JP2007069324A - Web cutting method and device therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting method of a web continuously conveyed and a cutting device therefor. <P>SOLUTION: The web 12 is conveyed from a film manufacturing line to a take-up device at a constant speed. A slit blade forms a web cutting line 60 on the web 12. A rotary cutter forms a cutting line 45 on the web 12. The cutting line 60 by the slit blade is formed within the distance W1 from the terminal of the cutting line 45b in this conveying direction. These cutting lines 45, 60 can cut out a selvage part from the web 12. The slit blade and the rotary cutter are freely movable in the width direction of the web 12 by a shift part. The web of desired width can be cut out by this shift part. Forming method of these cutting lines 45, 60 does not require to slide the blade in the width direction of the web. Therefore, the web can be cut out without decreasing the convey speed of the web. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a web cutting method and a cutting apparatus therefor, which cuts a relatively wide flexible belt-like support (hereinafter referred to as a web) such as a film, which is continuously fed, in the feeding direction.

  In recent years, thin transparent plastic films have been used as protective films for polarizing plates of liquid crystal displays, optical compensation films such as retardation plates, plastic substrates, photographic supports, moving picture cells and optical filters, and optical materials such as OHP films. As demand increases.

  In particular, LCDs have recently been used for personal computers, word processors, portable terminals, televisions, digital still cameras, movie cameras, etc. due to their improved quality and light weight and excellent portability. However, a polarizing plate is essential for this liquid crystal display to display an image. Along with the improvement of the quality of the liquid crystal display, an improvement in the quality of the polarizing plate is required, and at the same time, a transparent plastic film that is a protective film for the polarizing plate is also required to have a higher quality.

  For optical films such as protective films for polarizing plates, high transparency, low optical anisotropy, flatness, easy surface treatment, high durability (dimensional stability, moisture and heat resistance, Water resistance), no foreign matter in and on the film, no scratches on the surface and scratches are difficult (scratch resistance), moderate film rigidity (handleability), and moderate water permeability It is said that it is necessary to have these characteristics.

  Examples of the raw material for the film having these characteristics include cellulose ester, norbornene resin, acrylic resin, polyarylate resin, polycarbonate resin and the like, and cellulose ester is mainly used from the viewpoint of productivity and material price. In particular, a film of cellulose triacetate is particularly advantageously used for optical applications because it has extremely high transparency, low optical anisotropy, and low retardation.

  As a method for forming these films, various film forming techniques such as a solution film forming method, a melt film forming method and a rolling method can be used, but in order to obtain good flatness and low optical anisotropy. The solution casting method is particularly suitable. The solution casting method is a polymer solution in which raw material flakes are dissolved in a solvent, and various additives such as a plasticizer, an ultraviolet absorber, a deterioration preventing agent, a slipping agent, and a peeling accelerator are added thereto as necessary ( Hereinafter, the dope is cast on a support such as a horizontal endless metal belt or a rotating drum by a dope supply means (hereinafter referred to as a casting die), and then the support. This is a method comprising drying to a certain degree above, peeling the self-supporting film to which rigidity has been imparted from the support, and then removing the solvent by passing it through the drying section by various conveying means. The film formed is dried on a take-up reel after the solvent is dried.

In a normal processing and cutting apparatus, the web can be fed after the blade is fixed at the cutting position. However, since the web is continuously formed in the casting apparatus, when changing the width of the web, the blade must be moved to the edge cutting position while cutting with the slit blade from the web edge side. Further, the polarizing film is required to be a light and thin film, and wrinkles are likely to occur when such a thin film is cut with a slit blade. When this wrinkle is generated, the ear part may be broken and cut, and in this case, the casting is stopped and the film forming line is stopped. For this reason, it is possible to reduce the film forming speed when changing the width of the product and return the film forming speed to a predetermined speed after moving the slit blade to the ear cutting position while cutting with the slit blade. There is a problem that the product loss due to the decrease of the product is very large. With respect to such a problem, in Patent Document 1, two upper and lower guide surfaces are provided on a slit blade that is movable in the width direction of the web, and the slit blade is slid from the end surface of the web to move the upper and lower end surfaces of the web into two upper and lower portions. It has been proposed to cut while being brought into contact with the guide surface.
JP 2003-291090 A

  However, due to the recent increase in the speed of the film forming line, in the cutting method in which the slit blade is slid in the width direction of the web, the width of the ear dust to be cut out becomes narrow, the ear dust gets entangled with the slit blade and the film forming line stops Problems began to occur. If the conveyance speed is temporarily reduced to prevent this, the production efficiency is lowered.

  The present invention is for solving the above-described problem, and can cope with an increase in the web conveyance speed, and can continuously cut out webs of different widths without reducing the web conveyance speed. An object of the present invention is to provide a cutting method and a cutting apparatus therefor.

  The web cutting device of the present invention is a web cutting device that cuts the web in a web conveyance direction by a slit blade with respect to a web continuously conveyed in a certain direction. A first moving unit that moves between a cutting position for cutting and a retracted position away from the web, and the slit blade at the retracted position is moved in the width direction of the web to change the cutting position of the web. The second moving unit, the push-cut unit that inserts a cut line from the side edge of the web in a direction that intersects the conveyance direction of the web, and the end of the cut line in the web width direction center side, And a control unit that controls the second moving unit and controls the first moving unit so that a cutting line is continuous with the end by the slit blade. Moreover, it is preferable to provide the 3rd moving part which moves the said notch part to the width direction of the said web, and matches the edge part of the web width direction center part side of the said cut line to a new cutting position.

  The push-cut portion is a rotary cutter composed of a die-cut roll and an anvil roll, and it is preferable that at least one peripheral surface of the die-cut roll and the anvil roll includes a cut-out portion that allows passage of the web. It is preferable that the push-off portion is moved by the third moving portion in a state where the portion is positioned in the web conveyance path.

  The incision line by the push cutting part is composed of a width direction cutting line extending from the web side end toward the center direction and a conveyance direction cutting line extending from the web center side end part of the width direction cutting line in the web conveyance direction. Is preferred. Moreover, it is preferable that the said width direction cutting line cross | intersects at the crossing angle of 40 degrees or more and 80 degrees or less with respect to the side edge of a web.

  It is preferable that the cut line is provided with a width direction auxiliary cutting line from the terminal position of the conveyance direction cutting part toward the side edge of the web. Moreover, it is preferable that the cutting line by the said slit blade cross | intersects the said width direction cutting line, and the distance with the said conveyance direction cutting line is 20 mm or less.

  Further, the web cutting method of the present invention is a web cutting method in which the web is continuously conveyed in a certain direction, and the web is cut in the web conveyance direction by a slit blade. Moving away from the web in the web width direction and setting a new cutting position; and forming a cut line in the web from the side edge of the web toward the center of the web by a push-cut portion; It has the process of cut | disconnecting with the said slit blade so that it may continue to the edge part of the web center side of the said cut line. The cut line by the push-cut portion includes a width direction cutting line extending from the side edge of the web toward the center direction, and a web conveyance direction extending from the web center side edge portion of the width direction cutting line in the web conveyance direction. It is preferably composed of a cutting line.

  It is preferable that the cutting line by the slit blade intersects the width direction cutting line and the distance from the conveyance direction cutting line is 20 mm or less. Moreover, it is preferable that the said cut line by the said push-cut part is provided with the width direction auxiliary | assistant cutting line which goes to the side edge of the said web from the terminal position of the said conveyance direction cutting part. Furthermore, it is preferable that the said web width direction cutting line cross | intersects at the crossing angle of 40 degrees or more and 80 degrees or less with respect to the side edge of the said web.

  The present invention relates to a web cutting apparatus that cuts the web in a web transport direction by a slit blade with respect to a web that is continuously transported in a certain direction, and the slit blade is a cutting position for cutting the web. And a first moving unit that moves between the retracted position away from the web, and a second moving unit that moves the slit blade in the retracted position in the width direction of the web to change the cutting position of the web And the second moving part so as to be connected to the push-cut part for making a cut line from the side end of the web in a direction crossing the web conveyance direction, and the end part on the web width direction center part side of the cut line. And a control unit that controls the first moving unit so that a cutting line is continued to the end by the slit blade. By using such a push-off part and a movable slit blade, it is possible to continuously cut out a product part having a desired width from the web conveyed from the casting apparatus without reducing the conveyance speed of the web conveyance line. It is. In addition, by providing the third moving portion, the push-cut portion is movable in the width direction of the web, so by aligning the end of the cut line in the web width direction center side with a new cutting position, It is possible to continuously cut out a product portion having a desired width.

  The push-cut portion is a rotary cutter composed of a die-cut roll and an anvil roll, and at least one peripheral surface of the die-cut roll and the anvil roll is provided with a cut-out portion that allows the web to pass, so that the web is cut off. When it is not performed, a moving device for retreating from the web becomes unnecessary, and the ear clip device can be manufactured at low cost.

  In order to change the width of the edge cut for a web that is continuously conveyed in a certain direction, it is necessary to form at least a conveyance direction cut line that is horizontal in the conveyance direction from a predetermined position. However, it is impossible to separate the both ears and the product part from the web only by this cutting line in the conveying direction. Therefore, in order to separate the both ears and the product portion from the web, a width direction cutting line from the web side end toward the center is required. Such a width direction cutting line is formed so as to intersect the side edge of the web at an intersecting angle of 40 ° or more and 80 ° or less by the above-described rotary cutter. For this reason, at the time of changing the width of the web, the ear portion of the web does not entangle with the blade.

  By using this cutting line and a cutting line formed so as to be continuous with the cutting line by the slit blade, the web can be cut. Here, the product part can be reliably cut out from the web by providing the cutting line by the slit blade so that the distance from the cutting line in the transport direction is 20 mm or less. Moreover, by providing the width direction auxiliary cutting line from the terminal position of the cutting direction of the cutting line toward the side edge of the web, a positional error due to the third moving unit can be allowed.

  As shown in FIG. 1, the web cutting device 10 of the present invention cuts into both ear portions 12 a and 12 b and a product portion 12 c of a web 12 delivered from a film forming line 11, and a pair of slit blades 13 and 14. And a pair of rotary cutters 16 and 17 as push-cut portions. The slit blades 13 and 14 are disposed at both end portions of the web 12, and rotary cutters 16 and 17 are disposed at both end portions of the web 12 on the upstream side in the transport direction of the slit blades 13 and 14. . The slit blades 13 and 14 and the rotary cutters 16 and 17 have blades capable of forming a cutting line on the web 12. Under the control of the controller 19, in the shift unit 18, the slit blades 13 and 14 are movable in the width direction of the web 12. Similarly, under the control of the controller 19, in the shift unit 20, the rotary cutters 16 and 17 are movable in the width direction of the web 12. Using the slit blades 13 and 14 and the rotary cutters 16 and 17 under the control of the controller 19, the product portion 12c having a desired width can be cut out from the web 12 conveyed from the film forming line 11. it can. The product portion 12c thus obtained is wound up in a roll shape by the web winding device 21.

  Further, between the web winding device 21 and the slit blades 13 and 14, there is provided a knurling device that performs knurling processing consisting of fine irregularities on both ends of the product portion 12c. Winding deviation by the device 21 is prevented. Further, the separated both ear portions 12 a and 12 b are collected by the air feeding device 22 disposed downstream of the slit blade 13 and the slit blade 14. The collected ears 12a and 12b are shortened by a rotary cutter through the suction duct of the air feeding device 22. The shortened ear dust is collected by a cut blower, and becomes finer crushing ear dust. This crushed ear dust can be reused as a film forming material.

  As shown in FIG. 2, the slit blade 13 includes a driven blade 30 and a driving blade 31. Blades 30 a and 31 a are provided on the periphery of the driven blade 30 and the driving blade 31. Further, the driven blade 30 and the driving blade 31 are movable between a cutting position for cutting the web 12 and a retracted position away from the web 12 by the shift unit 32 under the control of the controller 19. Further, the motor 33 under the control of the controller 19 drives the shaft 31 b and causes the driving blade 31 to rotate forward in the conveyance direction of the web 12. When the driven blade 30 and the driving blade 31 are shifted to the cutting position and the driving blade 31 rotates, the driven blade 30 follows the rotation of the driving blade 31. Thus, the driven blade 30 and the driving blade 31 sandwich the web 12 and rotate, whereby the cutting line 13 a can be formed on the web 12. Since the slit blade 14 has the same configuration as the slit blade 13 shown in FIG. 2, the cutting line 14 a (see FIG. 1) can be formed on the web 12 under the control of the controller 19.

  The rotary cutter 16 shown in FIG. 3 includes a die cut roll 40 and an anvil roll 41, respectively. Under the control of the controller 19, the motor 42 drives the shafts 40 a and 41 a to rotate the die cut roll 40 and the anvil roll 41 in the forward direction in the web 12 conveyance direction. The rotary cutter 17 has the same configuration as the rotary cutter 16. The rotary cutters 16 and 17 are preferably formed and arranged so as to have a substantially mirror image relationship with the conveyance direction of the web 12.

  The die cut roll 40 and the anvil roll 41 have push-cut areas 40b and 41b and cut-out areas 40c and 41c that allow the web 12 to pass therethrough. The push-cut regions 40b and 41b are finished smoothly. Further, a press cutting blade 43 is provided in the press cutting region 40 b of the die cut roll 40. When the pressing blade 43 and the pressing region 41 b of the anvil roll 41 sandwich the web 12, the rotary cutter 16 is in a cutting state in which a cutting line 45 can be formed on the web 12. On the other hand, when the cutout regions 40 c and 41 c face each other through the web 12, the rotary cutter 16 enters a retracted state in which the push cutting blade 43 retracts from the web 12. The controller 19 uses the motor 42 to switch between the cutting state and the retracting state of the rotary cutter 16.

  As shown in FIG. 4, the die cut roll 40 has a shape in which a part of the side surface of a cylinder having a center concentric with the shaft 40a and having a bottom surface with a radius R1 is cut away at a notch angle θ1. In order to minimize the rotational moment when the die cut roll 40 rotates about the shaft 40a, a cavity 50 is provided inside the die cut roll 40. The cavity 50 is formed as a cylinder that is eccentric by a distance A1 in a direction away from the notch region 40c from the axis 40a and has a circle having a radius R2 as a bottom surface.

  Similarly, the anvil roll 41 has a shape in which a part of a side surface of a cylinder having a center concentric with the shaft 41a and having a bottom surface with a radius R3 is cut off at a notch angle θ2. Similar to the die cut roll 40, the anvil roll 41 is also provided with a cavity 51. The cavity 51 is formed in a cylindrical shape that is eccentric by a distance A2 in a direction away from the notch region 41c from the shaft 41a and has a circle having a radius R4 as a bottom surface.

  FIG. 5 shows a development view of the press-cut region 40b of the die cut roll 40. As shown in FIG. The push cutting blade 43 includes a first blade 43a and a second blade 43b. The first blade 43a is formed so as to intersect the end surface 40d at an angle θ3 from the end surface 40d in the direction opposite to the rotation direction of the die cut roll 40. Moreover, the 2nd blade 43b is formed in the reverse direction to the rotation direction of the die-cut roll 40 from the terminal end of the 1st blade 43a. The first blade 43a and the second blade 43b are formed so as to be connected to the curve. On the other hand, on the push cutting area 41b of the anvil roll 41, such a push cutting blade is not provided, and the surface thereof is finished smoothly. When the die cutting roll 40 and the anvil roll 41 are rotated, the pressing blade 43 and the pressing region 41b are brought into contact with each other, and a cutting line 45 (FIG. 6) is formed on the web 12 sandwiched between the pressing blade 43 and the pressing region 41b. Reference) is formed. The cut line 45 includes a width direction cutting line 45a and a conveyance direction cutting line 45b.

  The die cut roll 40 and the anvil roll 41 are provided with innumerable ventilation holes in the push-off areas 40b and 41b. In the cut state of the rotary cutter 16, the blower built in the shift unit 20 sends air out of the die-cut roll 40 and the anvil roll 41 through the air duct provided in the shafts 40 a and 41 a.

  The operation of this embodiment will be described. In FIG. 1, when the film forming line 11 is stopped, the slit blades 13 and 14 are in the retracted position. Moreover, the die-cut roll 40 and the anvil roll 41 are in the retracted state. The film forming line 11 is operated, and the web 12 formed by the film forming line 11 is conveyed toward the web winding device 21. Here, in order to cut out the product portion 12 c having a predetermined width from the web 12, the slit blades 13 and 14 are moved to a predetermined position using the shift portion 18. Next, the drive blade 31 of the slit blades 13 and 14 is rotated by the motor 33 (see FIG. 2). Further, the shift unit 32 moves the slit blades 13 and 14 to the cutting position, thereby forming the cutting lines 13 a and 14 a on the web 12. In this way, the product part 12c having a desired width can be cut out. The cut out both ears 12a and 12b are collected by the air blowing device 22 and reused.

  When changing the width of the product portion 12c from which the web is cut, it is performed as follows. First, in order to cut out a product portion having a new width, the shift portion 20 moves the rotary cutter 16 in the width direction. Secondly, the motor 42 rotates the die cut roll 40 and the anvil roll 41 of the rotary cutter 16 once to form a cut line 45 on the web 12 as shown in FIG. After the cut line 45 is formed, the rotary cutter 16 is fixed in the retracted state by the motor 42. Third, when the cutting line 13a formed by the slit blade 13 intersects the cutting line 45, the shift unit 32 moves the slit blade 13 to the retracted position, and further, the shift unit 18 cuts out a new web width. The slit blade 13 is moved in the width direction. Fourth, the shift unit 32 moves the slit blade 13 to the cutting position, and the cutting line 60 that intersects the width direction cutting line 45a of the cutting line 45 is provided on the web 12.

  The controller 19 controls the shift units 18 and 32 so that the cutting lines 13 and 60 formed by the slit blades 13 and 14 and the cutting line 45 intersect. Such control conditions for the shift units 18 and 32 are built in the controller 19 in advance, and the controller 19 controls the shift units 18 and 32 based on the control conditions. This control condition is determined from the shape and size of the cut line 45, the conveyance speed of the web 12, the width of the product part 12c to be cut out, and the like, and can be obtained from experiments or the like.

  In this way, the width of the ear 12b cut out from the web 12 can be changed during the conveyance of the web 12 by the cut line 45 and the cut line 60. Similarly, the ear portion 12 a can be cut out from the web 12 by a cutting line formed by the rotary cutter 17 and the slit blade 14. Thus, the ears 12 a and 12 b are cut out from the web 12, and the product part 12 c having a new width is taken up by the web take-up device 21.

  The cut line 45 is formed so as to intersect the web end portion 12d at an intersection angle θ4. In such a push-off method using the rotary cutters 16 and 17, the crossing angle θ4 is preferably set to 40 ° to 80 °. This angle θ4 is determined from the installation direction of the rotary cutters 16 and 17 with respect to the conveyance direction of the web 12 and the angle θ3 which is the formation direction of the press cutting blades of the rotary cutters 16 and 17, and by selecting these appropriately, a desired value can be obtained. An angle θ4 can be obtained. Moreover, since the width direction cutting line 45a and the conveyance direction cutting line 45b that form the cutting line 45 are formed so as to be connected to the curve, the web 12 is prevented from being broken from the vicinity of the intersection of the cutting lines 45a and 45b. In addition, in the cutting state of the rotary cutter 16, the web 12 is prevented from sticking to the surfaces of the die cut roll 40 and the anvil roll 41 by the air blown from the air holes formed on the surfaces of the die cut roll 40 and the anvil roll 41. .

  In such a web cutting method, it is preferable to cut so that the interval W1 between the cutting line 60 and the cutting line 45 is about 20 mm or less. In addition, in order to give versatility to this cutting method, it is necessary to secure the length of the width direction cutting line 45a by L1. By doing in this way, it becomes possible to cut out the product part 12c of various widths. Therefore, as shown in FIG. 6, the length L1 of the width direction cutting line 45a is preferably about 150 mm. Therefore, it is preferable that the radii R1 and R3 of the die cut roll 40 and the anvil roll 41 are approximately 170 mm, and the notch angles necessary for forming the notches 40c and 41c on the die cut roll 40 and the anvil roll 41 It is preferable that θ1 and θ2 are approximately 100 °. The cylinders forming the cavities 50 and 51 preferably have eccentric distances A1 and A2 from the shafts 40a and 41b of approximately 15 mm, and radii R2 and R4 of the bottom surfaces of the cylinders of approximately 100 mm. .

  In this way, the cutting method of the web 12 using the rotary cutters 16 and 17 having the slit blades 13 and 14 and the cutting blade 43 is arranged so that the slit blades 13 and 14 are moved in the width direction of the web 12 during the conveyance of the web 12. Therefore, the webs 12 of various widths can be continuously cut out while maintaining the conveying speed of the web 12 without the ears 12a and 12b being entangled with the slit blades 13 and 14. .

  In the said embodiment, although the rotary cutters 16 and 17 are installed upstream of the slit blades 13 and 14, not only this but the downstream of the slit blades 13 and 14 may be sufficient.

  In the said embodiment, although it described that the die cut roll 40 and the anvil roll 41 were formed in the shape which cut off the side surface of the cylinder with the plane, not only this but the shape which can accept | permit passage of the web 12 by rotating a shaft | axis. If so, an equivalent effect can be obtained. Further, this notch portion may be provided only on one of the die cut roll and the anvil roll.

  In the above embodiment, it is described that the cutting line 60 is formed on the extension line of the conveyance direction cutting line 45b. However, the present invention is not limited to this, and the width direction auxiliary breaking line 45c or 45d is formed from the end of the conveyance direction cutting line 45b as shown in FIG. Additional formation may be performed. By providing such a width direction auxiliary disconnection 45c or 45d, it becomes easy to adjust the position of the slit blades 13 and 14 in the width direction, and the ears 12a and 12b having a desired cutting width are reliably cut out from the web 12. It becomes possible. Further, such a width direction auxiliary disconnection 45c or 45d can be implemented by additionally forming a third blade 43c or a fourth blade 43d as shown in FIG.

  In the above embodiment, when changing the cutting width of the web 12, the shift unit 32 temporarily moves the slit blades 13 and 14 from the web 12 to the retracted position and cuts out the web 12 having a new width. , 14 is moved again to the cutting position. However, when fine adjustment of the cutting width of the web 12 is performed, the slit blades 13 and 14 at the cutting position are rotated and moved in the width direction of the web 12. It is also possible.

It is a top view which shows the outline | summary of a web cutting device. It is a perspective view which shows the outline | summary of a slit blade. It is a perspective view which shows the outline | summary of a rotary cutter. It is a side view of a die cut roll and an anvil roll. It is an expanded view of the press-cut area | region of a die-cut roll. It is a top view which shows the outline | summary of the cutting line formed on a web with a slit blade and a rotary cutter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Web cutting device 11 Film-forming line 12 Web 13, 14 Slit blade 16, 17 Rotary cutter 18, 20, 32 Shift part 19 Controller 21 Web winding device 40 Die cut roll 41 Anvil roll 40b, 41b Press cut area 40c, 41c Notch Area 43 Pressing blade 45 Cutting line 45a Width direction cutting line 45b Transport direction cutting line 45c, 45d Width direction auxiliary cutting line 50, 51 Cavity 60 Cutting line θ4 Crossing angle

Claims (13)

In a web cutting device that cuts the web in the web conveyance direction by a slit blade with respect to the web continuously conveyed in a certain direction,
A first moving unit that moves the slit blade between a cutting position for cutting the web and a retracted position away from the web;
A second moving unit that changes the cutting position of the web by moving the slit blade in the retracted position in the width direction of the web;
A push-cut portion for making a score line from a side edge of the web in a direction intersecting the transport direction of the web;
The second moving unit is controlled so as to be connected to the end portion on the web width direction center side of the cut line, and the first moving unit is controlled by the slit blade so that the cutting line is continued to the end portion. And a web cutting device.   2. The apparatus according to claim 1, further comprising a third moving unit that moves the push-cut portion in a width direction of the web to align an end portion of the cut line in the web width direction center portion with a new cutting position. Web cutting device.   The push-cut portion is a rotary cutter made up of a die-cut roll and an anvil roll, and at least one peripheral surface of the die-cut roll and the anvil roll is provided with a cut-out portion that allows the web to pass therethrough. The web cutting device according to 1 or 2.   4. The web cutting device according to claim 2, wherein the push-cut portion is moved by the third moving portion in a state where the notch portion is positioned in the web conveyance path. 5. The cut line by the push-cut portion is
A widthwise cut line from the side edge of the web toward the center;
5. The web according to claim 1, comprising a widthwise cutting line and a conveyance direction cutting line extending in a conveyance direction of the web from an end portion of the web on the center side. Cutting device.   The web cutting device according to claim 5, wherein the cutting line by the slit blade intersects the width direction cutting line, and a distance from the cutting direction cutting line is 20 mm or less.   7. The web cutting device according to claim 5, wherein the cut line formed by the push-cut portion includes a width direction auxiliary cutting line from a terminal position of the conveyance direction cutting portion toward a side edge of the web.   The web cutting device according to any one of claims 5 to 7, wherein the width direction cutting line intersects with a side edge of the web at an intersecting angle of 40 ° or more and 80 ° or less. In the web cutting method of cutting the web in the web conveyance direction by a slit blade with respect to the web continuously conveyed in a certain direction,
Moving the slit blade away from the web in the web width direction and setting a new cutting position;
Forming a cut line in the web from the side edge of the web toward the center of the web by a push cut portion; and
A method for cutting a web, comprising a step of cutting with the slit blade so as to be continuous with an end portion of the cut line on the center side of the web.   The cut line by the push-cut portion includes a width direction cut line extending from the side end of the web toward the center direction, and a web conveyance direction cut line extending from the web center side end portion of the width direction cut line in the web conveyance direction. The web cutting method according to claim 9, comprising:   The cutting line by the said slit blade cross | intersects the said width direction cutting line, The distance with the said conveyance direction cutting line is 20 mm or less, The cutting method of the web of Claim 10 characterized by the above-mentioned.   The web cutting method according to claim 11, wherein the cut line formed by the push cut portion includes a width direction auxiliary cut line from a terminal position of the conveyance direction cut portion toward a side edge of the web. The web cutting method according to any one of claims 10 to 12, wherein the web width direction cutting line intersects with a side edge of the web at an intersecting angle of not less than 40 ° and not more than 80 °.

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