Brief introduction of glass fiber reinforced plastic cable bridge
Glass fiber reinforced plastic cable bridge is mainly composed of glass fiber reinforced material and inorganic adhesive compound fireproof board and metal skeleton compound and other fireproof base material. The outer fire paint, not burning fireproof bridge after encounters fire, thus blocking the spread of fire, with the fire retardant effect is extremely good, but also has the fire, oil resistance, corrosion resistance, non-toxic, no pollution, convenient installation, reasonable overall structure, long service life and beautiful, the cable installed in cable tray, environment clean, convenient cleaning. Fire retardant coating has the characteristics of thin coating, high fire resistance and strong adhesive force. Glass fiber reinforced plastic instrument bridge has water, oil, flame retardant, chemical resistance, mainly used in chemical, metallurgical, power plants, substations and other indoor and outdoor cable laying. Products in strict accordance with the Q/321182 APJ001 - 2004 enterprise standards and GB8624 - 1997 National standards. According to the national standard GB8624 - 1997, "building materials combustion classification method" test, fire resistance for B1 grade.
Glass fiber reinforced plastic cable tray is suitable for power cables with voltage below 10 thousand volts, and indoor and outdoor cable trench and tunnel laying for control cables, lighting wiring, pneumatic and hydraulic pipe cables, etc.. Glass fiber reinforced plastic cable tray consists of glass fiber reinforced plastic and flame retardant and other materials. It is pressed by composite molding material and stainless steel screen. Due to its materials thermal conductivity and flame retardant low the product not only has the fire insulation, self extinguishing, and has high corrosion resistance, but also has the advantages of light structure, aging resistance, safe and reliable, can be conveniently matched with the metal bridge used in chemical industry, metallurgy, petroleum and other strong corrosive environment has been used.
Work lining glass fiber cloth, using three noes (no alkali, no wax, no twist), glass fiber spinning.
The filling material adopts lightweight aluminium hydroxide to reduce its weight, thereby improving the carrying capacity of the glass fiber reinforced plastic cable tray.
Glass steel cable bridge, connecting any end surface and a connecting hole strong corrosion proof, anti external force measures.
The main anticorrosion layer, bonding layer and protective layer are required to be formed at once.
Have strong corrosion resistance, in the bad acid, alkali, salt, ammonia and other environments, service life of 30 years, not aging, not fading.
Pultrusion process of glass fiber reinforced plastic cable bridge
The typical pultrusion process consists of feeding, dipping, preforming, solidification, traction and cutting. The process shown in Figure 7 - 11 roving drawn from the yarn, after dipping in cluster into glue tank, then enters the pre forming die, remove excess resin and remove air bubbles in the compacting process, and then into the molding die. Prior to entering the die, additional reinforcement is applied to the fiber. Glass fiber and resin are formed in the forming die, cured by a heating furnace, then pulled out by a pulling device, and finally cut from the cutting device into the product of the required length. Different methods and equipment can be used in every process of the production process. For example, there are intermittent and continuous traction traction traction; curing method in mold curing, curing furnace, several high frequency curing and molten metal solidification; in addition, can also be impregnated after winding film or knitted fabric reinforced hoop. In actual industrial production, various intermediate links of the process can be chosen according to requirements.
Several molding curing methods in pultrusion process of FRP cable tray
First, forming hot mold - subsection curing
The material passes through the molding hot mold, the resin heats up to the gelled state, simultaneously molded, and then enters the heating furnace to solidify. The process of traction and molding of this method is continuous, so the production efficiency is higher. The quality of the product depends on whether the molding has reached the gel state when it passes through the molding die. If the export in the hot forming mold resin cementitious material has not yet reached the state, not forming; sometimes in molding at the material outlet has been basically finalized, but did not fully reach the resin gelatin, curing in heating furnace due to the restriction of shape without mould, products are easy to deformation. Therefore, must strictly control the mold temperature and pulling speed, to ensure that the material is pulled out in molding hot mold has been completely the same after gel; resin and reinforcing material adhered tightly to the resin filler should not be too much, the gel content should be controlled properly. The molding method is usually used for pultrusion of bars.
Two, forming hot mold - a cure
The material is molded and cured at once by molding the mold, and no heating furnace is thereafter. Its characteristic is that the surface of the product is good, and generally does not have to be processed two times. The process is adaptable and can produce large components (including hollow profiles, etc.). However, as the product is molded in a mold, the traction speed shall be strictly controlled and not too high. This method is generally suitable for polyester resin formulations, and with release agent.
Three 、 high frequency heating molding
As with the former method, the material is finalized and solidified at once through the molding die, but the heat source uses a high frequency electric field. Due to the high frequency heating, the material t is uniformly heated inside and outside the material, so the thick wall profiles can not be cracked; at the same time, because of the high curing speed, the traction speed can be increased. But the mold must be used in the high-frequency electric field will not produce thermal effects of non-polar materials; resin formulations and filler content must also be determined by high-frequency curing test.