JPH09164613A - Production control of corrugator machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent that the shortage of production quantity is generated by the quantity corresponding to the length of an inferior part generated when splice operation is generated in a mill roll stand after the supply residual length of the mill roll stand at an upstream position becomes stagnation length. SOLUTION: The supply residual length in the splicer 2a of a mill roll stand at an upstream position is preset to the raw paper setting length (one lot producing length) of a corrugated cardboard sheet scheduled to be produced and the production length based on a production number counter by the signal of a cut-off sensor 2a and the stagnation length of paper from the mill roll stand to a cut-off mechanism are subtracted from the preset value by an operation control part 23 to calculate the supply residual length. When the signal of the splicer 2a is detected after the supply residual length becomes the stagnation length or less, a stop signal is inputted to a gate 6b on the basis of the detection signal to stop the signal from a running quantity measuring sensor 6a and the raw paper is excessively sent out during this period by the mill roll stand to prevent the shortage of production quantity caused by the generation of inferiority.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrugator for managing a corrugated sheet produced by a corrugator machine so as to produce a predetermined number of normal corrugated sheets even if a splicing failure occurs due to a splicer during production control. The present invention relates to a production control method for a machine.

[0002]

2. Description of the Related Art FIG. 5 shows an overall schematic mechanism of a general corrugator machine. In addition, the corrugated cardboard sheet manufactured in order to simplify description is a double-sided corrugated cardboard. 1 is a mill roll stand for core raw paper, 1a is a splicer for the same as above, 2 is a mill roll stand for back liner raw paper, 2a is a splicer for same as above, 3 is a heater, 4 is a corrugated core raw paper Then, it is a single facer for producing a single-sided corrugated board by gluing it on the top of the corrugated sheet and sticking the backing liner base paper together.

[0003] The single-faced cardboard 5 manufactured by the single facer 4 is sent to the collecting mechanism 7 by the transfer conveyor 6, where it is gradually sent to the double facer downstream while being stored. In this case, the upstream side including the single facer 4 and the like and the downstream side after the double facer 13 are independently driven by different driving sources, and the storage amount of the single-faced cardboard 5 in the storage mechanism 7 is A travel distance measuring sensor 6a provided on each of the entrance side and the exit side,
The count is detected by the signal 8a. The single-sided corrugated cardboard 5 is heated by a heater 9 through a bridge roll 8 and then glued by a glue machine 11, and rolls 12 of a double facer 13 together with a front liner base paper from a mill roll stand 10 for supplying base paper to be bonded to the lower surface. Sent to and pasted. The laminated cardboard sheet 14
After being dried by heating in the heating section of the double facer 13, the cooling section travels a predetermined distance and is cooled.

[0004] The corrugated cardboard sheet 14 that has passed through the double facer 13 is cut into necessary slits and ruled lines by a slitter / scorer 16 and then cut by a cut-off mechanism 17 equipped with a rotary cutter to a predetermined length for each lot. After being cut, they are stacked at a certain height by the stacker 18 and sequentially discharged.

In such a corrugator machine, 1
Two roll-shaped base papers are mounted on one mill roll stand, and a cardboard sheet is continuously produced by splicing one base paper to another base paper with a splicer.
Note that the production length of corrugated cardboard sheets required for each lot according to customer orders varies from a few m to several thousand m, and the type of corrugated cardboard sheet differs for each lot. The company continuously produces hundreds of different types of corrugated cardboard sheets per day.
Therefore, at the time of this lot switching, it is necessary to splice from one base paper to another base paper of a different type in the course of continuous operation according to the type of corrugated cardboard sheet to be produced.

In addition, even during the production of the same lot, it is necessary to splice and supply the other roll base paper of the same type before one roll base paper mounted on the mill roll stand is completely supplied. . The roll base paper to be mounted on the mill roll stand has a variety of winding lengths ranging from several m to several thousand m. Therefore, in a corrugator machine, splicing by a splicer is frequently performed at various timings, and a defect of the spliced portion occurs about 70 cm in the traveling direction each time.

In the corrugator machine, the number of corrugated cardboard sheets of a predetermined length to be produced is set in a computer in advance by setting planned dimensions such as the number of sheets and the length of each lot.
The number of sheets cut by the cut-off mechanism 17 is counted by a counter, and the production state is managed by counting the length of the base paper supplied by the mill roll stand.

The defective portion of the paper splicing portion is cut off by a cut-off mechanism 17.
Then, it is removed downward by the diverter 19 so as not to be mixed into the non-defective cardboard sheet. As described above, the defective portion is generated at an unspecified position in the traveling direction by about 70 cm, and the number of defective portions differs depending on which position of the defective portion is cut by the cut-off mechanism 17 having a predetermined size during cutting.

That is, if all of the defective portions are cut into a single corrugated cardboard sheet cut to a predetermined size by the cut-off mechanism 17 before and after the defective portion, the number of defective sheets is The number of defective sheets is two or more depending on the cutting position when cut at a defective portion.

Therefore, in the conventional apparatus, a defective portion of the paper splicing is detected by the defect detecting sensor 15 provided at an appropriate position between the bridge roll 8 and the entrance of the double facer 13, and the defective portion is detected based on this detection signal. The number of defective sheets is accurately detected by the controller of the tracking and cut-off mechanism 17.

Then, the diverter 19 is operated to remove only the defective sheet downward. When the diverter 19 is not provided, the operator manually removes the defective corrugated cardboard sheet. It should be noted that since there is a collecting mechanism 7 for storing a variable amount of single-faced cardboard 5 upstream of the bridge roll 8, even if a defective portion is detected at this upstream position, tracking of this portion is extremely difficult.

In order to compensate for the shortage of production sheets due to the above-described defect removal, the supply amount of the base paper for the shortage is increased at the upstream mill roll stand side so that a predetermined number of production sheets is accurately controlled. .

[0013]

Incidentally, the production amount (number of sheets) of corrugated cardboard sheets has a problem in that it is not always possible to obtain a planned production amount due to the following problems.

That is, the corrugated sheet manufacturing process using a corrugator machine requires that the traveling length of the paper from the mill roll stand located at the uppermost stream to the cut-off mechanism is actually 2.
It consists of a long equipment of about 00m, and the corrugated cardboard sheet produced by the base paper sent from the mill roll stand is cut by the cut-off mechanism and is already the first mill roll before it comes out as the first one. At the stand, base paper of 200 m or more is fed.

At the time when the defective portion generated at the upstream position due to the splicing is discharged from the cut-off mechanism, even if the control operation is performed so as to increase the supply of the base paper by the length of the defective portion removed, In the mill roll stand, switching to the type of roll base paper corresponding to the next lot that has been set continuously has already been performed, and the operation of increasing the base paper supply of the previous lot may not be in time. Because there is.

As described above, in the conventional production management method, the remaining length (hereinafter referred to as the remaining supply length) of the lot which needs to supply the rolled base paper mounted on the upstream mill roll stand is referred to as a splicer or the like. When the paper staying length (hereinafter referred to as the staying length) between the upstream base paper supply unit and the downstream cut-off mechanism is less than or equal to a defective part due to the splicing operation at the mill roll stand However, it is impossible to compensate for the number of production sheets removed due to the occurrence of the defective portion, resulting in a problem of insufficient production.

An object of the present invention is to provide a method for managing the production of a corrugator machine which can solve such a problem and can secure a planned production volume.

[0018]

As a means for solving the above problems, the present invention provides a downstream of a corrugator machine for forming a corrugated board sheet by laminating a plurality of base papers supplied from a base paper supply section provided upstream. In the method of managing the production of corrugated cardboard sheets based on the cutoff signal from the cutoff mechanism provided in, the residual length in the lot during production that needs to supply the base paper from the base paper supply unit is cut from the base paper supply unit. After the retention length to the off mechanism is less than or equal to
When a splicing signal is generated in the base paper supply unit, the control is performed so that the reduction of the remaining length is temporarily stopped based on the splicing signal until the lot change signal is output, and the defective portion due to the splicing is removed. The production control method of the corrugator machine replenishes and supplies the base paper of a length corresponding to the length from the base paper supply unit.

In the above production management method, management is performed over the entire length of the corrugated cardboard sheet to be produced for each lot, paying particular attention to changes in the remaining supply length at the upstream base paper supply section.

In the corrugator machine, the running length of the paper from the upstream raw paper supply unit to the downstream cutoff mechanism is several hundred meters, and the head of the raw paper supplied from the raw paper supply unit passes through the cutoff mechanism. When discharged as a corrugated cardboard sheet, several hundred meters of base paper have already been fed out in the base paper supply section.

Therefore, the same production control method as before can be performed until the remaining supply length becomes equal to or less than the staying length, but after the remaining supply length becomes equal to or less than the staying length, the shortage of base paper due to splicing is supplemented. Even if an attempt is made to process the paper, the base paper supply unit has already been switched to the state of supplying the next lot of base paper, so replenishment cannot be completed in time, and the shortage of base paper cannot be replenished by the same production management method as in the prior art. Perform production management.

In this production management method, after detecting that the remaining supply length has become equal to or less than the staying length, it is checked whether a splicing signal has been input, and if this splicing signal is detected, a defective portion caused by the splicing signal is detected. Therefore, before the lot change signal is output, the length corresponding to the amount of the defect removed is added while continuing to supply the same base paper in the base paper supply unit based on the paper splicing signal. In this case, as a method of stopping the reduction of the remaining supply length, the counting for increasing the residence length or the production length by the length corresponding to the length of the defect removed is temporarily stopped, or the base paper setting corresponding to the production length of one lot is set. A stop can be implemented by adding to the length.

As a result, the decrease in the remaining supply length is temporarily stopped from the mathematical expression, and a non-defective corrugated cardboard sheet corresponding to the defect removal is produced with the increased base paper supply length to obtain the expected production amount. is there.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. The overall schematic configuration of the corrugator machine to which the embodiment of the present invention is applied is the same as that of the conventional example, and a detailed description thereof will be omitted.

FIG. 1 is a schematic block diagram of a control circuit for implementing a production management method for a corrugator machine according to the present invention.
(B) A graph of the relationship between the remaining supply length and the production length at each production stroke position, and FIG. 2 is a schematic block diagram of a control circuit.

In FIG. 1, 1a, 2a and 10a are splicers, 6a and 8a are running amount measuring sensors by measuring rolls, 15 is a defect detecting sensor and 17a is a cutoff sensor, all of which are connected to the control unit 20. Has been done. As shown in FIG. 2, in the control unit 20, the number of corrugated board sheets produced by the signal from the cut-off sensor 17a is counted by the production quantity counter 21, and the traveling amount measuring sensor 6a at the entrance of the single-sided corrugated board collecting mechanism 7 is used. The storage amount is counted by the storage counter 22 according to the difference between the travel amount measuring sensor 8a on the outlet side and the travel amount measuring sensor 8a on the outlet side.

Each of the above-described splicers 1a, 2a, 10a
And the signals from the production number counter 21 and the storage counter 22, the arithmetic control unit 23 calculates the production quantity as before, and based on the calculation result, the splicers 1a, 2a, 10a, etc. at each stroke position respectively. A necessary signal is sent in accordance with the base paper supply stage of (1), and production control for each lot is performed.

When a signal from the defect detecting sensor 15 is input to the arithmetic and control unit 23, a defective portion is tracked by a signal from the travel distance measuring sensor 21a, and a signal is sent to the diverter 19.
This defective portion is removed by the operation of.

However, as will be described later, for example, when the remaining supply length supplied from the mill roll stand 1 becomes equal to or less than a predetermined value, the output of the detection signal of the traveling distance measuring sensor 6a on the entrance side to the control unit 20 is temporarily stopped. This sensor 6
The operation control unit 2 is connected to a gate 6b provided in the middle of the detection line of FIG.
A line for sending a signal from the 3 is provided.

The result of the operation performed by the operation control section 23 is displayed on a display 24 every moment, and when a failure detection signal from the failure detection sensor 15 is inputted, the result of the removal of the insufficient corrugated cardboard sheet is obtained. Control is performed to increase the supply amount of base paper at each mill roll stand so as to recover the length. The details will be described later.

The production management is carried out as follows by the production management apparatus of the embodiment having the above configuration.

While counting the signal of the cut-off sensor 17a which is activated each time the corrugated cardboard sheet is cut by a predetermined size in the cut-off mechanism 17, it is checked whether or not the production amount (the number of products) of the corrugated cardboard sheet has reached the target quantity of each lot. When the base paper supply length at each mill roll stand reaches the target length for each lot, a signal is sent to the splicer in order to perform a lot change or a signal for switching the setting of the slitter / scorer 16. Production control has been conventionally performed by a corrugator machine.

Although the general production management as described above is also performed in this embodiment, the characteristic of the production management of the corrugator machine in this embodiment is that the production quantity for each lot is particularly reduced to the target quantity. As the distance approaches, the remaining length (supply remaining length) required to supply the rolled base paper mounted on the mill roll stand 2 at the upstream position in order to satisfy the target quantity becomes 0 from the above-described state of the remaining length. In the meantime, the splicing operation is performed by the mill roll stand 2, and when a defective portion of the corrugated cardboard sheet occurs due to this, the supply length of the base paper corresponding to the removal of the defective portion is insufficient for each lot. In addition, since the production amount of the corrugated cardboard sheet is insufficient, there is a function of controlling production so that extra base paper having a length corresponding to the shortage is supplied and fed.

The following description is made with reference to FIGS. 1 and 3. In order to make the explanation easy to understand, a roll-shaped base paper having a winding length of 2000 m is set on the mill roll stand 1, a roll-shaped base paper 2A of 900 m is set on the left side of the mill roll stand 2, and a roll-shaped base paper 2B of 800 m is set on the right side. In the mill roll stand 2, it is assumed that the roll base paper 2A on the left side is sent out first, and the roll base paper having a winding length of 1500 m is set in the mill roll stand 10. The cardboard sheet cut to a predetermined size by the cut-off mechanism 17 is 1 m × 10
00 sheets = 1000 m, which is taken as one lot production length.

When the base paper is sent out from each mill roll stand and the production of the corrugated cardboard sheet is started, the production control is also started by the production control device at the same time. Is set, the set value of the production number counter 21 is preset. As the preset value, the cutting length (m) of the corrugated cardboard sheet in the lot to be produced × the number of sheets produced = the set length of the base paper (production length of one lot) (m) is preset.

[0036] In the flowchart of FIG. 3, the production control is started, is performed above the preset in step S _1, the supply remaining length of the paper splicing point from one of the rolled sheet in step S ₂ to the other ( A comparison determination is made between the remaining splice supply length and the residence length. However, this determination is based on the mill roll stand 2 having the splicer 2a.
It is a judgment in.

The splice supply remaining length is computed production length in the calculation control unit 23 based on the signal production number counter 21 in step S ₃ If more retention length. Then, in step S ₄ , the production length is subtracted from the base paper set length (1 lot manufacturing length) set in the splicer 2 a, and it is determined in step S ₅ whether the remaining supply length in the splicer 2 a is 0. To be done. The above arithmetic processing is represented by the following equation.

The supply remaining length = sheet set length - unless (Production length + dwell length) (1) supplying the remaining length by the above equation is 0, the same processing returns to step S ₂ is repeated. When the supply remaining length is 0, the lot change command is output from the production control apparatus proceeds to step S _6.

While the above-described general production control is being performed, the supply of base paper at each mill roll stand proceeds, and the remaining supply length gradually decreases. The progress is shown in the graph of FIG. At the moment when the first sheet (= 1 m) of the corrugated cardboard sheet is produced after passing through the cut-off mechanism 17, the residence length is 20 as shown in FIG.
0 m, the remaining supply length is 10 in the mill roll stand 2.
It can be seen that it has decreased to 00m- (1m + 200m) = 799m. Also, at this time, when the remaining supply length is viewed at the position of the mill roll stand 10, the residence length is 50 m, which is 949 m as shown in the intermediate position.

As described above, when the remaining supply length at the mill roll stand 2 is equal to or longer than the retention length (200 m) at the initial stage, the splicing is performed from one roll base paper to the other, and the defective portion is cut. Even at the time of cutting by the off mechanism 17, the roll base paper of the same lot is still being supplied by the mill roll stand 2, so that the short supply length due to the removal of the defective portion can be compensated as before. .

However, only by the conventional production management, the production length of the corrugated cardboard sheet progresses and the production length increases as the base paper is sent out from the mill roll stand 2, and the remaining supply length at this position is the retention length. At a certain distance of 200 m or less, the following problem occurs.

That is, when the remaining supply length becomes equal to or less than the retention length (200 m), the splicing of the lot being produced is performed.
When the defective portion is cut by the cut-off mechanism 17, the mill roll stand 2 is switched to the roll-shaped base paper for the next lot production, and the short supply length due to the defect can be compensated. Shortage of production. Already supply the remaining length of the mill roll stand 2 at that time is after became 0, is after the lot changes in mill roll stand 2 lots change command is output in step S ₆ as described above is performed.

As shown in FIG. 1, when the base paper is fed from the roll base paper 2A having a winding length of 900 m, the remaining splice supply length when the next splicing to the roll base paper 2B is necessarily the staying length. It is 200 m or less.

Therefore, such a remaining supply length is the residence length (2
00m), the following production management is performed. That is, the process proceeds from step S ₂ in the flowchart of FIG. 3 to step SS _1, where the detection of the splice signal is performed.

[0045] When splicing signal is not detected, but immediately returns to step S ₃ back to a later procedure, if the splice signal is detected, step SS in the time
_{In 2} , the count addition from the travel distance measuring sensor 6 a to the storage counter 22 is stopped by the length corresponding to the length considered to be insufficient due to the removal of the defective portion. This addition is stopped by sending a stop signal from the arithmetic and control unit 23 to the gate 6b of the travel distance measuring sensor 6a in the block diagram of FIG.

Note that the length corresponding to the shortage may be at least a length that can secure the number of orders ordered by the customer.

At this time, the addition signal from the travel distance measuring sensor 6a is stopped while the subtraction signal from the travel distance measurement sensor 8a is input to the storage counter 22, so that the storage by the accumulation mechanism 7 is calculated from the equation. The amount will be reduced, resulting in a reduced residence length.

However, during this time, the production length increases by an amount corresponding to the decrease in the residence length, so that the remaining supply length does not decrease in the equation (1). Actually, since the base paper is supplied from the mill roll stand 2 and the single-faced corrugated board 5 is sent to the pooling mechanism 7, the base paper corresponding to the insufficient length is supplied.

As described above, while the stop signal is input to the gate 6b of the travel distance measuring sensor 6a to stop the reduction of the remaining supply length, the refill length of the base paper from the mill roll stand 2 becomes
If it runs out of equivalent again returns to step S ₄ performs subsequent processing.

[0050] Further, the calculation of the production length at Step S ₃ even when detecting splice signal in step SS ₁ has to proceed. In this case, the production length is calculated on the assumption that the defect removal length is excluded.

[0051] Then calculating the supply remaining length in step S _4, the supply remaining length between the first but not decrease, decreases eventually. Then, performs determination of the feed remaining length in step S _5, the lot change command is issued in step S ₆ the supply remaining length is zero.

FIG. 4 is a graph showing the situation of the production control performed as described above. (A) shows a change in the supply remaining length, and (b) shows a change in the supply length of the base paper in the lot 1 when there is no splice failure in the base paper of the lot 1 and when a failure occurs. ing.

As shown, the remaining supply length decreases as the production time of the corrugated cardboard sheet elapses. If the splice signal is input while the remaining supply length is longer than the stay length, the supply of the base paper is replenished by a conventional production management method.

When the splicing signal is generated at any timing within the range in which the supply of the base paper is replenished according to the present invention until the remaining supply length becomes equal to or less than the staying length and becomes zero, a splice signal is generated as shown in the drawing. The reduction of the length is stopped while supplying the base paper for the length corresponding to the defect removal length by the splice, and when the supply of the base paper is replenished, the remaining supply length is reduced again. (B) In the figure, it can be seen that the supply length of the base paper is extended by the defect removal length.

In the corrugator machine, since the corrugated cardboard sheets are continuously produced, the remaining supply length gradually decreases in the above equation (1). However, in the above embodiment of the present invention, the addition to the storage counter 22 is performed. By stopping the signal for a length corresponding to the length removed by the defect, the control unit 20 performs arithmetic control to supply the shortage of the base paper so that the staying length is apparently reduced by the length and the change in the remaining supply length is stopped. Like that.

In order to supply a base paper having a length corresponding to the shortage due to the removal of defects, a production management method in which arithmetic control is performed so as to temporarily stop the decrease in the remaining supply length, which is supposed to gradually decrease, in a mathematical expression. Any method may be used.

For example, the gate 6b of the travel distance measuring sensor 6a is not provided as in the above-described embodiment, and as shown by the broken line in FIG. A gate 17b may be provided to stop counting for the number of defective pieces removed. In this case, since the production length does not increase by the length corresponding to the defect removal length in the above-described formula (1), the remaining supply length does not decrease, so that the shortage of the base paper can be supplemented.

Further, as another method, the storage counter 2
No gate is provided in the middle of the input signal path of 2 or the number-of-productions counter 21, and the remaining amount of supply that should be reduced by adding the insufficient length to the set length of base paper in order to compensate for the shortage of base paper. Control may be performed to temporarily stop the change in length.

[0059]

As is apparent from the above description, in the production management method of the present invention, the remaining length required to supply the base paper from the base paper supply unit is less than the stay length from the base paper supply unit to the cut-off mechanism. Then, by temporarily stopping the reduction of the remaining supply length, the base paper having a length corresponding to the defect removal amount is replenished before the lot change signal is output, so even if a defective portion due to paper splicing occurs. The advantage is obtained that the production amount can always be ensured by a relatively simple method.

[Brief description of the drawings]

FIG. 1A is an overall schematic view of a production management device according to an embodiment;
(B) Illustration of remaining supply length and production length

FIG. 2 is an overall schematic block diagram of a production management device.

FIG. 3 is a flowchart of production management.

4A is a diagram illustrating a change in remaining supply length, and FIG. 4B is a diagram illustrating a base paper supply length in a lot.

FIG. 5 is an overall schematic configuration diagram of a corrugator machine.

[Explanation of symbols]

 1 Mill Roll Stand 2 Mill Roll Stand 3 Heater 4 Single Facer 5 Single-sided Cardboard 6 Transfer Conveyor 7 Collection Mechanism 8 Bridge Roll 9 Heater Heater 10 Mill Roll Stand 11 Glue Machine 12 Roll 13 Double Facer 14 Corrugated Cardboard Sheet 15 Defect Detection Sensor 16 Slitter・ Scorer 17 Cut-off mechanism 18 Stacker 19 Diverter 20 Control unit 21 Production number counter 22 Storage counter 23 Arithmetic control unit

Claims (1)

[Claims] 1. Based on a cut-off signal from a cut-off mechanism provided downstream of a corrugator machine that forms a corrugated board sheet by laminating a plurality of base papers supplied from a base paper supply unit provided upstream. In the method of managing the production of corrugated cardboard sheets for each lot, the residual length (hereinafter referred to as the residual supply length) in the production lot that needs to supply the base paper from the base paper supply unit stays from the base paper supply unit to the cutoff mechanism. When a splicing signal is generated in the base paper supply unit after the length is less than or equal to the length, the arithmetic control is performed so that the reduction of the remaining supply length is temporarily stopped based on the splicing signal until the lot change signal is output. A production control method for a corrugator machine, comprising replenishing and supplying a length of base paper corresponding to a removal length including a defective portion due to paper splicing from a base paper supply unit.