Adhesion Removing Device, Adhesion Removing Method, Recycling Method of Sheet Member, and Manufacturing Method of Electronic Component

Abstract

To provide an adhering substance removal device capable of removing adhering substances safely and easily.SOLUTION: An adhering substance removal device 2 of the invention includes: a delivery mechanism 120 which delivers an elongated sheet member 100; a winding mechanism 130 which winds up the sheet member 100 delivered by the delivery mechanism 120; pressing blade members 20 each extending along a blade axis A and having a blade edge 21 in which a cross sectional shape orthogonal to the blade axis A curves, each pressing blade member 20 configured to press a surface of the sheet member 100 with the blade edge 21 in a state that the blade edge 21 is directed to an upstream side in a transport direction of the sheet member 100; and a dust collection mechanism 180 which collects adhering substances peeled from the sheet member 100.SELECTED DRAWING: Figure 9

Description

Technical Field

[0001] The present invention relates to an attachment removal device, an attachment removal method, a recycling method for a sheet member, and a method for manufacturing an electronic component.

Background Art

[0002] As an electronic component, for example, in a multilayer ceramic capacitor, a plurality of ceramic green sheets are laminated. Here, the ceramic green sheet is used with a sheet member such as a PET film on the back to improve handling properties.

[0003] In recent years, resource reuse and the like have been demanded as measures for environmental resources. Such a sheet member is returned to the raw material level after the attachments on the sheet member are removed, pelletized, and reused. Conventionally, as a method for removing attachments on such a sheet member, a method of cleaning the sheet member with an organic solvent has been used (see Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, when the sheet member is cleaned with an organic solvent, if the organic solvent used for cleaning is discarded as it is, it may have an adverse effect on the environment. Therefore, a purification operation of the organic solvent is required. For this reason, it is time-consuming, and a large amount of water or the like for purification is required, which is not environmentally friendly.

[0006] An object of the present invention is to provide an attachment removal device and an attachment removal method capable of safely and easily removing attachments, and to provide an efficient recycling method for a sheet member and a method for manufacturing an electronic component.

Means for Solving the Problem

[0007] In order to solve the above problems, the present invention provides an apparatus for removing deposits from a sheet member, which includes a feeding mechanism for feeding out a long sheet member, a winding mechanism for winding up the sheet member fed out by the feeding mechanism, a pressing blade member having a blade edge that extends along a blade axis and has a curved cross-sectional shape orthogonal to the blade axis, and pressing the surface of the sheet member with the blade edge in a state where the blade edge faces the upstream side in the conveyance direction of the sheet member, and a dust collection mechanism for collecting deposits peeled off from the sheet member.

[0008] Also, in order to solve the above problems, the present invention provides a method for removing deposits from a sheet member, which includes feeding out a long sheet member having deposits adhered to its surface, pressing the surface of the sheet member with the blade edge of a pressing blade member having a blade edge that extends along a blade axis and has a curved cross-sectional shape orthogonal to the blade axis in a state where the blade edge faces the upstream side in the conveyance direction of the sheet member, thereby peeling the deposits from the sheet member, collecting the deposits peeled off from the sheet member, and winding up the sheet member from which the deposits have been peeled off.

[0009] Furthermore, the present invention provides a recycling method for a sheet member, which includes feeding out a long sheet member having deposits adhered to its surface, pressing the surface of the sheet member with the blade edge of a pressing blade member having a blade edge that extends along a blade axis and has a curved cross-sectional shape orthogonal to the blade axis in a state where the blade edge faces the upstream side in the conveyance direction of the sheet member, thereby peeling the deposits from the sheet member, collecting the deposits peeled off from the sheet member, winding up the sheet member from which the deposits have been peeled off, and pulverizing the sheet member from which the deposits have been removed to form pellets.

[0010] In addition, the present invention provides a method for manufacturing an electronic component, which includes feeding out a long sheet member having deposits adhered to its surface, pressing the surface of the sheet member with a cutting edge of a pressing blade member having a cutting edge that extends along a blade axis and has a curved cross-sectional shape orthogonal to the blade axis with the cutting edge facing upstream in the conveyance direction of the sheet member to peel off the deposits from the sheet member, collecting the deposits peeled off from the sheet member, winding up the sheet member from which the deposits have been peeled off, pulverizing the sheet member from which the deposits have been removed to form pellets, regenerating a long sheet member using the pellets, forming a ceramic green sheet on the regenerated sheet member, and manufacturing an electronic component using the ceramic green sheet.

Advantages of the Invention

[0011] According to the present invention, it is possible to provide a deposit removing device and a deposit removing method that can safely and easily remove deposits, and also to provide an efficient recycling method for sheet members and a manufacturing method for electronic components.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Mode for Carrying Out the Invention

[0013] Hereinafter, the deposit removing device 1 and the deposit removing method according to the embodiments of the present invention will be described. FIG. 1 is a diagram showing the deposit removing device 1, and FIG. 2 is a diagram showing the sheet member 100 from which the deposit 101 is removed by the deposit removing device 1 of the embodiment.

[0014] (Sheet member 100) The sheet member 100 is long and made of a resin such as PET (polyethylene terephthalate), for example, and the deposit 101 adheres on a release layer (not shown) formed on the surface. The width of the sheet member 100 is, for example, 180 mm or more and 330 mm or less, and the thickness of the sheet member 100 is, for example, 0.5 μm or more and 20 μm or less.

[0015] (Deposit 101) The deposit 101 is, for example, a residue of a ceramic green sheet and adheres in a ladder shape. That is, the deposit 101 has two longitudinal deposits 101a extending in the longitudinal direction L on both sides in the width direction W of the long sheet member 100 while maintaining a certain width direction distance between them, and a plurality of width direction deposits 101b extending in the width direction W at regular intervals in the longitudinal direction L between the two longitudinal deposits 101a.

[0016] Thus, the reason why the deposits 101 adhere to the sheet member 100 in a ladder shape will be explained. The sheet member 100 is used in an intermediate process of manufacturing laminated electronic components such as the laminated ceramic capacitor 300. FIG. 3 is a diagram showing the laminated ceramic capacitor 300 created using the sheet member 100. The laminated ceramic capacitor 300 is manufactured as follows.

[0017] (a) First, a release layer (not shown) is provided on the surface of the long sheet member 100, for example, made of PET. A slurry that becomes a ceramic green sheet containing a dielectric ceramic powder, a binder, a solvent, etc. is coated in a sheet shape on the surface of the sheet member 100 provided with this release layer.

[0018] (b) Next, an electrode pattern is printed on the surface of the ceramic green sheet coated in a sheet shape on the sheet member 100.

[0019] (c) Then, the ceramic green sheet printed with the electrode pattern is cut into a rectangle and peeled off from the sheet member 100 using the sheet peeling device 200.

[0020] FIG. 4 is a schematic diagram of an example of the sheet peeling device 200. The sheet peeling device 200 includes a conveyance roll 201, a peeling roll 202, a cutting blade 203, a cutting stage 204, a peeling head 205, and a laminating stage 206. The cutting blade 203 and the cutting stage 204 are arranged in a cutting region A1 through which the sheet member 100 conveyed between the conveyance roll 201 and the peeling roll 202 passes, and the peeling head 205 and the laminating stage 206 are arranged in a peeling region A2 downstream of the cutting region A1 in the conveyance direction H.

[0021] A sheet member 100 that holds a ceramic green sheet with an electrode pattern printed thereon on its surface is conveyed onto a cutting stage 204 in a cutting area A1 by a conveying roll 201. There, a cutting blade 203 descends, and the ceramic green sheet with the electrode pattern printed thereon on the sheet member 100 is cut into a rectangle. Note that since it is difficult to cut out only the ceramic green sheet from the sheet member 100, a part of the sheet member 100 may be cut together with the ceramic green sheet by the cutting blade 203.

[0022] Next, the sheet member 100 is conveyed from the cutting area A1 to a peeling area A2. In the peeling area A2, a peeling head 205 descends, and the ceramic green sheet 101c with the electrode pattern printed thereon, which has been cut into a rectangle, is sucked by the peeling head 205. When the ceramic green sheet 101c cut into a rectangle is sucked and peeled from the sheet member 100, remnants of the ladder-shaped ceramic green sheet as shown in FIG. 2 remain as an attachment 101 on the sheet member 100. This is the reason why the attachment 101 adheres to the sheet member 100 in a ladder shape.

[0023] (d) When the ceramic green sheet 101c cut into a rectangle is sucked by the peeling head 205, the peeling roll 202 retracts from the peeling area A2. FIG. 5 is a diagram showing a part of a sheet peeling device 200 in a state where the peeling roll 202 has retracted from the peeling area A2.

[0024] The ceramic green sheet 101c cut into a rectangle is laminated on the lamination stage 206. FIG. 6 is a view showing a mother block laminate 210 formed by repeatedly laminating the ceramic green sheet 101c cut into a rectangle. The mother block laminate 210 formed by laminating a predetermined number of ceramic green sheets 101c is cut to a predetermined size to obtain a plurality of laminate chips 220. Thereafter, an external electrode 310 is formed on the outer surface of the laminate chip 220, and a multilayer ceramic capacitor 300 as shown in FIG. 3 is manufactured. Note that a ceramic green sheet on which no electrode pattern is printed may be laminated so as to sandwich the laminate 210.

[0025] On the other hand, the sheet member 100 in which the ceramic green sheet remains as the attachment 101 in a ladder shape is pulverized after the attachment 101 is removed to form PET pellets as the raw material of the sheet member 100. The pellets are regenerated as the sheet member 100, and the steps after (a) above are repeated.

[0026] (Deposit removing device 1) Next, the deposit removing device 1 and the deposit removing method according to the embodiment for removing the deposit 101 from the sheet member 100 will be described. Returning to FIG. 1, the deposit removing device 1 includes a deposit removing unit 110 and a dust collecting mechanism 180.

[0027] (Deposit removing unit 110) FIG. 7 is a diagram for explaining the deposit removing unit 110. The deposit removing unit 110 includes a feeding mechanism 120 for feeding out the sheet member 100, a winding mechanism 130 for winding up the sheet member 100 fed out by the feeding mechanism 120, and a pressing member 140 that presses the sheet member 100 from the back side so as to bend the sheet member 100 such that the front surface side thereof becomes convex between the time when it is fed out by the feeding mechanism 120 and the time when it is wound up by the winding mechanism 130. A wide-area air nozzle 150 that blows air across the width direction W of the sheet member 100 toward the front surface side of the sheet member 100 on the downstream side in the conveyance direction H of the sheet member 100 from the position where the pressing member 140 is disposed, and partial air nozzles 160 that blow air against both sides in the width direction W of the sheet member 100 are provided.

[0028] The deposit removing unit 110 further includes a back-side air nozzle 170 that blows air against the back side of the sheet member 100 on the upstream side in the conveyance direction H of the sheet member 100 from the pressing member 140.

[0029] Further, the deposit removing unit 110 includes an ionizer 191 and a removal sensor 192 on the downstream side in the conveyance direction H from the pressing member 140. The ionizer 191 prevents the deposits 101 removed by the back-side air nozzle 170, the pressing member 140, the wide-area air nozzle 150, and the partial air nozzles 160 from rising by the air and reattaching to the sheet member 100. The removal sensor 192 is, for example, a transmissive laser sensor or a fiber sensor, etc., and measures the removal rate of the removed deposits 101.

[0030] (Feeding mechanism 120) The feeding mechanism 120 includes a feeding roll 121, and a brake 123 for applying tension to the sheet member 100 is attached to the central axis of the feeding roll 121. The long sheet member 100 with the attachments 101 attached thereto in a ladder shape as described above is wound around the feeding roll 121. In the embodiment, although not limited thereto, the sheet member 100 is wound around the feeding roll 121 such that the surface to which the attachments 101 are attached faces the inner diameter side, and is fed out such that this surface faces downward.

[0031] (Take-up mechanism 130) The take-up mechanism 130 includes a take-up roll 131, and the central axis of the take-up roll 131 is connected to a take-up motor (not shown). When the take-up motor rotates and the take-up roll 131 rotates, and the sheet member 100 is taken up against the brake 123, the sheet member 100 is conveyed at a constant tension and a constant conveyance speed. In the embodiment, the conveyance speed of the sheet member 100 is 100 m / min or more and 250 m / min or less.

[0032] The attachment removing unit 110 further includes two auxiliary rolls 122 and an auxiliary roll 132. The sheet member 100 fed out from the feeding roll 121 is guided and conveyed by the auxiliary roll 122 and the auxiliary roll 132 such that the surface to which the attachments 101 are attached faces downward, and is taken up by the take-up roll 131 of the take-up mechanism 130.

[0033] (Pressing member 140) In the embodiment, the pressing member 140 is a pressing blade with a pointed tip. The pressing member 140 is disposed between the auxiliary roll 122 and the auxiliary roll 132, and is pressed against the sheet member 100 from the back surface side of the sheet member 100. In the embodiment, since the surface of the sheet member 100 faces downward, the pressing member 140 presses the sheet member 100 from above downward.

[0034] When the pressing member 140 is pressed against the sheet member 100 from the back side, since the sheet member 100 is flexible, it bends following the tip shape of the pressing member 140. On the other hand, the deposit 101 attached to the sheet member 100 is a ceramic green sheet in the embodiment and is not easily bent like the tip shape of the pressing member 140. And since a release agent is applied to the surface of the sheet member 100, a gap is generated between the deposit 101 and the sheet member 100, and the deposit 101 peels off from the sheet member 100 and falls downward. In this way, the deposit 101 is separated from the sheet member 100.

[0035] If the tip radius R of the pressing member 140 is larger than 1 mm, it becomes difficult for a difference to occur in the degree of bending between the deposit 101 and the sheet member 100, and it becomes difficult to peel the deposit 101 from the sheet member 100. Also, if it is smaller than 0.1 mm, the sheet member 100 may be damaged such as breaking from the cut made by the cutting blade 03. Therefore, the tip radius R of the pressing member 140 is 1 mm or less, and preferably 0.1 mm or more and 0.5 mm or less.

[0036] The sheet member 100 pressed by the pressing member 140 so that the front side becomes convex is bent at the bending angle θ1. If the bending angle θ1 is larger than 90°, it becomes difficult for a difference to occur in the degree of bending between the deposit 101 and the sheet member 100, and it becomes difficult to peel the deposit 101 from the sheet member 100. Therefore, the bending angle θ1 is 90° or less, preferably 30° or more and 70° or less, and more preferably 30° or more and 60° or less.

[0037] (Wide-area air nozzle 150) As described above, the deposit 101 is formed in a ladder shape. Among the deposits 101, the width-direction deposit 101b has a short length in the longitudinal direction L, so it is not easily cracked even when pressed by the pressing member 140, and it is difficult to form a peeling trigger. Therefore, the deposit removing device 1 of the embodiment includes a wide-area air nozzle 150 in order to make it easier to peel the width-direction deposit 101b.

[0038] FIG. 8 is a diagram for explaining the positions of the wide-area air nozzle 150 and the partial air nozzle 160, and is a view of the deposit removing device 1 shown in FIG. 7 as seen from below upward. The wide-area air nozzle 150 has a plurality of ejection ports 151 arranged at regular intervals across the width direction W of the sheet member 100.

[0039] The wide-area air nozzle 150 is arranged on the downstream side in the conveyance direction H of the sheet member 100 from the position where the pressing member 140 is arranged. The ejection port 151 of the wide-area air nozzle 150 is at a position separated by a distance L1 in the conveyance direction H from the pressing member 140 as shown in FIGS. 7 and 8, and is arranged at a position separated by a distance T1 from the sheet member 100 as shown in FIG. 7. Preferably, L1 is 5 mm or more and 30 mm or less, and T1 is 3 mm or more and 20 mm or less.

[0040] Air is jetted from the ejection port 151 of the wide-area air nozzle 150 toward the position where the sheet member 100 is bent by the pressing member 140. Preferably, the flow rate of the air jetted from the wide-area air nozzle 150 is 200 L / min or more and 400 L / min or less.

[0041] The wide-area air nozzle 150 blows air across at least the entire area where the ladder-shaped deposits 101 are attached, from one side to the other side in the width direction W. Preferably, the wide-area air nozzle 150 blows air over an area wider in the width direction W than the area where the ladder-shaped deposits 101 are attached.

[0042] (Partial air nozzle 160) In this way, the deposits 101 are removed by the pressing member 140 and the wide-area air nozzle 150. However, for the two longitudinal deposits 101a extending in the longitudinal direction L among those attached in a ladder shape, since the amount is large, there may still be some remaining.

[0043] Therefore, the deposit removing device 1 of the embodiment further includes a partial air nozzle 160. The partial air nozzle 160 includes a partial air nozzle 160a that blows air toward one side in the width direction W of the sheet member 100, and a partial air nozzle 160b that blows air toward the other side in the width direction W of the sheet member 100. Each has an ejection port 161. The width between the two ejection ports 161 is preferably 60 mm or more and 150 mm or less. The partial air nozzle 160a and the partial air nozzle 160b blow air against regions that are 15% or more and 25% or less of the length of the sheet member 100, respectively.

[0044] Similar to the wide-area air nozzle 150, the partial air nozzle 160 is disposed on the downstream side in the conveyance direction H of the sheet member 100 from the position where the pressing member 140 is disposed. The ejection port 151 of the partial air nozzle 160 is also disposed at a position separated from the pressing member 140 by a distance L1 and from the sheet member 100 by a distance T1 in the conveyance direction H. L1 is preferably 5 mm or more and 30 mm or less, and T1 is preferably 3 mm or more and 20 mm or less. Further, the air from the ejection port 161 of the partial air nozzle 160 is jetted toward the position where the sheet member 100 is bent by the pressing member 140. The flow rate of the air jetted from the partial air nozzle 160 is preferably 200 L / min or more and 400 L / min or less, similar to the wide-area air nozzle 150.

[0045] (Back-side air nozzle 170) In addition, due to the winding of the sheet member 100 on the pay-off roll 121, deposits 101 may be transferred to the back surface of the sheet member 100 where the release agent is not applied because the deposits 101 contain a binder. In particular, transfer is remarkable in the vicinity of the start of winding, about 30 mm from the paper tube. If the sheet member 100 is conveyed with the transferred deposits 101 remaining, the transferred deposits 101 may be scraped out and deposited at the pressing member 140, hindering the pressing by the pressing member 140.

[0046] Therefore, the deposit removing device 1 of the embodiment further includes a backside air nozzle 170 that blows air onto the backside of the sheet member 100 to blow off the transferred deposits 101. The backside air nozzle 170 preferably ejects air in a spiral shape, for example, a patagone.

[0047] The backside air nozzle 170 is arranged upstream of the pressing member 140 in the conveyance direction H of the sheet member 100. In the embodiment, the backside air nozzle 170 is arranged to blow air near the inflection point where the trajectory along the circumference of the pay-off roll 121 of the sheet member 100 changes to a straight trajectory.

[0048] Also, the distance between the backside air nozzle 170 and the position on the sheet member 100 where air is blown decreases as the diameter of the sheet member fed from the pay-off roll 121 becomes smaller. However, by a driving unit (not shown), the distance between the air ejection position and the position on the sheet member 100 where air is blown is made movable so that it remains constant regardless of the amount of the sheet member 100 wound around the pay-off roll 121. Therefore, air can always be blown onto the sheet member 100 at a constant wind speed and air volume.

[0049] In the embodiment, the backside air nozzle 170 has an air pressure of 0.5 MPa and an air volume of 110 L / min, and the removal speed of the deposits 101 is equivalent to 200 m / min. As a result of conducting experiments using fine particles of 1.7 μm, 3.4 μm, and 3.35 μm, when the distance between the backside air nozzle 170 and the sheet member 100 was 50 mm, the deposits of 1.7 μm, 3.4 μm, and 3.35 μm could be removed. When the distance between the backside air nozzle 170 and the sheet member 100 was 100 mm, the deposits of 1.7 μm, 3.4 μm, and 3.35 μm could similarly be removed. When the distance between the backside air nozzle 170 and the sheet member 100 was 150 mm, the deposits of 3.4 μm and 3.35 μm could be removed, but the 1.7-μm deposits could not be removed. When the distance between the backside air nozzle 170 and the sheet member 100 was 200 mm, none of the 1.7-μm, 3.4-μm, and 3.35-μm deposits could be removed. Therefore, the distance between the backside air nozzle 170 and the sheet member 100 is preferably 50 mm or more and 100 mm or less.

[0050] (Dust collection mechanism 180) The dust collection mechanism 180 includes a suction hood 181 disposed below the deposit removal unit 110, a SUS drum 182 connected to the suction hood 181, and a vacuum device 183 that sucks the inside of the suction hood 181 via the SUS drum 182. The deposits 101 peeled off from the sheet member 100 fall into the suction hood 181 and are sucked by the vacuum device 183 and collected inside the SUS drum 182.

[0051] According to the deposit removal method using the deposit removal device 1 of the first embodiment, the sheet member 100 fed out from the feeding roll 121 is guided and conveyed by the auxiliary roll 122 and the auxiliary roll 132 with the surface to which the deposits 101 are attached facing downward, and is wound around the winding roll 131 of the winding mechanism 130.

[0052] When the pressing member 140 is pressed against the sheet member 100 from the back side, since the sheet member 100 is thin, it bends following the tip shape of the pressing member 140. On the other hand, the deposit 101 attached to the sheet member 100 is a ceramic green sheet in the embodiment and has a greater thickness than the sheet member 100, and it is difficult to bend in the same way as the tip shape of the pressing member 140. Therefore, a gap is generated between the sheet member 100 and the deposit 101, and the deposit 101 peels off from the sheet member 100 and falls downward. In this way, the deposit 101 is separated from the sheet member 100.

[0053] At this time, among the deposits 101, the deposits 101b in the width direction are less likely to crack when pressed by the pressing member 140, and it is difficult to form a peeling trigger. However, the deposit removing device 1 of the embodiment includes a wide-area air nozzle 150, and since air is blown onto the deposits 101b in the width direction, it is possible to make the deposits 101b in the width direction more likely to crack, and the removal efficiency of the deposits 101 is improved.

[0054] Furthermore, since the wide-area air nozzle 150 blows air over a wide area in the width direction W, even if the sheet member 100 meanders, air can be blown evenly over the entire deposit 101.

[0055] In addition, for the two longitudinal deposits 101a extending in the longitudinal direction L among those attached in a ladder shape, air is further blown by the partial air nozzle 160, so that the longitudinal deposits 101a can also be removed more effectively.

[0056] Furthermore, according to the embodiment, since a back-side air nozzle 170 for blowing air is provided on the back side of the sheet member 100, the deposits 101 transferred to the back surface of the sheet member 100 where no release agent is applied can be blown off. Therefore, the deposits 101 do not accumulate at the pressing member 140.

[0057] Then, the sheet member 100 from which the deposit 101 has been removed by the deposit removing device 1 is pulverized to form PET pellets, and the pellets are recycled as the sheet member 100, thereby providing a recycling method for the sheet member 100.

[0058] Furthermore, a slurry to be a ceramic green sheet is coated in a sheet shape on the regenerated sheet member 100 thus obtained. Next, an electrode pattern is printed on the surface of the sheet member 100 on which the ceramic green sheet is coated in a sheet shape. Then, the ceramic green sheet on which the electrode pattern is printed is cut into a rectangle and peeled off from the sheet member 100 using the sheet peeling device 200. The peeled ceramic green sheets 101c are laminated to form a mother block laminate 210. The mother block laminate 210 is cut into a predetermined size to obtain a plurality of laminate chips 220. Thereafter, the laminate chips 220 are fired and an external electrode 310 is formed on the outer surface, thereby providing a manufacturing method for manufacturing a multilayer ceramic capacitor 300 as an electronic component.

[0059] (Second Embodiment) FIG. 9 is a diagram for explaining the deposit removing device 2 of the second embodiment. Different from the deposit removing device 2 of the first embodiment, the deposit removing device 2 is provided with no pressing member and air nozzle, but a pressing blade member 20 is arranged. Since other parts are the same as those of the first embodiment, the same parts are denoted by the same reference numerals as those of the first embodiment and the description thereof is omitted.

[0060] (Pressing Blade Member 20) The pressing blade member 20 extends along the blade axis A and has a blade tip 21 that is curved in a cross-sectional shape perpendicular to the blade axis A. FIG. 10 is a perspective view of the blade tip 21 at the tip of the pressing blade member 20. The curved shape of the blade tip 21 is, for example, an arc shape or an elliptical arc shape.

[0061] FIG. 11 is a diagram for explaining the position of the pressing blade member 20 with respect to the sheet member 100. As shown in the drawing, a plurality of pressing blade members 20 are arranged side by side in the width direction W of the sheet member 100. Further, the rows of the plurality of pressing blade members 20 arranged side by side in the width direction W are respectively arranged at a plurality of different positions in the conveying direction H. The rows of the pressing blade members 20 are arranged at two different positions, namely, a front row 20A arranged at the conveying direction position H1 from the upstream side to the downstream side in the conveying direction H and a rear row 20B arranged at the conveying direction position H2.

[0062] Further, as shown in FIG. 9, the blade shaft A is arranged in a state inclined at a contact angle θ2 with respect to the sheet member 100. The contact angle θ2 is preferably 10° or more and 20° or less.

[0063] The pressing blade members 20 of the rear row 20B are arranged such that the center in the width direction W comes to the downstream side in the conveying direction H of the position in the width direction W between the adjacent pressing blade members 20 in the front row 20A. And, in the width direction W, the region where the pressing blade members 20 of the front row 20A press the sheet member 100 and the region where the pressing blade members 20 of the rear row 20B press the sheet member 100 partially overlap. That is, the blade tips 21 of the pressing blade members 20 of the front row 20A and the blade tips 21 of the pressing blade members 20 of the rear row 20B press a region of the sheet member 100 that partially overlaps in the width direction W.

[0064] Further, as shown in FIG. 11, the blade shaft A is arranged slightly obliquely at an angle α with respect to the conveying direction H of the sheet member 100.

[0065] According to the deposit removing method using the deposit removing device 2 of the second embodiment, the sheet member 100 fed out from the feeding roll 121 is guided and conveyed by the auxiliary roll 122 and the auxiliary roll 132 with the surface to which the deposit 101 is attached facing downward, and is wound around the winding roll 131 of the winding mechanism 130.

[0066] During the conveyance of the sheet member 100 from the pay-out roll 121 of the pay-out mechanism 120 until it is taken up by the take-up roll 131 of the take-up mechanism 130, the cutting edge member 20 presses the surface of the sheet member 100 with the cutting edge 21 in a state where the blade shaft A is inclined at an angle θ2 along the conveyance direction H of the sheet member 100 and in a direction perpendicular to the sheet member 100.

[0067] A predetermined tension is applied to the sheet member 100, and when the cutting blade 203 is pressed against it, the sheet member 100 bends along the shape of the cutting blade 203. Then, the deposit 101 on the sheet member 100 is cut out and peeled off by the cutting edge 21 of the pressing blade member 20.

[0068] At this time, when the cutting edge 21 presses the sheet member 100, the sheet member 100 bends following the curved shape of the cutting edge 21, so that the cutting edge 21 can bite into the sheet member 100 and efficiently peel off the deposit 101. Also, since the cutting edge 21 is curved, the sheet member 100 is less likely to be damaged compared to a straight blade.

[0069] At this time, for example, among the deposits 101b in the width direction, those passing between the pressing blade members 20 arranged in the width direction W in the front row 20A may remain without being sufficiently cut out by the pressing blade members 20 in the front row 20A.

[0070] However, the pressing blade members 20 of the rear row 20B are arranged on the downstream side in the conveyance direction H at the width direction W position between the adjacent pressing blade members 20 in the front row 20A. Therefore, those among the deposits 101b in the width direction that passed between the pressing blade members 20 arranged in the width direction W in the front row 20A and remained without being cut out are cut out by the pressing blade members 20 of the rear row 20B. Thus, the deposit 101 can be sufficiently removed.

[0071] If the contact angle θ2 between the sheet member 100 and the cutting edge 21 of the pressing blade member 20 is greater than 20°, it is difficult to smoothly peel off the deposit 101, and there is a possibility that the cutting edge 21 may be damaged due to being caught by the deposit 101. On the other hand, if it is less than 10°, there is a possibility that a portion other than the cutting edge 21 of the pressing blade member 20 may contact the sheet member 100 and interfere with the conveyance of the sheet member 100. However, since the blade axis A of the embodiment is arranged in a state inclined at a contact angle θ2 of 10° or more and 20° or less with respect to the sheet member 100, such a situation does not occur.

[0072] The blade axis A is arranged slightly obliquely with respect to the conveyance direction H of the sheet member 100 at a slight angle α shown in FIG. 11. Therefore, breakage of the sheet member 100 due to a cutting mark is prevented.

[0073] FIG. 12 is a diagram for explaining a state in which the pressing blade member 20 peels off the deposit 101 in a state where the deposit 101 adheres to the entire surface of the sheet member 100. According to the deposit removing device 2 of the second embodiment, not only the ladder-shaped deposit 101 but also the deposit 101 adhering to the entire surface of the sheet member 100 as shown in FIG. 12 can be effectively removed.

[0074] Then, the sheet member 100 from which the deposit 101 has been removed by the deposit removing device 2 is pulverized to form PET pellets, and by recycling the pellets as the sheet member 100, a method for recycling the sheet member 100 can be provided.

[0075] Further, a slurry to be a ceramic green sheet is applied in a sheet shape onto the sheet member 100 reproduced in this manner. Next, an electrode pattern is printed on the surface of the sheet member 100 onto which the ceramic green sheet is applied in a sheet shape. Then, the ceramic green sheet on which the electrode pattern is printed is cut into a rectangle and peeled off from the sheet member 100 using the sheet peeling device 200. The peeled ceramic green sheets 101c are laminated to form a mother block laminate 210. The mother block laminate 210 is cut into a predetermined size to obtain a plurality of laminate chips 220. Thereafter, an external electrode 310 is formed on the outer surface of the laminate chip 220, thereby providing a manufacturing method for manufacturing a multilayer ceramic capacitor 300 as an electronic component.

[0076] As described above, the preferred embodiments of the present invention have been described, but the present invention includes the following combinations. <1> A feeding mechanism for feeding a long sheet member, a winding mechanism for winding the sheet member fed by the feeding mechanism, a cutting edge having a cross-sectional shape that extends along a blade axis and is curved and orthogonal to the blade axis, and the cutting edge pressing the surface of the sheet member in a state where the cutting edge is directed upstream in the conveying direction of the sheet member, and a dust collecting mechanism for collecting deposits peeled off from the sheet member. The deposit removing device for the sheet member.

[0077] <2> The deposit removing device according to <1>, wherein a plurality of the pressing blade members are arranged side by side in the width direction of the sheet member.

[0078] <3> A plurality of rows of the pressing blade members arranged side by side in the width direction are arranged in a plurality of rows at different positions in the conveying direction, and other rows of the pressing blade members are arranged on the downstream side in the conveying direction between the pressing blade members adjacent to each other in one row. The deposit removing device according to <1>, wherein a region where the pressing blade members in one row press the sheet member and a region where the pressing blade members in the other row press the sheet member partially overlap in the width direction.

[0079] <4>The deposit removing device according to <1>, further comprising a back surface side air nozzle for blowing air to the back surface side of the sheet member on the upstream side in the conveyance direction of the sheet member from the pressing blade member.

[0080] <5>The feeding mechanism includes a feeding roll around which the sheet member is wound. Regardless of the amount of the sheet member wound around the feeding roll, the blowing position of the air of the back surface side air nozzle is variable so that the distance between the blowing position of the air and the sheet member on which the air is blown by the back surface side air nozzle is constant. The deposit removing device according to <4>.

[0081] <6>The air is jetted in a spiral shape from the back surface side air nozzle. The deposit removing device according to <4> or <5>.

[0082] <7>A method for removing deposits from a sheet member, comprising feeding out a long sheet member having deposits attached to its surface, pressing the surface of the sheet member with the cutting edge of a pressing blade member that extends along a blade axis and has a curved cross-sectional shape perpendicular to the blade axis with the cutting edge facing upstream in the conveyance direction of the sheet member to peel the deposits from the sheet member, collecting the deposits peeled from the sheet member, and winding up the sheet member from which the deposits have been peeled.

[0083] <8>A recycling method for a sheet member, comprising feeding out a long sheet member having deposits attached to its surface, pressing the surface of the sheet member with the cutting edge of a pressing blade member that extends along a blade axis and has a curved cross-sectional shape perpendicular to the blade axis with the cutting edge facing upstream in the conveyance direction of the sheet member to peel the deposits from the sheet member, collecting the deposits peeled from the sheet member, winding up the sheet member from which the deposits have been peeled, and pulverizing the sheet member from which the deposits have been removed to form pellets.

[0084] <9>Unroll a long sheet member with deposits adhering to its surface, and with the cutting edge of a pressing blade member having a cutting edge that extends along the blade axis and has a curved cross-sectional shape perpendicular to the blade axis facing upstream in the conveyance direction of the sheet member, press the surface of the sheet member with the cutting edge to peel off the deposits from the sheet member, collect the deposits peeled off from the sheet member, wind up the sheet member from which the deposits have been peeled off, crush the sheet member from which the deposits have been removed to form pellets, regenerate a long sheet member using the pellets, form a ceramic green sheet on the regenerated sheet member, and manufacture an electronic component using the ceramic green sheet. A method for manufacturing an electronic component.

Explanation of Signs

[0085] θ1 Bending angle θ2 Contact angle A Blade axis 1,2 Deposit removing device 2 Deposit removing device 20 Pressing blade member 20A Front row 20B Rear row 21 Cutting edge 100 Sheet member 101 Deposit 101a Longitudinal deposit 101b Widthwise deposit 101c Ceramic green sheet 110 Deposit removing section 120 Unrolling mechanism 121 Unrolling roll 122 Brake 122 Auxiliary roll 130 Winding-up mechanism 131 Winding-up roll 132 Auxiliary roll 140 Pressing member 150 Wide-area air nozzle 151 Jet outlet 160,160a,160b Partial air nozzle 161 Jet outlet 170 Back-side air nozzle 180 Dust collection mechanism 200 Sheet peeling device 300 Multilayer ceramic capacitor

Claims

1. A feeding mechanism for feeding a long sheet member, a winding mechanism for winding the sheet member fed by the feeding mechanism, having a cutting edge that extends along a cutting shaft and has a curved cross-sectional shape orthogonal to the cutting shaft, a pressing blade member that presses the surface of the sheet member only from below with the cutting edge facing the upstream side in the conveying direction of the sheet member, a dust collecting mechanism for collecting deposits that are residues of ceramic green sheets peeled off from the sheet member, and the pressing blade members are arranged in a plurality in the width direction of the sheet member, a plurality of rows of the pressing blade members arranged side by side in the width direction are arranged in a plurality of rows at different positions in the conveying direction, the pressing blade members of other rows are arranged on the downstream side in the conveying direction between the adjacent pressing blade members in one row, and an area where the pressing blade members of the one row press the sheet member and an area where the pressing blade members of the other rows press the sheet member partially overlap in the width direction, the cutting shaft is arranged obliquely with respect to the conveying direction of the sheet member, a back surface side air nozzle for blowing air is provided on the back surface side of the sheet member upstream of the pressing blade member in the conveying direction of the sheet member, the feeding mechanism includes a feeding roll around which the sheet member is wound, and the blowing position of the air is variable so that the distance between the blowing position of the air and the sheet member on which the air is blown by the back surface side air nozzle remains constant regardless of the amount of the sheet member wound around the feeding roll, An apparatus for removing deposits from the sheet member.

2. the cutting shaft is arranged obliquely so as to incline in the horizontal direction with respect to the conveying direction of the sheet member, The deposit removing apparatus according to Claim 1.

3. the air is jetted in a spiral shape from the back surface side air nozzle, The deposit removing apparatus according to Claim 1.

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