WO2017047723A1

WO2017047723A1 - Peeling member and manufacturing method therefor

Info

Publication number: WO2017047723A1
Application number: PCT/JP2016/077344
Authority: WO
Inventors: 和夫廣瀬
Original assignee: Ntn株式会社
Priority date: 2015-09-15
Filing date: 2016-09-15
Publication date: 2017-03-23

Abstract

Provided is a peeling member obtained by forming a resin coating film on a metal plate, with which it is possible to prevent, over a long period, the attachment of a sheet of paper directly after fixing. Further provided is a manufacturing method for the peeling member, with which it is possible to form, in the surface of the resin coating film, a fine crevice for preventing paper attachment. A peeling member 1 has a peeling sheet 1a, which comprises a plate-shaped backing 2 and a resin coating film 4 formed on at least a paper-feeding-side surface of the backing 2. The peeling member 1 peels a sheet of paper from a fixing member of an electrophotographic device by bringing the tip part 1c of the peeling sheet 1a into contact with, or close to, the fixing member. The paper-feeding-side surface of the resin coating film 4 has a patterned section 5 comprising a groove 5a, which is a plurality of crevices, but no crevices are present in the backing 2 at the base portion of the crevices. The patterned section 5 is formed after a resin coating material is applied and dried but before the resin coating material is baked.

Description

Peeling member and manufacturing method thereof

The present invention relates to a peeling member for peeling a sheet from a fixing member such as a fixing roller and a fixing belt installed in an electrophotographic apparatus such as a copying machine or a laser beam printer, and a manufacturing method thereof.

An electrophotographic apparatus such as a copying machine or a laser beam printer is provided with a heat fixing device for developing an electrostatic latent image formed on a photosensitive drum on a sheet using a developer such as toner and fixing the image thereafter. It has been. The heat fixing device includes a fixing member such as a fixing roller and a fixing belt for fixing the toner on the sheet by heating and melting the developer and pressurizing the developer.

For the fixing member and the pressure roller that presses the paper against the fixing member, a sheet that peels off the paper on which the developer is fixed from the roller or the like in order to prevent the paper from being wound around the roller and preventing smooth operation. A shaped release member is used. As such a peeling member, in order to improve the paper peelability and prevent the paper from being soiled due to toner adhesion, an increasing number of the peeling members are covered with a fluororesin.

For example, Patent Document 1 has been proposed as a peeling member in which the tip of a substrate is covered with a fluororesin film. In patent document 1, the fluororesin film is affixed on the base-material surface via the silicone type adhesive (refer patent document 1). Patent Document 2 has been proposed as a peeling member in which the tip of the substrate is covered with a fluororesin coating film by coating. In patent document 2, spherical fillers, such as a resin balloon, a ceramic balloon, and a glass balloon, are added to this fluororesin coating film (refer patent document 2).

In addition, in Patent Document 3, a form in which a dimple-like recess is provided on the sheet-passing surface of a sheet metal as a base material and a large number of recesses are formed on the surface of the resin film, or a number of through holes are provided in the sheet-passing surface of the sheet metal. The form which affixed the fluororesin film on the top and formed the recessed part in the paper passing surface is proposed (refer patent document 3).

Patent Documents

2 and 3 reduce the contact area with the paper so that the paper can be smoothly separated from the roller.

JP 2001-235959 A JP 2011-008103 A JP 2011-043763 A

However, in recent developers employed in electrophotographic apparatuses, the binder resin, which is one of the constituent elements of the toner, has also shifted to a highly transparent polyester system in order to improve the color developability. Toner with polyester-based binder resin is very sticky, so the sheet is adsorbed to the flat sheet-passing surface of a release sheet with a fluororesin film or a release member covered with a resin coating, and jamming occurs. There is a fear.

In the peeling member described in Patent Document 2, spherical fillers may aggregate or distribution may vary. In this case, certain unevenness cannot be obtained, and a difference occurs in the non-adsorption force partially. As a result, the paper cannot be discharged smoothly, and jamming may occur. Moreover, since the peeling member of patent document 3 forms a recessed part in the base material side, and forms a recessed part on the surface of a resin film or a resin film as a result, the minimum diameter of a recessed part is about 5 mm. growing. Further, if the interval between the concave portions is reduced, the strength of the base material is affected. Therefore, an interval of several millimeters is necessary, and the paper may be adsorbed on the flat portion of several millimeters. In particular, there is a risk of jamming on a sheet that is solidly printed on a thin sheet.

Due to the recent high resolution of electrophotographic devices, high printing speed, compactness, and the complicated flow of paper due to the built-in double-sided copy function, the paper and the peeling member adsorb even slightly (stick). There is a possibility that jamming or paper folding may occur and desired operation quality cannot be maintained.

The present invention has been made in order to cope with such a problem, and in a peeling member having a structure in which a resin coating film is formed on a metal plate or the like, a peeling member capable of preventing the adsorption of paper immediately after fixing for a long period of time, And it aims at providing the manufacturing method of the peeling member which can form the fine recessed part for paper adsorption | suction prevention on the resin coating film surface.

The release member of the present invention has a release sheet comprising a plate-like base material and a resin coating film formed on at least the paper passing side surface of the base material, and the release sheet is used as a fixing member of an electrophotographic apparatus. A peeling member that peels off the paper from the fixing member by bringing the leading end, which is the end on the upstream side in the paper passing direction, into contact with or close to the long side of the paper, and the resin coating is applied to the surface of the paper passing side It has a plurality of recesses, and the base material of the base portion of the recesses has no recesses.

Here, “contact” means that one side (tip portion) of the release sheet makes line contact with the axial direction of a fixing member such as a roller. Further, “adjacent” means that one side (tip portion) of the release sheet is arranged close to the roller to such an extent that the paper can be prevented from being wound around the roller. Note that the fixing member has various shapes such as a roller shape, a film shape, or a belt shape that can come into contact with the paper in a process of fixing the developer on the unfixed paper on the paper by pressurizing simultaneously with heating. Refers to a member. For example, a fixing roller and a pressure roller.

The recesses are streak-like grooves that are inclined in one direction or two directions with respect to the sheet passing direction, and are aligned at regular intervals along the longitudinal direction of the release sheet.

The resin coating film is a resin coating film containing at least a fluororesin powder and a graphite powder in a matrix resin, and the resin coating film comprises 25 to 70 parts by weight of the fluororesin with respect to 100 parts by weight of the matrix resin. It contains 1 to 20 parts by weight of the above graphite. The matrix resin is a polyamideimide (hereinafter referred to as PAI) resin. The fluororesin is a polytetrafluoroethylene (hereinafter referred to as PTFE) resin, and the graphite is graphite having 97.5% or more of fixed carbon.

The manufacturing method of the peeling member of the present invention is a method of manufacturing the above-described peeling member of the present invention, and this manufacturing method applies a resin paint containing a matrix resin to at least the paper passing side surface of the base material of the above-described peeling member. A coating film forming process for forming a resin coating film by drying and a coating film baking process for baking and curing the resin coating film, and after the coating film forming process and before the coating film baking process. Furthermore, it has a recessed part formation process which processes and forms the part which becomes the said recessed part after the said coating-film baking process on the paper passing side surface of the said resin coating film.

The concave portion is a streak-like groove that is inclined in one direction or two directions with respect to the sheet passing direction, and is aligned at a constant interval along the longitudinal direction of the release sheet. In the recess forming step, the outer peripheral surface is formed by pressing an inclined gear-shaped rotating member while rotating the rotating member on the surface of the resin coating film.

The release member of the present invention has a release sheet comprising a plate-like base material and a resin coating film formed on at least the paper passing side surface of the base material, and the resin coating film has its paper passing side surface. Since the substrate has a plurality of recesses, and the base material of the base portion of the recesses does not have a recess, the document has excellent paper peelability and non-toner adhesion and has an image ratio of 90% or more. In this case, an image can be obtained without being attracted and jammed by the peeling member. Moreover, since the uneven | corrugated process etc. on the base material side are unnecessary, the horizontal accuracy (straightness accuracy) of a peeling sheet front-end | tip part can be maintained highly, and there are few variations in quality.

The concave portions are streak-like grooves that are inclined in one direction or two directions with respect to the paper passing direction and are aligned at regular intervals along the longitudinal direction of the release sheet. Further, it is possible to prevent the sheet from being adsorbed immediately after fixing. Further, the contact with the paper becomes a linear contact, and image deterioration such as uneven gloss of the image and gloss streaks can be prevented.

The resin coating film is a resin coating film containing at least a fluororesin and graphite in a matrix resin. The resin coating film comprises 25 to 70 parts by weight of fluororesin and 1 to 1 part of graphite with respect to 100 parts by weight of the matrix resin. Since it contains 20 parts by weight, the resin coating film is excellent in low friction and wear resistance. Moreover, since the matrix resin is a PAI resin, it is excellent in heat resistance, wear resistance and adhesion to the substrate.

The method for producing a peeling member according to the present invention includes a coating film forming step of forming a resin coating film by applying a resin paint containing a matrix resin to at least a paper passing side surface of a base material of the peeling member, and then drying the resin coating film. A coating film baking process for baking and curing the coating film, and after the coating film forming process, before the coating film baking process, on the paper passing side surface of the resin coating film, and to be the concave portion after the coating film baking process A recess forming step of processing and forming the portion; In other words, by sandwiching a recess forming step between the coating film forming step and the coating film baking step, a recess is easily formed on the resin coating in a soft state immediately after coating and drying, and this is baked and cured. Thus, a resin coating having the recess can be formed. As a result, the surface of the release member is finer than the case where a concave portion is formed on the surface after the coating film is formed (after firing) or the case where the concave portion is formed on the substrate side surface before the resin coating film is formed. A precise recess can be formed.

The recesses are streak-like grooves that are inclined in one direction or two directions with respect to the paper passing direction, and are aligned at regular intervals along the longitudinal direction of the release sheet. In the forming step, the rotating member whose outer peripheral surface is inclined gear-shaped and pressed against the surface of the resin coating is formed while being rotated, so that the productivity is excellent.

It is a schematic diagram of a fixing device using the peeling member of the present invention. It is a perspective view which shows an example of the peeling member of this invention. It is a figure which shows the manufacturing process of the peeling member of this invention. It is a figure which shows the manufacturing process flow of the manufacturing method of this invention. It is a perspective view which shows the peeling member of a comparative example.

A fixing device using the peeling member of the present invention will be described with reference to FIG. FIG. 1 is a schematic diagram of a heat roller type fixing device using a peeling member. The fixing device includes a heater 6a, the fixing roller 6 that rotates in the direction of arrow A, the pressure roller 7 that contacts the fixing roller 6 and rotates in the direction of arrow B, and the fixing roller 6 and the pressure roller 7 are in contact with each other. And the peeling member 1 disposed in the vicinity of the nip portion 8 formed in this manner. The toner image formed on the paper 9 is fixed at the nip portion 8 and becomes a fixed image. The peeling member 1 is provided at a position in contact with or close to the fixing roller 6 so that the paper 9 that has passed through the nip portion 8 can be peeled off from the fixing roller 6.

An example of the peeling member of the present invention will be described with reference to FIG. FIG. 2 is a perspective view of the peeling member. As shown in FIG. 2, the peeling member 1 includes a peeling sheet 1a and a support member 1b that supports and fixes the peeling sheet 1a. The release sheet 1a is formed by forming a resin coating film 4 on the surface of a substrate 2 having a substantially rectangular planar shape. The black arrow in the drawing is the paper passing direction, and the longitudinal direction of the release sheet 1a is orthogonal to the paper passing direction. In the release sheet 1a and the base material 2, the surface opposite to the surface supported and fixed to the support member 1b is the paper passing side surface. The leading end 1c, which is the upstream end of the release sheet 1a in the release member 1 in the sheet passing direction, is disposed at a position close to the fixing roller, and the end of the sheet peeled off from the fixing roller is picked up (see FIG. 1). ). The peeling member 1 has a pattern portion 5 including a plurality of concave portions 5a along the longitudinal direction on the surface of the resin coating film 4 in the vicinity of the front end portion that comes into contact with the sheet immediately after fixing.

The resin coating film 4 only needs to be formed on at least the surface of the base material on the side through which the paper passes (surface on the paper passing side). In the form of FIG. 2, it is formed on both the front and back surfaces of the base material 2 so as to cover the front edge of the front end portion 2 a of the base material 2. The resin coating film 4 has the above-described pattern portion 5 on the paper passing side surface, and the base material 2 of the base portion of the concave portion has no concave portion. This structure can be obtained by forming a pattern portion on the surface of the coating film without applying any processing to the substrate side and before baking after applying and drying the resin paint. The resin coating 4 can prevent the adsorption of the sheet immediately after fixing for a long period of time.

The pattern portion 5 on the paper passing side surface of the resin coating film 4 is formed from a plurality of recesses 5a. The range of the pattern portion 5 is formed in a portion that is in sliding contact with the paper. The shape of the recess is not particularly limited, and can be any shape such as a dimple recess or a recess. Moreover, the depth of this recessed part may reach the base material surface. As the concave groove, for example, a geometric pattern groove such as a one-way oblique pattern groove or an iris pattern groove can be used. In the form shown in FIG. 2, the pattern portion 5 is a unidirectional oblique pattern groove. The one-way oblique pattern groove and the iris pattern groove are formed of streak-like grooves that are inclined in one direction or two directions (iris) with respect to the paper passing direction and are aligned at a predetermined interval. These pattern grooves have, for example, a groove width of 1.0 mm or less, a groove interval of 0.1 mm to 5.0 mm, and an inclination angle of 15 ° to 45 ° with respect to the sheet passing direction. The dimple concave holes are, for example, a diameter of φ0.2 mm to φ2.0 mm and an interval of 0.5 mm to 2 mm. By forming the pattern portion composed of the fine recesses as described above, the toner on the heated and pressurized paper is suppressed from being adsorbed to the peeling member of the paper, and jamming of the paper can be prevented. Excellent.

The resin coating film 4 is obtained by coating the base material 2 with a resin paint. The resin coating is obtained by dispersing or dissolving a matrix resin and other compounding agents that are solids in solvents. The detail of the formation method of the resin coating film 4 is mentioned later.

As the matrix resin, any resin having excellent adhesion and heat resistance can be used. Specifically, PAI resin, polyphenylene sulfide resin, polyether ether ketone resin, polyimide resin, polyamide resin, epoxy resin, phenol resin, and the like can be given. Among these, it is preferable to use a PAI resin because it is excellent in heat resistance, wear resistance, and adhesion to a substrate.

Solvents for dispersing these matrix resins include ketones such as acetone and methyl ethyl ketone, esters such as methyl acetate and ethyl acetate, aromatic hydrocarbons such as toluene and xylene, methyl chloroform, trichloroethylene, and trichlorotrifluoroethane. Organic halogenated compounds such as N-methyl-2-pyrrolidone (NMP), methylisopyrrolidone (MIP), dimethylformamide (DMF), dimethylacetamide (DMAC) and other aprotic polar solvents Can be illustrated. These solvents can be used alone or as a mixture. The kind of solvent and the liquid viscosity may be adjusted according to the application method of the resin paint.

In order to further improve the frictional wear characteristics and the like in the resin coating film of the peeling member, it is preferable to blend at least a fluororesin powder and a graphite powder as a compounding agent in the matrix resin described above.

Fluorine resin can be used as long as it can impart low friction and non-adhesiveness to the resin coating film and has heat resistance. Examples of the fluororesin include PTFE resin, tetrafluoroethylene-perfluoroalkyl vinyl ether (PFA) copolymer resin, tetrafluoroethylene-hexafluoropropylene (FEP) copolymer resin, and tetrafluoroethylene-ethylene (ETFE) copolymer. Polymer resin etc. are mentioned. Among these, it is preferable to use PTFE resin powder.

When PTFE resin powder is used, its average particle diameter (measured value by laser analysis method) is not particularly limited, but is preferably 30 μm or less in order to maintain the surface smoothness of the resin coating film.

As the PTFE resin powder, a PTFE resin obtained by heating and baking at a melting point or higher can be used. Further, a powder obtained by further irradiating a heat-fired powder with γ rays or electron beams can also be used. These PTFE resin powders are superior in uniform dispersibility in a resin coating and superior in wear resistance of the formed resin coating film, compared to PTFE resins (molding powder, fine powder) that are not heated and fired. .

Fluorine resin such as PTFE resin is preferably blended in an amount of 25 to 70 parts by weight based on 100 parts by weight of the matrix resin in the resin coating. When the blending amount of the fluororesin is less than 25 parts by weight, the low friction property is deteriorated, and there is a risk that accelerated wear due to heat generation occurs. On the other hand, when the blending amount of the fluororesin exceeds 70 parts by weight, the low friction property is excellent, but the strength and abrasion resistance of the coating film may be deteriorated.

It is well known that graphite has excellent properties as a solid lubricant. Graphite is roughly classified into natural graphite and artificial graphite, and any of them can be used. The shape includes flakes, granules, and spheres, but any of them can be used. Further, it is preferable to use graphite having 97.5% or more of fixed carbon, and artificial graphite having 98.5% or more of fixed carbon is more preferable.

The graphite is preferably blended in an amount of 1 to 20 parts by weight with respect to 100 parts by weight of the matrix resin in the resin coating. When the blending amount of graphite is less than 1 part by weight, a sufficient effect cannot be obtained when graphite is blended. On the other hand, if the blending amount of graphite exceeds 20 parts by weight, the adhesiveness of the resin coating film is impaired, which may cause peeling.

The resin coating film may contain other additives in addition to the matrix resin, the fluororesin, and the graphite as long as the necessary characteristics of the peeling member of the present invention are not significantly reduced. If the total amount of additives such as fluororesin and graphite relative to the matrix resin is less than 15 parts by weight, unevenness occurs in the resin coating film, making it difficult to obtain the required dimensional accuracy.

Further, it is preferable that the tensile shear adhesive strength of the resin coating film is 25 MPa or more. In this case, the adhesion strength between the base material of the peeling member and the resin coating film is increased, and it can be used stably. If the PAI resin is used as the matrix resin and the resin coating film includes the fluororesin powder and the graphite powder in the above-described preferred blending range, a tensile shear bond strength of 25 MPa or more can be achieved.

The front end portion 2a of the substrate 2 is, for example, a portion within a width of 4 mm from the front end edge to the downstream side in the paper passing direction. The tip 2a of the substrate 2 becomes the tip 1c of the release sheet 1a. Note that the release sheet peels the sheet by bringing the leading end portion into contact with or close to the fixing member, and therefore the leading end portion 1c of the release sheet 1a is the upstream end portion in the sheet passing direction.

The material of the substrate 2 is not particularly limited as long as it can stably contact or approach the front end of the release sheet to the fixing member, and a metal material or a resin material can be adopted. As the metal material, for example, iron, aluminum, copper, stainless steel or the like can be adopted. In particular, stainless steel is preferable because it does not rust, is easy to process, and is inexpensive. The resin material may be any resin having heat resistance that can withstand baking of the resin coating film, and heat-resistant resins such as fiber reinforced liquid crystal resin, polyphenylene sulfide resin, and polyimide resin can be employed. When using a resin material, the resin board used as a base material can be shape | molded by injection molding or extrusion molding using these resin materials.

The thickness of the metal plate or resin plate used as the substrate 2 is preferably in the range of 50 to 300 μm. If it is less than 50 μm, the peeling force may not be ensured, and there is a risk of deformation during jamming. If the thickness exceeds 300 μm, the paper to be peeled may hit the leading edge of the release sheet and cause jamming. Moreover, the base material 2 has a contact width L (see FIG. 2) having substantially the same length as the axial length of the roller. Since the contact width is large, the contact pressure per unit area to the roller is reduced, and local wear on the roller surface can be prevented. The length substantially the same as the length of the roller in the axial direction refers to a length to the extent that the above effect can be obtained. Specifically, the length is at least about half of the length in the axial direction of the roller. Same or slightly longer.

Further, it is preferable that the thickness direction of the tip 2a upstream of the base material 2 in the sheet passing direction is a curved surface without an edge. By making the thickness direction of the end portion a curved surface, the surface of the fixing member is not damaged even when the pressure member is in contact with the fixing member such as the fixing roller or the fixing belt at a pressure higher than a constant pressure. Moreover, it becomes easy to form a resin coating film on the tip 2a.

As shown in FIG. 2, the support member 1b is a thick plate, and holes 3 used for fixing the peeling member to the fixing device main body are provided on the left and right in the longitudinal direction of the support member 1b. As the material of the support member 1b, the same material as that of the base material 2 described above can be adopted. The plate thickness of the thick plate constituting the support member 1b is preferably 0.8 mm or more in order to ensure sufficient strength for attaching the base material 2.

The method for fixing the substrate 2 and the support member 1b is not particularly limited. When the base material 2 is a metal plate and the support member 1b is a thick metal plate, they are joined by welding or the like. When joining by welding, it is preferable to join by laser spot welding in which spot portions are provided in parallel to the longitudinal direction in order to prevent deterioration of the horizontal accuracy of the distal end portion 2a due to a shape change of the base material 2.

The manufacturing method of the present invention is a method for manufacturing such a peeling member. The manufacturing method of the peeling member of this invention is demonstrated based on FIG. 3 and FIG. FIG. 3 is a schematic view showing the steps of the manufacturing method, and FIG. 4 is a flowchart of the manufacturing method. In the manufacturing method of the present invention, after preparing the base material of the peeling member, (1) the coating film forming step, (2) the recess forming step, and (3) the coating film baking step are performed in this order. In particular, the present invention is characterized in that a recess forming step is sandwiched between a coating film forming step and a coating film baking step (dotted line portion in FIG. 4) which are normally performed continuously. Each step will be described below.

First, as shown in FIG. 3A, a base member 2 of a peeling member is prepared. As the base material 2, a material in which the above-described metal plate or resin plate is fixed to the support member 1 b is prepared. Here, the formation surface of the resin coating on the metal substrate is roughened to an uneven shape by shot blasting, tumbler, machining, or chemical surface treatment in order to improve the adhesion with the resin coating. It may be applied to form a fine uneven shape. In addition, fixation with the base material 2 and the supporting member 1b can be performed in arbitrary steps, and after completion | finish of a coating film (after baking) may be sufficient.

(1) Coating film forming step This step is a step of forming a resin coating film 4 by applying a resin paint containing a matrix resin to the surface of the substrate 2 and drying it as shown in FIG. is there. As described above, the resin coating is obtained by dispersing or dissolving a matrix resin that is a solid content and other compounding agents in solvents. The method for applying the resin paint to the surface of the substrate 2 is not particularly limited, and for example, a method such as spray coating can be employed. Also, powder coating such as electrostatic coating can be adopted. The resin paint may be applied to at least the sheet passing side surface of the substrate 2.

The drying in this step is performed to such an extent that a recess can be formed in the next recess formation step. At this stage, the solvents contained in the resin coating are vaporized. In a state where a lot of solvents remain in the resin paint, the resin coating film has fluidity, and even if the recess is formed by transfer or the like, the paint flows and is crushed. Even if a part of the solvent remains in the resin coating film, it may be dried until the fluidity is such that the grooves are not crushed when the recess is formed. Moreover, in the case of powder coating, it moves to the next process in the gel-like soft state before hardening of the gelled state. Specifically, the ratio of the solid component in the resin coating film is 70% by weight or more. This can be easily managed by measuring the product weight before painting, immediately after painting, and after drying.

Further, by setting the film thickness of the resin coating film after drying to 12 to 36 μm, the resin coating film after firing can be formed to a desired film thickness. When finishing is performed after firing, the thickness of the resin coating film after drying may be formed to 20 to 50 μm.

(2) Concave formation process As shown in FIG.3 (c), this process processes and forms the part (concave part 5a ') which becomes a recessed part which comprises a pattern part on the surface of the resin coating film 4 after a coating-film baking process. It is a process to do. The resin coating film 4 obtained in the previous coating film forming step has a lower hardness and a softer state than the resin coating film after firing. This step is carried out immediately after the coating film forming step using this. The concave portion 5a ′ formed in this step becomes the pattern portion 5 on the surface of the resin coating film in the final peeling member after firing in the next step. The shape of the pattern portion formed by the recess 5a ′ and the shape of the final pattern portion 5 are substantially the same.

The shape of the recess is as described above. When the recesses are inclined in one direction or two directions with respect to the paper passing direction, and each of them is a streak-like groove aligned along the longitudinal direction of the release sheet, that is, a one-way diagonal pattern groove or iris In the case of the pattern groove, as shown in FIG. 3C, it can be formed by pressing the rotating member 10 whose outer peripheral surface is an inclined gear shape while rotating it on the surface of the resin coating film 4. Examples of the rotating member 10 include a knurling piece and a gear.

(3) Coating Film Baking Step As shown in FIG. 3D, this step is a step of baking and curing the resin coating film in which the concave portions are formed in the previous concave portion forming step. Baking is performed for a predetermined time at a baking temperature corresponding to the matrix resin. Through this baking step, the resin coating film is baked and hardened to obtain a strong resin coating film 4 having a pattern portion 5 having a predetermined shape. In addition, the thickness of the resin coating film after baking is about 20% thinner than the film thickness before baking.

The thickness of the resin coating on the peeling member 1 is about 10 μm to 30 μm. As long as the grooves are not crushed, the surface of the resin coating film after the firing step may be shaved with a polishing machine to perform final finishing. The peeling member 1 having the pattern portion 5 obtained by this manufacturing method can reduce the direct sliding area with the paper due to the fineness of the pattern portion 5.

Example 1
A peeling member 1 shown in FIG. Details are as follows. A thin metal plate (base material 2) made of stainless steel (SUS304CSP) having a thickness of 200 μm was cut into a length of 300 mm and a width of 40 mm, and burrs generated on the cut surface were carefully removed. Next, a thick metal plate (support member 1b) made of stainless steel (SUS304CSP) having a thickness of 1 mm was cut into a length of 360 mm and a width of 40 mm, and 10 mm of the plate was bent into an L shape by 90 °. Also, φ8 holes 3 were provided on the left and right. A metal thin plate was laser welded to the metal thick plate. At that time, the front end portion 2a adjacent to the fixing roller of the thin metal plate was welded in a state of protruding 5 mm from the thick metal plate. The metal thin plate was spray-coated with a slidable resin coating material (Bearly FL7067 manufactured by NTN Precision Resin Co., Ltd.) whose matrix resin is PAI resin, and then dried in a drying oven at 90 ° C. for about 10 minutes. At this time, the film thickness of the resin coating film was 24 μm. After drying, quickly remove the peeling member from the drying furnace, and press the knurled piece (Ishida Machine Tool Co., Ltd., QUICK, pitch 0.8 mm, 30 ° R) on the portion that is in sliding contact with the paper on the surface of the resin coating 4. A unidirectional oblique pattern groove (pattern part 5) having a groove width of 11 mm and a depth of 30 μm was formed along the longitudinal direction. Thereafter, the resin coating film was baked and cured at 240 ° C. for 1 hour. The film thickness of the resin coating after baking was 20 μm.

The peeling member of Example 1 was set in the fixing portion of a heat roller type test copying machine (fixing temperature 190 ° C., A4 copying speed 57 sheets / min), and a line chart with an image ratio of 80% was used as a document, and A4 normal After passing 1,000 sheets of paper continuously, using an original with an image ratio of 99% and using A4 plain paper, it was confirmed whether jamming could occur due to sticking. did it. No adhesion or damage of toner was observed on the resin coating film confirmed after the paper passing test.

Comparative Example 1
A peeling member 11 shown in FIG. This peeling member 11 was created with the same material, dimensions, and procedure as in Example 1 except that the unidirectional oblique groove was not formed on the surface of the resin coating 13 on the substrate 12.

The peeling member was set in the test copying machine used in Example 1, and the same copying test by continuous paper passing as in Example 1 was performed. As a result of the test, the paper peeling apparatus of Comparative Example 1 used a line chart with an image ratio of 80% as a document, and completed continuous 1,000 sheets using A4 plain paper, but the image ratio was 99%. As soon as an image was printed using A4 plain paper using a manuscript, the paper was attracted to the peeling member and jamming due to sticking occurred.

The peeling member of the present invention is a peeling member formed by forming a resin coating on a metal plate or the like, and can prevent adsorption of paper immediately after fixing for a long period of time. It can be suitably used as a peeling member for peeling the paper from the roller.

DESCRIPTION OF SYMBOLS 1 Peeling member 2 Base material 3 Hole 4 Resin coating film 5 Pattern part formed from several recessed part 6 Fixing roller 7 Pressure roller 8 Nip part 9 Paper 10 Rotating member

Claims

It has a release sheet consisting of a plate-like base material and a resin coating film formed on at least the paper passing side surface of the base material, and passes through the fixing member of the electrophotographic apparatus on one long side of the release sheet. A peeling member that peels off the paper from the fixing member by bringing the leading end, which is the end on the upstream side in the paper direction, into contact or close proximity,
The said resin coating film has a some recessed part in the paper passing side surface, and the said base material of the base part of this recessed part does not have a recessed part, The peeling member characterized by the above-mentioned.
2. The concave portion is a streak-like groove that is inclined in one direction or two directions with respect to a sheet passing direction, and is aligned at a predetermined interval along the longitudinal direction of the release sheet. The peeling member as described.
The resin coating film is a resin coating film containing at least a fluororesin powder and a graphite powder in a matrix resin, and the resin coating film comprises 25 to 70 parts by weight of the fluororesin with respect to 100 parts by weight of the matrix resin. The peeling member according to claim 1, comprising 1 to 20 parts by weight of the graphite.
The peeling member according to claim 3, wherein the matrix resin is a polyamide-imide resin.
4. The peeling member according to claim 3, wherein the fluororesin is a polytetrafluoroethylene resin, and the graphite is graphite having a fixed carbon of 97.5% or more.
It is a manufacturing method of the peeling member according to claim 1,
The manufacturing method includes a coating film forming step of forming a resin coating film by applying a resin coating containing a matrix resin to at least a paper passing side surface of the base material of the peeling member, and baking the resin coating film. And a coating film baking process to be cured,
After the coating film forming step, before the coating film baking step, the sheet passing side surface of the resin coating film has a recess forming step for processing and forming a portion that becomes the recess after the coating film baking step. A method for producing a release member.
The concave portion is a streak-like groove that is inclined in one direction or two directions with respect to the paper passing direction, and is aligned at a constant interval along the longitudinal direction of the release sheet,
7. The stripping member according to claim 6, wherein the streak-like groove is formed by pressing a rotating member having an inclined gear-shaped outer peripheral surface against the surface of the resin coating film in the recess forming step. Production method.