Selection and processing of wood flour

Mar 18th 2015 at 7:41 PM

Wood flour applied technology generally no big stringent requirements, various types of wood flour and a variety of plant fibers, etc. can be used in general (sawdust produced during wood processing, waste crushed can be), for Effect processing is not large, the main requirements of various wood flour particle size is generally 20 ~ 100 mesh, on this basis, to ensure that the wood meal and plastic for drying prior to mixing. General flour moisture content should be controlled within 3%. Drying equipment can be electric heating, microwave heating can also be dried or dry.waterproof vinyl membrane flooring

After drying the wood flour should be stored in that dry place (indoor), not secondary to absorb moisture, otherwise it will process a greater impact. Need to be mentioned is that when using an extruder with a vent function, especially a twin screw extruder and processing wood materials, wood flour can not be special drying, natural drying can only direct sunlight were extruded. For the wood processing wood processing is divided into two major categories of chemical and physical methods:composite board on board fence

Chemical methods: (1) the surface graft method: graft modification is an effective method, before a composite or composite plant fiber simultaneously graft. As can with maleic anhydride, isocyanate, etc. grafted plant fibers.

(2) interfacial coupling method: forming a covalent bond with a coupling agent and plant fibers to alter the interfacial adhesion. Such as silane coupling agent, titanate coupling agent, aluminum coupling agent such as processing fibers, fiber and resin to improve compatibility. The optimum amount of coupling with the coupling to the extent related to the particle surface covered with flour. If the coupling agent is too small, because of the filler surface cladding is not complete, it is difficult to form a good coupling of the molecular layer, would not achieve the desired coupling and compatibilization. Amount too much, then the coupling surplus in excess flour surface will be covered by coupling molecules form a multi-molecular layer, causing unevenness easy interface structure between the filler and resin, and the unreacted coupling agent Other groups also have adverse effects, thereby reducing the mechanical properties of the composites.wpc decking prices

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