JP2024021245A - cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve removal accuracy of a trim part cut from a sheet-shaped material.

SOLUTION: A cutting device comprises a cutting mechanism comprising: a cutter roll on which a cutter blade is formed on an outer peripheral surface thereof; and an anvil roll for receiving the cutter blade, the cutting mechanism cutting a sheet-shaped material carried in a space between the cutter roll and the anvil roll, into a product and a trim other than the product. The cutting device comprises: a suction mechanism which is adjacent to an extension position of any one of the cutter roll and the anvil roll of the cutting mechanism, with respect to a travel direction where the sheet-shaped material is transported, and has a suction duct for sucking the trim; and a discharge mechanism which is provided so as to face the suction mechanism sandwiching the sheet-shaped material therebetween, and has a discharge part for discharging a gas toward an open suction hole of the suction duct.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present disclosure relates to a cutting device for sheet-like materials related to absorbent articles.

Conventionally, absorbent articles such as disposable diapers are manufactured by combining a plurality of types of sheet-like materials as constituent members. For example, a ventral part that comes into contact with the abdomen side of the wearer, a dorsal part that comes into contact with the back side, a crotch part that includes an absorbent material and comes into contact with the crotch area, and a pair of legs that both legs pass through. A plurality of types of sheet-like materials constituting each of the circumferential openings and the like are appropriately combined and processed to produce an absorbent article such as a paper diaper. In manufacturing absorbent articles, sheet-like materials corresponding to each of the above-mentioned constituent parts or a belt-like body in which multiple types of sheet-like materials are laminated are cut along the external shape (product shape) of the absorbent article. Includes processes.

For example, as shown in Patent Document 1, a rotary cutter device is known as a device for forming a leg opening. A rotary cutter device typically includes a cutter roll having a protruding cutter blade on its outer circumferential surface, and an anvil roll having a planar receiving portion disposed opposite to the outer circumference of the cutter roll to receive the cutter blade. It is composed of: By passing an object to be cut, such as a sheet material, between these two rolls, a part of the object to be cut is cut off, and the product and the scraps other than the product (absorbent article) (hereinafter also referred to as trim portion) are removed. ) is generated. Note that the generated trim portion is removed and collected from the line on which the products whose external shapes have been adjusted are conveyed.

JP2010-227544A

Incidentally, the trim portion generated when forming the leg opening may be cut into a curved shape with a predetermined width in the CD direction orthogonal to the conveyance direction. When a sheet-like material or the like is cut into the curved shape, it may be difficult for the trim portion to separate from the product portion whose outer shape has been adjusted. If this happens, the trim portion will flow to downstream processing along with the product portion. In order to remove the trim portions that are unnecessary for the manufacturing process, it is necessary, for example, to stop the manufacturing line and manually remove the trim portions, resulting in a decrease in productivity. An object of the present disclosure is to improve the removal accuracy of trim portions cut from sheet material.

A cutting device according to one aspect of the present disclosure includes a cutter roll having a cutter blade formed on the outer circumferential surface and an anvil roll that receives the cutter blade, and a sheet material carried between the cutter roll and the anvil roll. A cutting device equipped with a cutting mechanism that cuts a product into a product and a trim other than the product, the cutting device having a cutter roll or an anvil roll of the cutting mechanism at an extending position with respect to the traveling direction in which the sheet material is conveyed. A suction mechanism that is provided adjacently and has a suction duct that suctions the trim, and a discharge section that is provided opposite to the suction mechanism with the sheet material in between and that discharges gas toward the suction port opened by the suction duct. and a discharge mechanism.

According to the present disclosure, it is possible to improve the accuracy of removing a trim portion cut from a sheet-like material.

FIG. 1 is a perspective view illustrating a schematic configuration of a cutting device according to a first embodiment. FIG. 2 is a diagram illustrating a sheet material to be cut by the cutting device according to the first embodiment. FIG. 3 is a diagram illustrating the mechanical configuration of the rotary cutter device. FIG. 4 is a diagram illustrating the discharge of gas to the trim portion by the discharge mechanism. FIG. 5 is a diagram illustrating suction of a trim portion in a comparative embodiment. FIG. 6 is a diagram illustrating suction of the trim portion in the first embodiment.

<Embodiment 1>
EMBODIMENT OF THE INVENTION Below, the cutting device based on embodiment of this invention is demonstrated with reference to drawings. Note that the configurations of the following embodiments are merely examples, and the present invention is not limited to the configurations of these embodiments.

FIG. 1 is a perspective view for explaining the schematic configuration of a cutting device 1 according to the present embodiment. The cutting device 1 according to the present embodiment is a processing equipment that cuts a sheet-like material 2 along a product shape in the process of manufacturing products such as absorbent articles such as paper diapers. The sheet-like material 2 includes a single type of sheet-like base material constituting an absorbent article such as a disposable diaper, a band-like body formed by laminating a combination of multiple types of sheet-like base materials, and a material that absorbs and retains excreted liquid such as urine. This includes a single type of sheet-like substrate or strip-like body combined with an absorbent body. By the cutting device 1, a pair of leg openings are formed in the sheet-like material 2, which is the object to be cut, for example, through which both legs of the wearer are passed. The sheet-like material 2 with the leg openings formed therein is transported to a downstream process for manufacturing disposable diapers and the like as a product, and the cut portion other than the product cut from the sheet-like material 2 is trimmed into a curved shape. As parts 2A, 2B, the products are removed from the line in which they are conveyed. Hereinafter, the conveyance direction of the line along which the sheet material 2 is conveyed according to the manufacturing process is also referred to as "MD direction" or "progressing direction", and the direction orthogonal to the conveyance direction within the same plane including the MD direction is referred to as "MD direction" or "progressing direction". Also referred to as "CD direction". In the continuous sheet material 2 that is conveyed along the MD direction, the CD direction is the lateral direction or the width direction of the sheet material 2.

As shown in FIG. 1, the cutting device 1 according to the present embodiment includes a rotary cutter device 10, a discharge mechanism 20, and a trim suction mechanism 30. The discharge mechanism 20 and the trim suction mechanism 30 are arranged on the downstream process side of the rotary cutter device 10 where the continuous sheet material 2 conveyed along the MD direction is processed. In this embodiment, the rotary cutter device 10 corresponds to an example of a "cutting mechanism".

The rotary cutter device 10 punches out a part of the sheet-like material 2 that is conveyed in the conveyance direction (MD direction) from the upstream side to the downstream side, cuts out a part, makes a cut in the sheet-like material, and cuts into product units. This is a device for dividing, etc. The rotary cutter device 10 includes a cylindrical cutter roll 11 and an anvil roll 12 that are paired with each other with a shaft core 111 and a shaft core 121 as central axes. As will be described later, the cutter roll 11 is provided with a protruding cutter blade along the cutting shape of the absorbent article on the outer peripheral surface thereof, and the outer peripheral surface of the anvil roll 12 disposed opposite to the cutter roll is provided with the cutter blade. It has a planar receiving part for receiving the material.

The cutter roll 11 is rotated in the direction of a solid line arrow RCa about an axis 111 by a drive mechanism such as a gear or a motor for rotating the cutter roll. Similarly, the anvil roll 12 is rotated about the axis 121 in the direction of the solid arrow RCb by a drive mechanism such as a gear or a motor for rotating the anvil roll. Cutter roll 11 and anvil roll 12 rotate synchronously.

The sheet material 2 conveyed from the upstream side is sandwiched between the outer circumferential surface of the cutter roll 11 and the outer circumferential surface of the anvil roll 12, passes through the rotary cutter device 10, and is conveyed to the downstream side. A pair of leg openings as a product are formed in a predetermined area of the sheet material 2 pressed between the cutter blade provided on the outer peripheral surface of the cutter roll 11 and the receiving part of the anvil roll 12. , the trim portions 2A and 2B other than the product are cut. The trim portions 2A and 2B are curved, non-rectangular, and have a predetermined width in the CD direction.

The discharge mechanism 20 is a discharge mechanism that discharges gas such as air onto the surface (vertically upward side) of the sheet material 2 that has passed through the rotary cutter device 10. The discharge mechanism 20 includes a compressor 21 that pumps gas such as air, and a plurality of discharge parts (22a to 22f) connected to the compressor. Hereinafter, the discharge portions (22a to 22f) are also collectively referred to as the “discharge portion 22”. The discharge part 22 is, for example, a metal pipe (metal tube) such as a copper pipe for discharging gas such as air fed from the compressor 21 at a predetermined pressure. By configuring the discharge section 22 as a metal tube, gas pumped under high pressure can be discharged.

A plurality of discharge units 22 are provided along the CD direction so as to spray the gas, etc., pressure-fed from the compressor 21 onto the trim parts 2A and 2B cut by the rotary cutter device 10 from the surface side. In the form shown in FIG. 1, three discharge portions 22a, 22b, 22c for discharging gas etc. to the trim portion 2A, and three discharge portions 22d, 22e for discharging gas etc. to the trim portion 2B, 22f is illustrated. In addition, the discharge part 22 which discharges gas etc. from the surface side to each of the trim parts 2A and 2B may be a single unit, or two or more may be sufficient as it. The discharge mechanism 20 can appropriately arrange the discharge portions 22 depending on the shape of the trim portion to be cut by the rotary cutter device 10 and the number of trim portions to be cut from the sheet material 2.

The trim suction mechanism 30 is a collection mechanism that sucks and collects the trim portions 2A and 2B cut by the rotary cutter device 10. The trim suction mechanism 30 includes suction ducts 31 and 32 connected to a suction machine (for example, a compressor type) that suctions gas such as air. The suction ducts 31 and 32 are provided, for example, on the anvil roll side of the rotary cutter device 10. The sheet-like material 2 is charged by the anvil roll 12 with a long contact time and is urged in the direction in which the anvil roll is located. Therefore, by providing the suction ducts 31 and 32 on the anvil roll side, the suction force to the trim portions 2A and 2B can be increased.

In the trim suction mechanism 30, each of the suction ducts 31 and 32 has a substantially rectangular suction port 31a and 32a that opens facing the back surface (vertically downward side) of the sheet material 2 that has passed through the rotary cutter device 10. have However, the opening shape of the suction ports 31a and 32a is not limited to a rectangular shape. The opening shape of the suction ports 31a and 32a may be substantially elliptical, or the suction ports 31a and 32a may be formed to open integrally. The embodiment shown in FIG. 1 includes a suction duct 31 for suctioning the trim portion 2A and a suction duct 32 for suctioning the trim portion 2B. Each of the suction ducts 31 and 32 includes a suction path that tapers from the position where the rotary cutter device 10 is disposed toward the downstream side where the sheet material 2 is conveyed.

The discharge parts 22a to 22c of the discharge mechanism 20 are arranged to sandwich the sheet material 2 that has passed through the rotary cutter device 10 and to face the suction port 31a of the suction duct 31 included in the trim suction mechanism 30. Similarly, the discharge portions 22d to 22f are arranged to sandwich the sheet material 2 that has passed through the rotary cutter device 10 and to face the suction port 32a of the suction duct 32. In the discharge portions 22a to 22f according to the present embodiment, the ends from which air and the like are discharged are bent into a substantially doglegged shape toward the downstream side in the conveyance direction. For example, when the inclination angle of the suction ducts 31 and 32 with respect to the horizontal direction is 60 degrees, the ends of the discharge parts 22a to 22f are bent to have approximately the same inclination angle as the inclination angle of the absorption duct. . That is, in this embodiment, the suction direction by the suction ducts 31 and 32 and the discharge direction of the gas discharged from each discharge section are configured to be substantially on the same line.

The discharge parts 22a to 22c of the discharge mechanism 20 pass through the rotary cutter device 10 and are applied to the trim portion 2A cut into a predetermined shape from the sheet-like material 2 from the upper surface side to the suction port 31a side where the suction duct 31 opens. Discharge the gas that was pumped towards it. Similarly, the discharge sections 22d to 22f discharge gas that is force-fed from the upper surface side toward the suction port 31a side where the suction duct 31 opens, to the trim portion 2B cut into a predetermined shape from the sheet material 2. do. Then, the trim suction mechanism 30 moves the trim portions 2A and 2B, which are pressed from the upper surface side toward the suction ports 31a and 32b, into the suction ducts 31 and 32, respectively, by the pressure of the gas discharged from the discharge portions (22a to 22f). suction through. In this way, each of the cut trim parts 2A and 2B is separated from the product by the pressing force of the gas discharged from the plurality of discharge parts 22 and the suction force sucked through the suction ports 31a and 32a, and the trim parts 2A and 2B are separated from the product. It can be guided into the ducts 31, 32. According to the cutting device 1 according to the present embodiment, it is possible to improve the reliability of suctioning each of the trim portions 2A and 2B cut from the sheet material 2 by the rotary cutter device 10 into the suction ducts 31 and 32. This can prevent the trim portions 2A, 2B from flowing into the downstream process together with the product portion. According to this embodiment, the removal precision of the trim portions 2A and 2B cut from the sheet material 2 can be improved.

FIG. 2 is a diagram illustrating a sheet material 2 to be cut by the cutting device 1 according to the present embodiment. In FIG. 2, a form of a sheet-like material 2 constituting a so-called open type diaper is illustrated, in which a ventral part 2F and a dorsal part 2E are fixed using a hook-and-loop fastener or the like when worn. Examples of such sheet-like materials 2 include nonwoven fabrics with a single-layer or multilayer structure, perforated films, liquid-impermeable or water-repellent resin films, and laminates of resin films and nonwoven fabrics. However, the sheet material 2 is not limited to these members. Examples include aggregates of fibers such as nonwoven fabrics and pulp fibers, absorbent cores in which water-absorbing polymer particles are held in the aggregates, and absorbent cores covered with core wrap sheets made of water-permeable thin paper or nonwoven fabrics. An absorbent body made of various known polymer sheets or the like may be included. In addition, the sheet-like material 2 includes an elastic member such as a stretchable rubber thread, and a leak-preventing member made of a nonwoven fabric called three-dimensional gathers to prevent side leakage of excretory fluids such as urine. You can.

In the form shown in FIG. 2, the sheet-like material 2 is carried into the rotary cutter device 10 as a continuous body with the direction corresponding to the longitudinal direction of the product diaper aligned with the conveyance direction (MD direction). Both end edges in the CD direction of the sheet-like material 2 carried in are cut by the rotary cutter device 10, and a pair of leg openings (2C, 2D) having a curved shape as a product are formed on the ventral side 2F and the dorsal side. 2E. Then, the cut ends other than the product cut from the sheet-like material 2 are separated into trim parts 2A and 2B having a curved shape.

FIG. 3 is a diagram illustrating the mechanical configuration of the rotary cutter device 10. As shown in FIG. FIG. 3 illustrates a front view of the rotary cutter device 10 viewed from the downstream side in the conveyance direction in which the sheet material 2 is conveyed. As shown in FIG. 3, on the outer peripheral surface 11a of the cutter roll 11 constituting the rotary cutter device 10, a pair of cutter blades for forming a pair of leg openings (2C, 2D) in the sheet material 2 is provided. 11bL and 11bR are provided. Further, on the outer circumferential surface 12a of the anvil roll 12, a planar receiving portion is formed to receive each of the cutter blades 11bL and 11bR. Each of the cutter blades 11bL and 11bR has a substantially C-shaped outer shape that follows the cutting shape of the absorbent article, and protrudes from the outer peripheral surface 11a of the cutter roll 11. The pair of cutter blades 11bL and 11bR are arranged so that the portion without a cutting edge faces outward in the CD direction and is located at the edge of the sheet material 2 in the CD direction. In the sheet-like material 2 sandwiched between the cutter roll 11 and the anvil roll 12, the part that is cut by the pressure of the cutter blade 11bL and faces the substantially C-shaped inner circumference side region 11cL becomes the trim part 2A. . Similarly, the portion of the sheet-like material 2 that is cut by the pressure of the cutter blade 11bR and faces the substantially C-shaped inner peripheral region 11cR becomes the trim portion 2B. Note that a pair of leg openings (2C, 2D) having a curved shape are formed in the sheet material 2 from which the trim portions 2A, 2B have been cut.

FIG. 4 is a diagram illustrating the discharge of gas to the trim portion 2A by the discharge mechanism 20. In addition, in FIG. 4, the trim portion 2A and the discharge of air, etc., pressure-fed by the compressor 21 to the trim portion 2A using the discharge portions 22a to 22c will be explained. FIG. 4(a) is a diagram illustrating how the single discharge portion 22b discharges the air, etc., which is force-fed to the trim portion 2A, and FIG. , 22c is a diagram illustrating how air, etc., which has been pressure-fed to the trim portion 2A, is discharged by the trim portion 2A.

As shown in FIG. 4(a), the trim portion 2A cut from the sheet material 2 by the rotary cutter device 10 has a curved shape and a predetermined width in the CD direction. As already explained, the discharge part 22 (for example, the discharge part 22b) provided in the discharge mechanism 20 connects the suction duct 31 provided in the trim suction mechanism 30 from the upper surface side of the trim portion 2A, as shown by the solid arrow 23. Gas such as air is discharged in the direction of the suction port 31a. Due to the pressing force of the air discharged through the discharge portion 22, the trim portion 2A cut from the sheet material 2 is pressed in the direction in which the suction port 31a opens, and is sucked into the suction duct 31. Note that the sheet material 2 passing through the rotary cutter device 10 is conveyed to the downstream side while the trim portion 2A is partially cut off. Therefore, in the trim portion 2A, for example, a range indicated by the rectangular region 2G receives the pressing force of the discharged air or the like.

When the sheet-like material 2 is composed of a combination of multiple types of sheet-like base materials, the trim portion 2A cut by the rotary cutter device 10 includes a joint portion 2H between different types of sheet-like base materials. There is. Since the joint part 2H is relatively hard compared to parts other than the joint part 2H, the pressing force of the gas discharged from a single discharge part 22 pushes the trim part 2A including the joint part 2H into the suction port 31a. It may not be possible to push it in enough in the direction that it opens. Further, in the trim portion 2A, there may be a disconnection between the product sheet material 2 and the portion including the joint portion 2H.

On the other hand, as shown in FIG. 4(b), when three discharge portions 22a, 22b, and 22c are provided along the CD direction, the trim portion 2A has a curved shape and has a predetermined width in the CD direction. It is possible to discharge gas such as air that has been force-fed to the entire area. For example, the discharge portion 22a provided on the edge side in the CD direction can press the area range of the trim portion 2A indicated by the rectangular area 2Ga from the upper surface side in the direction of the solid line arrow 23. Further, the discharge portion 22b can press a region located approximately at the center of the trim portion 2A indicated by the rectangular region 2Gb in the direction of the solid line arrow 23 from the upper surface side. Then, the discharge portion 22c can press the area range at the end of the trim portion 2A indicated by the rectangular area 2Gc adjacent to the rectangular area 2Gb in the direction of the solid line arrow 23 from the upper surface side. In this way, the discharge portions 22a, 22b, and 22c provided along the CD direction integrally discharge pressurized gas such as air to the trim portion 2A having a predetermined width in the CD direction. It is possible to strengthen the pressing force and press the trim portion 2A in the direction in which the suction port 31a opens. Even if the trim portion 2A includes the joint portion 2H, the trim portion can be moved by the pressing force of the gas discharged integrally from the three discharge portions 22a, 22b, and 22c provided along the CD direction. It becomes possible to press the entire body and push it in the direction in which the suction port 31a opens. In addition, even if there is a disconnection between the trim part 2A and the manufactured sheet material 2 at the part including the joint part 2H, the discharge parts 22a, 22b, and 22c can be integrally discharged. It is expected that the trim portion will be separated from the product due to the pressing force of the gas.

Note that the discharge mechanism 20 may be used only for the trim portion 2A that does not include the joint portion 2H, for example, for the discharge portion 22b where the area pressed by the discharged gas is relatively large. . By using the single discharge part 22b, it is possible to prevent the sheet material 2 in which the pair of leg openings (2C, 2D) are formed from the rotary cutter device 10 from being kinked. Then, the discharge mechanism 20 presses the entire region of the trim portion 2A having a width in the CD direction using the three discharge portions 22a, 22b, and 22c only when the trim portion 2A includes the joint portion 2H. You can do it like this.

Further, the discharge mechanism 20 discharges the pressure-fed gas such as air only when the trim portions 2A, 2B are present between each discharge portion and the suction ports 31a, 32a of the suction ducts 31, 32. You can also do this. Thereby, it is possible to prevent the sheet-like material 2 formed with the pair of leg openings (2C, 2D) and transported downstream from twisting or the like due to the pressing force of the discharged gas.

Furthermore, the discharge mechanism 20 determines the amount of gas discharged from each discharge portion when the joint portion 2H passes through the suction ports 31a and 32a, and the amount of gas discharged from each discharge portion when a portion other than the joint portion 2H passes. The amount of gas discharged may be changed. It is possible to suppress the discharge amount of gas etc. discharged from the discharge section 22 and to perform control according to the hardness and thickness of the target region. Moreover, the discharge mechanism 20 may be provided with a discharge part that discharges gas such as air that is pressure-fed only when the joint part 2H passes through the suction ports 31a and 32a.

Next, suction of the trim portions 2A and 2B will be explained using FIGS. 5 to 6. FIG. 5 is a diagram illustrating suction of the trim portions 2A and 2B in a comparative embodiment. FIG. 5 is a side view showing how the trim portions 2A and 2B cut by the rotary cutter device 10 are sucked and collected. The sheet-like material 2 carried into the rotary cutter device 10 from the upstream side is cut into a product and trim portions 2A and 2B other than the product by a pair of cutter rolls 11 and anvil roll 12 that rotate in the RC direction, respectively. In the comparative embodiment, the discharge section 22 discharges gas such as air that is pressure-fed to the trim portions 2A and 2B cut from the upper side in the vertical direction as shown by the arrow 23. The trim portions 2A and 2B are moved toward the suction ports 31a and 32a of the suction ducts 31 and 32 provided in the trim suction mechanism 30 provided on the lower side due to the pressing force of the gas discharged from the upper side in the vertical direction to the lower side. Being pushed. As described above, the suction ducts 31 and 32 of the trim suction mechanism 30 are tapered toward the downstream side where the manufactured sheet material 2 is conveyed.

As shown in FIG. 5, the discharge direction (arrow 23) of the gas discharged from the discharge part 22 is different from the suction direction (arrow 33) by the suction ducts 31 and 32. Therefore, the pressing force of the gas discharged from the discharge part 22 and the suction force by the suction ducts 31 and 32 on the trim parts 2A and 2B do not function effectively, and the trim parts 2A and 2B There were cases where the object was blown away from the original position. For example, as shown in FIG. 5, a portion of the trim parts 2A, 2B is caught on the housing surface of the trim suction mechanism 30 where the suction ports 31a, 32a are opened, and the trim parts 2A, 2B are sucked by the suction ducts 31, 32. There was a situation where this was being hindered.

FIG. 6 is a diagram illustrating suction of the trim portions 2A and 2B in this embodiment. FIG. 6 is a side view showing how the trim portions 2A and 2B cut by the rotary cutter device 10 are sucked and collected. As shown in FIG. 6, the discharge portion 22 according to the present embodiment has an end portion that is bent to have substantially the same angle as the inclination angle of the suction ducts 31 and 32. For example, the end of the discharge section 22 is bent in a substantially dogleg shape toward the downstream side in the conveyance direction so as to have substantially the same angle as the inclination angle of the suction ducts 31 and 32 with respect to the horizontal direction. In this embodiment, the suction direction by the suction ducts 31 and 32 and the discharge direction of gas discharged from each discharge portion are configured to be substantially on the same line. Therefore, the pressing force of the gas discharged from the discharge portion 22 to the trim portions 2A, 2B and the suction force by the suction ducts 31, 32 can be made to function effectively.

In FIG. 6, the sheet material 2 carried into the rotary cutter device 10 from the upstream side is separated into products and trim parts 2A and 2B by a pair of cutter rolls 11 and anvil rolls 12 that rotate in the RC direction, respectively. be cut. Then, the discharge section 22 discharges the pressure-fed gas such as air from the upper side of the cut trim portions 2A, 2B toward the suction direction 33 by the suction ducts 31, 32, as shown by the arrow 23. . The trim portions 2A and 2B are pressed in the direction of the suction ports 31a and 32a of the suction ducts 31 and 32 included in the trim suction mechanism 30, receive suction force from the suction ducts 31 and 32, and smoothly move into the suction ducts. It gets sucked in. The trim portions 2A, 2B are not blown away to positions shifted from the suction ports 31a, 32a due to the difference between the discharge direction of the gas discharged from the discharge portion 22 and the suction direction by the suction ducts 31, 32.

As described above, the cutting device 1 according to the present embodiment has a discharge section 22 that discharges gas such as air under pressure to the trim portions 2A and 2B cut by the rotary cutter device 10. A mechanism 20 can be provided. Further, the cutting device 1 can include a trim suction mechanism 30 having suction ducts 31 and 32 that suck the trim portions 2A and 2B cut by the rotary cutter device 10 from below. The cutting device 1 according to the present embodiment is configured such that the suction direction by the suction ducts 31 and 32 and the discharge direction of the gas discharged from the discharge section 22 are substantially on the same line. As a result, in the cutting device 1, it becomes possible to effectively function the pressing force of the gas discharged from the discharge part 22 to the trim parts 2A, 2B and the suction force by the suction ducts 31, 32. 2A and 2B can be smoothly drawn into the suction duct. According to this embodiment, it is possible to improve the reliability of recovering the trim parts 2A and 2B cut by the rotary cutter device 10, and it is possible to prevent the trim parts from flowing to a downstream process together with the product. According to the cutting device 1 according to the present embodiment, the precision in removing the trim portions 2A and 2B cut from the sheet material 2 can be improved.

(Trim separation evaluation test)
Regarding the cutting device 1 according to the present embodiment, the following evaluation test was conducted regarding separation of the trim portions 2A and 2B (hereinafter also simply referred to as "trim portion 2AB"). The evaluation test was conducted under four pressures of gas such as air blown from the discharge part 22 to the trim portion 2AB: 0.3 Mpa, 0.5 Mpa, 0.7 Mpa, and 0.8 Mpa or higher. In addition, the pipe diameter of the discharge part 22 was set to be a constant diameter (for example, 4 mm), and the conveyance speed of the sheet-shaped material 2 was set to be a constant speed (for example, 120 m/min). As already explained, the conveyance speed of the sheet material 2 and the rotational speed of the rotary cutter device 10 are synchronized. The cutter blades 11bL and 11bR provided on the cutter roll 11 of the rotary cutter device 10 and the anvil roll 12 are made of high-speed steel, and the trim portion 2AB to be cut has, for example, a basis weight of the sheet material 2 of 28 gsm. .

(Braying pressure)
The test results are as follows.
When the pressure of the gas pumped from the discharge part 22 was 0.3 Mpa, the sheet-like material 2 carried out from the rotary cutter device 10 and the cut trim portion 2AB were not separated. Next, when the pressure of the gas fed from the discharge part 22 was set to 0.5 MPa and the gas was discharged to the trim portion 2AB, a disconnection failure occurred once during continuous operation for about one hour. Further, when the pressure was increased to 0.7 MPa, the pressure of the gas pumped from the discharge part 22 was increased, and no defective separation between the sheet material 2 and the trim portion 2AB occurred during continuous operation for about 1 hour. Note that a pressure of 0.8 MPa or higher exceeds the pressure resistance of general piping such as polyurethane tubes. In this embodiment formed of a metal pipe such as a copper pipe, gas can be discharged to the trim portion 2AB at a pressure of 0.8 MPa or higher; has occurred.

From the above evaluation results, the pressure of the gas discharged from the discharge portion 22 to the trim portions 2A, 2B can range from 0.5 MPa or more to less than 0.8 MPa. However, it has been found that the gas pressure during operation is preferably in the range of 0.5 Mpa or more to 0.7 Mpa or less.

(Pipe diameter)
Furthermore, regarding the cutting device 1 according to the present embodiment, the following evaluation test was conducted on cutting off the trim portion 2 by increasing and decreasing the tube diameter (mm) of the discharge portion 22. Three types of tubes with diameters of 2 mm, 4 mm, and 6 mm were used as evaluation targets. Note that the pressure of the gas blown from the discharge part 22 was set to a constant value of 0.5 MPa, and the evaluation test was the same as the above-mentioned evaluation test except for the pressure.

In the case where the pipe diameter of the discharge part 22 was Φ2 mm, sheet tearing occurred twice in the conveyed sheet-like material 2 during continuous operation for about 1 hour. When the pipe diameter of the discharge portion 22 was Φ4 mm, no sheet tearing occurred during continuous operation for about one hour. In addition, when the pipe diameter of the discharge part 22 was set to Φ6 mm, a failure in separating the trim portion 2AB from the sheet-like material 2 occurred once during continuous operation for about one hour.

From the above evaluation results, it is preferable that the applicable range of the pipe diameter of the metal pipe constituting the discharge part 22 is more than 2 mm in diameter and 6 mm or less.

Furthermore, regarding the cutting device 1 according to the present embodiment, an evaluation test was conducted regarding cutting off of the trim portion 2 by increasing and decreasing the conveyance speed of the sheet-like material 2. The sheet material 2 was transported at five speeds: 90 m/min, 120 m/min, 155 m/min, 200 m/min, and 250 m/min. The pressure of the gas such as air blown from the discharge part 22 to the trim portion 2AB was 0.5 MPa, the pipe diameter was Φ4 mm, and other conditions were the same as in the above test.

In an evaluation test in which the conveyance speed was increased or decreased, when the conveyance speed was 90 m/min, no disconnection failure occurred during continuous operation for about 1 hour. Even when the tube diameter was set to Φ6 mm as an experiment, no disconnection failure occurred. In addition, when the conveyance speed is in the range of 120 m/min or more, the pressure of the gas discharged from the discharge part 22 to the trim part 2AB is in the range of 0.5 Mpa or more and less than 0.8 Mpa, and the pipe diameter is more than 2 mm in diameter and less than 6 mm. I was able to drive well within this range. As a result, the transport speed of the sheet material 2 can be in a range exceeding 90 m/min, preferably in a range of 120 m/min or more.

Regarding the cutting device 1 according to the present embodiment, the trim portion 2AB to be cut is a member made of two polypropylene nonwoven fabrics bonded together with hot melt (HM), and the basis weight of the sheet material 2 is 28 gsm, 30 gsm, 35 gsm, 40 gsm. A similar evaluation test was conducted. As a result, in the range where the conveyance speed of the sheet material 2 exceeds 90 m/min, the pressure of the gas discharged to the trim parts 2A and 2B is in the range of 0.5 Mpa or more and less than 0.8 Mpa, and the pipe diameter is 2 mm in diameter. It was confirmed that it could be operated satisfactorily within a range exceeding 6 mm.

<Modified example>
In the first embodiment, the discharge unit 22 of the discharge mechanism 20 discharges gas such as air that is forced into the generated trim portions 2A and 2B from the surface side, and the suction ducts 31 and 32 of the trim suction mechanism 30 The explanation has been made assuming that suction is applied from the back side of the trim part. In the modified example, the discharge section 22 supplies gas such as air that has passed through the rotary cutter device 10 and is pumped from the back side (vertically downward side) to each trim portion cut into a predetermined shape from the sheet material 2. It may be configured to discharge. The suction ducts 31 and 32 of the trim suction mechanism 30 may be configured to suck from the surface side (vertically upward side) of each trim portion. Even in such a configuration, the suction direction by the suction ducts 31 and 32 and the discharge direction of the gas discharged from each discharge portion can be configured to be substantially on the same line, so that the material cut from the sheet-like material 2 can be The reliability of suctioning each trim portion into the suction duct can be improved.

Although the embodiment of the cutting device 1 according to the present invention has been described above, the content of the present invention is not limited to the above embodiment. Note that the above embodiments and modifications can be combined as appropriate.

1... Cutting device 2... Sheet material 2A, 2B... Trim portion 10... Rotary cutter device 11... Cutter roll 12... Anvil roll 20... Discharge mechanism 21... Compressor 22a, 22b, 22c, 22d , 22e, 22f...Discharge part 30...Trim suction mechanism 31, 32...Suction duct 31a, 32a...Suction port

Claims (10)

It has a cutter roll with a cutter blade formed on its outer peripheral surface, and an anvil roll that receives the cutter blade, and trims the sheet material carried in between the cutter roll and the anvil roll to the product and other than the product. A cutting device comprising a cutting mechanism for cutting into pieces,
a suction mechanism that is provided adjacent to an extending position of either the cutter roll or the anvil roll of the cutting mechanism with respect to the traveling direction in which the sheet material is conveyed, and has a suction duct that sucks the trim; and,
a discharge mechanism that is provided opposite to the suction mechanism with the sheet-like material in between, and has a discharge section that discharges gas toward a suction port opened in the suction duct;
A cutting device equipped with. The discharge part of the discharge mechanism is on the side in the traveling direction in which the sheet material is conveyed with respect to the cutter roll or the anvil roll of the cutting mechanism, and is on the upper side in the perpendicular direction with respect to the sheet material. The cutting device according to claim 1, which is provided on the vertically lower side. The discharge part is a metal tube that guides the gas discharged from the discharge part,
The cutting device according to claim 1 or 2, wherein the discharge mechanism includes a compressor that is connected to the discharge section and pumps the gas discharged from the discharge section. The cutting device according to claim 3, wherein the pressure of the gas discharged from the discharge portion is 0.5 MPa or more and less than 0.8 MPa. The cutting device according to claim 3, wherein the pressure of the gas discharged from the discharge section is 0.5 MPa or more and 0.7 MPa or less. The cutting device according to claim 3, wherein the metal tube constituting the discharge section has a diameter of more than 2.0 mm and less than 6 mm. The discharge mechanism is configured to emit gas toward the suction port of the suction duct when the sheet-like material conveyed from the cutting mechanism passes through the suction port of the suction duct that opens with the sheet-like material sandwiched therebetween. The cutting device according to claim 1 or 2, which discharges the cutting device. The shape of the trim is a non-rectangular shape having a predetermined width in the CD direction,
The cutting device according to claim 1 or 2, wherein a plurality of discharge portions of the discharge mechanism are provided in a CD direction. The cutting device according to claim 1, wherein the discharge direction of the gas discharged from the discharge portion and the suction direction in which the trim is sucked are substantially on the same line. The suction duct of the suction mechanism is provided on the anvil roll side of the cutting mechanism with respect to the traveling direction in which the sheet material is conveyed, and the suction port of the suction duct is provided vertically downward with respect to the sheet material. The cutting device according to claim 1, which is open on the side.

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