JP2003220355A - Coverage judgment device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coverage judgment device which can make judgment on whether or not the coverage of a liquid such as paste is proper. <P>SOLUTION: This coverage judgment device includes: a radiation temperature measuring means for detecting electromagnetic waves radiated from a coated surface to measure the temperature of the coated surface; and a judgment means for comparing the temperature of the coated surface with a predetermined temperature to make judgment on whether or not the coverage of the liquid on the coated surface is proper. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to printed matter, cartons, paper cups, flexible packaging materials, direct mail, envelopes,
The present invention belongs to the technical field of inspecting whether or not liquid glue discharged from a nozzle or the like is properly attached to a portion to be glued in an article before being glued.

[0002]

2. Description of the Related Art For example, in a heat insulating paper cup manufacturing apparatus, an outer surface of a paper cup of a paper cup is glued and a sleeve having a heat insulating property is attached. The adhesive is supplied by, for example, a method of ejecting (spraying) an adhesive such as an emulsion-type adhesive using water as a solvent from the nozzle onto the outer surface of the body of the rotating paper cup in the paper cup processing apparatus. By this method, the glue attached to the paper cup before the processing for sticking the sleeve becomes a strip shape extending in the rotation direction on the outer surface of the cylinder paper.

[0003]

At this time, if the amount of glue applied is small, the sticking strength of the sleeve having a heat insulating property is insufficient, and there is a problem that the sleeve peels off during the handling during or after the production. On the other hand, if the amount of glue applied is large, the glue will drop after application, or the glue of the agent will be wasted. The amount of glue applied can be adjusted by setting the applicator, but may change during application due to nozzle clogging or the like.

The present invention has been made to solve the above problems. It is an object of the present invention to provide an application amount determination device for determining whether or not the application amount of a liquid such as glue is appropriate.

[0005]

The above problems can be solved by the present invention described below. That is, the coating amount determination device according to claim 1 of the present invention measures the temperature of the coating surface by detecting the electromagnetic waves (infrared rays) radiated by the coating surface, and the temperature of the coating surface. It is provided with a judging means for judging whether or not the coating amount on the coating surface is proper by comparing with a predetermined temperature.

According to the present invention, the temperature of the coating surface is measured by the radiation temperature measuring means, and the suitability of the coating amount is judged by the judging means. It absorbs the heat of vaporization when a volatile component contained in the liquid to be coated (coating liquid), such as water, vaporizes. Therefore, the temperature of the coated surface decreases, and the amount of decrease in the temperature is related to the coating amount. That is, it is possible to estimate the coating amount or its variation by measuring the temperature of the coating surface. Therefore, the application amount determination device for determining whether or not the application amount of the liquid such as glue is appropriate is provided.

The coating amount determination device according to a second aspect of the present invention is the coating amount determination device according to the first aspect, wherein the predetermined temperature is an electromagnetic wave (infrared ray) radiated by the radiation temperature measuring means on a non-coated surface. Is the temperature of the non-application surface measured by detecting the, the determination means, when the difference between the temperature of the application surface and the temperature of the non-application surface is within a predetermined allowable range, the application amount is appropriate. When the difference is out of the predetermined allowable range, the application amount is determined to be inappropriate. According to the present invention, whether or not the application amount is appropriate is determined by whether or not the temperature difference between the application surface and the non-application surface is within the allowable range.
Therefore, stable determination is performed without being affected by changes in room temperature (environmental temperature), article temperature, coating liquid temperature, and the like.

A coating amount determination device according to a third aspect of the present invention is the coating amount determination device according to the first or second aspect, further comprising a synchronization signal output means for outputting a synchronization signal indicating a predetermined stage in the coating operation. Then, the determination means inputs the synchronization signal, extracts the temperature of a predetermined portion of the coating surface and / or the non-coating surface from the temperature measured by the radiation temperature measuring means, and based on the extracted temperature. The determination is made. According to the invention,
Even when the measurement target moves, the temperature at a predetermined location is measured in synchronization with the coating operation. Therefore, stable determination is performed without being affected by the movement of the measurement object or the coating operation.

The coating amount determination device according to claim 4 of the present invention is the coating amount determination device according to any one of claims 1 to 3 when the determination means determines that the coating amount is inappropriate. In addition, an alarm means for outputting an alarm is provided. According to the present invention, an alarm informs that the applied amount is not proper.

A coating amount determining apparatus according to a fifth aspect of the present invention is the coating amount determining apparatus according to any one of the first to fourth aspects, wherein the coating surface is a liquid coated on the outer surface of the cylinder paper of the rotated paper cup. It is the one on which the glue is applied.
According to the present invention, it is applied to a paper cup processing apparatus.

A coating amount determination device according to claim 6 of the present invention is the coating amount determination device according to any one of claims 1 to 4, wherein the coating surface is coated on the surface of a flat article to be conveyed. The surface is the surface on which the liquid glue is applied.
According to the present invention, it is applied to a flat article processing apparatus.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described. FIG. 1 shows an example of a configuration in which the coating amount determination device of the present invention is incorporated in a paper cup coating device. In FIG. 1, 1 is a radiation thermometer, 2 is a determination unit, 3 is a timing output unit, 11 is a coating nozzle, 12 is a valve, 13 is a pressure tank, and 100 is a paper cup.

The radiation thermometer 1 measures the temperature of the coating surface and the non-coating surface as a direct measurement amount in a non-contact manner in order to obtain the coating amount as an indirect measurement amount. The radiation thermometer 1 is a device that receives infrared energy emitted from the surface of an article and measures the temperature. The radiation thermometer 1 detects only infrared rays in a wavelength range of 8 to 14 μm (which is called a window of the atmosphere) without absorption of infrared energy by water vapor or carbon dioxide gas. Since the emissivity (ratio of the amount of radiation to a black body at the same temperature) varies depending on the material and surface condition of the article, it is usually used after calibration such as emissivity correction. In the present invention, stability and reproducibility are more important than absolute accuracy of measured temperature.

The determination unit 2 compares the temperature of the coating surface with a predetermined temperature to determine whether the coating amount of the coating surface is appropriate.
As the predetermined temperature, room temperature, the temperature of the non-coated surface, or the like can be applied. For example, the determination unit 2 determines that the application amount is appropriate when the difference between the temperature of the coated surface and the temperature of the non-coated surface is within the predetermined allowable range, and when the difference is outside the predetermined allowable range. It is determined that the coating amount is inappropriate. The determination unit 2 can be configured by hardware and software of a data processing device such as a microcomputer and a personal computer.

The timing output unit 3 detects the rotation of the paper cup 100 in the rotating device. The purpose of detecting the rotation is to clarify the measurement target by the radiation thermometer 1. In other words, in the temperature signal measured by the radiation thermometer 1 and continuously output, the portion of the temperature signal indicating the coating surface temperature and the portion of the temperature signal indicating the non-coating surface temperature are clarified by detecting the rotation. be able to. That is, the timing output unit 3 gives timing for sampling the coating surface temperature and the non-coating surface temperature from the temperature signal.

As the timing output section 3, a rotary encoder can be used. The count value of the pulse output from the rotary encoder after the application nozzle 11 starts ejection (spraying) (from the rise of the ejection (spraying) signal) represents the position of the application start surface of the paper cup 100. If the position of the coating start surface has not reached the measurement position in the radiation thermometer 1, the temperature signal output from the radiation thermometer 1 indicates the temperature of the non-coating surface. If the position of the coating start surface passes the measurement position in the radiation thermometer 1, the temperature signal output from the radiation thermometer 1 indicates the temperature of the coating surface. That is, the timing for sampling the temperature signal is given by comparing the above-mentioned count value with a predetermined count value.

The coating nozzle 11 is a nozzle for ejecting (spraying) the coating liquid that is pressurized and supplied in the form of fine liquid. As shown in FIG. 1, the discharged (sprayed) coating liquid spreads away from the coating nozzle 11. And
The application nozzle 11 is installed at an appropriate distance from the paper cup 100 so that a predetermined application width can be obtained on the outer surface of the paperboard of the paper cup 100.

The valve 12 is a valve for operating the supply of the coating liquid to the coating nozzle 11. The pressurized coating liquid is
When the valve 12 is "open", the valve 12 can be passed, and when the valve 12 is "closed", the valve 12 cannot be passed.
The valve 12 is operated by a controller (not shown). The pressure tank 13 stores the coating liquid and pressurizes the coating liquid. Then, the pressurized coating liquid is supplied from the pressure tank 13 to the valve 12 through the pipe.

Next, the operation of the coating amount determination device of the present invention and the coating device shown in FIG. The coating liquid supplied from the pressure tank 13 is blocked at 12 when the valve 12 is “closed”. Therefore, the coating liquid fills the pipe, the coating nozzle 11, and the valve 12, but is not discharged (sprayed) from the coating nozzle 11.

Under the command of the control device, the paper cup 100 is supplied to the mounting table of the rotating device (not shown) of the paper cup 100, and the mounting table rotates. The rotation speed stabilizes at a predetermined rotation speed after a predetermined time has elapsed. At that time, the control device outputs a command to change the valve 12 from “closed” to “open”. This output is also a trigger when the application amount determination device starts operating. Then, after a predetermined time, the valve 12 is changed from "open" to "closed".

The coating amount determination device inputs the trigger and performs a series of operations to determine the coating amount. FIG. 2 is a flow chart showing the process of the operation of the coating amount determination device for determining the coating amount. The operation of the coating amount determination device will be described with reference to FIG. First, in step S1 of FIG. 2, the determination unit 2 inputs a trigger. Moreover, after inputting the trigger, the pulse output from the timing output unit 3 is counted to obtain a pulse count value.

Next, in step S2, the radiation thermometer 1 continues to measure the temperature of the outer surface of the paperboard of the paper cup 100 and continues to output a temperature signal, and the determination unit 2 inputs the temperature signal. The determination unit 2 samples an input temperature signal and A / D (analog-to-digital) when the pulse count value reaches a predetermined value that gives a timing for sampling the temperature of the non-application surface. It is converted and stored in the memory as the non-coated surface temperature.

Further, when the above-mentioned pulse count value reaches a predetermined value that gives a timing for sampling the temperature of the coating surface, the judging section 2 samples the input temperature signal and performs A / D conversion, The temperature of the coated surface is stored in the memory.

Next, in step S3, the determination unit 2
When the difference between the temperature of the coated surface and the temperature of the non-coated surface stored in the memory is within the predetermined allowable range, it is determined that the coating amount is appropriate, and when the difference is outside the predetermined allowable range. It is determined that the coating amount is inappropriate. Judgment unit 2
Is determined to be appropriate (OK), the series of coating amount determination processing is ended, and the determination unit 2 waits for the next trigger input.

If the determination unit 2 determines that the coating amount is improper (NG), and the reason is that the coating amount is too small, then the process proceeds to step S4. In step S4, an alarm unit (not shown) inputs the determination of the determination unit 2 and outputs an alarm for an insufficient coating amount. If the determination unit 2 determines that the coating amount is improper (NG) and the reason is that the coating amount is excessive, then the process proceeds to step S5. In step S5, an alarm unit (not shown) inputs the determination of the determination unit 2 and outputs an alarm for an excessive coating amount.

When an operator or the like inputs an alarm output to release the alarm output by pressing a release button (not shown), the determination section 2 inputs the input and stops the inappropriate determination output. This stops the alarm output. Then, the determination unit 2 waits for the input of the next trigger.

Here, the relationship between the above-mentioned temperature signal and determination will be described with reference to FIG. In the graph of FIG. 3, the vertical axis represents temperature and the horizontal axis represents time. In FIG. 3, a temperature signal (measured temperature), an upper limit value, a lower limit value, timing, etc. are shown as a graph. As shown in FIG. 3, the maximum value of the temperature signal (measured temperature) is stable at 25 ° C. This indicates that the temperature of the non-coated surface of the paper cup 100 is stable at 25 ° C. That is, the room temperature is 25 ° C
That is, it indicates that the paper cup 100 is adapted to room temperature.

As is clear from this, the paper cup 1
When 00 is at room temperature, the room temperature can be measured instead of measuring the temperature of the non-coated surface, and the room temperature can be used instead of the temperature of the non-coated surface in the above steps.

Since the physical properties of paper are significantly affected by temperature and humidity, it is common to strictly control the temperature and humidity of the environment in the manufacturing process of the paper cup 100. Therefore, the maximum temperature (room temperature and non-coated surface temperature) of 25 ° C. of the paper cup 100 shown in FIG. 3 is a steady temperature that hardly changes. Further, since the humidity is also constant, the volatilization of the volatile components on the coated surface is stable, and the reproducibility of the relationship between the coating amount and the temperature drop on the coated surface is ensured.

In that case, the difference between the coated surface temperature and the non-coated surface temperature is determined only by the coated surface temperature. Therefore, in the coating amount determination device of the present invention, each paper cup 1
For 00, it is necessary to measure the temperature of the coated surface, and for the temperature of the non-coated surface, it is possible to omit the temperature measurement every time. Further, the calculation of the difference in the above steps can be omitted.

When the calculation of the difference is omitted in this way, it is not judged whether or not the difference is included in the predetermined allowable range, but the minimum value of the temperature signal (measured temperature) is included in the predetermined allowable range. It may be determined based on whether or not it is present. The upper limit value and the lower limit value shown in FIG. 3 indicate such an allowable range.

In FIG. 3, the timing for sampling the temperature of the coated surface is shown by vertical dotted lines. The time when the vertical dotted line intersects the horizontal axis of the graph, that is, the time axis is the sampling timing. This timing is determined based on the trigger and the pulse count value as described above.
Is calculated. The setting of the timing is determined by the predetermined value of the pulse count value as described above. As shown in FIG. 3, the timing is a temperature signal (measured temperature).
The setting is made so as to sample the local minimum value of or in the vicinity thereof.

Depending on whether or not the coating surface temperature sampled at such a timing is included in the upper limit value and the lower limit value shown in FIG. 3, if it is included, the determination unit 2 determines that it is appropriate (OK). It is determined that there is, and the determination unit 2 determines that it is improper (NG) when it is out. In FIG. 3, the coating surface temperature sampled first is appropriate (O
K). The coating surface temperatures sampled second and third are improper (NG). The coating surface temperatures sampled fourth and fifth are proper (OK).

The application amount determination device configured to determine the suitability of the application amount of the liquid glue applied to the outer surface of the body of the rotating paper cup 100 has been described above. The coating amount determination device of the present invention can be used by incorporating it into various types of coating devices. As another example, a coating amount determination device configured to determine the appropriateness of the coating amount of the liquid paste applied on the surface of a flat article to be conveyed will be described with reference to FIG. In FIG. 4, 4 is a radiation thermometer, 5 is a determination unit, 6 is a timing sensor, 14 is a coating nozzle, 15 is a valve, 16 is a pressure tank, 17 is a conveying device, 101a, 101b, ... Are sheets. is there.

The radiation thermometer 4, the determination unit 5, the coating nozzle 14, the valve 15, and the pressure tank 16 in FIG. 4 are respectively the radiation thermometer 1, the determination unit 2, the coating nozzle 11, and the coating nozzle 11 in FIG.
Since the valve 12 and the pressure tank 13 are basically the same, the description thereof will be omitted. Only the differences will be described.

The timing sensor 6 detects the feed amount of the conveyor belt in the conveyor 17 and outputs a pulse.
A rotary encoder can be used as the timing sensor 6. Since the conveyor belt is sent by, for example, a drive pulley, the conveyor belt is configured to detect rotation by a rotary encoder provided on the rotation shaft of the drive pulley. In such a configuration, it is basically the same as the timing device 3.

The conveying device 17 conveys the sheets 101a, 101b, ... The respective sheets 101a, 101b, ... Are conveyed at a predetermined interval. The coating device is for each sheet 101a, 1
The arrival signals output by detecting that the edges 01b, ... Have reached a predetermined position are input. Then, when it is further conveyed by a predetermined distance, the liquid glue is discharged (sprayed) from the application nozzle 14.

For the generation of such discharge (spray) timing, the same method as the method for generating the timing for detecting the coated surface and the non-coated surface by the radiation thermometer 1 described above can be applied. That is, it can be generated from the arrival signal output by the arrival detection means such as a photoelectric sensor and the count value of the pulses representing the feed amount output by the timing sensor 6.

The sheets 101a, 101b, ... Are small flat articles such as printed matter, carton blanks, direct mail, envelopes, and the like.

As shown in FIGS. 4 and 1, there is a large difference in the configuration between the coating apparatus for the sheets 101a, 101b, ... And the coating apparatus for the paper cup 100 described above. However, regarding the portion of the coating amount determination device of the present invention, the difference in the configuration is slight as described above. The operation is basically the same, and the description is omitted.

[0041]

As described above, according to the application amount determination device of the first aspect of the present invention, the application amount determination for determining whether or not the application amount of the liquid such as glue is appropriate. A device is provided. Further, according to the coating amount determination device according to the second aspect of the present invention, stable determination can be performed without being affected by variations in room temperature (environmental temperature), article temperature, coating liquid temperature, and the like. Further, according to the coating amount determination device of the third aspect of the present invention, stable determination can be performed without being affected by the movement of the measurement target or the coating operation. Further, claim 4 of the present invention
According to the coating amount determination device according to the above, it is possible to inform by an alarm that the coating amount is not appropriate. Further, the coating amount determination device according to the fifth aspect of the present invention can be applied to a paper cup processing device. Further, claim 6 of the present invention
The coating amount determination apparatus according to the present invention can be applied to a flat article processing apparatus.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a configuration in which a coating amount determination device of the present invention is incorporated in a paper cup coating device.

FIG. 2 is a flow chart showing a process of an operation of a coating amount determination device for determining a coating amount.

FIG. 3 is a diagram showing a relationship between a temperature signal and determination as a graph.

FIG. 4 is a diagram showing an example of a configuration in which the coating amount determination device of the present invention is incorporated in a sheet (flat article) coating device.

[Explanation of symbols]

1,4 radiation thermometer 2,5 Judgment section 3 Timing output section 6 Timing sensor 11,14 coating nozzle 12,15 valves 13, 16 Pressurized tank 100 paper cups 101a, 101b, ... Sheet

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3E075 AA07 BA33 BB08 CA01 DA15                       DA32 DD08 DD43 FA03 FA27                       GA01                 4F035 AA03 BA22 BB16 BC05                 4F042 AA02 AA03 AA11 BA19 BA21                       BA25 DH09

Claims (6)

[Claims] 1. A radiation temperature measuring means for measuring the temperature of the coating surface by detecting an electromagnetic wave radiated by the coating surface, and comparing the temperature of the coating surface with a predetermined temperature so that the coating amount of the coating surface is proper. An application amount determination device comprising: a determination unit that determines whether or not there is a coating amount. 2. The coating amount determination device according to claim 1,
The predetermined temperature is the temperature of the non-application surface measured by detecting the electromagnetic waves emitted by the radiation temperature measuring means non-application surface, the determination means, the temperature of the coating surface and the non-application surface The coating amount is determined to be appropriate when the difference from the temperature is within a predetermined allowable range, and the coating amount is determined to be incorrect when the difference is out of the predetermined allowable range. Coating amount determination device. 3. The coating amount determination device according to claim 1, further comprising a synchronization signal output means for outputting a synchronization signal indicating a predetermined stage in the coating operation, wherein the determination means inputs the synchronization signal, A coating amount determination device, characterized in that the temperature of a predetermined portion of the coating surface and / or the non-coating surface is extracted from the temperature measured by the radiation temperature measuring means, and determination is performed based on the extracted temperature. 4. The coating amount determination device according to claim 1, further comprising an alarm unit that outputs an alarm when the determination unit determines that the coating amount is inappropriate. Characteristic coating amount determination device. 5. The application amount determination device according to claim 1, wherein the application surface is an application surface of a liquid glue applied to the outer surface of the body of the rotating paper cup. Quantity determination device. 6. The coating amount determination device according to claim 1, wherein the coating surface is a liquid glue coating surface applied to the surface of a flat article to be conveyed. Quantity determination device.