JP2005297245A - Drier for plasterboard - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus capable of uniformly drying a plasterboard. <P>SOLUTION: A raw material 2 for a board being a continuous body is passed through a drier on the midway for carrying it by a conveyor. In the first zone 10 of a high temperature and a high humidity zone D1 of the drier, blow boxes 16 for blowing dry air to a board raw material are arranged up and down along the carrying direction of the board raw material and placing the conveyor between them. Each blow box 16 is divided into a plurality of rooms 16A-16C in the width direction, and an amount of the feeding of the dry air to each room is adjusted so that the amount of air is small to both ends, and the amount of air is large at the central part by adjusting a damper 49 to these rooms, and the board raw material is uniformly dried. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a gypsum board dryer.

  Conventionally, a gypsum board manufacturing apparatus as shown in Patent Document 1 has been used.

This manufacturing apparatus first passes through a step of preparing a slurry by mixing raw materials such as gypsum and water (preparation step), and one of the board base papers constituting the front and back surfaces of the gypsum board is prepared. After placing the slurry on the lower side and pouring the slurry thereon, the other board base paper is laminated and pasted from above (bonding process). And after passing through the process (cutting process) cut | disconnected to predetermined length, the gypsum board is manufactured by passing through the process (drying process) which dries the water | moisture content of a board.
JP-A-5-169413 (FIG. 1)

  However, there were still points to be improved in the above. First, it is mentioned that the board is not uniformly dried in the drying process. That is, it is pointed out that the board progresses to dry quickly at the end portion in the width direction, whereas the drying is slow at the center portion in the width direction and causes uneven drying as a whole.

  In addition, the following points are also pointed out. Conventionally, since the board passes through the drying process with a sufficiently high temperature, heat removal is large. Further, since the high-temperature steam evaporated during the drying process was exhausted without being fully utilized, the conventional one combined with the above had low thermal efficiency.

  This invention is completed based on the above situations, Comprising: It aims at providing the apparatus which can dry a gypsum board uniformly.

  As means for achieving the above-mentioned object, the invention of claim 1 is characterized in that a conveyor for conveying a board raw material formed by pouring a slurry raw material between board base papers, and the board raw material for a long time. A dryer for drying the board raw material by passing it in a continuous manner in the vertical direction, and a cutter arranged on the downstream side of the dryer and cutting the board raw material into a desired length dimension. A drying device for a gypsum board, wherein the dryer is provided with a drying air supply means for supplying drying air over almost the entire width of the board raw material being conveyed by the conveying conveyor. The supply means is characterized in that it supplies a dry air with a large air volume to the central portion in the width direction of the board raw material and with a small air volume at both ends in the width direction.

  According to a second aspect of the present invention, in the dryer according to the first aspect, the dryer has a width across the entire width of the board raw material facing the board raw material on the way of conveyance by the conveyor. A blow box connected to the drying air supply source is arranged, and the inside of the blow box is partitioned into a plurality of chambers along the width direction, and a drying air supply duct is individually connected to each chamber. Further, each duct is provided with a dry air volume adjusting means.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the dryer includes a high-temperature and high-humidity zone disposed on the upstream side and a low-temperature and low-humidity zone disposed on the downstream side. The zone has a low-humidity duct that takes in outside air and performs heat exchange between the outside air and the exhaust heat from the high-temperature and high-humidity zone, and then blows low-humidity air to the board raw material that passes through the low-temperature and low-humidity zone. It is characterized by being provided.

  According to a fourth aspect of the present invention, there is provided a reflux tube according to the third aspect, wherein the air in the low temperature and low humidity zone is circulated to the high temperature and high humidity zone side between the high temperature and high humidity zone and the low temperature and low humidity zone. It is characterized by being connected.

<Invention of Claim 1>
According to the first aspect of the present invention, the board raw material formed by pouring the slurry raw material between the board base papers is carried into the dryer in a state of being continuous in the length direction. At this time, in the conventional board raw material, the side edge in the width direction has a faster evaporation of moisture than the central portion, and thus drying unevenness has occurred. Since the supply means supplies the dry air with a larger air volume at the center than at the side end, it is possible to make the evaporation of moisture from the board raw material uniform, thereby eliminating uneven drying. .

<Invention of Claim 2>
According to the second aspect of the present invention, the dry air is introduced into each chamber in the blow box, but the air volume to be supplied to each chamber can be easily adjusted by the air volume adjusting means.

<Invention of Claim 3>
According to the invention of claim 3, in the low-temperature and low-humidity zone, outside air having a lower humidity than the inside of the dryer is taken in, and after this is exchanged with the exhaust heat from the high-temperature and high-humidity zone, it is sprayed on the board raw material. It is done. Since the board raw material is cooled by blowing low-humidity air, heat removal when the board raw material passes through the dryer can be reduced.

<Invention of Claim 4>
According to the invention of claim 4, since the air in the low temperature and low humidity zone can be supplied to the high temperature and high humidity zone through the reflux pipe, that is, to obtain the amount of heat necessary for heating in the high temperature and high humidity zone, Since the heat recovered in the zone is also used, the heat efficiency is excellent.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

<Overview of the whole>
FIG. 1 shows an outline of a production line for gypsum board in the present embodiment. In this line, the conveyor 1 is linearly arranged over the entire length, and the board raw material 2 can be transferred at a constant speed. As shown in FIG. 5, the conveyor 1 is laid on the machine base 3, and in this example, a roller conveyor driven by a driving source (not shown) is used. In this conveyor 1, a pair of roller support frames 4 are arranged along the length direction on both left and right edges of the machine base 3, and a large number of rollers 4 </ b> A are rotatably laid horizontally between them. .

  In the following description, the term “upstream side” or “downstream side” is used in accordance with the transfer direction of the board raw material 2.

  As shown in FIG. 1, a first roll 5 of board base paper is disposed at the upstream end of the conveyor 1. A board base paper to be attached to the surface side of the gypsum board is wound around the first roll 5, and the board base paper can be continuously fed onto the conveyor 1 at a predetermined speed. Further, a mixer 6 is disposed on the downstream side from this. The mixer 6 is for mixing calcined gypsum obtained by subjecting raw material gypsum through a predetermined treatment, water, additives, other admixtures, etc., to form a slurry and to flow on the board base paper. In this case, it is necessary to prevent the slurry raw material from flowing down from the board base paper. Although not shown in detail, before the slurry raw material is flowed from the mixer 6, the thickness of the board base paper is approximately equal to two on one side of the front side board base paper. A half notch is cut along the length direction by the cutter, and then the board base paper is folded along the notch in the process of passing through the squeezing means that narrows the width of the board base paper at the position corresponding to each notch. After the bending, the board base paper is corrected to a substantially C shape that opens upward. Thus, the slurry raw material flowed on the front side board base paper does not flow sideways.

  Further, on the downstream side, a roller 7 is rotatably disposed above the conveyor 1. The roller 7 overlaps the board base paper for the back surface of the gypsum board wound around the second roll 8 with the above-mentioned slurry raw material having a uniform thickness so as to face the board base paper for the front surface. It is wrapped with the board base paper from one roll 5. In this way, it becomes the board raw material 2 which is a continuous molded body, and is transferred as it is for a predetermined stroke reaching the dryer D. During this time, the slurry raw material is a process necessary for the reaction for hydration and curing.

  The board raw material 2 is dried and solidified by a dryer D, which will be described in detail below, and then cut into predetermined dimensions by the cutter unit 9 and taken out at the end of the conveyor 1.

<Dryer D>
Now, the dryer D according to this embodiment will be described in detail below.

  The dryer D is formed in a substantially tunnel shape surrounding the conveyor 1 from the left, right, upper and lower sides, and the inside can pass through the board raw material 2. Further, as shown in FIG. 2, the dryer D is composed of a high-temperature and high-humidity zone D1 and a low-temperature and low-humidity zone D2, and in this embodiment, the high-temperature and high-humidity zone D1 is further divided into first to third zones 10, 20 and 30. In any zone, a heat insulating material (for example, rock wool) is accommodated in each wall W of the dryer D.

  A blower port 11 is opened at the entrance of the dryer D on the ceiling surface of the first zone 10 (see FIGS. 2 to 5). This blower port 11 is connected to a reflux pipe P for circulating the hot air in the low temperature and low humidity zone D2, and a seal provided at the entrance of the first zone 10 by a blower B arranged in the middle of the reflux pipe P. By blowing low-humidity hot air derived from the low-temperature low-humidity zone D2 into the section, outside air (cold air) is prevented from entering from the first zone 10 entrance. This is because if the entry of such cold air is allowed, the equipment near the entrance will be condensed, and the condensed water will drip and the board raw material will be stained.

  A first circulation fan 12 for circulating the drying heat in the first zone 10 is disposed outside the first zone 10 and closer to the inlet. The first circulation fan 12 is connected to a pipe 12U that is piped around the bottom wall W of the dryer D, and can suck the upstream air in the first zone 10 (see FIG. 5). Moreover, the 1st circulation fan 12 is connected to the 1st ventilation duct 13 distribute | arranged along the length direction to the outer surface of the ceiling wall W of the dryer D (refer FIG.3, 4). The first air duct 13 extends to the rear end of the first zone 10, and a first burner 14 (gas burner) is incorporated near the rear end. Further, the first air duct 13 communicates with a first blower portion 15 disposed over a predetermined length range at a rear end portion in the first zone 10. As a result, the hot air heated by the first burner 14 is sent into the first blower section 15 by the first circulation fan 12, then proceeds upstream in the first zone 10, and again by the first circulation fan 12. The air is sucked and circulated to the first air duct 13.

  In this embodiment, a branch pipe T from the circulation pipe P is connected to the primary air intake side of the first burner 14. In addition, another branch pipe from the circulation pipe P is also connected between the first circulation fan 12 and the first burner 14 in the first air duct 13 (not shown), and as a result, the low temperature and low humidity zone Effective use of the heat in D2 is achieved, and the thermal efficiency of the dryer D as a whole is improved.

  Next, the structure of the first blower unit 15 will be described. The first blower unit 15 is arranged near the rear end of the first zone 10, and in this embodiment, the board raw material is sandwiched between the conveyors up and down. It is constituted by a total of four pairs of blow boxes 16 arranged along two transfer directions. Each blow box 16 is arranged in a state of being close to the board raw material 2 at an approximately equal distance from the vertical direction, and is formed in a hollow thin box shape having substantially the same width as the board raw material 2.

  Of the four blow boxes 16 provided at the top and bottom, each blow box 16 disposed on the upper side is directly connected to the first air duct 13 by five pipes 16U, but is disposed on the lower side. Further, each blow box 16 is provided with two collective ducts 17 as a group adjacent to each other in the front and rear, and the first air duct 13 is once connected to both collective ducts 17 and after passing through here, each blow box 16 and The pipes 16U are connected to each other by five pipes. Moreover, a damper 49 for adjusting the air volume is interposed in any pipe 16U, and the air volume can be adjusted by adjusting the opening degree.

  On the other hand, four partition walls are provided in each blow box 16 along the length direction, whereby each blow box 16 is partitioned into five chambers in the width direction. That is, each blow box 16 has a wide central chamber 16A, two intermediate chambers 16B disposed on both sides thereof and approximately half the width of the central chamber, and further disposed on both sides thereof and substantially the same as the intermediate chamber 16B. The chamber is divided into an end chamber 16C having a width, and the above-described pipe 16U is connected to each of the chambers 16A to 16C. In the present embodiment, these pipes are arranged in the order of front and rear in the order of the central chamber, the intermediate chamber, and the end chamber.

  As described above, the dampers 49 for adjusting the air volume are connected to the pipes 16U. However, the opening degree of each of the dampers 49 is changed for each of the chambers 16A to 16C as connection destinations. Specifically, the opening corresponding to the end chamber 16C is throttled so that the amount of air supplied to the end chamber 16C is small. Conversely, the damper 49 corresponding to the central chamber 16A has a large opening, so that the amount of air supplied to the central chamber 16A is large, and the damper 49 corresponding to the intermediate 16B chamber can obtain an intermediate amount of air. The degree of opening is adjusted to the extent.

  Further, in each blow box 16, a large number of jet ports 50 are open over the entire surface facing the board raw material 2, and are distributed almost uniformly, from which dry air is supplied to the board raw material. Are sprayed at right angles to the front and back surfaces (see FIG. 7).

  By the way, in the present embodiment, the temperature in the first zone 10 excluding the first blower unit 15 is about 150 to 170 ° C., but is set to about 280 to 300 ° C. in the first blower unit 15. That is, the 1st blower part 15 plays the role which accelerates the movement of the moisture inside a board by heating the board raw material 2 rapidly.

  Next, the second zone 20 will be described. Also in the second zone 20, the second air duct 23 is provided along the outer surface of the ceiling wall W of the dryer D as in the first zone 10. However, contrary to the first zone 10, the second circulation fan 21 is disposed on the downstream side, and the second burner 22 is disposed on the upstream side. The upstream end of the second air duct 23 is connected to a branched portion from the downstream end of the first air duct 13 and is branched and connected to the ceiling wall W and the bottom wall W of the second zone 20 via a pipe. ing. In this way, a part of the hot air supplied to the first blower unit 15 is taken into the entrance portion of the second zone 20 so as not to cause a rapid temperature drop in the board raw material 2 that has passed through the first blower unit 15. In addition, effective use of heat in the first zone 10 is achieved.

  Moreover, the point where the branch pipe from the reflux pipe P is connected with respect to the 2nd burner 22 and the 2nd ventilation duct 23 is the same as that of the 1st zone 10. FIG.

  In the second zone 20, unlike the first zone 10, the first blower unit 15 is not provided, and the board raw material 2 is no longer rapidly heated. The temperature on the inlet side is about 280 to 300 ° C., but gradually decreases toward the downstream side, and is about 150 to 170 ° C. at the downstream end of the second zone.

  The third zone 30 is also provided with a third air duct 33 on an extension line of the first and second air ducts 13 and 23, and the third burner 32 and the third circulation fan 31 are the same as those in the second zone 20. It is provided by arrangement. The point where the primary air of the third burner 32 is supplied from the reflux pipe P is also the same as in the second zone 20, but the connection between the reflux pipe P and the third air duct 33 is not made in other places, Instead, a branch pipe 25 is connected to the second air duct 23. A distribution fan 26 that distributes the hot air in the second zone 20 to the third zone 30 is incorporated in the middle of the branch pipe 25, and the hot air from the downstream portion of the second zone 20 is in the middle of the third air duct 33. It is supposed to flow into. In the third zone 30, the inlet temperature is about 150 to 170 ° C., but gradually decreases toward the downstream side, and is about 120 ° C. at the downstream end.

  Furthermore, one end of an exhaust pipe 35 having an exhaust fan 36 is connected to the third air duct 33 near the third circulation fan 31. The other end of the exhaust pipe 35 is open to the outside air, and a heat exchanger 45 described later is interposed in the middle.

  The heat exchanger 45 is for supplying hot air into the low temperature and low humidity zone D2 using the heat of the exhaust pipe 35, and is disposed along the ceiling wall of the dryer D in the low temperature and low humidity zone D2. Further, in the present embodiment, the heat exchanger 45 is configured by a total of five heat exchange units 46 arranged in series at regular intervals. In each heat exchanging portion 46, the exhaust pipe 35 is branched into a large number of thin tubes 47, and these thin tubes 47 are accommodated in the thin tube accommodating portion 47H. In each heat exchange section 46, heat exchange chambers 46A and 46B are provided in communication with each other on both sides in the width direction of the thin tube housing section 47H. In FIG. 15, the right side is the primary side heat exchange chamber 46A into which the air in the low temperature and low humidity zone D2 enters, and the left side is the secondary side heat exchange chamber 46B that returns to the low temperature and low humidity zone D2 again after heat exchange. Yes.

  On the other hand, the second blower section 41 is disposed in the low temperature and low humidity zone D2 over almost the entire area. The second blower portion 41 is composed of a plurality of blower plates 43. These blower plates 43 are formed in a hollow thin box shape, and are installed on the top and bottom of the conveyor and along the width direction of the conveyor, And it is provided in parallel for every fixed pitch along the transfer direction of the board | substrate raw material 2. As shown in FIG. The blower plates 43 face each other so that the gaps between the blower plates 43 and the board raw material 2 are substantially equal, and a large number of outlets (not shown) for blowing dry air to the board raw material 2 on these facing surfaces. Is open. In the blower plate 43 of the present embodiment, although not shown, the outlets are provided in three rows in the width direction and closely arranged at regular pitch intervals in the length direction.

  In addition, although not shown, one end side of a total of five pipes 48 (low humidity ducts) is connected to the ceiling wall of the low temperature and low humidity zone D2 at regular intervals along the transfer direction of the board raw material 2. Among these, the other end side of the pipe located on the most upstream side is connected to the reflux pipe P via the blower B, while the other four pipes are connected to the primary side heat exchange of the heat exchanger 45 on the other end side. The chamber 46A is connected in order from the upstream side. Accordingly, only the pipe connected to the primary side heat exchange chamber 46A located on the most downstream side is not connected to the inside of the low temperature and low humidity zone D2, and only this can be opened to the outside air and the outside air can be taken in. ing.

  On the other hand, in the low-temperature and low-humidity zone D2, a dry air inflow duct 42 through which the dry air from the heat exchanger 45 flows is installed along the side of the conveyor. The drying air inflow duct 42 is connected to one end face side of each blower plate 43 and communicates with each other. The inside of this dry air inflow duct 42 is divided into five chambers along the transfer direction of the board raw material 2 corresponding to each heat exchange section 46 described above. Each chamber is connected to each secondary heat exchange chamber 46B of the heat exchanger 45 via a low humidity duct 48 provided with an air supply fan 51. As a result, the outside air taken in from the low-humidity duct 48 is subjected to heat exchange with the exhaust heat of the exhaust pipe 35 in each heat exchange section 46. Since the outside air has a lower humidity than the inside of the dryer, low-humidity drying air is supplied into the low-temperature and low-humidity zone D2 via the second blower unit 41. In the low-temperature and low-humidity zone D2, the atmosphere at the upstream end is about 120 ° C., but gradually decreases toward the downstream side, and further to about 80 ° C. immediately before passing through the low-temperature and low-humidity zone D2. Has been lowered.

  Then, the effect of this embodiment comprised as mentioned above is demonstrated.

  First, a slurry-like board raw material is flowed from the mixer 6 to the front-side board base paper fed from the first roll 5 onto the conveyor 1. In this case, as described above, since the board base paper is folded inward on both sides to form an upward C-shape as a whole, the slurry raw material does not flow down. Next, in the process in which the back side board base paper fed out from the second roll 8 passes through the roller 7, the slurry raw material is wrapped in the front and back board base paper, whereby the board raw material 2 as a continuous body without any breaks. Molded. Thereafter, the board raw material 2 undergoes a hydration and curing reaction with respect to the slurry raw material during the process up to the dryer D9.

  Then, the board raw material 2 enters the dryer D. Here, the board raw material 2 passes through the high temperature and high humidity zone D1 and then passes through the low temperature and low humidity zone D2.

  First, when the board raw material 2 enters the first zone 10 while hot air of about 80 ° C. is blown at the entrance portion, the board raw material 2 is heated by moving through the region of about 150 to 170 ° C. Reaches the first blower section 15 after being increased overall including the inside.

  In the 1st blower part 15, 280-300 degreeC drying air is sprayed on the board raw material 2 from the blow box 16 which opposes up and down at a substantially right angle, and it will be in a high temperature state. Here, the drying air blown from the outlet 50 of each chamber in the central chamber 16A, the intermediate chamber 16B, and the end chamber 16C in the blow box 16 is adjusted by the damper 49 so that the air volume decreases in order from the central chamber side. . Therefore, in the board raw material 2, the dry air with a small air volume is blown at both ends in the width direction where the drying is most likely to proceed, and conversely, the air is blown with a large air volume at the central portion where drying is most difficult. Then, the middle air volume is blown. Thus, the board raw material is dried almost uniformly on both the front and back sides.

  The board raw material 2 that has passed through the first blower unit 15 enters the second zone 20 and the third zone 30 in a high temperature state. Here, the board raw material 2 is kept at a high temperature to promote the evaporation of moisture inside, and the temperature of the board raw material 2 is gradually lowered toward the downstream side. In the second zone 20, the temperature on the inlet side is about 280 to 300 ° C, but the temperature gradually decreases as it reaches the outlet side, and the temperature on the outlet side of the second zone is about 150 to 170 ° C. . Further, in the third zone 30, the temperature on the inlet side is about 150 to 170 ° C., but the temperature on the outlet side is about 120 ° C. As the temperature of each zone decreases, the temperature of the board raw material 2 also gradually decreases.

  The board raw material 2 that has passed through the high temperature and high humidity zone D1 as described above subsequently enters the low temperature and low humidity zone D2. In the low-temperature and low-humidity zone D2, the drying air is blown from the blow box 16 facing up and down. This dry air is obtained after the outside air taken in from the low-humidity duct 48 is subjected to heat exchange with the exhaust heat in the heat exchanging section 46, whereby the low temperature and low humidity zone D2 is compared with the high temperature and high humidity zone D1. In a low temperature and low humidity atmosphere. Therefore, since the board raw material 2 passes through the low-temperature and low-humidity zone in a state where the temperature of the whole board raw material 2 is lowered, heat removal from the dryer is reduced. In addition, the temperature difference between the low-temperature and low-humidity zone D2 and the outside air is sufficiently small compared to the conventional one, so that it is difficult for condensation to occur in the conveyor equipment at the outlet portion, and there is also a problem of spots due to dripping of condensed water. In addition, it can be avoided.

  Further, in the dryer D of the present embodiment, the heat source of the exhaust pipe 35 discharged from the high temperature and high humidity zone D1 is used as the heat source of the low temperature and low humidity zone D2, and a heat source dedicated to the low temperature and low humidity zone D2 is not provided. Can save energy.

  In this way, the board raw material 2 that has passed through the dryer D enters the cutter unit 15. In the cutter unit 15, a circular saw (not shown) is rotationally driven based on a command from a control device (not shown), and the board raw material 2 is cut with a predetermined width and cut out as a gypsum board product S having a desired size. .

  As described above, according to the present embodiment, the blow box 16 is partitioned into the plurality of chambers 16A to 16C in the width direction, and the dry air whose air volume is individually adjusted is supplied to each of the chambers 16B. The board raw material 2 can be dried uniformly.

  Further, in the present embodiment, the board raw material 2 passes through the dryer D through drying in the high temperature and high humidity zone D1, and then passes through the low temperature and low humidity zone D2. In this low-temperature and low-humidity zone D2, by taking in outside air with low humidity, it is possible to reduce heat removal by the board and to avoid dew condensation at the dryer outlet. Further, in the low temperature and low humidity zone D2, the high temperature and high humidity air evaporated from the board raw material is not dried unlike the high temperature and high humidity zone D1, but the exhaust heat from the high temperature and high humidity zone D1 is used and the low temperature and low humidity is used. Since it is intended to dry with the air, energy saving effect is also obtained. Moreover, since the heat of the low temperature and low humidity zone D2 is also recovered by the reflux pipe P and used for heating the high temperature and high humidity zone D1, the energy saving effect is further enhanced.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.

  (1) In the above embodiment, in the low-temperature and low-humidity zone, a plurality of heat exchange units are arranged, but the number is not limited.

  (2) In the above embodiment, four pairs of blow boxes 16 are provided in the first blow unit 15, but four or more pairs of blow boxes 16 may be provided.

  (3) In the above embodiment, air is supplied from the reflux pipe P to each burner unit, but outside air may be introduced into each burner unit.

  (4) In the above embodiment, in the low-temperature and low-humidity zone, the drying air is blown at right angles from the blow part to the board raw material, but from the entrance side to the outlet side, that is, along the surface of the board raw material. For example, the drying air may be supplied by a fan.

Perspective view of the entire manufacturing equipment Schematic diagram showing the structure of the dryer Cross section of the first zone Side sectional view of the first zone Front sectional view near the entrance of the first zone Enlarged side view of the first zone near the first blower section An enlarged plan view near the first blower part of the first zone Front sectional view near the first blower part of the first zone Front sectional view near the first blower part of the first zone Front sectional view near the first blower part of the first zone Cross section of the second zone Side sectional view of the second zone Cross section of the third zone Side sectional view of the third zone Top view of low temperature and low humidity zone Side view of low temperature and low humidity zone Side sectional view of the second blower section Plan view of the second blower section

Explanation of symbols

2 ... Board raw material D ... Dryer D1 ... High temperature high humidity D2 ... Low temperature low humidity zone 10 ... 1st zone 20 ... 2nd zone 30 ... 3rd zone P ... Circulation pipe 15 ... 1st blower part 16 ... Blow box 16A-16C ... Chamber 35 ... Exhaust pipe 41 ... Second blower section 45 ... Heat exchanger

Claims (4)

A conveyor for conveying the board raw material formed by pouring the slurry raw material between the base papers for board, and the board raw material are allowed to pass through the board raw material in the lengthwise direction to dry the board raw material. A gypsum board dryer comprising a dryer and a cutter that is arranged downstream of the dryer and cuts the raw board material into a desired length.
The dryer is provided with a drying air supply means for supplying drying air over almost the entire width of the board raw material being transported by the conveyor, and the drying air supply means has a width of the board raw material. A gypsum board dryer characterized in that it supplies a large amount of air to the central part in the direction and supplies a small amount of air at both ends in the width direction. Inside the dryer, a blow box connected to the supply source of the drying air having a width across the entire width of the board raw material facing the board raw material on the way of conveyance by the conveyor is arranged, And the inside of this blow box is divided into a plurality of chambers along the width direction, and each chamber is individually connected to a duct for supplying dry air, and each duct is provided with an air volume adjusting means for the dry air. The gypsum board dryer according to claim 1, wherein The dryer is composed of a high-temperature and high-humidity zone arranged on the upstream side and a low-temperature and low-humidity zone arranged on the downstream side. The low-temperature and low-humidity zone takes in outside air and exhausts the outside air and the high-temperature and high-humidity zone. The gypsum according to claim 1 or 2, wherein a low-humidity duct for blowing low-humidity air to board raw material that passes through the low-temperature and low-humidity zone after heat exchange with heat is provided. Board dryer. The high-temperature, high-humidity zone and the low-temperature, low-humidity zone are connected by a reflux pipe that circulates air in the low-temperature, low-humidity zone toward the high-temperature, high-humidity zone. Dryer for plasterboard.

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