JP2001121627A - Method and apparatus for adjusting transfer amount of paste in corrugator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject method and apparatus for accurately controlling the supply amount of the paste by adjusting the gap between a paste roll and a doctor roll so as to make the amount of the paste, which is transferred to the flute tip parts of a corrugating medium corrugated by a single facer by the paste roll of a pasting apparatus, proper to adjust the transfer amount of paste. SOLUTION: The difference between collected amounts of paste by first and second collecting means 8a, 8b collecting paste at a position where the paste is not transferred to the flute tip parts of the corrugating medium (a) on the peripheral surface of a paste roll and a position where the paste is transferred thereto is compared with a proper amount and the gap between the paste roll 6 and a doctor roll 7 is adjusted corresponding to the magnitude of the difference to make the transfer amount of the paste proper.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for adjusting the amount of glue transferred in a corrugator for adjusting the amount of glue transferred from a glue roll to the top of corrugated middle-sheet paper.

[0002]

2. Description of the Related Art In a single facer of a corrugator, a single-faced cardboard sheet is formed as follows. That is, as shown in FIG. 4, the middle paper a is fed between the pair of step rolls 1 and 2 to be formed into a waveform, and then moves in a state of being closely attached to the surface of the step roll 2, During this movement, the glue roll 6 of the gluing device 3 is brought into contact with the top of the middle sheet a to transfer and glue the glue on the surface. The middle sheet a to which the glue is adhered to the top of the step further moves, and is pressed against the liner sheet b sent by the pressure belt 4 during this movement to form the single-sided cardboard sheet S. Reference numerals 5a, 5b and 5c indicate rollers around which the pressure belt 4 is wound.

A doctor roll 7 is provided opposite to the paste roll 6 so that a part thereof is immersed in the paste liquid in the paste tank 8 so as to form a uniform and appropriate amount of paste film on the surface of the paste roll 6. Excess glue transferred to the roll 6 is scraped off. The amount of glue transferred onto the outer peripheral surface of the glue roll 6 is determined by the gap amount with the doctor roll 7, and the gap amount is adjusted so as to conform to various conditions such as paper thickness and paper quality of the middle sheet and liner paper. It is adjusted appropriately and set to an optimum state.

[0004] A sizing apparatus in which the gap between the glue roll 6 and the doctor roll 7 is adjusted so that the amount of glue transferred by the glue roll 6 has an optimum thickness according to the paper thickness and the type of paper quality. Single facer provided
No. 266471. In the single facer disclosed in this publication, a value obtained by an empirical calculation formula using respective coefficients and the like empirically determined based on the thickness and quality of the paper used is used. By adjusting the gap between the glue roll and the doctor roll, the amount of glue on the surface of the glue roll is determined, and this glue is transferred to the top of the middle sheet.

[0005]

However, in the above-mentioned conventional single facer, the transfer amount of the paste from the paste roll to the top of the middle sheet is determined based on the gap value obtained by an empirical formula. I just adjust it,
It is not clear whether the amount of glue actually transferred to the top of the step is the optimal amount empirically predicted.

That is, even if the gap value is determined by a calculation formula, depending on the temperature, moisture content, viscosity, etc. of the glue, the running speed of the paper or the rotating speed of the glue roll and the doctor roll, the glue on the top of the middle sheet is adjusted. Is not constant and is not always an appropriate amount. Therefore, there is a possibility that defective products may be generated due to poor bonding and waste may be caused due to an excessive amount of glue used.

In order to solve the above-mentioned problem, the present invention obtains the actual amount of paste transferred from the paste roll to the top of the middle sheet, and determines the amount of paste between the paste roll and the doctor roll so that the paste amount becomes appropriate. An object of the present invention is to provide a method and an apparatus for adjusting a transfer amount of a glue in a corrugator in which a gap is adjusted to prevent wasteful use of a glue and obtain a high-quality corrugated product without poor bonding.

[0008]

According to the present invention, as a means for solving the above-mentioned problems, a gap between a glue roll and a doctor roll which are opposed to each other is adjusted by a roll gap adjusting mechanism, so that the glue in the glue tank is adjusted. After adjusting the amount of glue on the outer peripheral surface of the glue roll after immersion, the adjusted amount of glue is transferred to the top of the corrugated middle paper that is corrugated into a corrugated sheet that forms a single-sided cardboard sheet with liner paper. In the method of adjusting the transfer amount of the glue in the corrugator, the amount of difference in the amount of each glue collected between the position where the glue is not transferred to the top of the middle paper on the surface of the glue roll and the transferred position, Compare the appropriate amount of glue to be transferred to the top of the middle paper, and if the comparison result shows that the amount of difference matches the appropriate amount, maintain the gap in that state. If the volume is smaller, make the gap larger Or, when the difference amount is larger than the proper amount, the gap is made smaller, and the transfer amount of the glue in the corrugator is adjusted so that the transfer amount of the paste to the top of the middle paper is made the proper amount. It was.

Further, as a device for implementing the above-mentioned method for adjusting the amount of transfer of the glue, the gap between the glue roll and the doctor roll which are arranged opposite to each other is adjusted by a roll gap adjusting mechanism.
After adjusting the amount of glue on the outer peripheral surface of the glue roll after dipping in the glue in the glue tank, this adjusted amount of glue is applied to the liner paper to form a single-sided corrugated cardboard sheet. In the glue transfer amount adjusting device in the corrugator adapted to transfer to the step top, in the glue roll outer peripheral surface, the respective pastes at the position where the glue is not transferred to the step top of the middle paper and the transferred position are collected. First and second sampling means, a sampling quantity measuring unit for measuring the first and second sampling quantities in the first and second sampling means, and a difference between the first sampling quantity and the second sampling quantity as a transfer amount of glue. The amount of the difference is compared with the appropriate amount of the paste to be transferred from the adhesive roll to the top of the middle sheet paper, and as a result of this comparison, the difference amount matches the appropriate amount. If the difference is smaller than the appropriate amount, maintain the above gap in that state. Is larger the gap, or, if the amount is greater than the proper amount of the difference and a control unit for outputting a control signal so as to further reduce the gap,
By controlling the roll gap adjusting mechanism with this control signal, it is possible to employ a glue transfer amount adjusting device in a corrugator in which the glue transfer amount to the top of the middle sheet is adjusted to an appropriate amount.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a main cross-sectional view of a single facer provided with a glue transfer amount adjusting device. The single facer itself is a conventional type, and a pair of step rolls 1,
When the required amount of glue is transferred (adhered) by the glue roll 6 of the gluing device 3 to the top of the step, the intermediate paper a sent between the two is stepped and formed into a waveform. The liner paper b fed by the placed pressure belt 4 is pressure-bonded to form a single-sided corrugated cardboard sheet S.

The pressure belt 4 has a plurality of rollers 5a, 5b,
An endless belt is wound around 5c, and is provided so that a part of the endless belt is pressed against the outer peripheral surface of the step roll 2. A glue roll 6 of a gluing device 3 is provided on the outer peripheral surface of the step roll 2 with a gap corresponding to the thickness of the middle paper a. The gluing device 3 is also of a conventional general type, and includes a doctor roll 7 for adjusting the thickness of the glue film on the surface of the glue roll 6.

A glue tank 8 for adhering the glue on the outer peripheral surface of the glue roll 6 is provided, and the glue G in the glue tank 8 is stored in a predetermined range in the width direction of the glue roll 6. Are provided movably in the width direction thereof. Therefore, the glue G adheres only on the surface of the glue roll 6, a part of which is immersed in the glue G in the glue tank 8 during rotation, within a range defined by the pair of dams 9, 9. .

As shown in FIG. 1, collecting means 8a and 8b for collecting the paste on the outer peripheral surface of the paste roll 6 so as to scrape it while sucking it are opposed to and contact the outer peripheral surface. It is provided. These collecting means 8a and 8b have a certain width so as to be in contact with the surface of the glue roll 6 along the surface.
It consists of the same trumpet-shaped suction nozzle with a widened sampling port.

As shown in FIGS. 2 and 3, the mounting position of the collecting means 8a in the width direction of the glue roll 6 is a position outside one end of the middle sheet a, and that of the collecting means 8b is , A position between both end portions of the middle sheet a.

The mounting position in the outer circumferential direction of the glue roll 6 of the collection means 8a, as shown in FIG. 1, along the rotation direction of the glue roll 6 from the position P ₁ of the portion facing the Dokutaroru 7 of glue rolls 6 is up to the position P ₃ glue roll 6 is immersed in the glue G in the adhesive tank 8, also that of collecting means 8b is
Along the rotation direction of the glue roll 6, the position from the position P ₂ of the facing portion of the glue roll 6 to the step roll 2 to the position P ₃ at which the glue roll 6 is immersed in the glue G in the glue tank 8.

The pair of dams 9, 9 are screwed to corresponding screw shafts (not shown), and each of the screw shafts is appropriately rotated by a motor so that the dam shown in FIG.
As shown in FIG. 3, one dam 9 on the side of the sampling means 8a is positioned outside the sampling means 8a.
The other dam 9 is positioned corresponding to one end of the middle sheet a.

A pair of dams 9 and 9 are screwed into each of the screw shafts provided with reverse screws, and the pair of dams 9 and 9 are rotated left and right by rotating the screw shafts with a motor. You may make it move symmetrically and position it.

The sampling means 8a is integrally attached to one of the dams 9, so that the sampling means 8a is moved together with the dam 9 in accordance with the width of the middle sheet a or the end position of the sheet to adjust its position. It may be. Also, the position of the sampling means 8b does not necessarily need to be moved and adjusted, but may be fixedly attached.

The glue roll 6 only needs to be able to transfer the glue over the entire width of the top of the middle paper a.
May not be provided, and in this case, the position of the sampling means 8a in the width direction may be adjusted by appropriate means.

According to the above configuration, the glue on the outer peripheral surface of the glue roll 6 whose glue amount has been appropriately and uniformly adjusted in the roll width direction by the doctor roll 7 is collected by the collecting means 8a. The glue slightly remaining on the surface of the glue roll 6 after being transferred to the top of the paper a is collected by the collecting means 8b.

The sampling means 8 in the single facer
FIG. 3 shows a schematic configuration of an apparatus for measuring and adjusting the transfer amount of the glue using a and 8b. As shown, the sampling means 8a, 8
b, the sampling amount measuring unit 10 using the weight measuring type flow meters 10a and 10b, and the suction pumps 11a and 11b are connected,
The glue G collected by suction is sent to the glue return tank 12. It should be noted that the glue sucking action by the sampling means 8a and 8b is such that glue in the width direction which is excessive than the width of the sampling port is not sucked more than necessary.

The flow meters 10a and 10b are provided with a suction pump 11
The flow rates of the glue sucked by the suction forces a and 11b are measured, and these flow rate values (g / min) are converted into electric signals A and B, respectively, and sent to the control unit 20. An external production management device (not shown) supplies the control unit 20 with an appropriate amount W of the size d (m) in the roll width direction of the sampling port of the sampling means 8a and 8b and the amount of glue transfer per unit area of the single-sided corrugated cardboard sheet S. (G / m ² ), and a signal corresponding to the traveling speed V (m / min) such as the speed of the paper in the single facer portion or the peripheral speed of the glue roll 6 is output from a speed detector (not shown). Sent in.

The controller 20 sends a signal for adjusting the gap between the glue roll 6 and the doctor roll 7 to the motor 13 of the roll gap adjusting mechanism C based on these signals. The eccentric bearing 14 is rotated by the motor 13, and the doctor roll 7 having the shaft attached to the eccentric position is
By appropriately approaching and separating from the glue roll 6 whose position is fixed, the gap amount with the glue roll 6 is adjusted so that an appropriate amount of glue is adhered on the outer peripheral surface of the glue roll 6. You. The gap amount is obtained by detecting the position of the axis of the doctor roll 7 with the detector 15, and the corresponding signal is sent to the control unit 20.

The motor 13, the eccentric bearing 14, the detector 1
Reference numeral 5 denotes a roll gap adjusting mechanism C. The flow meter 1
Volumes 0a and 10b may be of the volume measurement type. In this case, however, it is necessary to convert the measured volume into a weight based on the specific gravity of the glue.

The transfer amount of the paste transferred to the top of the middle paper a which has been stepped by the single facer having the above-described structure is adjusted by the paste transfer amount adjusting device as follows.
The glue roll 6 on which the glue amount adjusted by the doctor roll 7 is adhered on the outer circumferential surface is located at a position outside the end of the middle sheet a during the rotation and does not transfer to the top of the step. Is collected by the collecting means 8a, and the glue is collected by the collecting means 8b at a position inside the end of the middle sheet a and transferred to the top of the step, so that the difference in the amount Is the amount of glue actually transferred to the top of the middle paper a.

The roll gap adjusting mechanism C controls the size of the glue roll 6 so that the amount of the transferred glue becomes a predetermined appropriate amount.
What is necessary is just to adjust the clearance between the doctor roll 7. The appropriate amount is usually 1 m of the single-sided cardboard sheet S for convenience.
It is set and controlled by the number of g of paste transferred to ^two (g / m ² ).

The amount of glue collected by the collecting units 8a and 8b is measured by the flow meters 10a and 10b of the collected amount measuring unit 10 and sent to the control unit 20 as signals A and B. In the control unit 20, the respective flow rates are detected from the signals A and B, and the following predetermined calculation is performed by the calculation unit based on the detected values.

(Flow A (g / min) -Flow B (g / min))
/ (Sampling port width d (m) × speed V (m / min)) = per unit area transferred amount w (g / m ²⁾ That is, first, the flow rate A (g /
Min) and the flow rate B (g / min) are subtracted to calculate the transfer amount of the glue. Then, the transfer amount of the glue is measured by the sampling means 8a, 8b.
Is divided by the sampling port width d (m) and the traveling speed V (m / min) to obtain the transfer amount w (g /
m ² ).

By the above calculation, the transfer amount w per unit area
When (g / m ² ) is obtained, the comparison and determination unit of the control unit 20 determines the appropriate amount W (g) per unit area of the single-sided cardboard sheet S.
/ M ² ). In this comparison determination, if W = w, it is determined that the gap is appropriate. If D ₁ W> w, it is determined that the gap needs to be made larger. If D ₂ W <w, the gap becomes smaller. When one of the determination at decision D ₃ of the need to, motor 1 control signal from the control unit 20 based on the determination of the roll gap adjusting mechanism C
3 and the following control is performed.

[0030] When the decision D ₁ is made, for the amount of transferred adhesive which has been transferred to Dan'itadaki portion of the corrugating medium a is correct, there is no need to change the gap amount between the glue roll 6 and Dokutaroru 7 The controller 20 does not output a signal to the motor 13 for changing the gap.

[0031] When the determination D ₂ is made, for the amount of transferred adhesive which has been transferred to Dan'itadaki portion of the corrugating medium a is less than the proper amount, and larger the gap away Dokutaroru 7 glue roll 6, A signal is transmitted from the control unit 20 to the motor 13 such that the roll gap adjusting mechanism C operates so as to increase the amount of glue adhered to the surface of the glue roll 6.

[0032] For the above determination D ₃ is made, the transfer amount of glue which is transferred to Dan'itadaki portion of the corrugating medium a is greater than the proper amount,
A signal is sent from the control unit 20 such that the doctor roll 7 is moved closer to the glue roll 6 to make the gap smaller and the roll gap adjusting mechanism C operates so as to reduce the amount of glue adhering to the outer peripheral surface of the glue roll 6. It is provided to the motor 13.

In the above determination, the appropriate amount W (g / m
^Two) And the measured transfer amount w (g / m ^Two) And strictly
Even if not, set a predetermined allowable range for the appropriate amount W
If they are within the allowable range,
It may be handled.

The appropriate amount W (g / g)
m ² ) is a value previously sent from the production management device and set in the storage unit of the control unit 20, and includes various values such as the paper quality and paper thickness of the middle sheet, the paper quality and the paper thickness of the liner paper to be bonded, and the like. Assuming the conditions, the amount is determined in advance as an optimum bonding amount for each combination. It should be noted that a plurality of collecting means corresponding to each of the collecting means 8a and 8b may be attached in the roll width direction, and the respective collecting amounts may be averaged.

In the corrugator, in order to bond another liner paper to the single-sided corrugated cardboard sheet to form a corrugated cardboard sheet, another gluing device for transferring and attaching the glue to the top of the middle paper of the single-sided corrugated cardboard sheet is used. It is downstream of the facer. This gluing device includes a glue roll, a doctor roll, and a glue tank similarly to the above-described gluing device using a single facer, and the glue transfer amount adjusting device of the present invention can be applied.

[0036]

According to the method and the apparatus for adjusting the transfer amount of the glue in the corrugator of the present invention, the glue transfer at the position where the glue is not transferred to the top of the middle paper on the surface of the glue roll and the transfer position are described. Since the gap between the glue roll and the doctor roll is adjusted so that the difference in the amount of sampled, that is, the amount of glue actually transferred to the top of the step, matches the appropriate amount of glue to be transferred to the top of the middle paper, The glue transfer amount can be adjusted accurately, preventing the occurrence of defective products due to poor bonding between the saddle paper and liner paper due to the insufficient glue transfer amount and the waste due to the excessive glue transfer amount. it can. In addition, since the amount of the difference in the amount of the glue and the appropriate amount are the amounts per unit area of the single-sided corrugated cardboard sheet, the management of the amount of the glue is simple and easy.

[Brief description of the drawings]

FIG. 1 is a main sectional view of a single facer provided with a glue transfer amount adjusting device.

FIG. 2 is a partial plan view of the same.

FIG. 3 is an overall schematic block diagram of the glue transfer amount adjusting device according to the embodiment;

FIG. 4 is a main sectional view of a conventional single facer.

[Explanation of symbols]

 1, two-stage roll 3 gluing device 6 glue roll 7 doctor roll 8a, 8b sampling means 10 sampling amount measuring unit 20 control unit C roll gap adjusting mechanism

Claims (3)

[Claims] 1. A glue roll on a surface of a glue roll after being immersed in glue in a glue tank is adjusted by adjusting a gap between a glue roll and a doctor roll arranged opposite to each other by a roll gap adjusting mechanism. In the method of adjusting the transfer amount of glue in a corrugator in which the adjusted amount of glue is transferred to the corrugated top of corrugated middle paper that is corrugated into a corrugated sheet that forms a single-sided corrugated cardboard sheet with liner paper, the glue roll surface Compare the difference in the amount of glue collected between the position where the glue is not transferred to the top of the middle paper and the position where the glue is transferred, and the appropriate amount of glue to be transferred to the top of the middle paper. As a result of this comparison, when the difference amount and the appropriate amount match, the gap is maintained in that state, and when the difference amount is smaller than the appropriate amount, the gap is made larger, or If the amount is larger than the appropriate amount, make the gap smaller. A method of adjusting the transfer amount of glue in a corrugator in which the transfer amount of glue to the top of the middle paper is adjusted to an appropriate amount. 2. A glue roll on a surface of a glue roll after being immersed in glue in a glue tank is adjusted by adjusting a gap between a glue roll and a doctor roll arranged opposite to each other by a roll gap adjusting mechanism. In the glue transfer amount adjusting device in the corrugator, which transfers the adjusted amount of glue to the top of the corrugated middle paper that is corrugated into a corrugated sheet forming a single-sided corrugated cardboard sheet with the liner paper, the glue roll surface First and second collecting means for collecting the respective glue at a position where the glue is not transferred to the top of the middle sheet of paper on the surface and at a position where the glue is transferred, and first and second collecting means for the first and second collecting means. A sampling amount measuring unit for measuring the sampling amount, and determining a difference amount between the first sampling amount and the second sampling amount as a transfer amount of the glue; Compare with the appropriate amount of glue to be transferred to the top of the step, As a result of the comparison, when the difference amount and the proper amount match, the gap is maintained in that state, and when the difference amount is smaller than the proper amount, the gap is made larger, or the difference amount is increased. A control unit for outputting a control signal for making the gap smaller if the amount is larger than an appropriate amount. By controlling the roll gap adjusting mechanism with this control signal, the glue on the top of the step of the middle paper is provided. A device for adjusting the transfer amount of glue in a corrugator in which the transfer amount of the paste is adjusted to an appropriate amount. 3. A predetermined calculation based on the respective flow rates as the first and second sampling amounts, the size of the sampling ports of the first and second sampling means in the roll width direction, and the peripheral speed of the liner paper or the glue roll. 3. The apparatus according to claim 2, wherein the transfer amount of the glue is determined per unit area of the single-sided cardboard sheet, and the appropriate amount is set as a set amount per unit area of the single-sided cardboard sheet.