Glass fiber reinforced plastic fiber reinforced thermosetting plastic, commonly known as glass fiber reinforced plastic. Abbreviation for FRP membrane housing. The outer shell of the glass fiber reinforced plastic film at both ends is equipped with the head of a pressure vessel, and the inside is equipped with elements of different types of filter membranes. The high pressure FRP membrane housings currently on the market are basically produced by winding technology.
The following is a brief description of the two glass fiber reinforced plastic membrane housing production process technologies mentioned above: First, we introduce the spiral winding technology: the spiral winding technology is that a fiber bundle is wound from a horizontally moving wire nozzle to a rotating core mold. The winding angle is determined by the ratio of the two speeds. The wire winding nozzle reciprocates in the horizontal direction of the core mold, so that the sand line forms a rhombus pattern with a uniform thickness and a constant winding angle around the core mold. The adjacent sand pieces in the same direction are connected without intersecting. Directional fibers intersect. In this way, when the fibers are evenly wrapped around the surface of the core mold, two fiber layers are formed in the cylindrical section. However, it is necessary to indicate that there will be a certain length of fiber chaos at both ends of the core mold. This section should be cut off when making a FRP membrane housing pressure vessels. The pull winding technology is based on the pultrusion technology and adds the hoop winding technology. Specifically, the fiber sand or its fabric is laid or wound on the core mold at different levels, and then the product is pulled out of the forming mold by a traction device. The whole process is continuous, and each layer of fiber sand is only connected without crossing; at the same time, the density and thickness of the product are very uniform, and the dimensional accuracy is taken as an example of a Φ102 × 3mm pipe, whose thickness and inner diameter are less than 0.1mm.
FRP Membrane Housings
So what are the similarities and differences between the two process technologies mentioned above to produce FRP membrane housings? First, as a glass fiber reinforced plastic membrane housing, it is a cylindrical pressure vessel. Therefore, the design of its load-bearing structure should be designed and calculated according to relevant technical requirements such as the thin shell theory. The glass fiber reinforced plastic membrane housing can be divided into three layers, that is, an inner lining layer, a structural layer, and an outer protective layer. The functions of each layer are different. The inner lining layer is a dense resin-rich layer that mainly plays a role of anti-corrosion and anti-seepage; the structural layer is a high-fiber content bearing layer that bears various stress caused by loads; the outer protective layer is a structural layer Glass fiber reinforced plastic aging provides protection and appearance decoration. As a glass fiber reinforced plastic membrane housing, there are basically three appearance colors, namely white, blue and black, mainly white.
