Apparatus for peeling off remaining layers from waste plastic film, apparatus for recycling waste plastic film using said apparatus, and methods for recycling

Abstract

To provide a technology for quickly peeling off remaining layers of waste plastic films discharged in the process of manufacturing multilayer ceramic capacitors without using chemicals. [Solution] The device is equipped with a drive mechanism (100c) that advances a roll of waste plastic film (400) from the upstream side to the downstream side of the device, a blow mechanism (100a) that, during the advancement, blows air at a predetermined angle against the side of the removed sheet of waste plastic film (400) on which the remaining layer is formed, thereby blowing off the remaining layer, and a scraping mechanism (100b) that is positioned downstream of the blowing mechanism (100a) and scrapes off the remaining layer that could not be peeled off by the blowing mechanism (100a) by adhering both sides of the sheet of waste plastic film (400) and sliding them against the blade surfaces of multiple plate-shaped blades (121, 122, 123) that are arranged alternately above and below at least once.

Description

[Technical Field]

[0001] The present invention relates to the recycling of waste plastic films, and more particularly to the recycling of waste plastic films discharged during the manufacture of multilayer ceramic capacitors (MLCCs). [Background technology]

[0002] The manufacturing process for multilayer ceramic capacitors (MLCCs) begins when the raw ceramic dielectric powder is mixed with binders and other materials to form a slurry (paste). Because the slurry cannot maintain its shape on its own, it is spread into a thin sheet on a plastic carrier film (base film) and then dried. After that, electrodes and other components are printed, and the multilayer ceramic capacitor is completed after going through processes such as shredding, lamination, pressure application, and firing.

[0003] The plastic carrier film (base film) that appears in this process has no use after the dried slurry is removed. In particular, the dried slurry and parts of the printed electrodes (containing precious metals such as nickel) remain on the film as residual layers, which hinder the reuse of the carrier film. As a result, the current situation is that it has no choice but to be disposed of as overtime waste (waste plastic film).

[0004] In this context, there has been a movement to reuse this waste plastic film (see Non-Patent Document 1). The technology described in Non-Patent Document 1 involves passing waste plastic film with a residual layer (residual slurry, etc.) through a liquid containing chemicals to dissolve and remove the residual layer. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] PR TIMES "The project to promote the recycling of PET film (with slurry) was selected for the second public offering of the 'Waste Plastic Resource Recycling Advanced Project (Ministry of Economy, Trade and Industry)!!" Page URL: https: / / prtimes.jp / main / html / rd / p / 000000006.000057542.html Summary of the Invention [Problem to be solved by the invention]

[0006] However, the technology described in Non-Patent Document 1 not only requires a large amount of chemicals to dissolve the remaining layer, but also results in the accumulation of the chemicals themselves as waste. Another disadvantage is that the use of liquids makes the treatment time-consuming.

[0007] The present invention has been made to solve these problems, and its objective is to provide a technology that can quickly peel off the remaining layers of waste plastic film that is generated in the process of manufacturing multilayer ceramic capacitors (MLCCs) without using chemicals. [Means for solving the problem]

[0008] In order to solve the above problem, the present invention is an apparatus for peeling off a residual layer from a waste plastic film discharged during the manufacturing process of a multilayer ceramic capacitor (MLCC), and is characterized by comprising: a drive mechanism for advancing a single piece of waste plastic film taken out of the waste plastic film wound into a roll from the upstream side to the downstream side of the apparatus; a blow mechanism for blowing air at a predetermined angle against the side of the taken-out waste plastic film on which the residual layer is formed, to blow off the residual layer, during the advancement; and a scrubbing mechanism arranged downstream of the blowing mechanism, which scrapes off the residual layer that could not be peeled off by the blowing mechanism by advancing both sides of the single piece of waste plastic film so that the blade surfaces of a plurality of plate-shaped blades arranged alternately up and down or / and left and right slide against each other at least once.

[0009] By adopting this configuration, it is possible to quickly peel off the remaining layer on the waste plastic film without using chemicals. The inventor discovered that the remaining layer could be peeled off by blowing air, and by adjusting the angle and amount of air, it became possible to peel off the remaining layer to a sufficient degree. In particular, since no chemicals are used to remove the remaining layer, there is no cost involved and the problem of these chemicals accumulating as further waste is fundamentally solved. Furthermore, since there is no need to soak the film in liquid and dry it, processing time can be significantly reduced.

[0010] The remaining layer blown off by the blowing mechanism is sucked and collected by a suction mechanism.

[0011] By adopting such a configuration, it is possible to recover and reuse the precious metals (nickel, etc.) contained in the remaining layer.

[0012] Furthermore, the blowing mechanism is characterized in that it is positioned on the underside of the removed plastic film and discharges air downward (forming an angle of θ1) from the horizontal direction when the removed plastic film moves diagonally upward.

[0013] This configuration allows the remaining layer to be effectively peeled off. That is, the air hits the waste plastic film at an acute angle (θ2) as it moves diagonally upward from the upstream side to the downstream side, effectively lifting the remaining layer. In addition, this positional relationship makes it difficult for the peeled remaining layer to come into contact with the film again.

[0014] The scraping mechanism is characterized in that a plurality of the plate-shaped blades are provided to come into close contact with the surface of the waste plastic film on which the remaining layer is present.

[0015] By adopting such a configuration, even if a residual layer occurs that cannot be removed even by the blowing mechanism, or even if a residual layer that has been peeled off by the blowing mechanism unintentionally reattaches, the residual layer can be reliably scraped off (scrubbed away).

[0016] The present invention can also be seen as a recycling device for waste plastic film, which includes a shredding device that shreds the waste plastic film into a predetermined shape after the remaining layer has been peeled off by the waste plastic film remaining layer peeling device described in claims 1 to 4, and a melting device that melts the shredded waste plastic film.

[0017] Furthermore, from another perspective, the present invention can also be seen as a method for peeling off a remaining layer from a waste plastic film discharged during the manufacturing process of multilayer ceramic capacitors (MLCCs), comprising the steps of: advancing a sheet of waste plastic film taken out of the waste plastic film wound into a roll from the upstream side to the downstream side of the device; during this advancement, blowing air at a predetermined angle against the side of the taken-out waste plastic film on which the remaining layer is formed, thereby blowing off the remaining layer; and scraping off the remaining layer that could not be peeled off by the blow mechanism by advancing both sides of the sheet of waste plastic film so that the blade faces of a plurality of plate-shaped blades arranged alternately up and down or / and left and right slide against each other while in close contact with each other at least once. [Effects of the Invention]

[0018] By applying this invention, it is possible to provide a technology for quickly peeling off the remaining layers of waste plastic film discharged during the process of manufacturing multilayer ceramic capacitors (MLCCs) without using chemicals. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a diagram showing a processing procedure of a waste plastic film recycling device including a residual layer peeling device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a schematic diagram of a remaining layer peeling device. [Figure 3] FIG. [Figure 4] 1 is a photograph showing an example of waste plastic film before processing. [Figure 5] 1 is a photograph showing an example of waste plastic film after processing. DETAILED DESCRIPTION OF THE INVENTION

[0020] Below, a description will be given of a remaining layer peeling apparatus 100, which is one example of an embodiment of the present invention, with reference to the accompanying drawings. It should be noted that in order to make the drawings easier to understand, the size and dimensions of each part are exaggerated and may not necessarily correspond to the actual product. Each drawing should be viewed in accordance with the direction of the reference numerals, and the top, bottom, left, right, front, and back are expressed based on these directions.

[0021] <Configuration of Remaining Layer Peeling Device> 1 is a diagram showing the processing procedure of a waste plastic film recycling device 10 including a remaining layer peeling device 100. As shown in the figure, in the waste plastic film recycling device 10, after the remaining layer is peeled off by the remaining layer peeling device 100, the waste plastic film is shredded into a predetermined shape by a shredding device 200, and the shredded waste plastic film is further melted by a melting device 300, thereby recycling the waste plastic film. The remaining layer peeling device 100 will be particularly described below.

[0022] As shown in Figure 2, the residual layer peeling device 100 is an apparatus for peeling residual layers from waste plastic film 400-1 discharged during the process of manufacturing multilayer ceramic capacitors (MLCCs), and is equipped with a blowing mechanism 100a, a scraping mechanism 100b, and a driving mechanism 100c.

[0023] A single piece of waste plastic film 400 taken out from the rolled-up waste plastic film 400-1 is driven by the drive mechanism 100c from the upstream side to the downstream side of the device (in Figure 2, the right side is the upstream side and the left side is the downstream side) and moves forward (symbol 400-2 is the waste plastic film after the peeling process).

[0024] The blowing mechanism 100a is configured to blow air from a plurality of air pipes 110 at a predetermined angle to the surface 400a of the removed sheet of waste plastic film 400 on which the remaining layer 410 (see FIG. 3) is formed, thereby blowing off the remaining layer 410. The sheet of waste plastic film 400 is guided by a plurality of rollers 101, 102, 103, etc.

[0025] A scraping mechanism 100b equipped with three plate-shaped blades 121, 122, and 123 is disposed downstream of the blowing mechanism 100a. In this embodiment, the three plate-shaped blades 121, 122, and 123 are disposed alternately up and down. Specifically, the first plate-shaped blade 121 faces upward, the second plate-shaped blade 122 faces downward, and the third plate-shaped blade 123 faces upward again. As shown in FIG. 2, both sides of the waste plastic film 400 slide against the blade surfaces of the plate-shaped blades at least once each, thereby scraping off the remaining layer 410 that could not be peeled off by the blowing mechanism 100a.

[0026] The waste plastic film 400 from which the remaining layer 410 has been completely removed by the scraping mechanism 100b is wound up and collected by the driving mechanism 100c.

[0027] <Actions and Functions of the Remaining Layer Peeling Device> First, a rolled up waste plastic film 400-1 (FIG. 4) before the peeling process is set on the upstream side of the remaining layer peeling device 100. Then, one piece of waste plastic film 400 is taken out by hand and passed through rollers 101, 102, etc. in a predetermined order. At this time, it is carefully placed so that the surface 400a on which the remaining layer 410 will be formed faces the air pipe 110. Finally, the one piece of waste plastic film 400 pulled out by hand is attached to the driving device 100c located at the most downstream side.

[0028] When the power supply of the remaining layer peeling device 100 is turned on in this state, the drive device 100c is driven and begins winding. Accordingly, the waste plastic film 400 flows (advances) sequentially from the upstream side to the downstream side. At the same time, a predetermined amount of air is blown out from the blow mechanism 100a (air pipe 110). This causes the remaining layer 410 remaining on the waste plastic film 400 to peel off. The peeled remaining layer 410 is sucked and collected by a suction mechanism (not shown).

[0029] After passing through the blowing mechanism 100a, the waste plastic film 400 flows through the scrubbing mechanism 100b, which is located downstream of the blowing mechanism 100a. Even if there is any remaining layer 410 that was not sufficiently removed by the blowing mechanism 100a or any remaining layer 410 that unintentionally reattached after removal, it is scraped off by the scrubbing mechanism 100b. In particular, in this embodiment, the surface 400a on which the remaining layer 410 is formed is scraped twice using two plate-shaped blades (the first plate-shaped blade 121 and the third plate-shaped blade 123), so that all of the remaining layer 410 can be removed. Furthermore, the surface 410b on which the remaining layer 410 is not originally formed is also scraped off (just to be safe) by the second plate-shaped blade 122. Therefore, even if the remaining layer 410 accidentally adheres to the surface 410b on which the remaining layer 410 is not formed during the flow process, it is completely removed at that location.

[0030] As described above, the present invention is an apparatus for peeling off a residual layer 410 from a waste plastic film 400 discharged during the manufacturing process of a multilayer ceramic capacitor (MLCC), and is characterized by comprising: a drive mechanism 100c that advances a single piece of waste plastic film 400 taken out of a roll of waste plastic film 400-1 from the upstream side to the downstream side of the apparatus; a blow mechanism 100a that, during the advancement, blows air at a predetermined angle against the surface 400a of the taken-out waste plastic film 400 on which the residual layer 410 is formed, thereby blowing off the residual layer; and a scrubbing mechanism 100b that is arranged downstream of the blow mechanism 100a and scrapes off the residual layer 410 that could not be peeled off by the blow mechanism 100a by sliding both sides of the single piece of waste plastic film 400 in close contact with each other at least once each over the blade surfaces of a plurality of plate-shaped blades 121, 122, 123 arranged alternately above and below.

[0031] By adopting this configuration, it is possible to quickly peel off the remaining layer 410 on the waste plastic film 400 without using chemicals or the like. The inventor discovered that the remaining layer 410 could be peeled off by blowing air, and by adjusting the angle and amount of air, it became possible to peel off the remaining layer 410 to a sufficient degree. In particular, since no chemicals or the like are used to remove the remaining layer 410, there is no cost involved and the problem of these chemicals accumulating as further waste is fundamentally solved. Furthermore, since there is no need to soak the film in liquid and dry it, the processing time can be significantly reduced.

[0032] Furthermore, the remaining layer 410 blown off by the blow mechanism 100a is sucked and collected by a suction mechanism (not shown).

[0033] By adopting such a configuration, it is possible to recover and reuse the precious metals (nickel, etc.) contained in the remaining layer 410.

[0034] In addition, the blowing mechanism 100a is characterized in that it is positioned on the underside of the plastic film 400 when the removed plastic film 400 moves diagonally upward, and discharges air downward (forming an angle of θ1) from the horizontal (see Figure 3).

[0035] By adopting such a configuration, it is possible to effectively peel off the remaining layer 410. That is, the air hits the waste plastic film 400 at an acute angle (θ2) as it moves diagonally upward from the upstream side to the downstream side, making it possible to efficiently lift off the remaining layer 410. In addition, due to this positional relationship, it is difficult for the peeled remaining layer 410 and the film 400 to come into contact with each other again.

[0036] The scraping mechanism 100b is characterized by being provided with a plurality of plate-shaped blades that come into close contact with the surface 400a of the waste plastic film 400 on which the remaining layer 410 exists.

[0037] By adopting such a configuration, even if a residual layer 410 occurs that cannot be removed even by the blow mechanism 100a, or even if the residual layer 410 that has been peeled off by the blow mechanism 100a unintentionally reattaches to the film 400, the residual layer 410 can be reliably scraped off (scrubbed away).

[0038] <Other configuration examples> In the above description, the plate-like blades of the scraping mechanism 100b are arranged alternately up and down, but this is not limiting, and the same effect can be achieved even if they are arranged alternately left and right, for example.

[0039] In this specification, the plastic film is mainly intended to refer to PET film, but the concept also includes a wide range of plastic films, such as PP (polypropylene) film, NY (nylon) film, and PE (polyethylene) film. [Explanation of symbols]

[0040] 10. Waste plastic film recycling device 100 Remaining layer peeling device 100a···Blow mechanism 100b...Abrasion mechanism 100c···Drive mechanism 101, 102, 103, 104, 105... Roller 110···Air pipe (outlet) 121 First blade 122 Second blade 123 Third blade 200 Shredding equipment 300 Melting equipment 400···Waste plastic film 400a: Surface on which the remaining layer is formed 400b: Surface without remaining layer 400-1: Rolled up waste plastic film before peeling 400-2: Rolled waste plastic film after peeling treatment 410...Residual layer

Claims

1. An apparatus for peeling off remaining layers from waste plastic films discharged in the process of manufacturing multilayer ceramic capacitors (MLCCs), a drive mechanism for moving a sheet of waste plastic film taken out of the roll of waste plastic film from the upstream side to the downstream side of the device; During the process, a blowing mechanism blows air at a predetermined angle against the surface of the removed sheet of waste plastic film on which the remaining layer is formed to blow off the remaining layer; and a scraping mechanism that is disposed downstream of the blowing mechanism and scrapes off the remaining layer that could not be peeled off by the blowing mechanism by sliding both sides of the waste plastic film against the blade surfaces of a plurality of plate-like blades that are arranged alternately up and down or / and left and right, while being in close contact with each other at least once. The blowing mechanism is disposed on the underside of the removed plastic film when the plastic film moves diagonally upward, and discharges air downward from the horizontal direction. An apparatus for peeling off remaining layers from waste plastic films.

2. In claim 1, The remaining layer blown off by the blowing mechanism is sucked and collected by the suction mechanism. An apparatus for peeling off remaining layers from waste plastic films.

3. In claim 1, The scraping mechanism is provided with a plurality of plate-shaped blades that are in close contact with the surface of the waste plastic film on which the remaining layer is present. An apparatus for peeling off remaining layers from waste plastic films.

4. A waste plastic film recycling device comprising: a shredding device that shreds the waste plastic film into a predetermined shape after the remaining layer has been peeled off by the waste plastic film remaining layer peeling device described in claims 1 to 3; and a melting device that melts the shredded waste plastic film.

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