In modern life, glass can be seen everywhere. But have you ever heard of fiberglass cloth? Perhaps some people have heard of it and have also known it. But they are not very familiar with it. Next, let me take you to understand what fiberglass cloth is and what fiberglass cloth is like. For reference only!

Glass fiber checkered fabric is a plain weave fabric made of untwisted roving, and is an important substrate for hand laid fiberglass. The strength of checkered fabric mainly lies in the warp and weft directions of the fabric. For situations where high warp or weft strength is required, it can also be woven into unidirectional fabric. It can arrange more untwisted roving, single warp fabric, and single weft fabric in the warp or weft directions. Twistless roving is made by bundling parallel strands or parallel monofilaments. Twistless roving can be divided into E-GLASS alkali free glass untwisted roving and C-GLASS alkali free glass untwisted roving based on glass composition.

Glass fiber untwisted roving fabric

The diameter of glass fibers used in the production of glass roving ranges from 12 to 23 μ M. The count of untwisted roving ranges from 150 to 9600 (tex). Untwisted roving can be directly used in certain composite material forming methods, such as winding and pultrusion processes. Due to its uniform tension, it can also be woven into untwisted roving fabrics, and in some applications, untwisted roving can be further shortened.

The quality requirements for the fabric are as follows: ① The fabric is uniform, the edges are straight, the fabric surface is flat and in a mat shape, without stains, fuzzing, creases, wrinkles, etc.; ② The density of warp and weft, area weight, fabric width, and roll length all meet the standards; ③ Wrap it neatly on a sturdy paper core; ④ Rapid and good resin permeability; ⑤ The dry and wet mechanical strength of laminated materials made of fabrics should meet the requirements.

The characteristics of the composite material formed by laying checkerboard are low interlaminar Shear strength and poor compressive and fatigue strength.

Glass fiber felt cloth

(1) The chopped strand mat cuts the glass strand (sometimes with untwisted roving) into 50 mm long, spreads it on the mesh belt randomly but evenly, and then applies lotion binder or spreads powder binder, after heating and curing, it is bonded into chopped strand mat. Short cut felt is mainly used in hand layup, continuous board making, mold pressing, and SMC processes. The quality requirements for chopped strand felt are as follows: ① uniform area quality along the width direction; ② The chopped strand is evenly distributed in the felt surface, without the formation of large pores, and the binder is evenly distributed; ③ Having moderate dry felt strength; ④ Excellent resin infiltration and permeability.

(2) The continuous strand felt is formed by laying the glass strand formed during the drawing process or the continuous strand that is detached from the strand cylinder in an 8-shaped shape on a continuous moving mesh belt, and is bonded with a powder binder. The fibers in continuous fiberglass felt are continuous, so its reinforcement effect on composite materials is better than that of short cut felt. Mainly used in processes such as pultrusion, RTM, pressure bag, and glass felt reinforced thermoplastic (GMT).

(3) Surface felt fiberglass products usually require the formation of a resin rich layer, which is usually achieved using medium alkali glass surface felt. This type of felt is made of medium alkali glass (C), which endows fiberglass with chemical resistance, especially acid resistance. At the same time, due to the thin felt and small diameter of fiberglass, it can absorb more resin to form a rich resin layer, covering the lines of glass fiber reinforced materials (such as checkered cloth), and playing a surface modification role.

(4) Needle felt needle felt can be divided into short cut fiber needle felt and continuous filament needle felt. Short cut fiber needle felt is a method of cutting glass fiber roving into 50mm short pieces and randomly laying it on a substrate pre placed on a conveyor belt. Then, a needle with a barb is used to needle the short cut fibers into the substrate, and the hook needle lifts some fibers upwards to form a three-dimensional structure. The substrate used can be a thin fabric of glass fiber or other fibers, and this type of needle felt has a fluffy feel. Its main uses include as insulation and sound insulation materials, heat lining materials, filter materials, and can also be used in the production of fiberglass, but the produced fiberglass has low strength and limited scope of use. Another type of continuous strand needle felt is a felt that randomly throws continuous glass strands onto a continuous mesh belt using a wire throwing device, and forms a three-dimensional structure of fibers interconnected through needle plates. This type of felt is mainly used for the production of glass fiber reinforced thermoplastic stamping sheets.

(5) Short cut glass fibers can be sewn into short cut fibers or long fiber mats using a sewing machine, ranging from 50mm to 60cm in length. The former can replace traditional adhesive bonded short cut mats in several applications, while the latter can to some extent replace continuous strand mats. Their common advantage is that they do not contain binders, avoid pollution during the production process, and have good permeability and lower prices.