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PPS filter bags are made from polyphenylene sulfide (PPS), which is a high-performance thermoplastic polymer, also otherwise known by the proprietary name Ryton© or Procon©. Polyphenylene sulfide filter bags are known for their excellent filtration characteristics, including:
High Temperature Resistance – PPS filter bags can operate continuously at temperatures up to 160°C (320°F), with surges up to 190°C (375°F). This makes them ideal for applications where high temperatures are present, such as in incinerators, power generation, cement production, and metal processing.
Excellent Chemical Resistance – PPS filter bags are resistant to a wide range of acids, alkalis, and solvents. This makes them suitable for applications where corrosive chemicals are present, such as in the chemical processing and pharmaceutical industries.
Good Moisture Resistance – PPS filter bags are also resistant to moisture and hydrolysis. This makes them a good choice for applications where high humidity or wet conditions are present, such as in food processing and wastewater treatment.
High Mechanical Strength – PPS filter bags have a high tensile strength and tear resistance, making them resistant to abrasion and tear. This is important in applications where the filter bags are subjected to high levels of wear and tear, such as in the mining and construction industries.

In addition to these filtration characteristics, PPS filter bags also offer a number of other advantages, such as:
Long Service Life – PPS filter bags have a long service life, even in challenging operating conditions. This can lead to significant cost savings over time.
Easy to Clean and Maintain – PPS filter bags are easy to clean and maintain, which helps to reduce downtime and improve productivity.
Environmentally Friendly – PPS filter bags are made from a recyclable material, which makes them an environmentally friendly choice.
Scrim-supported felt is used exclusively in the production of Aokai PPS filter bags in order to improve filtration efficiency and to extend the filter bag life.

Dust Collection Characteristics

Aokai’s high-performance PPS filter bags offer a number of unique advantages, including high-temperature tolerance, excellent chemical resistance, high mechanical strength, and excellent filtration efficiency. These properties make PPS filter bags an ideal choice for a wide range of demanding industrial applications.

Advantage

Excellent resistance to high temperature, acids, alkalis and moist heat, high mechanical strength, and excellent filtration efficiency.

Disadvantages

Sensitive bag to cage fit, cost.

Industry & Application

Asphalt Industry, Cement Industry, Metallurgy Industry, Power Generation Industry, Chemical Industry, Carbon Black Industry

Construction & Treatment

PPS filter bags are typically made from non-woven PPS felt. The PPS felt is made up of individual PPS fibers that are bonded together to form a porous material. This PPS felt filter media can be constructed and treated with various options so that they become best suited for various operating conditions, applications, and industries.

Filter Media Construction

Needle Felting
Needle Felting is a traditional non-woven fabrication process by punching a fiber batt into itself to hook and entangle fibers which then form a thin, relatively dense structure, either with or without a light woven support scrim. Needlefelt filter media have smooth surfaces and offer good depth filtration and particle capture. To further improve filtration efficiency and filter bag life, Aokai custom designs and manufactures Dual-Density PPS Filter Media. In a genuine dual-density filter media, two layers of media of different density are separated by a scrim in the middle that provides dimensional stability and a densified central core which improves filtration efficiency by minimizing dust migration through the felt. The scrim structure offers a clear advantage over unsupported felts (without scrim) which are produced in a single process with a homogeneous fiber blend and filtration characteristics only.

Filter Media Treatment

ePTFE Membrane
Adding an ePTFE membrane to a PPS filter bag allows the membrane to act as the filter cake. Dust stays on the surface of the membrane and does not get entrained into the fibers of the filter bag, which lengthens the filter bag life. It also reduces wear and tear, lower maintenance costs, and energy costs due to easy dust cake release during the cleaning cycle.
Hydro-Oleophobic Coating
This coating adds resistance to water and oils, and improves cake release.
Singe
This treatment process removes straggly fibers from the filter material and provides a uniform surface area which improves cake release.
Glazing
Glazing, also known as calendering, is the high-pressure pressing of the fabric by rollers to flatten or smooth the surface. Glazing pushes the surface fibers down onto the body of the filter media to increase and uniform surface life, improve stability, reduce shrinkage, and improve dust cake release.
 
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