JP2000264506A - Winding method and device for coated paper after supercalender process - Google Patents

Abstract

PROBLEM TO BE SOLVED: To establish a winding method and device for coated paper after being subjected to a super-calender process capable of winding up the coated paper having a thickness after super-calender process of below 80 μm and a Bekk smoothness of over 1500 sec in good condition into a coil of 2-4 m in diameter in a paper mill. SOLUTION: The revolving speed of a deflector roll 10 installed ahead of the device is measured by a measuring instrument 10a for the revolving speed of a deflector roll, and the paper speed is calculated by multiplying the obtained value by the radius of the deflector roll 10, and the obtained paper speed is divided by the revolving speed of a winding shaft 2 measured by a winding shaft revolving speed measuring instrument 2a, and the radius of the paper 1 wound on the winding shaft 2 is determined, and until the radius attains 20 cm from the winding shaft 2, the nip pressure is controlled to a specified value over 3 kg/cm, and if the radius exceeds 20 cm from the shaft 2, the nipping pressure is decreased gradually till the end of winding so that the nipping pressure at the end of winding becomes a specified value below 2 kg/cm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for winding a coated paper having a thickness of 80 .mu.m or less and a Beck smoothness of 1500 seconds or more in a paper mill at a diameter of 2 to 4 m in a paper mill. The present invention relates to a method for winding coated paper after a super calendering process, and an apparatus suitable for carrying out the method.

[0002]

2. Description of the Related Art In general, printing paper is often subjected to a super calender treatment to improve printability after being made on a paper machine at a paper mill, thereby imparting smoothness to the paper surface. Then, the paper subjected to the super calendering process is wound into a coil at the exit of the super calendering machine by a winding device. The coating after the super calendering process has a thickness of 80 μm or less and a Beck smoothness of 1500 seconds or more. When attempting to wind the paper into a large diameter, there is a problem that the paper is cut near the winding shaft due to the thinness of the paper and the improvement of the smoothness by the super calendering process.

That is, when the paper subjected to the super calendering process is wound into a coil shape by a winding device at the exit of the super calendering machine, the winding is terminated when the coil diameter of the wound paper reaches a predetermined diameter. When the winding is completed, the coil of the winding paper is rotated to prepare for the next winding and to change the winding paper to a coil having a predetermined diameter used in a printing factory when the winding paper is newspaper. Must be stopped. However, since the coil of the wound paper is rotating at a high speed immediately after the end of the winding, it is necessary to apply a brake and stop suddenly in order not to delay the preparation of the next winding step and the rewinding step.

However, when the coil of the paper roll is braked and suddenly stopped, paper breakage or slip wrinkling often occurs inside the coil of the paper roll. for that reason,
It was necessary to take measures such as gradually stopping the coil of the paper roll, which significantly reduced the productivity of the paper machine.

When the above-mentioned paper breakage phenomenon is examined in detail, the paper breakage phenomenon hardly occurs when the wound paper is a coated paper having a thickness of more than 80 μm after the super calendering treatment because the paper has sufficient strength. However, when the thickness after super calendering is 80 μm or less, the frequency increases as the coil diameter of the wound paper increases. It has been found that the frequency of occurrence of higher paper winding is higher than that of paper having lower Beck smoothness. In addition, there is a characteristic in a position where a sheet break is likely to occur.
It has also been found that a large amount of this occurs at a position near the winding shaft of 15 cm. From such knowledge, when the coil of the winding paper is stopped suddenly during high-speed rotation, a large torque is applied near the winding shaft, and the large torque causes a slip between the papers near the winding shaft to cause a paper break. It is speculated that this will happen.

As measures to prevent this paper breakage, it is conceivable to lower the winding speed or reduce the brake capacity. However, such measures reduce productivity, so that the problem is solved. It is not preferable as a means. Also, increase the coefficient of friction between the webs,
It is conceivable to increase the strength of the rolled paper, but this cannot be adopted because it changes the characteristics of the paper itself.

Further, the frictional force on the surface of the paper roll is proportional to the pressure applied to the paper surface. Therefore, if the paper is wound tightly, the frictional force between the paper rolls increases, and the paper should not slip easily. Also, looseness of the paper roll inside the coil of the paper roll, such as paper wrinkles, may cause slippage between the paper rolls, but tightly winding the paper roll may eliminate paper wrinkles, which cause slippage. Conceivable. However, in order to wind the paper tightly, the paper must be wound with great tension.
The larger the width of the wound paper, the more the difference in elongation of the paper appears in the width direction based on the unevenness in the width direction of the paper, so that the wound coil has irregularities in the width direction of the paper. , The subsequent printing adequacy deteriorates, and particularly when the subsequent printing is gravure printing, it becomes a fatal defect.

Therefore, the present inventors considered a method of increasing the nip pressure by a touch roll that comes into contact with the paper roll, instead of applying a large tension to the paper roll, in order to wind the paper tightly. 2 widely used from
In a drum-type winder, the larger the diameter of the wound coil, the greater the weight of the coil.Therefore, the nip pressure increases in proportion to the weight of the coil, and the nip pressure in the vicinity of the winding shaft where paper breakage easily occurs. Therefore, it is not possible to prevent the occurrence of slip between sheets near the take-up shaft.

[0009] As a winding device capable of solving such problems, it is usually installed at the outlet of a super calender machine, and is used at an initial stage of winding paper on a winding shaft. There is a soft nip winder device that can change the pressing force by a touch roll so that the film can be wound by pressure.

The feature of this soft nip winder is that, at the beginning of winding (also called lower winding), it is easy to wrinkle, so that it is usually wound with a high nip pressure of 0.5 to 0.6 kg / cm, and the winding diameter is large. As a result, the nip pressure of the upper winding, which is the winding following the lower winding, is set to 0.1 to 0.3 kg / c.
m, so that it can be rolled softly while slightly entraining air. The reason is that if the upper winding is wound tightly, it is impossible to prevent the paper from being pulled in the width direction and the winding paper from becoming uneven in the width direction.

This soft nip winder is shown in FIG.
As shown in FIG. 1, a touch roll 5 is brought into contact with a winding paper 1 wound around a winding shaft 2, and the winding paper 1 is wound by applying a nip pressure by applying pressure with the touch roll 5. The upper end of a pressure arm 6 to which both ends of a rotary shaft 5a are pivotally mounted is pivotally mounted like a pendulum to a carriage frame 4 which can move in the direction of the winding shaft 2. Are connected to an air cylinder 7 mounted on the carriage frame 4, and the pressing force of the air cylinder 7 presses the touch roll 5 against the paper roll 1, thereby forming a nip between the paper roll 1 and the touch roll 5. Is pressed.

[0012] The carriage frame 4 is moved so that the nip portion of the touch roll 5 is constantly pressed against the web 1 by the rodless cylinder 8.
It is pressed in the direction of. When the take-up diameter increases during the take-up of the take-up paper 1, the press arm 6 of the touch roll 5 tilts, and the position sensor 6 a attached to the tip of the press arm 6 detects the inclination and detects the servo motor 9. When the servo motor 9 is driven to rotate the screw shaft 8a of the rodless cylinder 8, the nut 8b made of gunmetal moves backward by the thickness of the web 1.
Since the gunmetal nut 8b is fixed to the carriage frame 4, the carriage frame 4 retreats together with the gunmetal nut 8b.

As described above, the rodless cylinder 8 has a role of pressing the touch roll 5 in the direction of the web 1 so that the nip portion of the touch roll 5 is constantly pressed against the web 1. However, since the air cylinder 7 that presses the rotation shaft 5a of the touch roll 5 toward the paper roll 1 also presses the nip portion, the rodless cylinder 8 is not necessarily required. However, if the rodless cylinder 8 is not provided, the touch roll 5
The pressurizing force for pressurizing the nip portion is directly applied to the gunmetal nut 8b and the screw shaft 8a, and the durability of the gunmetal nut 8b and the screw shaft 8a becomes a problem. Therefore, the rodless cylinder 8 is provided to alleviate the problem. Often.

In the soft nip winder having such a structure, the winding paper 1 is prepared for the next winding as soon as the coil diameter of the winding paper 1 reaches a predetermined diameter and the winding is completed. In such a case, the rotation of the coil of the web 1 must be stopped in order to rewind to a coil having a predetermined diameter used in a printing factory. The rotation of the coil of the winding paper 1 is stopped because the coil of the winding paper 1 is rotating at a high speed immediately after the end of the winding so that the preparation of the next winding step and the rewinding step are not delayed. The stop must be a sudden stop with the brake applied. If the stop is abruptly stopped, if the thickness after the super calender processing is 80 μm or less, paper breakage or slip wrinkles may occur inside the coil of the web 1. Therefore, it is necessary to take measures such as gradually stopping the coil of the winding paper 1, and the productivity of the paper machine has been remarkably reduced. As measures to prevent this paper breakage, reducing the winding speed or reducing the brake capacity
Since the productivity is reduced, the problem cannot be solved as in the case of the conventional two-drum type winder.

[0015]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and reduces the productivity of coated paper having a thickness after supercalendering of 80 μm or less and a Beck smoothness of 1500 seconds or more. It is an object of the present invention to provide a method and an apparatus for winding coated paper after super calendering, which can be wound well in a coil of 2 to 4 m without performing the above operation.

[0016]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, the conventional soft nip winder has a lower winding nip pressure of usually 0.5 to 0.6 kg / kg.
cm, so that suddenly stopping the coil of the winding paper during high-speed rotation, a slip occurs between the upper winding and the lower winding due to a large torque applied near the winding shaft, and it is considered that the paper break occurs. We considered increasing the nip pressure of the lower winding. However, in addition to the problem of how much the nip pressure of the lower winding should be increased and how large the diameter of the lower winding should be to prevent paper breakage, the nip pressure of the upper winding And how to reduce the nip pressure of the upper winding suddenly to a nip pressure smaller than the nip pressure of the lower winding like a conventional soft nip winder As a result, when a coated paper having a thickness of 80 μm or less and a Beck smoothness of 1500 seconds or more after supercalender processing is wound into a coil having a diameter of 2 to 4 m, a deflector roll installed in front of the winding device Is measured by a deflector roll rotational speed measuring device, and the rotational speed is multiplied by the radius of the deflector roll to calculate a paper speed. The radius of the paper wound on the winding shaft was determined by dividing by the rotation speed of the winding shaft of the device measured in the above, and the nip pressure was maintained until the determined radius reached 20 cm from the winding shaft. When the radius exceeds 20 cm from the winding shaft, the nip pressure is gradually reduced until the end of winding so that the nip pressure at the end of winding becomes a predetermined force of 2 kg / cm or less. I found out what I need to control.

As a device suitable for carrying out the method of the present invention, both ends of a rotary shaft of a touch roll for applying a nip pressure in contact with a paper wound on a winding shaft are pivotally mounted. The upper end of the pressurizing arm is pivotally mounted like a pendulum on a carriage frame that can be moved in the winding axis direction by a rodless cylinder, and both ends of the rotating shaft of this touch roll are mounted on an air cylinder mounted on the carriage frame. The servo motor is driven by a signal sent from a position sensor attached to the tip of the pressure arm which detects that the take-up diameter of the take-up paper has increased and the pressure arm of the touch roll has tilted. Is driven to rotate the screw shaft of the rodless cylinder so that only the thick paper roll is retracted by the carriage frame. A deflector roll installed in front of the device, the rotation speed of which is measured by a deflector roll rotation speed measuring device, and the rotation speed is multiplied by the radius of the deflector roll to calculate the paper speed. Until the radius of the paper wound on the winding shaft obtained by dividing by the rotation speed of the winding shaft measured by the winding shaft rotation speed measuring device reaches a predetermined length from the winding shaft. Controls the nip pressure to a predetermined pressure of 3 kg / cm or more, and when the radius exceeds a predetermined length from the winding shaft, gradually reduces the nip pressure until the end of winding to reduce the nip pressure at the end of winding to 2
In the case of a structure having a control device for controlling the pressure to a predetermined pressure of not more than kg / cm, coated paper having a thickness of not more than 80 μm and a Bekk smoothness of not less than 1500 seconds after super calendering has a diameter of not less than 1500 seconds. The present inventors have completed the present invention by finding that the above-mentioned problem can be solved by being able to be wound well on a coil of about 4 m in length.

That is, the pressing force of the lower winding touch roll is set to 3 kg / cm, which is significantly higher than the maximum nip pressure of 0.6 kg / cm in the conventional soft nip calender.
The above-mentioned predetermined force is controlled, and the winding radius of the lower winding is wound beyond a position in the vicinity of the winding shaft of 5 to 15 cm from the winding shaft, which is a position where the paper breakage is likely to occur in the conventional soft nip calender. Until the radius of the paper wound on the take-up shaft reaches 20 cm from the take-up shaft, the pressing force of the touch roll is controlled to the above-mentioned predetermined force. Instead of a constant pressure lower than the pressure, the pressure of the touch roll is gradually reduced until the end of winding, and the pressure at the end of winding is 2 kg / c.
It is controlled by the control device so that the predetermined force is equal to or less than m.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus suitable for carrying out a method for winding a coated paper after a super calender treatment according to the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory side view of one embodiment of an apparatus for winding a coated paper after a super calendering process according to the present invention, and FIG. 2 is a winding process for winding a coated paper after a super calendering process according to the method of the present invention. FIG. 3 is a view showing one embodiment of the relationship between the diameter and the pressing force of the touch roll, and FIG.
FIG. 7 is a view showing another embodiment of the relationship between the winding diameter and the pressing force of the touch roll when the coated paper after super calendering is wound by the method of the present invention.

In FIG. 1, reference numeral 1 denotes a take-up paper, 2 denotes a take-up shaft for winding the take-up paper 1 in a coil shape, 3 denotes a base, and 4 denotes a roll on a rail 3a installed on the base 3. The carriage frame 5, which is movably mounted in the direction of the take-up shaft 2, is suspended with the upper end of a pressing arm 6 to which both ends of a rotating shaft 5a are pivotally attached to the carriage frame 4 like a pendulum. The both ends of the rotating shaft 5a are connected to an air cylinder 7 mounted on the carriage frame 4, and the touch roll 5 is wound around the winding shaft 2 by the pressure of the air cylinder 7. The nip pressure is applied by pressing against the paper 1 and pressing the nip between the web 1 and the touch roll 5.

The carriage frame 4 is moved in the direction of the web 1 so that the web 1 and the nip of the touch roll 5 are constantly pressed by the rodless cylinder 8 fixed to the base 3. When the take-up paper 1 is taken up by the take-up shaft 2 and the take-up diameter increases, the press arm 6 of the touch roll 5 is inclined and attached to the tip of the press arm 6. When the position sensor 6a detects this and drives the servo motor 9 by the signal sent to rotate the screw shaft 8a,
The nut 8b made of gunmetal retreats by the thickness of the wrapping paper 1. Since the gunmetal nut 8b is fixed to the carriage frame 4, the carriage frame 4 retreats together with the gunmetal nut 8b.

As described above, the rodless cylinder 8 has a role of pressing the touch roll 5 in the direction of the web 1 so that the web 1 and the nip portion of the touch roll 5 are constantly pressed. However, since the air cylinder 7 that presses the rotating shaft 5a of the touch roll 5 toward the web 1 also presses the nip portion, the rodless cylinder 8 is not necessarily required. However, if the rodless cylinder 8 does not exist, the pressing force for pressing the nip portion of the touch roll 5 on the wrapping paper 1 is directly applied to the gunmetal nut 8b and the screw shaft 8a, and the durability of the gunmetal nut 8b and the screw shaft 8a is reduced. Therefore, it is preferable to provide the rodless cylinder 8 to alleviate the problem.

The above structure is the same as that of the above-mentioned conventional soft nip winder, but the pressing force of the touch roll 5 at the time of lower winding is changed to the apparatus for winding the coated paper after the super calender processing according to the present invention. In the above, the nip pressure of the lower winding is 3 kg / cm or more, which is the maximum nip pressure of the conventional soft nip winder for coating coated paper of 0.5 to 0.6 kg / cm.
cm, so rodless cylinder 8
In order to prevent the carriage frame 4 from retreating due to the pressing force of the carriage frame 4 being lost, the rodless cylinder 8 is set to a high pressure,
And the air cylinder 7 that presses the rotating shaft 5a of the touch roll 5 toward the wrapping paper 1 so as to apply a high pressure to the nip portion of the touch roll 5, Or a hydraulic cylinder capable of applying a high pressure is used in place of the air cylinder 7, and the rotating shaft 5a of the touch roll 5 is also made thick to withstand the high pressure, and the touch roll 5 itself is also thickened in the width direction. The difference is that the difference in the nip pressure is not increased.

Reference numeral 10 denotes a deflector roll installed in front of the winding device so as to guide the winding paper 1 to a winding shaft 2 that winds the coil into a coil shape. A deflector roll rotation speed measuring device 10a for measuring the speed is installed, and a winding shaft rotation speed measuring device 2a is also installed on the winding shaft 2 for winding the winding paper 1 in a coil shape. The rotation speed of the deflector roll 10 is measured by the rotation speed measuring device 10a, the rotation speed is multiplied by the radius of the deflector roll 10, and the paper speed is calculated.The paper speed is measured by the winding shaft rotation speed measuring device 2a. Divide by the rotation speed of the take-up shaft 2 to determine the radius of the web 1 wound on the take-up shaft 2, and keep the nip pressure at 3k until the obtained radius reaches 20 cm from the take-up shaft 2.
g / cm or more and the radius is controlled to the winding shaft 2.
When the distance exceeds 20 cm, the pressing force of the touch roll 5 is gradually reduced until the end of winding, and the pressing force at the end of winding is 2 kg / c.
A control device 11 for controlling the force to be a predetermined force equal to or less than m is provided.

The coated paper winding soft nip winder according to the present invention has a thickness of 80 μm or less and a Beck smoothness of 15 μm after super calendering.
Wrapping paper 1 made of coated paper for 00 seconds or more
In order to wind up a 4 m coil, the rotation speed of the deflector roll 10 installed in front of the apparatus is measured by a deflector roll rotation speed measuring device 10a, and the rotation speed is multiplied by the radius of the deflector roll 10 to obtain a paper speed. The calculated paper speed is divided by the rotation speed of the take-up shaft 2 measured by the take-up shaft rotation speed measuring device 2a to obtain the radius of the take-up paper 1 wound on the take-up shaft 2, and the obtained take-up When the radius of the web 1 wound around the shaft 2 reaches 20 cm from the winding shaft 2, the nip pressure is set to a predetermined force of 3 kg / cm or more, and when the radius exceeds 20 cm from the winding shaft 2. The pressure of the touch roll 5 is gradually reduced until the end of winding, and the control device 11 controls the pressing force at the end of winding to a predetermined force of 2 kg / cm or less as shown in FIGS. 2 and 3.

[0026]

According to the method for winding a coated paper after the super calender treatment according to the present invention as described in detail above, the coating after the super calender treatment has a thickness of 80 μm or less and a Beck smoothness of 1500 seconds or more. When a paper roll made of paper is wound into a coil having a diameter of 2 to 4 m, the lower roll is firmly wound without applying a large tension to the paper roll, so that a paper break occurs near the winding shaft. In addition to solving the problem that wrinkles are likely to be formed at the beginning of winding (lower winding), the upper winding also starts winding from a harder state than in the case of the conventional soft nip winder and has a large fluctuation in nip pressure. The problem that the winding paper becomes uneven in the width direction can be solved at once, and the apparatus for winding coated paper after the super calendering process according to the present invention is conventionally used. The soft nip winder is suitable for carrying out the method for winding coated paper after the super calendering process according to the present invention, which can be easily manufactured by improving the soft nip winder device and has the above-mentioned effect, and the industrial value of the present invention is as follows. Some are very large.

[Brief description of the drawings]

FIG. 1 is an explanatory side view of one embodiment of an apparatus for winding coated paper after a super calendar process according to the present invention.

FIG. 2 shows an example of a relationship between a winding diameter and a pressing force of a touch roll when winding a coated paper after a super calendering process according to the method of the present invention.

FIG. 3 is a diagram showing another example of the relationship between the winding diameter and the pressing force of the touch roll when the coated paper after the super calendering process is wound by the method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Winding paper 2 Winding shaft 2a Winding shaft rotation speed measuring device 3 Base 3a Rail 4 Carriage frame 5 Touch roll 5a Rotating shaft 6 Pressure arm 6a Position sensor 7 Air cylinder 8 Rodless cylinder 8a Screw shaft 8b Gunmetal Nut 9 Servo motor 10 Deflector roll 10a Deflector roll rotation speed measuring device 11 Controller

Continued on front page F term (reference) 3F055 AA01 BA25 EA02 EA11 FA05 FA17 4L055 BD09 BE02 CH04 DA15 DA20 DA29 DA30 EA08 EA12 EA15 FA23 FA30 GA19

Claims (2)

[Claims] 1. Thickness after super calendering is 80
When winding a coated paper having a Beck smoothness of 1500 seconds or more with a diameter of 2 μm or less into a coil having a diameter of 2 to 4 m, the rotation speed of a deflector roll installed in front of the winding device is measured by a deflector roll rotation speed measuring device. Measure and multiply the rotation speed by the radius of the deflector roll to calculate the paper speed, and divide the paper speed by the rotation speed of the winding shaft of the device measured by the winding shaft rotation speed measuring device to obtain the paper speed. The radius of the paper wound on the take-up shaft is determined, and the calculated radius is 20 mm from the take-up shaft.
cm, the nip pressure is controlled to a predetermined force of 3 kg / cm or more, and when the radius exceeds 20 cm from the winding shaft, the nip pressure is gradually reduced until the end of winding, and the nip pressure at the end of winding is 2 kg / cm. A method for winding coated paper after a super calendering process, wherein the coated paper is controlled so as to have the following predetermined force. 2. A web wound on a winding shaft (2)
The upper end of a pressure arm (6), on which both ends of a rotating shaft (5a) of a touch roll (5) that contacts (1) and applies nip pressure, is pivoted by a rodless cylinder (8). An air cylinder mounted on a carriage frame (4), which is pivotally mounted on a carriage frame (4) that can move in the direction (2), with both ends of a rotating shaft (5a) of the touch roll (5) mounted on the carriage frame (4). (7), and the fact that the winding diameter of the winding paper (1) is large and the pressing arm (6) of the touch roll (5) is inclined is indicated at the tip of the pressing arm (6). The servomotor (9) is driven by the signal detected and sent by the attached position sensor (6a), and the screw shaft (8a) of the rodless cylinder (8) is rotated to increase the thickness of the paper roll (1). A rewinding device for retracting the carriage frame (4) only in front of the device. The rotation speed of the deflector roll (10) is measured by a deflector roll rotation speed measuring device (10a), and the rotation speed is multiplied by the radius of the deflector roll (10) to calculate the paper speed. The radius of the winding paper (1) wound on the winding shaft (2) obtained by dividing by the rotation speed of the winding shaft (2) measured by the winding shaft rotation speed measuring device (2a) is The nip pressure is controlled to a predetermined pressure of 3 kg / cm or more from the winding shaft (2) to a predetermined length, and when the radius exceeds a predetermined length from the winding shaft (2), the nip is stopped until the end. A control device (11) for gradually reducing the pressure to control the nip pressure at the end of winding to a predetermined pressure of 2 kg / cm or less, and winding the coated paper after the super calender processing. apparatus.