What is plastic woven fabric? Plastic woven fabric is made of polyethylene (PE) and polypropylene (PP) as raw materials. It consists of two sets of parallel flat yarns. One set is called warp yarns along the longitudinal direction of the loom (the direction of the fabric). , Another group of horizontal arrangements is called weft. Different weaving equipment and processes are used to weave the warp and weft yarns into a cloth shape, which can be woven into different thicknesses and densities according to different ranges of use. The market is generally called tarpaulins, tarpaulins, South Korean cloths, and colored strips.
Plastic woven cloth manufacturers tell you what is plastic woven fabric
The traditional agricultural greenhouse cover is usually a plastic film such as a polyvinyl chloride (PVC) greenhouse film, a polyethylene (PE) greenhouse film, or a plastic sheet. The specific gravity of PVC shed film is relatively large, it is easy to harden and catalyze at low temperature, and easy to soften and relax at high temperature. The service life of this plastic film is very short, usually 4-6 months; Additives such as anti-aging agents are usually added, but even if anti-aging agents are added, the effective use period is only 8-10 months; and due to the generation of chlorine gas, the residual film cannot be burned and it is easy to cause soil and environmental pollution. PE shed film must be added with additives such as anti-aging agent, no drops, and heat preservation agent during the preparation process, otherwise it cannot form a film, and the plastic film has poor weather resistance and heat insulation and is not easy to adhere.
The root cause of unevenness in the woven fabric of plastic woven bags
For a woven fabric to be flat, warp and weft tension must be balanced. This sentence is easy to say, it is really difficult to do it, and no one or any equipment can achieve the absolute balance of warp and weft tension. Therefore, it can only be said that the flatter the woven fabric, the more balanced the warp and weft tension. Of course, some people require that the weaving cloth be flat, and the warp and weft gaps should be equal, and there should be no folded or twisted flat yarn. Then we will talk about how to adjust the tension balance of the warp and weft of the woven bag. The following methods are only preliminary adjustment methods and methods. More detailed methods and methods will be discussed in each specific fabric defect in the following.
1. Adjustment of warp tension The adjustment of warp tension is mainly the guide wire holes, let-off rollers and jump bars that the warp and flat yarn pass through. The warp creel is the birthplace of the uneven tension of the warp yarns, and we must not ignore this. In particular, the rotation resistance moment of the tray shaft of each spindle of the warp frame directly affects the origin of warp tension. In addition, pay attention to whether there is a flat wire wound on the shaft to increase the rotational resistance torque, and whether there is a hemming wire that makes the rotational resistance torque unbalanced. The resistance of the flat wire passing through the guide wire holes should be equal. This requires that the angle and length of each flat wire passing through all the guide wire holes should be balanced as much as possible. Cross warp is not allowed. Jumper adjustment is the most important. First, each jumper must be flexibly rotated, and can not be stuck by dust and oil. Several or a dozen of them can be rotated together. If necessary, it is recommended to isolate each jumper with a spacer ring in order to increase Mobility. The spring of the jumper must be effective and the tension is appropriate. It is recommended to clean, check and install the jumper and the spring of the jumper again. Correctly determine the tension of each warp thread, and then adjust the tension of the jumper pull spring at any time to obtain the appropriate tension of each flat wire.
2. Adjustment of the tension of the weft thread The tension of the weft thread is greatly affected by the size of the shaft wire, and the tension adjustment of the weft thread is mainly to adjust the tension of the tension brush tension spring, which is indeed difficult to adjust to balance. It is suggested to improve this adjustment method, such as increasing the frictional force on the end face.