Stationary Head- The side of the frame without the closure system has a head that aligns with the filter pack. It is also known as the fixed head. It has a feed hole for the slurry to enter and drain hole for filtrate to exit.
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Follower Head- The hydraulic ram pushes the follower head, or thrust head against the filter pack. There are no feed or drain holes on this head.
Closure System- A hydraulic ram is used to press the plates together and hold the filter together during operation. It creates a positive seal and prevents leaks.
Sidebars- The filter press plates rest on sidebars to keep alignment and bear weight.
Pump- Necessary to create the pressure which drives the process, it is usually a positive displacement pump or a centrifugal feed pump.
Extra Features- Newer models can include additional components like plate shifters, spray bars, and automatic cake dischargers.
Plate and Frame Filters- Plate and Frame was the original design, and is still used in some applications. The plate has a series of channels or pips creating high and low points. A cloth or paper filter media sits on top of the plate and filtrate passes through in the drainage area around the low points. The frame creates the empty space necessary for two plates to have a chamber between them. Cake accumulates within the chamber.
Recessed Filter Plates- Recessed filter plates eliminate the need for frames. The plate&#;s border is thicker than the high points of the drainage area, creating half of the chamber. The plate it touches creates the other half.
CGR: Caulked Gasketed Recessed Filter Plates- CGR plates are a recessed plate that has filter media caulked into place, normally in an octagonal configuration. It seal feed and drain holes with o-rings.
Diaphragm Filter Plates- A recessed filter plate with a diaphragm. When solid cake has bridged its chamber, touching both plates, water is pumped into the diaphragm which swells. This swelling decreases the amount of space available, further dewatering the cake. Diaphragm plates are sometimes staggered with recessed filter plates, so that only one side of any given chamber will swell.
While cotton was the main filter media, in the s synthetic fibers created better-performing and longer-lasting press cloths. The Micronics Engineered Filtration Group has a wide variety of fibers, and weave types. Please contact us if you would like to ensure that the cloth your filter uses is the best one for your application.
Drape Over cloth- Twice the length of a plate, a Drape Over Cloth sits on top of the plate and lays down each side. It can be held in place by small nubs, or &#;dog ears&#;.
Drape Over Paper- If the cake has a tendency to blind the filter media after one batch, a filter paper can be draped on top of the cloth. When the Filter Press opens to discharge, the paper is thrown out with the cake.
Duplex Cloth- Two separate cloths, each the size of a plate&#;s single face, are sewn to a gusset that covers the feed hole that runs through a plate. The top and side edges of the cloth either have grommets or Velcro to secure both sides of the cloth to the plate.
CGR Cloth- This Duplex Cloth is shaped to fit in the grooves of a CGR Plate. There is a rope sewn into the cloth&#;s border that gets caulked into each side of the plate.
As filtrate passes through the filter cloth it collects on the plate panel and drains into outlet holes on the corner(s) of the panel. The outlet holes have a channel that goes into the adjacent corner eye. The channel runs between the packing surfaces. Another function of the system is to allow the cake to be dried &#;blown down&#; by compressed air. The manifold piping at the end of the press can be valved to let air into the even-numbered plates pushing the liquid thru the cloth/cake/cloth out the odd-numbered plates. Sometimes particles of precoat and bodyfeed pass through the filter cloth and become trapped within the drainage channels plugging or partially blocking them. It can be easy to overlook, since you can&#;t see into the channels unaided.
The plug likely occurs after a filter cloth tear or if the filter media is too permeable for the precoat and body feed used. The best time to check is when you notice a chamber has not formed a dry, firm cake as it usually does. If some chambers in the filter pack form great cakes and others form wet partial cakes, this could indicate which plates are plugged.
Why is this bypass occurring? Contact us and we&#;ll dig into the specifics of your process to ensure that both your body feed selection and the filter media are the best choice.
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Do you wonder if your operations could function better with a filter press?
This post explains what a filter press is, how it functions, and the process of refining your filter press to improve productivity.
A filter press is a machine that separates liquids from solids. It is useful in a wide variety of industries. Typically, slurry is fed into the filter press, then squeezed against filter plates. That pressure separates the liquid from the solid materials in the slurry. From there, the separated liquid runs through the filter cloth and exits the press, where it is collected. After the separation process is complete, the filter plates have solid material caked onto them and may be removed and cleaned.
There are four different types of filter presses: plate and frame, recessed plate and frame, membrane, and fully automatic. The most common design is the plate and frame model, which is a series of plates and frames that sit between support rails and have filter cloth between them.
Most filter presses have four fundamental parts, including:
The filter press plate is a sturdy plate often made of metal or polypropylene. Depending on construction of the plate, issues such as temperature variations and, pressure during normal operation, are addressed.
Furthermore, filter presses are built with an overhead beam or a side beam to support the filter plates. An overhead beam suspends the plates and supports them from the top. This model is appropriate for high-pressure cloth washing because there is more space between each plate. Overhead beam models also make changing out the filter clothes easier. Side beam models have support beams along the side of the machine, which is beneficial if you have a lower pressure wash system. These machines can also be smaller or even portable.
The filtration press configuration depends on the type of slurry that is passing through the machine and the volume of fluid. Depending on the job, some projects may benefit from additional accessories such as gaskets, scrapers, and air hammers.
The filter press has been an effective tool for dewatering for thousands of years. Initial iterations of presses served the agricultural industry by separating oil from seeds in vegetables, producing tea from flowers, and juice from fruits. It expanded from there to support other industries.
The modern filter presses now consume less energy and are more cost-efficient than other production equipment. By comparison to other machines, it&#;s estimated that a filter press can be 1/6 of the cost of operating a belt press or rotary drum.
While there are varying present-day filtration presses, the plate-and-frame filtration presses are one of the most widely used versions of dewatering hardware.
Let&#;s examine the function of a filter press in more detail. A filter press performs different cycles in the process of dewatering. The process begins with a filling cycle where the slurry is pumped into the press and conveys evenly throughout the mold. From there, solids form on the filtration material, framing the channel cake of each plate. As the plates are pushed together, filtration begins. This process is referred to as strain filtration.
Filtration presses can be operated manually, one cycle at a time. They are also compatible with a pre-programmed, 24-hour cycle(s). Industries like mining or compound assembling plants for wastewater treatment may rely on continuous cycling.
Filtration presses are most effective on slurry consisting of 50-60 percent solids. Slurry with less solids ratios may need to pass through a clarifier first.
When blended, a clarifier and filtration press can purify 90-95 percent of your liquid. The remaining liquid will come out with the solids from the filtration press.
Filter presses are used in a wide variety of industries and commercial settings. Many industries appreciate their versatility, which we will explore next.
For best performance, the filtration media should be customized to support the substance being filtered and the kinds of solids that you are separating.
You can tweak the following factors to accommodate your requirements:
You can also apply extra components such as filtration cloth washing frameworks, a trickle plate, and cake safeguards to enhance the press&#; execution and usefulness.
Also, note that filtration presses come in a wide variety of sizes, from small lab-scale presses to large factory presses.
Many sectors use filtration presses for fluid and solid detachment, including:
Filter Holdings is a principal manufacturer of modern filtration items and premium filters that enhance air, gas, and fluid filtration. Reach out to us today to equip your business with the best filter press for your needs.
Contact us to discuss your requirements of filter press spare parts. Our experienced sales team can help you identify the options that best suit your needs.