White water sieve

     The white water filter (white water screen) allows you to save money on power, water, fiber, chemicals, wastewater treatment, etc. In addition, it can also avoid the consequences caused by downtime and keep the nozzles from being clogged. Its effect is so significant. So you can recoup your costs very quickly - in fact as little as six months - and with the other financial advantages, that's attractive.

Technical support:

The engineers of Xinxiang Heying Machinery Equipment Co., Ltd. will help you analyze the waste paper raw materials and production process requirements, and then recommend suitable machine accessories to you. That means a more extensive system analysis, and our company's engineers will help you improve the entire system. to meet your requirements.

Features:

1. Provide high-quality white water
2. The production capacity of each unit is 4000gpm
3. Not sensitive to normal production process fluctuations
4. Non-blocking design
5. Effective solid particles
6. Benefits of a closed water system; saving heat energy, reducing fiber loss, reducing effluent treatment costs, and increasing production due to increased temperature.

 Simple operation:

1. Structure

Usually the structure is made of 316 stainless steel or 304 stainless steel, and stainless steel is also used inside. This screening device usually has 100 to 325 mesh holes, and the number of holes depends on the size of the fiber and the specific conditions of white water use. Usually the mesh is Made of stainless steel, it can also be made of synthetic fabric if required by the customer.

2. Diversion

The discharge from the white water filter (white water screen) is divided into two types: filtered white water and unwanted fibers (called extraction liquid). The weight ratio of the white water and impurities flowing through the screen becomes the split ratio. For example, 90/10 means the flow into 90% of the white water in the filter passes through the mesh screen, and the other 10% of the extraction liquid is discarded. The split ratio varies depending on the type and quantity of suspended particles and the mesh parameters. For low-concentration slurries (50-300ppm) The split ratio is approximately 90/10 to 95/5. If the fiber concentration increases, the percentage of extraction liquid will also increase. Larger meshes produce less extraction liquid. The extraction liquid can be sent to the white water system for dilution.

1 Properties of original solution

1. Fluid: papermaking white water
2. Flow rate: 100-120m3/h
3. Viscosity: 1-1.2cp
4. Properties of suspended solids Papermaking fibers and granular additives

E Suspended solids content: 25-38mg/L

7. PH value: 7.5-8.5
8. Temperature: normal temperature 50-80 degrees

 2. Liquid discharge requirements

Meet recycling requirements:

1． After the white water is filtered, it will not block the 1mm nozzle (filtration accuracy requirement is 1/3 to 1/6 of the nozzle)

2. White water is used to clean the mesh screen without clogging it. (The filtration accuracy requirement is about 1/3 of the screen)

3. Analysis of papermaking white water filtration characteristics

The characteristics of white water filtration in paper mills are mainly reflected in the following two aspects:

1. More fibrous impurities

Fibrous impurities have strong penetrating ability in the early stage of filtration. This is due to the large length-to-width ratio of the fibers and the small cross-sectional size of the rear end when oriented in the flow; they also have strong blocking and winding abilities in the later stage of filtration. It is difficult for commonly used filters to carry out precise filtration and precise backwashing at the same time. For example, the screen filter currently commonly used in water filtration has a very low filtration efficiency in the early stage of filtration when filtering white water for papermaking, and it is difficult to backwash clean in the later stage of filtration. Although the sand filter has a good filtration effect, backwashing is almost difficult to perform completely.

B sticky particles contain many impurities

A large number of mineral and organic additives are used in the papermaking process, and these additives work together to form sticky particle impurities. Although this type of impurities is relatively easy to filter, it is difficult to eliminate by backwashing, which also limits the use of traditional filtration systems in this application point.

4. Requirements for filters for papermaking white water

Due to the filtration characteristics of papermaking white water, the filter used must have the following three characteristics:

1. It has the most effective filtering ability for fibers and viscous impurities in white water.
2. Fibers in papermaking white water cannot wrap around the filter media
3. Can effectively recoil trapped fiber and particle impurities

5. Basis for design of papermaking white water filtration system

Although papermaking white water has the above common filtration characteristics, due to the different papermaking processes of each company, the properties of the white water will also be different. The design of the filtration system generally follows the following basis:

1. Choice of filtering form:

Based on the filter requirements for papermaking white water in 1.4, it is difficult for ordinary filters to meet the requirements, and stacked filters can meet the requirements. Therefore, Heying Machinery stacked filter system is recommended.

1. Selection of filter precision:

Since the sizes and clogging mechanisms of fiber and particle impurities in different white water are different, the requirements for the outlet water may also be different, so the requirements for the filtration precision of the filtration system are also different. Our design basis is 1/3 to 1 of the nozzle diameter. /6.

1.6 Description of SPIN KLIN laminate filtration technology for papermaking white water filtration characteristics:

1. The laminated filter medium has a width of 1.4 cm from the outside to the inside. It is a deep filter medium and has the most effective interception ability for impurities such as fiber particles.
2. The width of the laminated filter media is 1.4 cm from the outside to the inside, which is larger than the length of the fiber. The fiber cannot be wrapped around the filter laminate.
3. The SPIN KLIN automatic backwash principle provides the most effective and efficient backwash.

Therefore, we believe that SPIN KIN filtration technology meets the filtration characteristics of papermaking white water and can be applied to the filtration of papermaking white water.