Types and uses of fiberglass chopped strand mat

1. Needle felt

Needle felt is divided into chopped fiber needle felt and continuous strand needle felt. Chopped fiber needled felt is to chop the glass fiber roving into 50mm, randomly lay it on the substrate placed on the conveyor belt in advance, and then use a barbed needle for needle punching, and the needle will pierce the chopped fiber into the substrate 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, and this needled felt has a fluffy feel. Its main uses include heat insulation and sound insulation materials, heat lining materials, filter materials, and can also be used in the production of FRP, but the strength of the FRP is low and the scope of use is limited. 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 wire throwing device, and then needled through a needle plate to form a three-dimensional structure in which fibers are intertwined. This kind of felt is mainly used in the production of glass fiber reinforced thermoplastic stampable sheets.

2. Fiberglass Chopped Strand Mat - Powder binder
The glass raw filaments formed during the drawing process or the continuous raw filaments retired from the raw filament tube are laid on a continuous moving mesh belt in a figure of 8 and are bonded by a powder adhesive. The fiber in the continuous glass fiber mat is continuous, so it has a better reinforcement effect on the composite material.

3. Fiberglass Chopped strand mat – Emulsion binder
Cut the glass fiber (sometimes also use untwisted roving) into 50mm length, spread it randomly but evenly on the mesh belt, and then apply emulsion adhesive or sprinkle powder binding agent to heat and solidify and bond it into short Cut raw silk felt. Chopped strand mats are mainly used in hand lay-up, continuous board making and compression molding and SMC processes. The quality requirements for chopped strand mats are as follows: ①The area quality is uniform along the width direction; ②The chopped strands are evenly distributed in the mat surface without large holes, and the binder is evenly distributed; ③Has moderate dry mat strength; ④Excellent The resin infiltration and permeability.

4. Suture mat

Chopped glass fibers from 50mm to 60cm in length can be stitched into chopped fibers or long fiber mats with a stitchbonding machine. The former can replace traditional binder-bonded chopped mats in several applications, while the latter can be used in certain applications. To a certain extent, it replaces the continuous strand felt. Their common advantage is that they do not contain adhesives, avoiding the pollution of the production process, and at the same time have good permeability and low price.

5. Surface felt

FRP products usually need to form a resin-rich layer, which is generally achieved by using medium-alkali glass surface mats. Because this kind of felt is made of medium-alkali glass c, 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 small, it can also absorb more resin to form a resin-rich layer, which hides it. The texture of glass fiber reinforced material (such as checkered cloth) plays a role in surface modification. (For some FRP products with high surface requirements, polyester surface felt is basically used now)

Post time: Aug-12-2021

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