JP5158540B2 - Roll finishing machine - Google Patents

Description

  The present invention relates to a roll finisher that presses and dries laundry in a dehydrated state, and is improved so that the time required for drying can be shortened without increasing the shape and number of installed heating rolls. It is.

FIG. 6 is a front view schematically showing a conventional roll finishing machine.
The heating roll 1 rotates in the direction of arrow a around a substantially horizontal axis (perpendicular to the paper surface) and is heated to 140 ° C. to 170 ° C. by superheated steam.
An endless annular belt 2 is wound around the heating roll 1, and the belt is guided by a plurality of rollers 3a to 3d and circulates. Arrows b, c, d, e, and f indicate the circulation direction.
The unfinished laundry 4 is carried in as indicated by an arrow h, supplied between the heating roll 1 and the belt 2 (arrow e), and turns in the direction of arrow a together with the heating roll and the belt. The reference numeral 5 indicates the laundry being finished.

The roller 3a also serves as a tension roller, and is urged toward the right in the figure by the air cylinder 7. The pressure air supplied to the air cylinder 7 is adjusted in pressure by the pressure reducing valve 8, and a constant tension is automatically applied to the belt 2. With this tension, the laundry 5 is pressed against the heating roll 1, heated and press-finished, and the finished laundry 6 is sent out as indicated by the arrow g.
In the conventional roll finishing machine, no special consideration is given to the belt tension, and it is set to be less than 0.15 kilogram / centimeter, and the roller 3a can withstand more force. I couldn't.

In order not to leave wrinkles in the finished laundry, Japanese Patent Application Laid-Open No. 2006-138822 “Roll Finishing Machine and Roll Finishing Method for Washed Objects” cited as Patent Document 1 has been proposed. And
Moreover, in order to prevent the laundry which is a to-be-processed object from being wound around a roll, JP-A-2005-205065 cited as “Patent Document 2”, “Method for preventing winding in roll finishing machine, and air-type winding prevention device” Is proposed.
However, no other new technology has been developed for improving the work efficiency by shortening the time required for drying laundry in roll finishing.
JP 2006-138022 A JP 2005-205065 A

In the conventional roll finishing machine shown in FIG. 6, the finished laundry must be in a naturally dry state (wetness that balances with the vapor pressure in the air in a normal living environment).
In order to increase the processing efficiency of the roll finishing machine, it is a condition that the finished laundry has been naturally dried.
For this reason, in the roll finishing machine, how to quickly dry the laundry, which is the object to be processed, to the natural dry state is the decisive factor for improving the efficiency.

  In the prior art, if the rotation speed of the heating roll is increased in order to shorten the time required for finishing, the diameter of the heating roll is increased in order to allow the moisture content of the finished laundry to reach a natural dry state. The laundry processing time must be maintained. Otherwise, a plurality of heating rolls must be arranged to constitute a so-called multistage roll finishing machine. These measures inevitably increase the shape and weight of the roll finisher and increase the manufacturing cost.

The present invention has been made in view of the circumstances described above, and the object of the present invention is the time required for drying laundry to be processed without increasing the shape and weight of the roll finishing machine. It is in providing the technology which can shorten.
If the time required for drying can be shortened without increasing the shape, weight, and number of installed roll finishing machines, it is expected that the processing efficiency of the laundry can be improved by suppressing an increase in manufacturing cost.
However, when carrying out the present invention, the shape, weight and the number of installed roll finishing machines can be set arbitrarily.

The present inventor has carefully observed and analyzed the behavior of the workpiece in the roll finishing machine, discovered that the drying speed is closely related to the belt air permeability and the belt tension. confirmed.
Therefore, the optimum air permeability and the optimum tension of the belt are searched under the correlation between the air permeability and the tension, and the invention of Embodiment 1 (Claim 1) is created,
After that, research was continued and it was discovered that the progress of drying was also related to the running speed of the belt (the peripheral speed of the heating roll), and the invention of Embodiment 2 (Claim 2) based on this new knowledge Led to the creation of
Further, the first and second embodiments were comprehensively examined and analyzed to create the invention of claim 3 as a superordinate concept, thereby completing the present invention.

In FIG. 2, the vertical axis indicates the time required for drying, the horizontal axis indicates the air permeability of the belt, the curve α when the belt tension is 0.15 kg / cm, and the belt tension is 1. It is the graph which drew curve (beta) in the case of 8 kilogram / centimeter. Although not shown, there are many similar intermediate curves between the curve α and the curve β.
The running speed of the belt (the peripheral speed of the heating roll) in the experiment of FIG. 2 is within the range of the prior art (less than 24 meters / minute) and is 15 meters / minute.
(Note) The belt running speed in the conventional example is generally 10 to 15 meters / minute.
In the time required for drying represented on the vertical axis of FIG. 2, a minimum value is recognized between the air permeability of 20,000 cubic centimeters / square centimeter · minute and 30,000 cubic centimeters / square centimeter · minute on the horizontal axis.
The invention of claim 1 is based on the principle of FIG. 2 (Embodiment 1) confirmed as described above, and creates a specific configuration that can be used industrially.

The invention of claim 1 created on the basis of the above-mentioned principle comprises a heating roll rotating around a horizontal axis, and an endless annular belt wound around the heating roll, In a roll finishing machine that puts the dehydrated laundry between the belt and presses and dries,
The belt has an air permeability of 20,000 cubic centimeters / square centimeter · minute to 30,000 cubic centimeters / square centimeter · minute,
And the tension of the belt is 0.15 kilogram / centimeter to 1.8 kilogram / centimeter.

In the experiment of FIG. 2 (Embodiment 1), no special consideration was given to the running speed of the belt. That is, the rotation speed of the heating roll was set within the range of the prior art.
However, in subsequent studies, when the belt running speed (peripheral speed of the heating roll) was significantly higher than that of the conventional example and set to 25 meters / minute, FIG. 3 (Embodiment 2) was obtained.
That is, when the belt running speed was increased, the minimum position of the time required for drying moved in the “direction of high air permeability”.

The invention of claim 2 created based on the above-mentioned new knowledge includes a heating roll rotating around a horizontal axis, and an endless annular belt wound around the heating roll, and the heating In a roll finisher that sandwiches and presses dehydrated laundry between a roll and a belt and presses and dries,
The belt traveling speed is 24 meters / minute or more,
The belt has an air permeability of 30,000 cubic centimeters / square centimeter · minute to 50,000 cubic centimeters / square centimeter · minute,
And the tension of the belt is 0.15 kilogram / centimeter to 1.8 kilogram / centimeter.
The difference from the configuration of the first aspect is as follows.
A. The belt travel speed range is high.
B. A belt with a large air flow was selected.

The invention of claim 3 has been achieved as a result of comprehensively examining the first embodiment and the second embodiment, and further experimenting and researching the drying mode of the laundry at various belt running speeds and belt tensions. A heating roll rotating around a horizontal axis, and an endless annular belt wound around the heating roll and sandwiching the dehydrated laundry between the heating roll and the belt. In a roll finisher that presses and dries,
The belt has an air permeability of 20,000 cubic centimeters / square centimeter · minute or more.

Observing the drying aspect of the laundry while changing each of the three factors of belt speed, tension and air permeability, the correlation between these factors is very complex, and it is actually The problem is extremely difficult.
However, it was confirmed that a high-efficiency roll press that could not be achieved with the prior art was possible in the region of air permeability of “20,000 cubic centimeters / square centimeter · min or more” that no one tried in the prior art. . Desirably, a value between 20,000 and 30,000 cubic centimeters / square centimeter · minute is recommended.

  According to a fourth aspect of the present invention, in addition to the constituent features of the first to third aspects of the invention, the roll finishing machine flows air in at least a part of the space in contact with the outer periphery of the belt. It is characterized in that there is provided a means for caulking.

  In addition to the constituent features of the invention of claim 4, the roll finishing machine according to the invention of claim 5 has a decompression chamber in which the means for causing the air to flow gently covers the outer periphery of the belt, And a blower for discharging the air in the decompression chamber.

  A roll finishing machine according to a sixth aspect of the present invention is the pressurizing chamber in which, in addition to the constituent features of the fourth aspect of the invention, the means for causing the air to flow gently covers the outer periphery of the belt. And a blower for pumping air into the pressurizing chamber.

The configuration of the roll finishing machine according to the invention of claim 7 is in addition to the configuration requirements of the inventions of claims 1 to 4,
A width of the belt is one belt substantially equal to a length of the heating roll;
Alternatively, the belt includes a plurality of belts whose total width dimension is substantially equal to the length dimension of the heating roll.

  When the invention of claim 1 is applied, compared with the roll finishing machine according to the prior art, the time required for drying the laundry that is the object to be processed without increasing the size and weight and hardly increasing the manufacturing cost. Can be greatly shortened, and the processing efficiency can be remarkably improved.

The invention of claim 2 is an extension of the invention of claim 1 and has the same effect as that of the invention of claim 1 in a region where the belt traveling speed is higher than that of the invention of claim 1. is there.
Since the belt running speed is high, the laundry processing efficiency is improved.

  The invention of claim 3 is a further study of the structure of claim 1 and claim 2 and carefully selected the most important and indispensable structure. In the prior art, the laundry is pressed down. By adopting the air permeability of the area that was not used as a low density and poor heat transfer (later described in detail in paragraph 0028), the roll press processing efficiency of the dehydrated laundry was improved.

  When the invention of claim 4 is applied together with the inventions of claims 1 to 3, the time required for drying can be further shortened and the processing efficiency can be further improved.

  When the invention of claim 5 or claim 6 is applied together with the invention of claim 4, effective air flow is generated with a simple structure to promote the drying of the laundry, and the effect of the invention of claim 4 is sufficiently obtained. Can be demonstrated.

  When the invention of claim 7 is applied to the inventions of claims 1 to 4, the roll finishing machine of the present invention can be rationally configured using an off-the-shelf commercial belt, and the degree of freedom in design. Is big.

<First Embodiment>
FIG. 1 is a front view schematically illustrating one embodiment of the present invention.
This embodiment is an example improved by applying the present invention to the conventional roll finishing machine shown in FIG.
A difference from the above-described FIG. 6 (conventional example) is that a variable pressure reducing valve 9 is provided in a pipe for supplying the working air to the air cylinder 7, and the roller 3a that also functions as a tension roller is provided. The applied force can be controlled arbitrarily.
The tension received by the belt 2 corresponds to about half of the cylinder output given by the roller 3a.
Although not shown, a hydraulic cylinder may be provided in place of the air cylinder 7 and a tension may be applied to the belt by supplying hydraulic oil whose pressure can be adjusted.

In the present embodiment, the tension applied to the belt 2 is set to 0.15 kilogram / centimeter to 1.8 kilogram / centimeter. In this first embodiment, it was controlled to 1.0 kilogram / centimeter.
Each roller (3a to 3d) is made stronger than the conventional example so as to withstand such a large tension.
In the present invention, a belt having an air permeability of 20,000 cubic centimeters / square centimeter · minute to 30,000 cubic centimeters / square centimeter · minute is used.
In the experiment shown in FIG. 2, a commercially available belt having a canvas permeability of 25,000 cubic centimeters / square centimeter · min was used.

The above-mentioned air permeability shall be according to the A method (Fragile method) defined in JIS L109688.27.1.
(Note) Canvas air permeability: Displays the opening degree of the dryer canvas.
The display unit is cubic centimeter / square centimeter / minute (1/2 inch water column pressure),
A pressure difference (1/2 inch water column pressure) is given to the front and back surfaces of the canvas, and at this time, the amount of air passing through the unit area per unit time is measured.

(See FIG. 2) Although it can be easily inferred that the air permeability of the belt will be related to the drying of the laundry, it has not yet been investigated experimentally or theoretically.
When the air permeability is 20,000 cubic centimeters / square centimeter · min or less, the diffusion of steam generated from the laundry is hindered and the drying time becomes longer.
However, if the air permeability is 40,000 cubic centimeters / square centimeter · min or more, the density of pressing the laundry toward the heating roll decreases, and the adhesion between the laundry and the heating roll becomes insufficient. Since the heat conduction to the laundry becomes worse, the drying time becomes longer (in the prior art, the air permeability of the belt is made less than 20,000 cubic centimeters / square centimeter · minute by placing importance on the pressing density of the laundry. ) As described above, the various conditions correlate, and under the conditions of this example (belt running speed 24 meters / minute), the optimum air permeability of the belt is 20,000 cubic centimeters / square centimeter · minute and 30,000 cubic centimeters / square centimeter · minute. Exists between.

Next, considering the belt tension, the closer to 0.15 kilogram / centimeter, the closer to 20,000 cubic centimeter / square centimeter-minute the air permeability that gives the shortest drying time,
The closer the belt tension approaches 1.8 kilograms / centimeter, the closer the air permeability that gives the shortest drying time to 30,000 cubic centimeters / square centimeter · minute.

When these relationships are combined, the belt tension is set between 0.15 and 1.8 kilograms / centimeter in order to obtain an optimum air permeability of 20,000 to 30,000 cubic centimeters / square centimeter · minute. Will have to do.
According to the inventors' experiments, it is more desirable to set the belt tension between 0.3 and 1.8 kilograms / centimeter. However (see FIG. 6), the roller 3a in the conventional roll finishing machine cannot withstand a tension of 0.3 kilogram / centimeter. Therefore, when the present invention is carried out, it is not sufficient to change the pressure reducing valve 8, and the roller 3a (Or a tension roller that works in the same way) must be rebuilt.

Considering the belt tension and the air permeability of the belt individually, it is easy to misunderstand that the matters are within the range of design considerations, but as described above, the mechanism of the effect of the belt tension and the air permeability on the drying time is explained. Elucidating and setting optimum conditions in relation to belt tension and air permeability is an invention that requires creativity that is not a design consideration.
In particular, as described above, it is not a design consideration that can be given as appropriate to give a large belt tension that would break unless it is strengthened by changing the specifications of a conventional roll finisher tension roller.
In the past, it was unexpected that the belt tension would affect the drying speed, so it was set to less than 0.15 kilogram / centimeter.

In FIG. 1 (front view) depicting the embodiment of the present invention, the heating roll 1 has a length in the direction perpendicular to the paper surface, and the belt 2 also has a width in the direction perpendicular to the paper surface.
When carrying out the present invention, from the standpoint of a roll finisher manufacturer, a belt having a desired air permeability can be purchased as a commercial product.
However, since the width dimensions of commercial belts are manufactured and supplied based on the belt manufacturer's standards, in order to match the length dimension of the heating roll that the roll finishing machine manufacturer intends to design and manufacture with the width dimension of the commercial belt. Ingenuity is required.
In this example, the required heating roller length dimension and the belt width dimension are calculated based on the required roll finish performance, and a plurality of ready-made belts are arranged side by side so as to match the calculated width dimension. A width dimension was obtained.

<Second Embodiment>
In the first embodiment described with reference to FIG. 2, the belt traveling speed is set to 15 meters / minute within the range of the conventional example (less than 24 meters / minute) without paying special consideration to the belt traveling speed. However, in the second embodiment, the belt traveling speed is set to 30 meters / minute, which is 24 meters / minute or more, based on a new experimental result (FIG. 3).
It has never been attempted to run the belt in this speed range (24 meters / minute or more).

When the belt running speed is set to a high speed region of 24 meters / minute or more, the minimum value of the time required for drying moves to the right in the figure (the one with the higher belt air permeability).
In the experimental results of high speed running (24 meters / minute or more), a minimum value of the time required for drying appears between 30,000 cubic centimeters / square centimeter · minute and 50,000 cubic centimeters / square centimeter · minute.
Also in the second embodiment (Claim 2) shown in FIG. 3, the time required for drying can be shortened as in the first embodiment (Claim 1), and the roll is increased by increasing the belt running speed. The efficiency of finishing work is further improved.

As described above, in the laundry drying mode, the air permeability of the belt, the tension of the belt, and the running speed of the belt are intricately correlated with each other. When these three physical quantities are used as variables, a laundry drying speed graph is drawn to form a four-dimensional graph.
2 and 3 described above assume a three-dimensional graph (three-dimensional graph) with the belt traveling speed as a parameter for the above-mentioned four-dimensional graph, and further, 0.15 kg / cm and 1.8 kg / cm for the belt tension. Two curves are obtained by cutting along two faces with centimeters.

Therefore, the above two graphs (two embodiments) alone are not sufficient to represent the entire technical idea created by the present inventors.
Therefore, as a result of searching for the boundary between the area of the prior art and the area of the present invention while referring to these two graphs (two embodiments), “the present invention is indispensable and It was confirmed that “the belt permeability was not less than 20,000 cubic centimeters / square centimeter · min” (Claim 3).

FIG. 4 is a schematic front view depicting an improved example of the embodiment shown in FIG.
The laundry 5 is inserted at a point A shown in the figure, rotated as indicated by an arc arrow a, and discharged at the point B shown in the figure. That is, the laundry rotation area extends from point i to the left (counterclockwise) to point ro.
A decompression chamber 10 that gently covers a part of the upper air rotation area is provided, and the air in the decompression chamber 10 is exhausted by a blower 11 to cause the air in the decompression chamber to flow.

Since the size and shape of the laundry that is the treatment object of the roll finishing machine is indefinite, the decompression chamber 10 is desirably made larger than the diameter of the heating roll 1. The term “slowly covering” is intended to provide a required space dimension W.
When air is flowing outside the belt in contact with the laundry, the steam generated from the laundry is quickly removed, and the laundry is further dried.

FIG. 5 shows an improved example different from FIG. In this example, a pressurizing chamber 12 is provided instead of the decompression chamber, and air is supplied to the pressurizing chamber by the blower 11. The supplied air flows along the outer periphery of the belt 2 holding the laundry, and promotes the drying of the laundry as in the improved example (FIG. 4).
When the present invention is carried out, a decompression chamber / pressurization chamber is configured, and by switching between intake and exhaust by the blower 11, it can be used as the improved example shown in FIG. 4 or as the improved example shown in FIG. It can be used or arbitrarily selected.

As is apparent from the above-described effects, the role of the decompression chamber 10 and the pressurization chamber 12 is to generate an air flow along the outer periphery of the belt. The final generation of negative pressure or positive pressure is It is not the purpose.
When the present invention is carried out, the improvement shown in FIGS. 4 and 5 can be achieved by generating an air flow near the outer periphery of the belt in the area where the laundry rotates without necessarily providing a decompression chamber or a pressurization chamber. The same effect as the example can be obtained.
In order to generate an air flow in the vicinity of the outer periphery of the belt, for example, various means such as providing an intake duct, providing an air nozzle, or sending wind with a fan can be considered.
However, the configuration of the decompression chamber and the blower is preferable from the viewpoint of maintaining the work environment. According to the inventor's test study, when the pressurizing chamber was provided, the same drying acceleration effect as that obtained when the decompression chamber was provided was obtained.

It is the figure which showed one Embodiment of the roll finishing machine which concerns on this invention, and attached air piping to the front view typically drawn. It is shown in order to demonstrate the principle of an operation effect of a 1st embodiment in the present invention, and is a permeability-drying time graph in belt running speed less than 24 meters / minute. It is shown in order to demonstrate the principle of an operation effect of a 2nd embodiment in the present invention, and is a permeability-drying time graph in belt running speed of 24 meters / minute or more. It is the figure which showed one improvement example of the roll finishing machine which concerns on embodiment of above-mentioned FIG. 1, and added air piping to the front view typically drawn. It is the figure which showed the improvement example different from the above of the roll finishing machine which concerns on embodiment of above-mentioned FIG. 1, and attached air piping to the front view drawn typically. It is the figure which added the air piping to the front view which showed the roll finishing machine of the prior art example, and was drawn typically.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Heating roll 2 ... Belt 3a-3d ... Roller 4 ... Unfinished laundry 5 ... Laundry 6 ... Finished laundry 7 ... Air cylinder 8 ... Pressure reducing valve 9 ... Variable pressure reducing valve 10 ... Pressure reducing chamber 11 ... Blower 12 ... Pressurizing chamber a ... Arrows representing the direction of rotation of the heating roll b, c, d, e ... Arrows representing the circumferential direction of the belt h ... Arrows representing the laundry feeding direction g ... Arrows representing the laundry feeding direction W ... Spacing dimensions B ... Laundry delivery location B ... Laundry delivery location α ... Belt tension 0.15kg / cm curve β ... Belt tension 1.8kg / cm curve γ ... Belt tension 0.15kg / cm curve δ ... Curve with belt tension of 1.8kg / cm

Claims (6)

A heating roll rotating around a horizontal axis, and an endless annular belt wound around the heating roll, and pressing the dehydrated laundry sandwiched between the heating roll and the belt In a roll finishing machine that is
The belt traveling speed is less than 24 meters / minute;
The belt has an air permeability of 20,000 cubic centimeters / square centimeter · minute to 30,000 cubic centimeters / square centimeter · minute;
The roll finisher is characterized in that the tension of the belt is 0.15 kg / cm2 to 1.8 kg / cm2. A heating roll rotating around a horizontal axis, and an endless annular belt wound around the heating roll, and pressing the dehydrated laundry sandwiched between the heating roll and the belt In a roll finishing machine that is
The belt traveling speed is 24 meters / minute or more,
The belt has an air permeability of 30,000 cubic centimeters / square centimeter · minute to 50,000 cubic centimeters / square centimeter · minute;
The roll finisher is characterized in that the tension of the belt is 0.15 kg / cm2 to 1.8 kg / cm2. The roll finisher according to claim 1 or 2 , wherein means for causing air in at least a part of a space in contact with the outer periphery of the belt to flow is provided. The roll according to claim 3 , wherein the means for causing the air to flow includes a decompression chamber provided so as to gently cover the outer periphery of the belt, and a blower for discharging the air in the decompression chamber. Finishing machine. Means allowed to flow through the air, characterized in that it comprises a blower for pumping air into the pressure chamber is provided to cover the outer periphery of the belt slowly and the pressurized chamber, according to claim 3 Roll finishing machine. A width of the belt is one belt substantially equal to a length of the heating roll;
The roll finishing machine according to any one of claims 1 to 3 , wherein the roll finishing machine includes a plurality of belts having a total width dimension substantially equal to a length dimension of the heating roll.

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