Needle-punched Geotextile Processing Technology Has the Following Characteristics
Currently, this product is one of the most widely used nonwovens. The specific production process is as follows: short fiber→mixing→opening→carding→netting→pre-needling→heat setting→winding→geotextile fiber opening and mixing, carding (or airlaid), laying, stretching, needle The thorns are consolidated into a finished product. The entanglement formed by needle punching is strong enough to meet the tensile stress during the laying process without causing tearing and bursting. Its characteristics are large thickness, high density, fluffy structure, good water absorption and permeability, and strong resistance to deformation. Its permeability coefficient is equivalent to that of sand filter material, but it is more convenient and economical to lay, so it is especially suitable for filter material.
In addition, it also has certain reinforcement and isolation functions can also be composited with other geosynthetics and have multiple functions such as protection. As the high quality filament nonwoven geotextile has the characteristics of filtration and drainage, special attention should be paid to its hydraulic characteristics, including effective pore size and permeability coefficient. In order to take advantage of the porosity of the nonwoven fabric, the pore distribution is beneficial to keep the soil fine particles without clogging, which must be met in conjunction with the specific requirements of the project. Compared with the spunbond method, the process flow of the needle punching method is longer, the production speed is limited by the needle punching speed, and the cost is higher. Polyester staple fiber is the main raw material, followed by polypropylene and vinyl on.
The processing technology of short fiber needle punched geotextile has the following characteristics:
(1) Strong adaptability and flexibility: The same processing equipment can process different raw material varieties, such as polypropylene fiber, polyester fiber, nylon fiber, polyethylene fiber, etc., so it is very convenient to change varieties and it is relatively easy to change fiber specifications.
(2) The process is easy to master: the production equipment is similar to the traditional spinning equipment, and there is a certain basis for the adjustment of the process and equipment. Through process adjustment, engineering requirements such as strength, vertical and horizontal strength ratio and various hydraulic characteristics can be easily met. At present, my country has a certain basis for machinery manufacturing, and domestic wide-width equipment has been supplied on the market, with good application effects and low prices.