JPH07290613A - Device for monitoring sticking-failure in corrugator - Google Patents

Abstract

PURPOSE:To prevent production of non-conforming articles and preclude articles to be damaged in the sampling inspection by increasing pressing forces, paper temperature, and the amount of glue, and decreasing the speed of the machine for enhancing the initial adhesive strength in the case where the output signal value representing the initial adhesive strength of a function software is smaller than a predetermined lower limit. CONSTITUTION:When the initial adhesive strength F1 of a calculated output signals becomes larger than the initial adhesive strength Fcr of a predetermined lower limit, F1 is recorded. In the case where F1 is lower than Fcr, an alarm is given and the signals E of pressing forces are sent to pressing rollers by a computer 30 for pressing. With regard to paper temperature and paper moisture, signals F, G, H, I are given to respective preheaters 2, 3, 12 for raising and controlling temperature. In addition, regarding to the amount of glue, it is increased by signals H, K to the glue machine, and the machine speed can be set by the computer 30 and also can be varied directly. In changing a parameter, the pressing degree, paper temperature, amount of glue, and the speed of a machine are changed by 2.5% at the same time, and if not satisfying F1>Fcr, it is changed by 10% and continued up to satisfy F1>Fcr.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for monitoring corrugator adhesion failure in a corrugated board manufacturing apparatus.

[0002]

2. Description of the Related Art A corrugated board manufacturing apparatus is a general term for a corrugator that processes a roll of raw paper to manufacture a corrugated board sheet and a printing machine that processes the corrugated board sheet into a corrugated board box.
Corrugated cardboard is a corrugated core with a liner attached to one or both sides.
There are multiple double-sided corrugated boards. The conventional corrugator will be described with reference to FIG. 5. The specifications of the corrugator include a laminating speed of 120 to 300 m / min and a sheet passing width of 1400 to 2750 m.
Wide, with a machine length of 50 to 100 m. The back liner supports the winding base paper, is unwound from the unwinding back liner mill roll stand 1, and advances to the pressure roll 3 via the preheater 2. Here, the preheater is a hot roll (internal steam heating) that preheats and regulates the liner core to achieve step molding and gelatinization of the adhesive in a short time. On the other hand, the core unwound from the mill roll stand 10 for a core passes through the preheater 9 and the upper and lower staged rolls 5 and 4 to become a waveform. Next, the glue is applied by the glue machine 6a for transferring the glue to the top of the single-sided corrugated board. The glue machine 6a
It is composed of a gluing roll 7a and a metering roll 8a for controlling the amount of glue. The back liner and the corrugated core are bonded in a short time at the nip portion (contact portion) of the pressure roll 3 and the step roll 4. The single-faced corrugated board 15 thus manufactured is sent to the next step by the bridge 14. In FIG. 5, the AA section is called a single facer. This is the main part of the first half of the corrugator, and the upper and lower stepped rolls (which have a stepped shape like a spur gear over the entire width) are used to form a step on the core, and a liner is applied with an adhesive (starch glue is common). To produce single-sided corrugated board. Next, single-sided cardboard 1
5 passes through the preheater 12 and is glued to the step top on the side opposite to the back liner of the unevenness of the core by the glue machine 6b to form the single-sided corrugated board 19.

On the other hand, the front liner unwound from the mill roll stand 11 for the front liner passes through the preheater 12,
It moves onto the heating plate 18 and is bonded to the above-mentioned glued single-sided corrugated board 19. At this time, the single-sided corrugated board 19
The back liner side is held down by a weight roll 16 that applies pressure to a part of the rotating cotton belt 17 by its own weight. The process of attaching the single-sided corrugated board 19 and the front liner is called a double facer (BB portion). The bonded corrugated cardboard sheets are cut into predetermined dimensions at a cutoff 13 at right angles to the flow direction. A servomotor is used for the drive for that purpose, and the cutting length can be changed instantaneously. Then, the cut corrugated cardboard sheets enter the stacker 20 for stacking sheets finished to have a predetermined size. Cutoff 13 and stacker 20 in FIG.
Including, the stacker section (CC section) is called.

[0004]

However, in the above-mentioned conventional corrugator machine, there was a case where the adhesion was poor on the machine immediately after the laminating operation, that is, the core and the liner were easily separated. Furthermore, even if it looks like glued on the machine,
Adhesion failure was sometimes found in the manufacturing section or the casing section where a box is made from corrugated paper. Such an adhesion failure phenomenon may occur in the entire width of the paper, and in some cases, a 1 km long corrugated board is manufactured, and an adhesion failure of about several meters to several tens of meters may occur. In any case, when such a defective adhesion is found when the product is delivered to a customer and manufactured, the entire lot will be returned, which is a very big problem for the corrugated board manufacturer. . Conventionally, the only method for detecting the adhesion failure is an off-line method such as partially extracting a sample and measuring the adhesion strength, but this is difficult to apply because it damages the product. Therefore, the present invention solves the above-mentioned conventional problems and detects and controls adhesion defects online during corrugated board production, thereby eliminating the occurrence of defective products and preventing damage to products due to sample inspection. It is intended to provide a defective monitoring device.

[0005]

Therefore, the present invention is a means for measuring the water content (moisture content) and the temperature of a paper / sheet to be bonded at the front of bonding of a single-sided corrugated board manufacturing section arranged on a corrugated board manufacturing line. And a signal monitored by means for monitoring the pressing force and amount of glue applied to the paper / sheet in each manufacturing section and the operating speed monitoring means for each manufacturing section, and a signal for doubling the size of glue and a preset signal by the paper chamber. By comparing the output signal value with the device that monitors the output signal showing the initial adhesive force of the number software that predicts the value corresponding to the adhesive force from the and the lower limit value that shows the initial adhesive force that causes adhesive failure If the output signal value is smaller than the predetermined lower limit value, control is performed to increase the initial adhesive force by increasing the pressing force, increasing the paper temperature, increasing the amount of glue, decreasing the machine speed, etc. Shall in, it is an unit for which a problem solution.

[0006]

According to the present invention, in the single facer, four water and temperature per 2 m width are measured at the point A between the preheater and the pressure roll, and the measured water and temperature are input to the computer 0. Also, at the point B between the preheater and the upper roll, four water contents and temperatures are measured per 2 m width. For the applied pressure, a strain gauge is attached to the bearing of the pressure roll, and the applied pressure is calculated and loaded into the computer. In the double facer, moisture and temperature are input at 4 positions per 2 m width between the preheater and the hot plate at positions C and D on the single-faced cardboard and the front liner, respectively.
The amount of glue can be calculated from the number of rotations of the gluing roll and the metering roll and the gap. However, since the paper temperature and the water content measured at each of the locations A, B, C, and D are different from the paper temperature and the water content at the bonding position, correction values are used. The bonding time is calculated from the structure of the bonding section and the machine speed, and the pressure applied by the double facer is calculated based on the weight of the weight roll.
Regarding moisture and temperature, a non-contact type infrared moisture meter and infrared thermometer were used. Using these measured values, paper quality (preliminarily measured permeation amount), and double water ratio (manufacturing conditions), the initial bonding adhesive force was calculated every 5 seconds. Further, the permeation amount of the paper, the water content in the paper, and the paper temperature were calculated with a single facer and a double facer, respectively, using the average values of the back liner and the core or the single-faced cardboard and the front liner.

Initial adhesive force F1 which is the calculated output signal
Is an initial adhesion force Fc which is a predetermined lower limit value that causes adhesion failure.
If r or more, there is no problem and the F1 is recorded. If F1 is less than or equal to Fcr, an alarm is issued by an alarm device (not shown), and the computer applies a signal E to the pressure roll of FIG. Regarding the paper temperature and the water content in the paper, signals of F, G, H, and I are given to the preheater to raise or adjust the temperature. The amount of glue is increased by the signals H and K to the glue machine. Furthermore, the machine speed can be set by a computer and can be directly changed. When changing these parameters, the amount of pressurization, the temperature of the paper, the amount of glue, and the machine speed are simultaneously changed by 2.5% with respect to the reference, and if F1> Fcr is not satisfied, it is changed by 10%, and F1> Repeat until Fcr is satisfied. The water content in the paper is controlled only when it has a distribution in the paper width direction and when the average water content is outside the appropriate range. Of course, if there is a limit of operating parameters, for example, the machine speed is lowered to a certain limit, and above that, other parameters are changed. The corrugated cardboard sheet manufactured when the alarm F1> Fcr is issued is removed from the stacker.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. The inventors of the present invention have manufactured a basic adhesion test device described later, and have a factor affecting the adhesion phenomenon (double ratio of glue ...
[Ratio of starch and water during production of glue], liner, core paper quality
・ [Permeability of water], moisture in paper ・ ・ [reference of liner and core that have been preliminarily conditioned for moisture], pressure, paper temperature, amount of glue, adhesion time ・ [machine speed]) as parameters , Initial adhesive strength was determined. The initial adhesive force means an adhesive force on a machine, not an adhesive force after the adhesive is adhered to the paper and drying is completed. The permeation degree of the paper was represented by cutting the target paper into strips, immersing the paper in water, and immersing it in water for one minute. FIG. 2 shows a measuring device for obtaining the initial adhesive force. Figure 2
At 2, the core test piece 21 is attached to the test piece mounting carriage 27 with a double-sided tape, and the temperature is raised to a predetermined temperature by the preheater 22. Next, after confirming that the center core test piece 21 of the test piece mounting base has reached a predetermined temperature, the liner paper 24 is attached to the test piece mounting base 28, the heater 25 is heated to a predetermined temperature, and the liner paper 24 When the temperature reaches the specified temperature, the test starts.

The test piece mounting carriage 27 operates A1 and descends to the gluing position. The mounting carriage 27 is A2
After the running, contact with the gluing roll 23, and movement to the point of adhesion (l ₁ -l ₂ ) during that time, after the open time setting time (the time from pasting to pasting in the actual machine), The test piece mount 28 rises and is bonded (A3 exercise). After the pressurizing time setting time, the test piece mounting base 28 descends, and the adhesive strength at that time is tested with the load cell 26. Paper (liner / core) with experimental equipment
Type, double water ratio (ratio of starch to water during paste production), water content in the paper (preparing a liner / core that has been moisture adjusted in advance), air pressure attached to the test piece 27. The initial adhesive force was measured by freely changing each parameter of temperature (preheaters 22 and 25 were independently changed), open time, amount of glue (adjusted by scraping plate of gluing roll), and time of adhesion (timer setting). The following empirical formulas were created for each of the seven parameters under the conditions of a single facer and a double facer.

[Equation 1] F = f ₁ (double water ratio) f ₂ (water penetration) f
₃ (water content in paper) f ₄ (pressure) f ₅ (paper temperature) f ₆ (paste amount) f ₇ (bonding time)

In the above equation, the pressing force of the double facer,
The double water ratio, the amount of glue, and the bonding time are calculated from the machine setting conditions. In addition, the water penetration is determined in advance for each paper quality,
Use that value. The pressure applied by the Sigurfacer is measured as an average value, and the water content and paper temperature in the paper are measured by placing a sensor in the paper width direction. If the initial adhesive force F1 calculated from each item is smaller than the initial adhesive force Fcr that causes adhesion failure, the pressure value, the paper temperature, the amount of glue, and the adhesive time (machine speed) are changed in this order, and the value of F is Fcr. The control is performed as described above. Fc
r is slightly different depending on the paper type. The control means measures the moisture distribution in the width direction of the paper, the paper temperature distribution in the width direction and the average pressing force of the single facer bonding portion, and further, the penetration coefficient is determined by the paper quality, and the amount of paste is set by the set condition. If the double water ratio is calculated from the conditions and the bonding time is further calculated from the operating conditions and is input to the computer, and the initial adhesive force F calculated from these values is smaller than the initial adhesive force Fcr causing adhesive failure, the applied pressure is increased. The purpose is to increase the paper temperature, increase the amount of glue, decrease the machine speed, etc., and control the initial adhesive force F to be Fcr or more.

Now, referring to FIG. 1, an application example in the case of an actual machine will be described. In comparison with the conventional corrugated board manufacturing apparatus of FIG.
As described above, a plurality of moisture meters and thermometers are arranged at positions A, B, C, and D in the width direction, and a pressurizing force measuring device E with a single facer and a computer 30 as a monitoring device are arranged. The calculation of the initial adhesive force F needs to be performed over time (usually every 5 to 10 seconds). This is to check that the distribution (water content, temperature) on the paper side and mechanical operation abnormality occur instantly. 2m at point A between preheater 2 and pressure roll 3 for single facer
Measures the water and temperature of 4 pieces per width, computer 30
Input to. Also, the preheater 9 and the upper roll 5
Four points of water and a temperature per 2 m width are measured at point B between. As for the pressing force, a strain gauge is attached to the bearing of the pressure roll 3, the pressing force is calculated, and the pressure is taken into the computer 30.

In the double facer, the single-faced corrugated board 10 and the C on the front liner are provided between the preheater 12 and the hot plate, respectively.
Input water and temperature at 4 points per 2m width at positions D and D. The amount of glue can be calculated from the number of rotations of the gluing roll and the metering roll and the gap. However, each place A, B, C, D
Since the paper temperature and the water content measured in step 2 are different from the paper temperature and the water content at the bonding position, correction values are used. In addition, the adhesion time is calculated from the weight of the weight roll, and the pressure of the double facer is calculated from the structure of the laminating section and the machine speed. Regarding moisture and temperature, a non-contact type infrared moisture meter and infrared thermometer were used. Using these measured values, paper quality (preliminarily measured permeation amount), and double water ratio (manufacturing conditions), the initial bonding adhesive force was calculated every 5 seconds. Further, the permeation amount of the paper, the water content in the paper, and the paper temperature were calculated with a single facer and a double facer, respectively, using the average values of the back liner and the core or the single-faced cardboard and the front liner.

If the calculated output signal, the initial adhesive force F1 is equal to or larger than the initial lower limit value Fcr, which is a predetermined lower limit value for causing adhesion failure, there is no problem and the F1 is recorded. If F1
Is less than Fcr, an alarm is issued by an alarm device (not shown), and the computer 30 outputs a signal E to the pressure roll to pressurize the pressing force shown in FIG. Regarding the paper temperature and the water content in the paper, F, G, H, and
I signal is given to raise the temperature or adjust the temperature. The amount of glue is increased by the signals H and K to the glue machine. The machine speed can be set by the computer 30 and can be directly changed. When changing these parameters, pressurization amount, paper temperature, gluing amount, and machine speed are changed at the same time by 2.5% with respect to the standard, and then F
If 1> Fcr is not satisfied, change by 10%, F1> Fcr
Repeat until satisfied. The water content in the paper is controlled only when it has a distribution in the paper width direction and when the average water content is outside the appropriate range. Of course, if there is a limit of operating parameters, for example, the machine speed is lowered to a certain limit, and above that, other parameters are changed. F1> F
The corrugated cardboard sheet produced while issuing the cr alarm is removed from the stacker.

Next, the control system will be described. A block diagram of this control will be described with reference to FIG. First, the temperature of the paper is measured, and the paper temperature at the bonding portion is calculated in consideration of the temperature change from the measurement point to the bonding portion. The average pressing force of the single facer takes in a signal, and the amount of glue is calculated from the speeds and intervals of the rolls with the glue roll and the metering roll. On the other hand, the water content at the bonding portion is calculated from the sensor value of the water content in the paper, taking into consideration the water content change from the measurement point to the bonding portion. Further, the pressure applied at the double facer bonding portion is calculated from the roll arrangement and the roll weight at the double facer bonding portion. Regarding the paper quality, the permeation amount data is created in advance by a standard test, and the permeation amount of a specific paper quality is input. Double water ratio is
Input directly from the manufacturing conditions. Also, the bonding time is calculated from the machine speed and the roll arrangement and roll shape for each of the single and double facers, and the initial bonding force is calculated using the above values.

Next, this initial adhesive force is compared with the required adhesive force Fr. If it is Fr or more, there is no change in the operating factor, and if it is Fr or less, the pressing force, the paper temperature, the amount of glue, and the adhesive time. Is corrected and compared with the initial adhesive force again, and if Fr or more, the amount of pressurization, the paper temperature, the amount of glue, and the adhesive time are controlled. If it is less than Fr, the correction calculation of the pressing force, the paper temperature, the amount of glue, and the bonding time is performed again.

Next, the control flow will be described with reference to FIG. In Figure 4, the paper temperature, the pressure of the single facer, and the water content in the paper are measured values, and the amount of glue is the calculated value of the operating conditions of the glue machine. The bonding time is the calculated value from the machine speed and the operating conditions. The pressurizing force was calculated from the arrangement of rolls, the paper quality was permeated from the basic test, and the double water ratio was calculated from the glue manufacturing conditions. If the initial adhesive force Fcr at the time of generating is greater than or equal to Fcr, the operation parameters are not changed. On the other hand, if the calculated F is less than Fcr, the applied pressure
Measured values of paper temperature, amount of glue, and adhesion time Po, To, No, respectively
The first time, the initial adhesive force is calculated by varying all by 2.5% (0.025) with respect to θo. If the newly calculated initial adhesive force Fn is greater than or equal to Fcr, the operating condition is changed to the calculated value Pn, Tn, Nn, θn. On the other hand, if Fn is less than or equal to Fcr, then the same calculation is repeated with a variation of 5% to satisfy Fn> Fcr. On the other hand, each unit has maximum Pmax, Tmax, Nmax, θmax,
When the calculated values of n, Tn, Nn and θn exceed the maximum value of each parameter, the maximum value is substituted.

[0017]

As described in detail above, according to the present invention, the double water ratio of the glue, which is a factor affecting the adhesion phenomenon of the paper / sheet, on-line of the corrugator during corrugated board production,
Adhesion failure can be detected by monitoring the paper quality, water content in paper, pressure, paper temperature, amount of glue, adhesion time (machine speed), and comparing it with the initial adhesion force that causes adhesion failure. Was obtained. (1) Adhesion failure can be detected by a non-contact method which has no detection means in the past. In addition, sample inspection is not required, and product damage can be prevented. (2) There are various other factors with respect to poor adhesion, but with this method troubles due to poor adhesion were drastically reduced and no defective products were generated. (3) Since the pressure, temperature, and moisture in the paper are constantly checked, misoperation can also be checked. (4) In addition, this method can handle differences in glue type and paper quality as long as basic data can be obtained. (5) If an adhesion defect is detected and an alarm is issued, a defective product having an adhesion defect can be reliably and easily removed. Further, in the present invention, when the adhesion failure is detected, the pressing force is increased, the paper temperature is increased, the amount of glue is increased, the machine speed is decreased, etc., so that the control for increasing the initial adhesion force is performed. It is also possible to effectively prevent defective adhesion.

[Brief description of drawings]

FIG. 1 is a system diagram of a control system according to an embodiment of the present invention.

FIG. 2 is a side view of an apparatus for measuring an initial adhesive force.

FIG. 3 is a block diagram of a control system of the present invention.

FIG. 4 is a control flowchart of the present invention.

FIG. 5 is a side view of a control system according to a conventional corrugator.

[Explanation of symbols]

 1 Mill Roll Stand 2 Preheater 3 Pressure Roll 4 Lower Stage Roll 5 Upper Stage Roll 6 Glue Machine 7 Gluing Roll 8 Metalling Roll 9 Preheater 10, 11 Mill Roll Stand 12 Preheater 13 Cutoff 14 Bridge 15 Single Side Corrugated Cardboard 16 Weight Roll 17 Cotton Belt 18 Hot plate 19 Single-sided cardboard with glue 20 Stacker 21 Core test piece 22 Preheater heater 23 Gluing roll 24 Liner paper 25 Heating heater 26 Load cell 27 Test piece mounting cart 28 Test piece mounting platform 30 Computer

[Procedure amendment]

[Submission date] June 21, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

Initial adhesive force F1 which is the calculated output signal
Is an initial adhesion force Fc which is a predetermined lower limit value that causes adhesion failure.
If r or more, there is no problem and the F1 is recorded. If F1 is less than or equal to Fcr, an alarm is issued by an alarm device (not shown), and the computer applies a signal E to the pressure roll of FIG. Regarding the paper temperature and the water content in the paper, signals of F, G, H, and I are given to the preheater to raise or adjust the temperature. The amount of glue is increased by the signals H and K to the glue machine. Furthermore, the machine speed can be set by a computer and can be directly changed. When changing these parameters, the amount of pressurization, the temperature of the paper, the amount of glue, and the machine speed are simultaneously changed by 2.5% with respect to the reference, and if F1> Fcr is not satisfied , 5.0%, 7 0.5%, 10% and 2.5%
Varied in pitch, repeat until you are satisfied with the F1> Fcr. The water content in the paper is controlled only when it has a distribution in the paper width direction and when the average water content is outside the appropriate range. Of course, if there is a limit of operating parameters, for example, the machine speed is lowered to a certain limit, and above that, other parameters are changed. The corrugated cardboard sheet manufactured when the alarm F1> Fcr is issued is removed from the stacker.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

If the calculated output signal, the initial adhesive force F1 is equal to or larger than the initial lower limit value Fcr, which is a predetermined lower limit value for causing adhesion failure, there is no problem and the F1 is recorded. If F1
Is less than Fcr, an alarm is issued by an alarm device (not shown), and the computer 30 outputs a signal E to the pressure roll to pressurize the pressing force shown in FIG. Regarding the paper temperature and the water content in the paper, F, G, H, and
I signal is given to raise the temperature or adjust the temperature. The amount of glue is increased by the signals H and K to the glue machine. The machine speed can be set by the computer 30 and can be directly changed. When changing these parameters, pressurization amount, paper temperature, gluing amount, and machine speed are changed at the same time by 2.5% with respect to the standard, and then F
If 1> Fcr is not satisfied , 5.0%, 7.5%, 10
% And 2.5% pitch, and repeat until F1> Fcr is satisfied. The water content in the paper is controlled only when it has a distribution in the paper width direction and when the average water content is outside the appropriate range. Of course, if there is a limit of operating parameters, for example, the machine speed is lowered to a certain limit, and above that, other parameters are changed. The corrugated cardboard sheet manufactured when the alarm F1> Fcr is issued is removed from the stacker.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Takenaka 5007 Itozaki-cho, Mihara-shi, Hiroshima Mitsubishi Heavy Industries Ltd. Mihara Works

Claims (1)

[Claims] 1. A means for measuring the water content (moisture content) and temperature of a target paper / sheet to be bonded at the front of bonding of a single-sided corrugated board manufacturing section arranged in a corrugated board manufacturing line, and the paper / sheet at each manufacturing section. Prediction calculation of the value corresponding to the adhesive force from the signals monitored by the applied pressure and glue amount monitoring means and the operating speed monitoring means of each manufacturing department, and the preset signal based on the glue double ratio and paper quality By means of a device for monitoring the output signal indicating the initial adhesive force of the software, and comparing the output signal value with a predetermined lower limit value indicating the initial adhesive force that causes adhesive failure,
If the output signal value is smaller than a predetermined lower limit value, the corrugator is controlled so as to increase the pressing force, increase the paper temperature, increase the amount of glue, decrease the machine speed, etc. to increase the initial adhesive force. Adhesion failure monitoring device.