JP2007038178A - Powder adhesive application method - Google Patents

Abstract

The present invention provides a practical powder adhesive having a practical material formulation and a practical and specific coating method.
SOLUTION: A polyester resin having a softening point of 120 ° C., 100% by mass, a charge control agent of 1% by mass, and a polyethylene wax of 3% by mass are prepared, mixed, melt-kneaded, cooled, coarsely crushed, pulverized, classified and averaged Powder particles having a volume particle size of 9 μm are formed, and 100% by mass of the powder particles and 1% by mass of fine silica as an external additive are mixed and sieved to obtain a powder adhesive. Leave only the developing unit of the image forming unit capable of monochrome printing of the printer, remove the others, store the powder adhesive in the developing unit, and directly powder the paper conveyed by the conveying belt with the developing roller of the developing unit. The body adhesive is transferred and fixed with a fixing device.
[Selection] Figure 1

Description

  The present invention relates to a powder adhesive application method, and more particularly to a powder adhesive application method in which a toner-like powder adhesive is applied to a paper surface.

Conventionally, in order to transmit character information only to a specific individual, generally, the character description is in a sealed form so that the individual can confirm the character information only after opening.
In recent years, personal information protection has become a strict question, and various business establishments, for example, personal information such as various personal data, gradebooks, salary statements, etc., are printed on the printed part of the written text. It is recorded and distributed in the form of envelopes or cards by bonding or crimping the peripheral edge of the printed part or the entire surface of the written text.

  Among these, postcard-sized cards are called crimped postcards and can be used at the same charge as regular postcards. Therefore, as a printing information concealment system that is highly convenient for information providers, advertising It is also widely used for advertising direct mail.

  In order to use such a printing information concealment system for crimping postcards, etc., secret information has conventionally been created by entrusting it to a specialized manufacturer or introducing an expensive crimping postcard or other manufacturing / printing device. .

  There are two methods for creating confidential information using a manufacturing / printing device such as a crimping postcard, such as a method of applying adhesive after information printing or a method of applying adhesive before information printing. The premise of creating a large amount of information is essential and expensive.

Further, such outsourcing to a manufacturer is not a preferable method for creating confidential information because there is a potential problem of leakage of personal information.
By the way, in recent years, along with the development of personal computers and printers, there has been proposed one that can easily create a crimp postcard even in a small unit so that it can be used by small-scale offices and individuals.

  For example, postcard paper with release paper pre-applied with a pressure sensitive adhesive is on the market. In this method, after printing predetermined character information or the like on the printing surface inside the two-fold, the pressure-sensitive adhesive portion is crimped to complete a postcard for postage.

  For example, a set of adhesive film and postcard paper is sold. In this method, after printing predetermined character information or the like on the printing surface inside the double fold, the adhesive film is pressure-bonded with the adhesive film sandwiched inside the double fold so that a postcard for posting can be created.

  However, this is unavoidable, and it is inevitable that handling is complicated, and it is better to make several crimping postcards personally, but it is cheap, quick, and responsive to demand in a certain number of sheets. It can not be created with.

  Therefore, a toner-like adhesive composed of microcapsules containing an adhesive is transferred onto the surface of the substrate by electrostatic printing and flash-fixed. At the time of adhesion, the microcapsules are destroyed by pressure and the adhesive in the capsule is leached. In this way, a proposal has been made that it is possible to easily create a pressure-bonded postcard. This proposal also suggests a pulverized toner obtained by melting, kneading, and pulverizing an adhesive. (For example, refer to Patent Document 1.)

  In addition, the pressure bonding substance is put into a replacement printing cartridge for an office printer or a copying machine, and the pressure bonding substance is applied to a government postcard or envelope by the same operation as the printing operation by the office printer or copying machine. After that, a proposal has been made that it can be applied to a dedicated crimping machine, and a single printer or copying machine can be used to reach the dedicated crimping machine. In addition, this proposal suggests that a crimping substance is applied to one side of a fold and one side of a center of a fold. (For example, see Patent Document 2.)

In addition, a method has been proposed in which an image is created on demand by an electrophotographic method using toner containing a heat-sensitive adhesive. In this proposal, the softening temperature of the heat-sensitive adhesive is configured to be higher than the softening temperature of the binder resin of the toner for electrophotography, and the ratio of the heat-sensitive adhesive to the toner for electrophotography is 5 to 5. It has been proposed that the composition be 60% by weight and that the composition of the heat-sensitive adhesive contains at least one selected from the group consisting of a heat-adhesive resin, a hot melt, and waxes. (For example, refer to Patent Document 3.)
JP 09-104849 A (paragraphs 0005, 0014, FIG. 1, FIG. 3, FIG. 6) JP 2000-006553 A (summary, no figure) Japanese Patent Laying-Open No. 2004-126231 (paragraphs 0085 to 0087, not shown)

  However, although the technology of Patent Document 1 describes the configuration and composition of the microcapsule toner, the pulverized toner is merely suggested to the extent that it is conceived, and the specific composition, production method, There is no description about the usage, and this makes it possible for even those skilled in the art to produce useful pulverized toners and, of course, not even make prototypes.

  In addition, the technology of Patent Document 2 is to create a print information concealment document by a public postcard or envelope before being applied to a dedicated crimping machine, and it is convenient in that it must be applied to the dedicated crimping machine to complete for posting. It must be said that it is lacking in performance and economy and is far from being responsive to demand.

  In the technique of Patent Document 3, the softening temperature of the heat-sensitive adhesive is simply set higher than the softening temperature of the binder resin of the toner for the electrophotographic system. There is no explanation of prescription.

  By the way, as a method of creating a pressure-sensitive postcard that is responsive to demand, a powder adhesive that can be used by being housed in a toner cartridge of a small electrophotographic printer that can be used personally is specifically realized. It is considered that the powder adhesive may be applied to the paper surface on which variable information is printed (or printed, the same applies hereinafter) by the same printer by developing, transferring and fixing.

  However, if the adhesive is applied to the paper after printing using an electrophotographic printer, the powder adhesive must be applied as an adhesive unless it is of the same form as a normal toner ( Development, transfer, and fixing) are considered impossible.

  However, although the powder adhesive for toner-like pressure-adhesive postcards is suggested to the extent of conceiving in the above-mentioned patent documents, which are the conventional proposed technologies, the specific material formulation is also specific as described above. Neither usage is disclosed.

Also, such a toner adhesive powder adhesive for postcards has not been distributed to the market to date. The pressure-sensitive adhesive for postcards in circulation is only liquid or adhesive sheet.
An object of the present invention is to provide a practical and specific coating method by preparing a practical powder adhesive made of a specific material formulation in view of the above-described conventional situation.

  The powder adhesive application method of the present invention is a powder adhesive application method in which a toner-like powder adhesive is applied to a sheet, and the powder adhesive is directly transferred from a coating device to the sheet using static electricity. Configured to do.

  In this powder adhesive application method, for example, the above paper is transported on the surface of a transfer sheet, a transfer roller is arranged in contact with the back surface of the transfer sheet, and a voltage is applied to the transfer roller. A voltage pattern is generated, and the applied voltage pattern is applied to the sheet via the transfer sheet, and the powder adhesive is directly transferred to the sheet from the coating device.

  In this case, the coating device moves away from the transfer sheet when the sheet is not in the transfer unit and moves to the retracted position, and moves from the retracted position when the sheet is in the transfer unit to move onto the transfer sheet. It is comprised so that it may contact | abut.

  Further, in this powder adhesive application method, for example, the transfer roller is electrically divided into a plurality of locations in the longitudinal direction of the roller, and the applied voltage pattern is generated by applying the voltage individually for each division. You may comprise as follows.

  In this case, the applied voltage pattern applied to the transfer roller is preferably formed, for example, as a potential of at least 1/10 of the potential of the application portion or a reverse polarity potential in the non-application portion of the paper.

  In this powder adhesive application method, the powder adhesive transferred to the paper is fixed on the paper by a fixing device to complete the application.

  According to the present invention, the applied voltage pattern formed on the transfer roller is applied to the paper via the transfer sheet, and the powder adhesive is directly transferred and fixed from the coating device to the paper by the static electricity. It is possible to provide a practical and specific method for applying a powder adhesive that is easy to perform.

Embodiments of the present invention will be described below with reference to the drawings.
(Embodiment 1)
First, a material prescription and a specific manufacturing method of a powder adhesive made of a toner-like thermoplastic resin powder will be described.

  100% by mass of a polyester resin having a softening point of 120 ° C. as a binder resin, 1% by mass of a charge control agent LR-147 made by Nippon Carlit as a charge control agent, and 3% by weight of polyethylene wax NP-056 made by Mitsui Chemicals as a wax. Prepare%.

  These were mixed with a chemical mixer, the mixture was melt-kneaded by a twin screw extruder, cooled, and coarsely crushed. Further, the coarsely pulverized product is pulverized by an I-type jet mill, and the pulverized product is classified to obtain powder particles having an average volume particle size of 9 μm.

  Then, 100% by mass of the powder particles and 1% by mass of fine silica RY-50 manufactured by Nippon Aerosil Co., Ltd., which is an external additive as a fluidity improver, are mixed by a Henschel mixer, and the mixture. And a toner-like powder adhesive was obtained.

Next, an apparatus for applying the above powder adhesive will be described.
FIG. 1 is a cross-sectional view illustrating the internal configuration of an electrophotographic image forming apparatus (hereinafter referred to as a coating / printing printer) as a powder adhesive coating apparatus.

  As shown in FIG. 1, the application / printer printer 1 includes an image forming unit 2, a duplex printing conveyance unit 3, and a paper feeding unit 4. The image forming unit 2 has a configuration in which four image forming units 5 (5-1, 5-2, 5-3, 5-4) are arranged in a multistage manner.

  Of the four image forming units 5, the three image forming units 5-1, 5-2, and 5-3 on the upstream side in the paper conveyance direction (right side in the drawing) are magenta (M ), Cyan (C), and yellow (Y) color toners are formed, and these three colors are overlaid on the paper to form a full-color image.

  The image forming unit 5-4 at the most downstream side in the sheet conveying direction originally forms a monochrome image using black (K) toner such as dark portions of characters and color images. However, since a black image can be obtained by recoating three colors of MCY with solid coating, in this example, the image forming unit 5-4 is applied with powder adhesive without using black (K) toner. Renovated exclusively. This will be described in detail later.

  Each of the image forming units 5-1, 5-2, and 5-3 has the same configuration except for the developer (color) accommodated in the developing unit. Therefore, hereinafter, the configuration of the image forming unit 5-3 will be described as an example.

  The image forming unit 5 is assembled to the photosensitive drum 6, the cleaner 7 disposed along the circumferential surface of the photosensitive drum 6, the charging roller 8, the developing unit 9, and the opening on the lower side surface of the developing unit 9. The developing roller 11 is provided.

  An optical writing head 12 on the main unit side is disposed in the vicinity of the upper surface located between the charging roller 8 and the developing unit 9 of the photosensitive drum 6, and is conveyed as a transfer sheet in the vicinity of the lower surface of the photosensitive drum 6. A belt 13 is provided. The transfer device 14 is pressed toward the lower surface of the photosensitive drum 6 with the conveying belt 13 interposed therebetween.

  The conveying belt 13 is made of a conductive sheet-like member made of resin containing conductive carbon or an ion conductive material, is stretched over the driving roller 15 and the driven roller 16 and is driven by the driving roller 15, and is opposite to the drawing. Circulate in a clockwise direction.

A cleaning blade 20 a of the belt cleaner 20 is in contact with the lower circulation movement portion of the conveyor belt 13.
In the application / printer 1 of this example, when the full-color printing mode is selected, the upper circulation moving portion of the conveyor belt 13 contacts the photosensitive drums 6 of the three image forming units 5-1, 5-2, and 5-3. The image forming unit 5-4 is retracted to the upper retracted position.

  In the monochrome printing mode, the upper circulation movement unit of the conveyance belt 13 moves downward so as to be separated from the photosensitive drums 6 of the three upstream image forming units 5-1, 5-2, and 5-3. Normally, the image forming unit 5-4 is configured to be in contact with only the developing roller 11 having a configuration in charge of black toner image formation (in this example, direct application of powder adhesive).

  The photosensitive drum 6 rotates in the clockwise direction in the figure. First, by applying charge from the charging roller 8, the peripheral surface of the photosensitive drum 6 is uniformly charged and initialized. Next, an electrostatic latent image is formed on the peripheral surface of the photosensitive drum 6 by optical writing from the optical writing head 12 based on the print information.

The electrostatic latent image is converted into a toner image (development) by the toner stored in the developing unit 9 by the developing process by the developing roller 11.
The toner image developed on the peripheral surface of the photosensitive drum 6 in this way reaches a transfer portion where the photosensitive drum 6 and the transfer device 14 face each other as the photosensitive drum 6 rotates.

  On the other hand, a large number of cut sheets 18 are accommodated in the sheet feeding cassette 17 of the sheet feeding unit 4. The sheet 18 is unloaded from the sheet feeding cassette 17 by one rotation of the sheet feeding roller 19, and is fed to the standby roller pair 22 through the conveyance guide path 21. Alternatively, the paper is fed to the standby roller pair 22 by the paper feed roller 25 from the MPF tray 24 mounted on the opened mounting portion 23.

  The standby roller pair 22 feeds the paper 18 onto the transport belt 13 at a timing when the print start position of the paper 18 coincides with the front end of the toner image on the photosensitive drum 6 of the image forming unit 5-1 at the most upstream in the paper transport direction.

  The sheet 18 is electrostatically attracted to and conveyed by the upper surface of the circulating conveyor belt 13 and moves together with the conveyor belt 13 directly below the photosensitive drum 6 from the upstream side to the downstream side in the sheet conveying direction.

  Then, the first color toner image is transferred to the sheet 18 by the transfer unit of the image forming unit 5-1, and the toner image of the next color is transferred by the transfer unit of the image forming unit 5-2. The third toner image is transferred at the transfer section -3.

  In the printing process in the full color printing mode in this example, the image forming units 5-1, 5-2, and 5-3 are set to the printing state, and the image forming unit 5-4 Move away from the contact position.

  The sheet 18 on which the three color toner images are transferred as described above is carried into the fixing unit 26. The fixing unit 26 includes a heat roller 26a, a pressure roller 26b, and a cleaner 26c. While the paper 18 is nipped and conveyed between the heat roller 26a and the pressure roller 26b, the toner image is melted and pressed onto the paper surface. To settle. The cleaner 26c removes the toner remaining on the heat roller 26a.

  As described above, the sheet 18 on which the toner image is fixed by the fixing unit 26 is discharged out of the apparatus with the image forming surface facing upward by the carry-out roller 28 when the switching plate 27 is rotated upward. When the plate 27 is rotated downward, it is guided upward by the conveying roller 29 and is discharged to the paper discharge unit 32 by the paper discharge roller 31 with the image forming surface down.

  The duplex printing conveyance unit 3 is configured to be detachable from the apparatus main body, and is a unit that is mounted when performing duplex printing by the application / printing printer 1 of this example. The duplex printing transport unit 3 has a plurality of transport rollers 33a to 33e disposed therein.

  In the case of duplex printing, the sheet 18 is once sent upward by the switching plate 27. For example, when the rear end of the sheet 18 reaches the conveying roller 29, the conveyance of the sheet 18 is stopped and the sheet 18 is moved in the reverse direction. Transport to.

  By this control, the paper 18 is conveyed downward on the left side of the switching plate 27 set at the position indicated by the dotted line, is carried into the paper conveyance path of the duplex printing conveyance unit 3, and the paper is returned by the conveyance rollers 33a to 33e. The

  The returned paper 18 again passes through the conveyance guide path 21 and reaches the standby roller pair 22 and is sent to the transfer unit at the same timing as the toner image as described above, and the toner image is transferred to the back surface of the paper.

  In the application of the powder adhesive, the monochrome printing mode is set, and the conveying belt 13 is separated downward from the image forming units 5-1, 5-2, and 5-3. Then, the image forming unit 5-4 responsible for applying the powder adhesive descends from the upper retracted position, and the developing roller 11 comes into contact with the conveyance belt 13.

A circuit board on which such a control device for controlling the operation of each component is mounted is mounted on the electrical unit 34 between the duplex printing transport unit 3 and the paper feed unit 4.
Although not specifically shown, the control device includes a printer controller and an engine controller. The printer controller includes a CPU (central processing unit) composed of a microprocessor and the like, and a program ROM (Read Only Memory), page buffer, image memory, video transfer circuit, I / F (interface) controller, etc. connected to the CPU. Composed.

The video transfer circuit is connected to a printer engine which is an external circuit, and the I / F controller is connected to a host computer or the like.
The program ROM stores a program for operating the control device in cooperation with the host computer, and the CPU executes control of print processing based on print information transmitted from the host computer based on the program.

  The I / F controller inputs print information transmitted from the host computer. The page buffer temporarily stores print information for a plurality of pages input from the host computer in units of pages, and the image memory develops a bit image for one sheet (one page).

  The video transfer circuit transfers the bit image data developed in the image memory to the engine controller line by line, and outputs an interrupt signal to the CPU for each line transfer. Thereby, the CPU recognizes the transferred area of the image memory and develops the image data of the subsequent page.

  Further, during the powder adhesive application process, the CPU changes the print mode to the monochrome print mode as described above, lowers the image forming unit 5-4 from the standby position, and performs various processes as described later. Apply the powder adhesive to the paper with the transfer pattern.

  On the other hand, the engine controller is also provided with a CPU and a program ROM (not shown). An image formation execution command is input from the CPU of the printer controller to the CPU of the engine controller.

When the CPU of the engine controller receives the image formation execution command, it controls the motor engine (drive driver), not shown in FIG. 1, to rotate the motor.
The power of the motor is supplied through a gear system (not shown) to the sheet feeding roller 19 or 25, the photosensitive drum 6 or the dielectric roller 34, each part of the developing unit 9 (developing roller 11, supply roller, stirring member, etc.), fixing unit. 26 heat rollers 26a and pressure rollers 26b, carry-out rollers 28, transport rollers 29, and the like. Thereby, driving of the above-described image forming process is started.

  FIG. 2 is a diagram schematically illustrating the configuration of the image forming unit 5-4 on the most downstream side in the sheet conveyance direction and the vicinity thereof. In FIG. 2, parts having the same configuration or the same functions as those in FIG. 1 are given the same numbers as in FIG.

  FIG. 2 also shows a doctor blade 35 and a supply roller 36 in the developing unit 9 whose explanation is omitted in FIG. Further, the transfer device 14 is shown as a transfer roller 14 '. A metal roller 37 is in contact with the lower surface of the transfer roller 14 '.

  As shown in FIG. 2, in the image forming unit 5-4 and the configuration in the vicinity thereof, the other image forming unit 5 has a photosensitive drum 6, a cleaner 7, a charging roller 8, and between the charging roller 8 and the developing unit 9. The optical writing head 12 which has been arranged in the above is removed. That is, only the developing unit 9 (hereinafter 9-4) is provided.

A transfer portion T is formed at the opposite portion between the developing roller 11 and the transfer roller 14 ′ of the developing unit 9-4.
In the developing unit 9-4, the above-described powder adhesive is accommodated. The supply roller 36 of the developing unit 9-4 supplies the powder adhesive to the developing roller 11 while rubbing it while rotating in the same direction as the developing roller 11 (counterclockwise direction indicated by arrows a and b).

  As a result, the powder adhesive is charged with a triboelectric charge (in this example, it is negatively charged). The powder adhesive supplied to the developing roller 11 is regulated to a certain layer thickness by the doctor blade 35, and charging is further strengthened by the regulation friction. The negatively charged powder adhesive is transferred to the paper 18 at the transfer portion T by the electrostatic force of the charge.

  That is, a positive voltage is applied to the transfer roller 14 ′ from the metal roller 37, and this positive voltage is applied to the back side of the paper 18 through the conductive layer on the surface of the transfer roller 14 ′ and the transport belt 13. As a result, the sheet 18 is charged with positive polarity with respect to the developing roller 11, and the powder adhesive charged with negative polarity is transferred to the sheet 18.

  When the paper 18 is under the developing roller 11, a positive voltage is applied from the metal roller 37 to the transfer roller 14 ′. When there is no paper 18 under the developing roller 11, the voltage application is stopped.

  In this case, since positive charges remain on the conveyance belt 13, the powder adhesive on the developing roller 11 may be transferred onto the conveyance belt 13. In order to prevent this problem, the developing unit 9-4, which is a powder adhesive application device, is moved to the upper retracted position and physically separated from the transport belt 13. Thus, the structure is such that excess powder adhesive is not transferred to the conveyor belt 13.

  The powder adhesive image transferred onto the paper 18 as described above is sent to the fixing unit 26 and fixed. In this fixing, the powder adhesive transferred to the paper 18 is melted by heating from the heat roller 26 a and fixed to the paper 18.

The paper 18 on which the powder adhesive image has been fixed is discharged out of the machine. That is, the application of the powder adhesive is completed.
(Embodiment 2)
By the way, in the case of a three-fold crimping postcard, the coating pattern is divided into two types in the application of the powder adhesive to the three-fold crimping postcard. A coating method in this case will be described below as a second embodiment.

  FIG. 3 (a) is a view showing a transfer roller and a three-fold crimping postcard to which the powder adhesive is transferred by the transfer roller, and FIG. 3 (b) is a cross-sectional view centering on the transfer roller. FIG. 3C shows an example of the voltage applied to the transfer roller.

  As shown in FIG. 3 (a), the transfer roller 38 of this example is electrically divided into a plurality of locations (in this example, three locations of segmented regions 38-1 to 38-3) in the longitudinal direction of the roller. The application of voltage is individually controlled for each section to generate an applied voltage pattern.

  As shown in FIG. 3 (a), the surface having the surface 39-1 on which the address of the three-fold crimped postcard 39 is affixed is written on the inner surface 39-2. The body adhesive 41 is applied.

  In this case, a transfer voltage as shown in FIG. 3C is applied to the divided regions 38-2 and 38-3 of the transfer roller 38. In this example as well, the charging polarity of the powder adhesive 41 is set to be negative.

  Here, the configuration around the transfer roller 38 (partition regions 38-1 to 38-3) will be described. As shown in FIG. 3B, the transfer roller 38 is configured by covering the shaft 42 with an insulating layer 43 made of insulating rubber, and further depositing a conductive layer 44 thereon.

  The upper surface of the conductive layer 44 is in contact with the inner surface of the upper circulating movement portion of the conveyor belt 13, and the metal roller 37 is in contact with the lower surface of the conductive layer 44. A voltage is applied from the metal roller 37 to the conductive layer 44. The

  When the above voltage is applied, as shown in FIG. 3 (c), when the preceding three-fold postcard 39 is in the transfer portion T (see FIG. 2), that is, in the application state (time t1 to t2), A predetermined positive voltage supplied from a bias power source (not shown) is applied from the metal roller 37 to the transfer roller 38.

By applying the transfer voltage, the powder adhesive 41 is transferred to the three-fold crimping postcard 39 as shown in FIG. 3A and fixed by the fixing unit 26.
When the three-fold postcard 39 passes through the transfer portion T and the three-fold postcard 39 is not in the transfer portion T, that is, in the non-application state (time t2 to t3), the transfer roller 38 has 0V. A voltage having a potential of near or reverse polarity is applied.

As a result, it is possible to prevent a problem that the powder adhesive 41 is unnecessarily transferred to the transport belt 13 in the non-application state.
Subsequently, during the period (time t3 to t4) until the next three-fold postcard 39 is conveyed to the transfer portion T and passes through, a predetermined positive voltage supplied again from the bias power source is applied from the metal roller 37 to the transfer roller 38. Applied.

When the three-fold postcard 39 passes through the transfer portion T (from t4), a voltage having a potential of about 0 V or a reverse polarity is applied to the transfer roller 38.
When the three-fold folded postcard 39 is continuously conveyed to the transfer portion T, the above-described applied voltage pattern is repeated.

Subsequently, the back surface having the surface 39-3 describing the non-confidential information of the three-fold crimping postcard 39 is coated with the powder adhesive 41 on the inner surface 39-4 when being folded in three. .
In this case, a transfer voltage as shown in FIG. 3C is applied to the divided regions 38-1 and 38-2 of the transfer roller 38.

  By applying the transfer voltage, the powder adhesive 41 is transferred to the three-fold crimping postcard 39 as shown in FIG. 3A and fixed by the fixing unit 26.

FIG. 2 is a cross-sectional view illustrating an internal configuration of an application / printing printer as the powder adhesive application device according to the first embodiment. FIG. 2 is a diagram schematically illustrating a configuration of an image forming unit on the most downstream side in the sheet conveyance direction of the application / printing printer in the first embodiment and the vicinity thereof. (a), (b), (c) is a figure explaining the structure of the transfer roller in Embodiment 2, and the coating method of a powder adhesive.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Application | copier printer 2 Image formation part 3 Duplex printing conveyance unit 4 Paper feed part 5 (5-1, 5-2, 5-3, 5-4) Image formation unit 6 Photosensitive drum 7 Cleaner 8, 8a, 8b Charging roller 9 Developing unit 11 Developing roller 12 Optical writing head 13 Conveying belt 14 Transfer device 14 'Transfer roller 15 Drive roller 16 Driven roller 17 Paper feed cassette 18 Paper 19 Paper feed roller 20 Belt cleaner 20a Cleaning blade 21 Conveyance guide path 22 Standby Roller pair 23 mounting section 24 MPF tray 25 paper feed roller 26 fixing unit 26a heat roller 26b pressure roller 26c cleaner 27 switching plate 28 carry-out roller 29 transport roller 31 paper discharge roller 32 paper discharge section 33a to 33e transport roller 34 electrical section 35 doctor Blade 36 Supply roller 37 Metal roller 38 Transfer roller 38-1 to 38-3 Segment area 39 Tri-fold crimping postcard 41 Powder adhesive 42 Shaft 43 Insulating layer 44 Conductive layer

Claims (6)

A powder adhesive application method for applying a toner-like powder adhesive to paper,
A method for applying a powder adhesive, wherein the powder adhesive is directly transferred from a coating device to paper using static electricity. Transport the paper on the surface of the transfer sheet,
Place the transfer roller in contact with the back surface of the transfer sheet,
Applying a voltage to the transfer roller to generate an applied voltage pattern;
Applying the applied voltage pattern to the paper via the transfer sheet to transfer the powder adhesive directly to the paper from the coating device;
The method of applying a powder adhesive according to claim 1.   The application device moves away from the transfer sheet when the sheet is not in the transfer unit and moves to the retracted position, and moves from the retracted position when the sheet is in the transfer unit to move the sheet on the transfer sheet. The powder adhesive coating method according to claim 2, wherein the powder adhesive is abutted on the surface.   3. The transfer roller according to claim 1, wherein the transfer roller is electrically divided into a plurality of locations in a longitudinal direction of the roller, and the applied voltage pattern is generated by applying the voltage individually for each of the divisions. Powder adhesive application method.   5. The applied voltage pattern applied to the transfer roller is formed as a potential of at least 1/10 of the potential of the application portion or a reverse polarity potential in the non-application portion of the paper. Powder adhesive application method. 6. The powder adhesive according to claim 1, wherein the powder adhesive transferred to the paper is fixed on the paper by a fixing device and coating is completed. Application method.

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