CN111058327A

CN111058327A - Method for improving roller coating

Info

Publication number: CN111058327A
Application number: CN201911075555.1A
Authority: CN
Inventors: 韩光辉; 李子文
Original assignee: Fujian Qingshan Paper Industry Co ltd
Current assignee: Fujian Qingshan Paper Industry Co ltd
Priority date: 2019-11-06
Filing date: 2019-11-06
Publication date: 2020-04-24

Abstract

The invention discloses an improved method for a roller cladding layer, which comprises the following steps: the roll body, the roll surface, the material of the roll surface, the high improvement of the roll and the need of carrying out calibration dynamic balance on the roll after the roll encapsulation are finished. The novel coating layer is adopted, so that the novel rubber is not easy to degum, long in service life and capable of saving rubber coating cost, and compared with the traditional rubber, the novel rubber is higher in performance-price ratio; the invention can directly connect paper and make paper without idle running for too long time when using new roller, thus saving idle running time and improving economic benefit.

Description

Method for improving roller coating

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of roller coating, in particular to an improvement method of a roller coating layer.

[ background of the invention ]

The press section of the existing paper machine is a four roll, three nip compound press in which the face of the middle roll phi 1168 x 4724 rolls directly contacts the paper sheet as shown in figure 1. The normal line pressure is 70KN/m for the first pressure, 90KN/m for the second pressure and 140KN/m for the third pressure.

The technical requirements for the encapsulation of the roller surface are very strict because the roller surface of the intermediate roller directly contacts the paper sheet and the line pressure is large (140 KN/m). The press section of the paper machine was imported from Beloit, italy, in 1984, as were the intermediate rolls, and therefore, the intermediate roll encapsulation has been continued with Beloit type I glue, and although long-term use has met production requirements, it has several disadvantages: 1. the coating is easy to be degummed, the end surface degumming and the middle bulge are frequently generated and need to be encapsulated again, and the production is influenced because the encapsulation period is long and the standby roller cannot be in a standby state in time. 2. The paper sheet and the rubber surface are not easy to peel. When a new rubber-faced roller is used, in order to prevent the paper from being difficult to strip and string the scraper, the paper needs to be idle for several hours after the new roller is arranged on a machine and then is in running-in with the scraper blade, so that the paper is ensured not to string the scraper due to the stripping problem, and the normal paper leading is realized.

[ summary of the invention ]

The invention provides an improved method for a roller cladding layer, which aims to solve the following 2 technical problems: 1. the coating layer is easy to degum, the end surface degum and the middle bulge often occur and need to be encapsulated again, and the production is affected because the encapsulation period is long and the standby roller cannot be in a standby state in time; 2. the paper sheet and the rubber surface are not easy to peel. When a new rubber-faced roller is used, in order to prevent the paper from being difficult to strip and string the scraper, the paper needs to be idle for several hours after the new roller is arranged on a machine and then is in running-in with the scraper blade, so that the paper is ensured not to string the scraper due to the stripping problem, and the normal paper leading is realized.

In order to solve the technical problems, the invention adopts the following technical scheme:

an improved method of roll cladding comprising: the roll body, the roll surface, the material of the roll surface, the high improvement of the roll and the need of carrying out calibration dynamic balance on the roll after the roll encapsulation are finished.

Further, the length x diameter of the roller body is phi 1163mm x 4724 mm.

Furthermore, the roller surface is kept flat and smooth, has no defects and abrasion, and the thickness of the rubber coating layer is 25 mm.

Further, the surface material of the roller is a synthetic rubber material which contains 5% of stripping particles and 5% of wear-resistant particles and has the hardness of 18-22P & J.

Further, the height of the roller is 0.57 mm.

Further, the grooved roll of the roll is chamfered at both ends.

Further, the grooved roll has a model of phi 889 × 4724.

Further, the roller needs to be calibrated and balanced under the conditions of the rotating speed of 670-.

Further, the dynamic balance grade is G2.5 grade.

The invention has the following effects:

aiming at the problems of the rubber surface of the middle roller, the invention coats the second generation of high-quality rubber PeelpressII through research and development, and simultaneously chamfers the two ends of the corresponding grooved roller (phi 889 multiplied by 4724) of the compound pressing. Compared with the existing glue, the novel glue has better chemical corrosion resistance, temperature resistance and tear resistance, so that the linear pressure resistance is high under the same condition. The use of the new glue has several advantages: 1. the coating layer is not easy to degum, the service life is long, the cost of rubber coating is saved, and compared with the existing rubber, the novel rubber has high cost performance. 2. The paper sheet and the rubber surface have good stripping performance, and the new roller does not need to idle for too long time and is capable of directly receiving paper and making paper, so that the idle time is saved, and the economic benefit is improved.

[ description of the drawings ]

FIG. 1 is a schematic structural view of a roll cover prior to improvement in the roll cover technology;

FIG. 2 is a schematic diagram of a roll cover with improved technology.

[ detailed description ] embodiments

The present invention will be described in detail with reference to fig. 1 and 2.

Although the prior art of fig. 1 can meet the production requirements after long-term use, the prior art has several disadvantages: 1. the coating layer is easy to degum, the end surface degum and the middle bulge often occur and need to be encapsulated again, and the production is affected because the encapsulation period is long and the standby roller cannot be in a standby state in time; 2. the paper sheet and the rubber surface are not easy to peel, and when a new rubber surface roller is used, in order to prevent the paper sheet from being difficult to peel and stringing the scraper, the paper sheet is idle for several hours after the new roller is arranged on a machine and is in running-in with the scraper blade, so that the paper sheet is ensured not to bunch the scraper due to the peeling problem, and the normal paper leading is realized.

For this reason, the present invention is technically improved, as shown in fig. 2.

The width of the paper web is 4.2 meters according to the actual production requirements, so the length x diameter of the roll body is phi 1163mm x 4724 mm.

The middle roller needs to be in contact with the two-pressure vacuum roller, the three-pressure groove roller and the paper web, so that the abrasion and the roughness of the surface easily cause paper folding to influence the production, and a series of adverse effects of abrasion and falling of the rubber surface of the two-pressure vacuum roller to cause a squeezing part are easily caused when the middle roller is in high-speed contact with the two-pressure vacuum roller. Meanwhile, in order to guarantee the service life of the grooved roller, the grooved roller is replaced once according to the aging period of the II-type glue of 10 years and the service period of the roller of 8 months, the thickness of the grinding roller of the lower grinding roller is 1mm every time, and the thickness of the surface glue surface is calculated to be lower than 12mm and the grooved roller cannot be normally used. Therefore, the roller surface is kept flat and smooth, has no defects and abrasion, and the thickness of the rubber coating layer is 25 mm.

Because of the middle roll is in the normal during operation of press portion, cause the roll surface to appear broke and partial debris easily under the condition of paper folding, consequently need adopt the carbon fiber scraper to clear away on the roll surface, the roll surface is under the condition that hardness is less than the scraper, the roll body is worn and torn easily to the scraper friction roll surface, causes the roll surface pit to appear, forms harmful effects such as paper folding, and the face of gluing needs to improve its hardness and wearability to make the scraper can carry out better clearance to debris such as broke. Therefore, the surface material of the roller is a synthetic rubber material which contains 5% of stripping particles and 5% of wear-resistant particles and has the hardness of 18-22P & J.

Because the squeezing part is of a four-roller three-pressing structure, the roller is subjected to laminating paper operation and pressure relief and roller lifting shutdown by adopting air control, the four rollers all need one middle high to carry out data acquisition to form a control module, and the middle high of the first pressing grooved roller and the third pressing grooved roller is 0.8mm, and the middle high of the second pressing vacuum roller is 1.1mm, so the middle high of the roller is 0.57 mm.

Because the rotating speed of the middle roller is basically 670-700m/min, the middle roller belongs to a high-speed rotor, the transverse vibration of the roller is easily caused in the high-speed operation, so that the rotor cannot normally operate, the frame of the squeezing part is easily caused to form resonance, and the damage of each device of the squeezing part is increased, therefore, the roller needs to be subjected to G2.5-level dynamic balance.

Aiming at the problems of the rubber surface of the middle roller, the invention coats second generation high quality rubber Peelpress II (novel rubber) through research and development, the Peelpress type rubber is a synthetic rubber material with the hardness of 18-22P & J, the rubber material contains 5 percent of stripping particles and 5 percent of wear-resistant particles, and the stripping particles and the wear-resistant particles are novel materials synthesized by carbon fibers, ceramic particles and nano materials; the structure of the wear-resistant steel plate is more regular, and the molecules form a compact net structure, so that the wear resistance and the corrosion resistance are better. Therefore, compared with the surface of rubber of the same type (the existing rubber), the rubber has better stripping property and scraping property (the position suitable for arranging a scraper blade), and has very critical effect on the use of the center roller; the wear resistant particles provide wear resistance, especially with a doctor blade. Also note that: the hardness of the scraper is matched with the hardness of the rubber surface.

At the same time, both ends of the grooved roll (phi 889 multiplied by 4724) corresponding to the compound press are chamfered. Compared with the existing glue, the novel glue has better chemical corrosion resistance, temperature resistance and tear resistance, so that the linear pressure resistance is high under the same condition. The use of the new glue has several advantages: 1. the coating layer is not easy to degum, the service life is long, the cost of rubber coating is saved, and compared with the existing rubber, the novel rubber has high cost performance. 2. The paper sheet and the rubber surface have good stripping performance, and the new roller does not need to idle for too long time and is capable of directly receiving paper and making paper, so that the idle time is saved, and the economic benefit is improved.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. To those skilled in the art to which the invention relates, numerous changes, substitutions and alterations can be made without departing from the spirit of the invention, and these changes are deemed to be within the scope of the invention as defined by the appended claims.

Claims

1. A method of improving a roll cover, comprising: the roll body, the roll surface, the material of the roll surface, the high improvement of the roll and the need of carrying out calibration dynamic balance on the roll after the roll encapsulation are finished.

2. The improved method of roll coating of claim 1, wherein: the length and the diameter of the roller body are phi 1163mm and phi 4724 mm.

3. The improved method of roll coating of claim 1, wherein: the roller surface is kept flat and smooth, has no defects or abrasion, and the thickness of the encapsulation layer is 25 mm.

4. The improved method of roll coating of claim 1, wherein: the surface material of the roller is a synthetic rubber material which contains 5 percent of stripping particles and 5 percent of wear-resistant particles and has the hardness of 18-22P & J.

5. The improved method of roll coating of claim 1, wherein: the height of the roller is 0.57 mm.

6. The improved method of roll coating of claim 5, wherein: the grooved roll of the roll is chamfered at both ends.

7. The improved method of roll coating of claim 6, wherein: the grooved roll has a model of phi 889 x 4724.

8. The improved method of roll coating of claim 1, wherein: the roller needs to be calibrated and balanced under the conditions of the rotating speed of 670-.

9. The improved method of roll coating of claim 8, wherein: the dynamic balance grade is G2.5 grade.