Top Applications for Liquid Filter Bags in Various Industries

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Liquid filter bags are a great solution for a variety of industrial filtration applications. They help minimize downtime, reduce waste disposal costs, limit worker exposure to hazardous liquids, and ensure final products meet strict quality standards.

Polyester and polypropylene fabric liquid filter bags are acid and alkali resistant, have a high strength mechanical structure and long fiber, which provides good durability and repeated use. They also feature a special singeing process that prevents the fiber from detaching and polluting the filtrate https://ztfilterbag.com/
Hydraulics

Filtration systems are a necessary component of many industrial processes. They prevent machines from malfunctioning and help keep contaminants out of the air, water and other liquids in order to promote sustainability. One of the most important types of filtration systems are bag filters. They are a type of filter that works with liquids and consist of receptacles that contain some sort of filtration material, usually woven fabrics. These are then supported by various styles of housings that may or not be equipped with lids. These lids may either be clamped shut, bolted closed or hinged.

Bag filters can be used in a variety of applications, but they are commonly found straining and cleaning liquids in environments like hydraulics. They are specifically designed to help clean and maintain the integrity of lubrication oil, which helps reduce the risk of system failure caused by impurities. They are also a great way to reduce the frequency of oil changes and other related expenses.

While there are many different ways to construct bag filters, most consist of some sort of woven material, whether it is a non-woven, felt or membraned fabric. The size of the holes or pores in the filtration fabric determines the kind and size of impurities that will be blocked, and also the rate at which the liquid is able to flow through the bags.

In some cases, filter bags are constructed from materials that provide graded density filtration, which allows for higher efficiencies at lower micron ratings. Donaldson’s premium LifeTec bag filter elements are an example of this, and utilize a multilayer configuration that includes a needle punched felt outer layer for pre-filtration. This provides a higher dirt-holding capacity, and can lead to longer filter life compared to standard POMF or PEMF bags.

In addition to bag filters, there are also cartridge filters, which use modular filter media inserted into housings that work with a wide range of applications and environments. They are a cost-effective and simple way to handle a variety of filtration needs, including water purification. They are available in depth and surface types, and micron ratings that reach up to 110 microns.
Food and Beverage

In the food and beverage industry, bag filters filter liquids to remove unwanted impurities. They are used for several different processes including brewing, winemaking and distilling. In these applications, tighter bags are used to separate grains from sugars during the brewing process, while looser bags are used in the final stages of filtration before bottling. These filters help prevent the loss of flavor and aroma by filtering out particles that would otherwise contaminate the product.

Liquid filter bags can be made of a variety of materials. Some include polypropylene, polyester or Nomex. They are manufactured using FDA Title 21 compliant production materials and are available with a range of micron ratings and sizes. Some also feature a needle punched felt layer to provide pre-filtering for extended life and high efficiency.

The size of the pores in a filter bag determines how large of an impurity it can capture. This information is essential when determining the type of filter to use in your application. If you have a highly viscous or dense fluid, you may require a thicker material with larger pores, which will allow for greater flow rates while still maintaining efficiency and particle retention.

Another factor to consider is whether your fluid requires sterilization. If it does, you'll need a specialized type of filter that will withstand high temperatures and pressures. Some types of bag filter can even absorb unwanted trace oils that often occur in processed fluids. This is important because these oils can damage your equipment.

These specialized bags are also ideal for filtration in the oil and gas industry. These bags have a layer of porous cellulose on the inside that adsorbs unwanted oils from the filtrate. This adsorption helps to extend the life of the filter and can be recycled repeatedly.

These filter bags are used in a wide range of industrial applications, such as hydraulic and lubrication systems, metal machining and food and beverage. They are designed to protect pumps, nozzles and valves from harmful contamination. They can also be used to filter a wide range of chemicals and slurries, including paint, coolants, water, pharmaceuticals, oil and gas and foodstuffs.
Oil and Gas

Bag filters are used in liquid filtration applications in oil and gas industries to remove solids and impurities from the process fluid. These processes often require a high level of cleanliness and sanitary operation. Bag filter housing can be made from a range of materials to meet these needs. Plastic can be a good choice for some applications while stainless steel is better suited for more demanding operations where a higher level of safety and durability are required.

Most liquid bag filters operate as depth filtration with a fluid entering the filter from the top and exiting at the sides and bottom. Depending on the type of bag construction and the material the dirt-holding capacity can vary significantly. Needle felt bags, for example, utilize the proven mechanisms of depth filtration and have a high dirt-holding capacity. Mesh filter bags also have a strong, reliable dirt-holding capability and are typically made from woven polypropylene or polyester fabrics that are needle punched with a variety of thread diameters and weights to produce a multi-layered depth filter media.

These multiple layers create a high dirt load capacity that reduces differential pressure drop and offers excellent chemical compatibility. Trinity Oil Absorbent Bag Filters are a new generation of multi-layer bag filters that offer effective oil removal properties from processing fluids. These filter bags have been designed to work well in temperatures up to 200°F and can handle a variety of liquids including water, glycol, naphtha, waste vegetable oil, and oil sands.

The welded version of these bags, commonly known as “Sure-Weld” bag filters, are constructed using cutting edge welding technology to bond the needle punched nonwovens. This results in a stronger and more reliable bag that is ideal for applications where the bags are exposed to high temperatures or harsh chemicals. The welded seams are stronger and more durable than sewn snap rings and the bags can be safely sealed together without risk of leakage.

Strainrite’s Sure-Weld bag filters are available in a wide variety of micron ratings and can be fitted to any standard liquid filter housing. The bags are manufactured with a sanitary welded seam and are supplied with a galvanized or stainless steel snap seal ring that can be fitted to the outer diameter of the bag. This makes it easy to identify when the filter needs to be changed and allows for a positive sealing arrangement that helps prevent bypass flow.
Brewing and Distilling

In brewing, bag filters are used to catch impurities that are released from the grain during mashing. This helps prevent the mash from getting polluted and it also ensures that the wort is free of any foreign matter prior to boiling. The brewing industry also uses bags to filter beer during the fermentation process and to remove any particles that may be a result of the aging of the whiskey or other liquors.

Distillers also rely on filtration to protect their products. The filtration process can help to improve the quality of the final product by removing contaminants that mask the high-quality components that contribute to taste, color and mouthfeel. In particular, distillers need to filter out contaminant particles that can adhere to other ingredients and spoil them.

Bag filters for brewing and distilling are available in different sizes and materials, depending on the application. In general, bag filters are used in the mashing phase of the brewing process to catch larger sized particles, such as barrel char or fruit and spice particles. They are also used in later stages of the brewing and distilling processes to remove the last vestiges of haze. For example, some distillers use finer pore-size membranes to filter their spirits during the aging process.

Some facilities also use lenticular depth filters, like Pall SUPRApak, to filter their spirits before bottling. These depth filters utilize an innovative edge flow design that maximizes surface and adsorption mechanisms for a better filtrate quality. This type of filter can also eliminate the need for chilling to remove lipids and long-chain fatty acids that could spoil the final product.

For brewery and distillery applications, disposable filter bags are often made from either a non-woven or felt material, as well as from a variety of fabric weaves. They can be made with a variety of finishing options, including a singed or glazed finish that reduces fiber migration. They can be available with or without a plastic collar to help seal them in conventional bag housings. The plastic collar version features a stainless steel ring for added strength and is engraved with the micron grade and manufacturing lot number to provide traceability.