TW202200376A - Release film roll, ceramic component sheet and method for producing same, and ceramic component and method for producing same - Google Patents

Abstract

The present invention provides a release film roll that is provided with a release film which has a base material film and a release layer, and a roll core around which the release film is wound, wherein the surface roughness (Rp) of the outer circumferential surface of the roll core is 1.5 [mu]m or less. The present invention also provides a method for producing a ceramic component sheet, said method comprising a step wherein a ceramic green sheet is formed using a paste which contains a ceramic powder on the surface of a release layer of a release film that is delivered from a release film roll.

Description

Release film roll, ceramic part sheet and method for producing the same, and ceramic part and method for producing the same

The present invention relates to a release film roll, a ceramic part sheet and a method for producing the same, and a ceramic part and a method for producing the same.

In recent years, as electronic equipment is increasingly required to be miniaturized, electronic components are also becoming more and more miniaturized. Ceramic parts, which are one of electronic parts, are also getting smaller and smaller year by year. For example, in a multilayer ceramic capacitor, which is a type of ceramic parts, the thickness of the dielectric layer and the internal electrode is reduced to increase the capacitance. A general multilayer ceramic capacitor is produced by using a release film as a carrier film, forming a dielectric layer and an internal electrode on the carrier film to form a green sheet, and peeling off the green sheet and laminating the green sheet.

When the thickness of the dielectric layer of the multilayer ceramic capacitor becomes thinner, there is a tendency that the durability and the withstand voltage performance under the voltage strength, which represents a short-circuit or the like, will decrease. In particular, when the thickness of the dielectric layer is not uniform, the thinner portion becomes a factor that reduces the withstand voltage performance. The withstand voltage of the multilayer ceramic capacitor having the dielectric layer having such a thin portion is poor, so that 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 of the multilayer ceramic capacitor is improved.

If there are wrinkles and creases in the release film used as the carrier film for the dielectric layer, the thickness will fluctuate. In addition, the smoothness of the surface of the release film affects the uniformity of the thickness of the dielectric layer. In view of such a situation, for example, in Patent Document 1, a release film roll that can smooth the release film and reduce the thickness unevenness of the dielectric layer is studied. prior art literature Patent Literature

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

[Problems to be Solved by Invention]

In the manufacturing step of the ceramic part, a ceramic green sheet is formed on the release film drawn from the release film roll. 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 into the release film roll and reduce the frequency of replacement of the release film roll. However, if the winding length of the peeling film is increased, the size of the peeling film roll will be increased, and the inner part of the peeling film roll, that is, the pressure applied to the peeling film in the vicinity of the core will increase.

Therefore, when a protrusion (convex portion) is present on the core, the protrusion shape of the core is transferred to the release film in the vicinity of the core. In the case of a thin ceramic green sheet, the transferred protrusion shape becomes a factor of thickness variation of the ceramic green sheet. Although the thickness variation improves as it moves away from the core, the thickness of the ceramic green sheet fluctuates greatly due to the large deformation of the release film near the core. In order to suppress the thickness variation of the ceramic green sheet, do not use and abandonment and other countermeasures. If the peeling film that has not been effectively utilized can be utilized, the peeling film can be effectively utilized, and the frequency of replacing the peeling film roll can be reduced, so that the production efficiency of various products such as ceramic green sheets and ceramic parts can be expected to be improved.

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

A release film roll according to one aspect of the present invention includes 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 in 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 is increased and the pressure applied to the inner release film is increased, it is possible to suppress the pressure near the core. The release film is deformed and the thickness variation of the release film is reduced. Therefore, even if the winding length of the release film is lengthened, the release film can be effectively utilized up to the vicinity of the core.

In addition, the surface roughness (Rp) shows the height of the highest protrusion (protrusion) in the roughness curve obtained by measuring the outer peripheral surface of a winding core. If there is even one large protrusion on the outer peripheral surface of the core, the shape is transferred to the release film by the protrusion, so that the deformation of the release film near the core is remarkable, and the thickness of the ceramic green sheet changes greatly. On the other hand, it is more difficult to transfer the shape to the release film by the depressions on the outer peripheral surface of the core than by the protrusions. Therefore, as the surface roughness of the above-mentioned core, by specifying Rp (maximum protrusion height) instead of Ra (arithmetic mean roughness) and Rv (maximum depression depth) to be below specific values, peeling near the core can be reduced Deformation of the membrane.

The thickness fluctuation range of the width direction of the release film wound around the core may be 0.5 μm or less. When 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 is reduced, and the deformation of the release film can be further suppressed. Especially in the case of peeling film rolls with large roll diameters, the effect of suppressing deformation is greater.

The core may contain fiber reinforced plastic. Thereby, the smoothness of the surface of the core can be improved, and the mechanical strength of the core can be improved. Therefore, the generation of wrinkles, creases, etc. in the release film due to deformation of the core can be sufficiently suppressed. Furthermore, there are cases where fiber reinforced plastics are called FRP (Fiber Reinforced Plastics, fiber reinforced plastics) or FWD (Fiber Winding Plastics, filament wound plastics).

The outer diameter of the core can be 170 mm or less. As the release film roll is wound, the shape transfer from the core occurs periodically at intervals of the circumferential length corresponding to the circumferential length corresponding to the diameter of the wound release film. This interval becomes narrower as the outer diameter of the core becomes smaller. The transfer of the protruding 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 that produces the transfer of the protruding shape becomes shorter when the core is small. Therefore, the length of the release film which has to be discarded with transfer can be shortened. In addition, 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 release film becomes longer, the pressure applied to the release film in the vicinity of the core increases, and it is easily influenced by the protrusions on the outer peripheral surface of the core. Since the height of the protrusions on the outer peripheral surface of the peeling film roll is sufficiently small, even if the length of the peeling film is lengthened, the deformation of the peeling film can be suppressed. Therefore, the replacement frequency of the peeling 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 for producing a ceramic component sheet according to one aspect of the present invention includes a step of forming a ceramic green sheet on the surface of the release layer of the release film drawn from any of the above-mentioned release film rolls using a slurry containing ceramic powder.

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

In the step of forming the above-mentioned ceramic green sheet, the ceramic green sheet may also be formed in a portion within 300 m from the rear end of the release film drawn from the release film roll. Even if the release film in the vicinity of the core is used in this manner, a ceramic green sheet whose thickness variation is suppressed can be produced. Thereby, the manufacturing cost of the ceramic green sheet can be sufficiently reduced. In the present invention, the "rear end" of the release film refers to an end mounted on the side of the core, and the "front end" of the release film refers to an end on the side of the outer peripheral surface of the release film roll.

A method for producing a ceramic part according to one aspect of the present invention includes the steps of obtaining a laminate including a ceramic green sheet using the ceramic part sheet obtained by the above-mentioned production method; and calcining the laminate to obtain a sintered body. In this manufacturing method, the release film in the vicinity of the core can also be utilized to manufacture ceramic parts. Therefore, the production efficiency of ceramic parts can be improved.

The ceramic part sheet of one aspect of the present invention can be obtained by forming a green sheet including a ceramic green sheet on the surface of the release layer of the 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 thickness variation of the release film is suppressed, the thickness variation of the green sheet of the ceramic component sheet is suppressed, and the reliability is excellent. Moreover, since the release film near the core can be used for production, the yield can be improved.

A ceramic component according to one aspect of the present invention includes a sintered body, and the sintered system forms a layered body of ceramic green sheets including the above-mentioned ceramic component sheet, and the layered body is obtained by calcining the layered body. Since the thickness variation of the ceramic green sheet is suppressed, the reliability of the ceramic component is excellent. In addition, since a ceramic green sheet produced using a release film near the core can be used, the yield can be improved. [Effect of invention]

ADVANTAGE OF THE INVENTION According to this invention, even if the winding length of a release film is lengthened, the release film roll which can effectively utilize a release film up to the vicinity of a core can be provided. Moreover, this invention can provide the manufacturing method which can manufacture a ceramic component sheet|seat and a ceramic component with high productivity by using such a peeling film roll. Furthermore, the present invention can provide a ceramic component sheet and 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 or equivalent elements are marked with the same symbols, and repeated descriptions are omitted as appropriate. However, the following embodiments are examples for explaining the present invention, and are not intended to limit the present invention to the following contents.

FIG. 1 is a perspective view of a release film roll according to one embodiment. The release film roll 100 of FIG. 1 is provided with the release film 20 which has a base material film and a release layer, and the core 10 with which the release film 20 was wound. The release film 20 is used as a carrier film in, for example, a manufacturing step of a ceramic part represented by a multilayer ceramic capacitor. In this production step, a ceramic green sheet to be a dielectric sheet and an electrode green sheet to be an internal electrode are formed, for example, on a release film by coating or printing, and thereafter, these are peeled off and laminated, and the The laminated body is fired to produce ceramic parts. The release film 20 is used by being pulled out from the release film roll 100 .

As a material of the core 10, paper, plastic, metal, etc. are mentioned. Particles can cause pinholes in the manufacture of ceramic parts, so it is preferable to include lightweight plastics that do not produce paper dust. As such a material, ABS resin, bakelite, fiber-reinforced plastic, etc. are mentioned. Among them, the ABS resin may be deformed after one use, 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, it is possible to reduce industrial waste and achieve effective utilization of resources. Moreover, when the winding length of the release film 20 is lengthened, the deformation|transformation of the winding core 10 can be suppressed fully. Among fiber-reinforced plastics and bakelites, fiber-reinforced plastics are particularly preferred because of their flexibility in addition to higher 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 core 10 is preferably 1.0 μm or less, more preferably 0.6 μm or less. If the surface roughness (Rp) is larger than 1.5 μm, the protrusions (protrusions) on the outer peripheral surface of the core 10 press against the release film 20 to transfer the shape of the protrusions, thereby deforming the release film 20 . 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 deforms 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 the multilayer ceramic capacitor manufactured using the release film 20, the thickness of the dielectric layer is uneven, and the withstand voltage is lowered where the thickness of the dielectric layer is small, and the electrostatic capacitance is lowered where the thickness is large. On the other hand, when the surface roughness (Rp) of the outer peripheral surface of the core 10 becomes small, the protrusion becomes 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 winding core 10 are the "maximum protrusion height" and "maximum recess height" stipulated by JIS (Japanese Industrial Standards) B 0601-2001. These surface roughnesses can be measured using a contact surface roughness meter.

The surface roughness (Rp) of the outer peripheral surface of the 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, fibers impregnated with resin are wound around a mandrel, and then, if necessary, a resin sheet is wound. Instead of wrapping the resin sheet, the resin may be coated. Next, after heating to harden the resin with heat or the like, the mandrel is removed to obtain a bare tube serving as a winding core.

As resin, epoxy resin, unsaturated polyester resin, etc. are mentioned. As fiber, glass fiber, aramid fiber, etc. are mentioned. In consideration of cost and the like, the resin is preferably an unsaturated polyester resin. From the same viewpoint, the fiber is preferably a glass fiber.

Next, the outer peripheral surface of the bare tube is smoothed by cutting with a lathe or the like. For example, the surface roughness (Rp) of the outer peripheral surface can be reduced by slowing down the feed speed of the turning tool. Moreover, the surface roughness (Rp) of an outer peripheral surface can be made small enough by performing grinding|polishing (for example, fine grinding|polishing) using a grinding paper or a polishing liquid containing an abrasive material. Grinding can be carried out using coarse-grained abrasive paper or coarse-grained abrasive, or by gradually changing from coarse-grained abrasive paper or abrasive to fine-grained abrasive paper or abrasive material. By performing such grinding, the surface roughness (Rp) of the outer peripheral surface can be reduced.

Cut the surface-treated bare tube to a specific length. If necessary, the burrs on the cut surface can be removed. In addition, pinholes can be suppressed from being generated in the ceramic green sheet by removing chips (foreign matters) generated during cutting, grinding, and cutting.

FIG. 2 is a cross-sectional view showing an example of a cross-section of the 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 resins are preferred. Among the polyester resins, polyethylene terephthalate (PET) is more preferable from the viewpoints of mechanical properties, transparency, cost, and the like.

The thickness of the base film 22 is preferably 10 to 100 μm, more preferably 20 to 50 μm. When the thickness is less than 10 μm, the physical properties such as the dimensional stability of the release film 20 tend to be impaired. When the thickness exceeds 100 μm, the production 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 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 a polyester film is used as the base film 22, it can be manufactured in the following procedure. First, the molten polyester is cast into a cooling drum using an extruder. Molten polyester is extruded from a slotted nozzle. After cooling, it was peeled off from the cooling drum to obtain an unstretched polyester film. As long as the gap between the slits of the extruder is adjusted, the thickness of the polyester film and its variation range can be adjusted.

Next, the unstretched polyester film is stretched to adjust to a desired thickness and impart mechanical strength. The stretching of the polyester film is preferably carried out by biaxial stretching. In this case, after longitudinal extension, lateral extension is performed. The stretching temperature at the time of stretching is preferably performed at a temperature equal to or higher than the glass transition temperature of the polyester film and equal to or lower than the melting temperature. The longitudinal extension and the transverse extension can be respectively extended several times or so. The thickness variation of the unstretched film will also continue after stretching. Therefore, the thickness fluctuation range of the base film 22 and the release film 20 can be adjusted by controlling the thickness fluctuation of the unstretched film.

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

As a release agent for forming the release layer 24, a silicone type release agent, a long-chain alkyl type release agent, a fluorine type release agent, and an amino alkyd resin type are mentioned, for example. Silicone-based 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 cured by heat treatment at 80 to 130° C. for several tens of seconds. In the case of an ultraviolet curing system, a mercury lamp, a metal halide lamp, or the like can be irradiated with ultraviolet rays as a light source and cured. In the case of radical polymerization by irradiation with ultraviolet rays, in order to prevent oxygen inhibition, it is preferable to perform curing in a nitrogen atmosphere. It is preferable that the variation in the thickness of the peeling layer 24 is small.

The addition reaction-based silicone release agent is formed by introducing a vinyl group to the terminal and/or side chain of polydimethylsiloxane, reacts with hydrosiloxane, and hardens it. Hardening can use platinum catalyst. For example, it can be hardened at a hardening temperature of about 100°C for several tens of seconds to several minutes. The thickness of the peeling layer 24 may be about 50-300 nm. Examples of the addition reaction system release agent include KS-847, KS-847T, KS-776L, KS-776A, KS-841, KS-774, KS-3703T, KS-3601 manufactured by Shin-Etsu Chemical Co., Ltd. (all are trade names).

The peeling layer 24 may contain, for example, a (meth)acrylate component and a cured product of a (meth)acrylate-modified silicone. Such a cured product can be cured by ultraviolet rays, so that the thickness of the peeling layer 24 can be increased. Therefore, for example, in the case where the base film 22 contains the filler, the protrusions caused by the filler can be covered to smooth the surface of the release layer 24 . In this case, the thickness of the peeling layer 24 may be 300-3000 nm.

It is also possible to use (meth)acrylate monomers and (meth)acrylate modified silicone oils that are incompatible with each other. These are mixed with a reaction initiator in a solvent, and after apply|coating to the base film 22, the solvent is dried. In this way, the peeling layer 24 can also be formed by curing by ultraviolet rays in a state in which the silicone-modified silicone oil is positioned near the surface. A known one 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 trade names) manufactured by Shin-Etsu Chemical Co., Ltd., etc. are mentioned.

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

The thickness fluctuation range in the width direction of the release film 20 is preferably 0.5 μm or less, more preferably 0.4 μm or less, and still more preferably 0.3 μm or less. Particularly 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 is reduced, so that the pressure difference in the vicinity of the core 10 can be sufficiently suppressed. The release film 20 is deformed.

In the present invention, when unwinding and winding the release film, the direction in which the release film is conveyed is referred to as the longitudinal direction, and the direction orthogonal to the longitudinal direction of the release film is referred to as the width direction of the release film. The width of the thickness variation in the width direction of the release film of the present invention is the difference between the maximum value and the minimum value of the thickness of the release film between both ends in the width direction of the release film 20 . 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 interval between the positions to be measured can be appropriately set, and the thickness of the peeling film is virtually difficult to change rapidly, so it is only necessary to set the interval between 1 mm and 10 mm. Moreover, a reference point can be set as the side edge of a peeling film, for example. The thickness of the release film was measured at each measurement position and the film was appropriately moved in the longitudinal direction, and the thickness of the release film was measured in the same manner. The average value is calculated by using a plurality of thickness measurement 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 in the average value of the thickness of the release film calculated for each measurement position in the width direction is the thickness fluctuation range. .

As a method for measuring thickness, methods using a contact thickness measuring device, an optical thickness measuring device, an electrostatic capacitance thickness measuring device, and a radiation thickness measuring device using beta rays, fluorescent X-rays, etc., and methods using The method of measuring the cross section of the release film 20 by microscope observation, etc. If a contact thickness measuring device is used, the thickness variation of the release film 20 can be directly measured. In addition, the thickness fluctuation range of the base film 22 and the peeling layer 24 may be measured by the same method or a different method, respectively, and the total thickness of the respective thicknesses may be used as the thickness of the peeling film 20 . For example, the thickness of the base film 22 may be measured with a radiation type film thickness meter, the thickness of the release layer 24 may be measured by an optical measurement obtained from a spectrophotometer, and the thickness variation of the release film 20 may be calculated by summing the respective thickness fluctuation ranges. magnitude. In addition, what is necessary is just to set the diameter of a measuring point suitably for an optical thickness measuring instrument, and it is good also as about 0.2 m - 2 mm.

Moreover, a thickness measuring device may be installed in the line of a coating apparatus, a cutting apparatus, etc., and thickness may be measured successively. By carrying out the thickness measurement in which the measuring device is installed in the line by an optical type or a radiation type, the contact between the measuring device and the release film 20 can be prevented. Thereby, damage etc. can be suppressed, and the quality of a peeling film roll can be fully maintained. The thickness can be measured over the entire length of the release film 20 by disposing the 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 release film 20 is conveyed for measurement.

The width of the peeling film before cutting may be, for example, 1 to 2 m. The release film roll before cutting is manufactured by winding the release film around the core. In this case, the release surface side of the release film may be wound around the core as either the inner side or the outer side. The release film before cutting can also be cut along the length direction and wound around 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 installed 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 be engaged with the lower knife roll.

The peeling film pulled out from the peeling film roll before cutting is conveyed between the upper knife roll and the lower knife roll of the cutting device. In the cutting device, the upper blade roll and the lower blade roll rotate in opposite directions to each other to cut the release film. After cutting, the release film is wound around the core again to be the release film roll 100 of one embodiment (after cutting). The winding to the core 10 can appropriately adjust the tension, and can be wound around the core 10 with the peeling surface side being either the inner side or the outer side. In order to suppress the winding deviation during transportation, the tension at the beginning of the 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 core 10 may be 170 mm or less, or 100 mm or less. Thereby, the size of the peeling 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, 5000 m or more, or 6000 m or more. Thereby, the replacement frequency of the peeling 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 release film roll 100 , the surface roughness (Rp) of the core 10 is sufficiently small, so that deformation of the release film 20 can be suppressed even in the vicinity of the 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 conveyance, or a winding deviation arises.

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 part sheet 40 of FIG. 3 includes the steps of forming the surface 24a of the peeling layer 24 of the peeling film 20 drawn from the peeling film roll using a slurry containing a ceramic powder and an electrode slurry to form a slurry containing a ceramic powder The green sheet 32 and the green sheet 30 of the electrode green sheet 34.

The ceramic green sheet 32 can be formed by coating and drying a ceramic slurry containing ceramic powder. The electrode green sheet 34 can be formed by applying 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. As a dielectric raw material, various compounds which become composite oxides or oxides by firing can be mentioned. For example, carbonates, nitrates, hydroxides, organometallic compounds and the like can be appropriately selected and used. The dielectric raw material is a powder with an average particle size of 4 μm or less, preferably 0.1 to 3.0 μm.

The electrode paste can be, for example, 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 calcination with various oxides, organometallic compounds, and resin hydrochloric acid, etc. It is prepared by mixing with organic media. As the conductor material used in the production of the electrode paste, Ni metal, Ni alloy, or a mixture thereof is preferably used. In order to improve adhesion, the electrode paste may also contain a plasticizer. As a plasticizer, phthalates, such as butyl benzyl phthalate (BBP), adipic acid, phosphoric acid ester, glycols, etc. are mentioned.

The organic vehicle contained in the ceramic slurry and the electrode slurry is prepared by dissolving a binder resin in an organic solvent. Examples of the binder resin used for the organic vehicle include ethyl cellulose, acrylic resin, butyral resin, polyvinyl acetal, polyvinyl alcohol, polyolefin, polyurethane, polyphenylene Ethylene, and their copolymers, etc. Among these, butyral-based resins are preferred, and polyvinyl butyral-based resins are specifically used. The mechanical strength of the ceramic green sheet can be improved by using the butyraldehyde-based resin. One or both of the ceramic paste and the electrode paste may also contain at least one additive selected from the group consisting of various dispersants, plasticizers, antistatic agents, dielectrics, glass frits, insulators, etc. .

The said ceramic slurry is apply|coated to the surface 24a of the peeling layer 24 of the peeling film 20 using, for example, a doctor blade apparatus or the like. Then, the applied ceramic slurry is dried in a drying apparatus, for example, at a temperature of 50 to 100° C. for 1 to 20 minutes to form a ceramic green sheet 32 . The ceramic green sheet 32 shrinks to 5 to 25% compared to before drying.

Then, the above-mentioned electrode paste is printed on the surface 32a of the ceramic green sheet 32 in a specific pattern using, for example, a screen printing apparatus. The electrode green sheet 34 is formed by drying the printed electrode paste in a drying apparatus, for example, at a temperature of 50 to 100° C. for 1 to 20 minutes. 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.

When the thickness fluctuation range of the release film 20 of the release film roll 100 becomes large, the thickness fluctuation of the ceramic green sheet 32 becomes large. The release film 20 pulled from the release film roll 100 is less deformed near the core 10, and the thickness variation of the release film 20 is also small, so the 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 release film 20 in the vicinity of the core 10 is also suppressed, for example, the ceramic green sheet 32 and the electrode green sheet 34 may be formed up to a portion within 300 m from the rear end of the release film 20 on the core 10 side. Blank 30. The green sheet 30 may be formed up to a portion within 250 m from the rear end, or a portion within 200 m. In this way, the release sheet 12 can be effectively utilized up to the vicinity of the core 10, so that the manufacturing cost can be reduced, and the replacement frequency of the release film roll 100 can be reduced, thereby improving the production efficiency of the green sheet 30.

In the ceramic component sheet 40, the thickness fluctuation range of the green sheet 30 including the ceramic green sheet 32 and the electrode green sheet 34 is sufficiently reduced. The reliability of the ceramic parts produced using such a ceramic part sheet 40 is excellent. In addition, such a ceramic component sheet 40 and ceramic components can be manufactured at a low manufacturing cost.

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

A method of manufacturing a ceramic part according to an embodiment of the present invention includes: a lamination step of preparing a plurality of ceramic part sheets, and laminating green sheets of the plurality of ceramic part sheets to obtain a laminate; and a calcination step of laminating the laminate A sintered body is obtained by calcining the body; and an electrode forming step is to form a terminal electrode on the sintered body to obtain a multilayer 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 one of the inner layer portions 92 in the stacking direction. The multilayer ceramic capacitor 90 has terminal electrodes 95 on the side surfaces.

The inner layer portion 92 has a plurality of layers (13 layers in this example) of ceramic layers 96 and a plurality of layers (12 layers in this example) of internal electrode layers 94 . The ceramic layers 96 and the internal electrode layers 94 are alternately laminated. 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 in the same manner as the ceramic green sheet 32, for example.

As an example of the lamination step, the green sheet 30 is obtained by peeling off the release film 20 of the ceramic component sheet 40 shown in FIG. 3 . One surface 30b of this green sheet 30 is laminated on the green sheet for outer layers. The other green sheet 30 is obtained by peeling off the other release film 20 from the other ceramic component sheet 40, and the electrode green sheet 34 of the green sheet after the first peeling and 30b of the other green sheet 30 are laminated so as to face each other. Then, this procedure is repeated to laminate the green sheets 30, whereby a laminate can be obtained. That is, in this lamination step, the release film 20 is peeled off to obtain a green sheet 30, and the green sheets 30 are sequentially laminated. A layered body is formed by repeating this sequence a plurality of times. Finally, lamination of green sheets for outer layers can also be performed.

The number of laminated sheets of the green sheets in the laminated body is not particularly limited, for example, it may be several tens to hundreds of layers. On both end surfaces of the laminated body orthogonal to the lamination direction, green sheets for thick outer layers on which no electrode layers are formed may be provided. After the layered body is formed, the layered body may be cut to form a green chip.

In the firing step, the layered body (green sheet) obtained in the layering step is fired to obtain a sintered body. The calcination conditions may be carried out at 1100 to 1300° C. in a gas atmosphere such as a humidified mixed gas of nitrogen and hydrogen. However, the oxygen partial pressure in the gas atmosphere during calcination is preferably 10 ^-2 Pa or less, more preferably 10 ^-2 to 10 ^-8 Pa. Furthermore, before calcination, it is preferable to perform the debinder process of a laminated body. The debinder treatment can be carried out under normal conditions. For example, when a base metal such as Ni or a Ni alloy is used as the conductor material of the internal electrode layer, the temperature is preferably 200 to 600°C.

After calcination, a heat treatment may be performed in order to reoxidize the dielectric layer constituting the sintered body. The holding temperature or the maximum temperature in the heat treatment is preferably 1000 to 1100°C. The oxygen partial pressure during heat treatment is preferably a higher oxygen partial pressure than 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, and face grinding by sandblasting or the like.

In the electrode formation step, the terminal electrode paste is baked on the side surface of the sintered body to form the terminal electrode 95, whereby the multilayer ceramic capacitor 90 shown in FIG. 4 can be obtained. 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 core 10 of the release film roll 100 . In the release film roll 100, since the thickness fluctuation range of the release film 20 in the vicinity of the core 10 is sufficiently reduced, the thickness fluctuation range of the green sheet 30 can also be sufficiently reduced. Therefore, the green sheet 30 of the release film 20 formed in the vicinity of the winding core 10 can also be used for the manufacture of the multilayer ceramic capacitor 90 .

Such a multilayer ceramic capacitor 90 can suppress the drop in withstand voltage and is excellent in reliability. Therefore, according to the above-mentioned manufacturing method, the multilayer ceramic capacitor 90 excellent in reliability can be manufactured with a high yield. Moreover, since the peeling film 20 which has not been used before can also be used, manufacturing cost can be reduced.

As mentioned above, although some embodiment was demonstrated, this invention is not limited to the said embodiment at all. For example, an example of forming a multilayer ceramic capacitor as a ceramic component has been described, but the ceramic component of the present invention is not limited to a multilayer ceramic capacitor, and may be other ceramic components, for example. The ceramic part 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 make a release film, a release agent solution was prepared in the following procedure. With respect to 100 parts by mass of nonanediol diacrylate, acrylate-modified silicone oil (trade name: X-22-2445, manufactured by Shin-Etsu Chemical Co., Ltd.) 0.415 parts by mass, 100 parts by mass of methyl ethyl ketone, and 100 parts by mass of toluene. These were put into a metal container and stirred and mixed to obtain a colorless and transparent solution.

To the above solution, 2.5 parts by mass of a reaction initiator (trade name: Omnirad127, manufactured by IGM Rasins B.V.) was added to prepare a coating liquid. The coating liquid was extruded from the slit of the coating device and coated on a biaxially stretched polyethylene terephthalate film (PET film, thickness: 31 μm, width direction thickness: 0.46 μm) with a width of 1100 mm ), blowing hot air at a temperature of 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, ultraviolet rays are irradiated in a nitrogen atmosphere with an oxygen concentration of 100 ppm to harden the coating layer to 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 procedure. An optical thickness measuring device was installed between the ultraviolet curing part of the coating device and the winder of the peeling film, and the thickness of the peeling film was measured. Each of the thickness measuring instruments is provided with a detection part for thickness measurement for measuring the peeling layers having mutually different wavelength ranges, and a detection part for thickness measurement of a 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 on the basis of a single side end of the release film. The thicknesses of the peeling layer and the PET film were measured at intervals of 4 mm in the width direction while moving these detection units in the width direction. Each measured value of the peeling layer and the PET film calculated|required by the optical thickness measuring apparatus was added together, and it was set as the thickness of a peeling film. Moreover, while conveying a peeling film, the thickness measurement device was moved back and forth, and the thickness measurement was continued. Thereby, the thickness of a peeling film was measured over the whole length of a peeling film. The average value of the thickness of the peeling layer was 0.5 μm.

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

Use a cutter to cut the release film along the length, and cut out a size of 200 mm in width. This release film was wound up on the core so that the release surface was outside. The winding is performed with an oblique tension in which the tension applied to the release film to be wound is gradually weakened from the start of the winding to the end of the winding. In this way, 5 release film rolls with a roll length of the release film of 4000 m were obtained. Furthermore, the part of 50 mm from both ends of the peeling film before cutting was cut|disconnected and discarded.

For each peeling film roll that was cut, the thickness data of the peeling film measured in the above-mentioned procedure were calculated according to the position of each peeling film, and the thickness fluctuation range in the width direction was obtained for each peeling film roll.

Fiber-reinforced plastic cores for winding are made by impregnating glass fibers with epoxy resin, pressurizing them, and laminating them. The inner diameter of the winding core is 76.2 mm, and the outer diameter is 88.2 mm. Use abrasive paper to grind the outer peripheral surface of the core. The polishing system is performed by gradually changing the polishing paper from coarse eye paper to fine eye paper. Surface treatment is performed in this way to adjust the surface roughness of the outer peripheral surface of the core.

After the 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 by the following procedure using the surface roughness measuring machine (trade name: SJ-210) manufactured by Mitutoyo Co., Ltd. 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 rotation of the core, and the surface roughness is measured on a total of 56 pieces. Among the 56 pieces of Rp, Rv, the maximum value of each was used as the surface roughness Rp, Rv of the outer peripheral surface of the core. The results are shown in Table 1.

From the release film roll obtained by cutting the release film, one release film roll having a thickness variation range of 0.5 μm in the width direction was selected. The release film was pulled out from this release film roll, and a dielectric sheet was produced as a ceramic component sheet in the following procedure. A BaTiO3 _- based powder as a ceramic powder, polyvinyl butyral (PVB) as an organic binder, and methanol as a solvent were prepared, respectively. Next, 10 parts by mass of an organic binder and 165 parts by mass of a solvent were blended with respect to 100 parts by mass of the ceramic powder, and kneaded with a ball mill to obtain a dielectric slurry.

The release film roll is placed in a coating machine, and the dielectric slurry is coated on the release layer side of the release film pulled out from the release film roll, and a dielectric blank is formed on the release film. The thickness of the dielectric green sheet was set to 0.9 μm. The thickness was continuously measured using a transmission-type X-ray film thickness meter (trade name: AccureX, manufactured by FUTEC) installed on a production line. The coating of the dielectric paste was completed in a state where 100 m of the release film wound around the core remained. Then, the release film was pulled out from the core in an uncoated state and moved in the coating machine, and the movement was stopped in a state where the release film remained on the core by 70 m. The average value of the thickness of the dielectric green sheets and the variation width of the thickness (thickness variation width) were investigated based on the data measured by the transmission type X-ray film thickness meter. In addition, the thickness fluctuation range was calculated|required from the average value, the maximum value, and the minimum value of thickness. That is, the larger value of the absolute value of the maximum value and the average value and the absolute value of the minimum value and the average value is used as the thickness variation range.

The thickness variation of the dielectric green sheet was 0.03 μm from the front end side of the release film where the dielectric paste was started to the remaining 500 m portion. On the other hand, the thickness variation of the dielectric green sheet in the portion from the remaining 500 m to the remaining 100 m (the portion on the rear end side of the peeling film) was 0.04 μm. Various conditions and results are summarized in Table 1.

(Examples 2 to 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, in the same manner as in Example 1, a dielectric green sheet was formed on the release film drawn out from the release film roll, and the thickness fluctuation range was investigated. The results are shown in Table 1.

(Example 4, 5) A PET film was produced by casting molten polyethylene terephthalate from a nozzle provided with a slit to a cooling drum. At this time, by adjusting the gap of the slit more precisely, a PET film whose thickness variation range in the width direction was different from that of Example 1 was obtained. A release film was produced in the same manner as in Example 1 except that this PET film was used, and a release film roll having a smaller thickness variation in the width direction than in 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 fluctuation range of the dielectric green sheet was investigated. The results are shown in Table 1.

(Example 6) PET films were produced in the same manner as in Examples 1, 4, and 5. At this time, the slit gap was not adjusted more precisely than in Examples 1, 4, and 5, and a PET film was produced. Thereby, the PET film whose thickness fluctuation range in the width direction was different from that of Examples 1, 4, and 5 was obtained. A release film was produced in the same manner as in Example 1 except that this PET film was used, and a release film roll having a larger thickness variation in the width direction than in Example 1 was obtained. 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 fluctuation 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 the core made of fiber-reinforced plastic. The core made of ABS 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. 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 fluctuation range was investigated. The results are shown in Table 1.

(Example 8) A release film was produced in the same manner as in Example 1, except that the same core as in Example 2 was used, the same release film as in Example 4 was used, and the winding length was set to 8000 m. The thickness fluctuation range 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 that the same core as in Example 3 was used, the same release film as in Example 4 was used, and the winding length was set to 6000 m. The thickness fluctuation range 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 that the same core as in Example 3 was used, the same release film as in Example 5 was used, and the winding length was set to 8000 m. The thickness fluctuation range 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 blank was formed on the release film pulled out from the release film roll in Example 1, the roll core was reused to produce the release film roll of Example 1 again. A dielectric green sheet is again formed on the release film drawn 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 drawn from the release film roll were repeated 30 times in total. The thickness variation of the dielectric green sheets produced for the 30th time was investigated. 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 with the release surface as the inner side in the winding to the core. Then, in the same manner as in Example 1, a dielectric green sheet was formed on the release film drawn out from the release film roll, and the thickness fluctuation range was investigated. The results are shown in Table 1.

(Comparative Example 1) A release film roll was produced in the same manner as in Example 1, except that only the outer peripheral surface of the core was ground with coarse-grained abrasive paper to change the surface roughness of the outer peripheral surface of the core. Then, in the same manner as in Example 1, a dielectric green sheet was formed on the release film drawn out from the release film roll, and the thickness fluctuation 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 a PET film having a different thickness fluctuation range was used, and the length of the release film wound around the core was changed as shown in Table 1. In the same manner as in Comparative Example 1, on the release film drawn from the release film roll, a dielectric green sheet was formed longer than in Comparative Example 1 according to the winding length, and the thickness fluctuation range was investigated. The results are shown in Table 1. The film thickness variation of the dielectric green sheet started to increase from about 500 m, and the film thickness changed particularly greatly from 300 m.

(Comparative Example 3) In place of the core made of FRP, the core of bakelite whose outer peripheral surface roughness is shown in Table 1 was used. A release film roll was obtained in the same manner as in Example 1 except that the roll core was used. 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 fluctuation range was investigated. The results are shown in Table 1. The film thickness variation of the dielectric green sheet started to increase from about 500 m, and the film thickness changed particularly greatly from 300 m.

[Table 1] Core material Surface roughness of core (μm) Variation in thickness of release film The winding length of the peeling film roll Thickness Variation of Dielectric Green Sheet (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, on the core side, that is, on the rear end side (500 m to 100 m) of the release film, the thickness fluctuation range of the dielectric green sheet became large. In a multilayer ceramic capacitor obtained by laminating and firing such a dielectric green sheet, there is a concern that a breakdown in withstand voltage will occur. On the other hand, in Examples 1 to 12, on the core side, that is, on the rear end side (500 m to 100 m) of the release film, the thickness fluctuation range of the dielectric green sheet was also reduced. Capacitors obtained by laminating and firing such dielectric green sheets have high withstand voltage and excellent reliability. Moreover, according to the result of Example 11, the core made of fiber-reinforced plastic can be used repeatedly, and it was confirmed that it is excellent also in durability. On the other hand, although the thickness of the core made of ABS in Example 7 has a small variation in the thickness of the dielectric green sheet, the core is deformed after use, making it difficult to reuse. [Industrial Availability]

ADVANTAGE OF THE INVENTION According to this invention, the release film roll which can utilize a release film effectively to the core vicinity can be provided. Moreover, this invention can provide the manufacturing method which can manufacture a ceramic component sheet|seat and a ceramic component with high productivity by using such a peeling film roll. Furthermore, the present invention can provide a ceramic component sheet and ceramic component excellent in reliability.

10: roll core 20: peel off film 22: substrate film 24: Peel layer 24a: Surface of peeling layer 30: blanks 30b: One side of the blank 32: Ceramic green sheet 32a: Surface of ceramic green sheet 34: Electrode blank 40: Ceramic parts sheet 90: MLCC 92: inner layer 93: Outer Department 94: Internal electrode layer 95: Terminal electrode 96: Ceramic layer 100: peel off film roll

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

10: roll core

20: peel off film

100: peel off film roll

Claims (9)

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, The surface roughness (Rp) of the outer peripheral surface of the core is 1.5 μm or less. The release film roll according to claim 1, wherein the thickness variation in the width direction of the release film is 0.5 μm or less. The release film roll according to claim 1 or 2, wherein the above-mentioned roll core comprises fiber-reinforced plastic. The release film roll according to any one of claims 1 to 3, wherein the outer diameter of the core is 170 mm or less, and the length of the release film wound around the core is 4000 m or more. A method for producing a ceramic part sheet, comprising the steps of: using a slurry containing a ceramic powder, on the above-mentioned peeling layer of the above-mentioned peeling film drawn from the peeling film roll according to any one of claims 1 to 4 A ceramic green sheet is formed on the surface. The method for producing a ceramic component sheet according to claim 5, 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 of manufacturing a ceramic part, which has the following steps, namely, Using the above-mentioned ceramic part sheet obtained by the manufacturing method as claimed in claim 5 or 6 to obtain a laminate comprising the above-mentioned ceramic green sheet; and calcining the above-mentioned layered body to obtain a sintered body; and This ceramic part includes the above-mentioned sintered body. A ceramic component sheet obtained by forming a green sheet containing a ceramic green sheet on the surface of the above-mentioned release layer of the above-mentioned release film drawn from the release film roll of any one of claims 1 to 4. A ceramic part provided with a sintered body, the sintered system forming a laminate of ceramic green sheets comprising the ceramic part sheet as claimed in claim 8, and obtained by calcining the laminate.

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