Method and apparatus for filtering a polymeric melt
AssigneeBarmag AG
InventorsKnut Hobrecht, Friedhelm Itter
Life of this patent
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Abstract
A filtering method and apparatus for continuously filtering a polymeric melt, which includes a plurality of filter chambers which are arranged in a melt flow path parallel to one another. Also, an intermediate filter is arranged parallel to the filter chambers. When one of the filter chambers is disconnected for the purpose of cleaning or replacing the filter element therein, the intermediate filter is connected synchronously in the melt flow path and, after the filter chamber is cleaned, or the filter element is exchanged, the flow is switched back through the filter chamber, and the intermediate filter is again disconnected.
Claims14
A method of continuously filtering a polymeric melt comprising the steps of
- providing a filter chamber which includes a melt inlet and a melt outlet, with at least one filter element disposed in said filter chamber, and with said filter element having an open end communicating with said melt outlet, and a closed end,
- conveying the melt through the melt inlet such that the melt passes through said one filter element and then exits through said open end of said filter element and then through said melt outlet of said filter chamber, and
- wherein the step of conveying the melt through the melt inlet includes dividing the conveyed melt so that a first portion of the melt flow passes in a radial direction through a first opening adjacent said open end of said one filter element and a second portion of the melt flow passes in an axial direction through a second opening adjacent said closed end of said one filter element.
An apparatus for filtering a continuous flow of a polymeric melt, and comprising
- a filter chamber which includes a melt inlet and a melt outlet,
- at least one filter element disposed in said filter chamber, with said filter element having an open end communicating with said melt outlet, and a closed end, such that the melt entering the filter chamber through said melt inlet passes through said one filter element and then exits through said open end and said melt outlet,
- said melt inlet including a tube disposed within said chamber and positioned generally parallel to and adjacent said one filter element, with said tube including a plurality of radial bores adjacent said open end of said one filter element and an open free end adjacent said closed end of said one filter element.
Dependencies are inferred from the claim text.