I want to know what is the shrinkage and elongation of press filter cloth
Use of filter press, filter for different objects have different requirements of filtering accuracy, speed, is through the use of filter press cloth and press different bag achieve. Each piece of filter board is cloth package, to filter objects of different acid and alkali resistance, tensile strength, filtering accuracy first, the filtration speed requirements, determine the use of filter material, then according to the model, filter plate size, shape, processing and matching cloth bags, can be set in the filter so that the filter cloth is above the heart, so it is in the press. In 1, the cloth shrinkage in the frame and the large box type filter in the plate, the cloth contraction can have a serious problem. According to the data, the top to the chamber filter plate material, filter cloth caused trouble, less central to the chamber plate material. The cloth is reused, washing and drying, will be added Play a role in contraction, polyamide bouilhou very wet storage. If possible, suggestions in order to ensure the dimensional stability of cloth cloth.
Preferred Instead of using a box type filter plate frame, easy to realize mechanization (chamber plate easy to unload the cake). With the board size has steadily increased to 2m * 2m, and the emergence of various drainage device, the filter mechanical strength higher requirements. From the change frame box type filter plate, filter cloth deformation this requirement is increased, with greater resistance to the elongation of the cloth at work. For example, the original manual operation in polyester cloth filter press, the fracture load is 900N/cm (Meridian) and 350N/cm (weft). Now, in the same size box type filter plate on the polyester cloth, the fracture load has increased to 1800N/cm (Meridian) and 1600N/cm (weft). Used in sludge dewatering by filter press this cloth, than the centrifuge and belt press dehydrator.
In the work, should be on the fabric pre shrinkage, there are two methods: (1) pre contraction of the filter in the relaxed state, with boiling water pre contraction; (2) in weft tension state and the filter cloth is heated in the thermostat (constant porosity and permeability). 2, the cloth to absorb the liquid after elongation, fiber and yarn elongation. The increase of fiber diameter and length, will change the size of the cloth, which bring serious consequences to the filter plate assembly. Accurate filter cloth made of various materials, the water absorption the rate is different, some cloth 4% is the weight of the water absorption rate (nylon), while some only absorb 0.4% (such as terylene). The development of automatic filter press , characteristics of the fabric have higher requirements.
