Mott Melt Polymer Spin Pack Filters
Mott Melt Polymer Spin Pack Filters
The typical setup for synthetic fiber melt spinning includes a polymer melter, extruder, prefilter, central manifold, metering pumps, and spin packs. Prefilters remove large particles, but additional filtration in spin packs is necessary to protect the spinnerette and ensure fiber quality.
Traditional filtration used sand and screen packs, which are inexpensive but have issues like channeling and pressure drops. Mott Corporation introduced sintered powdered metal filter discs in the 1960s, eliminating channeling and providing more reliable filtration.
Mott developed the Extended Area Pack (EAP) filter, which uses porous filter cups for improved filtration, especially for Nylon 6 fibers. These packs extend pack life and eliminate channeling.
The production process involves a melter, extruder, prefilter, manifold, metering pumps, and spin packs.
Mott developed 10 polymer grades ranging from 10 to 100 microns to meet diverse filtration needs. These grades ensure precise filtration control.
For gel-prone polymers, shattered metal is used with Mott EAPs to improve filter performance and pack life.
Pack life varies based on factors like pigment loading and polymer quality. Mott EAP filters can be cleaned and reused, making them cost-effective.
Cleaning involves removing solidified polymer using fluid bed cleaners or oven burn-out, followed by caustic flushing, water rinsing, ultrasonic cleaning, and possibly acid soaking.
Mott offers precise porosity control with straight, threaded, and slotted filter cups, suitable for high-pressure operations up to 5000 psi.
Mott EAPs have replaced sand and screen packs, offering increased filtration area and eliminating channeling. They are constructed with closely packed porous cups for mechanical integrity.
EAPs reduce start-up pressure and shear due to increased filter area, ensuring continuous fiber quality. Shear compensating discs are used to maintain proper pressure and shear.
EAPs are mounted on a breaker plate with lateral flow screens and shear compensating discs to ensure uniform polymer flow. Various configurations are available to suit different needs.
Catalog excerpts
Mott Melt Polymer Spin Pack Filters Engineering and Product Guide >
Open the catalog to page 1
During the development of the shear disc insertsand the extended area packs, Mott originally pro- duced porous material in media grades of 10, 20, 40 and 100. It was discovered that these incre-ments were too broad to meet the filtration and shear requirements of the range of polymers pro- duced. In response Mott developed 10 polymer grades from 10 to 100 micron. Following are nominal filtration equivalents of the grades.PG110 micronPG212 micron PG315 micron PG420 micron PG530 micron PG640 micron PG755 micron PG860 micron PG980 micron PG10100 micron > The first step in cleaning EAPs is to remove...
Open the catalog to page 3
Extended Area for Longer Pack Life > Mott Extended Area Pack filters have been used inthe field since 1966. Mott EAPs have replaced sand packs (see bottom illustration) and screen packs, with area multiplications from 3 to 10 times. Mott high-precision porous 316L stainless steel filter cups ensure continuous filtration performance (without channeling which occurs in sand packs), and eliminate the fragile nature of screen packs under pressure. CIRCULAR PACKKIDNEY PACK RECTANGULAR PACKOBROUND PACK Construction > Mott porous cups are closely packed in a base plate. The cups are press-fitted or...
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