Filtration and paper fabrics

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 is interwoven with the surface weft yarns and the bottom weft yarns in the MD direction in the formof a single yarn or a pair of yarns; the surface weft yarns are interwoven with the surface warp yarns and the tridimensional compound yarns in the CMD direction, and the surface weft yarns pass through the surface warp and the tridimensional compound yarns in the following sequence: passing through the upper surface of two yarns, and then passing through the lower surface of two yarns so that thesurface weft yarns, the surface warp yarns and the tridimensional compound yarns are interwoven to form two continuous weft floating points and two continuous warp floating points which appear alternatively; in one basic loop organization, the forming surface interwoven part of the tridimensional compound yarns and the surface warp yarns form a first number of interwoven paths in the MD directionof the contacting bottom layer, the contacting bottom interwoven part of the tridimensional compound yarns and the bottom warp yarns form a second number of interwoven paths in the MD direction of the contacting bottom layer, and the first number and the second number are integral multiples of 4.

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 requires the warp and weft of the fabric to be small in diameter, which adversely affects the wear resistance of the contact substrate, and also reduces the machine direction of the fabric due to the fineness of the warp. strength

[0020] In order to solve the above problems and improve the performance of the fabric, a multi-layer fabric has been designed, so that the paper-forming surface layer of the fabric has a fine mesh and a thin thickness to facilitate the forming and drying of the paper, and increase the diameter of the contact bottom weft to improve the forming The abrasion resistance of the net, for example, has designed multi-layer fabrics, 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 forming surface and durable Machine side layer; it is usually called double layer fabric, also use 1 set of paper forming surface CMD direction yarns, 1 set of machine side CMD direction yarns and 2 sets of MD yarns, 1 set of stitching yarns to form a finer mesh It is commonly referred to as a three-ply fabric, 97182244.2, 97182245.X, 01804768.8, 02141980.9, 02800379.9, 200510076510.8, and US 5881764, 5967195, 6123116, 61452530, 679 Multi-layer fabrics, these fabrics provide a very fine mesh into the paper surface layer, but on the other hand produce a decrease in the water drainage performance of the fabric at a higher yarn density and an increase in production costs, and at a lower yarn density In the case of linear density, there is a lack of structural stability; or the contact bottom layer provides 2 times the contact bottom warp of the paper surface layer, resulting in the small contact bottom mesh and affecting the effect of water filtration

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