JP2010105772A - Device and method for detecting paper joined part of corrugator and corrugator with paper joined part removing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately detect a paper joined part without sticking a member to be detected in a corrugator. <P>SOLUTION: This device for detecting the paper joined part of corrugated board base paper in the corrugator includes: a non-contact thickness sensor 40 installed in a manufacturing line of the corrugator to detect thickness information on passing corrugated board base paper or a workpiece 24 of the corrugated board base paper by non-contact; and a deciding device 50A for deciding as the paper joined part, a portion where predetermined detection information is obtained from detection information of the non-contact thickness sensor 40. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  INDUSTRIAL APPLICABILITY The present invention relates to a corrugator paper splice detection apparatus and method, and a paper splice detection suitable for use in a corrugator for producing corrugated cardboard to detect and remove a splice portion of a corrugated base paper from a corrugator production line. The present invention relates to a corrugator with a paper joint removing device using the apparatus.

In a corrugator that manufactures a corrugated cardboard by bonding a paperboard (liner) and a corrugated core paper (core), it is necessary to detect the paper splice to remove the paper splice as a defective product. At present, in order to detect the paper splicing portion, a metal material (aluminum foil) is pasted on the paper splicing portion, and then the metal material is detected by a metal sensor to identify the paper splicing portion.
For example, FIG. 10 is a configuration diagram illustrating a paper splice detection technique using a conventional metal sensor in a corrugator having a general configuration. In FIG. 10, the process for processing the liner and the core corrugated cardboard is shown separately from the apparatus configuration above the apparatus configuration. As shown in FIG. 10, the corrugator includes a single facer 11, a glue machine 12, a double facer 13, a slitter scorer 14, a cutoff 15, and a stacker 16 from the upstream.

  In the single facer 11, a single-sided cardboard 24 is manufactured by laminating a liner 21 to a core 23 obtained by processing a core paper 22 into a wave shape. In the glue machine 12, the single-sided cardboard 24 manufactured by the single facer 11 is heated by the pre-heater rollers 17a and 17b and glued to the stepped mountain 23a of the core 23 of the single-sided cardboard 24, and the liner 25 is heated by the pre-heater roller 17c. To do. In the double facer 13, the single-sided cardboard 24 and the liner 25 supplied through the glue machine 12 are bonded together while being pressurized and heated to produce a double-sided cardboard 26. The double-sided cardboard 26 is cut in the sheet feeding direction by the slitter scorer 14 and cut into double-sided cardboard sheets (corrugated cardboard cut sheets) 27a and 27b by the cut-off 15, and the double-sided cardboard sheets 27a and 27b are cut. Is loaded on the stacker 16.

Metal sensors 31 a to 31 e are respectively installed immediately downstream of the single facer 11 and immediately upstream of the glue machine 12 in order to detect the spliced portions such as the liners 21 and 25 and the core paper 22. . The reason why the metal sensors 31a to 31e are installed at each of such locations is as follows.
That is, the position of the splicing unit can be calculated from the splicing time and the production speed / paper feed amount, but as shown in FIG. 10, the single-sided cardboard 24 manufactured by the single facer 11 is used. Has a structure in which a large amount stays in the bridge portion 18 before being supplied to the glue machine 12, and in the bridge portion 18, a slight error occurs in the stay amount due to the elongation of paper or the like.

  Therefore, in order to reliably remove the paper splicing portion in the final process, it is necessary to detect the paper splicing portion at least at the rear outlet of the bridge and correct the error. Therefore, metal sensors 31 c to 31 e are installed immediately upstream of the glue machine 12. Usually, in order to grasp and track the production status of the entire paper, it is necessary to detect the paper splice at the upstream entrance of the bridge. Therefore, metal sensors 31 a and 31 b are also installed immediately downstream of the single facer 11.

  By the way, the paper splicing portion containing such a metal material is usually removed by a defective portion removing device, but if it is mixed in a final product such as a cardboard box, a malfunction may occur. In the case of food or cosmetics, metal sensors may be used for inspection, and even if there is no abnormality in the food or cosmetics packed in the cardboard box, if the metal material remains in the cardboard box itself, the metal sensor Reacts to serious product claims.

  On the other hand, in recent years, as the speed of corrugators has been increased, recycled paper that has been recycled from corrugated cardboard has been mainly used, and corrugated sheets are mainly recycled as recycled materials. If the base paper contains impurities, the splice detection device may malfunction, or the metal material that should be detected in the splice part cannot be detected. Cannot be recycled while attached. For this reason, the operation | work which peels a metal material is needed and becomes a work burden.

In addition, since the corrugated cardboard sheet of the defective portion to which the metal material as the member to be detected is stuck cannot be recycled as it is, it has been incinerated.
For this reason, a technique has been proposed in which a detected member made of a colored tape such as an ink jet or black tape is attached to a corrugated cardboard instead of a metal material for detecting a paper splice. However, since these detected members are not detected unless they are pasted on the surface of the corrugated cardboard, the operator needs to check the front and back of the corrugated cardboard when printing or pasting these detected members, which is extremely laborious. It becomes a work burden. In addition, the ink jet needs to be installed with an ink jet printing machine, and there is a problem that the equipment cost for the ink jet increases.

Therefore, in the technique described in Patent Document 1, when a sheet is spliced, a colored member to be detected is attached to the corrugated cardboard production line so as to protrude upstream and downstream in the web running direction from the splicing section. The protruding portion on either the downstream side or the downstream side can be detected by a detector so as to eliminate detection failure of the detected member and malfunction during detection.
JP 2001-138414 A

However, in the technique of Patent Document 1, it is necessary to affix a colored member to be detected so as to protrude upstream and downstream in the web traveling direction from the paper splicing part at the time of paper splicing. It takes.
In addition, since the corrugated cardboard travels at a high speed of 400 m / min or more in the production line, as in the technique disclosed in Patent Document 1, the detected object protrudes downstream in the web travel direction from the joint portion of the old and new corrugated cardboard. The protruding portion of the member may be bent upstream due to air resistance, or the protruding portion may be bent or wrinkled due to the flapping of the corrugated base paper. For this reason, there is a possibility that the detected member cannot be detected by the detector, or that the detector malfunctions.

  The present invention has been devised in view of such problems, and in a corrugator, it is possible to accurately detect a paper splicing portion without attaching a detected member such as a metal material or a colored tape. Corrugator paper splice detection device and method, corrugator paper splice detection device and method, and corrugator with paper splice removal device capable of reliably removing the paper splice from the production line The purpose is to provide.

  In order to achieve the above goal, the corrugator paper splice detection device of the present invention (Claim 1) is a device for detecting a paper splice portion of a corrugated cardboard in the corrugator, and is installed in the corrugator production line. A non-contact thickness sensor for detecting the thickness information of the corrugated base paper passing through or the processed product of the corrugated base paper in a non-contact manner, and a position where specific detection information is obtained from the detection information of the non-contact thickness sensor And a determination device that determines a paper splicing portion.

The paper splicing section is preferably a capacitance-type non-contact thickness sensor (Claim 2).
It is preferable that the non-contact thickness sensor is spliced by a double-sided tape for splicing.
In this case, it is preferable that a moisture applying device is provided upstream of the non-contact thickness sensor so as to apply moisture to the portion where the double-sided tape for front joining of the paper joining portion is attached. 4).

It is preferable that the determination device determines, as the paper splicing portion, a portion where a detection value of the non-contact thickness sensor sequentially obtained according to the travel of the corrugated base paper or the processed product of the corrugated base paper has changed by a predetermined amount or more. (Claim 5).
The determination device calculates a moving average of detection values of the non-contact thickness sensor sequentially obtained according to the running of the corrugated base paper or the processed corrugated base paper, and the moving average has changed by a predetermined amount or more. Is preferably determined as the paper splicing portion (claim 6).

  The paper splicing part is spliced by partially sticking a double-sided tape for paper splicing to a predetermined portion in the paper width direction, and the non-contact thickness sensor is used for the corrugated base paper or a processed product of the corrugated base paper. At the same position in the running direction, the first sensor installed at the position in the paper width direction to which the double-sided tape for paper splicing can be pasted, and the position in the paper width direction at which the double-sided tape for paper splicing cannot be pasted And a second sensor, wherein the determination device calculates a deviation between the detection values of the first sensor and the second sensor, and determines that the deviation is a predetermined amount or more as the paper splicing portion. (Claim 7).

  Further, a corrugator with a paper splicing part removing device according to the present invention (Claim 8) is a corrugator equipped with the corrugator paper splicing part detecting device according to any one of Claims 1 to 7, and is manufactured in a double facer. The corrugated cardboard cutting sheet including the paper splicing part detected by the paper splicing part detection device of the corrugator is identified downstream of the cutting process for cutting the corrugated cardboard into a corrugated cardboard cutting sheet and before the stacker. It is characterized by having a removing device that removes it so as not to be loaded.

  The corrugator paper splice detection method according to the present invention (Claim 9) is a method of detecting a paper splice portion of a corrugated base paper in the corrugator, wherein the corrugator base paper or the corrugated base paper passes through the corrugator production line. It has a detection step of detecting the thickness information of a workpiece in a non-contact manner, and a determination step of determining a location where specific detection information is obtained from the detection information obtained by the detection step as the paper splicing portion. .

In the detection step, it is preferable to detect the thickness information using a capacitance-type non-contact thickness sensor.
The paper splicing portion is spliced by a double-sided tape for paper splicing, and in the detecting step, the terminal end portion of the first corrugated paper base sheet, the start end portion of the first corrugated paper base paper, and the paper splicing portion in the paper splicing portion. It is preferable to detect thickness information obtained by polymerization with the double-sided tape.

Before the thickness information is detected by the detecting step, it is preferable to further include a moisture applying step for applying moisture to the portion where the double-sided tape for front joining of the paper joining portion is attached. 12).
In the determination step, it is preferable to determine, as the paper splicing portion, a portion where the detection value sequentially detected by the detection step changes by a predetermined amount or more according to the travel of the corrugated base paper or the processed corrugated base paper. Item 13).

In the determination step, a moving average of the detection values sequentially detected by the detection step according to the travel of the corrugated base paper or the processed product of the corrugated base paper is calculated, and the location where the moving average has changed by a predetermined amount or more is calculated. It is preferable to determine that it is a paper splice (claim 14).
The paper splicing part is spliced by affixing a double-sided tape for paper splicing to a predetermined portion in the paper width direction, and in the detection step, the traveling direction of the corrugated base paper or the corrugated base paper processed product is the same. Position, the first thickness information at the position in the paper width direction where the double-sided tape for paper splicing can be pasted, and the second thickness information at the position in the paper width direction where the double-sided tape for paper splicing cannot be pasted In the determination step, a portion where the deviation between the value of the first thickness information detected by the detection step and the value of the second thickness information is a predetermined amount or more is determined. It is preferable to determine the joint portion (claim 15).

  According to the corrugator paper splice detection device (Claim 1) and the method (Claim 9) of the present invention, the thickness information of the corrugated base paper passing through the corrugator production line or the processed product of the corrugated base paper is contactless. Detecting and detecting a specific part from this detection information, that is, a part where the detection information indicating that the thickness is larger than a normal part (part which is not a paper joint part) is determined as a paper joint part. There is no adverse effect on the corrugated cardboard product since the sensor does not contact the corrugated cardboard paper or the processed product of the corrugated cardboard paper without attaching a member to be detected such as a material or colored tape. Therefore, no auxiliary material such as a detected member for detection is required, the running cost for detecting the paper splicing portion can be reduced, and the labor for attaching the detected member can be saved, so that the labor of the operator can be reduced. The disposal of the detected member, which is necessary in the case of the detected member made of a metal material, is also unnecessary.

  If a capacitance-type non-contact thickness sensor that detects thickness information from capacitance is used as the non-contact thickness sensor, a sensor is provided only on one side of the corrugated cardboard or a processed product of the corrugated cardboard. The location where the electrostatic capacity changes can be determined as the paper splicing portion, so that a simple device configuration is obtained, which is advantageous in terms of equipment cost and maintenance of the device (claims 2 and 10).

When the paper splicing portion is spliced by the double-sided tape for paper splicing, the thickness of the paper splicing portion is larger than that of other portions, so that the determination accuracy of the paper splicing portion is improved. 11).
If moisture is applied to the location where the double-sided tape for splicing of the paper splicing portion is pasted upstream of the non-contact thickness sensor, the capacitance of the paper splicing portion changes significantly. If the contact thickness sensor is used, the paper splice can be determined with higher accuracy (claims 4 and 12).

Easily determine the spliced part by determining the part where the detection value of the non-contact thickness sensor, which is obtained sequentially according to the running of the corrugated cardboard or the processed corrugated cardboard paper, changes more than a predetermined amount as the spliced part (Claims 5 and 13).
Corrugated cardboard or a corrugated cardboard processed product may have a corrugated core. For this reason, the detection value of the non-contact thickness sensor obtained sequentially according to the running of the corrugated cardboard or corrugated cardboard processed product is the core. However, by calculating the moving average of the detection values of the non-contact thickness sensor and determining that the moving average has changed by a predetermined amount or more as a paper splice, there is no problem. A determination can be made (claims 6 and 14).

  In addition, the double-sided tape for paper splicing is partially affixed to a predetermined part in the paper width direction of the paper splicing section, and the non-contact thickness sensor is positioned at the same position in the running direction of the corrugated cardboard or the processed cardboard base paper. In the paper width direction where the double-sided tape for paper splicing can be pasted and the position in the paper width direction where the double-sided tape for paper splicing cannot be pasted, and the deviation of the thickness information values detected at both positions Is determined to be a paper splicing portion, the paper splicing portion can be determined from the instantaneous thickness information (claims 7 and 15).

  According to the corrugator with a paper splicing portion removing device of the present invention (Claim 8), the corrugated cardboard cutting sheet including the paper splicing portion can be reliably removed, and the paper splicing to the corrugated cardboard cutting sheet loaded on the stacker is possible. It is possible to reliably prevent mixing of the parts.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
1 to 4 are views for explaining a corrugator paper splice removing device and a corrugator according to the first embodiment of the present invention, and the description will be given based on these drawings.

(Corrugator)
First, the corrugator according to the present embodiment has a general configuration similar to that described with reference to FIG. 10 in the background art section, and as shown in FIG. A single facer 11, a glue machine 12, a double facer 13, a slitter scorer 14, a cutoff 15, and a stacker 16 are configured.

In the single facer 11, a single-sided cardboard 24 is manufactured by laminating a liner 21 to a core 23 obtained by processing a core paper 22 into a wave shape. Here, the single-sided cardboard 24 manufactured by the single facer 11 has a structure in which a large amount of the cardboard 24 stays in the bridge portion 18 before being supplied to the glue machine 12.
In the glue machine 12, the single-sided cardboard 24 manufactured by the single facer 11 is heated by the pre-heater rollers 17a and 17b and glued to the stepped mountain 23a of the core 23 of the single-sided cardboard 24, and the liner 25 is heated by the pre-heater roller 17c. To do. In the double facer 13, the single-sided cardboard 24 and the liner 25 supplied through the glue machine 12 are bonded together while being pressurized and heated to produce a double-sided cardboard 26.

  The double-sided cardboard 26 is cut in the sheet feeding direction by the slitter scorer 14 and cut into double-sided cardboard sheets (corrugated cardboard cut sheets) 27a and 27b by the cut-off 15, and the double-sided cardboard sheets 27a and 27b are cut. Is loaded on the stacker 16. Further, a defective portion removing device 19 for removing the double-sided cardboard sheets 27 a and 27 b including the paper splicing portion so as not to advance to the stacker 16 is provided immediately downstream of the cut-off 15.

  In order to detect the spliced portions such as the liners 21 and 25 and the core paper 22, the corrugator production line includes a downstream of the single facer 11 and an upstream of the preheater rollers 17 a to 17 c of the glue machine 12. In addition, capacitance type non-contact thickness sensors 40a to 40e according to the present embodiment are respectively installed.

Capacitance-type non-contact thickness sensors 40c to 40e installed immediately upstream of the preheater rollers 17a to 17c of the glue machine 12 cause a slight error in the staying amount at the bridge portion 18 due to the elongation of the paper or the like. Therefore, in order to reliably remove the paper splicing portion in the final process, it is necessary to detect the paper splicing portion at least at the rear outlet from the bridge. Therefore, it is arranged in this way. The defective portion removing device 19 has detected that the double-sided corrugated cardboard sheets 27a and 27b including the paper splice portions have passed the cut-off 15 based on the detection information of the paper splice portions from the capacitance type non-contact thickness sensors 40c to 40e. Remove at time.
Further, in order to grasp and track the production status of the entire paper, it is necessary to detect the paper splice at the upstream entrance of the bridge portion 18, so that the capacitance type non-contact thickness is also provided immediately downstream of the single facer 11. Sensors 40a and 40b are installed.

(Paper joint removal device)
Next, the paper splicing portion removing apparatus according to the present embodiment will be described. As shown in FIG. 1A, the paper splicing portion 20 is a former liner as a preceding old corrugated base paper (first corrugated base paper). The end portion of 21a and the starting end portion of a new liner 21b as a new side corrugated base paper (second corrugated base paper) are polymerized with a double-sided tape 30 interposed therebetween and bonded together. . 1A and 3, the spliced portion 20 of a single-sided corrugated cardboard (a processed product of corrugated cardboard) 24 produced by bonding the liner 21 to the core 23 in the single facer 11 shown in FIG. 2 is detected. An example is shown. In the case of the back liner, the paper splicing portion 20 without the core 23 is detected.

The capacitance-type non-contact thickness sensor 40 is disposed on the liner 21 side of the single-sided cardboard 24, and the detection unit 41 is directed in a direction perpendicular to the surface of the liner 21. It is arranged so as to be separated from the surface by a predetermined distance d (see FIG. 3).
The capacitance type non-contact thickness sensor 40 corresponds to the sensors 40 c and 40 d immediately upstream of the pre-heater rollers 17 a and 17 b of the glue machine 12 or the sensors 40 a and 40 b immediately downstream of the single facer 11. On the other hand, the sensor 40e immediately upstream of the pre-heater rollers 17a and 17b of the glue machine 12 detects the paper splicing portion 20 without the core 23.

The capacitance-type non-contact thickness sensor 40 detects and outputs the capacitance C of the detection target (here, the single-sided cardboard 24). The detection target capacitance C is detected by the detection unit 41. The relationship between the facing area S with the object, the distance d between the detection unit 41 and the detection object, and the dielectric constant ε of the detection object has the following relationship.
C = ε · S / d
Here, the facing area S is constant and the distance d is also substantially constant, but the dielectric constant ε to be detected is different between the paper splicing portion 20 where the overlapping portion is on the corrugated cardboard and the other portion (normal portion). . That is, the dielectric constant ε of the paper corresponds to the amount of moisture contained in the paper. Therefore, if the moisture content per unit volume of the paper is uniform, the amount of moisture contained in the paper increases as the thickness increases, and the dielectric constant ε increases. Since the old and new liners 21a and 21b are polymerized, the paper splicing portion 20 is thicker than other portions (normal portions), and a double-sided tape 30 is also interposed between the liners 21a and 21b. 30 moisture also increases the dielectric constant ε.

From this principle, the capacitance C detected and output by the capacitance-type non-contact thickness sensor 40 changes (increases) for a predetermined period (the time during which the paper splicing portion 20 passes the sensor 40). .
That is, as shown in FIGS. 1A and 3, the single-sided cardboard 24 travels as indicated by the arrow A in the detection area of the capacitance-type non-contact thickness sensor 40, so that the capacitance-type non-contact As shown in FIG. 4, the detection value (capacitance) C detected by the thickness sensor 40 changes in accordance with the measurement position (position in the traveling direction) of the single-sided cardboard 24.

  As shown in FIG. 4, when the detected value C of the capacitance-type non-contact thickness sensor 40 periodically fluctuates vertically and finely when the paper splicing portion 20 enters the detection area of the sensor 40, the detection of the sensor 40 is performed. The value increases more rapidly than the value immediately before that, that is, the detected value of the portion of the single-sided cardboard 24 (the region of the liner 21a) including the end portion of the old liner 21a adjacent to the splicing portion 20. Thereafter, when the portion of the single-sided cardboard 24 including the purple end portion of the new liner 21b adjacent to the splicing portion 20 (liner 21b region) enters the detection region of the sensor 40, the detection value of the sensor 40 decreases rapidly. .

  The reason why the detection value C fluctuates periodically in the vertical direction is that the distance d fluctuates as the core 23 of the single-sided cardboard 24 approaches or moves away from the sensor 40. Further, in the paper splicing portion 20, the new liner 21b is stuck on the old liner 21a with the double-sided tape 30 removed, so that in the paper splicing portion 20, the region of the liner 21b is more than the region of the liner 21a. However, the distance d varies depending on the thickness of the old liner 21a and the double-sided tape 30, and therefore the level of the detection value C differs between the liner 21a region and the liner 21b region.

  However, in the paper splicing portion 20, as described above, the dielectric constant ε increases because two sheets of paper overlap each other, and the dielectric constant ε increases because the moisture of the double-sided tape 30 is also added thereto. As a result, the dielectric constant ε is significantly increased, and the detected value of the paper splicing portion 20 changes more greatly than the fine fluctuation caused by the core 23. Accordingly, the splicing portion 20 can be detected even if the detection value of the sensor 40 is used as it is. However, in this apparatus, a fine fluctuation component due to the core 23 is obtained by taking a moving average of the detection values of the sensor 40. And the change of the detected value at the paper splicing portion 20 is more clearly captured by determining the paper splicing portion 20 based on the moving average.

A determination device 50A is provided for such determination. A detection signal from the capacitance-type non-contact thickness sensor 40 is input to the determination device 50A. In addition, the determination device 50 </ b> A includes a calculation unit 51 and a determination unit 52.
The arithmetic unit 51 calculates a moving average C _AV of the detection signal from the capacitance-type non-contact thickness sensor 40 at a predetermined period T1. The moving average in this case is for suppressing fine fluctuations due to the core 23, and the time required for the moving average (that is, the time constant of the “moving average filter (low-pass filter)”) is the density of the stepped mountains of the core 23. And a value that can suppress the fine fluctuations according to the speed of the single-sided cardboard 24. Similarly, the calculation cycle T1 may be determined according to the density of the stepped mountain of the core 23 and the moving speed of the single-sided cardboard 24.

The decision unit 52, while calculating the variation amount [Delta] C _AV moving average C _AV of the value of the detection signal calculated by the arithmetic unit 51 at a predetermined period T1, the amount of change [Delta] C _AV with a preset threshold value [Delta] C _S And the change amount ΔC _AV is determined to be the paper splicing portion 20 when the change amount ΔC _AV becomes larger than the threshold value ΔC _S.
The amount of change ΔC _AV (n) is determined by the difference between the current moving average C _AV (n) and the moving average C _AV (n−1) obtained in the previous calculation cycle (= | C _AV (n) −C _AV (n−1) |), but here, the change amount ΔC _AV (n) is defined as the current moving average C _AV (n) and the moving average C _AV before the current time by a predetermined number of cycles k. (n-k) the difference between _{(= | C AV (n)} -C AV (n-k) |) to be.

And a moving average C _{AV (n)} and the immediately preceding moving average C _AV obtained by the calculation cycle of the current _(n-1), the web splicing unit 20 may not cause a large difference in the moving average C _AV and passes In some cases, the moving average C _AV (n) at the present time and the moving average C _AV (n−k) before the current time by the predetermined number of cycles k are the moving average C C when the paper splicing section 20 passes. _A big difference arises in _AV . Therefore, with each other to set the amount of change [Delta] C _AV as described above.

  When the determination unit 52 determines the paper splicing portion 20, this determination signal is sent to the defective portion removing device 19. When the defective portion removing device 19 receives the determination signal, the double-sided cardboard including the paper splicing portion 20 is received. When the sheets 27a and 27b are discharged from the cut-off 15, they are removed so as not to go into the stacker 16 because they are mixed with non-defective products.

(Function, effect)
Since the paper splicing part detection device and the corrugator according to the first embodiment of the present invention are configured as described above, the paper splicing part 20 can be detected, for example, as shown in FIG. .

That is, when the capacitance-type non-contact thickness sensor 40 installed in the corrugator production line detects the capacitance C of the single-sided cardboard 24 to be detected (step S10; detection step), the calculation unit of the determination device 50A in 51 performs processing for calculating a moving average _{C AV} of the capacitance C (step S20; moving average processing step).
Further, the calculation unit 51 changes the moving average value ΔC _AV (n), which is the difference between the current moving average C _AV (n) and the moving average C _AV (n−k) before the current time by a predetermined number of cycles k. ) And the determination unit 52 of the determination device 50A determines whether or not the change amount ΔC _AV (n) is larger than the threshold value ΔC _S (step S30; determination step).

Here, when the change amount ΔC _AV (n) is larger than the threshold value ΔC _S , it is determined that the portion that has passed the sensor 40 is the splicing portion 20 (step S40). This determination signal is sent to the defective portion removing device 19, and the defective portion removing device 19 removes the double-sided cardboard sheets 27 a and 27 b including the paper splicing portion 20.
In this way, the paper splicing portion 20 can be determined without attaching a detected member such as a metal material or a colored tape as in the prior art. This running cost can be reduced, and the labor of attaching the member to be detected can be saved, so that the labor of the operator can be reduced. The disposal of the detected member, which is necessary in the case of the detected member made of a metal material, is also unnecessary.

In particular, since a capacitance-type non-contact thickness sensor that detects thickness information from the capacitance is used, the sensor 40 is provided only on one side of the single-sided cardboard 24 (corrugated cardboard or a processed product of the corrugated cardboard). Thus, the portion where the electrostatic capacity changes can be determined as the paper splicing portion 20, and a simple device configuration is obtained, which is advantageous in terms of equipment cost and maintenance of the device.
Furthermore, in the case of the present embodiment, the paper splicing section 20 is spliced by the double splicing tape for paper splicing, as in the configuration of many paper splicing sections. Since the capacitance C, which is the value of the thickness information, changes more greatly, there is an effect that the determination accuracy of the paper splicing portion is improved.

A portion where the change amount ΔC _AV (n) of the moving average C _AV (n) of the detection value (capacitance C) of the capacitance type non-contact thickness sensor 40 is changed by a predetermined amount or more is determined as the paper splicing portion. In other words, the moving average C _AV (n) of the detection values of the sensor 40 is calculated, and the portion where the moving average C _AV (n) has changed by a predetermined amount or more is determined as the paper splicing portion. In addition, it is possible to reliably determine the paper splicing portion. In particular, even if the detection value of the sensor 40 changes according to the shape of the center core by the moving average process, the influence on the determination of the change can be suppressed, and the determination can be made without any trouble.

[Second Embodiment]
FIGS. 5 and 6 are views for explaining a corrugator paper splice removing device and a corrugator according to a second embodiment of the present invention, which will be described based on these drawings.

(Constitution)
In the present embodiment, a general corrugator (see FIG. 2) is used in the same manner as in the first embodiment, and a description thereof will be omitted.
In the case of the present embodiment, as shown in FIG. 5 (a), the paper splicing portion 20 is formed so as to partially affix the paper splicing double-sided tape 31, 31 at a predetermined portion in the paper width direction. Capacitance type non-contact thickness sensors 41, 42 are provided at two locations at the same position in the running direction of single-sided corrugated cardboard (corrugated cardboard or processed product of corrugated cardboard) 24. That is, one capacitance-type non-contact thickness sensor 41 is disposed at a position in the paper width direction where the double-sided tape 31 for paper splicing is affixed, and the other capacitance-type non-contact thickness sensor 42 is a paper splice. It is arrange | positioned in the position of the paper width direction where the double-sided adhesive tape 31 cannot be affixed.

The detection signals of these capacitance-type non-contact thickness sensors 41 and 42 are input to the determination device 50B, and the determination device 50B also includes a calculation unit 51 and a determination unit 52. .
The calculation unit 51 calculates the difference ΔCC (= | C2−C1 |) between the detection signals (capacitances) C1 and C2 of the capacitance type non-contact thickness sensors 41 and 42, and the determination unit 52 calculates the difference. ΔCC is compared with a preset threshold value ΔC0, and if the difference ΔCC exceeds the threshold value ΔC0, it is determined that the paper splicing portion 20 is present.

  As described above, the difference ΔCC between the two sensors 41 and 42 calculated by the calculation unit 51 is attached with the double-sided tape 31 for paper splicing at the paper splicing portion 20 as shown in FIG. The detection signal (indicated by a broken line) of the capacitance-type non-contact thickness sensor 41 at the paper width direction position is a capacitance-type non-contact thickness at the paper width direction position of the portion 32 where the double-sided tape 31 for paper splicing is not attached. Since the detection signal (indicated by the solid line) of the length sensor 42 changes significantly by the amount corresponding to the thickness of the double-sided tape 31 for paper splicing and the glue moisture at the adhesive portion of the double-sided tape 31 for paper splicing, FIG. As shown in b), the difference ΔCC is substantially 0 except for the paper splicing portion 20, but becomes a large value of a certain value or more at the paper splicing portion 20.

It is not necessary if the change in detection signal (capacitance) for the double-sided tape 31 for paper splicing is greater than the fine detection value fluctuation due to the core 23, but if the fine detection value fluctuation due to the core 23 cannot be ignored, As in the first embodiment, it is preferable to take a moving average of the detection values of the sensors 41 and 42 and determine the splicing portion 20 based on this moving average.
In this embodiment, the calculating unit 51 calculates the moving average of the difference ΔCC, and the determining unit 52 determines the splicing unit 20 based on the moving average.

(Function, effect)
Since the paper splice detection device and corrugator according to the second embodiment of the present invention are configured as described above, the paper splice 20 can be detected, for example, as shown in FIG. .
That is, the capacitance-type non-contact thickness sensors 41 and 42 installed in the corrugator production line detect the capacitances C1 and C2 at the respective positions of the single-sided cardboard 24 to be detected (steps S12 and S14; detection). Step), the calculation unit 51 of the determination device 50B performs a process of calculating the moving averages C1 _AV and C2 _AV of the capacitances C1 and C2 (steps S22 and S24; moving average processing step).

Further, the calculation unit 51 calculates a deviation ΔCC of each moving average C1 _AV and C2 _AV , and the determination unit 52 of the determination device 50A determines whether or not the deviation ΔCC is larger than the threshold value ΔC0 (step S32; determination) Step).
Here, when the deviation ΔCC is larger than the threshold value ΔC0, it is determined that the portion that has passed the sensors 41 and 42 is the paper splicing portion 20 (step S42). This determination signal is sent to the defective portion removing device 19, and the defective portion removing device 19 removes the double-sided cardboard sheets 27 a and 27 b including the paper splicing portion 20.

In this way, the same effect as that of the first embodiment can be obtained by a determination method different from that of the first embodiment.
In particular, in a portion where the double-sided tape 31 for paper splicing is present, the capacitance C changes greatly due to the moisture of the adhesive glue, so that the deviation ΔCC appears remarkably, and the paper splicing portion 20 is determined with high accuracy. Can do. In this respect, it is considered that the influence of the fine detection value fluctuation by the core 23 is small, and the determination based on the deviation of the capacitances C1 and C2 itself is sufficient without using the moving average as in this embodiment. It is considered that accuracy can be obtained.

[Third Embodiment]
FIG. 7 is a view for explaining a corrugator paper splice removing device and a corrugator according to a third embodiment of the present invention.
As shown in FIG. 7, the present embodiment is the same as that of the first embodiment except that a humid double-sided tape 33 containing a larger amount of moisture than a normal double-sided tape is used as a double-sided tape for paper joining. is there.

  According to the present embodiment, since the dielectric constant ε of the spliced portion 20 changes greatly due to a large amount of moisture in the humid double-sided tape 33, the value of the capacitance C changes more significantly, and the amount of change ΔC becomes remarkable. As a result, the determination of the paper splicing portion 20 can be performed with high accuracy. Also in this case, it is considered that the influence of the fine detection value fluctuation by the core 23 is small, and sufficient accuracy can be obtained even in the determination based on the change of the capacitance C itself without using the moving average as in the first embodiment. Is considered to be obtained.

[Fourth Embodiment]
FIG. 8 is a view for explaining a corrugator splice removal device and corrugator according to a fourth embodiment of the present invention.
As shown in FIG. 8, this embodiment is substantially the same as the first embodiment, and moisture (preferably 1 to 5 weight relative to the paper) is applied to the paper splicing portion 20 by a moisture applying means such as a shower device (not shown). The only difference is that about 34% moisture) 34 is applied. For example, the moisture applying means such as a shower device may be provided in the vicinity of a location where a splicer (paper splicing device) (not shown) performs a paper splicing process.

  According to the present embodiment, since the dielectric constant ε of the paper splicing portion 20 changes greatly due to the moisture 34 applied to the paper splicing portion 20, the value of the capacitance C changes more significantly, and the change amount ΔC is remarkable. And the determination of the splicing portion 20 can be performed with high accuracy. Also in this case, it is considered that the influence of the fine detection value fluctuation by the core 23 is small, and sufficient accuracy can be obtained even in the determination based on the change of the capacitance C itself without using the moving average as in the first embodiment. Is considered to be obtained.

[Fifth Embodiment]
FIG. 9 is a view for explaining a corrugator paper splice removing device and a corrugator according to a fifth embodiment of the present invention.
As shown in FIG. 9, the present embodiment is substantially the same as the second embodiment, and a portion where the double-sided tape 31 for paper splicing of the paper splicing portion 20 is pasted by moisture applying means such as a shower device (not shown). The only difference is that water (preferably about 1 to 5% by weight of water) 34 is applied. For example, the moisture applying means such as a shower device may be provided in the vicinity of a location where a splicer (paper splicing device) (not shown) performs a paper splicing process.

  According to the present embodiment, since the dielectric constant ε of the paper splicing portion 20 is greatly changed by the moisture 34 applied to the paper splicing double-sided tape 31 of the paper splicing portion 20, each detection signal (capacitance) C1, C2 Difference ΔCC appears remarkably, and the determination of the splicing portion 20 can be performed with higher accuracy. Also in this case, it is considered that the influence of fine detection value fluctuations by the core 23 is small, and it is considered that sufficient accuracy can be obtained even in the determination based on the deviation of the capacitance C itself.

(Other)
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be implemented with appropriate modifications, omissions, or combinations without departing from the spirit of the present invention. .
In addition, the present invention focuses on the thickness of the corrugated cardboard paper or the processed product of the corrugated cardboard paper, and is not limited to the capacitance-type non-contact thickness sensor, and other non-contact thickness sensors can be applied. is there.
Of course, if a capacitance-type non-contact thickness sensor is applied, not only the thickness but also the moisture of the double-sided tape for paper splicing contributes to the improvement of detection accuracy, which is more effective.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates a corrugator paper splice detection device according to a first embodiment of the present invention, where (a) is a perspective view of the main part thereof and (b) is a flowchart illustrating a paper splice detection process. It is a lineblock diagram of a corrugator explaining an example of installation of a non-contact thickness sensor concerning each embodiment of the present invention. It is a principal part side view of the paper splice part detection apparatus of the corrugator concerning 1st Embodiment of this invention. It is a graph explaining the example of the detection data of the non-contact thickness sensor concerning 1st Embodiment of this invention. 6A and 7B illustrate a corrugator paper splice detection device according to a second embodiment of the present invention, in which FIG. 5A is a perspective view of an essential part thereof, and FIG. 5B is a flowchart illustrating a paper splice detection process. It is a graph explaining the example of the detection data of the non-contact thickness sensor concerning 2nd Embodiment of this invention, (a) shows the detection data itself of each sensor, (b) is the deviation of the detection data of each sensor. Indicates. It is a principal part perspective view explaining the paper splice part detection apparatus of the corrugator concerning 3rd Embodiment of this invention. It is a principal part perspective view explaining the paper splice part detection apparatus of the corrugator concerning 4th Embodiment of this invention. It is a principal part perspective view explaining the paper splice part detection apparatus of the corrugator concerning 5th Embodiment of this invention. It is a block diagram of the corrugator explaining the conventional paper splice part detection technique using a metal sensor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Single facer 12 Glue machine 13 Double facer 14 Slitter scorer 15 Cut off 16 Stacker 17a, 17b, 17c Preheater roller 18 Bridge part 19 Defective part removal device 23a Corrugation 20 Paper splicing part 21, 21a, 21b Liner 22 In core paper 23 Core 24 Single-sided corrugated cardboard (corrugated cardboard or processed cardboard)
25 Liner 26 Double-sided cardboard 27a, 27b Double-sided cardboard sheet (corrugated cardboard cutting sheet)
30, 31 Double-sided tape for paper splicing 32 Portion where the double-sided tape 31 for paper splicing is not affixed 33 Moist double-sided tape 34 Moisture 40, 40a to 40e, 41, 42 Capacitive non-contact thickness sensors 50A, 50B Device 51 Calculation unit 52 Determination unit

Claims (15)

In the corrugator, a device for detecting a spliced portion of a corrugated base paper,
A non-contact thickness sensor that is installed in the corrugator production line and detects the thickness information of the corrugated base paper or the corrugated base paper processed in a non-contact manner;
A corrugator paper splicing part detection device, comprising: a determination device that determines, from the detection information of the non-contact thickness sensor, specific detection information as the paper splicing part. The corrugator splice detection device according to claim 1, wherein the non-contact thickness sensor is a capacitance-type non-contact thickness sensor that detects the thickness information from a capacitance. 3. The corrugator paper splice detection device according to claim 1, wherein the paper splicing section is spliced by a double-sided tape for paper splicing. The apparatus of claim 3, further comprising a moisture applying device that applies moisture to a location where the double-sided tape for front joining of the paper joining portion is pasted upstream of the non-contact thickness sensor. The paper splice detection device for the corrugator as described. The determination apparatus determines, as the paper splicing portion, a portion where a detection value of the non-contact thickness sensor sequentially obtained according to the travel of the corrugated base paper or the processed product of the corrugated base paper has changed by a predetermined amount or more. The paper splice detection device for a corrugator according to any one of claims 1 to 4. The determination device calculates a moving average of detection values of the non-contact thickness sensor sequentially obtained according to the running of the corrugated base paper or the processed corrugated base paper, and the moving average has changed by a predetermined amount or more. 5. The corrugator paper splicing part detection device according to claim 1, wherein the paper splicing part is determined as the paper splicing part. The paper splicing part is paper spliced by being partially pasted with a double-sided tape for paper splicing at a predetermined location in the paper width direction,
The non-contact thickness sensor is a first sensor installed at a position in the paper width direction to which the double-sided tape for paper splicing is affixed at the same position in the running direction of the corrugated base paper or a processed product of the corrugated base paper, A second sensor installed at a position in the paper width direction where the double-sided tape for paper splicing cannot be attached;
The determination device calculates a deviation between detection values of the first sensor and the second sensor, and determines a portion where the deviation is a predetermined amount or more as the paper splicing portion. 5. The corrugator paper splice detection device according to any one of 1 to 4. A corrugator equipped with the corrugator splice detection device according to any one of claims 1 to 7, wherein the corrugator is a downstream portion of a cutting step of cutting a cardboard manufactured by a double facer into a cardboard cutting sheet, and before the stacker. And a removing device that identifies the corrugated sheet cut sheet including the paper splicing portion detected by the corrugator paper splicing portion detection device and removes the cardboard cut sheet so as not to be stacked on the stacker. Corrugator with joint removal device. In a corrugator, a method for detecting a splice portion of a corrugated cardboard paper,
A step of detecting contactless thickness information of the corrugated base paper passing through the corrugator production line or a processed product of the corrugated base paper; and
A corrugator splice detection method, comprising: a step of determining a portion where specific detection information is obtained from the detection information in the detection step as the splice portion. 10. The corrugator splice detection method according to claim 9, wherein in the detection step, the thickness information is detected from a capacitance using a capacitance-type non-contact thickness sensor. The paper splicing portion is spliced by a double-sided tape for paper splicing, and in the detecting step, the terminal end portion of the first corrugated paper base sheet, the start end portion of the first corrugated paper base paper, and the paper splicing portion in the paper splicing portion. The method for detecting a splice portion of a corrugator according to claim 9 or 10, wherein the thickness information obtained by superimposing with the double-sided tape is detected. Before detecting the thickness information by the detection step, further comprising a moisture application step of applying moisture to the portion where the double-sided tape for front sheet joining of the paper joint part is attached, The corrugator paper splice detection method according to claim 11. In the determination step, a portion where the detection value sequentially detected by the detection step changes by a predetermined amount or more according to the travel of the corrugated base paper or the processed corrugated base paper is determined as the paper splicing portion. The method for detecting a splice portion of a corrugator according to any one of claims 9 to 12. In the determination step, a moving average of the detection values sequentially detected by the detection step according to the travel of the corrugated base paper or the processed product of the corrugated base paper is calculated, and the location where the moving average has changed by a predetermined amount or more is calculated. The corrugator paper splice detection method according to any one of claims 9 to 12, wherein the paper splice is determined as a paper splice. The paper splicing part is paper spliced by being partially pasted with a double-sided tape for paper splicing at a predetermined location in the paper width direction,
In the detection step, the first thickness information at the position in the paper width direction where the double-sided tape for paper splicing is pasted at the same position in the running direction of the corrugated base paper or the processed product of the corrugated base paper, and the paper splicing Detecting the second thickness information at the position in the paper width direction where the double-sided tape cannot be attached,
In the determination step, it is determined that a portion where a deviation between the value of the first thickness information detected in the detection step and the value of the second thickness information is a predetermined amount or more is the paper splicing portion. The corrugator splice detection method according to any one of claims 9 to 12, wherein the corrugator splice portion detection method is characterized.

Images