Glass fiber mat
Chopped strand mat
Cut the glass strands and sometimes twistless roving
into long pieces, lay them randomly but evenly on the mesh belt, and then apply emulsion adhesive The binder or powdered binder is heated and solidified and then bonded to form a chopped strand mat. Chopped strand mat is mainly used in hand lay-up continuous board making and molding and molding processes. The quality requirements for chopped strand felt are as follows: ① Uniform area quality along the width direction ② Chopped strands are evenly distributed on the felt surface, no large holes are formed, and the binder is evenly distributed ③ Moderate dry felt strength ④ Excellent The resin wetting and permeability.
The continuous strand mat lays the glass strands formed during the drawing process or the continuous strands extracted from the strand cylinder in a glyph shape on the continuous moving mesh belt
, and is bonded with a powder binder. Combined. The fibers in continuous fiberglass strand mat are continuous, so its reinforcement effect on composite materials is better than that of cut mat. Mainly used in pultrusion, R-pressure bag, glass mat reinforced thermoplastic and other processes.
Surface felt
FRP products
It is usually necessary to form a resin-rich layer, which is generally achieved with medium-alkali glass surface felt. Because this type of felt is made of medium-alkali glass, it gives FRP chemical resistance, especially acid resistance. At the same time, because the felt is thin and the diameter of the glass fiber is smaller, it can also absorb more resin to form a resin-rich layer, covering the glass fiber.
The texture of reinforced materials such as checkered cloth plays a role in surface modification.
Needle punched felt
Needle punched felt can be divided into chopped fiber needle punched felt and continuous strand needle punched felt. Chopped fiber needle felt is made by cutting glass fiber rovings into short pieces, randomly laying them on the base material pre-placed on the conveyor belt, and then needling them with barbed needles. The chopped fibers penetrate into the substrate, and the crochet hook pulls some of the fibers upward to create a three-dimensional structure. The substrate used can be a thin fabric of glass fiber or other fibers. This needle-punched felt has a fluffy feel. Its main uses include being used as thermal insulation and sound insulation materials, thermal lining materials and filter materials. It can also be used in the production of fiberglass reinforced plastics. However, the strength of the fiberglass reinforced plastics produced is low and the scope of use is limited. Another type of continuous strand needle-punched felt is a mat in which continuous glass strands are randomly thrown on a continuous mesh belt using a throwing device and needled through a needle plate to form a three-dimensional structure in which the fibers are interconnected. This mat is mainly used in the production of glass fiber reinforced thermoplastic punchable sheets.
Sewing mat chopped glass fiber
It can be sewn into chopped fiber or long fiber mat using a stitching machine
from long to long lengths. The former can replace traditional adhesives in several uses. Bonded chopped strand mat, the latter replaces continuous strand mat to a certain extent. Their common advantages are that they do not contain binders, which avoids pollution during the production process, and at the same time they have good soaking performance and low prices.
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Fiberglass felt cloth