Explanation

hand lay-up is a kind of molding method for composite materials parts mainly based on manual operation. Also known as contact molding, "evenly brush (or spray) the mold with releasing agent A layer of resin? Then manually lay reinforcement materials and apply resin glue solution. Repeat the steps of laying and applying glue until the required thickness is reached, and then conduct curing molding. reinforcement materials for hand lay-up shall be easy to be soaked by resin and have certain geometric deformation, mainly including non twisted coarse gauze, twisted cloth, glass cloth tape, chopped felt and surface felt. The resin used should have good wettability to reinforcement materials, and the viscosity should be appropriate (0.2 ± 0.8 Pa, s). The commonly used resin is unsaturated polyester resin and annular resin. Other resin are seldom used. The characteristics of its technology are that it does not require specialized equipment, the mold is simple, the investment is low, and the production technology is simple and easy to learn, making it suitable for on-site preparation of large products that are not suitable for transportation. Its disadvantages are low production efficiency, a large amount of waste, which is not suitable for mass production. Product quality is highly dependent on human operation level, poor performance stability, low load-bearing capacity, strong odor, large dust, and poor production environment. It is mainly used for the molding of composite materials parts that are not pressurized, single-sided and smooth, and curing at room temperature. It is suitable for products with large size, small batch and low use requirements, such as fishing boats, yachts, large building parts, etc.

Classification