When low-smoke halogen-free flame retardant wire and cable materials are extruded, the following points must be noted.
(1) The choice of extruder. Because low-smoke halogen-free flame-retardant wire and cable materials have many additives and large melt viscosity, extruders with low screw compression should be used. The single-screw extruder has a low shear rate and poor mixing capacity. The twin-screw extruder has a high mixing capacity, but the processing of high-filled low-smoke halogen-free flame retardant wire and cable materials is often due to excessive shear. The problem of material decomposition, discoloration, etc. arises. Therefore, it is preferable to use a single-screw and twin-screw combined two-stage mixing extruder. According to reports, the reciprocating single-screw mixer is currently the ideal low-smoke halogen-free flame retardant wire and cable processing equipment.
(2) The choice of processing technology. In addition to the use of a suitable extruder, the processing process must also be reasonable. If the temperature is too high, the auxiliary agent will decompose and cause the product to have pores; if the temperature is too low, poor plasticization will occur. The body pressure should be reduced as much as possible. The screw speed should not be too high. Under the condition that the material is fully plasticized, the extrusion temperature should be properly reduced. The processing technology should be adjusted according to different materials and different recipes.
(3) Before the material is extruded, it must be dried so as to avoid pores in the product section.
(4) Due to the poor fluidity of the material and the large frictional resistance of the equipment, silicone can be added to improve the dispersibility of the inorganic flame retardant and reduce the processing torque. The addition of silicone can improve the flame retardant properties of wire and cable materials and is a good processing aid.
In short, the low-smoke halogen-free flame-retardant wire and cable materials have strict requirements on processing equipment and process conditions, and must be selected according to the characteristics of raw materials, product performance and extrusion characteristics suitable extrusion equipment and process conditions.
Main business: rubber cable , mine communication cable, communication cable, mining control cable , control cable, mining signal cable , general rubber cable
(1) The choice of extruder. Because low-smoke halogen-free flame-retardant wire and cable materials have many additives and large melt viscosity, extruders with low screw compression should be used. The single-screw extruder has a low shear rate and poor mixing capacity. The twin-screw extruder has a high mixing capacity, but the processing of high-filled low-smoke halogen-free flame retardant wire and cable materials is often due to excessive shear. The problem of material decomposition, discoloration, etc. arises. Therefore, it is preferable to use a single-screw and twin-screw combined two-stage mixing extruder. According to reports, the reciprocating single-screw mixer is currently the ideal low-smoke halogen-free flame retardant wire and cable processing equipment.
(2) The choice of processing technology. In addition to the use of a suitable extruder, the processing process must also be reasonable. If the temperature is too high, the auxiliary agent will decompose and cause the product to have pores; if the temperature is too low, poor plasticization will occur. The body pressure should be reduced as much as possible. The screw speed should not be too high. Under the condition that the material is fully plasticized, the extrusion temperature should be properly reduced. The processing technology should be adjusted according to different materials and different recipes.
(3) Before the material is extruded, it must be dried so as to avoid pores in the product section.
(4) Due to the poor fluidity of the material and the large frictional resistance of the equipment, silicone can be added to improve the dispersibility of the inorganic flame retardant and reduce the processing torque. The addition of silicone can improve the flame retardant properties of wire and cable materials and is a good processing aid.
In short, the low-smoke halogen-free flame-retardant wire and cable materials have strict requirements on processing equipment and process conditions, and must be selected according to the characteristics of raw materials, product performance and extrusion characteristics suitable extrusion equipment and process conditions.
Main business: rubber cable , mine communication cable, communication cable, mining control cable , control cable, mining signal cable , general rubber cable
Antique Brass Kitchen Faucet
Value of antique brass kitchen faucets may vary rather significantly. Their prices depend on faucet body material, brand, Area of production, spout swivel, cartridge, number and design of handles, pull-out spout and built-in water filter. When choosing antique brass kitchen faucet and other accessories for retro, country and classic style interiors it is very important to make sure that style, shade of color and size of all the items match perfectly.
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