Attentions During Filter Press Operation (Part 1) ●During machine trial operation, make sure the hydraulic oil is filled according to this manual. Otherwise the unfilled oil cylinder will cause abnormal operation of the hydraulic power unit, or even the damage to the hydraulic pump. ●Replace hydraulic oil regularly according to this manual and clean hydraulic valve and pump timely, or the normal working condition of the hydraulic power unit will be hindered.●Filtration pressure should not exceed the normal filtration pressure of the PP filter press, or it will cause breakage of the PP filter plates.●The “filtration pressure” on the label refers to the testing experiment pressure. During usage, due to the property of the material, the actual bearing filtration pressure may be lower than the “filtration pressure”. Users must do sufficient experiments, then confirm the parameters, NANXING is not responsible for the damage of the equipment and liability for loss caused by it.●Personnel without training for hydraulic filter press operation and system maintenance should not open the electrical control cabinet to connect the wires alone, or wrong connection of the wires may lead to error action of the filter press.●Shut off main electric power supply switch of the PP filter press during maintenance.●The remained filter cake on the sealing surface should be cleaned away before a new filtering cycle, otherwise, the side bars may distort, the filter plates break, and filtrate leak, all of which are not within the “Three Guarantees”.

 Filter Cloth Installation     The filter cloth may shrink or distorts when using due to change of temperatures, pressures and textile methods, influencing the filter press filter result. Due to the uneven quality of filter cloth on the market, it’s suggested to purchase filter cloth from the original supplier. If the user selects the filter cloth model independently or produces the filter cloth himself, which lead to un-installation of filter cloth or bad filter result or even no filter result, he himself takes the responsibility.How to Install Filter Cloth On Filter Plates 1. When installing the filter cloth bag, roll up one cloth sheet in direction cloth collar from two sides, fold up the two rolled up parts to the centre, pass them through the feeding hole of the filter plate, unroll them on the other side and bind the two cloth sheets together by means of bands. (Refer to Figure e: installation diagram of filter cloth bag)  2. Attentions during installationThe filter cloth should be wrapped on the filter plate smoothly when binding.Take care to distinguish the filter cloth for recessed plate and membrane plate if membrane filter press model.3.  Attentions during use The withholding performance of filter cloth might get inclined due to blocking by the materials after a time of use. The user needs washing and regenerating them regularly. If the wash result is not satisfactory and the filter cloth becomes stiffen, it should be soaked (normally 24 hours) by low density light acid or light alkaline liquid to neutralize it and recover its performance. If still can not work well, the filter cloth should be changed to new ones.

The property and pattern of filter cloth will directly effect filtering result. So choosing filter cloth is a very important thing in the filter press work. Nowadays the filter cloth is made of synthetic fibers. According to materials there are polyester fiber, polyvinyl alcohol fiber, polypropylene fiber and polyamide fiber. Their properties are as followings: Properties  Polyester  Polyamide Polypropylene PolyvinylAcid-resistantVery goodnot goodgoodBadAlkali-resistantnot goodgoodvery goodvery goodConductibilitybadbettergoodCommonBreaking Stretch30-40%18-45%>30%12-25%Recoverabilityvery good>90% when10% stretchgoodnot goodWearabilityvery goodvery goodgoodBetterHeat-resisting1700C1300C less   contraction900C less   contraction1000C contractionSoftening-point230-2400C1800C140-1500C2000CMelting Point255-2650C210-2150C165-1700C2200CNote: The polyester can not resist strong sulphuric acid and heated formic acid.  The polypropylene can not resist strong nitric acid, chlorosulfuric acid, strong caustic soda, strong acetic acid, acrylic acid and chloro-aromatic hydrocarbon.     Besides, for the better interception result and filter press filter speed, choose filter cloth according to the granularity, density, viscosity, chemical composition and filtering technology conditions. Due to variety of filter cloth material and pattern, there are different strength, extension percentage, penetration and thickness of filter cloth, and thus the different filtering efficiency. In addition, the cotton cloth, adhesive-bonded fabric, mesh screen, filter paper and porous membrane also may be used for filtering medium. If you need any consultation service please contact NX filter press supplier.