JP3188114B2 - Press machine for paper machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-performance press of the heating type, a calendering apparatus for a paper machine (heating rolls and pressing dry paper between the rolls to impart gloss to the paper surface and align the paper layers. The present invention relates to a press machine for a paper machine, which is applied to a press machine.

[0002]

2. Description of the Related Art The role of a press part in a papermaking process is to sandwich wet paper dehydrated to a concentration of 15 to 18% in a wire part in an upstream process with felt, or to put the paper on the felt and press it with a roll or the like. To increase the concentration to about 40 to 45% through a plurality of press stages, and to transfer to a dryer part in the next step. FIG. 3 shows an example of an entire configuration of a conventional paper machine press, and shows a wet paper 1 on which a paper layer is formed by a wire part.
Has a solids concentration of 15 to 18%, is sucked by the suction pickup roll 2, and is transferred on the pickup felt 3. And this felt 3 and 1p bottom felt 4, suction roll 5, and grooved roll 6
In a first press (hereinafter referred to as 1P) called a double felt press formed in a , the wet paper web 1 is squeezed while being sandwiched between felts 3 and 4. Next, while being sucked by the vacuum of the suction roll 5, the surface of the felt 3 is squeezed by the next second press (hereinafter referred to as 2P). 2p is called a single felt press, and is composed of a center roll 7 and a grooved roll 6b having smooth surfaces. Further, the wet paper web 1 separates from the pick-up felt 3 and is transported on the center roll 7 to be transferred to the center roll 7.
And a third press (hereinafter, referred to as 3P) composed of a grooved roll 6c and squeezed water to a solid concentration of about 35 to 40%. Next, the wet paper web 1 is put on a 4p bottom felt 8 from a paper roll 9 and pressed by a fourth press (hereinafter referred to as 4P).
After being squeezed to a concentration of 40 to 45%, it is sent to the next dryer step (not shown). 4p is composed of a top roll 10 and a grooved roll 6d.

[0003]

In a conventional press machine of a paper machine, a portion of a wet paper web, which is called an open draw portion, travels alone (in FIG. 3, the wet paper web 1 is transferred from a center roll 7 to a paper roll 9). To improve the running performance of this part, it is necessary to apply a constant draw (pulling) according to the difference in the rotation speed of the rolls. However, the strength of wet paper is significantly higher than that of dry paper. Low and always at risk of running out of paper. In the roll press, water is squeezed in the nip between the rolls, and the pressure dewatering time is also several msec to several tens m.
sec and dryness after pressing (40-45% sol
id) also had limitations. Therefore, to humidify the wet paper,
Although a steam box (steam is directly sprayed on paper) may be provided (not shown), there is a drawback that the condensation of steam increases the dehydration load or limits the temperature rise. The present invention employs a configuration in which an open draw portion is eliminated in a traveling section of a wet paper, thereby eliminating the risk of running out of paper, and increasing the dryness after pressing by heating and dehydrating the wet paper. To provide a press machine.

[0004]

SUMMARY OF THE INVENTION For this reason, the present invention provides a press machine for a paper machine, in which a wet paper web is sequentially passed through a first to a third press section and dewatered , provided with a pickup felt.
1st with suction roll and 1st bottom felt
The first press section consisting of a grooved roll and
A second press portion, which is located downstream of the first press portion and is composed of a suction roll or a second grooved roll and a solid roll constituting the first press portion, and a downstream side of the second press portion Located on the second bottom
3rd grooved roll with felt and steel veil
Comprising a third press section consists of a center roll having a belt, a, which the steel belt having heating means surrounding said center roll, the scan
Provided with a temperature sensor to the downstream side after the heating means in Chiruberuto, the steel belt is as hereinbefore provided a control device for controlling so that a predetermined temperature and said the <br/> double dip press section one The suction roll and the nip of the number press section are configured, and before rotating in contact with the steel belt
Serial solid roll is provided, further wherein third sandwiched between the second bottom felt the wet paper and the steel belt in the press section, they were arranged to press at the third groove Dror said center roll, also press As means for transferring the wet paper web from the apparatus to the downstream, downstream of the third press section
And a pickup roll that rotates in contact with the center roll. This is a means for solving the problem.

[0005]

[Function] A steel bell arranged to hold the center roll
By heating the bets heated at a wet paper contacting thereto, squeezing out water by pressing. When the wet paper is heated, the viscosity of the water in the wet paper decreases as the temperature rises, and the dewatering filtration resistance decreases.
The transfer of wet paper from the solid roll after 2P to the steel belt and the pickup roll after 3P,
All seat transfers can be made no-open draw. Subsequently, 3P can easily obtain smoothness similar to that of single felt.

[0006]

FIG. 1 shows a first embodiment of the present invention. A wet paper web 1 on which a paper layer has been formed by a wire part is sucked by a suction pickup roll 2. Pickup felt 3
It is transported along. Next, a double felt press (most pressed portion) 1P formed by the felt 3, the bottom felt 4, the suction roll 5, and the grooved roll 6a.
, The wet paper is first squeezed to a 25-30% solids concentration. Next, while being suctioned by the vacuum of the suction roll 5, the next (second press section) 2 on the felt 3
Water is squeezed with P. 2P is a single felt, which is composed of a solid roll 11 and a suction roll 5 having smooth surfaces, and the bottom side of the wet paper web is first pressed against the smooth roll,
Smoothness is ensured. Next, the wet paper web 1 on the 2P smooth solid roll 11 is pressed against a steel belt 20 looped so as to hold the center roll 7,
Transferred. The paper passing in this portion can be performed by using a doctor 13 or an air jet nozzle (not shown).

The steel belt 20 has a smooth surface, can improve the surface properties of the wet paper when the wet paper 1 is pressed together, and has a nip pressure (linear pressure of about 200 kgf / cm) with a thin plate structure.
In this embodiment, the heater 21 is heated to a predetermined temperature, for example, about 50 ° C. to 250 ° C. A temperature sensor head 22 is provided on the downstream side of the heating device 21 on the steel belt 20, and the output is controlled by a control unit 23 so as to reach a predetermined temperature. Next, after 2P, the wet paper web 1 transferred to the steel belt is squeezed with 3P. 3P is center roll 7
And a grooved roll 6b with a groove via a steel belt 20, 3P bottom felt 14. Here, the center roll 7 is covered with a heat insulating material, for example, a heat-resistant rubber material, so that heat from the steel belt 20 does not enter as much as possible. The wet paper web 1 after 3P water squeezing rides on the steel belt 20 and further receives heat from the steel belt 20, is picked up by the suction pick-up roll 12, and sent to the 4P or dryer part. If a pressure mechanism is provided, the pickup roll 12 can also use 4P instead of a suction roll. In this case, the contact point of the roll 12 can be moved, and can be arbitrarily set to a position corresponding to the speed.

As shown in FIG. 1, by heating a steel belt 20 arranged to hold the center roll 7, the temperature of the wet paper web 1 in contact with the steel belt 20 is increased. It is generally well-known that the wet paper web 1 is easily dehydrated when heated. This is because the viscosity of the water in the wet paper decreases with increasing temperature (1.03 × 1 at 20 ° C.).
0 ^-4 kgf sec / m ² → 0.569 × 10 ^-4 kgf at 50 ° C
sec / m ² ), because the resistance to dehydration filtration becomes small.
The (due to the large heat capacity of the roll) as a method of heating the wet paper, said a method of steam boxes, there is a method of heating the center roll itself, the latter slow heating response. On the other hand, the steel belt method of the present invention is a thin plate, has a small heat capacity, can easily control the rise and fall of the temperature, and can employ methods such as electromagnetic induction heating, steam heating, and gas heating. On the other hand, by arranging the steel belt, the sheet transfer can all be made a no-open draw by the transfer of the wet paper web 1 from the solid roll 11 after 2P to the steel belt 20 and the pickup roll 12 after 3P. Subsequently, with 3P, smoothness similar to that of single felt can be easily obtained. This is because the surface property (roughness) of the steel belt can be easily controlled by mechanical polishing.

FIG. 2 shows a second embodiment of the present invention. In FIG. 2, the wet paper 1 coming out of 1P is separated from the suction roll 5, enters 2P together with the felt 3, and is squeezed. 2P is a single felt section composed of a press center roll 11 'and a grooved roll 6c. 2P
The wet paper web 1 squeezed in the above is transferred from the center roll 11 ′ to the heating steel belt 20 looped so as to hold another center roll 7 and enters the next 3P. Other structures are the same as the embodiment of FIG. In addition to the steel belt, other materials can be used as long as they conform to the specifications of the steel belt.

[0010]

As described above in detail, according to the present invention, the heating means for the steel belt around which the center roll is wound, the temperature sensor and the control device are provided to control the heating of the steel belt. Since the center roll is not heated quickly, the structure of the center roll is simplified.
Further, according to the present invention, since all the wet paper webs are transported with no open draw, the trouble of running out of paper can be prevented. Further, in the present invention, the dryness after pressing can be improved by heating and dehydrating the wet paper. Now basis weight 6
4 g / m ² paper with 35% dryness and 100 kg linear pressure
/ Cm at a steel belt temperature of 20 ° C., the dryness after pressing was 40%. When pressed at a steel belt temperature of 80 ° C., the dryness after pressing was improved to 45%.

[Brief description of the drawings]

FIG. 1 is a flow chart of a wet paper web in a press machine of a paper machine according to a first embodiment of the present invention.

FIG. 2 is a flow chart of wet paper in a press machine of a paper machine according to a second embodiment of the present invention.

FIG. 3 is a wet paper flow diagram showing an example of a conventional press machine of a paper machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wet paper 2 Pickup roll 3 Pickup felt 4 Bottom felt 5 Suction roll 6a, 6b Groove roll 7 Center roll 11 Solid roll 12 Pickup roll 20 Steel belt 21 Heating device 22 Sensor head 23 Endless belt

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) D21F 3/00-3/08

Claims (5)

(57) [Claims] 1. A press machine for a paper machine for sequentially passing a wet paper web through a first to a third press section and dewatering, wherein a suction roll having a pickup felt and a first
A first pressed portion comprising a first grooved roll having a bottom felt, and a suction roll or a second grooved roll which is located downstream of the first pressed portion and constitutes the first pressed portion. and a double-dip press section consists of a solid roll, located downstream of the double-dip press section, a second Botomufe
Third groove Delors and steel belt with a belt
Center roll and and a third pressing portion constituted by a paper machine press apparatus in which the steel belt characterized in that the surrounding of the center roll having heating means comprising a. 2. A temperature sensor is provided on the downstream side of the heating means in the steel belt .
2. The press machine for a paper machine according to claim 1, further comprising a control device for controlling the temperature of the paper to a predetermined temperature. 3. The method of claim 1, wherein the most press section in the double-dip press section
The suction roll and the nip make up the steel
2. The press machine for a paper machine according to claim 1, wherein said solid roll which rotates in contact with a belt is provided. 4. In the third press section, the wet paper is fed to the steam press.
Between the belt and the second bottom felt
Paper machine press apparatus according to claim 1, characterized by being configured to press at the third groove Dror said center roll. 5. A pick-up roll for winding a felt downstream of the third press section and contacting and rotating with the center roll as a wet paper web transfer means from the press device to the downstream. The press machine of the paper machine according to the above.