JPS61217673A - Multi-cylinder type drier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a multi-tube drying device for heating and drying a wide range of wet materials such as paper and paperboard.

(Prior art) As the above-mentioned device, for example, Japanese Patent Publication No. 52-117
No. 84, JP-A-58-70794, JP-A-59-15
A multi-tube drying device as shown in Japanese Patent Publication No. 7595, a three-cylinder vacuum drying device as shown in Japanese Patent Publication No. 38-25156, Japanese Patent Publication No. 53-10692, and Japanese Unexamined Patent Publication No. 1987-10692.
A special type of drying device is known as shown in Japanese Patent No. 7-154492.

C) Problems to be Solved by the Present Invention) In all of the above-mentioned conventional multi-tube drying devices, strip-shaped wet material supported by a flexible, air-permeable endless strip such as canvas is wound one after another around a large number of heating barrels arranged in upper and lower rows. The material is transported and dried while it is being stained. Since the wet material is conveyed in a free running state between the heating cylinders, even if it is supported by an endless band, it sometimes flutters and releases its support, which often causes the wet paper to swell or tear. Ta. Especially the above-mentioned Japanese Patent Application Publication No. 58-70
In the method disclosed in Japanese Patent No. 794, a vacuum KL is applied to the non-supporting surface of the endless belt in the free running area, and the damp material is sucked onto the supporting surface of the endless belt and transported while being restrained and supported.

However, the vacuum forming means not only has a complicated structure, but also has a side wall and a top closing body whose ends are in close sliding contact with the non-supporting surface of the endless band and the outer periphery of the heating cylinder, respectively. However, there were many structural problems such as the end portions of each side wall being easily worn out.

In addition, the vacuum drying device as shown in the above-mentioned Japanese Patent Publication No. 3B-25156 is simply a multi-tube drying device housed in a completely sealed vacuum hood, and even if the device can be made smaller and has a high drying efficiency. Even if this could be realized, the structure of the vacuum forming means would be complicated and expensive, and there would be problems in operability, such as the vacuum having to be interrupted in the event of breakage of the running wet material. However, there are many practical problems that must be solved, such as the seal structure.

(Technical problem of the present invention) Therefore, in the present invention, heating and vacuum evaporation are repeated to dry the wet material while it is conveyed in a restrained and supported state over the entire conveyance path, and even if the wet material is run at high speed, the wet material does not break. Make sure there is no flapping. Wrap the damping material around the heating surface of the heating tube as long as possible in the circumferential direction to bring it into direct contact with the heating surface to suppress heat release from the heating surface, and to prevent moisture emanating from the damping material from escaping to the outside and directly collect it. do. Furthermore, the moisture distribution in the width direction of the wet material (hereinafter referred to as moisture profile) can be adjusted at any time as desired, and in addition, there are no members that come into sliding contact with the endless belt or heating tube, allowing them to run and rotate at high speed. Another object of the present invention is to realize high-speed drying with high drying efficiency and high heat recovery rate while minimizing wear and tear on the endless belt and the like.

(Means for Solving the Problems) The technical means of the present invention is to provide an upper heating cylinder arranged as an upper row for heating the wide wet material, and a lower heating cylinder arranged as a lower row facing in a different positional relationship. and each row of flexible breathable endless belts wound around the upper surface of the upper heating cylinder and the lower surface of the lower heating cylinder, which directly wrap and press the wet material, respectively, and Introducing and extracting suction cylinders are arranged near the front and rear parts of the lower surface of the upper heating cylinder, the surfaces of which absorb and support the damping material, and the lower row of endless bands are wound around the surfaces of the damping material. Introductory and lead-out suction cylinders are provided near the front and rear portions of the upper surface of the lower heating cylinder, and in the upper and lower rows, the endless belt is attached to and supported by the inlet suction cylinder. The hook is sequentially passed through the heating tube to the outlet suction tube, and further to the subsequent introduction suction tube, and at least between the outlet suction tube on one side and the introduction suction tube on the other side facing it, each of the above-mentioned The endless belts are guided so as to sandwich the wet material with each other and convey it.

The heating cylinder used in the present invention may be one that heats with steam, which is normally installed in paper machines, but it may also be one that heats with other high-temperature media such as hot oil, or one that heats with electric heat. do not have. Felt and canvas commonly used in paper machines are suitable for the flexible, air-permeable endless band, but highly air-permeable ones with an air permeability of 3000 Ifl''/rn'' h or more are particularly preferable, and furthermore, it is preferable to use felt or canvas that is normally used in paper machines. Most preferred are those with variable air permeability that are engineered to reduce the air permeability of the edges.

Alternatively, it may be a perforated synthetic resin ribbon or metal ribbon. As a suction cylinder, a large number of pores are opened on the outer peripheral surface, and both ends are rotatably supported and driven to rotate, or the cylinder is rotated by the movement of an endless band wrapped around the outer peripheral surface. It has an outer tube, and a concentric inner tube extends across the inner width direction, and the wet paper web is supported and conveyed on the surface of the endless belt so that only the pores on the outer peripheral surface receive room pressure. an airtight chamber formed by partitioning the inner surface of the outer cylinder and the outer circumferential surface of the inner cylinder with a partition wall in the width direction and circumferential direction, and both ends of the inner cylinder are fixedly supported; One end of each partition wall is fixed to the outer circumferential wall of the inner cylinder, and a sealing means for sealing between the partition wall and the inner surface of the nuclear outer cylinder is attached to the tip. As the sealing means, an annular or rod-shaped member made of aluminum, a labyrinth sealing member, a magnetic fluid sealing member, or the like is used, and is arbitrarily selected depending on the strength of the chamber pressure.

In the nuclear hermetic chamber, a small chamber can be formed by partitioning the nuclear airtight chamber in the width direction and/or circumferential direction with a partition wall provided with a sealing means similar to that described above. The position and number of the partition walls partitioning in the width direction and/or circumferential direction can be arbitrarily determined. Each of the chambers has a vent connected to a vent pipe. Further, each of the small chambers is equipped with pressure regulating means for individually adjusting the chamber pressure of each chamber. The pressure regulating means may be a pressure regulating device of a known construction, which includes a chamber pressure detector communicating with each of the small chambers, and a regulating valve connected to a vent pipe of each of the small chambers.

Each of the ventilation pipes is connected via the regulating valve to one or more main ventilation pipes inserted into the inner cylinder, and each of the main ventilation pipes is connected to a pressure or vacuum pump, respectively.

Or connected to a forced or suction fan.

(Example) FIG. 1 is a schematic side view for explaining an example of a multi-tube drying device according to the present invention.

In the figure, 1 and 2 are upper heating cylinders arranged as an upper row for heating the strip-shaped wet material W, 3 and 4 are lower heating cylinders arranged as a lower row facing the upper heating cylinders 1 and 2 in a different positional relationship, 8 is wet material W
The upper row of flexible breathable endless bands 9 wrap around the upper surfaces of the upper heating tubes 1 and 2 that are directly wrapped and pressed, and 9 is the lower surface of the lower heating tubes 3 and 4 that the wet material W is directly wrapped around and pressed against. The lower row of flexible breathable endless bands 1α, 1 &, 28, 2b is the upper row endless band 8.
suction tubes 3a, 3b, 4a, arranged near the front and rear portions of the lower surfaces of the upper heating tubes 1 and 2, respectively, around which the wet material W is wound and supported by suctioning the wet material W;
Reference numeral 4b designates introduction and extraction suction cylinders arranged near the front and rear portions of the upper surfaces of the lower heating cylinders 3 and 4, around which the lower row endless bands 9 are wound, and the wet material W is sucked and supported on the surface thereof. In the upper and lower rows, the endless band 8 passes from the introduction suction tube 1α through the upper heating tube 1 to the output suction tube 1b, further to the subsequent introduction suction tube 2α, and from there to the output suction tube 2b via the upper heating tube 2. The hooks are passed one after another, and the lower row endless belt 9 is introduced into the suction cylinder 3α.
The hook is sequentially passed through the lower heating cylinder 3 to the output suction cylinder 5b, further to the subsequent introduction suction cylinder 4a, and from there through the lower heating cylinder 4 to the output suction cylinder 46.

Upper lead-out suction tube 1b and lower introduction suction tube 3 facing it
α and the guide roll iC so that the endless bands 8 and 9 convey and feed the wet material W while holding the wet material W between them.
, 3C, between the upper lead-out suction tube 3b and the upper introduction suction tube 2a, and.

In these, the endless bands 8 and 9 are guided by guide rolls 5c and 2e so as to sandwich and convey the wet material pipes between the upper outlet suction tube 2b and the lower introduction suction tube 48.
And, in those, each endless belt 8, 9 is mutually wetted material W.
The suction tube 406.41 is guided by guide rules 4c and 4c so as to pinch and convey
Sent via &.

Guide 0-ru 1'+2eH5c14' blows out hot air from the outer circumferential surface portion that engages with the endless band 8 or 9, which is a variable air permeability canvas. A suction guide O-ru 1d supported on the endless band 9,
Further, on the delivery side of the wet paper web W, pressure guides 4d for separating the wet material W from the upper endless band 8 are arranged. The endless bands 8 and 9 are guided by guide rolls 1m and 4a, respectively, and returned individually from the sending side to the feeding side.

The lead-out suction tube 1b has a large number of pores 11 opened on its outer circumferential surface, and side end members 12 and 13 each have a bearing 50 and a fixed axis 5.
It has an outer cylinder 10 that is rotatably supported via a tube 50, and a concentric inner cylinder 6 extends in the width direction of the inner side of the outer cylinder 10, so that only the pores on the outer peripheral surface of the wet paper W wrapper receive room pressure. Inner cylinder 6 and outer cylinder 1
0 in the width direction and circumferential direction of the partition wall 601.
It has an airtight chamber partitioned by 60 and 61.61.

The airtight chamber is composed of 5×5 small chambers 62 that are partitioned in the width direction and circumferential direction by partition walls 60a and 61B, respectively, and each chamber has a ventilation port 64 connected to a ventilation pipe 63. Each of the compartments is provided with a pressure regulating means for individually regulating the pressure in the compartment. The pressure regulating means includes a pressure sensor 70 that communicates with the small chamber 62 and a regulating valve 71 that is connected to the vent pipe 63. They are connected via a regulator (not shown).

Each ventilation pipe 63 is a main ventilation pipe 65°66 inserted into the inner cylinder 6.
1C connected and 2 ventilation main pipe 65 is a vacuum pump (not shown)
Furthermore, the main ventilation pipe 66 is connected to a pressure pump (not shown). A gear 14 is attached to a side end member 13 of the outer cylinder 10, and a gear 15 driven by an electric motor (not shown) and the gear 14 mesh with each other. The other suction tubes have substantially the same structure as described above, except for the number of small chambers.

(Operation) The above technical means operates as follows. The wet material W, which has been dewatered to a water content of around 60% in the water squeezing section of the paper machine, is suction-supported by the surface of the lower row endless band 90 that is engaged with the suction guide O-ru 1d, and is It is conveyed to the band 9, is sucked and supported by the surface of the upper row endless band 80 wrapped around the vacuum area 10α of the introduction suction cylinder 1α, and is introduced into the upper heating cylinder 1. At that time, the wet material W passes over the pressurized area 11α of the introduction suction cylinder 1a, is pressed, and is securely wrapped around the smooth outer circumferential surface of the upper heating cylinder 1, which is heated to around 100° C. without flapping. , and is pressed against the endless band 8 and rapidly heated. Next, the wet material W is -70*-80t-100t-801-70%Hjl
The chamber pressure of each small chamber is regulated so as to have a vacuum value distribution in the width direction, and the vacuum reaches the vacuum region 106 on the suction cylinder 1b, where it is sucked into the suction cylinder and smoothly separated from the heating cylinder 1. With K.

It sticks to the surface of the endless band 8 and is wound around the introduction suction cylinder 16. The wet material W reaches the vacuum area 116 next to the introduction suction cylinder 1b and moves in the width direction by -100, 120y 150t -120, -100
%Hjl is applied to the vacuum area 126 and -12(
]+-15(]+200t-150,-120'X
Rapid drying under 5Hf vacuum. Further, the wet material W is depressurized in the next vacuum area 136, which is regulated to have the same widthwise vacuum value distribution as the vacuum area 11/l, and is then pressed into the introduction suction tube 3α in the pressurizing area 146, and is Vacuum area 3 of the introduction suction cylinder 3α whose pressure is regulated to the same width direction vacuum value distribution as area 116
The suction tube 6 is sucked and supported by the surface of the lower row endless band 9 at 0α.
wrapped around a. The wet material W is in the vacuum area 31α next to the suction cylinder 5a.
It reaches -140°-1801-2501- in the vacuum area 52α and receives the same vacuum in the width direction as the vacuum area 126.
Under the vacuum of 1801-14 CIHf, the wet material W dries quickly from the back side. Furthermore, the wet material W is in the vacuum area 52.
After receiving the same vacuum as α in vacuum area 33α, pressurized area 34
g, it is pressed against the lower heating cylinder 3, and is reliably wrapped around the smooth outer circumferential surface of the lower heating cylinder 3 to be heated.

As described above, the wet material W is heated in the lower heating cylinder 3, vacuum-dried in the suction cylinders 3b and 2a, heated again in the heating cylinder 2, vacuum-dried in the suction cylinders 2b and 4α, and finally After being heated in heating tube 4.

It is vacuum dried in a suction tube 461406f4j6 and sent out. Next, the wet paper web W is sent to a subsequent multi-tube dryer (not shown) at a desired transport speed to adjust its tension.

Next, the operation of the outlet suction tube 1b will be explained in more detail.

The pressure detectors 7o communicate with the small chamber 62 formed at the center in the width direction of the suction cylinder 1b via a conduit, and detect the degree of vacuum or pressurization of the small chamber 62, respectively.゛Each small room 6 other than the small room 62
Regarding No. 2, the pressure difference in each chamber 62162 is detected by the pressure detector 7o which communicates with each of the adjacent small chambers 62 + 62 via a conduit with the partition wall 6°α or 61G in between.

The degree of vacuum or pressurization of each small chamber 62 is controlled by a pressure regulator (
(not shown), each vacuum area 10b, 116°126,
136 and the pressurized area 146 are set and automatically adjusted to have desired width direction vacuum value and pressure value distribution, respectively. In this case, by changing the settings of a pressure regulator (not shown) that adjusts the pressure in the small chamber 620 at the center in the width direction, the degree of vacuum and/or Pressure is increased or decreased.

In addition, the moisture profile of the paper material W after drying is detected by a well-known moisture meter (not shown), and the target value of the pressure regulator is changed individually and by a small width one after another, and the moisture meter's response is It is possible to reversely detect the suction tube and its small chamber that exhibit the maximum value of , and change the settings of each pressure regulator individually.

Furthermore, adjusting the width direction vacuum value and pressure value distribution K
As a result, leakage between the small chambers 62 can be reduced, and high vacuum drying becomes possible.

Note that each heating cylinder and each suction cylinder are driven at a predetermined rotation speed. In addition, a suction tube (not shown) for sucking out moisture is located in a pocket surrounded by the heating tube and the inlet and outlet suction tubes adjacent to it.
is attached to suck out the moisture. Furthermore, the highly humid moisture sucked through the main ventilation pipe of each suction tube passes through a well-known exhaust heat recovery device (not shown), and its retained heat and condensed water are recovered at a high rate.

(Effects of the Invention) As detailed above, according to the present invention, the following effects can be achieved.

That is, since the wet material is maintained in a restrained and supported state over its entire conveyance path and dried by repeated heating and evaporation, breakage due to unstable movement of the wet material is eliminated. Therefore, unlike conventional devices, the wet material breaks and scatters, and there is no need for a large space for cleaning or storing the remaining material, so the device itself can be made smaller.

In addition, high-speed drying becomes possible.゛Also, the wet material is wrapped around the heated smooth surface of the heating tube for a long time.

Since both sides of the wet material are alternately brought into direct contact with the surface and heated, heat release from the heating tube can be suppressed.

In addition, since the heated wet material is dried under high vacuum as described above, even low-temperature wet material is actively evaporated, so the heating temperature can be lowered and the evaporation rate can be significantly increased. Moreover, since the sucked moisture has high humidity, less power is consumed for the suction, and heat recovery from the moisture can be performed efficiently. Furthermore, there is no need to use a completely closed hood like in conventional vacuum drying equipment.

Furthermore, since the vacuum value distribution in the width direction in each vacuum region of any suction tube can be adjusted at any time during the conveyance path of the wet material,
It is possible to prevent quality deterioration due to uneven drying of the wet material, and in addition, since there are no members that come into sliding contact with the endless belt or heating tube, the endless belt is subject to extremely wear and tear even if they are run at high speed or rotated at high speed. It has advantages such as less.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view for explaining an embodiment of a multi-tube drying device according to the present invention. (Explanation of symbols) 1.2 ・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・－・・・・・・・・・・
・・Curved/ridge top side heating cylinder 1a t 2a ・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・
......Introduction suction tube 1b, 26...
・・・・・・・・・Song・・・・Quadruple lead-out suction tube 8 between songs
・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・
Song... Open and open upper row endless■ 3t4 ・・・・・・・・・・・・・・・・・・・・・
...Curve...Curved surface/1 song Quadruple lower heating cylinder 3α, 4
a ・・・・・・・・・・・・・・・Open・Curved surface・・
Musical introduction suction cylinders 3b, 4b ・・・・・・・・・・・・
Curved...quadruple curved surface/curved suction tube 9...
・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・Song・・・・・・Curved bottom row endless band W ・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・Curved surface quadruple curve・・・Band-shaped damp material
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Claims (1)

[Scope of Claims] 1. Upper heating cylinders each arranged as an upper row for heating a strip-shaped wet material, and lower heating cylinders arranged as a lower row facing in a different positional relationship, each directly wrapping the wet material. Each row of flexible breathable endless bands is wound around the upper surface of the upper heating tube and the lower surface of the lower heating tube, and the upper row of endless bands is wound around the upper surface of the upper heating tube and the lower surface of the lower heating tube to attract the wet material to the surface thereof. an inlet/outlet suction tube disposed near the front and rear portions of the lower surface of the upper heating cylinder, and a lower endless band around which the lower row of endless bands is wound, and the wet material is sucked onto the surface of the lower endless band and supported. Introductory and outlet suction cylinders are provided near the front and rear portions of the upper surface of the heating cylinder, and in the upper and lower rows, the endless band is further connected from the introduction suction cylinder to the output suction cylinder via the heating cylinder. At least between the one side of the outlet suction tube and the opposite introduction suction tube of the other side, the endless bands sandwich and convey the wet material. A multi-tube drying device characterized by being guided so as to 2. The suction cylinder has an outer cylinder with a large number of pores opened on the outer peripheral surface, the end of which is rotatably supported, and a concentric inner cylinder extending in the internal width direction, and a wet paper wrapping outer peripheral part. The multi-cylinder according to claim 1, which is a suction cylinder having an airtight chamber formed by partitioning the inner and outer cylinders in the width direction and circumferential direction with a partition wall so that only the pores of the cylinder receive room pressure. Type drying equipment. 3. The airtight chamber consists of a plurality of small chambers that are partitioned in the width direction and/or circumferential direction by partition walls, and each of the small chambers has a vent connected to a ventilation pipe, and the pressure in each chamber can be adjusted individually. The multi-tube drying device according to claim 2, which is an airtight chamber equipped with pressure regulating means.