JP4814173B2 - Bug filter for collecting fine particles - Google Patents

Description

  The present invention relates to a filter medium for collecting fine particles and a filter member using the same, and more particularly to a filter medium used for a bag filter or a cartridge filter installed in a fluidized bed granulation coating apparatus or the like.

2. Description of the Related Art Conventionally, in the manufacturing field of foods and pharmaceuticals, powder processing apparatuses such as fluidized bed granulation coating apparatus and rolling granulation coating apparatus are often used for granulation and coating processing of granular particles. . Among these powder processing apparatuses, the fluidized bed apparatus forms a fluidized bed of granular material in the processing container by fluidized air introduced from the bottom of the processing container, and sprays a spray liquid on the fluidized bed. The granule is granulated or coated. At that time, in order to prevent the fine particles in the raw material from rising and being mixed with the exhaust gas and being discharged out of the processing system, the fluidized bed apparatus generally has a bag filter or a cartridge filter in the upper part (filter chamber) of the processing container. There is a filter for collecting fine particles called. Polyester fibers are often used for these filters in terms of fiber strength and durability, woven fabrics made of polyester fibers are used for bag filters, and nonwoven fabrics made of polyester fibers are used for cartridge filters. Yes.
JP 2006-144142 A JP 2002-282627 A Japanese Patent No. 3398256

  However, in the filter material for collection using a polyester fiber woven fabric, fine powder particles during filtration are likely to adhere to the surface. For this reason, removal of fine particles is performed by swinging the bag filter (shaking) or blowing away the adhering material by backwash air from the back surface of the filter medium (the side where no fine particles are attached). It has been broken. However, even with such a removal process, the fine particles cannot be completely removed, so that the attached fine particles gradually accumulate on the filter surface, which not only reduces the filtration efficiency but also reduces the product recovery rate. Arise. Accordingly, if the filtration efficiency is lowered to some extent, the filter must be washed, and the granulation process during that time is interrupted, resulting in a problem that productivity is lowered.

  Furthermore, since polyester fibers are easily charged, there is a risk of dust explosion in the processing chamber, and it is difficult to wipe off fine particles on the surface of the filter medium due to static electricity at the time of shaking or backwashing air operation. For this reason, when a filter material made of polyester fiber is used, it is necessary to devise various means for releasing static electricity generated in the filter. When sewing the filter, a metal thread such as stainless steel is sewn and the main body of the apparatus is sewn from the thread. Anti-static measures such as connecting to the ground via the cable were taken. For example, in a bag filter, a metal thread sewn in the filter is brought into contact with a stainless steel jig that suspends the bag filter to make a ground connection.

  On the other hand, in order to solve such problems of polyester fibers, the use of fluororesin fibers excellent in peelability of powder raw materials has been conventionally studied. However, since the mechanical strength of fluororesin fibers is lower than that of polyester fibers, in filters using fluororesin fibers as filter media, the filter may be damaged due to rocking motion (shaking) to remove the raw materials. was there. In addition, there is a risk that the filter may be damaged due to contact with metal parts when the filter is mounted, and there is a problem that it cannot withstand the use of the granulation coating equipment. Further, when backwashing air is sprayed onto a filter using a nonwoven fabric made of fluororesin fibers, there is a problem that fuzz is likely to occur, and fine particles are more likely to adhere.

  The object of the present invention is that it is difficult for fine particles to adhere during filtration, and it is easy and safe to deal with the charging property, and even if fine particles are attached, it can be easily done by shaking or backwashing air. Another object of the present invention is to provide a filter medium that can be shaken off from the surface of the filter medium, a bag filter and a cartridge filter using the filter medium, and a granulation coating apparatus.

The bag filter for collecting fine particles according to the present invention is a filter medium that is arranged in a granulation coating apparatus and is made of a woven fabric using fluororesin fibers and polyester fibers and containing 50 to 95% by weight of the fluororesin fibers. A bag filter for collecting fine particles formed using the bag filter, wherein the bag filter is formed in a bottomed cylindrical shape, and includes a cylindrical side wall portion that constitutes a collection unit for filtering the fine particles, and the bag filter. A bottom surface portion provided with a suspendable lower portion, and the cylindrical side wall portion is formed by the filter medium, while the bottom surface portion is formed on a woven fabric made of polyester fibers and conductive neutralizing fibers. It is characterized by being formed .

  In the present invention, since the filter medium has a hybrid configuration composed of fluororesin fibers and other fibers, the fluororesin fibers have excellent fine particle releasability while ensuring filter strength with the other fibers. The characteristics of can be utilized. For this reason, it is possible to apply a filter using fluororesin fibers with excellent peelability to the granulating coating device, extend the usable time of the filter, and minimize maintenance due to filter clogging. Therefore, it is possible to improve productivity in the granulation coating process. Moreover, since the amount of raw material adhering to the filter is reduced, the product recovery rate can be improved.

  The filter medium may be a woven fabric in which fibers other than fluororesin fibers selected from fluororesin fibers and natural fibers or chemical fibers are woven, or selected from fluororesin fibers and natural fibers or chemical fibers. Nonwoven fabrics using fibers other than fluororesin fibers may be used. Moreover, the fiber used with the said fluororesin fiber may be a polyester fiber. Furthermore, the fiber used together with the fluororesin fiber may be a conductive fiber. This makes it possible to eliminate the charge of the filter and improve safety. In addition, the fluororesin fiber may be 10 to 100% by weight, preferably 50 to 95% by weight, particularly preferably 70 to 95% by weight of the filter medium.

Alternatively, the filter medium may be sewn in a cylindrical shape to form the cylindrical side wall, and a reinforcing member formed of a polyester woven cloth may be disposed in the vicinity of the sewn joint. At this time, the bag filter may be sewn with a PTFE sewing thread. Furthermore, you may arrange | position the reinforcement member formed with the polyester woven fabric in the junction part vicinity of the said cylindrical side wall part and the said bottom face part.

In addition, the suspended portion may be formed of a woven fabric made of polyester fibers and conductive static eliminating fibers, and metal yarns or resin conductive yarns may be used as the static eliminating fibers.

On the other hand, the bag filter is provided with an opening connected to the opening of the bag filter, and a planar base member using a fluororesin fiber and a fiber other than a fluororesin fiber selected from natural fibers or chemical fibers may be joined to the outer peripheral portion of the base member may be provided an outer edge which is formed by using a polyester fiber.

  Further, the cartridge filter for collecting fine particles of the present invention is a cartridge filter for collecting fine particles having a collecting portion in which filter filters are alternately folded into a pleat shape and formed into a cylindrical shape. The collection part is formed by using a filter medium for collecting fine particles using a fluororesin fiber and a fiber other than a fluororesin fiber selected from natural fibers or chemical fibers.

  Furthermore, the granulation coating apparatus of the present invention has a collection unit using a filter medium for collecting fine particles using a fluororesin fiber and a fiber other than a fluororesin fiber selected from natural fibers or chemical fibers. A bag filter for collecting fine particles and a cartridge filter for collecting fine particles are mounted. Such a filter is less likely to be clogged and has a long usable time, so that the productivity of the granulation coating process is improved and the manufacturing cost is reduced. Moreover, since the amount of raw material adhering to the filter is reduced, the product recovery rate can be improved.

  According to the filter medium for collecting fine particles of the present invention, the filter medium is made up of fluororesin fibers and fibers other than fluororesin fibers selected from natural fibers or chemical fibers, so that the filter strength is secured. In addition, it is possible to provide a filter medium having excellent fine particle releasability. For this reason, for example, it becomes possible to apply a filter using a fluororesin fiber having excellent releasability to a granulating coating device, etc., to extend the usable time of the filter, and to perform maintenance due to filter clogging. It is possible to minimize the productivity and improve the productivity of the granulation coating process. Further, since the amount of raw material attached to the filter is reduced, it is possible to improve the product recovery rate.

  According to the bag filter for collecting fine particles of the present invention, collection using a filter medium for collecting fine particles using fluororesin fibers and fibers other than fluororesin fibers selected from natural fibers or chemical fibers. Therefore, it is possible to provide a bag filter having excellent fine particle releasability while ensuring filter strength. For this reason, the filter usable time can be extended. For example, when the filter is applied to a granulating coating device, maintenance due to filter clogging is minimized, and the productivity of the granulating coating process is reduced. Improvement can be achieved. Further, since the amount of raw material attached to the filter is reduced, it is possible to improve the product recovery rate.

  Moreover, according to the cartridge filter for collecting fine particles of the present invention, a filter medium for collecting fine particles using a fluororesin fiber and a fiber other than a fluororesin fiber selected from natural fibers or chemical fibers is used. Since it has a collection part, it becomes possible to provide the bag filter excellent in the peelability of a fine particle, ensuring filter strength. For this reason, the filter usable time can be extended. For example, when the filter is applied to a granulating coating device, maintenance due to filter clogging is minimized, and the productivity of the granulating coating process is reduced. Improvement can be achieved. Further, since the amount of raw material attached to the filter is reduced, it is possible to improve the product recovery rate.

  On the other hand, the granulation coating apparatus of the present invention has a collection part using a filter medium for collecting fine particles using fluororesin fibers and fibers other than fluororesin fibers selected from natural fibers or chemical fibers. Since the bag filter for collecting fine particles is mounted, maintenance due to filter clogging can be minimized, and productivity of the granulation coating process can be improved. Further, since the amount of raw material attached to the filter is reduced, it is possible to improve the product recovery rate.

  In addition, another granulating and coating apparatus of the present invention is a collecting unit using a filter medium for collecting fine particles using a fluororesin fiber and a fiber other than a fluororesin fiber selected from natural fibers or chemical fibers. Since the cartridge filter for collecting fine particles having the above is mounted, maintenance due to filter clogging can be minimized, and productivity of the granulation coating process can be improved. Further, since the amount of raw material attached to the filter is reduced, it is possible to improve the product recovery rate.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a front view showing an appearance of a fluidized bed granulation coating apparatus which is Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view of the granulation coating apparatus of FIG. The granulating and coating apparatus 1 shown in FIGS. 1 and 2 is an apparatus that performs granulating coating processing on a granular material by fluidizing the granular material as a raw material in the can body 2 and spraying a coating liquid as appropriate. It is. The can body 2 is formed in a cylindrical shape, and has a form in which a filter casing 3, a spray casing 4, a raw material container 5 and an air supply unit 6 are stacked in order from the top. The filter casing 3 is fixedly supported by the support column 12 via a fixing bracket 11, and the filter casing 3 and the spray casing 4, and the spray casing 4 and the raw material container 5 are fastened in an airtight state by clamps 10a and 10b, respectively. Yes.

  The upper end of the filter casing 3 is closed by a canopy 13, and a filter chamber 14 is formed inside. An exhaust duct 15 is connected to the filter chamber 14, and a cleaning water supply pipe 16 is provided on the side wall. A filter unit 17 for collecting fine particles from the exhaust gas sent to the exhaust duct 15 is accommodated in the filter chamber 14. The filter unit 17 is provided with a plurality of bag filters 18 using a filter medium that is an embodiment of the present invention.

  FIG. 3 is an explanatory diagram showing the configuration of the bug filter 18. As shown in FIG. 3, the bag filter 18 has a bottomed cylindrical shape in which the upper end is closed and the lower end is opened. The lower end portion of each bag filter 18 is integrated with a base portion 19 formed in a disc shape. The base portion 19 is formed with a plurality of filter holes 20 corresponding to the opening portions of the bag filter 18, and the bag filter 18 is attached to each filter hole 20. An annular outer edge portion 21 for fixing the filter unit 17 in the filter casing 3 is provided on the outer peripheral portion of the base portion 19. The outer edge portion 21 is formed in a hollow shape, and a stainless steel metal band 22 is inserted therein.

  On the upper surface portion 18 a (bottom surface portion) of each bag filter 18, a hanging hand-like hanging portion 23 is provided. On the other hand, a hang rail 24 is provided in the filter casing 3. A plurality of hooks 25 are attached to the hang rail 24, and the bag filter 18 is suspended in the filter chamber 14 by hooking a hanging portion 23 on the hook 25. The hang rail 24 is suspended from one end side of a swing arm 26 provided in the filter casing 3. The other end of the swing arm 26 is fixed to a drive shaft 27 that is rotatably attached to the filter casing 3. The drive shaft 27 is connected to an air cylinder 29 via a lever 28. When the air cylinder 29 is operated, the upper end portion of each bag filter 18 moves up and down in the filter casing 3, whereby the bag filter 18 is shaken. The hang rail 24, the hook 25, the swing arm 26, the drive shaft 27, and the lever 28 are formed of stainless steel as a conductive member.

  Here, in the filter unit 17 of the granulation coating apparatus 1, it forms with a different material according to a function. That is, a woven fabric using a fluororesin fiber and other fibers is used for the part functioning as a filtration part in consideration of the releasability and shaking resistance of fine particles, and the part functioning as a fixing part is used. Considering the mounting strength, fibers other than fluororesin fibers are used. For example, a woven fabric using a fluororesin fiber and a static elimination fiber (conductive fiber) is used for the cylindrical side wall part 18b and the base part 19 of the bag filter 18 serving as a fine particle collection part. On the other hand, a woven fabric using polyester fibers and static elimination fibers is used for the upper surface portion 18a of the bag filter 18 provided with the hanging portion 23 and the outer edge portion 21 on the outer periphery of the base portion.

  The fluororesin fiber used in the bag filter 18 and the base part 19 is a fiber in which fluorine atoms are introduced into various polymers. Here, FEP (tetrafluoroethylene / hexafluoropropylene) is used. Copolymer), ETFE (tetrafluoroethylene / ethylene copolymer), PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer) and the like are preferably used.

  The bag filter 18 has a form in which a woven fabric is formed into a bag shape by sewing. In this embodiment, a fluorine-based fiber yarn is also used for the joint 18c (sewing joint). In addition, although various fiber yarns can be used for stitching the joint portion 18c, it is preferable to use a fluorine-based fiber yarn that is excellent in stitchability for a platform for sewing woven fabrics mainly composed of fluororesin fibers. In particular, it is preferable to use PTFE (polytetrafluoroethylene). Further, in order to improve the strength of the joining portion 18c, as shown by a broken line in FIG. 3, the joining portion 18c is reinforced with a polyester fiber band 30 (reinforcing member) or the end portion of the filter medium corresponding to the broken line portion. May be formed of polyester fiber. As a result, the durability of the bag filter 18 is improved, the apparatus can be operated for a long time, and the production efficiency is improved. The joining portion 18c may be bonded with an adhesive, or may be welded by ultrasonic waves or heating.

  The hanging portion 23 and the outer edge portion 21 used for suspending and fixing the filter are formed of a woven fabric using polyester fibers and conductive fibers. As described above, the use of fluororesin fibers as a filter medium has a problem in terms of material strength, and a filter made of fluororesin fibers alone cannot be applied to a granulation coating apparatus. On the other hand, in the bag filter 18 of the granulation coating apparatus 1, fine particles are adhered to the cylindrical side wall portion 18 b by using a filter medium having a new configuration using fluororesin fibers and other fibers (sewing threads). On the other hand, a material using polyester fiber and conductive fiber is adopted for the part where external force is applied, and mechanical strength is secured. That is, the bag filter 18 does not form a filter medium with a single fluororesin fiber, but arranges the material at an appropriate position in order to achieve both the filtering function and mechanical strength of the bag filter. For this reason, it becomes possible to use the fluororesin fiber which could not be used conventionally as a filter medium for a bag filter, and it is possible to suppress adhesion of raw materials to the filter while ensuring strength.

  In this case, as other fibers combined with the fluororesin fiber, any fiber that can be generally used for a filter medium can be used regardless of natural fibers or chemical fibers (artificial fibers). Examples of natural fibers include plant fibers such as cotton, silk and hemp, and animal fibers such as wool. In addition, synthetic fibers include synthetic fibers, regenerated fibers, semi-synthetic fibers, and inorganic fibers. Examples of synthetic fibers include polyester-based synthetic fibers such as polyethylene terephthalate, polyamide-based synthetic fibers, vinylon, polyethylene, and polypropylene. Polyolefin synthetic fibers, fluorocarbon synthetic fibers such as PTFE, and acrylic synthetic fibers such as acrylonitrile copolymers. Furthermore, examples of the regenerated fiber include cellulosic regenerated fibers such as rayon, examples of the semisynthetic fiber include acetate type semisynthetic fiber, and examples of the inorganic fiber include glass fiber and carbon fiber. However, in the present invention, from the viewpoint of reinforcing the fluororesin fiber, it is necessary to use a fiber having a strength higher than that of the fluororesin fiber, and it is preferable to use a polyester fiber from the viewpoint of cost and durability.

  In addition, it is preferable that other fibers combined with the fluororesin fibers are conductive neutralizing fibers in order to suppress the chargeability of the filter medium and improve the peelability and safety of the powder raw material. Examples of such neutralizing fibers include metal yarns such as stainless steel fibers, chemical fibers such as nylon and polyester, and glass fibers coated with conductive ceramics and metals. Incorporated, blended, or surface-treated. In this embodiment, a conductive metal thread is used as the conductive thread, and this conductive thread is woven together with the fluororesin fiber when the filter cloth is woven. Then, the filter is mounted so that the conductive yarn contacts the hook 25 (made of stainless steel) that suspends the bag filter 18.

  As a result, the bag filter 18 is grounded via the can body 2 and the like, and dust explosion and fine particle adhesion due to filter charging can be prevented. In addition, since a flexible resin conductive thread is woven into the fabric, it is not necessary to sew a metal thread during filter sewing, and contamination due to breakage of the metal thread can be prevented. If conductivity can be ensured, it is also possible to use a white conductive thread such as a white carbon material (common name: silver carbon or white carbon) in which glass fiber is vapor-deposited aluminum. The impression of appearance is also improved.

  The use ratio of the fluororesin fiber and other fibers in the woven fabric is not particularly limited, but is generally 10 to 100% by weight of the filter medium used by the fluororesin fiber, preferably 50 to 95% by weight, particularly preferably. 70-95% weight. In addition, the ratio of use may vary depending on the site where the filter medium is used, and fluororesin fibers are often used for the part that mainly performs collection, which is the main function of the collection filter. Many fibers with excellent strength are used. In particular, it is not necessary to use fluororesin fibers for portions that do not participate in the collection, such as the suspended portion 23 of the bag-like collection portion and the outer edge portion 21 for fixing the bag filter 18 to the apparatus.

  The spray casing 4 is attached to a slider 31 provided slidably with respect to the support column 12 via a bracket 32, and is movable up and down. In the spray casing 4, a flow chamber 33 that also serves as a spray chamber is formed, and a spray nozzle 34 for spraying a binder liquid or a coating liquid onto the powder particles in a spray form is disposed. The spray nozzle 34 is attached to a spray arm 35, and a binder liquid and a coating liquid are supplied from a pump provided outside the apparatus through a tube (not shown). The spray arm 35 is also slidably attached to the support column 12, and the spray nozzle 34 can be appropriately moved in the vertical direction within the spray casing 4.

  The raw material container 5 includes a container casing 36 and a countersink plate 37 attached to the lower end of the container casing 36. The container casing 36 is an inverted frustoconical cylinder having a smaller diameter toward the lower side, and a raw material storage chamber 38 is formed therein. The eye plate 37 is formed of a wire mesh or the like, and has a breathable structure. The granular material charged into the raw material storage chamber 38 is supported on the eye plate plate 37.

  An air supply unit 6 having an air supply chamber 39 therein is installed below the raw material container 5. The air supply unit 6 is connected to an air supply duct 41 that communicates with the air supply chamber 39. The air supply duct 41 is connected to an air supply source (not shown) provided outside the apparatus. The air supply unit 6 includes a flange 42 that can move up and down, and a bellows portion 43 that can expand and contract in the vertical direction. A pneumatic cylinder 44 is disposed in the air supply unit 6, and a rod 45 of the pneumatic cylinder 44 is connected to the flange 42 by a plurality of connecting arms 46 extending in the radial direction. The pneumatic cylinder 44 and the rod 45 are shielded from the air supply chamber 39 by a shield 48 having a bellows portion 47.

  In the granulation coating apparatus 1, when the pneumatic cylinder 44 is driven and the flange 42 is lowered while the clamp 10b is removed, the wheels 49 come into contact with the floor surface, and the carriage 51 becomes ready to travel. When the cart 51 is in this state, the raw material container 5 in which the processing of the powder particles has been completed can be carried out, or the raw material container 5 in which the untreated powder particles have been charged can be carried in. On the other hand, in order to make the granulation coating apparatus 1 in a processable state, first, the raw material container 5 is carried between the spray casing 4 and the air supply unit 6, and in this state, the pneumatic cylinder 44 is driven to set the flange 42. Raise. And the raw material container 5 and the spray casing 4 are mutually fastened using the clamp 10b. Thereby, the granulation coating apparatus 1 will be in the state shown in FIG. 1, and will be in the state in which granulation coating processing is possible.

  In such a granulation coating apparatus 1, when flowing air is supplied from the air supply duct 41 to the air supply chamber 39, the air flows into the raw material storage chamber 38 through the eye plate 37. Thereby, the granular material in the raw material storage chamber 38 is blown up, and it will be in a fluid state in the raw material storage chamber 38 or the flow chamber 33. In this state, by spraying a binder liquid or a coating liquid in a spray form from the spray nozzle 34 as appropriate, the coating process of the granular material is executed. Further, after the powder coating process, spraying from the spray nozzle 34 can be stopped to dry the processed product.

  On the other hand, the gas in which the powder particles are in a fluid state is discharged through the exhaust duct 15 after the fine particles are removed and cleaned by the bag filter 18. The fine particles adhering to the bag filter 18 are appropriately shaken. As described above, since the bag filter 18 is formed using a fluororesin fiber, fine powders are easily separated, and the bug is efficiently bugged by shaking. Fine particles are screened off from the filter 18. Further, since the bag filter 18 is composed of a fluororesin fiber and other fibers such as polyester, the mechanical strength is high, and the bag filter 18 is not damaged even if the shaking is performed.

  Thus, in the granulation coating apparatus 1 using the filter medium according to the present invention, the bag filter 18 is formed using the filter medium made of fluororesin fiber and other fibers, so that the filter strength is ensured, A fluororesin fiber excellent in releasability of the powder raw material can be used as a filter material. For this reason, it becomes possible to apply a bag filter using fluororesin fibers to the granulating coating device, extend the usable time of the filter, and minimize maintenance due to clogging of the bag filter. Is possible. Therefore, the productivity of the granulation coating process can be improved, and the manufacturing cost of the product can be reduced.

  Further, by using the fluororesin fiber, the amount of raw material attached to the filter is reduced, and the product recovery rate can be improved. In particular, in the case of granulation coating treatment for drugs using expensive raw materials, effective utilization of the drug substance is an issue, and the cost reduction effect due to the improvement of the product recovery rate is great. Furthermore, use of fluororesin fibers makes it possible to deal with products that use solvents, and it is possible to expand the application of the apparatus. In addition, by using a filter medium in which a fluororesin fiber and a conductive fiber are combined, in addition to extending the usable time, the filter can be neutralized and safety can be improved.

  Next, as Example 2 of the present invention, a case where the filter medium according to the present invention is used in a cartridge filter will be described. In the following examples, the same members and parts as those in Example 1 are described in a simplified manner.

  FIG. 4 is a sectional view of a granulation coating apparatus that is Embodiment 2 of the present invention. The granulation coating apparatus 101 of FIG. 4 also includes a cylindrical can body 102, and is substantially the same as the granulation coating apparatus 1 of FIG. Similar to the granulation coating apparatus 1, the can body 102 has a configuration in which a filter casing 103, a spray casing 104, a raw material container 105 and an air supply unit 106 are sequentially stacked. In the granulation coating apparatus 101, unlike the granulation coating apparatus 1, a top plate 107 is disposed in the filter casing 103, and a cartridge filter 108 is attached to the top plate 107. A spray nozzle 109 is installed in the spray casing 104, and a countersink plate 111 is installed at the bottom of the raw material container 105.

  The upper end of the filter casing 103 is closed by a canopy 112, and a filter chamber 113 is formed inside. An exhaust duct 114 communicating with outside air is connected to the filter chamber 113. A top plate 107 formed in a disk shape is accommodated in the filter chamber 113. The peripheral edge of the top plate 107 is in contact with the inner surface of the filter casing 103, and one end of a wire 115 is attached to the upper surface thereof. The wire 115 is drawn out of the apparatus via pulleys 116a and 116b, and the other end is connected to a pulley (not shown) driven by a motor. With this wire 115, the top plate 107 can move in the vertical direction in the filter casing 103 and the spray casing 104.

  The cartridge filter 108 includes a fine powder collecting unit 117 using the filter medium according to the present invention. FIG. 5 is an explanatory view showing the configuration of the cartridge filter 108. Here, a non-woven fabric using other fibers such as a fluororesin fiber and a polyester fiber is used for the fine powder collecting portion 117. FIG. Other fibers are as described above. For example, metal threads such as stainless steel fibers are used. The fine powder collecting unit 117 has a pleated shape that is alternately folded, and is used by being formed into a cylindrical shape. The fine powder collecting unit 117 is attached to the outside of a cylindrical filter support (not shown) formed of a metal such as stainless steel. The filter support is provided with a large number of ventilation holes on the side surface, and the inside and outside of the support are communicated with each other through the ventilation holes.

  As shown in FIG. 5, ring-shaped end caps 118a and 118b made of stainless steel are attached above and below the fine powder collecting portion 117. A stainless steel retainer 119 is inserted in the center of the cartridge filter 108, and the upper end of the retainer 119 is fixed to the top plate 107. On the other hand, a filter fixing knob 120 is attached to the lower end of the retainer 119. By tightening the filter fixing knob 120, the fine powder collecting unit 117 is fixed to the top plate 107 using the retainer 119 as a guide. A rubber packing 121 is interposed between the end cap 118a and the top plate 107, and airtightness between the top plate 107 and the cartridge filter 108 is ensured.

  The filter casing 103 is further provided with a pulse jet nozzle 122 for ejecting pulse air for backwashing. An opening 123 is formed in the top plate 107 so as to face the center of the fine powder collecting portion 117, and the pulse jet nozzle 122 is disposed above the opening 123. The pulse jet nozzle 122 is connected to a pulse air supply source (not shown) and injects pulse air inside the cartridge filter 108. Thereby, a so-called backwashing process is performed, and the granular material adhering to the fine powder collecting unit 117 is removed. At this time, since the cartridge filter 108 is formed using a fluororesin fiber, fine powder separation is good, and fine powder particles are efficiently screened off from the cartridge filter 108 by this back washing treatment. Further, since the cartridge filter 108 is composed of fluororesin fibers and other fibers such as polyester, it has high mechanical strength, and even if the backwash process is performed, the backwash process is not damaged. .

  A flow chamber 124 is formed inside the spray casing 104. A spray nozzle 109 is disposed in the flow chamber 124, and a binder liquid and a coating liquid are supplied from a pump provided outside the apparatus through a tube (not shown). The spray nozzle 109 is attached to a spray arm 125, and the spray arm 125 is slidably attached to a support (not shown). As a result, the spray nozzle 109 can be appropriately moved in the vertical direction within the spray casing 104.

  The raw material container 105 is an inverted frustoconical cylinder having a smaller diameter toward the lower side, and is attached to the lower end of the spray casing 104 in an airtight state. The raw material container 105 is also attached to a carriage equipped with traveling wheels, similarly to the granulation coating apparatus 1 of FIGS. A raw material storage chamber 126 is formed inside the raw material container 105, and a countersink plate 111 having air permeability is provided below the raw material container 105. The granular material charged into the raw material storage chamber 126 is supported on the eye plate 111.

  An air supply unit 106 having an air supply chamber 127 inside is installed below the raw material container 105. The air supply unit 106 is connected to an air supply duct 128 that communicates with the air supply chamber 127. The air supply duct 128 is connected to an air supply source (not shown) provided outside the apparatus. In addition, an upper portion of the air supply unit 106 is provided with a bellows portion 129 that can expand and contract in the vertical direction and a ring-shaped flange 131 that is attached to the upper end of the bellows portion 129. The flange 131 is coupled to a flange 132 provided at the lower end of the raw material container 105 by a clamp (not shown).

  A pneumatic cylinder 133 is further arranged in the air supply chamber 127. A plurality of connecting arms 135 extending in the radial direction are attached to the tip of the rod 134 of the pneumatic cylinder 133. The outer periphery of the connecting arm 135 is connected to a flange 131, and the flange 131 moves in the vertical direction as the pneumatic cylinder 133 operates. The pneumatic cylinder 133 and the rod 134 are accommodated in a shield 137 having a bellows portion 136. The pneumatic cylinder 133 is arranged so as to be shielded from the air supply chamber 127 by the shield 137.

  Also in the granulation coating apparatus 101, when the pneumatic cylinder 133 is driven and the flange 131 is lowered, the wheels of the raw material container 105 come into contact with the floor surface, and the cart can be driven, and the raw material container 105 can be carried out and carried in. Become. When the raw material container 105 is carried between the spray casing 104 and the air supply unit 106 and the pneumatic cylinder 133 is driven in this state to raise the flange 131, the raw material container 105 is pushed up, and the spray casing 104 and the raw material The container 105 is joined in an airtight state.

  In such a granulating coating apparatus 101, when flowing air is supplied from the air supply duct 128 to the air supply chamber 127, this air flows into the raw material storage chamber 126 through the eye plate 111. As a result, the granular material in the raw material storage chamber 126 is blown up, and is brought into a fluid state in the raw material storage chamber 126 and the flow chamber 124. In this state, by spraying a binder liquid or a coating liquid as appropriate from the spray nozzle 109 in a spray form, the coating process of the granular material is executed.

  On the other hand, the gas in which the powder particles are in a fluid state is discharged through the exhaust duct 114 after the fine particles are removed and cleaned by the cartridge filter 108. The fine particles adhering to the cartridge filter 108 are appropriately backwashed. As described above, the fine particles are efficiently screened off from the cartridge filter 108 by the backwashing. Further, since the mechanical strength of the cartridge filter 108 is high, the cartridge filter 108 is not damaged even if the backwash process is performed.

  Thus, in the granulation coating apparatus 101 using the filter medium according to the present invention, the cartridge filter 108 is formed using the filter medium made of fluororesin fibers and other fibers, so that the filter strength is ensured, A fluororesin fiber excellent in releasability of the powder raw material can be used as a filter material. For this reason, it is possible to apply a cartridge filter using fluororesin fibers to the granulating coating device, extend the usable time of the filter, and minimize maintenance due to clogging of the cartridge filter. Is possible. Therefore, the productivity of the granulation coating process can be improved, and the manufacturing cost of the product can be reduced.

  In addition, as described above, since the amount of raw material attached to the filter is reduced, the product recovery rate is improved, and in particular, the cost reduction effect in the granulating coating process for chemicals is large. Furthermore, it is possible to deal with products that use solvents, and the use of the device can be expanded. In addition, since the filter is also neutralized by the combined use of conductive fibers, work safety is also ensured.

It goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.
For example, the examples of the fluororesin fiber and other fibers in the above-described embodiments are merely examples, and fibers other than those illustrated above can be used for the filter medium of the present invention. Further, the use ratio of the fluororesin fiber and other fibers is not limited to the above-mentioned numerical values. Furthermore, in the above-described embodiment, an example in which the woven fabric using the filter medium of the present invention is used for the bag filter and the same nonwoven fabric is used for the cartridge filter is shown. However, the nonwoven fabric may be used for the bag filter and the woven fabric may be used for the cartridge filter. Is possible. However, in consideration of fuzz due to the shaking process, it is preferable to use a woven cloth for the bag filter.

  In addition, in the bag filter 18 according to the first embodiment, the upper surface portion 18a is formed of polyester fibers and static elimination fibers because the upper surface portion 18a is provided with the suspended portion 23. However, the suspended portion 23 is formed of the upper surface portion 18a. In the case where the upper surface portion 18a is not provided, the upper surface portion 18a may be formed of a combination of fluororesin fibers and other fibers so as to function as a fine particle collecting portion.

It is a front view which shows the external appearance of the fluidized-bed granulation coating apparatus which is Example 1 of this invention. It is sectional drawing of the granulation coating apparatus of FIG. It is explanatory drawing which shows the structure of the bag filter used with the granulation coating apparatus of FIG. It is sectional drawing of the granulation coating apparatus which is Example 2 of this invention. It is explanatory drawing which shows the structure of the cartridge filter used with the granulation coating apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Granulation coating apparatus 2 Can body 3 Filter casing 4 Spray casing 5 Raw material container 6 Air supply unit 10a, 10b Clamp 11 Fixing bracket 12 Support | pillar 13 Canopy 14 Filter chamber 15 Exhaust duct 16 Supply pipe 17 Filter unit 18 Bag filter 18a Upper surface part (Bottom)
18b Cylindrical side wall 18c Joint (sewing joint)
19 Base part 20 Filter hole 21 Outer edge part 22 Metal band 23 Hanging part 24 Hang rail 25 Hook 26 Swing arm 27 Drive shaft 28 Lever 29 Air cylinder 30 Band cloth (reinforcing member)
31 Slider 32 Bracket 33 Flow chamber 34 Spray nozzle 35 Spray arm 36 Container casing 37 Plate plate 38 Raw material storage chamber 39 Air supply chamber 41 Air supply duct 42 Flange 43 Bellows portion 44 Pneumatic cylinder 45 Rod 46 Connection arm 47 Bellows portion 48 Shield 49 Wheel 51 Dolly
101 granulation coating equipment
102 cans
103 Filter casing
104 spray casing
105 Raw material container
106 Air supply unit
107 Top plate
108 Cartridge filter
109 Spray nozzle
111 countersink
112 canopy
113 Filter room
114 Exhaust duct
115 wires
116a, 116b Pulley
117 Fine powder collector
118a, 118b End cap
119 Retainer
120 Filter fixing knob
121 Rubber packing
122 Pulse jet nozzle
123 opening
124 Fluid chamber
125 spray arm
126 Raw material storage chamber
127 Air supply room
128 Air supply duct
129 bellows
131 Flange
132 Flange
133 Pneumatic cylinder
134 Rod
135 articulated arm
136 Bellows
137 Shield

Claims (10)

A bug for collecting fine particles formed in a granulating and coating apparatus and formed using a filter medium made of a woven fabric containing 50 to 95% by weight of the fluororesin fibers using fluororesin fibers and polyester fibers. A filter,
The bag filter is formed in a bottomed cylindrical shape, and has a cylindrical side wall portion that constitutes a collecting portion for filtering the fine particles, and a bottom surface portion provided with a hanging portion capable of hanging the bag filter. ,
A bag filter for collecting fine particles, wherein the cylindrical side wall portion is formed of the filter medium, and the bottom surface portion is formed of a woven fabric made of polyester fibers and conductive neutralizing fibers . In fine particle trapping bag filter of claim 1, wherein the filter medium is fine particle trapping bag filter, characterized in that it comprises a neutralization fibers having conductivity. The bag filter for collecting fine particles according to claim 1 or 2 , wherein the cylindrical side wall portion is formed by sewing the filter medium in a cylindrical shape, and is formed of a polyester woven cloth in the vicinity of the sewing joint portion. A bag filter for collecting fine particles, comprising a reinforcing member . In fine particle trapping bag filter according to claim 3, wherein the bag filter is fine particle trapping bag filter, characterized in that it is sewn in a PTFE sewing thread. In the bag filter for collecting fine particles according to any one of claims 1 to 4 , a reinforcing member formed of a polyester woven fabric is disposed in the vicinity of a joint portion between the cylindrical side wall portion and the bottom surface portion. A bug filter for collecting fine particles. The bag filter for collecting fine particles according to any one of claims 1 to 5, wherein the suspended portion is formed of a woven fabric made of polyester fibers and conductive neutralizing fibers. Bug filter for collecting fine particles. The fine particle collecting bag filter according to any one of claims 1 to 6, wherein the neutralizing fiber is a metal thread . The bag filter for collecting fine particles according to any one of claims 1 to 6 , wherein the static eliminating fiber is a conductive yarn made of resin . The bug filter for collecting fine particles according to claim 1 , wherein the bag filter is joined to a planar base member having an opening connected to an opening of the bag filter,
The base member is formed using a fluororesin fiber and a fiber other than a fluororesin fiber selected from natural fibers or chemical fibers . 10. The fine particle collecting bag filter according to claim 9, wherein an outer edge portion formed using a polyester fiber is provided on an outer peripheral portion of the base member .

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