How to judge the quality of stainless steel screen
Qualified：
1.Stainless steel wire diameter and deviation, material material inspection. The surface of the stainless steel wire shall be smooth and bright, and shall not have longitudinal flaws, burrs, rust and other defects; the wire diameter tolerance shall comply with the requirements, and the material shall meet the requirements.
2.Inspection of weaving accuracy. Divided into 3 levels: first-class accuracy, mesh limit deviation can not exceed 6%; second-level accuracy does not exceed 9%; third-level accuracy does not exceed 12%; mainly is the inspection of the arithmetic mean of the mesh and the size of the large mesh test.
3.Inspection of the quality of the weaving. Metal mesh is unlikely to have no manufacturing defects in the production process. Under normal circumstances, metal mesh delivered in rolls is not allowed to have major defects, allowing a small number of important defects to exist, allowing a certain number of general defects to exist.
The following conditions of the stainless steel screen on the weaving process are major defects:
1. The warp and weft are not firmly intertwined, and the two fingers are used to move up and down, and the warp and weft yarns have obvious loose displacement phenomenon;
2. the winding is serious, the mesh is greater than or equal to 0.18mm, the natural crimp diameter of the 1m long mesh surface is less than 80mm; the mesh is less than 0.18mm, and the natural bending diameter of the 1m long mesh surface is less than 60mm, which should be judged as unqualified;
3. the net slope is serious, the width of the web width of the warp and weft is not more than 4 degrees;
4. a large area of multiple creases;
5. The extra large mesh in the radial direction exceeds the tolerance;
6. large area density is poor;
7. large area run latitude, the mesh surface is uneven;
8. The warp and weft diameters are seriously out of tolerance;
9. broken holes, half latitude, large forks;
10. The serious color difference of large area is uneven and the mechanical damage is serious.
Stainless steel screen important defects terminology detailed explanation: forks, holes (more than 3 broken menstruation); 2) half cut weft (length greater than 50mm; 3) mesh surface is not flat; 4) thin dense road; 5) partial wrinkles, folds Traces, corrugations; 6) lightly wound; 7) lightly inclined; 8) larger jumpers (length greater than 10mm) 9) larger loose, double, and parallel (length greater than 30mm), ruffled or Wavy side.
General defects are: such as single broken wire, nest weft, nose, small loose wire, small jumper, wrong twist, slight unevenness of the mesh surface, slight curling, spotting oil, small debris, light wavy edge, etc. . The number of general defects cannot be more than 5 square meters.
The fourth point: the inspection of the network width and network length. The standard mesh length of the wire woven mesh is 30.5 meters, only the positive tolerance is +0.5m, and the negative tolerance is not allowed. Each roll can be composed of 1 segment or up to 3 segments, and the minimum length of the smallest segment should be no less than 2 meters. The width of the mesh is less than 2 meters, only the positive tolerance is +20mm, and the negative tolerance is not allowed.
The fifth point: the inspection of dense mesh. Different from the square hole net, the inspection of the mesh size and the weft density between the filaments was measured using a steel ruler with a graduation value of 1 mm or a reading microscope with a graduation value of 0.05 mm and a magnification of 25 times. At least 3 points shall be measured, and the connection between the places shall not be parallel with the warp and weft lines. The measuring point shall not be less than 20mm from the edge of the net; the allowable number of large meshes between the warp threads shall not exceed 3% of the total number of warp threads. The specifications of the dense mesh, the deviation of the mesh size between the warp threads, and the density of the weft should conform to the national standard. The dense mesh should be flat and clean, the weft should be closely arranged, there is no gap, no bright road; there should be no mechanical damage, creases, rust spots, etc.
PREVIOUS： 10 mesh stainless steel mesh introduction
