Hand lay-up is the simplest and oldest open molding method for fabricating composites. At first, dry fibers in the form of woven, knitted, stitched, or bond fabrics are manually placed in the mold, and a brush is used to apply the resin matrix on the reinforcing material.
Resin transfer molding (RTM) is an intermediate volume molding process for producing composites. In RTM, resin is injected under pressure into a mold cavity. This process produces parts with two finished surfaces. Vacuum assist can be used to enhance resin flow in the mold cavity.
In the HP-RTM process, a fiber preform is placed on the mold, the mold gap is maintained constant, and the resin and curing agent are mixed at high pressure in the mixing head and then injected into the preform. When the resin is filled, the laminate is compressed by pressing.
The double-station continuous VARTM production line, combined with the SMC forming process principle, retains the advantages of the continuous fiber of the RTM process, and meets the requirements of mass production.
Vacuum assisted resin transfer molding (VARTM for short) is a liquid molding process for preparing high-performance, large-size, low-cost composite products.
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