30 Computational formula The cause of the proper tension sieve net is broken by looseness of the net causing secondary vibrations that are different from the original vibration of the sieve machine, resulting in fatigue destruction of the baseline. Therefore, it is necessary to apply appropriate tension to the sieve net. The figure below is the result of a tensile test of wire mesh, and is generally called an S-S curve. The strain is applied to the horizontal axis, and the vertical axis is applied to the tensile load, such as unit width, and this is used as tension. The strain at the surrender point is usually around 1%. Kansai Wire Netting uses an appropriate tension of 0.25 to 0.5 times the surrender point. Therefore, it is appropriate tension to show 0.25 to 0.5% strain. The higher the opening rate, the less the clogging. ○The processing capacity is improved. ○Efficiency of sieves increases (beware of misalignment). ○The net is weak and the life span is shorter. ○It is easier for the eyes to go crazy. The biggest challenge in sifting is the clogging, which has a variety of symptoms as shown below. You need to consider measures according to each symptom. Increase the amplitude and frequency of vibration of the machine. Increase the opening rate, such as by narrowing the wire diameter. Manage the tension of the net and make the optimal tension. Take measures to prevent clogging, such as tapping balls and chain installation. Consider the toncap wire mesh and tierod wire mesh. The vibration of the machine is weak. The opening rate is low. The tension of the net is weak. We are not taking measures to prevent clogging. The shape of the mesh. A particle of a size close to the size of a mesh in a single mesh is clogged so as to push one by one. It has 3 to 4 contact points with the net wire, making it the most difficult to remove. A two-stage type is used to remove long items separately. It's caught in the net. It occurs when long things such as lint, piece of cloth, wire, etc. are contained. Reduce the supply. Change the vibration condition of the machine. Take measures to prevent clogging, such as tapping balls and chain installation. Take measures to eliminate electricity such as earth, corona discharge, and humidification. There is a lot of supply. We are not taking measures to prevent clogging. Due to static electricity. Particles smaller than the mesh in one mesh are gathered together and pressed together. Generally, it is easy to supply. Single clogging collective clogging adherence clogging clogging clogging 5 0.5% 1.0 10 15 strain (%) 20 25 tension (N/mm) opening rate 25% opening rate 40% opening rate 60% “Sifting Reader” See Shigeo Miwa 0.0 0 Reduce or remove moisture. Take measures to eliminate electricity such as earth, corona discharge, and humidification. Increase the amplitude and frequency of the machine. Consider a tonncap wire mesh with a rectangular mesh and a tie rod wire mesh. Consider fluoropolymer coating. Depends on the water. Due to static electricity. Others Particles are attached and packed. d A Ｇ： Estimated weight (kg/m) A: Eye opening (mm) ε: Opening rate (%) G = 12.7 × d A+d G = M × d 2 2 2 A+d A = 2 × 100 εd M 25.4 = A M: Mesh d: Line diameter (mm)
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