What is a String Wound Fiber Filter Cartridge?

String wound fine filter cartridges are a type of depth filter created by weaving fibers wound around a core. The small fibers are twisted and braided together to form large fibers. The fiber is woven in a honeycomb weave around the core to form a gradient structure that allows for better filtration. The quality of String wound fine filter cartridges depends greatly on the type of fiber used to make the filter core. The material of the core and the manufacturing mechanism are tightly controlled to create the exact required microphone filter slots.

 

The String wound fine filter cartridges is woven to form a density gradient – ​​tighter near the core and softer on the outside. This means that larger particles are filtered out from the start, and as the liquid passes through the filter element, finer particles are gradually filtered out at every layer. The wound winding pattern and controlled thickness of the filter core result in higher dirt holding capacity and increased filter life and efficiency.

Where are String Wound Fiber Filter Cartridge used？

Innovations of wound fibers are commonly used for liquid filtration in industries such as Food and beverage, pharmaceutical, water treatment, mining, chemical, petroleum, gas, exhaust, desalination and automobiles.

Best used for filtration in the following environments:

• Water filtration
• Alkalis
• Dilute acids and alkalis
• Organic acids and solvents
• Potable liquid – clean water
• Oil
• Mineral acids

What are the advantages of String Wound Fiber Filter Cartridge? Why is the wound fiber filter element the best filter element?

The String Wound Fiber Filter Cartridge is widely used in industries and for different types of liquid filtration requirements because of its filtration capacity, high dirt holding capacity, appearance retention ability and longer life. If manufactured with good quality, these types of filters will not collapse, sink, or dent under pressure differences.

How to choose String Wound Fiber Filter Cartridge？

There are four main components to determine the quality of String Wound Fiber Filter Cartridge

1. Core
2. Yarn
3. Endcap
4. Pads

The perfect filter element is a filter element that uses appropriate materials and is woven to perfection to meet the requirements of the filtration application. Strong cores, high quality fibers and high precision manufacturing are some of the desirable qualities to look for in wound fiber filter cores. Good quality materials are used in the production of the filter core, giving it higher filtration capacity and longer life.

Features to look for in a good quality String Wound Fiber Filter Cartridge:

• No chemicals (coating)
• The yarn rolling (wrapping) density is even
• Classify microphone filter slots accurately
• Moves the fiber bundle minimally when touched by hand
• High dirt holding capacity
• Long lifespan
• Stable structure

What if you use a bad quality filter set? Here’s what could happen…

• Creates a large physical groove 

If the fiber used to produce the wound filter core is round and smooth, it can easily move the wound bundle. This fiber displacement/rolling can occur during fluctuations in filter pressure and flow. This breaks down the honeycomb structure and creates gaps between the textile fibers, which affects the filtration efficiency. In this case, achieving the correct microphone rating is an unmanageable challenge..

• Wash away chemicals

Chemical leaching is a serious concern because it affects the quality of the filtrate. Typically, chemicals, resin binders, lubricants, antistatic agents and release agents begin to leach away soon after the filter is put into service. They mix with the filtrate and reduce the efficiency of the filtration process or are dangerous to use especially for drinking water.

The solution is to a) pre-rinse the filter element before installation, and b) let the liquid flow for a while before use.

However, to ensure minimal chemical washout, it is best to use filter cartridges that are 100% free of resin binders, lubricants, antistatic agents and release agents.

• Misalignment in the filter core 

Fiber quality is one of the important factors that create the quality of wound fiber filters. The chopped short fibers tend to loosen and migrate into the filtration liquid. Rough handling, poor packaging, wear and tear during endcap sealing, and inconsistent flow can further degrade quality.

Types of materials for making the core of wound fiber filter？

Popular in the following materials:

• Polypropylene
• Polypropylene filled with gas
• Stainless steel
• Plated steel

Types of fiber materials for making String Wound Fiber Filter Cartridge？

Popular in the following materials:

• Natural cotton
• Bleached cotton
• Fiberglass
• Polypropylene
• Nylon, Rayon
• Polyester and others

Micron rating of wound fine filter core according to filter slot size

The Micron rating indicates the filter’s ability to remove contaminants according to the size of the particles. The quality of the fiber and the quality of manufacturing have a significant impact on achieving a perfect microphone rating. Filters with a 10-micron rating can capture and filter out contaminants as small as 10 microns. A simple example to easily visualize the filter slot size:

• Contaminant as thick as human hair – 50 Microns
  
• Pollutants not visible to the human eye – 40 Microns
  
• The contaminant is the size of white blood cells – 25 Microns
  
• Contaminant the size of red blood cells – 8 Microns
  
• Pollutants are the size of bacteria – 2 Microns

Nominal Micron Rating: Nominal micron rating means the filter is capable of retaining 50% to 90% of the specified micron size contaminants. For example, if a filter has a nominal rating of 50% at 25 microns, that means it will capture 50% of all contaminants 25 microns in size.

Absolute Micron Rating: Absolute microphone rating indicates absolute filtering ability. Filters with an absolute micrometer rating are capable of removing 98.7% or more of specific micrometer-sized contaminants.

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