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How to select high quality extruder screen

  • Categories:NEWS
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  • Time of issue:2021-11-11 21:34
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(Summary description)How to select high quality extruder screen?Steel wire is the most commonly used metal filter material in extruder. Nickel alloy filter screen is used to avoid corrosion by fluoropolymer or PVDC. Generally, the mesh size of the qulity extruder screen (or the number of wires per inch) is 20 ~ 150 or more. The filter screen with 20 mesh is relatively coarse; The qulity extruder screen with 40 ~ 60 mesh is relatively fine; The extruder screen with 80 ~ 150 mesh is very fine. The mesh of most filter screens are square woven, and the number of wires in each direction is the same.

How to select high quality extruder screen

(Summary description)How to select high quality extruder screen?Steel wire is the most commonly used metal filter material in extruder. Nickel alloy filter screen is used to avoid corrosion by fluoropolymer or PVDC. Generally, the mesh size of the qulity extruder screen (or the number of wires per inch) is 20 ~ 150 or more. The filter screen with 20 mesh is relatively coarse; The qulity extruder screen with 40 ~ 60 mesh is relatively fine; The extruder screen with 80 ~ 150 mesh is very fine. The mesh of most filter screens are square woven, and the number of wires in each direction is the same.

  • Categories:NEWS
  • Author:
  • Origin:
  • Time of issue:2021-11-11 21:34
  • Views:
Information

How to select high quality extruder screen?Steel wire is the most commonly used metal filter material in extruder. Nickel alloy filter screen is used to avoid corrosion by fluoropolymer or PVDC. Generally, the mesh size of the qulity extruder screen (or the number of wires per inch) is 20 ~ 150 or more. The filter screen with 20 mesh is relatively coarse; The qulity extruder screen with 40 ~ 60 mesh is relatively fine; The extruder screen with 80 ~ 150 mesh is very fine. The mesh of most filter screens are square woven, and the number of wires in each direction is the same.

The aperture of the qulity extruder screen with the same number of screens is determined according to the diameter of the metal wire, and it is not necessary to be completely consistent. For example, for a 20 mesh filter screen made of metal wire with a row spacing of 24 inches and a diameter of 0.02 inches, the opening on each side is 0.01 inches; For the 20 mesh filter screen made of metal wire with a row spacing of 30 inches and a diameter of 0.01 inches, the opening on each side is slightly larger, which is 0.04 inches. This is because the filtration of fine wire is not fine enough and it is easier to block (1in = 25.4mm).

Generally, the installation mode of the filter device is: the coarsest extruder screen faces the protective plate, while the thinnest extruder screen faces the extruder. For example, the arrangement of the extruder screen from the protective plate to the extruder may be 20 mesh / 40 mesh / 60 mesh, because this arrangement can prevent the filter screen from being blocked and "blow" impurities into the opening of the protective plate.

If the smallest extruder screen is 80 or more meshes, in order to prevent the screen from being blocked by the rotating movement of molten material or large impurities, a rough screen can be placed in front (such as the arrangement of 20 / 100 / 60 / 20 meshes). Because this type of device is the same from both sides, in order to ensure that they will not be reversed, a symmetrical arrangement (20 screen / 60 screen / 100 screen / 60 screen / 20 screen) is sometimes adopted. Some processors deliberately put the filter screen upside down and let the coarse filter screen filter the large particle impurities on the upstream surface first. They believe that this method can allow more side molten materials to pass through and reduce the decomposition of materials on the upstream surface of the protective plate.

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