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Author:Site Editor Publish Time: 2020-12-14 Origin:Site
We use a loom to spin glass fiber yarns of different thicknesses into glass fiber cloths with different patterns and thicknesses. Glass fiber yarn is made of glass balls, melted at high temperature, and then drawn into threads, and then chemical raw materials are used to combine very thin threads to become suitable for spinning.
Mainly silane coupling agent and starch coupling agent. At present, the use of silane coupling agents in glass fibers is quite common. The silane coupling agents used in this area account for about 50% of the total consumption. Among them, the more used varieties are vinylsilane, aminosilane, Methacryloxysilane, etc.
The glass fiber itself can be made into woven cloth, commonly known as glass fiber cloth. It can be coated with various chemical compounds, such as rubber and resin coatings. The purpose is to enhance and broaden the function of glass fiber so that it can be used in more industries.
The biggest feature of glass fiber is fireproof and flame retardant. There will be no burning when exposed to an open flame, and it feels slightly harder than ordinary textile fabrics. The folding endurance will be relatively poor, and the fiber will be broken if it is repeatedly folded by hand. The natural color of glass fiber is pure white, so the fabrics made are all white unless they are specially treated.
The characteristics of the fabric are determined by fiber function, warp and weft density, yarn structure and weave. The warp and weft density is determined by the yarn structure and texture. The density of warp and weft plus the yarn structure determines the physical properties of the fabric, such as weight, thickness and breaking strength.
Unidirectional fabric The unidirectional fabric is a four-warp broken satin or long-axis satin fabric woven from thick warp yarns and fine weft yarns. It is characterized by high strength in the main direction of the warp at 0 degrees. There are also glass fiber single weft fabrics. There are two weaving methods of warp knitting and weaving. It is characterized by thick weft yarns, fine warp yarns, and glass fiber yarns that are fed in the weft direction and have high strength in the 90° weft direction.
Glass fiber checkered cloth is a non-twisted roving plain weave fabric, which is an important substrate for hand-laid glass fiber reinforced plastic. Warp cloth, single weft cloth.
Untwisted roving is made up of parallel monofilaments or parallel strands. The diameter of the glass fiber used in the production of glass roving ranges from 12 to 23 μm. Untwisted roving can be directly used in some composite material forming methods, such as entangling and pultrusion. Because of its average tension, it can also be woven into the untwisted roving fabric. In some applications, the untwisted roving will be further shortened. cut. The quality requirements of the other side plaid are as follows:
①The fabric is average, the edge of the cloth is straight, and the cloth surface is flat and mat-like, without stains, fluffing, creases, wrinkles, etc.;
②The warp and weft density, area weight, cloth width and roll length are all in line with the standard;
③Wound on a firm paper core, neatly winding;
④Rapid and good resin permeability;
⑤The dry and wet mechanical strength of the laminated material made of fabric should meet the requirements. The composite material formed by laying gingham cloth is characterized by low interlayer shear strength, poor pressure resistance and fatigue strength.
Chopped strand mat cuts the glass strands (or sometimes untwisted roving) into 50mm lengths, spreads them randomly but evenly on the mesh belt, and then applies emulsion binder or sprinkle powder binder to heat and solidify Bonded into chopped strand mat.
The continuous raw silk felt is formed by spreading the glass raw filaments formed during the drawing process or the continuous raw filaments retired from the raw filament cylinder in a figure of eight on a continuous moving mesh belt, and is formed by bonding with a powder adhesive. The fiber in the continuous glass fiber mat is continuous, so its reinforcement effect on composite materials is better than that of chopped strand mat.
Needle felt is divided into chopped fiber needle felt and continuous strand needle felt. Chopped fiber needle felt is to chop the glass fiber roving into 50mm, and randomly place it on the substrate placed on the conveyor belt in advance, and then use a barbed needle for needle punching. The needle pierces the chopped fiber into the substrate In the middle, and the crochet hook brings up some fibers to form a three-dimensional structure. The substrate used can be a thin fabric of glass fiber or other fibers. This needled felt has a fluffy feel. Another type of continuous strand needle felt is a felt in which continuous glass strands are randomly thrown onto a continuous mesh belt with a filament throwing device, and then needled through a needle plate to form a three-dimensional structure in which fibers are interconnected.
The former can replace traditional binder-bonded chopped mats in several applications, and the latter To a certain extent, it replaces continuous strand mat. Their common advantage is that they do not contain binders, which avoids pollution during the production process, and at the same time have good soaking performance and low prices.
Divided into woven sidebands (plain sidebands) and unwoven sidebands (frayed sidebands), the main weaving method is plain weave. E-glass fiber tape is often used to manufacture high-strength, electrical equipment parts with good dielectric properties.
Three-dimensional fabrics are relatively flat fabrics, and their structural characteristics have evolved from one-dimensional and two-dimensional to three-dimensional, so that the composite material with this reinforcement has good integrity and profiling, which greatly improves the interlayer shear of composite materials. Shear strength and damage tolerance. It was developed in response to the special needs of aerospace, aviation, swordsmanship, ships and other parts. At present, its application has been extended to automobiles, sports equipment, medical equipment and other parts. There are five main categories: woven three-dimensional fabrics, knitted three-dimensional fabrics, orthogonal and non-orthogonal non-woven three-dimensional fabrics, three-dimensional woven fabrics and other forms of three-dimensional fabrics.
The shape of the special-shaped fabric is very similar to the shape of the product to be reinforced, and it must be woven on a special loom. Special-shaped fabrics with symmetrical shapes include: round caps, cones, caps, dumbbell-shaped fabrics, etc., and can also be made into boxes, hulls, and other different shapes.
The slot core fabric is a fabric composed of two parallel layers of fabric connected by vertical strips. Its cross-sectional shape can be triangular, rectangular, or honeycomb structure.
Also known as knitted felt or woven felt, it is different from ordinary fabrics and felt in the usual sense. The most typical stitch knitted fabric is a layer of warp yarn and a layer of weft yarn overlapped together, the warp yarn and weft yarn are knitted together to form a fabric through the stitching. The advantages of stitched fabrics are as follows:
It can increase the ultimate tensile strength, delamination strength under tension and bending strength of FRP laminated products;
Reduce the weight of FRP products;
The surface is smooth to make the surface of FRP smooth;
Simplify hand layup operation and improve labor productivity. This kind of reinforcing material can replace continuous raw silk felt in pultrusion glass fiber reinforced plastic and RTM, and can also replace checkered cloth in the production of centrifugal glass fiber reinforced plastic.