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Paper machine operating process and safety regulations:

1. Pulping worker: Always check the water level of the headbox and whether the pulp discharge port of the pulping box is blocked (or whether the concentration tester is operating normally) and timely control the gram weight of the paper to ensure that the quantification meets the production standards and product quality.

2. Lead the whole class of workers to produce safely, and must not violate the operating procedures to ensure safe production.

3. Responsible for the handling of technical problems of the whole machine and the handling of equipment paper defects. Those who cannot handle major problems should report to the factory office for instructions in time.

4. Blanket workers: You should always check the operation of each roller of the blanket, and check whether the blanket is rotten and scratched. If any problem is found, deal with it in time to keep the blanket in normal operation. Paper defects such as crushing and wrinkling.

5. The blanket should not be discounted, too tight or too loose. Keep the blanket tight and moderate. When the blanket deviates, use the blanket adjuster (automatic screen guide) to adjust the blanket roller when it is involved in the sundries and pulp blocks. dig out to prevent getting involved in the blanket and causing personal accidents.

6. Gas watcher: Master the air pressure and humidity curve of each cylinder group according to the process regulations. If the air pressure of the drying cylinder of the paper machine changes, if the air meter fails, the air should be stopped in time to replace the safety valve of the air pressure meter. Once the safety valve is set, it is not allowed to adjust and overpressure. production to ensure the safe use of the dryer.

7. A steam-water separator must be installed at the drain outlet of the drying cylinder to automatically discharge the condensed water in the cylinder.

8. The surface of the drying cylinder should be kept clean, the surface of the cylinder should not be stuck with impurities, and the drying cylinder and the scraper should be kept in good agreement. If the vehicle is parked for more than 2 hours, the air should be slowly boosted after driving to prevent the drying cylinder from expanding and cracking during the heating process. .

9. During the normal production of the paper machine, it is necessary to check the operation of the machine frequently. If the bearing or roller is found to be hot or vibrated, it should be dealt with in time.

10. The main production parts in the paper machine: drying cylinder, idler, couch roll, press roll, and key parts of the wire section, care should be taken to protect them during operation, and their surface flatness and appearance should not be damaged. The quality life of the above parts is damaged due to improper operation The whole machine will be produced.

The development history of paper machine. What are the four major inventions in China? This question can be answered by elementary school students, but the editor still feels that papermaking is still a very important invention. So far, in some remote places, ancient papermaking is still circulated. And it has been sought after by some enthusiasts who are interested in paper machines.

In 105 AD, Cai Lun summarized the use of hemp fiber in papermaking since the Western Han Dynasty, using bark, hemp, rags, old fishing nets and other raw materials to improve the papermaking process, marking the beginning of the paper machine.

Around the eighteenth century, papermaking technology has been further developed in Europe. It has been further improved and developed from the Netherlands, France, and the United Kingdom, and developed into the familiar paper machine concept, Fourdrinier paper machine and cylinder paper machine.

Since the 1950s, papermaking machinery has seen more development and innovation. For example, vertical continuous digesters, displacement scrubbers, hot rolling mills, new pressure screens, slag removers, etc. have appeared in pulping equipment. In paper machines, new types of pulp boxes, nets, laminating machines, polyester forming nets, etc. appear. There are many kinds of technologies.

After the 1960s, the controllable DC motor speed control system began to be widely used in paper machines. Electronic technology was used to detect, control and record the parameters of the papermaking process, such as the speed, concentration, temperature and flow rate of the machine. Thickness etc. By the 1980s, large vertical continuous digesters could produce more than 1,000 tons of pulp per day. The width of the paper is up to 10 meters, the speed is above 1000 meters per minute, and the daily output exceeds 500 tons.

The above is a history of the development of paper machine, I hope you have some understanding.

Development situation and development trend of headbox

The earliest used headbox was the open ram headbox, which was produced before the Fourdrinier brothers invented the Fourdrinier paper machine in 1804. Its structure and form are relatively simple, the technical requirements are not high, it can only be applied to low-speed paper machines, and the homogenization effect is poor.

As the speed of the paper machine increases, the static head required for the formation of the paper stock in the weir must increase with the square relationship of the speed, so when the speed of the paper machine increases, the required static head must increase. At higher vehicle speeds, if an open headbox is used, it becomes large and complex in terms of volume, height, structure, and weight. Moreover, it is impossible to efficiently disperse, straighten and disperse fibers in such a large volume of paper stock in the weir pond to provide a high-quality web-jet paper stream. To solve this problem, closed (air cushion) headboxes were researched and developed in the late 1940s.

After the 1970s, the developed air-cushion headbox absorbed the advantages of some headbox designs, and adopted some new headbox technologies such as conical distribution headers, hydraulic distribution rectifiers, elimination of foam overflow, optimization of upper and lower headboxes. The lip structure, etc., has been greatly improved in performance, so it is also widely used in medium-speed Fourdrinier wire paper machines and sandwich wire paper machines.

Since the 1970s, in order to meet the needs of the development of new multi-layer forming technology, a multi-layer hydraulic headbox has been researched and developed. Multi-layer hydraulic headbox is a multi-channel full flow hydraulic headbox. At present, the multi-layer hydraulic headbox can be used not only for the production of cardboard, but also for the production of tissue paper and high-grade paper. It plays a good role in improving the quality of paper and rationally using fiber raw materials. Headbox has a very good development prospect. At present, multi-layer hydraulic headboxes with various structures have been researched and developed.

Since the 1990s, the research and development of the control and adjustment technology of the dilution water concentration in the headbox has been a major achievement and progress in the common technology of the headbox. The headbox adopts the dilution water concentration control and adjustment technology to adjust the bias flow and cross flow caused by the weir plate. Several systems have been developed, and most new headbox designs use this technology.

Toilet paper is our most commonly used daily necessities. Do you know the toilet paper machine? The toilet paper machine is a professional equipment for the production of toilet paper. According to the degree of automation, the toilet paper machine can be divided into: automatic toilet paper rewinder, semi-automatic toilet paper rewinder. According to different functions, the toilet paper machine can be divided into: toilet paper rewinder, toilet paper slitting machine. The editor of Shandong Yisitai briefly introduces the replacement sequence of the toilet paper machine felt.

Replacement sequence of toilet paper machine felt:

1. Set the press roll

2. Set the west side felt roller

3. Set the east side felt roller

4. Set the bottom pattern roller

5. Set of other felt rollers

Precautions for replacing the felt of the toilet paper machine

1. When replacing the wool cloth, the post must be responsible for all-round work and directing the crane. When directing the crane, it is necessary to concentrate, keep close contact, and control accurately.

2. Be sure to check whether the wool cloth specification meets the requirements before replacement. Follow the direction of rotation and the arrow to replace it. Reverse sleeves are not allowed.

3. The squeezing roller must use a wire rope of ∮12mm or more, and the sling roll must use a wire rope of ∮10mm or more.

4. Be sure to loosen the tension roller to the top before putting on the wool cloth.

5. When the set of felt rollers needs to be lifted by someone; it must be lifted by two or more people to prevent injury.

6. When covering the woolen cloth, it should be entered in a single layer, and it is not allowed to push it in a pile to avoid scratching the woolen cloth and the opposite direction of the cover.

7. Don't put your hands on the surface of the base when you set the press rolls, and pull in the wool cloth sideways to prevent the rolls from falling off and causing personal accidents.

8. After the wool cloth is covered, all parts must be checked and installed, the screws are fastened, and the wool cloth is smooth.

9. The new wool cloth should be properly tensioned and not too tight.

10. The scouring cloth must be washed.

11. After the work is completed, explain clearly to the shift, the shift is responsible for the inspection work and make all preparations for starting up.

Today, Shandong easttai editor takes everyone to understand the advantages and functions of the pulper rotor：

Advantage:

1. The new energy-saving rotor will strengthen the hydraulic function

2. With the new special-shaped sieve plate, it can improve the efficiency of fiber defibration and reduce energy cost.

Functions:

1. Transfer kinetic energy to the material in the tank.

2. Shred the bundles and pieces of paper directly.

3. Push the slurry in the axial direction to strengthen the mixing of the materials in the tank. In a pulper equipped with a sizing screen, the rotor can also play a role in cleaning the screen holes.

With the improvement of the degree of sealing of paper machine white water, dissolved substances and colloids (DCS) in the white water also accumulate, which will not only lead to the increase of anionic interference substances, but also cause a large number of bacteria to multiply, which seriously affects the chemical production of pulp bleaching. Use efficiency. In actual production, to reduce the PCD value in white water, the following methods can be used:

(1) Appropriate degree of closed circulation of white water. Reduce the pollution load of wastewater, add fungicides to limit the number of bacteria, and reduce anionic waste.

(2) Clean the entire system regularly. It can remove stubborn deposits, while appropriately increasing the temperature of the cleaning solution can speed up the reaction speed of the cleaning solution and improve the cleaning effect.

(3) Use squeezed filtrate membrane to treat filtrate wastewater. It can remove the suspended solids and anionic garbage in the wastewater, and reduce the COD in the wastewater, and the treated filtrate can be directly reused in the production line to replace the application of tap water.

(4) Use super-efficiency shallow air flotation technology to treat white water. The removal rate of suspended solids is high, which can effectively reduce the content of anionic interference substances in the white water, and can also remove some soluble COD and BOD.

(5) Strengthen the selection and optimization of paper machine wet end chemical additives. Ensuring the addition point and order of chemicals will help promote adsorption on the surface of fibers and fillers and good particle effects. It can increase the retention rate of fine fibers and fillers in a single pass, reduce the concentration of thick white water under the wire, and improve the papermaking system. The degree of white water closed circulation.

(6) Add chemicals such as anion collectors and flocculants to the wet part of the paper machine. The treatment effect of adding PAC and PAM or bentonite and PAM has great room for improvement. The PCD is greatly reduced, the turbidity of the effluent is greatly reduced, and the pH value is reduced.

As we all know, the sizing roll and Squeeze roll in the size tank are arranged in pairs, and half of the sizing roll is immersed in the slurry. When the sizing roller rotates, the sizing can be brought to above the liquid level, so that the yarn is always surrounded by sufficient sizing before squeezing, and the dipping time is prolonged. So what are the specific differences between the sizing roll and the Squeeze roll?

Sizing roll are generally seamless steel pipes with chrome-plated surfaces, which require a smooth, rounded and wear-resistant surface; while Squeeze rolls are generally cast iron rolls covered with nitrile rubber, with smooth surfaces and microporous surfaces. The three technical indicators of Squeeze roll are directly related to the sizing: 1. The surface state of the squeeze roll, that is, whether it is a smooth roll or a microporous roll; 2. The surface hardness of the Squeeze roll; 3. The effect of the Squeeze roll on the warp and the sizing roll Pressure, namely squeezing force. The above are some related introductions about the difference between the sizing roll and the Squeeze roll. I hope it will be helpful for your further understanding.