
52 Operation panel 54 Drive motor 56 Position sensor (gap changing part)
58 Gap setting motor (gap changing part)
72 Material to be coated

It is a block diagram of a hot-melt-adhesive application apparatus (Example 1). (Example 1) which is a block diagram of the hot-melt-adhesive supply part of a hot-melt-adhesive coating device . (Example 1) which is a block diagram of the control system of a hot-melt-adhesive application apparatus. It is a graph which shows the relationship between the rotational speed of a dosing roll, and a clearance gap (Example 1). It is a block diagram of a hot melt adhesive coating device (conventional example)

Claims (6)

A wearing roll having an outer peripheral surface;
A gap forming member that is arranged adjacent to the form roll and forms a gap with the outer peripheral surface of the form roll so that hot melt adhesive melted above the gap can be collected. When,
A pattern roll having an outer peripheral surface on which a pattern to be transferred to a material to be coated is formed adjacent to the wearing roll, and
A rotation drive unit for rotating the wearing roll;
With
In the hot melt adhesive coating apparatus in which the hot melt adhesive that passes through the gap and adheres to the outer peripheral surface of the wearing roll is applied to the outer peripheral surface of the pattern roll and then transferred to the material to be coated. ,
A gap changing unit that changes the gap by moving the gap forming member in a direction of coming into contact with and separating from the wearing roll according to a rotation speed of the wearing roll rotated by the rotation driving unit. A hot melt adhesive applicator characterized by comprising: The rotational speed of the dosing roll is a relatively slow first rotational speed and a relatively fast second rotational speed,
When the size of the gap is a relatively large first value and a relatively small second value,
The gap changing unit sets the size of the gap to the first value according to the first rotation speed, and sets the size of the gap to the second value according to the second rotation speed. The hot melt adhesive coating apparatus according to claim 1, wherein   The hot melt adhesive coating apparatus according to claim 1, wherein the gap changing unit changes the size of the gap for each section of the rotation speed of the wearing roll. In the state where the molten hot melt adhesive is accumulated above the gap between the gap forming member and the gap forming member disposed adjacently with a gap, the gap is rotated to rotate the gap. A first step of attaching the hot melt adhesive that has passed through
A second step of applying the hot melt adhesive adhering to the wearing roll to a pattern roll disposed adjacent to the wearing roll;
A third step of transferring the hot melt adhesive applied to the pattern roll to a material to be applied;
With
In the first step, the size of the gap is changed in accordance with the rotation speed of the dosing roll. In the first step,
The rotational speed of the dosing roll is a relatively slow first rotational speed and a relatively fast second rotational speed, and the size of the gap is relatively large with respect to the first value. If the second value is small, the size of the gap is set to the first value according to the first rotation speed, and the size of the gap is set to the second value according to the second rotation speed. The method for applying a hot melt adhesive according to claim 4, wherein the value is a value.   The hot melt adhesive application method according to claim 4 or 5, wherein, in the first step, the size of the gap is changed for each section of the rotation speed of the wearing roll.

Images