TWI781540B - Release film roll, ceramic part sheet and method for producing the same, and ceramic part and method for producing the same - Google Patents

Abstract

The present invention provides a release film roll comprising a release film having a base film and a release layer, and a core around which the release film is wound, wherein the surface roughness (Rp) of the outer peripheral surface of the core is 1.5 μm or less. The present invention provides a method for manufacturing a ceramic component sheet, which has a step of forming a ceramic green sheet using a slurry containing ceramic powder on the surface of a peeling layer of a peeling film pulled out from a peeling film roll.

Description

Release film roll, ceramic part sheet and method for manufacturing same, and ceramic part and method for manufacturing same

The present invention relates to a peeling film roll, a ceramic part sheet and its manufacturing method, and a ceramic part and its manufacturing method.

In recent years, electronic components have also become more and more miniaturized as electronic equipment has been increasingly required to be miniaturized. Ceramic parts, which are one type of electronic parts, are also being miniaturized year by year. For example, in a multilayer ceramic capacitor, which is one type of ceramic components, the thickness of the dielectric layer and internal electrodes is reduced to increase the capacity. A general laminated ceramic capacitor is manufactured by using a release film as a carrier film, forming a dielectric layer and internal electrodes on the carrier film to form a green sheet, and peeling the green sheet to build layers.

When the thickness of the dielectric layer of the laminated ceramic capacitor becomes thinner, there is a tendency for the withstand voltage performance, which indicates durability under the voltage intensity at which troubles such as short circuits occur, to decrease. Especially when the thickness of the dielectric layer is not uniform, the thinner part becomes a factor of lowering the withstand voltage performance. A multilayer ceramic capacitor having a dielectric layer having such a thin portion has a poor withstand voltage, and the yield of the multilayer ceramic capacitor decreases. On the other hand, if the thickness of the dielectric layer is uniform, the withstand voltage performance is good, and the yield rate of the laminated ceramic capacitor is improved.

If there are wrinkles, creases, etc. in the release film used as the carrier film of the dielectric layer, it will cause thickness variation. Also, the smoothness of the release film surface affects the uniformity of the thickness of the dielectric layer. Under such circumstances, for example, in Patent Document 1, a release film roll capable of smoothing a release film and reducing thickness unevenness of a dielectric layer is studied. prior art literature patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2011-206995

[Problem to be solved by the invention]

In the manufacturing process of ceramic parts, a ceramic green sheet is formed on a release film drawn from a roll of release film. Here, as a method for improving the productivity of ceramic parts, it is considered effective to lengthen the winding length of the release film wound as a release film roll and reduce the replacement frequency of the release film roll. However, if the winding length of the release film is increased, the release film roll will increase in size, and the inner part of the release film roll, that is, the pressure on the release film near the winding core will increase.

Therefore, if a protrusion (protrusion) exists in a core, the protrusion shape of a core will be transferred to the peeling film near a core. In the case of a thinner ceramic green sheet, the shape of such transferred protrusions becomes a factor of variation in the thickness of the ceramic green sheet. Although the thickness variation will be improved as the distance away from the core, but due to the large deformation of the peeling film near the core, the thickness of the ceramic green sheet varies greatly. In order to suppress the thickness variation of the ceramic green sheet, it is not used Countermeasures such as discarding. If the release film that has not been effectively utilized can be utilized, the release film can be effectively used, and the replacement frequency of the release film roll can be reduced, thereby improving the production efficiency of various products such as ceramic green sheets and ceramic parts.

Therefore, this invention provides the peeling film roll which can utilize a peeling film effectively up to the vicinity of a winding core. Moreover, this invention provides the manufacturing method which can manufacture a ceramic part sheet|seat and a ceramic part with high production efficiency by using such a release film roll. Also, the present invention provides a ceramic component sheet and a ceramic component excellent in reliability. [Technical means to solve the problem]

The release film roll according to an aspect of the present invention is provided with a release film having a base film and a release layer, and a core on which the release film is wound, and the surface roughness (Rp) of the outer peripheral surface of the core is 1.5 μm or less .

The protrusion on the outer peripheral surface of the core has a great influence on the deformation of the release film at the inner part of the release film roll, that is, the part near the core. In the above-mentioned release film roll, the surface roughness (Rp) of the outer peripheral surface of the core is 1.5 μm or less, so even if the winding length becomes longer and the pressure applied to the release film inside becomes larger, the surface roughness (Rp) near the core can be suppressed. The release film is deformed to reduce the thickness variation of the release film. Therefore, even if it lengthens the winding length of a peeling film, a peeling film can be utilized effectively up to the vicinity of a core.

Furthermore, the surface roughness (Rp) represents the height of the highest protrusion (protrusion) in the roughness curve obtained by measuring the outer peripheral surface of the winding core. If there is even one large protrusion on the outer peripheral surface of the core, the shape will be transferred to the release film by the protrusion, and the deformation of the release film near the core will be significant, resulting in a large change in the thickness of the ceramic green sheet. On the other hand, the depressions on the outer peripheral surface of the core are more difficult to transfer the shape to the release film than the protrusions. Therefore, as the surface roughness of the above-mentioned core, peeling near the core can be reduced by specifying Rp (maximum protrusion height) instead of Ra (arithmetic mean roughness) and Rv (maximum concave depth) to be a specific value or less Deformation of the membrane.

The thickness variation range in the width direction of the release film wound up on the core may be 0.5 μm or less. If the thickness variation in the width direction of the release film is 0.5 μm or less, the pressure difference due to the difference in thickness becomes smaller, thereby further suppressing the deformation of the release film. Especially in the case of a release film roll with a large roll diameter, the effect of suppressing deformation is greater.

The core may comprise fiber reinforced plastic. Thereby, the smoothness of the surface of the winding core can be improved, and the mechanical strength of the winding core can be improved. Therefore, generation of wrinkles, creases, and the like on the release film due to deformation of the winding core can be sufficiently suppressed. Furthermore, fiber reinforced plastics are sometimes referred to as FRP (Fiber Reinforced Plastics, fiber reinforced plastics) or FWD (Fiber Winding Plastics, fiber wound plastics).

The outer diameter of the core can be less than 170 mm. Since the roll of the release film is wound, shape transfer from the core periodically occurs at intervals of the circumference length corresponding to the circumference length corresponding to the diameter of the winding release film. This gap becomes narrower as the outer diameter of the winding core becomes smaller. The transfer of the protrusion shape of the core tends to become smaller as the release film is wound away from the core. The transfer interval of the protrusion shape becomes narrower when the core is smaller. Therefore, the length of the release film for producing the transfer of the protrusion shape becomes shorter when the core is smaller. Therefore, the length of the release film that has to be discarded along with the transfer can be shortened. Also, the size of the release film roll can be reduced, thereby reducing installation space and transportation costs.

The length of the release film wound on the core can be more than 4000 m. When the length of the peeling film becomes longer, the pressure applied to the peeling film near the core becomes larger, and thus is easily affected by the protrusions on the outer peripheral surface of the core. Since the height of the protrusions on the outer peripheral surface of the release film roll is sufficiently small, deformation of the release film can be suppressed even if the length of the release film is increased. Therefore, the replacement frequency of the release film roll can be reduced, and the production efficiency of various products such as ceramic green sheets and ceramic parts can be fully improved.

A method of manufacturing a ceramic component sheet according to an aspect of the present invention has a step of forming a ceramic green sheet on the surface of a release layer of a release film drawn from any of the release film rolls using a slurry containing ceramic powder.

The above-mentioned production method uses a release film drawn from any one of the above-mentioned release film rolls. The above-mentioned release film can form a ceramic green sheet, and the variation of the thickness of the ceramic green sheet near the winding core is also reduced. Therefore, the release film near the winding core can be effectively utilized to manufacture a ceramic component sheet having a ceramic green sheet with reduced thickness variation. In this way, the release film near the winding core can also be utilized to manufacture ceramic component sheets, so the production efficiency of ceramic component sheets can be improved.

In the step of forming the above-mentioned ceramic green sheet, the ceramic green sheet may also be formed in a part within 300 m from the rear end of the release film pulled out from the release film roll. Even so, it is possible to manufacture a ceramic green sheet with suppressed variation in thickness by using a release film near the winding core. Thereby, the manufacturing cost of the ceramic green sheet can be substantially reduced. The "rear end" of the release film in the present invention refers to the end installed on the side of the core, and the "front end" of the release film refers to the end present on the side of the outer peripheral surface of the release film roll.

A method of manufacturing a ceramic part according to an aspect of the present invention has the steps of obtaining a laminated body including a ceramic green sheet using the ceramic part sheet obtained by the above-mentioned manufacturing method; and firing the laminated body to obtain a sintered body. This manufacturing method can also make use of the release film near the winding core to manufacture ceramic parts. Therefore, the production efficiency of ceramic parts can be improved.

The ceramic component sheet according to an aspect of the present invention can be obtained by forming a green sheet including a ceramic green sheet on the surface of a release layer of a release film drawn from any of the above-mentioned release film rolls.

The above-mentioned ceramic component sheet can be obtained using a release film drawn from any of the above-mentioned release film rolls. Since the peeling film is suppressed in thickness variation, the thickness variation of the green sheet of the ceramic component sheet is suppressed, and is excellent in reliability. In addition, the release film near the winding core can be used for production, so the yield rate can be improved.

A ceramic component according to an aspect of the present invention is provided with a sintered body, the sintered system forms a laminate of ceramic green sheets including the above-mentioned ceramic component sheet, and the laminate is obtained by firing the laminate. The variation in the thickness of the above-mentioned ceramic green sheet is suppressed, so the reliability of the above-mentioned ceramic part is excellent. Also, the ceramic green sheet produced by using the release film near the winding core can be used, so the yield can be improved. [Effect of Invention]

According to this invention, even if it lengthens the winding length of a peeling film, the peeling film roll which can utilize a peeling film effectively up to the vicinity of a winding core can be provided. Moreover, this invention can provide the manufacturing method which can manufacture a ceramic part sheet|seat and a ceramic part with high production efficiency by using such a release film roll. Also, the present invention can provide a ceramic component sheet and a ceramic component excellent in reliability.

Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. In each drawing, the same symbols are attached to the same or equivalent elements, and repeated explanations are omitted as appropriate. However, the following embodiments are examples for describing the present invention, and are not intended to limit the present invention to the following.

Fig. 1 is a perspective view of a release film roll according to an embodiment. The peeling film roll 100 of FIG. 1 is equipped with the peeling film 20 which has a base film and a peeling layer, and the core 10 by which the peeling film 20 was wound. The release film 20 is used, for example, as a carrier film in a manufacturing step of a ceramic part typified by a laminated ceramic capacitor. In this manufacturing step, for example, a ceramic green sheet to be a dielectric sheet and an electrode green sheet to be an internal electrode are formed by coating or printing on a release film, and then these are peeled off and laminated, and the The laminate is calcined to manufacture ceramic parts. The release film 20 is used after being pulled out from the release film roll 100 .

Examples of the material of the core 10 include paper, plastic, metal, and the like. Particles can cause pinholes in the manufacture of ceramic parts, so it is preferable to include lightweight plastics that do not generate paper dust. Examples of such materials include ABS resin, Bakelite, and fiber-reinforced plastic. Among them, the ABS resin may be deformed after being used once, and the roundness may be reduced.

On the other hand, since fiber reinforced plastic and Bakelite have higher mechanical strength, the core 10 can be reused. In this way, since it can be used repeatedly as the winding core 10, industrial waste can be reduced and resources can be effectively utilized. Moreover, when the winding length of the peeling film 20 is lengthened, deformation|transformation of the winding core 10 can fully be suppressed. Among fiber-reinforced plastics and bakelite, fiber-reinforced plastics are particularly preferable because they have flexibility in addition to high mechanical strength. Examples of fiber-reinforced plastics include those in which fibers are reinforced with a thermosetting resin.

The winding core 10 is a cylinder, and the surface roughness (Rp) of the outer peripheral surface is 1.5 μm or less. The surface roughness (Rp) of the winding core 10 is preferably 1.0 μm or less, more preferably 0.6 μm or less. If the surface roughness (Rp) is greater than 1.5 μm, the protrusions (protrusions) on the outer peripheral surface of the core 10 will press against the release film 20 to transfer the shape of the protrusions, and the release film 20 will be deformed. As a result, in the release film roll in which the release surface (surface of the release layer) of the release film 20 is wound outward, the release surface side is deformed into a convex shape. On the other hand, in the release film roll in which the release surface was wound inward, the release surface was deformed into a concave shape. In a multilayer ceramic capacitor manufactured using such a release film 20, the thickness of the dielectric layer is uneven, resulting in a drop in withstand voltage where the thickness of the dielectric layer is small, and a drop in capacitance where the thickness of the dielectric layer is large. On the other hand, if the surface roughness (Rp) of the outer peripheral surface of the winding core 10 becomes small, the protrusion will become small, and the deformation|transformation of the peeling film 20 can be suppressed. As a result, the reliability of the multilayer ceramic capacitor manufactured using the release film 20 can be improved.

The surface roughness (Rp) and surface roughness (Rv) of the core 10 are "maximum protrusion height" and "maximum depression height" stipulated in JIS (Japanese Industrial Standards) B 0601-2001. Such surface roughness can be measured using a contact surface roughness meter.

The surface roughness (Rp) of the outer peripheral surface of the winding core 10 can be reduced by densely cutting the outer peripheral surface. For example, in the case of manufacturing the core 10 made of fiber-reinforced plastic, first, resin-impregnated fibers are wound around a mandrel, and then a resin sheet is wound as needed. The resin may be applied instead of winding the resin sheet. Next, after heating to harden the resin with heat or the like, the mandrel is removed to obtain a bare tube to be a winding core.

As resin, epoxy resin, unsaturated polyester resin, etc. are mentioned. Examples of the fibers include glass fibers, aramid fibers, and the like. In consideration of cost and the like, the resin is preferably an unsaturated polyester resin. From the same viewpoint, glass fibers are preferable as fibers.

Next, cutting is performed using a lathe or the like to smooth the outer peripheral surface of the bare pipe. For example, the surface roughness (Rp) of the outer peripheral surface can be reduced by slowing down the feed speed of the turning tool. Furthermore, by performing grinding (for example, finishing grinding) using grinding paper or a grinding liquid containing grinding materials, the surface roughness (Rp) of the outer peripheral surface can be sufficiently reduced. Grinding can be carried out with coarse-grit abrasive paper or coarse-grit abrasives, or can be gradually changed from coarse-grit abrasive paper or abrasives to fine-grit abrasive paper or abrasives. By performing such grinding, the surface roughness (Rp) of the outer peripheral surface can be reduced.

Cut surface-treated bare tubes to specific lengths. If necessary, it can be processed by removing the burr of the cut surface. In addition, by removing chips (foreign matter) generated during cutting, grinding, and cutting, the generation of pinholes in the ceramic green sheet can be suppressed.

Fig. 2 is a sectional view showing an example of a section of a release film. The release film 20 has a base film 22 and a release layer 24 on one surface thereof. The base film 22 may be a synthetic resin film. Examples of synthetic resins include polyolefin resins such as polyester resins, polypropylene resins, and polyethylene resins, acrylic resins such as polylactic acid resins, polycarbonate resins, and polymethyl methacrylate resins, polystyrene resins, and nylon. Polyamide resin, polyvinyl chloride resin, polyurethane resin, fluorine resin, polyphenylene sulfide resin, etc. Among these, polyester resin is preferable. Among the polyester resins, polyethylene terephthalate (PET, polyethylene terephthalate) is more preferable in view of mechanical properties, transparency, cost, and the like.

The thickness of the base film 22 is preferably 10-100 μm, more preferably 20-50 μm. When the thickness is less than 10 μm, physical properties such as dimensional stability of the release film 20 tend to be impaired. When the thickness exceeds 100 μm, the manufacturing cost per unit area of the release film 20 tends to increase.

From the viewpoint of sufficiently improving the mechanical strength of the release film 20, the base film 22 may contain a filler (filler) to such an extent that the transparency is not impaired. The filler is not particularly limited, and examples thereof include calcium carbonate, calcium phosphate, silica, kaolin, talc, titanium oxide, fumed silica, alumina, and organic particles.

When using a polyester film as the base film 22, it can manufacture in the following procedure. First, the molten polyester is cast into a cooling drum using an extruder. Molten polyester is extruded from a nozzle formed with a slit. After cooling, it was peeled off from a cooling drum to obtain an unstretched polyester film. As long as the gap between the slits of the extruder is adjusted, the thickness and variation range of the polyester film can be adjusted.

Next, the unstretched polyester film is stretched to adjust to a desired thickness, and mechanical strength is imparted. The stretching of the polyester film is preferably performed by biaxial stretching. In this case, after longitudinal stretching, lateral stretching is performed. The stretching temperature at the time of stretching is preferably not lower than the glass transition temperature of the polyester film and not higher than the melting temperature. The longitudinal extension and the lateral extension can be extended several times respectively. The thickness variation of the unstretched film is also continued after stretching. Therefore, by controlling the thickness variation of the unstretched film, the thickness variation range of the base film 22 and the release film 20 can be adjusted.

The release layer 24 is formed by applying a solution containing a release agent to one surface of the base film 22, drying and curing it. The coating method is not particularly limited, and reverse coating method, gravure coating method, rod coating method, bar coating method, Meyer rod coating method, die coating method, spray coating method, etc. are used. That's it. For drying, hot air drying, infrared drying, natural drying, etc. can be used. In order to suppress moisture condensation during drying, heating is preferred, and it may be about 60 to 120°C.

Examples of the release agent for forming the release layer 24 include silicone-based release agents, long-chain alkyl-based release agents, fluorine-based release agents, and amino alkyd resin-based release agents. Silicone release agents include addition reaction type silicone release agents, condensation reaction type silicone release agents, and ultraviolet curing type release agents depending on the curing reaction.

The curing conditions may be appropriately selected according to the curing system of the release agent. For example, if the release agent is an addition reaction silicone, it can be hardened by heat treatment at 80 to 130° C. for tens of seconds. In the case of an ultraviolet curing system, it can be cured by irradiating ultraviolet light with a mercury lamp, a metal halide lamp, etc. as a light source. When irradiating ultraviolet rays to perform radical polymerization, it is preferable to perform curing in a nitrogen atmosphere in order to prevent oxygen inhibition. It is preferable that the variation range of the thickness of the peeling layer 24 is small.

Addition reaction silicone release agent is made by introducing vinyl group into the terminal and/or side chain of polydimethylsiloxane, reacting with hydrogen siloxane to harden. Hardening can use a platinum catalyst. For example, it can be cured for tens of seconds to several minutes at a curing temperature of about 100°C. The thickness of the release layer 24 may be about 50-300 nm. Examples of addition reaction-based release agents include KS-847, KS-847T, KS-776L, KS-776A, KS-841, KS-774, KS-3703T, and KS-3601 manufactured by Shin-Etsu Chemical Co., Ltd. (both trade names).

The release layer 24 may include, for example, a hardened product of a (meth)acrylate component and a (meth)acrylate-modified silicone. This cured product can be cured by ultraviolet rays, so the thickness of the peeling layer 24 can be increased. Therefore, for example, when the base film 22 contains a filler, the protrusion by a filler can be covered and the surface of the peeling layer 24 can be made smooth. In this case, the thickness of the release layer 24 may be 300 to 3000 nm.

(Meth)acrylate monomers and (meth)acrylate-modified silicone oils that are incompatible with each other can also be used. These are mixed with a reaction initiator in a solvent, and after coating on the base film 22, the solvent is dried. In this way, the peeling layer 24 can also be formed by hardening by ultraviolet rays in a state where the silicone-modified silicone oil is positioned near the surface. Known ones can be used as the (meth)acrylate-modified silicone oil. For example, X-22-164A, X-22-164B, X-22-174DX, X-22-2445 (all are brand names) etc. manufactured by Shin-Etsu Chemical Co., Ltd. are mentioned.

The surface (release surface) of the release layer 24 of the release film 20 is preferably smooth. Specifically, the surface roughness (Rp) of the release layer 24 is preferably 100 nm or less, more preferably 50 nm or less. The surface roughness (Rp) of the release layer 24 in this embodiment is the maximum protrusion height specified in JIS B 0601-2001, and can be measured using a known surface roughness meter such as a scanning white interference microscope or a contact type.

The thickness variation range of the release film 20 in the width direction is preferably at most 0.5 μm, more preferably at most 0.4 μm, and still more preferably at most 0.3 μm. Most preferably, it is 0.2 μm or less. By reducing the fluctuation range, when the release film 20 is wound around the core 10 to form the release film roll 100, the pressure difference caused by the difference in the thickness of the release film 20 becomes smaller, thereby sufficiently suppressing the pressure difference near the core 10. The release film 20 is deformed.

In this invention, when unwinding and winding up a peeling film, the direction which conveys a peeling film is called a longitudinal direction, and the direction orthogonal to the longitudinal direction of a peeling film is called the width direction of a peeling film. The variation range of the thickness of the release film in the width direction of the present invention is the difference between the maximum value and the minimum value of the release film thickness between the two ends of the release film 20 in the width direction. It is obtained as follows.

A reference point is set on the release film 20, and a plurality of positions for measuring the thickness of the release film are set along the width direction. The distance between the measurement positions can be appropriately set, and the thickness of the release film is substantially difficult to change rapidly, so it is only necessary to set the distance between about 1 mm to 10 mm. Moreover, the reference point can be set as the side edge of a release film, for example. Measure the thickness of the release film at each measurement position and move the film appropriately in the longitudinal direction, and measure the thickness of the release film in the same manner at appropriate times. The average value is calculated by using multiple measured thickness values in the longitudinal direction measured at the same position in the width direction, and the difference between the maximum value and the minimum value of the average value of the release film thickness calculated for each measurement position in the width direction becomes the thickness fluctuation range. .

As a method of measuring the thickness, methods using a contact type thickness measuring device, an optical type thickness measuring device, an electrostatic capacitance type thickness measuring device, and a radiation type thickness measuring device using β rays or fluorescent X-rays, etc., and borrowing The method etc. which measure the cross section of the peeling film 20 by microscopic observation. If a contact type thickness measuring device is used, the thickness variation of the peeling film 20 can be directly measured. Moreover, the variation range of the thickness of the base film 22 and the peeling layer 24 can be measured respectively by the same method or different methods, and the thickness of each can be summed up as the thickness of the peeling film 20. For example, it is also possible to measure the thickness of the base film 22 with a radiation-type film thickness gauge, and measure the thickness of the peeling layer 24 by using an optical measurement obtained from a spectrophotometer. magnitude. In addition, in the optical thickness measuring device, the diameter of the measuring point may be appropriately set, and may be set to about 0.2 m to 2 mm.

In addition, a thickness measuring device may be installed in the line of a coating device, a cutting device, etc., and the thickness may be measured sequentially. By optically or radially measuring the thickness by installing the measuring device in the line, it is possible to prevent the measuring device from coming into contact with the peeling film 20 . Thereby, damage etc. can be suppressed, and the quality of a peeling film roll can fully be maintained. The thickness can be measured over the entire length of the peeling film 20 by installing a thickness measuring device in the coating line or the cutting line, and moving the thickness measuring device back and forth in the width direction when the peeling film 20 is conveyed.

The width of the release film before cutting may be, for example, 1 to 2 m. The release film roll before cutting is manufactured by winding a release film around a core. At this time, the peeling surface side of the peeling film can be wound up on a core as either the inner side or the outer side. The peeling film before cutting can also be cut along the longitudinal direction and wound on one or a plurality of cores 10 . Thereby, the peeling film 20 can be adjusted to an appropriate width. The cutting method of the release film may be appropriately selected. For example, cutting can be performed using a cutting device having an upper knife roll and a lower knife roll. The upper knife roller can be equipped with a plurality of upper knives at specific intervals along the direction of its rotation axis. The upper knife of the upper knife roll can engage with the lower knife roll.

The release film pulled out from the release film roll before cutting is conveyed between the upper knife roller and the lower knife roller of the cutting device. In the cutting device, the upper knife roll and the lower knife roll rotate in opposite directions to cut the release film. After cutting, the peeling film is wound up again on the core to become the peeling film roll 100 (after cutting) of one embodiment. The tension can be appropriately adjusted for winding to the core 10 , and the peeling surface side can be wound on the core 10 as either the inner side or the outer side. In order to suppress the winding deviation during transportation, the tension at the beginning of winding can also be increased and gradually weakened. It is also possible to promote the discharge of air between the release films 20 wound by the touch roll.

The outer diameter of the winding core 10 may be less than 170 mm, or less than 100 mm. Thereby, the size of the release film roll 100 can be reduced, and the installation space and transportation cost can be reduced.

The length of the release film 20 wound around the core 10 may be 4000 m or more, may be 5000 m or more, and may be 6000 m or more. Thereby, the replacement frequency of the release film roll 100 can be reduced, and the production efficiency of various products such as ceramic green sheets and ceramic parts can be fully improved.

In the peeling film roll 100, since the surface roughness (Rp) of the winding core 10 is sufficiently small, deformation|transformation of the peeling film 20 can be suppressed even in the vicinity of the winding core 10. Therefore, the take-up force of the release film 20 can be increased when the release film roll 100 is produced. Thereby, it can fully suppress that the peeling film roll 100 collapses during transportation, or a winding misalignment occurs.

Fig. 3 is a cross-sectional view of a ceramic component sheet according to an embodiment of the present invention. The manufacturing method of the ceramic component sheet 40 of FIG. 3 has the following steps, that is, on the surface 24a of the release layer 24 of the release film 20 pulled out from the release film roll, a paste containing ceramic powder and an electrode paste are used to form a paste containing ceramic powder. Green sheet 30 of green sheet 32 and electrode green sheet 34 .

The ceramic green sheet 32 can be formed by applying a ceramic slurry containing ceramic powder and drying it. The electrode green sheet 34 can be formed by coating an electrode slurry on the ceramic green sheet 32 and drying it.

For example, in the case of a multilayer ceramic capacitor, a ceramic slurry can be prepared by kneading a dielectric raw material (ceramic powder) and an organic vehicle. Examples of dielectric raw materials include various compounds that become composite oxides or oxides by firing. For example, carbonates, nitrates, hydroxides, organometallic compounds and the like can be appropriately selected and used. The dielectric material is a powder with an average particle size of 4 μm or less, preferably 0.1-3.0 μm.

For example, the electrode paste can be at least one selected from the group consisting of conductive materials such as various conductive metals and alloys, and materials that become conductive materials after being calcined with various oxides, organic metal compounds, and resin hydrochloric acid. Those prepared by mixing with an organic medium. As the conductor material used when producing the electrode paste, it is preferable to use Ni metal, Ni alloy, or a mixture thereof. In order to improve adhesion, the electrode paste may also contain a plasticizer. Examples of the plasticizer include phthalates such as butyl benzyl phthalate (BBP), adipic acid, phosphoric acid esters, glycols, and the like.

The organic vehicle included in the ceramic slurry and the electrode slurry is prepared by dissolving a binder resin in an organic solvent. Binder resins used in organic vehicles include, for example, ethyl cellulose, acrylic resins, butyral resins, polyvinyl acetal, polyvinyl alcohol, polyolefins, polyurethanes, polystyrene Ethylene, and their copolymers, etc. Among them, a butyral-based resin is preferable, and specifically, a polyvinyl butyral-based resin is used. The mechanical strength of the ceramic green sheet can be improved by using the butyral resin. One or both of ceramic slurry and electrode slurry may also contain at least one additive selected from the group consisting of various dispersants, plasticizers, static removers, dielectrics, glass frits, insulators, etc. .

The above-mentioned ceramic slurry is applied to the surface 24a of the release layer 24 of the release film 20, for example, using a doctor blade device or the like. Then, the coated ceramic slurry is dried in a drying device, for example, at a temperature of 50-100° C. for 1-20 minutes to form a ceramic green sheet 32 . The ceramic green sheet 32 shrinks by 5 to 25% compared with before drying.

Thereafter, the above-mentioned electrode paste is printed on the surface 32a of the ceramic green sheet 32 so as to form a specific pattern, for example, using a screen printing device. The printed electrode paste is dried in a drying device, for example, at a temperature of 50-100° C. for 1-20 minutes to form an electrode green sheet 34 . In this way, the ceramic component sheet 40 in which the ceramic green sheet 32 and the electrode green sheet 34 are sequentially laminated on the release layer 24 of the release film 20 can be obtained.

If the thickness variation range of the release film 20 of the release film roll 100 becomes larger, the thickness variation of the ceramic green sheet 32 becomes larger. The release film 20 pulled out from the release film roll 100 is less deformed near the core 10, and the range of thickness variation of the release film 20 is also small, so the range of thickness variation of the release film 20 near the core 10 can be sufficiently reduced. The ceramic green sheet 32.

Since the thickness variation of the peeling film 20 near the winding core 10 is also suppressed, it is also possible to form a ceramic green sheet 32 and an electrode green sheet 34 up to a part within 300 m from the rear end of the peeling film 20 on the winding core 10 side, for example. Blank 30. The green sheet 30 may also be formed up to a part within 250 m from the rear end, or a part within 200 m. In this way, the release sheet 12 up to the vicinity of the core 10 can be effectively used, so the manufacturing cost can be reduced, and the replacement frequency of the release film roll 100 can be reduced to improve the production efficiency of the green sheet 30 .

In the ceramic component sheet 40, the thickness variation range of the green sheet 30 including the ceramic green sheet 32 and the electrode green sheet 34 is sufficiently reduced. Ceramic parts manufactured using such a ceramic part sheet 40 are excellent in reliability. In addition, such a ceramic component sheet 40 and ceramic components can be manufactured at relatively low manufacturing costs.

The thicknesses of the ceramic green sheet 32 and the electrode green sheet 34 may be 1.0 μm or less. In this way, thickness variation can be suppressed even if the thickness is small, so ceramic parts with high reliability can be obtained. The ceramic component sheet of the present invention is not limited to the one shown in FIG. 3 , for example, it may not have an electrode green sheet and only include a ceramic green sheet 32 .

A method for manufacturing ceramic parts according to an embodiment of the present invention includes: a layering step of preparing a plurality of ceramic part sheets, and laminating green sheets of the plurality of ceramic part sheets to obtain a laminate; The body is calcined to obtain a sintered body; and the electrode forming step is to form a terminal electrode on the sintered body to obtain a laminated ceramic capacitor.

Fig. 4 is a cross-sectional view showing an example of a multilayer ceramic capacitor manufactured by the above-mentioned manufacturing method. The multilayer ceramic capacitor 90 includes an inner layer portion 92 and an outer layer portion 93 sandwiching the inner layer portion 92 in the stacking direction. Multilayer ceramic capacitor 90 has terminal electrodes 95 on side surfaces.

The inner layer portion 92 has a plurality of layers (thirteen layers in this example) of ceramic layers 96 and a plurality of layers (twelve layers in this example) of internal electrode layers 94 . Ceramic layers 96 and internal electrode layers 94 are laminated alternately. The internal electrode layer 94 is electrically connected to the terminal electrode 95 . The outer layer portion 93 is formed of a ceramic layer. The ceramic layer can be formed, for example, in the same manner as the ceramic green sheet 32 .

As an example of the lamination process, the green sheet 30 is obtained by peeling off the release film 20 of the ceramic component sheet 40 shown in FIG. 3 . One side 30b of the green sheet 30 is laminated on the outer layer green sheet. Another green sheet 30 is obtained by peeling the other release film 20 from another ceramic component sheet 40, and the electrode green sheet 34 of the first peeled green sheet and 30b of the other green sheet 30 are laminated so as to face each other. Thereafter, the green sheets 30 are laminated by repeating this procedure, thereby obtaining a laminated body. That is, in this lamination step, the green sheet 30 is obtained by peeling the release film 20, and the green sheet 30 is sequentially laminated. A laminate is formed by repeating this sequence a plurality of times. Finally, lamination of green sheets for the outer layer can also be carried out.

The number of laminated sheets of green sheets in the laminated body is not particularly limited, for example, it may be tens to hundreds of layers. On both ends of the laminated body perpendicular to the lamination direction, a relatively thick green sheet for the outer layer not formed with an electrode layer can also be provided. After the laminate is formed, the laminate may be cut to produce green chips.

In the calcining step, the laminate (green sheet) obtained in the lamination step is calcined to obtain a sintered body. Calcination conditions can be carried out at 1100-1300°C in a gas atmosphere such as a humidified nitrogen-hydrogen gas mixture. However, the oxygen partial pressure in the gas atmosphere during firing is preferably 10 ^-2 Pa or less, more preferably 10 ^-2 to 10 ^-8 Pa. Furthermore, before firing, it is preferable to perform binder removal treatment of the laminate. Binder removal treatment can be carried out under normal conditions. For example, when using a base metal such as Ni or a Ni alloy as the conductor material of the internal electrode layer, it is preferable to carry out at 200 to 600°C.

After sintering, heat treatment may also be performed in order to re-oxidize the dielectric layer constituting the sintered body. The holding temperature or maximum temperature in the heat treatment is preferably 1000-1100°C. The oxygen partial pressure during heat treatment is preferably higher than that in the reducing gas atmosphere during calcination, more preferably 10 ^-2 Pa to 1 Pa. Preferably, the sintered body obtained in this way is subjected to, for example, barrel grinding, end surface grinding by sandblasting, or the like.

In the electrode forming step, the terminal electrode 95 is formed by firing the terminal electrode paste on the side surface of the sintered body, thereby obtaining the multilayer ceramic capacitor 90 shown in FIG. 4 . In this method of manufacturing the multilayer ceramic capacitor 90 , the multilayer ceramic capacitor 90 can be manufactured using the green sheet 30 formed on the release film 20 near the winding core 10 of the release film roll 100 . In the release film roll 100, the thickness fluctuation range of the release film 20 near the core 10 is sufficiently reduced, so the thickness fluctuation range of the green sheet 30 is also sufficiently reduced. Therefore, the green sheet 30 of the release film 20 formed near the winding core 10 can also be used in the manufacture of the multilayer ceramic capacitor 90 .

This type of multilayer ceramic capacitor 90 suppresses a drop in withstand voltage and is excellent in reliability. Therefore, according to the above-described manufacturing method, multilayer ceramic capacitor 90 having excellent reliability can be manufactured with high yield. In addition, since the previously unused release film 20 can also be used, the manufacturing cost can be reduced.

Some embodiments have been described above, but the present invention is by no means limited to the above-mentioned embodiments. For example, an example of forming a laminated ceramic capacitor as a ceramic component has been described, but the ceramic component of the present invention is not limited to the laminated ceramic capacitor, and may be other ceramic components, for example. The ceramic component may be, for example, a varistor or a multilayer inductor. Example

The content of the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.

(Example 1) To prepare a release film, a release agent solution was prepared in the following procedure. With respect to 100 parts by mass of nonanediol diacrylate, 0.415 parts by mass of acrylate-modified silicone oil (trade name: X-22-2445, manufactured by Shin-Etsu Chemical Co., Ltd.), 100 parts by mass of methyl ethyl ketone, And 100 parts by mass of toluene. These were put into a metal container and mixed with stirring to obtain a colorless and transparent solution.

To the above solution, 2.5 parts by mass of a reaction initiator (trade name: Omnirad 127, manufactured by IGM Rasins B.V.) was added to prepare a coating liquid. The coating solution is extruded from the slit of the coating device and coated on a biaxially stretched polyethylene terephthalate film (PET film, thickness: 31 μm, thickness variation in the width direction: 0.46 μm) with a width of 1100 mm ) on one side, blow hot air at 80°C for 30 seconds to evaporate methyl ethyl ketone and toluene. In this way, a coating layer was formed on the PET film.

Next, irradiate ultraviolet rays under a nitrogen atmosphere with an oxygen concentration of 100 ppm to harden the coating layer and form a peeling layer with a peeling function. In this way, a release film having a release layer on one side of the PET film was obtained.

The thickness of the release film was measured in the following order. An optical thickness measuring device is installed between the ultraviolet curing part of the coating device and the coiler of the release film to measure the thickness of the release film. The thickness measuring device includes a detection part for thickness measurement for measuring peeled layers having different wavelength ranges, and a detection part for thickness measurement of PET film. In addition, the diameter of the measurement point was set to 1 mm, and the measurement positions were set at intervals of 4 mm based on a single side end of the release film. While moving these detecting parts in the width direction, the thicknesses of the release layer and the PET film were measured at intervals of 4 mm in the width direction. The thickness of the peeling film was obtained by adding the measured values of the peeling layer and the PET film obtained by the optical thickness measuring device. Moreover, the thickness measurement was continued while conveying the peeling film and moving the thickness measuring device back and forth. Thereby, the thickness of the peeling film was measured over the entire length of the peeling film. The average value of the thickness of the release layer was 0.5 μm.

The surface roughness (Rp) of the release layer of the release film was measured using a scanning white interference microscope (device name: VS1540, manufactured by Hitachi High-Tech Science Co., Ltd.). As a result, the surface roughness (Rp) of the release layer was 30 nm. In addition, the total length of the manufactured peeling film was 8500 m.

Use a cutting machine to cut the release film along the length, and cut it to a size of 200 mm in width. This release film is wound up on a core so that the release surface becomes the outside. Winding is carried out in such a way that the tension applied to the rolled-up release film gradually becomes weaker from the beginning of winding to the end of winding. In this way, five release film rolls having a winding length of 4000 m of the release film were obtained. In addition, the part of the peeling film before cutting was cut|disconnected and discarded from both ends toward the inner side of 50 mm.

For each cut release film roll, calculate the thickness data of the release film measured in the above procedure corresponding to the position of each release film, and calculate the thickness variation in the width direction for each release film roll.

Fiber-reinforced plastic cores for winding are made by impregnating glass fibers with epoxy resin, pressurized and laminated. The core has an inner diameter of 76.2 mm and an outer diameter of 88.2 mm. Use abrasive paper to grind the outer peripheral surface of the core. Grinding is carried out by changing the abrasive paper from rough eye paper to fine eye paper step by step. Surface treatment is carried out in this way to adjust the surface roughness of the outer peripheral surface of the core.

After surface treatment, the surface roughness Rp and Rv of the outer peripheral surface of the core were 1.5 μm and 3.0 μm, respectively. The surface roughness (Rp and Rv) was measured using a surface roughness measuring machine (trade name: SJ-210) manufactured by Mitutoyo Co., Ltd. in the following procedure. The outer peripheral surface of the core with a width of 202 mm was divided into 14 pieces along the direction corresponding to the width direction of the release film, and the surface roughness of each piece was measured. This measurement is repeated every 1/4 turn of the core, and the surface roughness is measured on 56 pieces in total. Among Rp and Rv of each of the 56 pieces, the respective maximum values were taken as the surface roughness Rp and Rv of the outer peripheral surface of the winding core. The results are shown in Table 1.

From the release film rolls obtained by cutting the release film, one release film roll with a thickness variation range of 0.5 μm in the width direction was selected. The release film was pulled out from the release film roll, and a dielectric sheet was produced as a ceramic component sheet in the following procedure. BaTiO ₃ -based powder as a ceramic powder, polyvinyl butyral (PVB) as an organic binder, and methanol as a solvent were prepared separately. Next, 10 parts by mass of an organic binder and 165 parts by mass of a solvent were prepared with respect to 100 parts by mass of the ceramic powder, and kneaded by a ball mill to obtain a dielectric slurry.

Put the release film roll on the coating machine, apply the dielectric slurry on the release layer side of the release film pulled out from the release film roll, and form a dielectric green sheet on the release film. The thickness of the dielectric green sheet was set to 0.9 μm. The thickness is continuously measured using a penetrating X-ray film thickness gauge (trade name: AccureX, manufactured by FUTEC Co., Ltd.) installed on the production line. The coating of the dielectric paste was completed with 100 m of the release film wound around the core remaining. Thereafter, the peeling film was pulled out from the core in an uncoated state to run in the coating machine, and the running was stopped with 70 m of the peeling film remaining on the core. Based on the data measured by the transmission type X-ray film thickness gauge, the average value of the thickness of the dielectric green sheet and the variation range of the thickness (thickness variation range) were investigated. In addition, the range of thickness variation was calculated|required from the average value, maximum value, and minimum value of thickness. That is, the greater value of the absolute value of the maximum value-average value and the absolute value of the minimum value-average value is used as the thickness fluctuation range.

The thickness variation range of the dielectric green sheet from the front end side of the release film where the dielectric slurry was applied to the remaining 500 m was 0.03 μm. On the other hand, the thickness variation range of the dielectric green sheet was 0.04 μm in the portion from the remaining 500 m to the remaining 100 m (portion on the end side after the release film). Table 1 summarizes various conditions and results.

(Example 2-3) A release film roll was produced in the same manner as in Example 1, except that the grinding conditions of the outer peripheral surface of the core were adjusted and the surface roughness of the outer peripheral surface of the core was changed. Then, a dielectric green sheet was formed on the release film pulled out from the release film roll in the same manner as in Example 1, and the thickness variation range was investigated. The results are shown in Table 1.

(Example 4, 5) Molten polyethylene terephthalate is cast from a nozzle provided with a slit to a cooling drum to produce a PET film. At this time, by adjusting the gap of this slit more precisely, the PET film which differed in the width|variety of the thickness variation of the width direction from Example 1 was obtained. Except having used this PET film, the peeling film was produced in the same manner as in Example 1, and the peeling film roll which the width|variety of the thickness variation of the width direction was smaller than Example 1 was obtained. Then, in the same manner as in Example 1, a dielectric green sheet was formed on the release film pulled out from the release film roll, and the thickness variation range of the dielectric green sheet was investigated. The results are shown in Table 1.

(Example 6) A PET film was produced in the same manner as in Examples 1, 4, and 5. At this time, the PET film was produced without adjusting the slit gap more precisely than in Examples 1, 4, and 5. Thereby, the PET film which differed from Example 1, 4, and 5 in the range of thickness variation of the width direction was obtained. Except having used this PET film, the peeling film was produced in the same manner as in Example 1, and the peeling film roll with the thickness variation range of the width direction larger than Example 1 was obtained. In the same manner as in Example 1, a dielectric green sheet was formed on a release film pulled out from a release film roll, and the thickness variation range of the dielectric green sheet was investigated. The results are shown in Table 1.

(Example 7) A release film roll was obtained in the same manner as in Example 1 except that a core made of ABS (acrylonitrile-butadiene-styrene copolymer resin) was used instead of a core made of fiber-reinforced plastic. This ABS core is produced by extrusion molding. Since the outer peripheral surface is not ground, the surface roughness of the outer peripheral surface of the core depends on the surface shape of the mold. A dielectric green sheet was formed on a release film pulled out from a release film roll in the same manner as in Example 1, and the thickness variation range was investigated. The results are shown in Table 1.

(Embodiment 8) A release film was produced in the same manner as in Example 1 except for using the same core as in Example 2, using the same release film as in Example 4, and setting the winding length to 8000 m. The range of thickness variation was investigated in the same manner as in Example 1, except that the dielectric green sheet was formed longer than in Example 1 according to the length of the wound release film. The results are shown in Table 1.

(Example 9) A release film was produced in the same manner as in Example 1 except for using the same winding core as in Example 3, using the same release film as in Example 4, and setting the winding length to 6000 m. The range of thickness variation was investigated in the same manner as in Example 1, except that the dielectric green sheet was formed longer than in Example 1 according to the length of the wound release film. The results are shown in Table 1.

(Example 10) A release film was produced in the same manner as in Example 1 except for using the same winding core as in Example 3, using the same release film as in Example 5, and setting the winding length to 8000 m. The range of thickness variation was investigated in the same manner as in Example 1, except that the dielectric green sheet was formed longer than in Example 1 according to the length of the wound release film. The results are shown in Table 1.

(Example 11) After the dielectric green sheet was formed on the release film pulled out from the release film roll in Example 1, the core was reused to produce the release film roll of Example 1 again. A dielectric green sheet is again formed on the release film pulled out from the release film roll. In this way, the production of the release film roll and the production of the dielectric green sheet on the release film pulled out from the release film roll were repeated 30 times in total. Investigate the variation range of the thickness of the dielectric green sheet produced for the 30th time. The results are shown in Table 1.

(Example 12) A release film roll was produced in the same manner as in Example 1, except that the release film was wound up with the release surface on the inside during winding to the core. Then, a dielectric green sheet was formed on the release film pulled out from the release film roll in the same manner as in Example 1, and the thickness variation range was investigated. The results are shown in Table 1.

(comparative example 1) A peeling film roll was produced in the same manner as in Example 1, except that the outer peripheral surface of the core was ground only with coarse abrasive paper to change the surface roughness of the outer peripheral surface of the core. Then, a dielectric green sheet was formed on the release film pulled out from the release film roll in the same manner as in Example 1, and the thickness variation range was investigated. The results are shown in Table 1.

(comparative example 2) A release film roll was obtained in the same manner as in Comparative Example 1, except that PET films having different thickness variations were used and the length of the release film wound up on the core was changed as shown in Table 1. In the same manner as Comparative Example 1, a dielectric green sheet was formed longer than Comparative Example 1 depending on the winding length on the release film pulled out from the release film roll, and the thickness variation range was investigated. The results are shown in Table 1. The film thickness variation of the dielectric green sheet begins to increase from around 500 m, and the film thickness changes particularly greatly from 300 m.

(comparative example 3) Instead of FRP cores, Bakelite cores with the surface roughness of the outer peripheral surface shown in Table 1 were used. A release film roll was obtained in the same manner as in Example 1 except for using the core. A dielectric green sheet was formed on a release film pulled out from a release film roll in the same manner as in Example 1, and the thickness variation range was investigated. The results are shown in Table 1. The film thickness variation of the dielectric green sheet begins to increase from around 500 m, and the film thickness changes particularly greatly from 300 m.

[Table 1] Core material Core Surface Roughness (μm) Variation range of peeling film thickness Winding length of peel film roll Dielectric Green Sheet Thickness Variation Range (μm) Rp Rv (μm) (m) ~500m 500m~100m Example 1 FRP 1.5 3.3 0.5 4000 0.03 0.04 Example 2 FRP 1.0 3.3 0.5 4000 0.03 0.04 Example 3 FRP 0.4 1.1 0.5 4000 0.03 0.03 Example 4 FRP 1.5 3.3 0.4 4000 0.02 0.04 Example 5 FRP 1.5 3.3 0.3 4000 0.02 0.03 Example 6 FRP 1.5 3.3 0.6 4000 0.04 0.05 Example 7 ABS 1.5 3.3 0.5 4000 0.03 0.04 Example 8 FRP 1.0 3.3 0.4 8000 0.02 0.04 Example 9 FRP 0.4 1.1 0.4 6000 0.02 0.03 Example 10 FRP 0.4 1.1 0.3 8000 0.02 0.03 Example 11 FRP 1.5 3.3 0.5 4000 0.03 0.04 Example 12 FRP 1.5 3.3 0.5 4000 0.03 0.04 Comparative example 1 FRP 2.0 5.0 0.5 4000 0.03 0.06 Comparative example 2 FRP 2.0 5.0 0.6 6000 0.04 0.07 Comparative example 3 bakelite 4.0 8.7 0.5 4000 0.03 0.07

In Comparative Examples 1 to 3, the variation range of the thickness of the dielectric green sheet becomes larger on the core side, that is, on the rear end side (500 m to 100 m) of the release film. In a multilayer ceramic capacitor obtained by laminating and firing such dielectric green sheets, there is a possibility of poor withstand voltage. On the other hand, in Examples 1 to 12, the variation range of the thickness of the dielectric green sheet can also be reduced on the winding core side, that is, the rear end side (500 m to 100 m) of the release film. The capacitor obtained by laminating and firing such dielectric green sheets has high withstand voltage and excellent reliability. Also, from the results of Example 11, it was confirmed that the core made of fiber-reinforced plastic can be used repeatedly, and it is also excellent in durability. On the other hand, although the thickness variation of the ABS core of Example 7 is small, the core is deformed after use, making it difficult to reuse. [Industrial availability]

According to this invention, the peeling film roll which can utilize a peeling film effectively up to the core vicinity can be provided. Moreover, this invention can provide the manufacturing method which can manufacture a ceramic part sheet|seat and a ceramic part with high production efficiency by using such a release film roll. Also, the present invention can provide a ceramic component sheet and a ceramic component excellent in reliability.

10: Core 20: Peel off film 22: Substrate film 24: peeling layer 24a: The surface of the release layer 30: Blank 30b: one side of the blank 32: ceramic green sheet 32a: The surface of the ceramic green sheet 34: electrode blank 40: ceramic parts sheet 90:Laminated Ceramic Capacitors 92: inner part 93: outer part 94: Internal electrode layer 95: terminal electrode 96: ceramic layer 100: peel film roll

Fig. 1 is a perspective view of a release film roll according to an embodiment. Fig. 2 is a sectional view showing an example of a section of a release film. Fig. 3 is a cross-sectional view of a ceramic component sheet according to an embodiment. Fig. 4 is a sectional view showing a ceramic component according to an embodiment.

10: Core

20: Peel off film

100: peel film roll

Claims (8)

A release film roll comprising a release film having a base film and a release layer, and a core on which the release film is wound, wherein the outer peripheral surface of the core has a surface roughness (Rp) of 1.5 μm or less, and The thickness fluctuation range of the said peeling film in the width direction is 0.5 micrometers or less. The release film roll as claimed in claim 1, wherein the above-mentioned roll core is made of fiber-reinforced plastic. The release film roll according to claim 1 or 2, wherein the outer diameter of the above-mentioned core is 170 mm or less, and the length of the above-mentioned release film wound on the above-mentioned core is 4000 m or more. A method for manufacturing a ceramic component sheet, comprising the steps of: using a slurry containing ceramic powder on the above-mentioned release layer of the above-mentioned release film drawn from the release film roll according to any one of claims 1 to 3 A ceramic green sheet is formed on the surface. The method of manufacturing a ceramic component sheet according to claim 4, wherein the ceramic green sheet is formed in a portion within 300 m from the rear end of the release film drawn from the release film roll. A method for manufacturing a ceramic part, comprising the steps of: using the above-mentioned ceramic part sheet obtained by the manufacturing method according to claim 4 or 5 to obtain a laminate including the above-mentioned ceramic green sheet; and calcining the above-mentioned laminate to obtain sintered body; and This ceramic component includes the above-mentioned sintered body. A ceramic component sheet obtained by forming a green sheet comprising a ceramic green sheet on the surface of the release layer of the release film drawn from the release film roll according to any one of claims 1 to 3. A ceramic part, which has a sintered body, the sintering system forms a laminated body of ceramic green sheets including the ceramic part sheet according to claim 7, and is obtained by calcining the laminated body.

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