JP2019006049A - Ultrasonic wave deposition device - Google Patents

Abstract

To conduct deposition of a sheet member stably.SOLUTION: An ultrasonic wave deposition device has an anvil 2 having a cylindrical outer periphery surface 21 and an ultrasonic wave vibration part. A head 31 of the ultrasonic wave vibration part has a tip surface 311 extending in a direction parallel to a central axis of the anvil 2. An outer periphery surface 21 of the anvil 2 has convexoconcave, and an outermost area apart from the central axis by a constant distance is contact with the tip surface 311 via the sheet member 9. In the outer periphery surface 21, a non-deposition range A1 where the sheet member 9 is not deposited and a deposition range A2 where the sheet member 9 can be deposited are arranged alternatively. At each position in a circumferential direction in the outer periphery surface 21, area percentage of the outermost region in the deposition range A2 is lower than the non-deposition range A1, where a percentage of the outermost region in a region facing the tip surface 311 is the area percentage of the outermost region. A head 31 passes the deposition range A2 and the non-deposition range A1 while maintaining an ON state. Thereby deposition of the sheet member 9 can be conducted stably.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an ultrasonic welding apparatus.

  Conventionally, an ultrasonic welding apparatus has been used for welding sheet members. 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 part is provided with a plurality of suction holes and a plurality of protruding teeth. The plurality of suction holes and the plurality of protruding teeth are alternately arranged in each row parallel to the axis.

JP, 2016-120275, A

  By the way, as in Patent Document 1, in the anvil, when the region where the protruding teeth are provided and the region where the protruding teeth are not provided are alternately set in the circumferential direction, the head is anvil in the region where the protruding teeth are not provided. It will be in the state away from. At this time, if the head is kept in the ON state, the head may be damaged. Therefore, the head is in the OFF state while facing the area. However, in the head, after switching from the OFF state to the ON state, a certain amount of time is required until welding becomes possible stably. Therefore, when the head is switched from the OFF state to the ON state when the head is opposed to the region where the protruding teeth are provided, the strength of the welding may be weakened at the portion of the sheet member that is welded immediately after the switching.

  This invention is made | formed in view of the said subject, and aims at performing the welding of a sheet | seat member stably.

  The invention according to claim 1 is an ultrasonic welding apparatus, which has a cylindrical outer peripheral surface with a central axis as a center, an anvil that rotates around the central axis, and a direction parallel to the central axis A tip end surface extending to the anvil has a head facing the outer peripheral surface, and includes an ultrasonic vibration section that welds a plurality of sheet members that pass between the head and the outer peripheral surface. The outer peripheral surface has irregularities, and the outermost surface of the outer peripheral surface, which is separated from the central axis by a certain distance, is in contact with the tip end surface of the head via the plurality of sheet members during welding, and the outer peripheral surface In the surface, a non-welding range in which the plurality of sheet members are not welded and a welding range in which the plurality of sheet members can be welded are alternately provided in the circumferential direction, and at each position in the circumferential direction on the outer circumferential surface. The plurality The area ratio of the outermost region in the region facing the front end surface through the sheet member is defined as the area ratio of the outermost region, and the area ratio of the outermost region in the welding range is in the non-welding range. It is lower than the area ratio of the outermost region, and the head passes through the welding range and the non-welding range while maintaining the ON state.

  A second aspect of the present invention is the ultrasonic welding apparatus according to the first aspect, wherein a part of the outermost region is surrounded by a recess in the welding range.

  The invention according to claim 3 is the ultrasonic welding apparatus according to claim 1 or 2, wherein a suction hole for holding a sheet member at the time of welding is formed on the outer peripheral surface of the anvil, and the suction is performed. The edge of the hole is included in the outermost region.

  The invention according to claim 4 is the ultrasonic welding apparatus according to claim 3, wherein the suction hole exists in the welding range.

  Invention of Claim 5 is an ultrasonic welding apparatus as described in any one of Claim 1 thru | or 4, Comprising: The area ratio of the said outermost area | region is 85% or more in the said outer peripheral surface of the said anvil. A range in the circumferential direction is included in the non-welding range, and a range in the circumferential direction in which the area ratio of the outermost region is greater than 0% and 35% or less is included in the welding range.

  According to the present invention, the sheet member can be stably welded.

It is a figure which shows the structure of an ultrasonic welding apparatus. It is a figure which shows an anvil. It is a figure which shows the anvil seen along the central axis. It is a figure which shows the welding area | region of a lamination sheet member. It is a figure which shows the other example of an anvil. It is a figure which shows the other example of an anvil.

  FIG. 1 is a diagram showing a configuration of an ultrasonic welding apparatus 1 according to an embodiment of the present invention. The ultrasonic welding apparatus 1 is an apparatus that ultrasonically welds a plurality of sheet members 9 including a nonwoven fabric, for example, and is used for manufacturing an absorbent article.

  The ultrasonic welding apparatus 1 includes an anvil (also called 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 around the central axis J1. The anvil 2 is connected to the rotation mechanism 11, and the anvil 2 is rotated at a constant speed around the central axis J1 by the rotation mechanism 11. 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 sheet members 9 that are continuous sheets to the outer peripheral surface 21 of the anvil 2 in a stacked state. Each sheet member 9 is a single sheet or a laminate 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 predetermined magnitude of tension acts on the plurality of sheet members 9. Details of the anvil 2 will be described later.

  The ultrasonic vibration unit 3 includes a head 31 and an ultrasonic oscillation unit 32. The ultrasonic oscillator 32 generates a voltage having a frequency corresponding to the ultrasonic wave and inputs the voltage to the head 31. The head 31 has a vibrator and a horn. The vibrator converts the voltage from the ultrasonic oscillator 32 into longitudinal vibration to generate ultrasonic vibration. The horn is a resonator that faces the outer peripheral surface 21 of the anvil 2. The ultrasonic vibration is transmitted to the plurality of sheet 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 the following description, the surface of the head 31 that faces the outer peripheral surface 21 of the anvil 2, that is, the end surface of the horn that is in contact with the sheet member 9 is referred to as “tip surface 311”. The tip surface 311 extends in the axial direction parallel to the central axis J1. In the example of FIG. 1, the front end surface 311 is short in the direction perpendicular to the axial direction (the tangential direction of the outer peripheral surface 21 of the anvil 2).

  FIG. 2 is a diagram showing the anvil 2, and shows the outer peripheral surface 21 viewed from a direction perpendicular to the central axis J1. In FIG. 2, the range in the axial direction where the sheet member 9 exists is indicated by an arrow with the same reference numeral 9. Further, the above-described head 31 is also illustrated. FIG. 3 is a view showing the anvil 2 viewed along the central axis J1. In the outer peripheral surface 21 of the anvil 2 shown in FIG. 2, the axial range that does not face the front end surface 311 of the head 31 (does not overlap the normal direction) does not affect the welding of the sheet member 9, The opposing axial range (hereinafter referred to as “effective range”) is effective for welding. In the following description, the simple term “outer peripheral surface 21” means a region of the outer peripheral surface 21 included in the effective range.

  The anvil 2 includes a plurality of rectangular recesses 22, and the plurality of recesses 22 are formed on the outer peripheral surface 21. Details of the arrangement of the recesses 22 will be described later. The outer peripheral surface 21 of the anvil 2 is a cylindrical surface separated from the central axis J1 by a certain distance (see FIG. 3), and the plurality of recesses 22 include, for example, hole processing or groove processing (deburring processing) on the outer peripheral surface 21. .). Some of the plurality of recesses 22 are connected to the decompression mechanism via the internal space of the anvil 2. The concave portion 22 connected to the pressure reducing mechanism serves as a suction hole for holding the sheet member 9 during welding. In the anvil 2, all the recesses 22 may be connected to a pressure reducing mechanism. That is, at least a part of the plurality of recesses 22 is formed as a suction hole.

  When a region excluding the plurality of concave portions 22 on the outer peripheral surface 21 is referred to as a non-recessed region 24, the non-recessed region 24 is the outermost region farthest from the central axis J <b> 1 on the outer peripheral surface 21. Precisely, the non-recessed region 24 may be the outermost region in the effective range of the outer peripheral surface 21. In the non-recessed region 24, the distance from the central axis J1 is the same at any position. Since the plurality of recesses 22 are provided discretely (isolated from each other), the non-recess region 24 continues over the entire circumference of the outer peripheral surface 21.

  In the example of FIG. 2, two or more recesses 22 are arranged at regular intervals in the axial direction to form a recess row 23. A set of a plurality of recess rows 23 (two in FIG. 2) adjacent to each other in the circumferential direction centering on the central axis J1 is defined as a recess row group 230, and the plurality of recess row groups 230 are arranged in the circumferential direction on the outer peripheral surface 21. Are provided at equiangular intervals (see FIG. 3). The plurality of recess row groups 230 are arranged at intervals of 90 degrees, for example. Typically, the width of the space between the two recess array groups 230 in the circumferential direction is sufficiently larger than the circumferential length of each recess 22. Further, the gap between the adjacent recess rows 23 in each recess row group 230 is smaller than the circumferential length of each recess 22. In the recess row group 230, the positions of the plurality of recess rows 23 in the axial direction may vary along the circumferential direction. Further, the recess row group 230 may be one recess row 23.

  As will be described later, in the space between the two recess row groups 230, the plurality of sheet members 9 cannot be welded, and the region where the recess row groups 230 are provided (except for the gap between the adjacent recess rows 23). Then, it becomes possible to weld a plurality of sheet members 9. That is, in the anvil 2, a non-welding range A1 in which the plurality of sheet members 9 are not welded on the outer peripheral surface 21 and a welding range A2 in which the plurality of sheet members 9 can be welded are alternately provided in the circumferential direction. In FIG. 2 and FIG. 3, the non-welding range A1 is indicated by an arrow denoted by reference symbol A1, and the welding range A2 is indicated by an arrow denoted by reference symbol A2.

  When the ultrasonic welding apparatus 1 of FIG. 1 welds a plurality of sheet members 9, ultrasonic vibration is continuously generated by continuous driving of the ultrasonic vibration unit 3 and the anvil 2 rotates. In other words, the head 31 passes through the welding range A2 and the non-welding range A1 on the outer peripheral surface 21 of the anvil 2 alternately while maintaining the ON state. Further, the plurality of sheet members 9 are guided to the outer peripheral surface 21 of the anvil 2 in a state of being overlapped with each other by the plurality of guide rollers 4, and pass between the head 31 and the outer peripheral surface 21. Thereby, ultrasonic vibration is applied to each part of the plurality of sheet members 9 facing the front end surface 311 of the head 31. At this time, in the welding range A2, the plurality of sheet members 9 are held on the outer peripheral surface 21 by the recesses 22 (suction holes) connected to the pressure reducing mechanism. That is, between the head 31 and the anvil 2, the plurality of sheet members 9 move in the same direction as the outer peripheral surface 21 at the same speed. As a result, in the plurality of sheet members 9, the region facing the non-recessed region 24 in the welding range A <b> 2 is welded (joined) by ultrasonic vibration. In the following description, the plurality of sheet members 9 joined together by welding are referred to as “laminated sheet members”. In FIG. 1, reference numeral 90 is given to the laminated sheet member.

  FIG. 4 is a view showing a welding region 91 of the laminated sheet member 90. The welding area 91 is an area where a plurality of sheet members 9 are welded to each other. In FIG. The pattern indicated by the plurality of welding regions 91 is also referred to as a welding pattern. In the laminated sheet member 90, a region that substantially overlaps the non-recessed region 24 in the welding range A <b> 2 is a welding region 91. In the ultrasonic welding apparatus 1, the welding pattern in FIG. 4 is intermittently formed in the longitudinal direction with respect to the laminated sheet member 90. For example, in the manufacture of a pants-type disposable diaper, in the intermittent joining (side seal) of the sheet member in which the part corresponding to the front part of the disposable diaper is continuous and the sheet member in which the part corresponding to the rear part is continuous The laminated sheet member 90 is formed using the anvil 2 of FIG.

  In the example of FIG. 2, a gap is provided between the recess rows 23 adjacent to each other in the circumferential direction. That is, a linear region extending in the axial direction over the entire effective range of the outer peripheral surface 21 is included in the non-recessed region 24 in the welding range A2. In FIG. 2, the linear region is indicated by a two-dot chain line rectangle denoted by reference symbol L <b> 1. In the ultrasonic welding apparatus 1, when the tip surface 311 of the head 31 faces the linear region L <b> 1, most of the tip surface 311 is in contact with the non-recessed region 24 through the plurality of sheet members 9. In this case, since vibration energy is dispersed, the plurality of sheet members 9 are hardly welded. As a result, in the welding pattern shown in FIG. 4, there is a non-welding region corresponding to the linear region L <b> 1 between the welding regions 91 adjacent to each other in the vertical direction in FIG. 4 corresponding to the longitudinal direction of the sheet member 9. To do. Further, in the non-welding range A1, it can be considered that the linear region L1 is continuous in the circumferential direction, and the plurality of sheet members 9 are not welded for the same reason.

  Here, in each position in the circumferential direction on the outer peripheral surface 21 of the anvil 2, the ratio occupied by the non-recessed region 24 in the region facing the front end surface 311 of the head 31 via the plurality of sheet members 9 is expressed as “non-recessed region”. 24 "area ratio". The area ratio of the non-recessed area 24 can also be regarded as the area ratio of the outermost area of the outer peripheral surface 21. In an example of the ultrasonic welding apparatus 1, when the area ratio of the non-recessed region 24 is 85% or more, the plurality of sheet members 9 cannot be welded. Further, when the area ratio of the non-recessed region 24 is larger than 0% and 35% or less, the plurality of sheet members 9 can be welded.

  Actually, whether or not the plurality of sheet members 9 are welded depends on the magnitude and frequency of the voltage applied to the head 31 by the ultrasonic oscillator 32, and therefore, the lower limit of the area ratio at which welding is impossible, and The upper limit of the area ratio at which welding is possible varies depending on the input voltage to the head 31 and the like. Therefore, in the example of the ultrasonic welding apparatus 1, when the area ratio of the non-recessed region 24 is larger than 35% and smaller than 85%, whether or not welding is possible depends on the input voltage or the like. For example, when the input voltage is relatively high, the sheet member 9 can be welded when the area ratio of the non-recessed area 24 is 60% or less, and the area ratio of the non-recessed area 24 is 85%. When it is above, welding of a plurality of sheet members 9 is impossible. When the input voltage is relatively small, the plurality of sheet members 9 can be welded when the area ratio of the non-recessed area 24 is 35% or less, and the area ratio of the non-recessed area 24 is 60% or more. In some cases, welding of the plurality of sheet members 9 is impossible.

  In the non-welding range A <b> 1, the area ratio of the non-recessed region 24 is high, and thus the plurality of sheet members 9 cannot be welded. On the other hand, in the welding range A <b> 2, the area ratio of the non-recessed region 24 is low, so that a plurality of sheet members 9 can be welded. As described above, in the gaps between the adjacent recess rows 23 in each recess row group 230, that is, in the linear region L1, it is impossible to weld the plurality of sheet members 9, but the linear regions L1 in the circumferential direction cannot be welded. Since the width is slight, the linear region L1 is also included in the welding range A2 here. In the anvil 2, with the exception of the linear region L1 in the welding range A2, the area ratio of the non-recessed region 24 in the welding range A2 is lower than the area ratio of the non-recessed region 24 in the non-welding range A1.

  In the example described above, when the area ratio of the non-recessed region 24 is 85% or more, the plurality of sheet members 9 cannot be welded, the area ratio of the non-recessed region 24 is larger than 0%, and 35 When it is less than or equal to%, it is possible to weld a plurality of sheet members 9. In this case, in the outer peripheral surface 21 of the anvil 2, the circumferential range in which the area ratio of the non-recessed area 24 is 85% or more is included in the non-welding area A1, and the area ratio of the non-recessed area 24 is greater than 0%. And the range of the circumferential direction which is 35% or less can be said to be included in welding range A2.

  Here, as in Japanese Patent Application Laid-Open No. 2016-120275 (Patent Document 1), an anvil of a comparative example in which a plurality of protruding teeth and a plurality of suction holes are provided on the outer peripheral surface is assumed. In the anvil of the comparative example, protruding teeth and suction holes are alternately arranged in each row parallel to the central axis. In addition, regions where the protruding teeth (and suction holes) are provided and regions where the protruding teeth are not provided are alternately set in the circumferential direction. In the anvil of the comparative example, the head is separated from the anvil in the region where the protruding teeth are not provided. At this time, if the head is kept in the ON state, the head may be damaged. Therefore, the head is in the OFF state while facing the area. However, in the head, after switching from the OFF state to the ON state, a certain amount of time is required until welding becomes possible stably. Therefore, when the head is switched from the OFF state to the ON state when the head is opposed to the region where the protruding teeth are provided, the strength of the welding may be weakened at the portion of the sheet member that is welded immediately after the switching.

  On the other hand, in the ultrasonic welding apparatus 1 including the anvil 2 of FIG. 2, the non-welding range A1 in which the area ratio of the non-recessed region 24 that is the outermost region is relatively high on the outer peripheral surface 21 of the anvil 2 is Welding ranges A2 in which the area ratio of the recessed regions 24 is relatively low are alternately provided in the circumferential direction. Then, the head 31 passes through the welding range A2 and the non-welding range A1 while maintaining the ON state. Accordingly, the state in which the head 31 is in contact with the anvil 2 with the sheet member 9 interposed therebetween is always maintained to prevent the head 31 from being damaged, and the plurality of sheet members 9 can be stably welded in the welding range A2. Realized.

  Moreover, in the production of the anvil of the comparative example, in addition to the formation of the suction holes on the outer peripheral surface, complicated processing for attaching a plurality of protruding teeth to the outer peripheral surface is required. As a result, the manufacturing cost of the ultrasonic welding apparatus using the anvil of the comparative example increases. In addition, since the height of multiple protruding teeth (the distance between the top of the protruding teeth and the center axis of the anvil) varies, the head of the ultrasonic vibration unit can be positioned appropriately with respect to the anvil (stable welding is possible) The adjustment work to be arranged at the position) becomes extremely complicated.

  On the other hand, in the anvil 2 of the ultrasonic welding apparatus 1, the outer peripheral surface 21 is provided with a plurality of concave portions 22, and the non-recessed region 24 on the outer peripheral surface 21 is the outermost region separated by a certain distance from the central axis J1. . Then, the non-recessed region 24 comes into contact with the front end surface 311 of the head 31 through the plurality of sheet members 9 during welding. Since the anvil 2 having the above-described structure can be easily manufactured by drilling or grooving a cylindrical member, the manufacturing cost of the ultrasonic welding apparatus 1 can be reduced. Further, since the distance between the non-recessed region 24 that is the outermost region of the anvil 2 and the central axis J1 is constant over the entire circumference, the operation of adjusting the position of the head 31 with respect to the anvil 2 is also easy. It can be carried out.

  In the anvil of the comparative example, the distance between the edge of the suction hole and the central axis is smaller than the distance between the top of the protruding teeth and the central axis. That is, when the sheet member is welded, there is a difference in height between the top portion that contacts the head via the sheet member and the edge portion of the suction hole. As a result, for example, welding may be performed in a state where the sheet member is loose according to the above-described height difference, and the laminated sheet member may be wrinkled. On the other hand, in the anvil 2 of FIG. 2, the edge of the recess 22 that is a suction hole is included in the outermost region of the outer peripheral surface 21. Thereby, it can suppress or prevent that a wrinkle arises in a lamination sheet member. Furthermore, by providing the concave portion 22 in the welding range A2, it is possible to suppress loosening of the sheet member 9 during welding.

  FIG. 5 is a diagram illustrating another example of the anvil 2. In the anvil 2 of FIG. 5, similarly to the anvil 2 of FIG. 2, a non-welding range A1 in which the plurality of sheet members 9 are not welded on the outer peripheral surface 21 and a welding range A2 in which the plurality of sheet members 9 can be welded, They are provided alternately in the circumferential direction. In the welding range A2, two or more recesses 22 arranged at regular intervals in the axial direction are provided as the recess rows 23. In the example of FIG. 5, one recess row 23 forms the recess row group 230. In addition, auxiliary concave portions 22a extending in the axial direction are formed on both sides of the concave portion row 23 in the circumferential direction. In FIG. 5, the external shape of each auxiliary | assistant recessed part 22a is shown with the dashed-two dotted line. Each auxiliary recess 22 a is continuous with all the recesses 22 in the recess row 23 without sandwiching the non-recess region 24. In other words, in the part of the non-recessed region 24 existing between the two recessed parts 22 adjacent to each other in the recessed part row 23, the periphery thereof is surrounded by the two recessed parts 22 and the two auxiliary recessed parts 22 a, It is isolated from other parts of the recessed area 24. This part can be grasped as the convex part 25.

  In the welding range A2, the area ratio of the non-recessed area 24 is relatively small except for the position of the auxiliary recessed part 22a. In addition, at the position of the auxiliary recess 22a, the area ratio of the non-recess region 24 becomes 0, and the plurality of sheet members 9 are not welded, but like the gap (the linear region L1) between the recess rows 23 in FIG. For convenience of explanation, the auxiliary recess 22a is also included in the welding range A2. In addition, the width of the auxiliary recess 22a in the circumferential direction is slight, and the head 31 contacts the plurality of sheet members 9 in a tensioned state due to tension. Therefore, the head 31 is not damaged when passing through the auxiliary recess 22a. .

  In the non-welding range A1, several concave portions 22b are provided. These recesses 22b are suction holes connected to a decompression mechanism. In the example of FIG. 5, the four recesses 22b are arranged in the axial direction with a sufficient gap. The area ratio of the non-recessed region 24 in the non-welding range A1 is sufficiently higher than the area ratio of the non-recessed region 24 in the welding range A2, and the plurality of sheet members 9 cannot be welded in the non-welding range A1.

  Also in the ultrasonic welding apparatus 1 including the anvil 2 in FIG. 5, the head 31 passes through the non-welding range A1 and the welding range A2 including the outermost region while maintaining the ON state. Thereby, welding of a plurality of sheet members 9 can be performed stably. In addition, in the welding range A2, the periphery of a part (the convex portion 25) of the non-recessed region 24 that is the outermost region is surrounded by the concave portions 22 and 22a. Thereby, in the lamination sheet member 90, the pattern of the clear welding area | region corresponding to the surface shape (shape of the surface contained in an outermost area | region) of the convex part 25 can be formed. Further, the non-recessed region 24 excluding the recessed portions 22, 22a, 22b on the outer peripheral surface 21 is the outermost region separated from the central axis J1 by a certain distance. Thereby, the anvil 2 can be produced easily and the manufacturing cost of the ultrasonic welding apparatus 1 can be reduced. Moreover, the operation | work which adjusts the position of the head 31 with respect to the anvil 2 can also be performed easily.

  In the anvil 2, the sheet member 9 can be appropriately held by suction of the sheet member 9 by the recess 22b provided in the non-welding range A1. Furthermore, when the edge of the recess 22b is included in the outermost region of the outer peripheral surface 21, the occurrence of wrinkles in the laminated sheet member 90 can be suppressed or prevented. In addition, the width | variety of the sheet | seat member 9 may be made larger than the length of the auxiliary | assistant recessed part 22a in an axial direction. In this case, both edge portions of the sheet member 9 along the longitudinal direction are in contact with both outer portions of the auxiliary recess 22a in the axial direction on the outer peripheral surface 21, so that the vicinity of both edge portions of the sheet member 9 is at the time of welding. Sag is suppressed.

  The recess 22b, which is a suction hole, can also be provided in the welding range A2. In FIG. 6, the concave portion 22 b is provided in the convex portion 25 existing between two concave portions 22 adjacent to each other in the concave portion row 23. Also in this case, the edge of the recess 22 b is included in the outermost region of the outer peripheral surface 21. In the anvil 2 of FIG. 6, the recess 22b provided in the welding range A2 holds the sheet member 9 during welding. As described above, the presence of the suction hole in the welding range A2 can suppress the slackness of the sheet member 9 during welding.

  The ultrasonic welding apparatus 1 can be variously modified.

  In the anvil 2, the shape of the recess 22 may be changed as appropriate. As described above, since the shape of the welding region in the laminated sheet member 90 depends on the shape of the recess 22, various shapes of the welding region can be realized by changing the shape of the recess 22. Of course, the number, size, and arrangement of the recesses 22 may be variously changed. Further, in the anvil 2, the suction hole may be omitted, and the sheet member 9 may be held on the outer peripheral surface of the anvil 2 using only the tension acting on the sheet member 9.

  Depending on the manufacturing method of the anvil 2, a large number of small convex portions are formed in the axial direction and the circumferential direction in the welding range A2, and a large convex portion that extends in both the axial direction and the circumferential direction is formed in the non-welding range A1. May be. Also in this case, since the height of these convex portions is approximately constant, the ON state of the head 31 can be maintained, and the sheet member 9 can be stably welded in the welding range A2. As described above, in the ultrasonic welding apparatus 1, it is possible to use various anvils 2 whose outer peripheral surface 21 has irregularities.

  On the outer peripheral surface 21 of the anvil 2, only one non-welding range A1 and one welding range A2 may be provided. Also in this case, it can be understood that the non-welding range A1 and the welding range A2 are alternately provided in the circumferential direction on the outer peripheral surface 21.

  In the above embodiment, two sheet members 9 are welded, but three or more sheet members 9 may be welded to each other.

  The ultrasonic welding apparatus 1 may be used in addition to manufacturing absorbent articles. Moreover, the sheet | seat member 9 may be formed with sheets other than a nonwoven fabric.

  The configurations in the above-described embodiments and modifications may be combined as appropriate as long as they do not contradict each other.

DESCRIPTION OF SYMBOLS 1 Ultrasonic welding apparatus 2 Anvil 3 Ultrasonic vibration part 9 Sheet | seat member 21 Peripheral surface 22,22a, 22b Concave part 24 Non-recessed area | region 25 Convex part 31 Head 311 Tip surface A1 Non-welding range A2 Welding range J1 Central axis

Claims (5)

An ultrasonic welding apparatus,
An anvil having a cylindrical outer peripheral surface centered on the central axis and rotating about the central axis;
An ultrasonic vibration section for welding a plurality of sheet members passing between the head and the outer peripheral surface, a tip surface extending in a direction parallel to the central axis having a head facing the outer peripheral surface of the anvil; ,
With
The outer peripheral surface of the anvil has irregularities, and an outermost region separated from the central axis by a certain distance on the outer peripheral surface is connected to the front end surface of the head via the plurality of sheet members during welding. contact,
In the outer peripheral surface, non-welding ranges in which the plurality of sheet members are not welded and welding ranges in which the plurality of sheet members can be welded are alternately provided in the circumferential direction,
At each position in the circumferential direction on the outer peripheral surface, the ratio of the outermost region to the area ratio of the outermost region in the region facing the tip surface through the plurality of sheet members is the welding range. The area ratio of the outermost region in is lower than the area ratio of the outermost region in the non-welding range,
The ultrasonic welding apparatus, wherein the head passes through the welding range and the non-welding range while maintaining an ON state. The ultrasonic welding apparatus according to claim 1,
In the welding range, an ultrasonic welding apparatus characterized in that a part of the outermost region is surrounded by a recess. The ultrasonic welding apparatus according to claim 1 or 2,
In the outer peripheral surface of the anvil, a suction hole is formed to hold the sheet member during welding,
An ultrasonic welding apparatus, wherein an edge of the suction hole is included in the outermost region. The ultrasonic welding apparatus according to claim 3,
The ultrasonic welding apparatus, wherein the suction hole exists in the welding range. The ultrasonic welding apparatus according to any one of claims 1 to 4, wherein
In the outer peripheral surface of the anvil, the circumferential range in which the area ratio of the outermost region is 85% or more is included in the non-welding range, the area ratio of the outermost region is greater than 0%, and The ultrasonic welding apparatus is characterized in that the circumferential range of 35% or less is included in the welding range.

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