Wound filter analysis

Structure and characteristics of wound filter elements

      Wound filter elements are made by precisely winding textile fiber rovings onto a porous skeleton. The winding density is controlled during winding to produce filter elements with different filtration precisions. The filter pore size is larger on the outside and smaller on the inside, resulting in excellent depth filtration performance.

      Wound filter elements are formed by winding textile fibers in a specific way onto a multi-skeleton. Controlling the winding density during winding produces filter elements with different filtration precisions. The filter pore size is larger on the outside and smaller on the inside, resulting in excellent depth filtration performance.

Efficacy of wound filter elements

      Wound filter elements effectively remove suspended solids and particles from liquids. They have a high flow rate and low pressure drop. They have a high filter residue load and a long service life. They can withstand relatively high filtration pressures. Depending on the nature of the liquid being filtered, a variety of different materials are available for the filter element, ensuring good compatibility between the filter element and the filtrate.

Filtration characteristics of wound filter elements

      A good wound filter element exhibits the filtration effect of a depth-type filter material. A structure that becomes increasingly dense from the outside to the inside is ideal. During winding, the density of the filter material must be controlled by the thickness of the wire or by different winding tensions. Only a wound filter element with this loose-outside, dense-inside structure can achieve the depth effect of a depth-type filter material, effectively improving filtration efficiency and intercepting more contaminant particles. The filtration precision of wound filter materials is determined by the thickness and winding density of the wire. The finer the wire, the more tightly it can be packed together, resulting in smaller pores and higher precision. Similarly, the denser the wire structure, the higher the filtration precision. However, during filtration, the filter material must maintain its specific structure and pore size to ensure stable and uniform filtration quality.

      Wound filter elements are a type of depth filtration product. Due to the process characteristics, the filter pore size is smaller inside and larger outside. Impurity particles are filtered and intercepted layer by layer, resulting in a high mud cake load capacity, strong dirt holding capacity, effective removal of suspended solids, particles, and metal oxides from liquids, and the ability to withstand higher filtration pressures. They have a high flow rate, low pressure difference, and high filtration efficiency. Wound filter elements are reasonably priced, can be backwashed and regenerated, have a long service life, small size, and are easy to replace.

Main uses of wound filter elements

1 Food and beverage industry: mineral water, syrup, liquor, edible oil, beverage water, cola drinks, etc.

2 Electronics industry: pure water, organic solvents, printed circuit boards, electroplating, etc.

3 Petroleum and chemical industry: petrochemicals, pharmaceuticals, cosmetics, coatings, photosensitive liquids, inks, acrylic fiber raw materials, photographic processing solutions, oils and fats, etc.

4 Industrial oils: hydraulic oil, lubricating oil, cutting oil, and various other industrial oils.

5 Pharmaceutical industry: syrup, alcohol, preparation water, VC raw materials, tetracycline solution, oxytetracycline solution, injection preparations, etc.

6 Others: resin lenses, bearing cleaning, laser cooler water, ultrasonic cleaning solution, electroplating solution, etc.

Technical parameters and usage precautions for wound filter elements

1 Filtration precision: 1μm, 5μm ， 10μm ， 20μm ， 30μm ， 50μm ， 75μm ， 100μm 。

2 Filter element outer diameter: φ60mm ， φ65mm 。

3 Filter element inner diameter: φ28mm ， φ30mm 。

4 Polypropylene wound filter elements can be used with water, acids, alkalis, chemical solutions, and other non-organic solutions. Operating temperature ≤60℃ 。

5 The central rod of the degreased cotton fiber filter element is made of stainless steel and is used for organic solvents, water, oil, alkaline solutions, beverages, pharmaceuticals, etc. Operating temperature 120℃ 。

6 Filter element length: 10″ ， 20″ ， 30″ ， 40″ 。

7 Maximum pressure resistance: ≤0.5MPa ; Maximum pressure drop: 0.2MPa。

8 Maximum operating temperature: Polypropylene yarn: Polypropylene skeleton ≤60℃ ; Stainless steel skeleton ≤80℃ . Degreased cotton yarn: Stainless steel skeleton ≤120℃ 。

Precautions for using wound filter elements

1 Diameter of filtered medium particles

      Precision of wound filter element 1-100 Microns. The appropriate precision must be selected based on the medium being filtered. If fine precision is used to filter very dirty water, the service life of the filter element will be significantly reduced. Therefore, it is essential to know the diameter of the filtered medium particles to reasonably select the filtration precision.

2 Acidity and alkalinity of the filtration medium

      There are three raw materials for wound filter elements: PP such as absorbent cotton and glass fiber, PP are commonly used in water treatment, mainly for filtering neutral or weakly acidic and alkaline liquids. Absorbent cotton and glass fiber can filter strong acids and bases.

3 the temperature of the filter medium

      The framework of wound filter cartridges includes PP and stainless steel. The raw materials are also introduced above, PP framework and PP The raw materials have a lower temperature resistance, while stainless steel framework absorbent cotton and glass fiber have a higher temperature resistance.

4 the pressure of the filter medium

      This is related to the filter cartridge framework, PP Frameworks with low pressure resistance, stainless steel frameworks have high pressure resistance. When the pressure is low, pressurization is required; when the pressure is high, pressure reduction is required. Reasonable selection of the framework can also address this.

      The main problems with wound filter cartridges are the retention of dust within the filter material fiber layer, incomplete and uneven pulse backwashing cleaning, etc. This leads to poor regeneration ability of the wound filter cartridge, increased residual pressure drop, excessive system operating resistance, reduced application efficiency and lifespan of the wound filter cartridge. Attention should be paid during use.