JP2007224439A - Apparatus for producing inorganic fiber mat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for producing an inorganic fiber mat, which can dispense with a work for cleaning a fiber-collecting conveyer to reduce the loads of the work, and can recover a binder adhered to the fiber-collecting conveyer. <P>SOLUTION: A cleaning device 26 for jetting jet water on the fiber-collecting conveyer 4 to clean the conveyer, and a brush device 27 for rubbing down materials adhered to the fiber-collecting conveyer 4 are disposed in a region behind the delivery of the inorganic fiber mat 8 on the fiber-collecting conveyer 4 to always clean the fiber-collecting conveyer 4 during the travel, and the binder separated from the fiber-collecting conveyer 4 and then dropped into a pit 13 is recovered with a binder-recovering device 15. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an apparatus for producing an inorganic fiber mat such as a glass fiber mat or a rock wool mat.

  2. Description of the Related Art Conventionally, an inorganic fiber mat manufacturing apparatus includes a spinning device that forms and sends inorganic fibers, and an endless cotton collecting conveyor for depositing inorganic fibers from the spinning device in a mat shape. A perforated cotton collecting conveyor provided to circulate, a binder applying device for applying a binder in the form of an aqueous solution to inorganic fibers fed from the spinning device to the cotton collecting conveyor, and adjacent to the cotton collecting conveyor The inorganic fiber mat formed on the cotton collecting conveyor and sent to the next process, a device for curing and drying the binder of the inorganic fiber mat sent by the conveyor, and the cured inorganic material A device for cutting and packing the fiber mat is provided.

In this type of manufacturing apparatus, the inorganic fibers fiberized by the spinning device are given a binder, and then sprayed toward the cotton collecting conveyor and sucked by the negative pressure applied to the cotton collecting conveyor. In many cases, the inorganic fiber mat is deposited in a wet state. The wet inorganic fiber mat formed on the cotton collecting conveyor is sent downstream, where the binder is cured, dried, cut into a predetermined size, packed, and the like. Here, when the inorganic fibers to which the binder has been applied are collected on the cotton collection conveyor, some of the binder and cotton waste are carried on the suction airflow and pass through the cotton collection conveyor and are discharged. In view of this, an apparatus for removing cotton residue from an airflow passing through a cotton collecting conveyor and collecting a binder is proposed in US Pat. No. 4,230,471.
U.S. Pat. No. 4,230,471

  However, in the conventional inorganic fiber mat manufacturing apparatus, measures are taken to remove the cotton residue from the airflow passing through the cotton collecting conveyor and collect the binder, but no measures are taken for the cotton collecting conveyor. . In the cotton collection conveyor, inorganic fibers to which a binder has been applied are deposited, and since the air flow containing the binder aqueous solution passes through the cotton collection conveyor, the binder adheres to the cotton collection conveyor and solidifies. Cotton dust adheres and is captured. For this reason, as the operation continues, solid matter such as cotton residue and binder attached to the cotton collection conveyor grows. If the amount of solid matter adhering to the cotton collection conveyor increases, the perforated structure cotton collection conveyor will become clogged, the efficiency of sucking and depositing inorganic fibers will deteriorate, and the quality of the manufactured inorganic fiber mat Reduce. Therefore, when the amount of solid matter on the cotton collecting conveyor increases, it is necessary to remove the solid matter. For example, once a month, it is necessary to stop the operation of the apparatus and clean the cotton collecting conveyor. However, the solid matter adhering to the cotton collecting conveyor is hardened because the binder is hardened. To remove the solid matter, a troublesome removal work of manually rubbing off is required. For this reason, a large work load is imposed and the removal work takes time, resulting in problems such as deterioration of the productivity of the apparatus. Moreover, although the solid substance scraped off from the cotton collection conveyor originally contains a useful binder, it has to be treated as industrial waste, and there is a problem that the disposal cost increases.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and can greatly reduce or eliminate the cleaning work of the cotton collecting conveyor, reduce the work load and increase the productivity of the apparatus, and the cotton collecting conveyor. It is an object of the present invention to provide an apparatus for producing an inorganic fiber mat that can collect a binder adhered to the surface.

  The invention according to claim 1 of the present invention is a spinning device for forming and feeding inorganic fibers and an endless cotton collecting conveyor for depositing the inorganic fibers from the spinning device in a mat shape, and circulates through a predetermined path. A perforated cotton collecting conveyor provided to travel, a binder applying device for applying a binder in the form of an aqueous solution to inorganic fibers fed from the spinning device to the cotton collecting conveyor, and adjacent to the cotton collecting conveyor In an inorganic fiber mat manufacturing apparatus equipped with a conveyer and the like that is arranged and receives the inorganic fiber mat formed on the cotton collecting conveyor and sends it to the next process, the periodic cleaning operation of the cotton collecting conveyor is greatly reduced. Or in order to make it unnecessary, the inorganic fiber from the spinning device is removed from the position of the cotton collecting conveyor where the inorganic fiber mat is sent to the conveyor. In the region between the position for the product is obtained by a configuration of providing a conveyor cleaning apparatus for cleaning the collecting cotton conveyor traveling.

  The invention according to claim 2 is the above-described invention according to claim 1, wherein the conveyor cleaning device is provided with a cleaning device that sprays cleaning water onto the cotton collecting conveyor to wash away deposits. .

  The invention according to claim 3 is the invention according to claim 2 described above, wherein the cleaning device is provided with an injection nozzle that injects cleaning water at a high pressure toward the cotton collection conveyor.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the conveyor cleaning device includes a brush device that rubs the cotton collection conveyor to scrape off deposits. It is a thing.

  The invention according to claim 5 is the invention according to claim 4, wherein the brush device includes a rotating brush that rotates in contact with the cotton collecting conveyor.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5 described above, and is further collected from a pit formed below the cotton collecting conveyor by falling into the pit. The waste liquid is taken out, and a binder recovery device is provided to obtain a reusable recovery binder aqueous solution.

  The invention according to claim 7 is configured such that, in the invention according to claim 6, the recovered binder aqueous solution recovered by the binder recovery apparatus is used to create the binder aqueous solution used in the binder applying apparatus.

  The apparatus for producing an inorganic fiber mat of the present invention can suppress sticking and growth of a binder and cotton scum to a cotton collecting conveyor by providing a conveyor cleaning device that cleans a running cotton collecting conveyor. The troublesome cleaning work that has been done by stopping the equipment is no longer necessary, or the cleaning cycle can be greatly extended, the work burden can be greatly reduced, the productivity of the equipment can be greatly improved, and disposal Material processing costs can be reduced. Moreover, clogging does not occur in a large number of holes formed in the cotton collecting conveyor, so that the efficiency of collecting the cotton is improved and the power load of the suction fan used for suction is reduced.

  Here, as the above-described conveyor cleaning device, by using a cleaning device that sprays cleaning water on the cotton collecting conveyor to wash away the deposits, the water-soluble binder can be washed out well from the cotton collecting conveyor. Waste can also be washed away. In particular, by using a spray nozzle that sprays cleaning water at a high pressure toward the cotton collecting conveyor as a cleaning device, it is possible to perform jet water cleaning that blows high-speed jet water onto the cotton collecting conveyor, which is strong on the cotton collecting conveyor. The binder and cotton residue adhering to the film can be removed well.

  Moreover, a binder and cotton residue can also be removed from a cotton collection conveyor by using the brush apparatus which rubs a cotton collection conveyor and scrapes off a deposit as a conveyor cleaning apparatus. In particular, by using this brush device in combination with the above-described cleaning device using cleaning water, it is possible to remove the binder and the cotton residue from the cotton collection conveyor very well. Here, as the brush device, it is preferable to use a rotating brush that rotates in contact with the cotton collecting conveyor because a better scraping effect can be obtained.

  Furthermore, from the pit formed below the cotton collecting conveyor, the waste liquid collected by dropping into the pit is taken out, and the solid content is separated and removed to obtain a reusable recovered binder aqueous solution. By providing, the binder removed from the cotton collecting conveyor can be effectively recovered and reused. Further, when the recovered binder aqueous solution prepared by the binder recovery apparatus is used for the preparation of the binder aqueous solution used in the binder applying apparatus, there is an advantage that not only the binder contained in the recovered binder aqueous solution but also water can be reused.

  FIG. 1 is a schematic configuration diagram of an apparatus for producing an inorganic fiber mat according to a preferred embodiment of the present invention. An apparatus for producing an inorganic fiber mat, indicated by reference numeral 1 as a whole, includes a spinning device 2 for forming and feeding inorganic fibers 3, and an endless cotton collection for depositing the inorganic fibers 3 from the spinning device 2 in a mat shape. A perforated cotton collecting conveyor 4 provided so as to circulate along a predetermined route, and a binder for applying a binder in the form of an aqueous solution to inorganic fibers fed from the spinning device 2 to the cotton collecting conveyor 4 An applicator 6 is disposed adjacent to the cotton collecting conveyor 4 and receives the inorganic fiber mat 8 formed on the cotton collecting conveyor 4 and sends it to the next process. A curing device (not shown) for curing and drying the binder of the inorganic fiber mat 8, and a cutting device (not shown) for cutting the formed inorganic fiber mat into a predetermined size; Conveyor cleaning for cleaning the cotton collecting conveyor 4 which is provided in a region between the position where the inorganic fiber mat 8 is sent to the conveyor 9 and the position where the inorganic fiber 3 from the spinning device 2 is deposited. The apparatus 11 and the binder collection | recovery apparatus 15 which collect | recovers a binder from the waste liquid collected by the pit 13 currently formed under the cotton collection conveyor 4 are provided. Hereinafter, each part will be described.

  The spinning device 2 converts a molten raw material such as molten glass or molten slag into a fiber and sends it out onto a cotton collecting conveyor 4. As a fiberizing method in the spinning device 2, a known method such as a blow-off method, a flame method, or a centrifugal method can be used, and the structure of the spinning device 2 may be any method.

  The binder applying device 6 applies a binder for bonding fibers in the inorganic fiber mat 8, and includes a binder aqueous solution adjusting tank 17 for creating a binder aqueous solution having a desired concentration, a binder aqueous solution supply pipe 18, and the like. A spray 19 or the like for spraying and adhering the binder aqueous solution to the inorganic fibers 3 between the spinning device 2 and the cotton collecting conveyor 4, and a stock solution supply pipe 21 for supplying the binder stock solution to the binder aqueous solution adjustment tank 17, A recovered binder aqueous solution supply pipe 22 for supplying the recovered binder aqueous solution recovered by the binder recovery device 15 is connected. Instead of spraying the binder on the inorganic fibers 3 between the spinning device 2 and the cotton collecting conveyor 4, the aqueous solution of the binder is sprayed or applied to the inorganic fibers deposited in a mat shape on the cotton collecting conveyor 4. It is good also as a structure to give.

  The binder applied to the inorganic fiber 3 by the binder applying device 6 is excellent in wettability and adhesion to the inorganic fiber 3 to be used before curing, and excellent in adhesiveness to the inorganic fiber 3 after curing, and its cured product. If it has water resistance, moisture resistance, nonflammability, etc., it will not specifically limit, As a suitable example, the thermosetting resin provided with these characteristics can be mentioned. As the thermosetting resin used for the binder, a phenol resin is preferably used for reasons such as cost, heat resistance, water solubility, and easy handling, and a resol type that is heat-cured is particularly preferable. A resol type modified by adding urea can also be used. As the binder, in addition to the phenol resin, a mixture containing a curing accelerator, a silane coupling agent, a dustproof agent, a colorant, a water repellent, and the like can also be used. Since the resol type cures not only by heat curing but also by acidification, a latent catalyst that generates an acid within the curing temperature range can be used as a curing accelerator. As the latent catalyst, an ammonium salt of a strong acid can be used. For example, when ammonium sulfate is used, ammonia and sulfuric acid are generated by thermal decomposition, so that ammonia volatilizes, and the resol is acidified by the residual sulfuric acid to accelerate curing. As described above, the binder is applied in the form of an aqueous solution. The concentration of the aqueous binder solution used here is about 0.2 to 2.0% by weight.

  The cotton collecting conveyor 4 is not limited to the structure and material as long as it has a perforated structure that has air permeability, has strength to withstand the loading load of inorganic fibers, and has corrosion resistance that does not corrode the aqueous binder solution. A stainless steel wire mesh, wedge wire, screen, punching plate (pan plate), etc. can be used, but a highly rigid pan plate is particularly preferred.

  A pit 13 is formed below the cotton collecting conveyor 4 to collect the binder aqueous solution, cotton waste, etc., which passes through the cotton collecting conveyor 4 and falls, and temporarily collects waste liquid at one end thereof. The waste liquid reservoir 24 is formed. Further, the space on the pit 13 is sucked by a suction fan (not shown), and by this suction, the inorganic fibers 3 from the spinning device 2 are sucked onto the cotton collecting conveyor 4 and accumulated. In addition, an inorganic fiber mat that is wet with a binder can be formed. An apparatus (not shown) for removing foreign substances in the suction airflow and collecting the binder is also provided in the middle of the suction path from the pit.

  The conveyor cleaning device 11 cleans and adheres the running accumulation conveyor 4 in a region between the position where the inorganic fiber mat 8 is sent to the transport conveyor 9 and the position where the inorganic fiber 3 from the spinning device 2 is deposited. The binder and cotton residue that have been removed are removed and discharged to the lower pit 13. The conveyor cleaning device 11 is not limited to a structure as long as it fulfills this function, but in this embodiment, the cleaning device 26 that sprays cleaning water onto the cotton collection conveyor 4 to wash away deposits, and the cotton collection The configuration includes a brush device 27 that scrapes off the deposits by rubbing the conveyor 4.

  The washing device 26 used here is for washing away the binder and cotton dust adhering to the cotton collecting conveyor 4 by a water flow, and is not limited to the structure as long as it can perform its function, It is preferable to use jet water formed by jetting at a high pressure because the removal efficiency is good. In the embodiment of the drawings, a nozzle provided with an injection nozzle 26a that jets cleaning water toward the cotton collecting conveyor 4 at a high pressure is used so that jet water cleaning can be performed. Here, the water pressure applied to the injection nozzle 26a is about 3 to 15 MPa. The larger the water pressure and the amount of washing water are, the higher the removal efficiency is. However, if the water pressure and the amount of washing water are large, the equipment cost and running cost become high. It is preferable that the jetting direction of the jet water formed by the jet nozzle 26a is set so as to be opposed to the traveling direction of the cotton collecting conveyor 4 and at an acute angle with respect to the cotton collecting conveyor 4 because the removal efficiency is high. Furthermore, it is preferable to arrange the spray nozzles on both the front side and the back side of the cotton collecting conveyor 4 because both sides of the cotton collecting conveyor 4 can be cleaned well. Since the binder fixed to the cotton collecting conveyor 4 is mainly removed by dissolving in the jet water jetted, it is advantageous that the temperature of the jet water is higher because the solubility of the binder is higher, but it is too high. Then, the binder is hardened and difficult to remove. For this reason, it is preferable to set it as the temperature which does not accelerate | stimulate hardening of a binder very much. Considering these, the temperature of the jet water is preferably about 40 to 70 ° C. The number of nozzles 26a used and the installation position are not particularly limited, but are preferably provided at two locations so that jet water can be sprayed onto the front and back surfaces of the cotton collecting conveyor 4, respectively.

  Although most of the binder and cotton dust can be removed from the cotton collection conveyor 4 by jet water cleaning, the binder that is highly viscous and firmly fixed to the cotton collection conveyor 4 may not be removed by jet water cleaning alone. In view of this, the brush device 27 is provided to physically scrape off the binder and cotton dust adhered from the cotton collecting conveyor 4. The structure of the brush device 27 is not limited as long as it can remove the fixed binder and cotton dust without damaging the cotton collecting conveyor 4, but it is preferable to use a rotating brush because of its high removal efficiency. In the illustrated embodiment, the rotating brushes 27a are arranged at two locations. As the rotating brush 27a, a spiral roll brush formed by spirally winding a brush wire on the roll surface is easy to manufacture and can be obtained at low cost, and is in uniform contact with the surface of the cotton collection conveyor 4 It is preferable because it is possible. The material of the brush wire is preferably made of a plastic such as nylon, polypropylene, vinyl chloride, polyester, butylene, or acrylic having an appropriate waist strength without damaging the cotton collecting conveyor 4. If the length of the brush wire passes through the hole of the cotton collecting conveyor 4 and comes out to the back surface, it is convenient to scrape off the fixed matter fixed to the inner surface of the hole, but the length coming out to the back surface is too long. Since the tip of the brush wire is broken, 10 mm or less is preferable. The rotating direction of the rotating brush 27a may be forward or reverse with respect to the traveling direction of the cotton collecting conveyor 4, but the shear friction generated at the contact surface between the rotating brush 27a and the cotton collecting conveyor 4 is large in reverse rotating. Reverse forward rotation is preferable. The binder scraped off by the rotating brush 27 a falls into the pit 13, flows down into the waste liquid reservoir 24, and dissolves in the waste liquid in the waste liquid reservoir 24. In addition, in order to remove the solid substance adhering to the rotating brush 27a, it is good also as a structure which injects washing water to the rotating brush 27a.

  The binder recovery device 15 separates and removes a pump 31 and a pipe 32 that take out the waste liquid stored in the waste liquid reservoir 24 and a relatively large (eg, 1 mm or more) solid matter such as cotton waste in the waste liquid. An apparatus 33, a pipe 34 for sending out the separated liquid after the solid content is removed by the solid-liquid separator 33, a separation liquid tank 35 for storing the separated liquid, a pump 37 and a pipe 38 for taking out the separated liquid from the separated liquid tank 35, A filtration device 39 that removes small solids such as pigment remaining in the separated liquid by filtration, and forms a clean binder aqueous solution (referred to as a recovery binder aqueous solution); a pipe 41 that sends out the recovery binder aqueous solution from the filtration device 39; The recovered binder aqueous solution tank 42 for storing the recovered binder aqueous solution, and the recovered binder aqueous solution from the recovered binder aqueous solution tank 42 And a pump 43 and recovered binder solution supply pipe 22 or the like for feeding the liquid adjustment tank 17. Here, as the solid-liquid separation device 33, a screen type, a pressure dehydrator (filter press), a centrifugal dehydrator, a belt press, a screw press type, a vacuum separator, a rotary drum type, and the like can be used. A screen type that does not require large power is preferable. Examples of the screen type include an inclined type, a rotary type, a bar screen, and a cylindrical screen. A bar screen that naturally separates by its own weight and does not hinder the circulation flow is preferable. The filtration device 39 can be a rotary drum type, a floating filter type, a fiber filter type, etc., but is a fiber filter type that has a high filtration rate and a solid trapping amount per unit filter medium volume, and a small total loss head due to filtration. Is preferred. For the pumps 31, 37, and 43, a water pump such as a spiral pump, a mixed flow pump, or an axial flow pump is used.

  The curing device (not shown) and the cutting device (not shown) provided on the downstream side of the transport conveyor 9 may be conventional ones as they are, and will not be described.

  Next, the operation of the inorganic fiber mat manufacturing apparatus having the above configuration will be described. A binder aqueous solution is sprayed from the binder application device 6 to the inorganic fibers 3 that have been fiberized by the spinning device 2 and sent out, and the binder is applied. The inorganic fibers 3 to which the binder is attached are sucked continuously onto the running cotton collecting conveyor 4 and accumulated in a mat shape to form an inorganic fiber mat 8 in a state of being wet with the binder. Thereafter, the inorganic fiber mat 8 is sent downstream by the conveyor 9, the binder is cured and dried, formed into an inorganic fiber mat, and then cut into a predetermined size and discharged.

  In the above-described manufacturing process of the inorganic fiber mat, most of the binder is adhered to the inorganic fiber and carried away from the binder aqueous solution blown to the inorganic fiber 3 from the binder applicator 6, but some of the binder is water. At the same time, it passes through the inorganic fiber mat 8 and the cotton collecting conveyor 4 and falls into the pit 13. At this time, a part of the binder adheres to the cotton collecting conveyor 4. Also, cotton dust adheres to the cotton collecting conveyor 4. However, since the rotating brush 27a is in contact with the cotton collecting conveyor 4 while rotating, the rotating brush 27a scrapes off the binder and cotton dust adhering to the cotton collecting conveyor 4. Further, since the jet nozzle 26 a jets jet water onto the cotton collecting conveyor 4, the jet water ishes away the binder and cotton residue adhering to the cotton collecting conveyor 4. Thus, after the cotton collection conveyor 4 sends out the inorganic fiber mat 8 formed thereon, the binder and cotton residue adhering to it are removed before returning to the position where new inorganic fibers are deposited. For this reason, the binder and cotton dust do not adhere and grow. Accordingly, it is possible to continuously operate the cotton collecting conveyor 4 without any trouble for a long period of time, and the machine is stopped in a short period of time as in the prior art, and the fixed matter fixed to the cotton collecting conveyor 4 is manually removed. Work becomes unnecessary. Furthermore, since the sticking matter adheres to the cotton collection conveyor 4 and does not grow, the numerous holes formed in the cotton collection conveyor 4 are not clogged, and therefore, the efficiency of the cotton collection suction is improved. The power load of the suction fan is also reduced.

  On the other hand, in the pit 13 provided below the cotton collecting conveyor 4, a part of the binder aqueous solution sprayed from the binder applying device 6 passes through the cotton collecting conveyor 4 and falls. Further, jet water that has been blown onto the cotton collecting conveyor 4 and dissolved by the binder, scraped off by the rotating brush 27 a, and cotton dust are also dropped into the pit 13. The waste liquid containing these binders and cotton dust is collected in the waste liquid reservoir 24 and stays there for an appropriate time. During this time, the solid binder scraped off from the cotton collecting conveyor 4 is also dissolved in the waste liquid. The waste liquid in the waste liquid reservoir 24 is sent to the solid-liquid separator 33 by the pump 31, and relatively large solids such as cotton dust in the waste liquid are separated and removed. The separation liquid after the solid content is removed by the solid-liquid separation apparatus 33 is temporarily stored in the separation liquid tank 35 and then sent to the filtration apparatus 39 by the pump 37 to remove small solids such as contained pigments. Is done. The waste liquid that has been cleaned by removing the solid matter is considerably lower in binder concentration than the aqueous binder solution sprayed onto the inorganic fibers 3 by the binder applying device 6, but is an aqueous solution containing a binder. The collected binder aqueous solution tank 42 is stored. The collected recovered aqueous binder solution is then sent out to the binder aqueous solution adjustment tank 17 by the pump 43 and used as the diluted water of the binder stock solution. Thus, out of the binder aqueous solution sprayed onto the inorganic fibers, the binder dropped into the pit 13 without adhering to the inorganic fibers, or once adhering to the cotton collecting conveyor 4, and then removed by the jet water or the rotating brush 27a. Most of the binder that has fallen into is recovered in the recovered binder aqueous solution and reused. For this reason, conventionally, the cotton collection conveyor 4 can be manually cleaned to recover most of the binder contained in the solids that were thrown away as industrial waste, thereby reducing industrial waste processing costs. In addition, the amount of binder stock solution used can be reduced, and the binder basic unit can be improved.

Glass wool mats were manufactured using an inorganic fiber mat manufacturing apparatus having the configuration shown in FIG. The specifications of the manufacturing equipment are as follows.
-Spinning device 2: Centrifugal method-Binder applying device 6: Nozzle blowing method-Cotton collecting conveyor 4: Stainless steel pan plate (SUS304, thickness 3 mm, width 1600 mm, hole area ratio 40%) having a long hole shape Connected to the drive chain to form a caterpillar.
Cleaning device 26: Method of jetting jet water from the jet nozzle 26a Use jet nozzle 26a:
Made by Ikeuchi Co., Ltd., “¼VV8010S303” (jet angle 80 degrees)
7 in the pan plate width direction (nozzle distance 250mm)
150mm distance between spray nozzle 26a and pan plate
Use pump: Plunger pump "RV-709V" made by Ariko
Pump operating conditions: Discharge rate 16.4 liters / minute, pressure 8.8 MPa
Jet water temperature: 50 ° C
-Brush device 27: Rotating brush method Rotating brush 27a used:
A spiral roll brush in which a polypropylene brush wire (wire diameter: 1 mm, length: 65 mm) was held in a steel hollow pipe having a diameter of 120 mm was used. The tip was installed so that it protruded about 5 mm from the hole of the pan plate to the back side. The rotational speed of the rotary brush 27a is used at 100 rpm.
-Collection device 15:
Solid-liquid separator 33: inclined fine screen
Toyo Screen Industry Co., Ltd. Ultrascreen S1800 type (slit width 0.4mm)
Filtration device 39: Polyester fiber nonwoven fabric type cartridge filter manufactured by Toyobo Co., Ltd. (weight per unit: 260 g / m ² , Thickness 0.70 mm).
Pumps 31, 37, 43: Spiral pump "QUAFS-255-2MW1.5" manufactured by Kawamoto Seisakusho
Pump discharge rate: 60 l / min

A glass wool mat was produced under the following conditions using the production apparatus having the above specifications.
A recovered binder aqueous solution is added as dilution water to a 40% resole resin binder stock solution to form a 0.4% binder aqueous solution, and this is melted pledget-like glass spun from the spinning device 2 by the binder application device 6. The glass fiber mat sprayed onto the fibers and sucked and collected on the upper surface of the running cotton collecting conveyor 4 to form the wet glass fiber mat, and the glass fiber mat is downstream by the conveyor 9 The binder was cured and dried, and then the glass fiber mat was cut into a predetermined size to produce a glass wool mat.

  On the other hand, in the cotton collecting conveyor 4, in parallel with the cotton collecting operation on the upper surface of the cotton collecting conveyor 4, jet water is sprayed on each of the front and back surfaces of the cotton collecting conveyor 4 to clean the two, The rotating brush 27a was brought into contact with to remove the deposits. The aqueous binder solution that passed through the cotton collecting conveyor 4, the jet water after washing the cotton collecting conveyor, the solid matter scraped off by the rotating brush 27a, etc. were collected in the pit 13 and stored in the waste liquid reservoir 24. The waste liquid stored in the waste liquid reservoir 24 is passed through a solid-liquid separator 33 to remove a large solid content, then passed through a filtration device 39 to remove a small solid content, and is stored in a recovered binder aqueous solution tank 42 as a recovered binder aqueous solution. Then, it sent to the binder aqueous solution adjustment tank 17 and reused as dilution water of a binder stock solution. When the binder concentration of the recovered binder aqueous solution in the recovered binder aqueous solution tank 42 was measured, it was about 0.12%.

  After the above production was continued for 6 months, the machine was stopped and the cotton collecting conveyor 4 was inspected. The cotton collecting conveyor 4 showed almost no cotton residue or resin residue (that is, a binder adhered). It was. Therefore, it was possible to operate for a longer period without any trouble.

  As a comparative example, when a glass fiber mat was manufactured under the same conditions as described above without cleaning with jet water and without scraping with a rotating brush, it adhered to the cotton collection conveyor 4 in about one month. As a result, the amount of solid matter increased, and the possibility of poor suction occurred. Then, when the cleaning operation | work which stops the machine and removes the solid substance adhering to the cotton collection conveyor 4 was performed, about 2 hours were required by two workers. In addition, the solid matter removed by this cleaning operation was about 600 kg, which was treated as industrial waste. Since about 80% of the solid matter is the amount of the binder, a considerable amount of the binder is discarded.

  As is clear from the above examples and comparative examples, in the examples, the configuration is such that the running cotton collecting conveyor 4 is always cleaned, so that it is possible to suppress the adhesion of solid matter over a long period of time. Continuous operation was possible and productivity could be improved. Moreover, since the manual cleaning work performed by stopping the cotton collecting conveyor 4 is not required, the work load can be greatly reduced. The solid matter removed by the solid-liquid separation device 33 and the filtration device 39 needs to be treated as industrial waste, and the amount of the fixed matter is larger in the example than in the comparative example, but the increased amount. Is much smaller than the amount of solids removed from the cotton collecting conveyor 4 in the comparative example, and therefore, the amount of waste can be greatly reduced, and industrial waste processing costs can be reduced. Furthermore, in the example, since the binder adhering to the cotton collecting conveyor was collected, the amount of binder used could be reduced, and the binder consumption could be reduced by about 10% compared to the comparative example.

  The preferred embodiments and examples of the present invention have been described above, but the present invention is not limited to these embodiments and examples, and can be appropriately changed within the scope of the claims. Needless to say.

The schematic block diagram which shows the manufacturing apparatus of the inorganic fiber mat which concerns on suitable embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Manufacturing apparatus of inorganic fiber mat 2 Spinning apparatus 3 Inorganic fiber 4 Cotton collecting conveyor 6 Binder application apparatus 8 Inorganic fiber mat 9 Conveyor 11 Conveyor cleaning apparatus 13 Pit 15 Binder collection apparatus 17 Binder aqueous solution adjustment tank 18 Binder aqueous solution supply pipe 19 Spray 21 Stock solution supply pipe 22 Recovery binder aqueous solution supply pipe 24 Waste liquid reservoir 26 Cleaning device 26a Injection nozzle 27 Brush device 27a Rotating brush 31, 37, 43 Pump 32, 34, 38, 41 Piping 33 Solid-liquid separation device 35 Separation liquid tank 39 Filtration Equipment 42 Recovery binder aqueous solution tank

Claims (7)

  A spinning device for forming and feeding inorganic fibers, and an endless cotton collecting conveyor for depositing the inorganic fibers from the spinning device in a mat shape, and provided with a perforation provided to circulate in a predetermined path A cotton collecting conveyor having a structure, a binder applying device for applying a binder in the form of an aqueous solution to inorganic fibers fed from the spinning device to the cotton collecting conveyor, and disposed adjacent to the cotton collecting conveyor, on the cotton collecting conveyor A region between a conveyor that receives the formed inorganic fiber mat and sends it to the next process, and a position of the cotton collecting conveyor that deposits the inorganic fiber from the spinning device from the position where the inorganic fiber mat is sent to the conveyor. The manufacturing apparatus of the inorganic fiber mat which has a conveyor cleaning apparatus which cleans the said cotton collection conveyor in driving | running | working.   The said conveyor cleaning apparatus is equipped with the washing | cleaning apparatus which sprays washing water on the said cotton collection conveyor, and wash | cleans a deposit, The manufacturing apparatus of the inorganic fiber mat of Claim 1 characterized by the above-mentioned.   The said washing | cleaning apparatus is equipped with the injection nozzle which injects washing water toward the said cotton collection conveyor with a high voltage | pressure, The manufacturing apparatus of the inorganic fiber mat of Claim 2 characterized by the above-mentioned.   The said conveyor cleaning apparatus is equipped with the brush apparatus which scrapes off the deposit | attachment by rubbing the said cotton collection conveyor, The manufacturing apparatus of the inorganic fiber mat of any one of Claim 1 to 3 characterized by the above-mentioned.   5. The apparatus for producing an inorganic fiber mat according to claim 4, wherein the brush device includes a rotating brush that rotates in contact with the cotton collecting conveyor.   Further, from the pit formed below the cotton collection conveyor, the waste liquid collected by dropping into the pit is taken out, and the solid content is separated and removed to obtain a binder aqueous solution that can be reused. The apparatus for producing an inorganic fiber mat according to any one of claims 1 to 5, further comprising an apparatus. 7. The apparatus for producing an inorganic fiber mat according to claim 6, wherein the recovered aqueous binder solution recovered by the binder recovery device is used to create an aqueous binder solution used in the binder applying device.

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