JP2003245989A - Single facer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a single facer equipped with a pressurizing means in lieu of a belt pressurizing device, or a pressurizing means which assists in the action of the belt pressurizing device. <P>SOLUTION: This single facer works as follows: A core paper 3 is corrugated by the intermeshing rotation of a first and a second corrugated rolls 1 and 2 which are adjacent to each other, than a liner 10 is lapped over the corrugated core paper 3 on the peripheral face of the first corrugated roll 1, and the corrugated core paper 3 is adhesively attached by applying a pressure to the liner 10 with the help of the pressurizing means. The pressurizing means is equipped with an air pressure application means 30 for pressurizing the liner 10 under the action of an air pressure. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single facer for producing a single-faced corrugated board sheet, and more particularly to a pressure means for pressure-bonding a core paper and a liner.

[0002]

2. Description of the Related Art A conventional single facer has an upper roll 1 and a lower roll 2 having corrugated grooves on the outer circumference, as shown in the basic structure of FIG. This roll 1,
2 rotates in the direction of the arrow while meshing with each other, and corrugates the core paper 3 by sandwiching the core paper 3 supplied from a mill roll stand (not shown) between the nips.

Core paper 3 formed in steps by step rolls 1 and 2
Is the upper roll 1 due to the resilience and centrifugal force of the elasticity of the paper
Trying to move away from the surface of. In order to prevent this, as shown in detail in FIG. 9, the upper roll 1 has a large number of lateral holes 1a penetrating along the axial direction and arranged in an annular shape, and an appropriate pitch in the axial direction (usually 25 ˜100 mm) arranged in a narrow width (usually 1 to 2 mm) of the circumferential groove 1c, and the radial holes 1b for communicating the lateral holes 1a with the bottoms of the circumferential grooves 1c.
And are provided.

A suction box (not shown in detail) for suctioning a range roughly indicated by a chain line is arranged at a portion where the lateral hole 1a is formed on the end surface of the upper roll 1. Since the vacuum pump 20 is connected to the suction box via the pipe 21, the vacuum pressure of the lateral hole 1a reaches the surface of the corrugated roll 1 through the radial hole 1b and the circumferential groove 1c, and as a result,
The core paper 3 is adsorbed and held on the surface of the upper roll 1.

The vacuum pump 20 is not particularly limited in specifications such as type, but generally, a fan type driven by a motor having a constant rotation speed is used. When this fan type vacuum pump 20 is used, the pump 20
By providing a bypass circuit 22 for introducing air on the suction side of the, and increasing or decreasing the opening degree of a valve 23 provided in the middle of the bypass circuit 22, that is, by changing the intake amount of air into the pipe 21. Adjust the vacuum pressure in the pipe 21.

Referring again to FIG. A gluing device 5 is arranged opposite to the side of the upper roll 1. The gluing device 5 brings the gluing roll 6 into contact with the top of the corrugated core paper 3 to attach the glue. On the other hand, a pressure belt 8 wound around a pair of pulleys 7 is pressed against the upper roll 1. The pressure belt 8 has a width wider than the maximum paper width used in the single facer. In the following, the pressure device including the pressure belt 8 and the pulley 7 will be referred to as a belt pressure device 9.

The core paper 3 with the glue on the step top passes through the nip portion between the upper roll 1 and the pressure belt 8 together with the liner 10 supplied separately, and at this time, the core paper 3 and the liner 10
And are adhered by the pressing force of the pressure belt 8. And
The core paper 3 and the liner 10 that are stuck together become a single-sided corrugated board sheet 11 and are sent to the next step.

In the single facer, a large amount of heat is required for the step forming of the core paper 3 and the adhesion of the core paper 3 and the liner 10. Therefore, saturated steam is supplied to the inside of the corrugated rolls 1 and 2, and the core paper 3 is respectively supplied by the preheater 13 installed in the passage of the core paper 3 and the preheater 14 installed in the passage of the liner 10. And liner 10
Is supplied with heat. The preheaters 13 and 14 generate heat by the steam flowing inside.

[0009]

The above single facer has the following problems. That is, the core paper 3 and the liner 10 are attached to the upper roll 1 by the pressure belt 8.
A large pressing force is required to press and bond to.
Since this pressing force is given by the tension of the pressure belt 8, a very large tension is applied to the pressure belt 8, and therefore the life of the pressure belt 8 is extremely shortened. Further, in order to make the wide pressure belt 8 run straight under high tension without causing meandering, a complicated device and a high level of maintenance are required, and the operating cost increases accordingly. Further, it is technically difficult to press the wide pressure belt 8 with a uniform force in the width direction.

In view of such circumstances, the present invention intends to provide a single facer equipped with a pressurizing means instead of the belt pressurizing device or a pressurizing means for assisting the operation of the belt pressurizing device. It is a thing.

[0011]

SUMMARY OF THE INVENTION According to the present invention, a core paper is formed into a corrugated shape by meshing rotation of adjacent first and second corrugating rolls, and the corrugated core is formed on the peripheral surface of the first corrugating roll. In a single facer in which a liner is superposed on paper and then the liner is pressed by a pressing means to bond and bond the corrugated core paper, the pressing means applies air pressure to the liner to press it. It is characterized in that it is provided with air pressure acting means. In the present invention, the air pressure acting means may include a structure defining a closed space on the air pressure acting area, and an air supply source for supplying pressurized air to the closed space.

Further, according to the present invention, the core paper is formed into a corrugated shape by the meshing rotation of the adjacent first and second corrugating rolls, and the liner is formed on the corrugated core paper on the peripheral surface of the first corrugating roll. In the single facer in which the liner is pressure-bonded by the pressure-applying means after the layers are superposed, the pressure-applying means press-contacts the liner and the traveling belt, and the pressure-contact at the belt. Air pressure acting means for applying air pressure to pressurize the back surface of the portion is provided. In the present invention, the air pressure acting means is
The structure may define a closed space on the air pressure acting area, and an air supply source for supplying pressurized air to the closed space.

The structure can be configured so that the width of the first roll in the direction along the axis can be changed. Further, it further comprises an actuator that changes the width of the structure, and a control unit that controls the actuator so that the width of the structure conforms to the paper width based on the paper width of the core paper or liner. it can. In this case, a paper width detecting means for detecting the paper width may be provided.

The air pressure acting means may include air pressure adjusting means for adjusting the air pressure. The air pressure adjusting means may be configured to adjust the air pressure based on the basis weights of the core paper and the liner. Further, the air pressure adjusting means is provided with a bonding failure detecting means for detecting bonding failure between the core paper and the liner, and when the bonding failure detecting means determines a bonding failure, the air pressure is preset. The pressure may be increased by a predetermined pressure.

The air pressure acting means may be constructed so as to generate the air pressure by utilizing exhaust of a vacuum pump that exerts a suction force for sucking the core paper on the surface of the first corrugating roll. . It is also preferable that the structure is provided so as to be able to come into contact with and separate from the first corrugating roll in order to facilitate paper passing or maintenance.

Seal rolls are arranged in parallel and adjacent to one side and the other side of the first step roll, which are the start end and the end of the air pressure acting area, respectively, and the respective seal rolls seal the constituents. May be improved. Further, the seal rolls may be pressed against the first corrugating roll, and the core paper and the liner may be passed between the seal rolls and the first corrugating roll to apply pressure. Further, in the air pressure acting area, an auxiliary pressure roller means for pressing the liner from the surface opposite to the bonding surface directly or indirectly from above the belt to the peripheral surface side of the first step roll. Alternatively, one or more may be provided separately.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1 FIG. 1 shows Embodiment 1 of a single facer according to the present invention.
FIG. In addition, in FIG.
Elements common to those shown in FIG. 8 are designated by the same reference numerals. This single facer is provided with an air pressure mechanism 30 instead of the belt pressure mechanism 9 shown in FIG.

As shown in FIG. 2, which is a sectional view taken along the line AA of FIG. 1, side plates 32 are provided inside the respective frames 31 which are erected on the left and right sides. These side plates 32
Can be slid vertically along the guide 33, and can be moved vertically by a cylinder 34 fixed to the frame 31.

Each side plate 32 rotatably supports a pair of parallel seal rolls 35. As shown in FIG. 1, these seal rolls 35 are positioned so as to be in contact with the corrugating roll 1 or to be extremely close to each other so that their axial centers are included in horizontal planes including the axial center of the corrugating roll 1. As described above, the corrugated rolls 1 are arranged in parallel on one side and the other side, respectively.

A hood 37 covering the upper half of the upper roll 1 is arranged between the side plates 32. This hood 3
7 has a substantially inverted U-shaped cross section, and is fixed to the inner surface of each side plate 32 so that the lower end edges of one and the other are extremely close to the one and the other seal rolls 35, respectively. A screw shaft 40 is rotatably attached to the side plate 32. The screw shaft 40 is formed with screw portions 40a having different orientations at left and right symmetrical positions thereof.
The boss portion 41a of the seal plate 41 is screwed into each a. Each seal plate 41 is formed so that its upper end and both side ends slidably contact the inner surface of the hood 37, and its lower end edge approaches the corrugated roll 1 and the seal roll 35.

A motor 43 is supported on the outer side of the side plate 32 via a mount 42. Since the power of the motor 43 is transmitted to the screw shaft 40 via the coupling 44, driving the motor 43 causes the seal plates 41 to move in a direction of approaching or separating from each other.

A paper width detection device 50 is provided near the liner entrance into which the liner 10 is loaded. As shown in FIG. 4, the paper width detecting device 50 includes a pair of photoelectric tubes 51 and 52 provided extremely close to each other in the width direction of the liner 10.
Is equipped with. Although not shown in detail, the paper width detection device 50
Is attached so as to be movable in the width direction of the machine, and its position is detected by position detecting means such as a rotary encoder (not shown).

The paper edge detection device 50 sends a detection signal indicating the presence or absence of paper to the single facer control device 56 while moving in the width direction of the machine. The control device 56 controls the one photocell 51
Does not detect the paper, and the other photoelectric tube 52 detects the paper at the position where the paper is detected, and the position of the paper edge is recognized by the rotary encoder or the like. In this embodiment, the paper edge detection devices 50 are arranged on the left and right as shown in FIG. 4, so that the width of the liner 10 can be known based on the information indicating the positions of the left and right paper edges. .

In the conventional example shown in FIG. 9, means (1a, 1b, for holding the core paper 3 by suction on the surface of the upper roll 1).
1c, 20-23, etc.), such an adsorption holding means is also used in this embodiment.
In FIG. 1, the vacuum pump 20 to the upper roll 1
The pipe 60 reaching the end face portion of the above corresponds to the pipe 21 of the conventional example, and the valve 62 for adjusting the air supply amount to the pipe 60 corresponds to the valve 23 of the conventional example.

In the above conventional example, the exhaust gas of the vacuum pump 20 is discharged to the atmosphere, but in the first embodiment, the exhaust gas is supplied into the hood 37 through the pipe 61. The valve 63 is provided to adjust the amount of air flowing out from the pipe 61.

The operation of the single facer according to the first embodiment will be described below. In this single facer, a closed chamber 80 is defined above the upper half of the upper roll 1 by the hood 37, the seal plates 41 on both sides, and the seal rolls 35 on both sides, and the sealed chamber 80 is added via a pipe 61. The compressed air, that is, the exhaust of the vacuum pump 20 is sent.

On the other hand, a corrugated core paper 3 with glue on the corrugated top
Is superposed on the liner 10 at the nip portion between the upper roll 1 and one seal roll 35, and then the upper roll 1
It passes through the inside of the closed chamber 80 while being wound around the upper half of the. At this time, the air pressure in the closed chamber 80 presses the liner 10 toward the peripheral surface of the upper roll 1, so that the core paper 3 and the liner 10 are strongly abutted and bonded to each other.

As described above, in this embodiment, the core paper 3
It is possible to generate the pressing force required to bond the liner 10 and the liner 10 without using a belt pressing device. Therefore, it is possible to solve the problem when the above belt pressure device is used, that is, the problem that the pressure belt has a short life and is difficult to maintain.

Now, the position adjustment of the seal plate 41 will be described. FIG. 3 shows a state in which the core paper 3 and the liner 10 are positioned on the corrugated roll 1. As is apparent from FIG. 3, when the seal plate 41 is located on the liner 10, the gap between the lower end of the seal plate 41 (the end facing the liner) and the liner 10 is kept to a minute size. There is. However, when the lower end of the seal plate 41 is located away from the edge of the liner 10 and faces the chevron groove of the corrugated roll 1, a gap is formed between the lower end of the seal plate 41 and the valley bottom of the chevron groove. Since it is formed, air will leak out from this gap. Of course, if the seal plate 41 enters the inside of the liner 10 too much, the portion outside thereof will not be pressurized with air. Therefore, the seal plate 41 is used for the liner 10
It is desirable that the liner is always located at the end of the liner 10 even if the paper width of the liner changes.

When the vacuum pump 2 has a margin of output and a required pressing force can be obtained regardless of air leakage, it is not always necessary to adjust the seal plate 41 in the paper width direction.
The seal plate 41 may be fixed at the position of maximum paper width. However, it is generally desirable to adjust the seal plate 41 in the width direction as described above in order to prevent air leakage. The position adjustment of the seal plate 41 may be performed visually by a worker or manually based on the production data. However, it is desirable to automate the position adjustment in consideration of forgetting the adjustment and time.

An example of automation adopted in this embodiment will be described below. (1) The principle of detecting the paper edge position by the automated paper edge detection device 50 using the paper edge detection device 50 is as described above. Therefore, the control device 56 shown in FIG. 1 and FIG. 2 recognizes the paper width of the liner 10 based on the paper edge position data from each paper edge detection device 50, and determines each seal plate 41.
The drive motor 43 is controlled so that the distance between the two becomes a size that fits this paper width.

(2) Corrugated Machine The automated single facer using data from the production control device is one unit of a corrugated machine that produces corrugated board sheets. Further, the corrugated machine is provided with a production control device 57 that passes production specification data to each unit and commands operation timing. Therefore, the single facer control device 56
Receives the paper width data from the corrugating machine production control device 57, and controls the drive motor 43 so that each seal plate 41 moves to a position suitable for the paper width at an appropriate timing.

In the above embodiment, each seal plate 4
Although 1 is moved simultaneously by the common screw shaft 40, it is also possible to move each seal plate 41 by different screw shafts driven by different motors. In this case, if each seal plate 41 is positioned at a position corresponding to the paper edge position detected by each paper edge detection device 50, the respective seal plate 4
The position of 1 can correspond to the positional deviation of the liner 10 in the width direction with respect to the corrugated roll 1.

Next, the adjustment of the pressurized air source and the applied pressure will be described. (1) Pressurized air source: In the above embodiment, the hood 3
As the pressurized air supplied to the closed chamber 80 inside 7, the exhaust of the vacuum pump 20 that generates the vacuum pressure for sucking and holding the core paper 3 on the corrugated roll 1 is used. That is, the vacuum pump 20 also functions as a pressurized air source. Of course, a dedicated pump other than the vacuum pump 20 may be provided as the pressurized air source. However, if the vacuum pump 20 is also used as a pressurizing source, not only the advantage that only one pump is required can be obtained, but also another advantage that heat can be effectively used is obtained.

That is, as described in the conventional example, the corrugated roll 1 is heated by supplying steam therein. Therefore, the air sucked from the surface of the corrugated roll 1 to hold the core paper 3 is heated to a considerable temperature while passing through the lateral holes 1a. Then, this overheated air is discharged from the vacuum pump 20. As mentioned above, single facer is preheater 1
3, 14 (see FIG. 8) requires a large amount of heat to be supplied. Therefore, when the heated air exhausted from the vacuum pump 20 is used as the pressurized air source as in the above-described embodiment, the effective utilization rate of heat is improved in the single facer as a whole.

(2) Adjustment of applied pressure: Supplying air with a pressure higher than necessary into the closed chamber 80 shown in FIGS. 1 and 2 puts a heavy burden on the vacuum pump 20. Therefore, it is desirable that the air pressure in the closed chamber 80 be set to the minimum level necessary for bonding the core paper 3 and the liner 10. Therefore, in the above-described first embodiment, the opening degree of the valve 63 provided in the outlet side pipe 61 of the vacuum pump 20 is adjusted so that the necessary minimum air pressure acts in the closed chamber 80. I try to let the air escape. Generally, it is necessary to apply a high pressing force to the core paper and the liner, which are heavy in weight, when they are attached to each other. The applied pressure may be adjusted by manually operating the valve 63, but the adjustment can be automated as described below.

That is, the corrugated machine production control device 57 is input with data on the basis weights of the core paper 3 and the liner 10. Therefore, the single facer control device 56 takes in the grammage data of the core paper 3 and the liner 10 to be laminated from the corrugated machine production control device 57, and this data and the grammage-pressing force comparison table preset by simulation or the like. Based on the above, the valve opening degree for realizing the optimum pressure is determined, and the valve 63 is controlled so that the opening degree of the valve 63 becomes the determined opening degree. In addition, in this automation,
An electromagnetic valve is used as the valve 63.

The pressing force can be automatically adjusted based on the quality of the bonded state of the core paper 3 and the liner 10 in the formed single-sided corrugated cardboard sheet 11. In this case, as shown in FIG. 5, a photoelectric tube 54 for detecting a bonding failure is arranged in the exit passage of the single-faced cardboard sheet 11. When the one-sided corrugated board sheet 11 has a bonding failure due to insufficient pressure, the core paper 3 is peeled off from the liner 10, so that the thickness of the one-sided corrugated board sheet 11 is apparently increased.

The photoelectric tube 54 detects such a bonding failure based on the reflected light from the peeled core paper 3. Therefore,
The single facer control device 56 inputs the bonding failure detection signal from the photoelectric tube 54 and, at the same time, controls the valve 63 so that the pressing force increases by a predetermined value. In addition, the control of the pressing force based on the detection of the bonding failure and the above-described pressing force control based on the basis weight may be used together.

Next, each seal roll 35 will be described in more detail. Each seal roll 35 is a corrugated roll 1
It is used to improve the airtightness of the closed chamber 80 formed above. These seal rolls 35 are effective without damaging the corrugated rolls 1 and the liner 10 at the boundary portions between the one side and the other side of the corrugated rolls 1 which are the start and end of the air pressure acting area and the closed chamber 80. Can be sealed on. Further, since the seal roll 35 may be pressed and brought into contact with the corrugated roll 1 and the liner 10, this function can be positively utilized and can also be utilized as a pressing means for the core paper 3 and the liner 10. . Since the seal roll 35 can exert a high pressing force intensively (in a narrow range), it serves as an effective pressurizing assisting means for pasting and adhering the core paper 3 and the liner 10.

By the way, as conceptually shown by a chain line in FIG. 1, in the air pressure acting area, an auxiliary pressure is applied to press the liner 10 from the surface opposite to the bonding surface to the peripheral surface of the corrugated roll 1. One or more roller means 38 may be separately provided. If such pressure roller means 38 is provided in the closed chamber 80, both the pressure force by the air and the pressure force by the pressure roller means 38 are applied to the liner 10, so that the liner 10 and the core paper 3 are attached. Compatibility will be further improved.

Embodiment 2 FIG. 6 and FIG. 7, which is a sectional view taken along line BB of FIG. 6, show Embodiment 2 of a single facer according to the present invention. In the second embodiment, the belt pressing device 9 is used as in the conventional example shown in FIG. However, in the single facer of the second embodiment, the box-shaped hood 70 is provided on the back surface of the pressure contact portion of the air pressure belt 8 to the corrugated roll 1.
Is provided. Since the opening end of the hood 70 is arranged so as to be extremely close to or slightly in contact with the pressure belt 8, the hood 70 defines a closed chamber together with the pressure belt 8. In this closed chamber, the first embodiment
The pressurized air is supplied by using the same means as the pressurized air supply means shown in.

According to the second embodiment, the pressure belt 8
Since the pressure applied by the pressurized air in the hood 70 is added to the pressure based on the tension of, the tension of the pressure belt 8 can be set smaller by the amount of the added pressure.
Thereby, the life of the pressure belt 8 can be remarkably extended.

Incidentally, as conceptually shown by a chain line in FIG.
In the air pressure acting area formed by the closed chamber, one or a plurality of auxiliary pressure roller means 71 for indirectly pressing the liner 10 from above the pressure belt 8 to the peripheral surface of the corrugated roll 1 is provided. You may do it. If such pressure roller means 71 is provided in the closed chamber, the tension of the pressure belt 8 can be set smaller by the amount of the pressure applied by the pressure roller means 71. The life of 8 can be further extended.

The width of the hood 70 in the direction along the axis of the corrugated roll 1 is set so as to match the maximum paper width. As described above, since the width of the pressure belt 8 is set wider than the maximum paper width, if the width of the hood 70 is set as described above, the hood 70 can be used without using the seal plate 41 shown in FIGS. It is possible to prevent the air from leaking from the inside. The air source and the adjusting device and the adjusting method of the applied pressure thereof employed in the first embodiment can be similarly applied to the second embodiment.

[0046]

According to the present invention, air pressure is used as the pressing force required to bond the core paper and the liner. Therefore, it is possible to solve the problem when the belt pressure device is used, that is, the problem that the life of the pressure belt is short and the maintenance is difficult. Further, it becomes possible to apply a more uniform pressure as compared with the belt pressure device. On the other hand, according to the present invention in which the pressing force acting portion of the belt pressing device is pressed by the air pressure, the tension of the pressing belt can be set small and the life thereof can be remarkably improved. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing an embodiment of a single facer according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view illustrating a relative positional relationship between a core paper and a liner on a corrugated roll and a seal plate.

FIG. 4 is a conceptual diagram showing the principle for detecting the width of a liner using a phototube.

FIG. 5 is a conceptual diagram showing a principle for detecting a bonding failure using a photoelectric tube.

FIG. 6 is a conceptual diagram of a main part showing another embodiment of the single facer according to the present invention.

7 is a sectional view taken along line BB of FIG.

FIG. 8 is a cross-sectional view showing a configuration example of a conventional single facer.

9 is a partially enlarged view of the single facer of FIG.

[Explanation of symbols]

1 upper roll 1a Horizontal hole 1b Radial hole 1c circumferential groove 2 lower roll 3 core paper 8 pressure belt 9 Belt pressure device 10 liners 11 Single-sided corrugated sheet 20 vacuum pump 30 Air pressure mechanism 31 frames 32 side plate 33 Guide 34 cylinders 35 seal roll 37,70 Hood 40 screw shaft 41 seal plate 41a Boss 43 motor 50 Paper edge detector 56 Single Facer Controller 57 Colgate Machine Production Control Device 60 piping 61 piping 62,63 valves 70 Pressurizing hood

Claims (14)

[Claims] 1. A core paper is formed into a corrugated shape by meshing rotation of adjacent first and second corrugated rolls, and a liner is superposed on the corrugated core paper on the peripheral surface of the first corrugated roll. In a single facer for adhering and bonding the corrugated core paper by pressurizing the liner with a pressurizing means, the pressurizing means includes an air pressure acting means for applying air pressure to the liner to pressurize the liner. Characteristic single facer. 2. The air pressure acting means comprises a structure defining a closed space above the air pressure acting area, and an air supply source for supplying pressurized air to the closed space. Item 1. A single facer according to item 1. 3. A core paper is formed into a corrugated shape by meshing rotation of adjacent first and second corrugating rolls, and a liner is superposed on the corrugated core paper on the peripheral surface of the first corrugating roll. In a single facer for adhering and bonding the corrugated core paper by pressurizing this liner with a pressurizing means, the pressurizing means presses against the liner and runs on a belt, and on the back surface of the press-contacting portion of the belt. A single facer comprising: an air pressure acting means for applying air pressure to pressurize. 4. The air pressure acting means comprises a structure defining a closed space on the air pressure acting area, and an air supply source for supplying pressurized air to the closed space. Item 3. A single facer according to item 3. 5. The single facer according to claim 2, wherein the structure is configured so as to be able to change a width in a direction along an axis of the first stage roll. . 6. An actuator that changes the width of the structure, and a control unit that controls the actuator based on the paper width of the core paper or liner so that the width of the structure conforms to the paper width. The single facer according to claim 5, wherein the single facer is provided. 7. The single facer according to claim 6, further comprising a paper width detecting means for detecting the paper width. 8. The air pressure acting means comprises an air pressure adjusting means for adjusting an air pressure.
7. The single facer according to any one of 7. 9. The single facer according to claim 8, wherein the air pressure adjusting means is configured to adjust the air pressure based on the basis weights of the core paper and the liner. 10. The air pressure adjusting means comprises a bonding failure detecting means for detecting bonding failure between the core paper and the liner, and when the bonding failure detecting means judges a bonding failure, the air pressure adjusting means is operated. 9. The single facer according to claim 8, wherein the single facer is configured to increase the pressure by a predetermined pressure. 11. The air pressure acting means is configured to generate the air pressure by utilizing exhaust of a vacuum pump that exerts a suction force for adsorbing a core paper on the surface of the first corrugated roll. The single facer according to claim 1 or 3, characterized in that 12. The single-facer according to claim 2, wherein the structure is provided so as to be able to come into contact with and separate from the first corrugating roll in order to facilitate paper passing or maintenance. Sa. 13. A seal roll is arranged in parallel and adjacent to one side and the other side of the first stage roll, which are the start end and the end of the air pressure acting area, respectively, and the constituent rolls are formed by the seal rolls. The single facer according to claim 2, wherein the confidentiality of the single facer is improved. 14. The seal rolls are brought into pressure contact with the first stage rolls, and the core paper and liner are passed between the seal rolls and the first stage rolls to apply pressure. The single facer according to claim 13, wherein: