leizhan Paper Machine

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The Relationship Between Beating and Paper

1. When the paper ash is too low, can improve the beating degree to close the paper to improve the retention rate.

2. Paper sheet floating in the cylinder is due to the adhesion of the paper and the cylinder is not enough, can improve the beating degree to solve this problem.

3. Paper stickers large dryer mean that paper structure is too tight, which may be caused by excessive beating:- can be improved by reducing the beating degree.

4. Toppling too low will cause the paper to float in the cylinder surface:- such as other strength test allows, may be appropriate to reduce the beating degree.

5. Broken paper spots are mainly broken paper in the pulper is not a good broken solution:- to enhance the effect of high-frequency deflation machine;- may need to strengthen a certain degree of beating;- If the beater is used as an air conditioner, it can not achieve the desired effect.

6. If the loose thickness is too low, reduce the beating degree, so that the paper structure is more open.

7. Rupture resistance or Mullen usually changes directly through beating:- Adjust the beating level to the necessary level.

8. Pressure black and spots when the press is due to poor shape caused.

9. Thickness and beating degree in reverse relationship:- if other test results allow, adjust the beating;- The initial beating caused a significant decrease in thickness.

10. Creme and drying reflect to the distribution of web quality:- It is helpful to reduce the beating and improve the forming.drying to reflect the distribution of web quality:- It is helpful to reduce the beating and improve the forming.

11. When too much water into the groove under the roll will cause groove collapse:- reduce the beating, improve the degree of slurry freeness;- Raising the slurry temperature is usually helpful.

12. Increasing the amount of short fibers or lowering the beating degree will help solve the curl problem.

13. Pore (air permeability) with the beating and rapid changes:- Increase the beating degree and beating concentration to increase the ventilation resistance.

14. The main reason for raising the hair is the degree of sizing is not enough or fake sizing, and the slurry through the General Assembly to increase the problem.

15. The reason for the poor surface condition of the single-sided paper is due to poor formation or poor adhesion of the sheet on the large dryer; - Raising the beating degree helps to shape and attach the paper to the large dryer.

16. The main reason for poor formation is the network is not good dehydration and pulp in the long fiber content too much:- to improve the beating degree will be helpful, but must reduce the amount of long fiber.

17. The reason for the hair loss is that the fiber combination is not good and / or the amount of short fiber is too large:- Improve the beating degree can improve the combination, but to reduce the beater cutting behavior and make the pulp freeness has improved.

18. Wood grain edge is due to uneven distribution of fiber in the network case:- Reduced beating degree is helpful for non-uniform shrinkage of low edge.

19. sticky pulp easily lead to sticky network:- Reduced beating degree can be improved.

20. Beating is not only related to the internal bonding, but also improve the shape.

21. Press the paper is mainly off the paper is too large or too much sticky sticky pulp:- Adjust the beating to get the desired state.

22. Short fiber or sticky pulp will aggravate the roll of the vacuum roll or vacuum press roll:- Check the beating to see if it is necessary to reduce the beating degree.twenty three. Any degree of beating has a negative effect on the softness of tissue:- no beating or as low as possible.

23. Stiffness and beating degree and the composition of the slurry:- beating can improve the stretch stiffness, but must pay attention to not make the paper thickness loss too much;- brittle and short fiber content, it should try to avoid the pulp in the pulp when the cut off.

24. Any degree of beating has a negative effect on the softness of tissue:- no beating or as low as possible.

25. In general, the elongation increases with increasing beating degree and beating concentration.

26. Beating has a negative impact on the tear, and long fiber with a positive impact on the tear:- may need to reduce the beating degree, but more important is to avoid cutting off.

27. Tensile strength changes with the beating, fine fibrosis and high beating concentration is conducive to tensile strength.

28. Beating also affects the absorption rate and absorption capacity:- Closed sheet structure can improve the absorption rate, but will reduce the absorption capacity.

29. Good shape and closure of the paper structure can reduce the watermark:- Raising high beating can improve indentation.

30. low freeness pulp into the paper mark will be more obvious:- adjust the beating degree if necessary;- also check the location of the watermark roller.

31. The fiber bundles in the sheets are often derived from the undiscovered fiber bundles of the conical beater:- Check the condition of the conical beater.If you have any questions or need, feel free to contact us.

Email: [email protected]

Web: www.leizhanworld.com 

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2017 China International Paper Technology Exhibition

In order to promote the development of China's paper industry, to better display the achievements of science and technology development of the paper industry, papermaking enterprises and related industries to build communication and communication platform, the Organizing Committee site visits and comprehensive consideration of industry development characteristics and geographical distribution Factors, in 2017, by the China Paper Association, China Paper Society and China Pulp and Paper Research Institute co-sponsored the "2017 China International Paper Technology Exhibition and Conference" will move to Shenzhen. The exhibition will be held at the Shenzhen Convention and Exhibition Center from September 13 to 15, 2017. Previous exhibitions have attracted more than 200 countries and regions from more than 200 papermaking equipment manufacturing, paper chemicals and paper-related well-known exhibitors, Videe, Voith, Andritz, China Paper Equipment, ABB, Siemens , Finland Pavilion and other industry giants are all unveiled at the exhibition. The international papermaking technology report held in the same period is rich in content and conforms to the development trend of the times, which has been well received by exhibitors and listeners. Papermaking Technology Exhibition has developed into a brand-name exhibition of paper machinery and equipment. During the International Paper Science and Technology Exhibition, the "2017 China International Papermaking Innovation and Development Forum" and "2017 CIPTE International Papermaking Technology Report" will be held, as well as some related technical exchanges and seminars, enrich the contents of the exhibition and create industry technical event. Through the exhibition series of distinctive activities, not only can improve the professionalism of the audience, increase the number of effective professional visitors, but also during the exhibition, to maximize the domestic paper companies and exhibitors to exchange and cooperation, better Return customers. At the same time, for papermaking enterprises and their upstream equipment, raw materials, chemicals, automatic control and other suppliers to build a communication and communication platform to promote the development of China's paper industry.

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150T/D Corrugated Paper Making Line

Leizhan supply the whole paper pulp machine for Yunnan Minhai Paper Mill 150t/d corrugated paper making line, this new paper making line use waste paper as raw material, the pulping process is more complex than wood pulp making line, to meet the paper making requirement need to install pulper machine, cleaner, screening equipment, etc.

Information of cooperation

Time: 2017,4,27

Finished paper: corrugated paper

Capacity: 150t/d

Equipment: Drum pulper, Chain conveyor, High density cleaner, etc.

Pulping process

Pulper equipment: Drum pulper 3000mm, h=12/11/10mm, C=14~18%

Cleaner: High density cleaner C=3~5% P=0.2~0.5%, Low density cleaner: C=0.8~1.2%

Screening equipment: Coarse pressure screen C=3~4%, fine screen C=1% S=0.2mm

Fiber separator: C=2.5%

Reject separator: C=1~2%

Corrugated paper machine

Paper grade: high-strength corrugated paper

Trimmed width: 1575-5800mm

Basis weight: 60-150g/㎡

Operating speed: 100-800m/min

Production capacity: 15-500t/d

We not only supply paper pulp machine, but also paper machine, we have advanced technology and rich experience, can supply for you high quality low price paper machine, if you have any need, welcome to consult us for maore details.

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Effect Of Recycled White Water Quality On Papermaking

How many can you say about the effect of recycling white water quality on paper making?

The effect of recycling white water quality on paper making

1. For making high-grade paper, the pulp, which is pulp workshop sent to the paper workshop, produce white water, because of the residual chlorine of the white water is high, it affects the paper machine color matching, sizing and so on, generally the white water will directly reuse to the paper workshop, and the water can be recycled to the pulp workshop for reusing.

2. Reuse white water usually contains small fibers, fillers, sizing material and other additives, when the suspended solids is high, will increase the ash content of finished paper, thus affect the paper strength.

3. After repeated recycling of reuse white water, microorganisms in the water multiply in large quantities, easy to cause pulp system appears rotted pulp mass, in the pulp chest and pipe wall will easy to form fog, microorganisms fall off and mix into the pulp, resulting in paper holes and paper machine broken.

4. Due to the use of fillers and other saline materials, calcium and magnesium in the white water increase, water hardness rise, hard water is adverse for paper sizing. For acidic sizing, because Ca2+, Mg2+ in the water will act with saponified sizing material, and form insoluble calcium soap and magnesium soap, thus result in the loss of rosin size.

5. In the white water with AKD sizing, due to the fiber content is higher than the filler surface, sizing material tends to adsorb on the filler surface, the AKD, which is adsorbed on the filler surface, doesn't have a positive effect on the sizing. If the filler is not retained, then the sizing material also will flow into the white water, if this white water reuse again, some of the original sizing material, which is adsorbed by the filler, will redistribute in the fiber surface, after drying to produce sizing chest effect.

6. White water reuse also have a great effect on paper dyeing. On the one hand, due to the white water contains a part of the toner, it is benefit for paper color mixing, and the stability of white water reuse plays an important role in the paper stabilizing. On the other hand, because of the increase of white water hardness, will reduce the dyeing ability of dye.

7. In the process of papermaking, there are wood residue, resin acid, sizing agent, retention aid and other surfactants in the pulp, large number of foam produced in the white water, the gas in the reuse white water will cause the paper machine fluctuation, at the same time is not conducive to the wire part dewatering, the paper appears "needle eye" and eventually affects product quality.

8. Papermaking white water reuse is conducive to the stability of approach flow stock PH.

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M.C.Pressure Screen

Pressure screen plays a very important role in the pulping process,the M.C.Pressure Screen can be used as a coarse screening and fine screening equipment. Pressure screen

Pressure screen is Leizhan hot products, our company introduced advanced technology at home and abroad,Here are some of the competitive advantages of our company's pressure screen. Competitive Advantages The cylinder of pressure screen is made of stainless steel plate by submerged arc welding and argon arc welding, etc., and the weld is artificial welding The contact with the pulp is stainless steel, the rotor has 4 to 5 kinds, adjustment according to the concentration. Automatic main water device using Finnish technology, bearing from Japan NSK, the sensor using German technology, automatic oil injection device imported from Korea The inside of the cylinder is double-sided and mechanical seal The base is folded by a whole piece of steel, solid and stable Leizhan as a professional paper machinery manufactures, high quality and low price paper machine is our consistent pursuit. You can select paper machine of high quality from a reliable factory at very reasonable prices.

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Drum Pulper Paper Machine

Waste paper furnishes are defiberized by means of continuous turnover (by falling inside the rotating drum). This action separates fibers gently from contaminants, with minimal fiber loss. The contaminants are rejected continuously and automatically. The drum has two sections (pulping and screening): Wetting, chemical impregnation, and defiberizing take place in the pulping section, while fiber recovery and reject separation are assigned to the screening section.

Benefits of the Leizhan Drum pulper

1. Most-accepted quality, improved ink detachment, and brightness gain (thanks to gentle pulping and efficient removal of coarse contaminant with minimum fiber loss) 2. Highest availability due to single-drum machine design with no internals that can create wire build-ups 3. Reliable and proven mechanical components 4. Minimum maintenance and efficient single drive 5. Suitable for poor quality waste paper, even with high contaminant load

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Paper Making Process

Making pulp

1 Several processes are commonly used to convert logs to wood pulp. In the mechanical process, logs are first tumbled in drums to remove the bark. The logs are then sent to grinders, which break the wood down into pulp by pressing it between huge revolving slabs. The pulp is filtered to remove foreign objects. In the chemical process, wood chips from de-barked logs are cooked in a chemical solution. This is done in huge vats called digesters. The chips are fed into the digester, and then boiled at high pressure in a solution of  Paper sodium hydroxide and sodium sulfide. The chips dissolve into pulp in the solution. Next the pulp is sent through filters. Bleach may be added at this stage, or colorings. The pulp is sent to the paper plant.

Beating

2 The pulp is next put through a pounding and squeezing process called, appropriately enough, beating. Inside a large tub, the pulp is subjected to the effect of machine beaters. At this point, various filler materials can be added such as chalks, clays, or chemicals such as titanium oxide. These additives will influence the opacity and other qualities of the final product. Sizings are also added at this point. Sizing affects the way the paper will react with various inks. Without any sizing at all, a paper will be too absorbent for most uses except as a desk blotter. A sizing such as starch makes the paper resistant to water-based ink (inks actually sit on top of a sheet of paper, rather than sinking in). A variety of sizings, generally rosins and gums, is available depending on the eventual use of the paper. Paper that will receive a printed design, such as gift wrapping, requires a particular formula of sizing that will make the paper accept the printing properly.

Pulp to paper

3 In order to finally turn the pulp into paper, the pulp is fed or pumped into giant, automated machines. One common type is called the Fourdrinier machine, which was invented in England in 1807. Pulp is fed into the Fourdrinier machine on a moving belt of fine mesh screening. The pulp is squeezed through a series of rollers, while suction devices below the belt drain off water. If the paper is to receive a water-mark, a device called a dandy moves across the sheet of pulp and presses a design into it.

The paper then moves onto the press section of the machine, where it is pressed between rollers of wool felt. The paper then passes over a series of steam-heated cylinders to remove the remaining water. A large machine may have from 40 to 70 drying cylinders.

Finishing

4 Finally, the dried paper is wound onto large reels, where it will be further processed depending on its ultimate use. Paper is smoothed and compacted further by passing through metal rollers called calendars. A particular finish, whether soft and dull or hard and shiny, can be imparted by the calendars.

The paper may be further finished by passing through a vat of sizing material. It may also receive a coating, which is either brushed on or rolled on. Coating adds chemicals or pigments to the paper's surface, supplementing the sizings and fillers from earlier in the process. Fine clay is often used as a coating. The paper may next be supercalendered, that is, run through extremely smooth calendar rollers, for a final time. Then the paper is cut to the desired size.

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Pulp Varieties

Pulp Varieties

Mechanical Pulp

Stone Groundwood pulp: mechanically grinds the wood into relatively short fibres.  End-use: the resulting pulp is used mainly in newsprint and wood-containing papers, such as lightweight coated (LWC) and super-calendered papers.

Thermo-mechanical pulp (TMP): the wood particles are softened by steam before entering a pressurised refiner.

          End-use: TMP has mainly the same end-uses as Stone Groundwood                   pulp.

Variants of the above two processes are also possible.

Semi-chemical pulp

Semi-chemical pulp: produced in a similar way to TMP, but the wood particles are chemically treated before entering the refiner.

          End-use: this pulp has properties suited to tissue manufacture. Some chemi-thermo mechanical pulp is used in printing and writing grades.

Chemical pulp

Sulphite pulp: produced by cooking pre-cut wood chips in a pressure vessel in the presence of bisulphite liquor. The pulp may be either bleached or unbleached.

          End-use: ranges from newsprint, printing and writing papers, to tissue and sanitary papers.

Sulphate/Kraft pulp: pulp produced by cooking wood chips in pressure vessels in the presence of sodium hydroxide (soda) liquor. The pulp may be unbleached or bleached.

          End-use: widespread uses - pulp used for graphic papers, tissue and carton board, wrappings, sack and bag papers, envelopes and other speciality papers.

Deinked pulp

Pulp made from recovered paper from which inks and other contaminants have been removed.

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HOW PAPER IS MADE

Paper is simple material. It is essentially a mat held together by the fiber’s roughness, and can be made from almost any fibrous material like wood or recycled paper.

The process for making paper was invented in China in the second century A.D., and all paper was made one sheet at a time until 1798. To learn more about the history of paper, clickhere.

The process of making paper has not changed – at least, fundamentally – since its discovery. But with almost two centuries of improvements and refinements, modern papermaking is a fascinating, high tech industry.  Wisconsin has led the nation in papermaking for more than 50 years.

STEP 1: FORESTRY

Typically, trees used for papermaking are specifically grown and harvested like a crop for that purpose. To meet tomorrow's demand, forest products companies and private landowners in Wisconsin plant millions of new seedlings every year.

STEP 2: DEBARKING, CHIPPING AND/OR RECYCLING

To begin the process, logs are passed through a debarker, where the bark is removed, and through chippers, where spinning blades cut the wood into 1" pieces. Those wood chips are then pressure-cooked with a mixture of water and chemicals in a digester.

Used paper is another important source of paper fiber. Thanks to curbside recycling programs in many communities, we recover 40% of all paper used in America for recycling and reuse. The paper is shredded and mixed with water.

STEP 3: PULP PREPARATION

The pulp is washed, refined, cleaned, screened and sometimes bleached, then turned to slush in the beater. Color dyes, coatings and other additives are mixed in, and the pulp slush is pumped onto a moving wire screen.

Computerized sensors and state-of-the-art control equipment monitor each stage of the process.

STEP 4: PAPER FORMATION

As the pulp travels down the screen, water is drained away and recycled. The resulting crude paper sheet, or web, is squeezed between large rollers to remove most of the remaining water and ensure smoothness and uniform thickness. The semidry web is then run through heated dryer rollers to remove the remaining water.

Waste water is carefully cleaned and purified before its release or reuse. Fiber particles and chemicals are filtered out and burned to provide additional power for the mill.

Papermakers carefully test for such things as uniformity of color and surface, water resistance, and ink holding ability.

STEP 5: PAPER FINISHING

The finished paper is then wound into large rolls, which can be 30 feet wide and weigh close to 25 tons. A slitter cuts the paper into smaller, more manageable rolls, and the paper is ready for use.

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Paper Making Process

Pulpwood normally arrives at the paper mill in the form of very thick sheets and recovered paper normally arrives in the form of large, compressed bales. Both these materials have to be broken down so that the individual fibres they contain are completely separated from each other. This process is performed in large vessels, known as ‘pulpers', where the raw materials are diluted with up to 100 times their weight of water and then subjected to violent mechanical action using steel rotor blades.

 The resulting slurry (known as papermaking pulp) is then passed to holding tanks. During this preliminary stage, auxiliary chemicals and additives may be added. The auxiliary chemicals are usually combined with the fibrous raw materials at levels from below 1% to 2% and can be sizing agents, which reduce ink and water penetration, and process anti-foaming agents. Common additives consist of clay, chalk or titanium dioxide that are added to modify the optical properties of the paper and board or as a fibre substitute. The stock is then pumped through various types of mechanical cleaning equipment to the paper machine.

 In the pulp and papermaking industry 95% of the water used is cleaned and reused on-site and all waste water is treated in accordance with European legislation and standards. Paper mills have state of the art wastewater treatment installations to the extent that in some cases water in lakes close to paper mills is now cleaner than it was in the past. Since 1994, the paper industry has reduced annual water consumption by over 14% per year.

 On the paper machine, more water is added to produce a fibre suspension of as little as 1-to-10 parts fibre to 1000 parts water and the resulting mixture is passed into a headbox which squirts it through a thin, horizontal slit across the full machine width (typically 2 - 6 m) on to a moving, endless wire mesh.

The water is then removed on this wire section by a mixture of gravity and suction in a process known as sheet formation where the fibres start to spread and consolidate into a thin mat, which is almost recognisable as a layer of paper on top of the wire mesh.

 This web of wet paper is then lifted from the wire mesh and squeezed between a series of presses where its water content is lowered to about 50%. It then passes around a series of cast-iron cylinders, heated to temperatures in excess of 100ºC, where drying takes place. Here the water content is lowered to between 5% and 8%, its final level. Throughout its passage from the wire mesh to the drying operation, the paper web is supported by various types of endless fabric belts moving at the same speed. After drying, some papers may also undergo surface treatments e.g. sizing and calendaring - a process consists of smoothing the surface of the paper by passing it between a series of rotating, polished, metal rollers to produce a glazed or glossy appearance. The paper is then wound into a reel.

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Paper Pulping Process

Paper is made from the cellulose fibres that are present in hardwood and softwood trees . Whether using wood or recovered paper, the first step is to dissolve the material into pulp, and this need pulper equipment. Regardless of the type of pulping process used, the wood or recovered paper is broken down into its component elements so that the fibres can be separated. The pulping results in a mass of individual fibres being produced. The fibres are then washed and screened to remove any remaining fibre bundles. The water is then pressed out and the residue is dried.

The pulp is then ready to be used directly or it can be bleached and made into white paper. In an 'integrated paper mill' the pulp will be fed directly to a paper machine. Alternatively, it will be dried and pressed into bales ready for use as a raw material in paper mills worldwide.

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Paper Making Machine

The paper making machine is a complete set of equipment for making the pulp to form the webs, including the headbox, the net, the press, the drying, the calender, the reel, and the main parts of the drive and the steam, water, vacuum , lubrication, heat recovery and other auxiliary systems. The wet paper web is the core of the paper machine, so the paper machine can be divided into fourdrinier paper making machine, folder paper machine and rotary paper machine according to the structure of the network. Email: [email protected] Web: www.leizhanworld.com

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Packaging Paper making project in Egypt

150T/D Packaging Paper making project in Egypt. How much do you know about Pulping process? Leizhan supply the pulping equipment in Egypt, If you have the same requirement, feel free to contact us~ Email: [email protected] Web:  http://www.leizhanworld.com/kraft-paper-making-project-case/150td-packaging-paper-making-project/

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Kraft paper making machinery

Kraft paper is used in our life widely, many paper making friends are interested in kraft paper making line. The following our engineers give the solution for kraft paper making line. Pulping process Raw material: waste paper Production Capacity: 80T/D Main equipment: chain conveyor, D type hydrapulper, high density cleaner, M.C.pressur screen, reject separator, fiber separator, mid density cleaner, low density cleaner, double dis refiner, inflow pressure screen, square pulp chest agitator. All this can be available in Leizhan, weicome to consult us. Email: [email protected] Web: http://www.leizhanworld.com/kraft-…/kraft-paper-making-line/