Fabric for filtering and paper-making

Abstract

The invention discloses a fabric for filtering and paper-making, which comprises a yarn system forming a forming surface layer, a yarn system forming a contacting bottom layer, and a tridimensional compound yarn system, wherein the yarn system of the forming surface layer comprises a set of surface warp yarns and a set of surface weft yarns; the yarn system of the contacting bottom layer comprisesa set of bottom warp yarns and a set of bottom weft yarns; the tridimensional compound yarn system comprises first tridimensional compound yarns and second tridimensional compound yarns which are interwoven with the surface weft yarns and the bottom weft yarns in the MD direction, and the surface layer interwoven part of the tridimensional compound yarns passes through the upper sides of at leasttwo surface weft yarns; the contacting bottom layer interwoven part of the tridimensional compound yarns passes through the lower side of at least one bottom weft yarn, the first tridimensional compound yarns pass through the upper side of a first number of surface weft yarns, the second tridimensional compound yarns pass through the upper side of a second number of surface weft yarns, and the second number is at least one more than the first number; the forming surface layer of the surface warp yarns and the tridimensional compound yarns is interwoven with the surface weft yarns in a tabby mode; each first tridimensional compound yarn and each second first tridimensional compound yarn are respectively located on the left side and the right side of each surface warp yarn and form an interwoven path with the surface warp yarn in the MD direction; the forming surface layer interwoven part of each first tridimensional compound yarn and part of the surface warp yarn form one interwoven path, and the forming surface layer interwoven part of the second tridimensional compound yarn and the rest part of the surface warp yarn form the other interwoven path.

Description

field of invention [0001] This invention relates to filter and papermaking fabrics, known as forming fabrics in the papermaking industry. Background technique [0002] In the paper industry, pulp is turned into paper through a series of equipment and processes, among which the fourdrinier paper machine is the main equipment of the paper industry. The pulp box is sprayed onto the surface of the forming wire. The forming wire is an endless mesh belt woven from polymer materials. The rollers run circularly at a certain speed. Various dewatering devices on the screen table are located on the lower side of the forming wire contacting the bottom layer, such as water suction boxes and wipers. During the operation, the moisture and other liquids in the pulp are filtered, and the raw material fibers in the pulp are separated from the water medium to form a wet paper web on the forming surface layer of the forming wire, and enter the press area through the transfer device after the v...

AI Technical Summary

Problems solved by technology

The fine mesh and thin thickness of the fabric usually require the warp and weft of the fabric to be small in diameter, which has a negative impact on the wear resistance of the contact layer, and at the same time, the fineness of the warp also reduces the strength of the fabric in the MD direction

[0017] In order to solve the above problems and improve the performance of the fabric, multi-layer fabrics have been designed, so that the paper-forming surface layer of the fabric has fine mesh and thin thickness to facilitate the forming and drying of the paper, and increase the diameter of the contact bottom weft to improve forming The wear resistance of the net, for example, has designed a multi-layer fabric, using 2 sets of paper forming surface CMD direction yarns, 2 sets of machine side yarns and 1 set of MD yarns to form a finer mesh surface layer and durable It is usually called a double-layer fabric, and it also uses 1 set of paper forming surface CMD direction yarns, 1 set of machine side yarns and 2 sets of MD yarns, and 1 set of stitching yarns to form a finer mesh 成形面层和耐用的机器侧面层;其通常被称为三层织物,97182244.2、97182245.X、01804768.8、02141980.9、02800379.9、200510076510.8、200710100644.8和美国5881764、5967195、6123116、6145550、6745797、7243687、2004082465、 200701577987 discloses multi-layer fabrics, these fabrics provide very small mesh holes into the paper surface layer, but from another aspect, the reduction of water drainage performance and the increase of production cost of the fabric under the situation of higher yarn density are produced. In the case of lower yarn density, there is a lack of structural stability; or the paper-forming surface layer provides less structural stability than the CMD direction that contacts the underlying warp and affects the surface layer

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