- About channel material
1) Filter fabric material
Polypropylene channel material: the benefits are smooth surface, less burr, great air porousness, great detachment of channel fabric and channel cake, corrosive and soluble opposition in the center.
Polyester channel material: the benefits are solid corrosive and antacid opposition, great versatility and recuperation, great wear obstruction, great hotness opposition and deformity security. The disservice is that the electrical conductivity is exceptionally poor.
Nylon channel fabric: the benefit is that it is impervious to solid soluble bases and frail acids, and is the most wear-safe, with multiple times more wear opposition than cotton filaments. The impediment is that it isn’t impervious to light and is handily stained and fragile, so nylon texture ought not be presented to daylight for quite a while, while its synthetic properties are temperamental and can undoubtedly deliver hints of destructive substances, so it can’t be utilized in food handling and different ventures utilized for the human body.
Vinylon channel texture: the benefits are solid antacid obstruction, great scraped spot opposition, consumption obstruction, sturdiness of 1-2 times more than cotton, and solid dampness assimilation. The weakness is that it isn’t impervious to high temperatures, the separating temperature can’t surpass 60°, the temperature will shrivel assuming it comes to 100°, and it isn’t corrosive safe.
The real choice interaction can be founded on the accompanying standards: as indicated by the substance properties of the filtrate, for example, acridity and alkalinity to pick, the most grounded corrosive obstruction is polyester channel material, the most grounded basic opposition is vinylon channel fabric, corrosive obstruction, alkalinity in the center is polypropylene channel material; as per the temperature of the filtrate to pick, high temperature opposition is polyester channel material; as per the stripping execution of the channel slag to pick, the best partition impact is polypropylene channel fabric; as per the state of the channel slag, molecule consistency, hardness, according to the point of view of wear protection from pick, great wear opposition is polyester channel fabric and nylon channel material.
There are four kinds of yarn structure: staple yarn, fiber (compound yarn), monofilament and compound yarn. For the normal kinds, polypropylene and polyester have staple yarn, fiber (compound) and monofilament, while nylon has fiber (compound) and monofilament types; Vylon has just one sort of staple yarn.
The twist and weft of monofilament yarn is a silk, the surface is smooth, difficult to obstruct, air penetrability, water porousness, and the channel cake is not difficult to strip off and recover, higher filtration proficiency, simple to dump, and inconsistent cleaning, long assistance life. The twist and weft of fiber are comprised of different strands woven into one fiber, which has a superior maintenance impact on fine particles. Under the reason of meeting the necessities of filtration accuracy, the impact of monofilament channel fabric is superior to fiber channel material. Monofilament channel material is ordinarily utilized for channel proceeds sewage.
(3) Filter fabric weaving strategy
Normal channel fabric weaving strategies are: plain, twill, silk. Plain, the most thick, little pores, great molecule capture attempt impact, clear filtrate, yet obstruction, simple to impede, difficult to dump slag; twill, among plain and silk, solid enemy of contact, separating speed, long assistance life, generally utilized; silk, huge pores, difficult to hinder, filter press manufacturers great muck stripping impact, however helpless molecule interference impact, turbid filtrate.
Slop during the time spent channel press, channel fabric to over and again channel press process should have a specific pliable, compressive strength, that is, the mechanical properties of the channel material to be great. As slop molding process, to change it up of synthetic substances, like PAM, lime, iron salt, and so on, as a general rule, after the molding of the ooze is for the most part basic, so the channel material should be great consumption obstruction, with soluble base opposition. The muck is generally natural slop with little particles, so the channel fabric needs to have great sifting execution, which can rapidly eliminate the water from the separated material, and furthermore difficult to impede, for example great slime stripping execution. The channel fabric is not difficult to clean and recuperate rapidly after filtration, hence broadening the assistance life and decreasing expenses. In synopsis, i.e.: high mechanical properties, consumption obstruction, quick and clear filtrate filtration, difficult to stop up, simple slime stripping, long life, so the computation, polypropylene monofilament twill channel material is a decent decision.
- About channel plates
1) Filter plate material
Elastic channel plate: great flexibility, yet helpless strength.
Aluminum channel plate: the lightest of the metal channel plates, yet helpless corrosive obstruction.
Cast iron channel plate: significant burden, helpless corrosive opposition, high temperature obstruction.
Hardened steel channel plates: great protection from acids and salts, however exorbitant cost and long handling time.
Polyvinylidene fluoride (PVDF): great corrosive obstruction and high temperature opposition, however exceptionally helpless salt opposition.
Polypropylene channel plates (PP): most regularly utilized, with high strength and sturdiness and high scraped area obstruction. Normally, TPE elastomer and salt free glass fiber can be utilized to upgrade and change the PP channel plate, with the goal that the channel plate has solid durability and unbending nature, which thus further develops the fixing execution of the channel plate, erosion obstruction, temperature opposition up to 150℃, and pressure obstruction up to 2.0MPa.
There are three types of channel plate squeezing: manual squeezing, mechanical squeezing and water powered squeezing. Manual squeezing is a screw jack to push the squeezing plate squeezing; mechanical squeezing is an electric engine with H-type minimizer box, through the rack drive parts to push the squeezing plate squeezing; water powered squeezing is a water powered station through the water powered chamber parts on the rack to push the squeezing plate squeezing. The normal one is water powered squeezing.
(3) Liquid release technique
There are two kinds of fluid release strategies: open stream and dim stream. The filtrate is released straightforwardly from the power source opening of each channel plate, which is known as the open-stream type. The open-stream type is advantageous for checking the filtration of each channel plate, and assuming the filtrate of a specific plate is viewed as sullied, the power source of that plate can be shut. In the event that the filtrate from each plate is joined and released from the machine through a release pipe, it is known as the dim stream type. The dull stream type is utilized for the filtration of suspensions where the filtrate is unstable or where the filtrate is unsafe to people. It is normal to have an open-stream fluid.
4) Washing strategy
As indicated by whether the channel buildup should be washed, it very well may be isolated into two structures: launderable and non-launderable. Launderable channel presses have two kinds of channel plates, those with openings for washing fluid bay are called punctured channel plates (likewise called washing plates) and those without openings for washing fluid delta are called non-punctured channel plates (additionally called non-washing plates). One-way washing is a mix of punctured and non-punctured channel plates set then again; two-way washing channel plates are punctured, yet the washing of two adjoining plates ought to be amazed and can’t go through the washing fluid simultaneously. The accompanying washing designs are normal: dull stream one-way, dim stream two-way, open stream one-way, open stream two-way.
Disguised one-way stream washing: the washing fluid enters the punctured plate thus from the washing fluid bay opening of the plug plate, goes through the channel fabric and afterward through the channel cake, and streams out from the non-punctured channel plate.
Dim stream two-way washing: the washing fluid is washed two times from the two washing fluid delta openings on the two sides over the plug plate, for example the washing fluid is washed from one side first and afterward from the opposite side, the power source of the washing fluid is slanting bearing, so it is additionally called dull stream two-way cross washing.
Open stream one-way washing: the washing fluid enters the punctured plate from the washing fluid delta opening of the plug plate, goes through the channel fabric and afterward through the channel cake, and streams out from the non-punctured plate.
Two-way washing: The washing fluid enters the openings from the two sides over the plug plate and is washed two times, for example from one side first and afterward from the other.