JP2010060256A - Hot air circulating type auto rack dryer and drying method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot air circulating type auto rack dryer and drying method using the same, uniformly and favorably drying material to be printed such as printing paper. <P>SOLUTION: This hot air circulating type auto rack dryer includes a hot air dying part for drying material to be printed. The hot air drying part includes a plurality of units, and each unit includes an upper area and a lower area. Each unit includes a heat source, a fan and a pair of first regulating plates. Each regulating plate includes: a body plate part, the inner edge of which is fitted to a side surface part of the heat source in the upper area, and the outer edge of which is separated from the inner wall of the unit; and an extending plate part extended from the outer edge of the body plate part along the inner wall of the unit up to the inside of the lower area. Hot air generated by heating the heat source and driving the fan in rotation flows from the upper area side to the lower area side while being regulated by each first regulating plate. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a hot-air circulating auto rack dryer and a drying method using the same, and more particularly, to a hot-air circulating auto rack dryer that can be used for drying printed materials such as printing paper and a drying using the same. It is about the method.

Conventionally, various dryers are known (for example, refer to Patent Documents 1 to 3).
JP-A-3-288709 Japanese Patent Laid-Open No. 5-208728 JP-A-6-055123

  However, the conventional hot air circulation type auto rack dryer has a non-uniform circulation of the hot air in the hot air drying section of the dryer, and as a result, it is difficult to uniformly and well dry printed materials such as printing paper. Met.

  The present invention has been made in view of the above-described problems of the prior art, and suppresses variations in drying, and can be used to uniformly and satisfactorily dry printed materials such as printing paper. An object is to provide a rack dryer and a drying method using the same.

  The present invention is a hot air circulation type auto rack dryer for drying a printing material, wherein the hot air circulation type auto rack dryer includes a hot air drying unit for drying the printing material, and the hot air The drying unit is composed of a plurality of units arranged along the moving direction of the substrate, and each unit is composed of an upper region and a lower region, and each unit is located in the upper region. A heat source disposed in the center of the heat source, a fan provided above the heat source, and a pair of first restriction plates that extend along the moving direction of the substrate and are attached to the side surfaces of the heat source. Each of the first restriction plates includes a main body plate portion whose inner edge portion is attached to a side surface portion of the heat source in the upper region and whose outer edge portion is separated from the inner wall of the unit, and the main body plate. And an extension plate portion extending from the outer edge portion of the portion along the inner wall of the unit to the lower region, and hot air generated by heating the heat source and rotating the fan. A hot air circulation type autoclave dryer is provided which flows from the upper region side to the lower region side while being regulated by the first regulation plates.

  Further, the main body plate portion can be constituted by an upright portion standing along the side surface of the heat source from the inner edge portion and an inclined portion extending from the upright portion to the outer edge portion. In addition, at least one ventilation portion may be formed on the extension plate portion.

  The upper region of each unit may further include a hood arranged to cover the heat source, the fan, and the first restriction plates. Further, the hood extends along the moving direction of the printing material, and the cross section can be formed in an inverted U shape in a plane orthogonal to the moving direction of the printing material.

  Each of the units is configured to cause a hot air flowing from the upper region side to the lower region side to flow to the lower side of the substrate in the unit while being restricted by the first restriction plate. Two regulating means can be provided.

  Furthermore, this invention provides the method of drying a to-be-printed material using the hot-air circulation type auto rack dryer as described in any one of Claims 1 thru | or 6.

  According to the present invention, variation in drying can be suppressed, and a printed material such as printing paper can be dried uniformly and satisfactorily.

  The best mode for carrying out the hot air circulation type auto rack dryer and the drying method using the same according to the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic diagram of a hot air circulation type auto rack dryer for drying a printing material such as printing paper according to the present invention, FIG. 2 shows a longitudinal sectional view thereof, and FIG. FIG. 3 shows a cross-sectional view taken along line AA shown in FIG. As shown in FIGS. 1 and 2, a hot air circulation type auto rack dryer 1 according to the present invention is a so-called wicket conveyor type provided with a hot air drying unit 10 for drying a printed material such as printing paper in an upper portion. The conveyor chain 3 wound around the sprockets 2 provided at both ends in the longitudinal direction of the dryer 1 is perpendicular to the longitudinal direction of the dryer 1 (orthogonal to the paper surface in FIG. 2). The plurality of leaves 4 arranged at regular intervals are attached to the outer periphery of each conveyor chain 3, and the conveyor chain 3 is driven by a driving means (not shown) such as a motor, Each leaf 4 is reversed and moved (conveyed) in the main body of the dryer 1 in a plane perpendicular to the installation surface of the dryer 1. The leaf 4 is provided with a gripper (indicated by reference numeral 4a in FIGS. 3 and 5), and the substrate 100 is printed on the leaf 4 in a state where the base end portion of the substrate such as printing paper is gripped by the gripper. Can be placed. In FIG. 3, the printed material 100 placed on the leaf 4 in a state where the base end portion of the printed material such as printing paper is gripped by the gripper 4a is indicated by a two-dot chain line.

  The hot air circulation type auto rack dryer 1 is provided with a printing machine (not shown) on the upstream side, and a stacker (not shown) between the drying machine 1 and the printing machine on the downstream side. Is arranged. A printed material (indicated by reference numeral 100 in FIG. 5) printed by a printing machine arranged on the upstream side of the hot air circulation type auto rack dryer 1 is transferred from the printing machine to the input section 5 of the hot air circulation type auto rack dryer 1. It is transported and placed on the leaf 4 in a state where the base end portion of the printing material 100 is gripped by the gripper 4 a of the leaf 4 in the input portion 5. And the to-be-printed material 100 hold | maintained at each leaf 4 is hot-air dried while circulating through the hot-air drying part 10 of the upper part of the drying machine 1, and after being reversed by the inversion part 6, the lower part of the drying machine 1 It is cooled while being circulated. Then, the gripper of the leaf 4 (indicated by reference numeral 4a in FIG. 5) opens at the lower position of the input unit 5 to release the grip of the base end portion of the substrate 100. Thereafter, the substrate 100 is connected to the dryer 1. They are sequentially accumulated in a stacker (not shown) arranged between a printing machine (not shown).

  The hot air drying unit 10 described above includes a plurality of units 8 arranged in the hot air drying unit 10 along the moving direction of the substrate (the direction of the arrow indicated by reference numeral 7 in FIG. 2). Consists of nine units 8. As shown in FIGS. 3 and 4, each unit 8 includes an upper region 20 and a lower region 21. Each unit 8 includes a heat source 22 disposed in the center of the upper region 20, a fan 23 provided above the heat source 22 in the upper region 20, and a moving direction of the printing material in the hot air drying unit 10 (see FIG. 3 and a pair of first regulating plates 24 attached to each side surface of the heat source 22.

  One or more support frame members 25 extend between the left inner wall and the right inner wall of the unit 8 and are attached to the inner walls at positions where the upper region 20 and the lower region 21 in the unit 8 are separated. The base 22 a of the heat source 22 is attached on the support frame 25, so that the heat source 22 is arranged at the center in the upper region 20. The fan 23 is rotatably attached to the ceiling inner wall of the unit 8 in the upper region 20 so as to be disposed above the heat source 22.

  The pair of first restriction plates 24 includes a main body in which an inner edge portion 26 is attached to a side surface portion of the base portion 22a of the heat source 22 and an outer edge portion 27 is separated from the inner wall of the unit 8 by a predetermined distance in the upper region 20. The plate portion 30 and the extending plate portion 31 extending from the outer edge portion 27 of the main body plate portion 30 to the lower region 21 along the inner wall of the unit 8 are configured.

  The main body plate portion 30 is composed of an upright portion 30a standing along the side surface of the heat source 22 from the inner edge portion 26, and an inclined portion 30b extending from the upright portion 30a to the outer edge portion 27. The portion 30b has a shape that inclines downward from the standing portion 30a to the rear outer edge portion 27 that extends in parallel by a predetermined length. On the other hand, at least one ventilation portion 31 a is formed in the extension plate portion 31. The illustrated extension plate portion 31 has a slit-like ventilation portion 31a formed along the moving direction of the printing material in the hot air drying unit 10 (the direction orthogonal to the paper surface in FIG. 3). The extension plate portion 31 is divided by the ventilation portion 31a, and one lower portion of the extension plate portion 31 is appropriately separated from the inner wall of the unit 8 by a predetermined distance from the inner wall of the unit 8. Attached by means.

  In the upper region 20 of each unit 8, a hood 40 is provided so as to cover the heat source 22, the fan 23, and the pair of first restriction plates 24. The hood 40 extends along the moving direction of the printing material in the hot air drying unit 10 (the direction of the arrow indicated by reference numeral 7 in FIG. 2), and has a cross section in a plane orthogonal to the moving direction of the printing material. It is formed in an inverted U shape and exists almost in the entire upper region 20. Both end portions of the hood 40 are disposed on or near the inner wall of the unit 8 between the outer edge portion 27 of the main body plate portion 30 of each first regulating plate 24 and the inner wall of the unit 8.

  A pair of second regulating means 50 is attached to each inner wall of each unit 8 in the lower region 21. As will be described later, the pair of second restricting means 50 is configured to allow the hot air flowing from the upper region 20 side to the lower region 21 side while being restricted by the first restricting plate 24 to be below the printed material 100 in the unit 8. It is attached to the inner wall of the unit 8 so as to be able to flow into the unit 8.

  Next, the operation of the above embodiment will be described. Hot air generated by heating the heat source 22 and rotating the fan 23 is regulated by the main body plate portion 30 and the hood 40 of each first regulating plate 24 in the upper region 21, and each first regulation is performed. The gas flows from the upper region 20 side to the lower region 21 side while being guided by the elongated plate portion 31 of the plate 24 and the inner wall of the unit 8. The hot air that has flowed from the upper region 20 side to the lower region 21 side flows into the lower side of the substrate 100 in the unit 8 by the second restricting means 50 positioned below the elongated plate portion 31, and this substrate The hot air flowing into the lower side of 100 flows upward and flows into the upper region 20 through the heat source 22. Due to the circulation of the hot air, the substrate 100 such as printing paper can be dried uniformly and satisfactorily.

  Here, the dried state of the printed material in the conventional hot-air circulating auto rack dryer was compared with the dried state of the printed material in the hot-air circulating auto rack dryer according to the present invention. FIG. 5 shows the printing material 100 placed on the leaf 4 with the base end gripped by the gripper 4a. In FIG. 5, the direction orthogonal to the paper surface is the moving direction of the printing material in the hot air drying unit 10 (the direction of the arrow indicated by reference numeral 7 in FIG. 2). Further, according to the present invention, the temperatures of the six regions (upper left region 61, middle upper region 62, upper right region 63, lower left region 64, middle lower region 65, lower right region 66) of the substrate 100 shown in FIG. The drying condition of the substrate in the hot air circulation type auto rack dryer was examined. The examination conditions were a set temperature in the hot air drying unit 10 of 80 ° C., a speed of the conveyor chain 3 of 24 mm / s, a rotational speed of the fan 23 of 1800 rpm, and a sampling time of 10 seconds. FIG. 6 is a graph of the examination results at that time. As shown in FIG. 6, the temperature difference in the six regions of the printing material 100 is stable within 10 degrees in the vicinity of the exit of the hot air drying unit 10 in the printed material that is hot-air dried while being circulated and conveyed in the hot-air drying unit 10. You can see that This means that the circulation of the hot air in the hot air drying unit 10 of the dryer is uniform, the variation in drying is suppressed, and the printed material such as printing paper is dried uniformly and satisfactorily. Means. On the other hand, FIG. 7 shows a dried state of a substrate in a conventional hot-air circulating type auto rack dryer. The examination conditions are the same as the examination conditions in the present invention, but the examination was performed based on the temperatures in the four areas (the middle upper area 62, the lower left area 64, the middle lower area 65, and the lower right area 66) of the substrate 100. As shown in FIG. 7, the printed material that is hot-air dried while being circulated and conveyed in the hot-air drying unit 10 varies in the temperature difference in the four regions of the printed material 100 even when the printed material is near the outlet in the hot-air drying unit 10. It turns out that it is not stable. This means that the circulation of hot air in the hot air drying unit 10 of the dryer is non-uniform. By comparing the drying state, the hot air circulation type auto rack dryer according to the present invention has a uniform circulation of hot air in the hot air drying unit 10 of the dryer as compared with the conventional hot air circulation type auto rack dryer. It was found that variations in drying can be suppressed, and printed materials such as printing paper can be dried uniformly and satisfactorily.

FIG. 1 is a schematic view showing an embodiment of a hot air circulation type auto rack dryer according to the present invention. FIG. 2 is a longitudinal sectional view showing the above embodiment. 3 is a cross-sectional view taken along line AA shown in FIG. FIG. 4 is a partial perspective view showing the above embodiment. FIG. 5 is a diagram of a substrate that can be applied to the above embodiment. FIG. 6 is a graph showing the dry state of the substrate in the above embodiment. FIG. 7 is a graph showing a dry state of a printing material in a conventional hot air circulation type autoclave dryer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot-air circulation type auto rack dryer 2 Sprocket 3 Conveyor chain 4 Leaf 4a Gripper 5 Input part 6 Inversion part 8 Unit 10 Hot-air drying part 20 Upper area | region 21 Lower area | region 22 Heat source 22a Base 23 Fan 24 1st control plate 25 Support frame Member 26 Inner edge portion 27 Outer edge portion 30 Main body plate portion 30a Standing portion 30b Inclined portion 31 Extending plate portion 31a Ventilation portion 40 Hood 50 Second restricting means 61 Upper left region 62 Middle upper region 63 Upper right region 64 Left lower region 65 Middle lower Area 66 Lower right area 100

Claims (7)

A hot air circulation type auto rack dryer for drying a substrate,
The hot air circulation type auto rack dryer includes a hot air drying unit for drying the printed material,
The hot air drying unit is composed of a plurality of units arranged along the moving direction of the substrate,
Each unit is composed of an upper region and a lower region,
Each unit extends along the moving direction of the substrate, and is attached to each side part of the heat source, a heat source disposed in the center of the upper region, a fan provided above the heat source, and a moving direction of the substrate. A pair of first restriction plates;
Each of the first restriction plates is
A main body plate portion having an inner edge attached to a side surface of the heat source in the upper region and an outer edge spaced from the inner wall of the unit;
Each of the main body plate portion and the extension plate portion extending from the outer edge portion of the main body plate portion along the inner wall of the unit into the lower region,
Hot air circulation type auto, wherein hot air generated by heating the heat source and rotating the fan flows from the upper region side to the lower region side while being regulated by the first regulating plates. Rack dryer. The said main body plate part is comprised by the standing part which stood up along the side surface of the said heat source from the said inner edge part, and the inclined part extended from this standing part to the said outer edge part, It is characterized by the above-mentioned. The hot air circulation type autoclave dryer according to 1. 3. The hot air circulation type auto rack dryer according to claim 1, wherein at least one ventilation portion is formed in the extension plate portion. The hood disposed so as to cover the heat source, the fan, and the first restriction plates is further provided in the upper region of each unit. The hot air circulation type auto rack dryer according to any one of the above. 5. The hood extends along a moving direction of the substrate, and has a cross section formed in an inverted U shape in a plane orthogonal to the moving direction of the substrate. Hot air circulation type auto rack dryer as described. Each unit has a second region for flowing hot air flowing from the upper region side to the lower region side while being restricted by the first restriction plate in the lower region. The hot air circulation type auto rack dryer according to any one of claims 1 to 5, further comprising a regulating means. A method for drying a printing material using the hot air circulation type auto rack dryer according to any one of claims 1 to 6.

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