How to use the fiberglass?

Glass fiber spray coating equipment operation

The glass fiber spray layup process is similar to the manual layup process, but the application of fiber and resin on the mold is different. Spraying is a manufacturing process of open-molded composite materials in which resin and reinforcement are sprayed onto the mold. Resin and glass can be used separately, or they can be "shredded" from the spray gun of the shredder at the same time. Workers sprayed spray to compact the laminate. Then you can add wood, foam or other core material, and a second spray layer embeds the core material between the laminates. The part is then solidified, cooled and removed from the reusable mold.

Pultrusion

Pultrusion is a manufacturing method used to make strong and lightweight composite materials. In pultrusion, the material is pulled through the molding machine using a handover method or a continuous rolling method (unlike the extrusion method, where the material is pushed through the die). In glass fiber pultrusion, the fiber (glass material) is pulled out of the spool and passed through a device that coats the resin on it. Then they are usually heat treated and cut to length. The glass fibers produced in this way can be made into various shapes and cross-sections, such as W or S cross-sections.

Warping

One notable feature of fiberglass is that the resins used are subject to contraction during the curing process. For polyester this contraction is often 5–6%; for epoxy, about 2%. Because the fibers do not contract, this differential can create changes in the shape of the part during curing. Distortions can appear hours, days, or weeks after the resin has set.

While this distortion can be minimised by symmetric use of the fibers in the design, a certain amount of internal stress is created; and if it becomes too great, cracks form.