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Acrylic filter bags are a type of filter bag made from acrylic fibers, which is a synthetic fiber that is known for its durability, chemical resistance, and heat resistance. As a dust filtration media, acrylic felt has the following characteristics:
Particle Retention – Acrylic filter bags are highly efficient in retaining particles, thanks to their intricate pore structure. These bags can capture particulate matter of various sizes, ranging from coarse to fine particles.
Chemical Resistance – Acrylic fibers possess excellent resistance to a wide range of chemicals, making them suitable for filtration applications where aggressive chemicals are being filtered.
Temperature Resistance – Acrylic filter bags exhibit good thermal stability, allowing them to withstand elevated operating temperatures. They can typically operate in the temperature range of 120°C to 150°C (250°F to 300°F), making them suitable for filtration processes that involve hot gases or liquids.
Hydrolysis & Moist Heat Resistance – Acrylic fibers have low water absorption properties, enabling the filter bags to maintain their filtration efficiency even in high-humidity environments with mild chemical attacks. Where polyester filter bag is not suitable because of potential hydrolysis, acrylic filter bag offers a combination of abrasion and moist heat resistance, particularly under acid conditions.

In addition to these filtration characteristics, acrylic filter bags also offer a number of other advantages, such as:
Cost-Effective – Acrylic fabric is relatively inexpensive compared to other high-performance filter media materials, making it a cost-effective solution for a wide range of industrial filtration applications.
Versatility – Acrylic filter bags can be customized to meet specific filtration requirements, including shape, size, and surface finishes. Additionally, they can be designed to fit different types of dust collectors, allowing for easy installation and replacement.
Long Service Life – Acrylic fibers are known for their durability and resistance to degradation, resulting in extended service life. This reduces the need for frequent replacement, saving maintenance costs in the long run.
Resistance to Abrasion – Acrylic filter bags demonstrate excellent resistance to mechanical stress and abrasion, preserving their filtration efficiency over time, even in demanding industrial environments.

Scrim-supported felt is used exclusively in the production of our acrylic filter bags in order to improve filtration efficiency and extend the filter bag life.

Dust Collection Characteristics

Acrylic filter bags have emerged as a versatile and cost-effective solution for many industrial filtration applications. Their exceptional filtration characteristics, compatibility with chemicals, and moderate temperature & hydrolysis resistance make them suitable for diverse industries such as cement, pharmaceuticals, food processing, and textiles.

Advantage

Excellent resistance to most common organic solvents. Excellent resistance to hydrolysis and moist heat.

Disadvantages

Inferior alkali resistance, limited high temperature applications.

Industry & Application

Cement & Limestone Industry, Power Generation Industry, Pharmaceutical Industry, Food Processing, and Textiles.

Construction & Treatment

Acrylic 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 Acrylic 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 an acrylic 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.
 
PTFE Coating
The filter media is coated in a bath or spray of liquid PTFE resin. This is done to protect filter bags. The treatment improves the flex life, heat and chemical resistance, and dust release from the filter bags. This increases the service life and filtration efficiency. PTFE finish is commonly used in applications with corrosive chemical compounds, sticky dust, or high moisture contents.
 
Hydro-Oleophobic Coating
This coating adds resistance to water and oils, and improves cake release.
 
Static Resistant
Helps to ground the filter bag to eliminate sparks that might cause combustion explosions.
 
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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