JP6179168B2 - Method and apparatus for applying tape to corrugated paper traveling at high speed - Google Patents

Description

The present invention is a method of applying an adhesive tape to the surface of a product corrugated paper in the same line in the production of corrugated paper, and starts adhering to the corrugated paper running at high speed without causing any trouble It relates to a method that can be continued and terminated, and also to an apparatus used to carry out the method.

When producing corrugated paper, tape is affixed for the purpose of reinforcing the performance desired for various end products made from the product corrugated paper, such as packaging boxes, or for easy opening. Often, a tape coated with an adhesive is applied. This type of tape is usually made of a tough material such as polypropylene, applied with adhesive on one side and wound on a reel. For efficiency, the operation of attaching the tape to the corrugated paper is generally carried out in the same line as the corrugated board production.

As the corrugated paper manufacturing technology has advanced, the production speed has increased and the line speed has become as high as 200 to 250 m / min. It is not easy to attach a tape coated with an adhesive onto such corrugated paper that is running at a high speed, and there is a problem particularly at the start of the application.

As an improved technique for smoothly applying the tape to the running corrugated cardboard, the applicant has developed and proposed a technique including the start of tape application in the following process (Patent Document 1). :
A) An end of a tape to which an adhesive is applied on one side is affixed almost on the center line of a start sheet prepared with strip-shaped cardboard, and the center of the start sheet is lifted by vacuum suction.
B) The start sheet with the end of the tape attached is held by holding the front and rear ends under the first and second pressing rolls arranged in series in the running direction.
C) The two front and rear pressing rolls are suddenly pressed toward the running cardboard and the vacuum suction is released.
D) The start sheet is moved with the corrugated paper by friction and moved forward from the second pressing roll, and the tape is first pressed against the corrugated paper with the first pressing roll and then with the second pressing roll. Let

Subsequently, the applicant has developed a technique for continuously attaching the tape, that is, a tape attaching technique that enables a "splice" operation to add the tape, which has already been disclosed (Patent Document 2). . These techniques have been well received, and a number of apparatuses for their implementation have been employed in the art.

However, pasting the end of a stationary tape on corrugated paper running at high speed causes excessive tension to be applied to the tape until the reel rotates and the tape feeds on the track. There is a negative effect of distorting the product. Therefore, it was unavoidable that the line speed was reduced at the start of the adhesive tape application, and the end of the adhesive tape was made to adhere to the corrugated paper that traveled, and after that, a compromise was made to increase the line speed. However, the temporary decrease in line speed is not limited to a reduction in productivity, and may have a significant impact on the quality of the product corrugated paper itself. Specifically, there are problems such as poor adhesion between corrugated paper and liner paper, lack of strength caused by it, warpage, and easy cracking.

In order to solve this problem, the applicant further relieves the abrupt tensile stress applied to the tape when the tape starts running, prevents the tape from sagging, and ensures that the tape is always drawn out under a constant tension. Realized the means to guarantee. The means is that the tape supply roll manufactured from an elastic material is pressed against the tape supply reel, and the tape supply roll is rotated by the rotation drive means so that the tape is fed out at a high speed at the start of tape application, and in a steady operation state. A means for applying a certain tension as a tape brake is added. This technique is also disclosed (Patent Document 3).
Japanese Patent No. 4487350 Japanese Patent No. 4366789 JP 2001-179861 A

Regarding the third technology, the inventor who continued further research with the aim of increasing the responsiveness of the rotational driving force applied to the tape feeding roll at the start of tape application, driven the tape supply bobbin by a servo motor, The idea is to automatically calculate the appropriate driving force based on the relationship between the planned running speed and the detected tape supply bobbin diameter, and to control the servo motor based on the result. As a result, it was confirmed that such a solution was effective.

The purpose of the present invention is to take advantage of the above-mentioned experience by the inventor and affect the product quality by lowering the running speed of corrugated paper when affixing tape to the corrugated paper that has just been produced and is running at high speed Start of tape application so that it can be stopped to the extent that it will not be applied, and on the other hand, the stress remaining on the applied tape is kept within limits that do not adversely affect the quality of the corrugated paper product. It is to provide a method that allows continuation and termination. It is also within the scope of the present invention to provide an apparatus for use in performing the method.

The method of sticking an adhesive tape to corrugated paper that travels at high speed during the production of the corrugated paper of the present invention comprises the following steps:
1) Prior to operation of the apparatus, the diameter of each tape supply bobbin is measured, and given to the rotation axis of the tape supply bobbin at the start of application based on the relationship between the measured diameter and the speed at which the corrugated paper travels. Calculating the value of the "kicking out" torque,
2) Waiting while preventing slack of the tape by applying a reverse rotation torque of a controlled value to the tape supply bobbin by the servo motor;
3) When starting to attach the tape to the corrugated cardboard that is running, the above-mentioned “kick-out” torque command is given to the servo motor that drives the rotating shaft of the tape supply bobbin, thereby running the corrugated cardboard. Initiating tape application under conditions that reduce the tension generated by the tape as it pulls the tape;
3) After entering the steady operation, the reverse rotation braking torque by the servo motor is applied to the tape supply bobbin to control the tension of the tape, which may cause the running speed of the corrugated paper to drop sharply. However, the tape supply bobbin can continue to be stuck while preventing the rotation due to inertia,
And 4) measuring the tape supply bobbin diameter, which decreases as the application progresses, continuously or intermittently, so as to avoid the increase in tape tension caused by the measured decrease in diameter. Continue to apply the tape while adjusting the torque.

The apparatus for applying an adhesive tape to corrugated paper that travels at a high speed during the manufacture of the corrugated paper of the present invention is required to attach the adhesive tape to the corrugated paper that travels at a high speed. In addition to the pressing means for adhering to the paper, the following parts are the basic components:
(A) a plurality of tape supply bobbins driven by a servo motor;
(B) a servo motor that is attached to the rotation shaft of each tape supply bobbin, and that gives the rotation torque adjusted in the forward direction or reverse rotation braking torque in the reverse direction;
(C) means for continuously or intermittently measuring the diameter of each tape supply bobbin;
(D) means for calculating a “kicking-out” torque at the start of sticking to be applied to the tape supply bobbin based on the relationship between the measured diameter of the tape supply bobbin and various speeds of the corrugated paper;
(E) means for calculating an appropriate value of the reverse rotation braking torque to be applied to the tape supply bobbin in response to a steady change and when the corrugated paper travel speed changes abruptly;
And
(F) A panel for displaying the calculated values of (D) and (E), and a control panel having a function of issuing a command to the servomotor based on the values.

According to the method of the present invention, when an adhesive tape is applied to corrugated paper that travels at a high speed during the production of the corrugated paper, first, a reverse rotation torque controlled by a servo motor is applied to the tape supply bobbin during standby. Therefore, sagging of the tape is prevented. At the beginning of pasting, the tape supply bobbin is given a “kicking” torque that is calculated appropriately based on the relationship between the tape supply bobbin diameter and the cardboard paper travel speed. Even if it is not lowered, it is possible to reliably start the pasting. Needless to say, if the traveling speed of the corrugated cardboard is not lowered when the tape is applied, the workability of the corrugated cardboard manufacturing is improved.

If the running speed of the corrugated paper does not change at all or hardly changes when applying the tape, the adverse effect on the quality of the product corrugated board due to the change in the line speed at the time of manufacture should be suppressed to zero or virtually negligible. Can do. At the same time, the stress remaining on the applied tape is zero or slight. As a result, when the tape-bonded corrugated paper is made into a final product, for example, when it is made into a box, various disadvantages such as distortion in the size and shape of the box due to the stress remaining on the tape can be avoided.

At the time of steady operation, reverse rotation braking torque is applied to the tape supply bobbin by a servo motor, so that the tape is being applied to the running corrugated paper with an appropriate tension applied thereto. When the traveling speed of the corrugated paper changes suddenly for some reason, the phenomenon that the tape supply bobbin rotates due to inertia and sags on the tape can be prevented. As the production of cardboard paper with tape progresses, the bobbin diameter decreases as the tape is consumed, and if the rotation is not increased, the tension applied to the tape increases. By adjusting the tape, it is possible to proceed with the tape application under the condition of maintaining a certain tension.

If the present invention is applied to an apparatus for applying an adhesive tape to corrugated paper that travels at a high speed during the production of the corrugated paper, the above-mentioned effects can be obtained, and the tape can be advantageously applied to the corrugated paper. Product can be obtained. This application can be easily performed by a conventional servo motor and its control technology, and the apparatus of the present invention requires a small amount of equipment.

As a pressing means for adhering an adhesive tape to corrugated paper that is an object to which the apparatus of the present invention is applied, and sticking the adhesive tape to the corrugated paper running at high speed, the above-mentioned patent document Although the apparatus described in 1 is appropriate, the apparatus of the present invention can be combined with any means having any other configuration as long as it can start affixing the tape end quickly.

Any means for continuously or intermittently measuring the diameter of the tape supply bobbin can be adopted. For example, a reflection beam sensor is suitable. The reflective beam sensor is a device that is disposed near the side surface of the tape supply bobbin, irradiates light therefrom, and obtains information about the diameter of the bobbin by a light signal reflected from the bobbin. If the means for calculating the "kicking out" torque and the reverse rotation braking torque and the means for displaying the calculated value are configured on an integrated control panel, which is also a digital display touch panel, conditions can be set or changed. Convenient for.

Tape supply bobbins usually have different widths and lengths of tape to be affixed to corrugated paper, and the length to be used is often different depending on each tape. Since the amount of tape required varies depending on the content of the pasting work for each lot, the remaining tape bobbin with a reduced diameter must be used for the next work, and the tape is exhausted. Must mobilize adjacent bobbins and “splice” by the splicing technique described above. At the time of this joining, the system should be configured so that the bobbin whose remaining tape amount is small and the bobbin serving as the successor can be smoothly coordinated. Therefore, it is necessary to provide a large number of, for example, twelve, tape supply bobbins directly connected to servo motors in the tape applicator to be combined with the corrugated paper manufacturing apparatus. In the example shown in FIG. 1, only three sets of AC servo motors that perform torque control in accordance with instructions from the controller of the control panel and PG (pulse generator) that detects the number of rotations are shown.

In the apparatus for sticking an adhesive tape to corrugated paper that travels at high speed during the production of the corrugated paper of the present invention, the configuration of the portion to be installed in addition to the pressing means for adhering the end of the tape to the corrugated paper, A conceptual diagram showing only a part of it.

Claims (2)

A method of applying an adhesive tape to corrugated paper that travels at a high speed during the production of corrugated paper, comprising the following processes:
(1) Prior to the operation of the apparatus, the diameter of each tape supply bobbin is measured, and based on the relationship between the measured diameter and the speed at which the corrugated paper travels, Calculating the value of the "kicking out" torque to be given,
(2) Standby while preventing slack of the tape by applying a reverse rotation torque of a value controlled by the servo motor to the tape supply bobbin;
(3) When starting to attach the tape to the corrugated cardboard that is running, the corrugated cardboard that travels is given by giving the above-mentioned "kicking out" torque command to the servo motor that drives the rotating shaft of the tape supply bobbin. Initiating tape application under conditions where the tension on the tape is reduced as the paper pulls the tape;
(4) After entering the steady operation, the reverse rotation braking torque by the servo motor is applied to the tape supply bobbin to control the tension of the tape, so that the running speed of the corrugated paper is drastically decreased. Even if there is, the tape supply bobbin is kept from rotating due to inertia and the tape sticking is continued.
And (5) continuously or intermittently measuring the tape supply bobbin diameter, which decreases as the application progresses, and reverse rotation to avoid increased tape tension caused by the measured decrease in diameter Continue applying the tape while adjusting the braking torque. A device that attaches adhesive tape to corrugated paper that travels at a high speed during the manufacture of corrugated paper, and the edge of the tape is required to attach the adhesive tape to corrugated paper that travels at high speed. In addition to pressing means for adhering, the following parts are the basic components:
(A) a plurality of tape supply bobbins driven by a servo motor;
(B) a servo motor that is attached to the rotation shaft of each tape supply bobbin, and that gives the rotation torque adjusted in the forward direction or reverse rotation braking torque in the reverse direction;
(C) means for continuously or intermittently measuring the diameter of each tape supply bobbin;
(D) means for calculating a “kicking-out” torque at the start of sticking to be applied to the tape supply bobbin based on the relationship between the measured diameter of the tape supply bobbin and various speeds of the corrugated paper;
(E) means for calculating an appropriate value of the reverse rotation braking torque to be applied to the tape supply bobbin in response to a steady change and when the corrugated paper travel speed changes abruptly;
And
(F) A panel for displaying the calculated values of (D) and (E), and a control panel having a function of issuing a command to the servomotor based on the values.

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