JP6921648B2

JP6921648B2 - Ultrasonic welding device

Info

Publication number: JP6921648B2
Application number: JP2017125862A
Authority: JP
Inventors: 和也丸畠
Original assignee: Livedo Corp
Current assignee: Livedo Corp
Priority date: 2017-06-28
Filing date: 2017-06-28
Publication date: 2021-08-18
Anticipated expiration: 2037-06-28
Also published as: JP2019006060A

Description

本発明は、超音波溶着装置に関する。 The present invention relates to an ultrasonic welding device.

従来、シート部材の溶着に超音波溶着装置が用いられている。例えば、特許文献１の溶接ユニットは、アンビルローラーと、アンビルローラーと協同する超音波溶接ヘッドとを備える。アンビルローラーにおける円筒状の接触面には、複数の吸引部が周方向に間隔を空けて設けられる。各吸引部には、複数の吸引孔および複数の突出歯が設けられる。複数の吸引孔および複数の突出歯は、軸に平行な各列において交互に配置される。また、周方向に並ぶ複数の列において、軸方向における吸引孔の位置が互いに同じであり、突出歯の位置も互いに同じである。 Conventionally, an ultrasonic welding device has been used for welding a sheet member. For example, the welding unit of Patent Document 1 includes an anvil roller and an ultrasonic welding head that cooperates with the anvil roller. A plurality of suction portions are provided on the cylindrical contact surface of the anvil roller at intervals in the circumferential direction. Each suction portion is provided with a plurality of suction holes and a plurality of protruding teeth. A plurality of suction holes and a plurality of protruding teeth are arranged alternately in each row parallel to the axis. Further, in the plurality of rows arranged in the circumferential direction, the positions of the suction holes in the axial direction are the same as each other, and the positions of the protruding teeth are also the same as each other.

特開２０１６−１２０２７５号公報Japanese Unexamined Patent Publication No. 2016-20275

ところで、特許文献１のアンビルでは、突出歯の頂部と中心軸との間の距離が、吸引孔の縁部と中心軸との間の距離よりも大きく、突出歯の頂部と吸引孔の縁部との間に高低差が生じる。既述のように、周方向に並ぶ複数の列において、軸方向における突出歯の位置が互いに同じであるため、突出歯が周方向に連続して並ぶ。同様に、当該複数の列において、軸方向における吸引孔の位置も互いに同じであるため、吸引孔が周方向に連続して並ぶ。また、溶着の際には、アンビルの外周面上のシート部材に対して長手方向の張力は作用するが、長手方向に垂直な軸方向（シート部材の幅方向）には、ほとんど張力が作用しない。したがって、軸方向における吸引孔の位置にてシート部材の部位がアンビル側に窪み、かつ、軸方向における突出歯の位置にてシート部材の部位がヘッド側に突き出た状態、すなわち、シート部材が軸方向に弛んだ状態となる。このような状態で溶着が行われると、複数のシート部材における弛み具合の相違等により、溶着済みのシート部材において大きな皺が生じることがある。 By the way, in the anvil of Patent Document 1, the distance between the apex of the protruding tooth and the central axis is larger than the distance between the edge of the suction hole and the central axis, and the apex of the protruding tooth and the edge of the suction hole. There is a height difference between and. As described above, in the plurality of rows arranged in the circumferential direction, the positions of the protruding teeth in the axial direction are the same as each other, so that the protruding teeth are continuously arranged in the circumferential direction. Similarly, in the plurality of rows, the positions of the suction holes in the axial direction are the same as each other, so that the suction holes are continuously arranged in the circumferential direction. Further, at the time of welding, the tension in the longitudinal direction acts on the seat member on the outer peripheral surface of the anvil, but the tension hardly acts in the axial direction perpendicular to the longitudinal direction (width direction of the seat member). .. Therefore, the seat member portion is recessed toward the anvil side at the position of the suction hole in the axial direction, and the seat member portion protrudes toward the head side at the position of the protruding tooth in the axial direction, that is, the seat member is the shaft. It becomes loose in the direction. If welding is performed in such a state, large wrinkles may occur in the welded sheet member due to a difference in the degree of slack in the plurality of sheet members.

本発明は上記課題に鑑みなされたものであり、溶着の際にシート部材が軸方向に弛むことを抑制することを目的としている。 The present invention has been made in view of the above problems, and an object of the present invention is to prevent the sheet member from loosening in the axial direction during welding.

請求項１に記載の発明は、超音波溶着装置であって、中心軸を中心とする円筒状の外周面を有し、前記中心軸を中心として回転するアンビルと、前記アンビルの前記外周面と対向するヘッドを有し、前記ヘッドと前記外周面との間を通過する、連続シートである複数のシート部材を溶着する超音波振動部とを備え、前記アンビルが、前記外周面に設けられ、溶着の際に前記複数のシート部材を介して前記ヘッドと接する複数の凸部と、前記外周面において前記複数の凸部の間に設けられ、溶着の際にシート部材を保持する複数の吸引孔とを備え、各吸引孔に対して、周方向の両側に２つの凸部がそれぞれ隣接して配置され、前記アンビルの前記外周面において、前記中心軸に平行な軸方向に並ぶ複数の突起部が設けられ、前記各吸引孔が突起部に形成され、前記各吸引孔に対する前記２つの凸部が前記突起部の部位である。 The invention according to claim 1 is an ultrasonic welding apparatus, which has a cylindrical outer peripheral surface centered on a central axis and rotates about the central axis, and the outer peripheral surface of the anvil. The anvil is provided on the outer peripheral surface, and includes an ultrasonic vibrating portion that has facing heads and that welds a plurality of sheet members that are continuous sheets that pass between the head and the outer peripheral surface. A plurality of suction holes provided between the plurality of convex portions that come into contact with the head via the plurality of sheet members during welding and the plurality of convex portions on the outer peripheral surface and hold the sheet members during welding. For each suction hole, two convex portions are arranged adjacent to each other on both sides in the circumferential direction, and a plurality of protrusions arranged in the axial direction parallel to the central axis on the outer peripheral surface of the anvil. are provided, each suction hole is formed in the protrusion, the two protrusions for the respective suction holes Ru sites der of the protrusion.

請求項２に記載の発明は、請求項１に記載の超音波溶着装置であって、前記アンビルの前記外周面を平面に展開した場合に、前記各吸引孔の位置にて前記周方向に対応する方向に延びる直線を、前記位置を中心として前記中心軸に対応する方向の両側に３０度だけ回転した範囲が、前記各吸引孔に対する前記２つの凸部の少なくとも一部と重なる。 The invention according to claim 2 is the ultrasonic welding apparatus according to claim 1, and when the outer peripheral surface of the anvil is developed in a plane, the positions of the suction holes correspond to the circumferential direction. A range obtained by rotating a straight line extending in the direction to be rotated by 30 degrees on both sides in a direction corresponding to the central axis with respect to the position overlaps with at least a part of the two convex portions with respect to each suction hole.

請求項３に記載の発明は、請求項１または２に記載の超音波溶着装置であって、前記各吸引孔と前記各吸引孔に対する前記２つの凸部のそれぞれとの間の隙間の幅が、前記各吸引孔と前記各吸引孔に隣接する他の吸引孔との間の隙間の幅以下である。 The invention according to claim 3 is the ultrasonic welding apparatus according to claim 1 or 2, wherein the width of the gap between each suction hole and each of the two convex portions with respect to each suction hole is large. , The width of the gap between each suction hole and another suction hole adjacent to each suction hole.

請求項４に記載の発明は、請求項１ないし３のいずれか１つに記載の超音波溶着装置であって、前記各吸引孔が、前記突起部の先端面にて開口する。 The invention described in claim 4 is the ultrasonic welding apparatus according to any one of claims 1 to 3, wherein the suction holes, you open at the distal end surface of the protrusion.

本発明によれば、溶着の際にシート部材が中心軸の方向に弛むことを抑制することができる。 According to the present invention, it is possible to prevent the sheet member from loosening in the direction of the central axis during welding.

超音波溶着装置の構成を示す図である。It is a figure which shows the structure of the ultrasonic welding apparatus. アンビルを示す図である。It is a figure which shows the anvil. 突起部を拡大して示す図である。It is a figure which shows the protrusion by enlargement. 比較例のアンビルを示す図である。It is a figure which shows the anvil of a comparative example. 比較例のアンビル上のシート部材を示す図である。It is a figure which shows the seat member on the anvil of the comparative example. 突起部の他の例を示す図である。It is a figure which shows another example of a protrusion. アンビルの他の例を示す図である。It is a figure which shows another example of anvil. 突起部の他の例を示す図である。It is a figure which shows another example of a protrusion. アンビルの他の例を示す図である。It is a figure which shows another example of anvil.

図１は、本発明の一の実施の形態に係る超音波溶着装置１の構成を示す図である。超音波溶着装置１は、例えば、不織布を含む複数のシート部材９を互いに超音波溶着する装置であり、吸収性物品の製造に用いられる。 FIG. 1 is a diagram showing a configuration of an ultrasonic welding device 1 according to an embodiment of the present invention. The ultrasonic welding device 1 is, for example, a device for ultrasonically welding a plurality of sheet members 9 including a non-woven fabric to each other, and is used for manufacturing an absorbent article.

超音波溶着装置１は、アンビル（アンビルロールとも呼ばれる。）２と、超音波振動部３と、複数の案内ローラ４とを備える。アンビル２は、中心軸Ｊ１を中心とする円筒状の外周面２１を有する。アンビル２は、回転機構１１に接続されており、回転機構１１によりアンビル２が中心軸Ｊ１を中心として一定速度にて回転する。図１の例では、アンビル２は中心軸Ｊ１を中心として時計回りに回転する。複数の案内ローラ４は、中心軸Ｊ１に平行な回転軸を有し、連続シートである複数のシート部材９を重ねた状態で、アンビル２の外周面２１へと案内する。各シート部材９は、単一のシート、または、複数のシートの積層体である。アンビル２を通過した複数のシート部材９（後述の積層シート部材９０）の各部位は、図１の右側へと送られる。アンビル２の外周面２１では、各シート部材９に対して所定の大きさの張力が、その長手方向に作用する。アンビル２の詳細については後述する。 The ultrasonic welding device 1 includes an anvil (also referred to as an anvil roll) 2, an ultrasonic vibration unit 3, and a plurality of guide rollers 4. The anvil 2 has a cylindrical outer peripheral surface 21 centered on the central axis J1. The anvil 2 is connected to a rotation mechanism 11, and the rotation mechanism 11 rotates the anvil 2 at a constant speed about the central axis J1. In the example of FIG. 1, the anvil 2 rotates clockwise about the central axis J1. The plurality of guide rollers 4 have a rotation axis parallel to the central axis J1 and guide the plurality of seat members 9 which are continuous sheets to the outer peripheral surface 21 of the anvil 2 in a state of being stacked. Each sheet member 9 is a single sheet or a laminated body of a plurality of sheets. Each part of the plurality of sheet members 9 (laminated sheet member 90 described later) that has passed through the anvil 2 is sent to the right side of FIG. On the outer peripheral surface 21 of the anvil 2, a tension of a predetermined magnitude acts on each sheet member 9 in the longitudinal direction thereof. The details of Anvil 2 will be described later.

超音波振動部３は、ヘッド３１と、超音波発振部３２とを備える。超音波発振部３２は超音波に対応する周波数の電圧を発生させ、ヘッド３１に入力する。ヘッド３１は、振動子およびホーンを有する。振動子は超音波発振部３２からの電圧を縦振動に変換して超音波振動を生成する。ホーンは、アンビル２の外周面２１に対向する共鳴体である。超音波振動は、ホーンを介して外周面２１上の複数のシート部材９に伝達される。ヘッド３１では、振動子とホーンとの間にブースターが設けられてもよい。図１では、ヘッド３１において、アンビル２の外周面２１に対向する面、すなわち、シート部材９に接するホーンの端面に符号３１１を付している。当該端面３１１は、中心軸Ｊ１に平行な軸方向に延びる。図１の例では、当該端面３１１は、軸方向に垂直な方向（アンビル２の外周面２１の接線方向）に短い。 The ultrasonic vibration unit 3 includes a head 31 and an ultrasonic oscillation unit 32. The ultrasonic wave oscillator 32 generates a voltage having a frequency corresponding to the ultrasonic wave and inputs it to the head 31. The head 31 has a vibrator and a horn. The vibrator converts the voltage from the ultrasonic oscillating unit 32 into longitudinal vibration to generate ultrasonic vibration. The horn is a resonator facing the outer peripheral surface 21 of the anvil 2. The ultrasonic vibration is transmitted to the plurality of seat members 9 on the outer peripheral surface 21 via the horn. In the head 31, a booster may be provided between the vibrator and the horn. In FIG. 1, in the head 31, reference numerals 311 are attached to the surface of the anvil 2 facing the outer peripheral surface 21, that is, the end surface of the horn in contact with the seat member 9. The end face 311 extends in an axial direction parallel to the central axis J1. In the example of FIG. 1, the end surface 311 is short in the direction perpendicular to the axial direction (tangential direction of the outer peripheral surface 21 of the anvil 2).

図２は、アンビル２を示す図であり、中心軸Ｊ１に垂直な方向から見た外周面２１を示している。図２では、既述のヘッド３１も図示している。また、互いに重ねられた複数のシート部材９を１本の太い実線にて示している（後述の図４Ｂにおいて同様）。アンビル２の外周面２１では、ヘッド３１の端面３１１と対向しない（法線方向に重ならない）軸方向の範囲は、シート部材９の溶着に影響を及ぼさず、ヘッド３１の端面３１１と対向する軸方向の範囲（以下、「有効範囲」という。）が、溶着に有効となる。以下の説明において、単に外周面２１という場合は、有効範囲に含まれる外周面２１の領域を意味するものとする。 FIG. 2 is a diagram showing the anvil 2 and shows the outer peripheral surface 21 seen from the direction perpendicular to the central axis J1. In FIG. 2, the above-mentioned head 31 is also shown. Further, a plurality of sheet members 9 that are overlapped with each other are shown by one thick solid line (the same applies to FIG. 4B described later). On the outer peripheral surface 21 of the anvil 2, the axial range that does not face the end face 311 of the head 31 (does not overlap in the normal direction) does not affect the welding of the seat member 9, and the shaft that faces the end face 311 of the head 31. The range of directions (hereinafter referred to as "effective range") is effective for welding. In the following description, the term "outer peripheral surface 21" means the region of the outer peripheral surface 21 included in the effective range.

アンビル２は、複数の突起部２２と、複数の吸引孔２３とを備える。複数の突起部２２および複数の吸引孔２３は、外周面２１に設けられる。図２の例では、２以上の突起部２２が軸方向に一定間隔で並ぶことにより、突起部群２２０が形成される。突起部群２２０は、互いに隣接して配置される突起部２２の集合である。外周面２１には、複数の突起部群２２０が、中心軸Ｊ１を中心とする周方向に等角度間隔で設けられる。複数の突起部群２２０は、例えば、９０度間隔で配置される。典型的には、周方向における２つの突起部群２２０間のスペースの幅は、各突起部２２の周方向の長さよりも十分に大きい。各突起部群２２０における突起部２２の配列は、様々に変更されてよい。例えば、軸方向に並ぶ突起部２２の列を突起部列として、各突起部群２２０において複数の突起部列が周方向に隣接して配置されてもよい。 The anvil 2 includes a plurality of protrusions 22 and a plurality of suction holes 23. The plurality of protrusions 22 and the plurality of suction holes 23 are provided on the outer peripheral surface 21. In the example of FIG. 2, the protrusion group 220 is formed by arranging two or more protrusions 22 at regular intervals in the axial direction. The protrusion group 220 is a set of protrusions 22 arranged adjacent to each other. A plurality of protrusions 220 are provided on the outer peripheral surface 21 at equal angular intervals in the circumferential direction about the central axis J1. The plurality of protrusion groups 220 are arranged at intervals of 90 degrees, for example. Typically, the width of the space between the two protrusions 220 in the circumferential direction is sufficiently larger than the circumferential length of each protrusion 22. The arrangement of the protrusions 22 in each protrusion group 220 may be changed in various ways. For example, a row of protrusions 22 arranged in the axial direction may be used as a row of protrusions, and a plurality of rows of protrusions may be arranged adjacent to each other in the circumferential direction in each protrusion group 220.

図３は、突起部２２を拡大して示す図である。図３では、中心軸Ｊ１を中心とする周方向を符号Ｃ１を付す矢印にて示している（後述の図４Ａ、図５ないし図８において同様）。各突起部２２は先端面２２１を有し、当該先端面２２１は、当該突起部２２の位置における外周面２１の法線方向に垂直に広がる。先端面２２１の外形は、例えば円形である。複数（全て）の突起部２２において、中心軸Ｊ１から先端面２２１までの距離はほぼ同じである。複数の突起部２２の先端面２２１は、アンビル２において中心軸Ｊ１から最も離れた最外領域となる。正確には、先端面２２１は、外周面２１の有効範囲において最外領域であればよい。 FIG. 3 is an enlarged view showing the protrusion 22. In FIG. 3, the circumferential direction centered on the central axis J1 is indicated by an arrow having a reference numeral C1 (the same applies to FIGS. 4A, 5 to 8 described later). Each protrusion 22 has a tip surface 221 and the tip surface 221 extends perpendicularly to the normal direction of the outer peripheral surface 21 at the position of the protrusion 22. The outer shape of the tip surface 221 is, for example, circular. The distances from the central axis J1 to the tip surface 221 are substantially the same in the plurality (all) protrusions 22. The tip surfaces 221 of the plurality of protrusions 22 are the outermost regions of the anvil 2 that are farthest from the central axis J1. To be precise, the tip surface 221 may be the outermost region in the effective range of the outer peripheral surface 21.

図３に示すように、各吸引孔２３は突起部２２に形成される。具体的には、吸引孔２３は、突起部２２の先端面２２１の中央において開口する。吸引孔２３の縁部の全体は、当該先端面２２１に含まれる。すなわち、吸引孔２３の縁部全体は、アンビル２の最外領域に含まれる。吸引孔２３は、アンビル２の内部空間を介して減圧機構に接続される。吸引孔２３は、溶着の際に吸引によりシート部材９を保持する。ここで、吸引孔２３の周囲に位置する突起部２２の各部位を、凸部として捉えると、アンビル２の外周面２１には、複数の吸引孔２３と、複数の凸部とが設けられるといえる。複数の吸引孔２３は、複数の凸部の間に配置される。 As shown in FIG. 3, each suction hole 23 is formed in the protrusion 22. Specifically, the suction hole 23 opens at the center of the tip surface 221 of the protrusion 22. The entire edge of the suction hole 23 is included in the tip surface 221. That is, the entire edge of the suction hole 23 is included in the outermost region of the anvil 2. The suction hole 23 is connected to the decompression mechanism via the internal space of the anvil 2. The suction hole 23 holds the sheet member 9 by suction at the time of welding. Here, if each portion of the protrusion 22 located around the suction hole 23 is regarded as a convex portion, the outer peripheral surface 21 of the anvil 2 is provided with a plurality of suction holes 23 and a plurality of convex portions. I can say. The plurality of suction holes 23 are arranged between the plurality of convex portions.

図１の超音波溶着装置１では、複数の案内ローラ４により複数のシート部材９が互いに重なった状態でアンビル２の外周面２１に案内される。複数のシート部材９は、吸引孔２３により外周面２１上に保持された状態で、ヘッド３１と外周面２１との間を通過する。すなわち、ヘッド３１とアンビル２との間において、複数のシート部材９が外周面２１と同じ方向に同じ速度で移動する。また、超音波振動部３では、突起部群２２０がヘッド３１に対向する位置へと到達する際に、超音波振動が生成され、ヘッド３１の端面３１１と対向する複数のシート部材９の部位に、超音波振動が付与される。これにより、複数のシート部材９の当該部位において、突起部２２の先端面２２１と対向する領域が、超音波振動により溶着（接合）する。以下の説明では、溶着により互いに接合された複数のシート部材９を、「積層シート部材」という。図１では、積層シート部材に符号９０を付している。 In the ultrasonic welding device 1 of FIG. 1, a plurality of guide rollers 4 guide the plurality of sheet members 9 to the outer peripheral surface 21 of the anvil 2 in a state of being overlapped with each other. The plurality of sheet members 9 pass between the head 31 and the outer peripheral surface 21 in a state of being held on the outer peripheral surface 21 by the suction holes 23. That is, between the head 31 and the anvil 2, the plurality of seat members 9 move in the same direction as the outer peripheral surface 21 at the same speed. Further, in the ultrasonic vibration unit 3, when the protrusion group 220 reaches the position facing the head 31, ultrasonic vibration is generated, and the portion of the plurality of seat members 9 facing the end surface 311 of the head 31 is generated. , Ultrasonic vibration is applied. As a result, in the portion of the plurality of sheet members 9, the region of the protrusion 22 facing the tip surface 221 is welded (joined) by ultrasonic vibration. In the following description, a plurality of sheet members 9 joined to each other by welding are referred to as "laminated sheet members". In FIG. 1, reference numerals 90 are attached to the laminated sheet members.

積層シート部材９０では、溶着の際に各突起部２２に対向する領域が、互いに溶着した溶着領域となる。超音波溶着装置１では、突起部群２２０に対応する溶着領域群が、積層シート部材９０に対して長手方向に間欠的に形成される。例えば、パンツタイプの使い捨ておむつの製造において、使い捨ておむつの前方部に対応する部位が連続するシート部材と、後方部に対応する部位が連続するシート部材との間欠的な接合（サイドシール）等において、図２のアンビル２を利用した積層シート部材９０の形成が行われる。 In the laminated sheet member 90, a region facing each protrusion 22 at the time of welding becomes a welding region in which they are welded to each other. In the ultrasonic welding device 1, the welding region group corresponding to the protrusion group 220 is intermittently formed in the longitudinal direction with respect to the laminated sheet member 90. For example, in the manufacture of pants-type disposable diapers, in the intermittent joining (side seal) between a seat member having a continuous portion corresponding to the front portion of the disposable diaper and a seat member having a continuous portion corresponding to the rear portion of the disposable diaper. , The laminated sheet member 90 is formed using the anvil 2 of FIG.

ここで、特開２０１６−１２０２７５号公報（特許文献１）のように、中心軸に平行な各列において突出歯および吸引孔が交互に配置される比較例のアンビルを想定する。図４Ａは、比較例のアンビル８を示す図であり、アンビル８の外周面８１を平面に展開した展開図である。比較例のアンビル８では、突出歯８４の頂部と中心軸との間の距離が、吸引孔８３の縁部と中心軸との間の距離よりも大きく、突出歯８４の頂部と、吸引孔８３の縁部との間に高低差が生じる。また、周方向（図４中の矢印Ｃ１の方向）に並ぶ複数の列において、軸方向における突出歯８４の位置が互いに同じであるため、突出歯８４が周方向に連続して並ぶ。同様に、当該複数の列において、軸方向における吸引孔８３の位置も互いに同じであるため、吸引孔８３が周方向に連続して並ぶ。また、溶着の際には、アンビル８の外周面８１上のシート部材９に対して長手方向の張力は作用するが、長手方向に垂直な軸方向（シート部材９の幅方向）には、ほとんど張力が作用しない。したがって、図４Ｂに示すように、軸方向における吸引孔８３の位置にてシート部材９の部位がアンビル８側に窪み、かつ、軸方向における突出歯８４の位置にてシート部材９の部位がヘッド側に突き出た状態、すなわち、シート部材９が軸方向に弛んだ状態となる。このような状態で溶着が行われると、複数のシート部材９における弛み具合の相違等により、積層シート部材９０において大きな皺が生じることがある。 Here, as in Japanese Patent Application Laid-Open No. 2016-120275 (Patent Document 1), an anvil of a comparative example in which protruding teeth and suction holes are alternately arranged in each row parallel to the central axis is assumed. FIG. 4A is a diagram showing the anvil 8 of the comparative example, and is a developed view of the outer peripheral surface 81 of the anvil 8 developed in a plane. In the anvil 8 of the comparative example, the distance between the top of the protruding tooth 84 and the central axis is larger than the distance between the edge of the suction hole 83 and the central axis, and the top of the protruding tooth 84 and the suction hole 83 There is a height difference with the edge of the. Further, in a plurality of rows arranged in the circumferential direction (direction of arrow C1 in FIG. 4), since the positions of the protruding teeth 84 in the axial direction are the same as each other, the protruding teeth 84 are continuously arranged in the circumferential direction. Similarly, in the plurality of rows, the positions of the suction holes 83 in the axial direction are also the same as each other, so that the suction holes 83 are continuously arranged in the circumferential direction. Further, at the time of welding, a tension in the longitudinal direction acts on the seat member 9 on the outer peripheral surface 81 of the anvil 8, but in the axial direction perpendicular to the longitudinal direction (width direction of the seat member 9), most of the tension is applied. Tension does not work. Therefore, as shown in FIG. 4B, the portion of the seat member 9 is recessed toward the anvil 8 at the position of the suction hole 83 in the axial direction, and the portion of the seat member 9 is headed at the position of the protruding tooth 84 in the axial direction. The state of protruding to the side, that is, the state in which the seat member 9 is loosened in the axial direction. If welding is performed in such a state, large wrinkles may occur in the laminated sheet member 90 due to a difference in the degree of slack in the plurality of sheet members 9.

これに対し、図２のアンビル２を有する超音波溶着装置１では、アンビル２の外周面２１に複数の突起部２２が設けられ、各吸引孔２３が突起部２２の先端面２２１にて開口する。そして、溶着の際に、各吸引孔２３の縁部全体が、複数のシート部材９を介してヘッド３１の端面３１１と接する。このように、アンビル２の最外領域である突起部２２の先端面２２１にてシート部材９を吸引することにより、シート部材９が軸方向にある程度張った状態が維持される。すなわち、吸引孔２３によるシート部材９の吸引に起因して、溶着の際にシート部材９が軸方向に弛むことを抑制することができる。その結果、積層シート部材９０において大きな皺が生じることを防止することができる。 On the other hand, in the ultrasonic welding device 1 having the anvil 2 of FIG. 2, a plurality of protrusions 22 are provided on the outer peripheral surface 21 of the anvil 2, and each suction hole 23 is opened at the tip surface 221 of the protrusion 22. .. Then, at the time of welding, the entire edge portion of each suction hole 23 comes into contact with the end surface 311 of the head 31 via the plurality of sheet members 9. In this way, by sucking the seat member 9 on the tip surface 221 of the protrusion 22 which is the outermost region of the anvil 2, the seat member 9 is maintained in a state of being stretched to some extent in the axial direction. That is, it is possible to prevent the sheet member 9 from loosening in the axial direction during welding due to the suction of the sheet member 9 by the suction hole 23. As a result, it is possible to prevent large wrinkles from occurring in the laminated sheet member 90.

既述のように、アンビル２において、吸引孔２３の周囲に位置する突起部２２の各部位は、凸部として捉えることができる。溶着の際には、各凸部は、複数のシート部材９を介してヘッド３１と接する。ここで、シート部材９に対して、長手方向に所定の大きさの張力が付与されていることを考慮すると、各吸引孔２３に対して、周方向の両側に２つの凸部がそれぞれ隣接して配置されることにより、シート部材９において吸引孔２３に対向する部位が吸引によりアンビル２側に窪むことが抑制されているといえる。すなわち、各吸引孔２３に対する当該２つの凸部の存在により、吸引孔２３によるシート部材９の吸引に起因して、溶着の際にシート部材９が軸方向に弛むことが抑制されている。図３では、各突起部２２において上記２つの凸部に相当する部位（以下、単に「凸部」という。）に符号２４を付している。 As described above, in the anvil 2, each portion of the protrusion 22 located around the suction hole 23 can be regarded as a convex portion. At the time of welding, each convex portion comes into contact with the head 31 via a plurality of sheet members 9. Here, considering that a tension of a predetermined magnitude is applied to the seat member 9 in the longitudinal direction, two convex portions are adjacent to each suction hole 23 on both sides in the circumferential direction. It can be said that the portion of the seat member 9 facing the suction hole 23 is prevented from being depressed toward the anvil 2 side by suction. That is, the presence of the two convex portions on each suction hole 23 suppresses the sheet member 9 from loosening in the axial direction during welding due to the suction of the sheet member 9 by the suction hole 23. In FIG. 3, a reference numeral 24 is attached to a portion (hereinafter, simply referred to as “convex portion”) corresponding to the above two convex portions in each protrusion 22.

図３中の上記２つの凸部２４は、突起部２２において、他の部位と明確に区別可能なように設けられてもよい。例えば、図５に示す突起部２２では、円環状の先端面２２１において、吸引孔２３から放射状に延びる複数の溝２２２が形成される。図５の例では、周方向（図５中の矢印Ｃ１の方向）に対して４５度だけ傾斜した方向に延びる４個の溝２２２により、突起部２２が４個の凸部２４に分割される。この場合も、各吸引孔２３に対して、周方向の両側に２つの凸部２４がそれぞれ隣接して配置されるため、溶着の際にシート部材９が軸方向に弛むことを抑制することができる。 The two convex portions 24 in FIG. 3 may be provided in the protruding portion 22 so as to be clearly distinguishable from other portions. For example, in the protrusion 22 shown in FIG. 5, a plurality of grooves 222 radially extending from the suction hole 23 are formed on the annular tip surface 221. In the example of FIG. 5, the protrusion 22 is divided into four protrusions 24 by four grooves 222 extending in a direction inclined by 45 degrees with respect to the circumferential direction (direction of arrow C1 in FIG. 5). .. Also in this case, since the two convex portions 24 are arranged adjacent to each of the suction holes 23 on both sides in the circumferential direction, it is possible to prevent the sheet member 9 from loosening in the axial direction during welding. can.

アンビル２において、個別に設けられる凸部および吸引孔により、シート部材９の軸方向への弛みを抑制する上記構造が実現されてもよい。図６は、このようなアンビル２の外周面２１を平面に展開した展開図であり、複数の凸部２４および複数の吸引孔２３を拡大して示している。図６の例では、周方向に沿って凸部２４と吸引孔２３とが一定の隙間を空けて交互に設けられる。各吸引孔２３と当該吸引孔２３に対して周方向の両側に隣接して配置される２つの凸部２４のそれぞれとの間の隙間の幅Ｗ１は、例えば、当該吸引孔２３と当該吸引孔２３に最も隣接する他の吸引孔２３との間の隙間の幅Ｗ２以下であり、ここでは、吸引孔２３の幅（直径Ｄ１）以下である。また、周方向の各位置では、複数の凸部２４または複数の吸引孔２３が軸方向に一列に並ぶ。 In the anvil 2, the above-mentioned structure that suppresses the axial slack of the seat member 9 may be realized by the convex portions and the suction holes that are individually provided. FIG. 6 is a developed view of the outer peripheral surface 21 of the anvil 2 developed in a plane, and shows the plurality of convex portions 24 and the plurality of suction holes 23 in an enlarged manner. In the example of FIG. 6, the convex portions 24 and the suction holes 23 are alternately provided along the circumferential direction with a certain gap. The width W1 of the gap between each suction hole 23 and each of the two convex portions 24 arranged adjacent to each other on both sides in the circumferential direction with respect to the suction hole 23 is, for example, the suction hole 23 and the suction hole. The width of the gap between the suction holes 23 and the other suction holes 23 closest to the 23 is W2 or less, and here, the width of the suction holes 23 (diameter D1) or less. Further, at each position in the circumferential direction, a plurality of convex portions 24 or a plurality of suction holes 23 are arranged in a row in the axial direction.

凸部２４および吸引孔２３が独立して設けられる図６のアンビル２においても、各吸引孔２３に対して周方向の両側に２つの凸部２４がそれぞれ隣接して配置される。換言すると、各吸引孔２３に着目した場合に、周方向の両側のそれぞれにおいて、他の吸引孔２３よりも近接する凸部２４が存在する。図６のアンビル２においても、吸引孔２３によるシート部材９の吸引に起因して、溶着の際にシート部材９が軸方向に弛むことを抑制することができる。なお、図３および図５の例では、各吸引孔２３と当該吸引孔２３に対して周方向の両側に隣接して配置される２つの凸部２４のそれぞれとの間の隙間の幅は、ほぼ０であり、当該吸引孔２３と当該吸引孔２３に最も隣接する他の吸引孔２３との間の隙間の幅よりも十分に小さい。 Also in the anvil 2 of FIG. 6 in which the convex portion 24 and the suction hole 23 are independently provided, the two convex portions 24 are arranged adjacent to each of the suction holes 23 on both sides in the circumferential direction. In other words, when focusing on each suction hole 23, there are convex portions 24 closer to each of the suction holes 23 on both sides in the circumferential direction than the other suction holes 23. Also in the anvil 2 of FIG. 6, it is possible to prevent the sheet member 9 from loosening in the axial direction during welding due to the suction of the sheet member 9 by the suction hole 23. In the examples of FIGS. 3 and 5, the width of the gap between each suction hole 23 and each of the two convex portions 24 arranged adjacent to each other on both sides in the circumferential direction with respect to the suction hole 23 is determined. It is almost 0, which is sufficiently smaller than the width of the gap between the suction hole 23 and the other suction hole 23 closest to the suction hole 23.

また、図５の突起部２２において、吸引孔２３に対して、周方向から僅かに逸れた方向に凸部２４が設けられてもよい。例えば、図７に示す突起部２２では、吸引孔２３から周方向に延びる２個の溝２２２、および、周方向に垂直な方向に延びる２個の溝２２２が設けられ、突起部２２が４個の凸部２４に分割される。この場合も、各凸部２４は、吸引孔２３に対して、周方向に隣接して配置されているといえる。これにより、溶着の際にシート部材９が軸方向に弛むことを抑制することができる。 Further, in the protrusion 22 of FIG. 5, the protrusion 24 may be provided in a direction slightly deviated from the circumferential direction with respect to the suction hole 23. For example, the protrusion 22 shown in FIG. 7 is provided with two grooves 222 extending in the circumferential direction from the suction hole 23 and two grooves 222 extending in the direction perpendicular to the circumferential direction, and has four protrusions 22. It is divided into the convex portions 24 of the above. Also in this case, it can be said that each convex portion 24 is arranged adjacent to the suction hole 23 in the circumferential direction. As a result, it is possible to prevent the sheet member 9 from loosening in the axial direction during welding.

各吸引孔２３から凸部２４に向かう方向と、周方向とがなす角度は、シート部材９の軸方向への弛みが抑制される範囲内で適宜決定されてよい。ここで、図７のようにアンビル２の外周面２１を平面に展開した場合に、各吸引孔２３の中心の位置Ｐ１にて周方向に対応する方向に延びる直線Ｌ１を、位置Ｐ１を中心として中心軸Ｊ１に対応する方向の両側（すなわち、図７の右側および左側）に３０度だけ回転した範囲Ｒ１を設定する。各吸引孔２３に対して、周方向の一方側および他方側にそれぞれ最も隣接する２つの凸部２４の少なくとも一部が、当該範囲Ｒ１と重なる場合に、当該２つの凸部２４により、シート部材９の軸方向への弛みが適切に抑制されるといえる。当該２つの凸部２４のそれぞれの少なくとも一部は、直線Ｌ１を位置Ｐ１を中心として１５度だけ回転した範囲Ｒ２と重なることがより好ましく、これにより、シート部材９の軸方向への弛みが、より確実に抑制される。 The angle formed by the direction from each suction hole 23 toward the convex portion 24 and the circumferential direction may be appropriately determined within a range in which the slack in the axial direction of the seat member 9 is suppressed. Here, when the outer peripheral surface 21 of the anvil 2 is developed in a plane as shown in FIG. 7, a straight line L1 extending in a direction corresponding to the circumferential direction at the center position P1 of each suction hole 23 is centered on the position P1. A range R1 rotated by 30 degrees is set on both sides (that is, the right side and the left side of FIG. 7) in the direction corresponding to the central axis J1. When at least a part of the two convex portions 24 most adjacent to each of the suction holes 23 on one side and the other side in the circumferential direction overlaps the range R1, the two convex portions 24 cause the seat member. It can be said that the slack in the axial direction of 9 is appropriately suppressed. It is more preferable that at least a part of each of the two convex portions 24 overlaps the range R2 in which the straight line L1 is rotated about 15 degrees around the position P1, thereby causing the seat member 9 to slacken in the axial direction. It is more reliably suppressed.

個別に設けられる凸部２４および吸引孔２３により、シート部材９の軸方向への弛みを抑制する場合も、上記と同様に、吸引孔２３に対して、周方向から僅かに逸れた方向に凸部２４が設けられてもよい。図８の例では、複数の凸部２４が、周方向および軸方向にそれぞれ個別のピッチにて配列される。また、複数の凸部２４の配列において、凸部２４を頂点とする最小矩形の中央に吸引孔２３が配置される。この場合も、各凸部２４は、吸引孔２３に対して、周方向に隣接して配置されているといえ、溶着の際にシート部材９が軸方向に弛むことを抑制することができる。図８のように、凸部２４および吸引孔２３を配列する場合でも、各吸引孔２３に対して、周方向の両側に隣接する２つの凸部２４の少なくとも一部が、上記と同様にして設定される範囲Ｒ１と重なることが好ましく、範囲Ｒ２と重なることがより好ましい。 When suppressing the axial slack of the seat member 9 by the convex portions 24 and the suction holes 23 that are individually provided, the suction holes 23 are convex in a direction slightly deviated from the circumferential direction in the same manner as described above. The unit 24 may be provided. In the example of FIG. 8, a plurality of convex portions 24 are arranged at individual pitches in the circumferential direction and the axial direction. Further, in the arrangement of the plurality of convex portions 24, the suction hole 23 is arranged at the center of the minimum rectangle having the convex portion 24 as the apex. Also in this case, it can be said that the convex portions 24 are arranged adjacent to the suction holes 23 in the circumferential direction, and it is possible to prevent the sheet member 9 from loosening in the axial direction during welding. Even when the convex portions 24 and the suction holes 23 are arranged as shown in FIG. 8, at least a part of the two convex portions 24 adjacent to both sides in the circumferential direction with respect to each suction hole 23 is in the same manner as described above. It is preferable that it overlaps with the set range R1, and more preferably it overlaps with the range R2.

上記超音波溶着装置１では様々な変形が可能である。 The ultrasonic welding device 1 can be deformed in various ways.

アンビル２において突起部２２（および凸部２４）の形状は適宜変更されてよい。積層シート部材９０における溶着領域の形状は、突起部２２の形状に依存するため、突起部２２の形状を変更することにより、様々な形状の溶着領域を実現することができる。もちろん、突起部２２の個数やサイズ、配置についても適宜変更されてよい。 The shape of the protrusion 22 (and the protrusion 24) in the anvil 2 may be changed as appropriate. Since the shape of the welded region in the laminated sheet member 90 depends on the shape of the protrusion 22, it is possible to realize various shapes of the welded region by changing the shape of the protrusion 22. Of course, the number, size, and arrangement of the protrusions 22 may be changed as appropriate.

複数の突起部２２において、吸引孔２３が形成されない突起部２２が含まれてもよい。すなわち、全ての突起部２２に吸引孔２３が形成される必要はない。また、凸部２４および吸引孔２３が個別に設けられる場合に、全ての凸部２４が吸引孔２３に対して周方向に隣接する必要はなく、一部の凸部２４が、吸引孔２３から離れた位置に配置されてもよい。 The plurality of protrusions 22 may include protrusions 22 in which the suction holes 23 are not formed. That is, it is not necessary that the suction holes 23 are formed in all the protrusions 22. Further, when the convex portion 24 and the suction hole 23 are individually provided, it is not necessary for all the convex portions 24 to be adjacent to the suction hole 23 in the circumferential direction, and some of the convex portions 24 are provided from the suction hole 23. It may be arranged at a distant position.

図６および図８のアンビル２において、吸引孔２３の位置に、凸部２４よりも低い突起部２２が設けられ、当該突起部２２の先端面２２１にて吸引孔２３が開口してもよい。この場合、吸引孔２３の開口をシート部材９に近づけることができ、シート部材９をより強固に保持することが可能となる。 In the anvil 2 of FIGS. 6 and 8, a protrusion 22 lower than the convex portion 24 may be provided at the position of the suction hole 23, and the suction hole 23 may be opened at the tip surface 221 of the protrusion 22. In this case, the opening of the suction hole 23 can be brought closer to the seat member 9, and the seat member 9 can be held more firmly.

アンビル２の外周面２１において、突起部２２（凸部２４）および吸引孔２３が、周方向の全周に亘って配列形成されてもよい。 On the outer peripheral surface 21 of the anvil 2, the protrusions 22 (convex 24) and the suction holes 23 may be arranged so as to cover the entire circumference in the circumferential direction.

上記実施の形態では、２つのシート部材９が溶着されるが、３以上のシート部材９が互いに溶着されてもよい。 In the above embodiment, two sheet members 9 are welded, but three or more sheet members 9 may be welded to each other.

超音波溶着装置１は、吸収性物品の製造以外に用いられてもよい。また、シート部材９は、不織布以外のシートにより形成されてよい。 The ultrasonic welding device 1 may be used for purposes other than manufacturing an absorbent article. Further, the sheet member 9 may be formed of a sheet other than the non-woven fabric.

上記実施の形態および各変形例における構成は、相互に矛盾しない限り適宜組み合わされてよい。 The above-described embodiment and the configurations in each modification may be appropriately combined as long as they do not conflict with each other.

１超音波溶着装置
２アンビル
３超音波振動部
９シート部材
２１外周面
２２突起部
２３吸引孔
２４凸部
３１ヘッド
２２１先端面
Ｊ１中心軸 1 Ultrasonic welding device 2 Anvil 3 Ultrasonic vibration part 9 Seat member 21 Outer peripheral surface 22 Protruding part 23 Suction hole 24 Convex part 31 Head 221 Tip surface J1 Central axis

Claims

It is an ultrasonic welding device,
An anvil that has a cylindrical outer peripheral surface centered on the central axis and rotates around the central axis.
An ultrasonic vibration unit having a head facing the outer peripheral surface of the anvil and welding a plurality of sheet members which are continuous sheets passing between the head and the outer peripheral surface.
With
The anvil
A plurality of convex portions provided on the outer peripheral surface and in contact with the head via the plurality of sheet members during welding.
A plurality of suction holes provided between the plurality of convex portions on the outer peripheral surface and holding the sheet member during welding, and a plurality of suction holes.
With
For each suction hole, two protrusions are arranged adjacent to each other on both sides in the circumferential direction .
On the outer peripheral surface of the anvil, a plurality of protrusions arranged in the axial direction parallel to the central axis are provided, each suction hole is formed in the protrusion, and the two protrusions with respect to each suction hole are the protrusions. part ultrasonic welding apparatus according to claim sites der Rukoto of.

The ultrasonic welding apparatus according to claim 1.
When the outer peripheral surface of the anvil is developed in a plane, straight lines extending in the direction corresponding to the circumferential direction at the positions of the suction holes are formed on both sides of the direction corresponding to the central axis with the position as the center. An ultrasonic welding device characterized in that a range rotated by a degree overlaps with at least a part of the two convex portions for each suction hole.

The ultrasonic welding apparatus according to claim 1 or 2.
The width of the gap between each suction hole and each of the two convex portions with respect to each suction hole is equal to or less than the width of the gap between each suction hole and another suction hole adjacent to each suction hole. An ultrasonic welding device characterized by being.

The ultrasonic welding apparatus according to any one of claims 1 to 3.
Wherein the suction holes, ultrasonic welding apparatus according to claim opening to Rukoto at the distal end surface of the protrusion.