How to identify a good dust filter bag?
Identification of the bag dust bag first need to understand several key technical indicators, the main ones, density, thickness, weight, air permeability, breaking strength, etc. These are important identification data for filter cloth.
1, see. From the color of the bag in terms of large chemical fiber cloth is in white with good gloss. Small chemical fiber cloth bag is dim, gray. There are also needle filter felts such as NOMEX filter felt, the color is yellow. Besides also see gloss of dust filtre bags: for filament filter cloth, the surface is smooth, glossy is good, while the surface of staple fiber cloth is usually hairy; and see cloth lines: twill, plain weave, these lines can also be used as a basis to judge models. Different lines, specifications will be different.
2, touch. Touch softness: staple fiber cloth bag like 208,729, these filter cloth feels like plush fabrics, is very soft. 734,747,758,3927 are woven by the same kind of material, but with different thicknesses, densities only. 3927 is very rough, strong, not soft. Softness and roughness need you grab the sample filter cloth, touch and feel, and write it down. It is hard to talk it to clear. Touch Density: Density can be figured out by touch, and it’s best to count how many wires within 10cm. Each filter cloth has its own density coefficient, you just need to discern roughly.
3. Measure Mainly is to measure the thickness of the bag , preferably take a small piece of cloth and weigh ( grams per square meter ).
4. Burning. Wherein the polyester needle felt burning black smoke , polypropylene needle felt burning up fat glaucoma. For other needle filters, it is hard to identify.Normally, first is to determine whether it is woven fabric, and then determines the material ( polyester, polypropylene or what else), then then determin it is staple or filament, and check the lines.. Then check thickness of the cloth , density , weight Technical indicators comprehensive determination of cloth model , it is best to have a corresponding model specification sheet