subject: Melt Filters Spunbonded Nonwoven Production Line Application - Melt Filter - Filtration And [print this page] Abstract: Different types of melt filters have different structures and functions. This paper introduces the domestic spunbonded nonwovens production line in the main application of the three types of melt filters and filters of different filter materials used in the performance index, pull out and the filter type and filter material selection and Spunbond Nonwoven close relations of production of cloth.
In chemical fiber spinning and the production of plastic extrusion process, the mixed melt impurities would not only affect product quality, but also hinder the normal production. To this end, after the extruder are equipped with filters to separate the impurities melt, to ensure the stability of the production line. In addition to melt level
pure direct impact on product quality, there is one important factor is the rise in raw material prices as, in order to reduce costs, increase profits, enterprises to increase the recovery of materials and the use of inferior materials ratio, so on a higher melt filtration requirements. Therefore, the filtering technology has attracted widespread attention at home and abroad.
1 Classification of melt filters Carrier by the filter can be divided into disc shape, slide type, plunger, filter chamber, etc.; according to changing network conditions during the production of rapid change can be divided into network-based, non-stop for web-based; by power source can be divided into manual, hydraulic, pneumatic, electric, etc.. In addition, it can filter types, shapes, the number of flow classification. The following will be applied at home and abroad by the main function of melt filter is divided into four categories, listed in Table 1.
1.1 swift net filters Fast network is used for manual lever, hydraulic mobile installed in the disk or skateboard on the filter, use the mesh-type filter elements, filter change than the early flange fastening net short time.
1.1.1 Disc swift net filter
Disc was skateboarding fan structure, the board has two filter elements. This filter extrusion process because of the gradual accumulation of filtering impurities in the filter surface, the hole part of the filter will be blocked, resulting in a screw driven by the rapid increase in melt pressure before the filter. When the pressure exceeds the pressure on the filter, the filter will break down, will affect product quality, resulting in waste seconds. When the need to replace filters, the need to stop the host, and then operating leverage, fan-shaped slide will move the blocking element out, change into a clean filter element, so the production process is not continuous.
1.1.2 Single skateboard swift net filters
Skateboard rectangular structure, the board for two round holes, each hole is equipped with a filter element. With a porous filter elements of care by a network of panels and three stainless steel mesh, of which the middle one for the fine filter (filter pore size is small), mainly by fine melt filtration filters to ensure that. Fine mesh filter and trust between the filter plate is used to support the skeleton of fine mesh filters. Skeleton network of mesh selection is important, if the number of large projects, networks of small diameter wire, the pressure on the limited use easily squeezed break; if the mesh used in the skeleton of the small, large diameter wire network, then Fine filters may be some holes from the skeleton network breakdown. This filter, also first stop for web hosts, and then operating a power screw or pneumatic, hydraulic piston to move the slide.
1.1.3 Single-piston rapid filter changer
Skateboard filter structure with a single difference is replaced by the cylinder piston will slide.
Above products for network hosts when they should first stop, interrupt the melt, and then switch the filter, there are the shortcomings of the production process is not continuous, but are equipped with mesh filter element type, the smaller filter, filtering accuracy is not high enough.
1.2 non-stop for net filter
Shut down to change the filter network may be non-stop, do not interrupt normal production circumstances replace the filters. And rapid filter changer, an increase of a skateboard or a plunger, both melt to flow in the shunt was filtered. Exchange network, as long as a skateboard or a plunger filter out, and cut off the flow, melt, or the plunger can slide through another filter to filter on.
1.2.1 Dual slide-style non-stop for net filter
The filter has two slide, each slide is installed filters. Use of skateboards melt channel opening and closing movement to replace the filter. Work can be turned on equipment, or skateboard on the two filters simultaneously, thus ensuring a continuous process, increasing production, energy saving, no waste.
1.2.2 dual-piston non-stop for net filter
Compared with double-slide type, the filter is replaced with a plunger slide, it works the same with the double-slide type.
Non-stop for web filter for an exhaust when network problems to be solved. Usually in the net after net with overflow exhaust channel, for nets to be sealed in the filter in the air flow through the net after net overflow discharge port. When the filter is filled with melt and flow to the working position, the overflow port being blocked, not only ensures the continuity of the production process, but also because the air is sealed to prevent the material in the production of the disturbance caused.
Above two categories for net filter, strictly speaking should be called the changer. Nature of the problem is the selection of mesh filter elements filter area can not be great. General mesh 150mm diameter below even the four-channel dual-piston area of 0.1 m2 only in the following. As science and technology and folding candle-shaped filter mesh appearance, so that the filter melt filter area with a leap.
1.3 filter valve switch
Trap valve used for switching the two-filter chamber, filter chamber is stainless steel thick-walled enclosure, built-in multi-root candle-shaped filter, the filter by the folding-type porous stainless steel coated stainless steel mesh tube made of double rooms at both ends of the export pipeline connecting the melt through the valve and the valve structure can be two three-way valve or four single-valve, double-room arrangement and horizontal separation of two. Filter made of folding is intended to increase the filtration area. 3 layer filter 5 layer, the melt from flowing through the filter, the control center from one end of the pool and out. Play the role of the middle layer of filtering the smallest pore size filter, generally required use square mesh, I-shaped mesh, metal fiber felt, sintered metal net. The outer protective fine mesh filter from the injury, the inner net is skeleton network. In use, indoor candle-shaped filter cartridge as filter clogging impurities, filtration pressure gradually increased, reached a certain value, the need to replace the filter chamber. Replace the filter chamber, the operation of the valve before and after the filter chamber, filter chamber cut into the use of the reserve to plug the filter and remove the filter chamber cleaning.
