Rotary Vacuum Pump in Wood Plastic Extrusion
Effect of Rotary Vacuum Pump on Mechanical Properties of Extruded Products During extrusion of profiles, wood flour must be dried before mixing with thermoplastic resin to remove moisture and volatile components, so that unstable lignin components can be decomposed and volatilized. Finally, a stable wood flour suitable for wood-plastic composite processing can be obtained, but it is difficult to thoroughly water the wood flour in the pretreatment process of wood flour. Bottom drive away. The water content of hydrophilic natural lignocellulosic fibers is higher (the natural water content of lignocellulosic fibers is generally more than 40%). At the same time, loose materials will bring a lot of air from the feeding section. These gases and water will produce a lot of bubbles in the melting section. If these bubbles are left inside the product, the mechanical properties will be greatly reduced; if they are on the surface of the product, they will cause pits and other appearance defects.
Wood-plastic composites have dual properties of plastics and wood. It has good physical properties, better stability than wood, higher hardness than plastic, no wood knots and twills, similar surface grain with wood flooring, similar texture to wood, and can be made into various colorful products, weather resistance, mildew resistance, aging resistance, corrosion resistance, low water absorption, and not easy to deform. Processing, planeable, drillable, sawable, wide range of applications; In addition, it is an environmentally friendly material, recyclable, cheap and readily available raw materials, and biodegradable, made of wood-plastic composites, in reducing environmental pollution, protecting forest resources, and promoting economic development have good benefits.
The residual water vapor in wood flour is pumped out by rotary vane vacuum pump during profile extrusion, which reduces the probability of water vapor forming pore in profile products. This is conducive to improving the mechanical properties of profile products, such as impact strength, maximum load and so on.
2X-A Rotary Vane Vacuum Pump
|Ultimate pressure(Pa)||Partial pressure||6×10ˉ²(5×10-4Torr)|
|Total pressure||2.66(2×10-2 Torr)|
|Cooling Mode||Natural cooling||Water cooling|
|Recommend solenoid valve||DDC-JQ25||DDC-JQ40||DDC-JQ40||DDC-JQ65||DDC-JQ80|
|Noise (dB A)||65||70||70||70||75||90|