Needle-punched nonwovens have been used in roadbed reinforcement since 1960 and are currently one of the most widely used nonwoven geotextiles. The fiber is mixed, combed (or airflow) into a net, laid, drawn and needled to form a finished product. The entanglement strength formed by the needling is sufficient to meet the tensile stress during laying without tearing. And broken. It is characterized by large thickness, high density, fluffy structure, good water absorption and water permeability, strong resistance to deformation, and its permeability coefficient is comparable to that of sand filter material, but it is more convenient to lay out and the price is more affordable, so it is especially used as a filter material. Suitable. In addition, it also has certain enhancement and isolation functions, and can also be combined with other geosynthetic materials, with protection and other functions. Due to the characteristics of filtration and drainage of non-woven geotextiles, special attention should be paid to the hydraulic properties, including effective pore size and permeability coefficient.
To take advantage of the porous nature of the nonwoven fabric, the pore distribution is beneficial to retain fine particulate soil without clogging, which must be met in conjunction with the specific requirements of the project. Compared with the spunbond method, the acupuncture process is slightly longer, the production speed is limited by the needling speed, and the cost is slightly higher. The raw materials are mainly polyester staple fibers, followed by polypropylene and vinylon.
Short fiber needled geotextile processing technology has the following characteristics:
(1) The technology is easy to master: the production equipment is similar to the traditional spinning equipment, the adjustment process and equipment have a certain foundation, and the requirements put forward in the engineering, such as strength, vertical and horizontal strength ratio, hydraulic properties of bentonite waterproof blanket, etc. Easy to meet through process adjustments.
(2) It is adaptable and flexible. The same processing equipment can process different kinds of raw materials, such as polypropylene, polyester, nylon, and polyethylene fibers. It is very convenient to change the varieties, and it is easier to change the specifications of the fibers.
At present, China has a certain mechanical manufacturing base. The market has already supplied domestic wide-format equipment, which has good application effect and low price. (http://)
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