METHOD FOR PREPARATION OF COMPOSITE MATERIAL Russian patent published in 2009 - IPC B27N3/02 

FIELD: technological processes.

SUBSTANCE: invention is intended for woodworking and construction industry, and also environmental protection, and may be used in production of different construction materials, furniture panels, etc. Particles of organic filler, in particular wastes of woodworking industry, are ground to size of 1-0.25 mm, fractioned and dried to moisture extent of 3% and below. Then particles of this component and thermoplastic binder are charged with opposite electric charges by means of their supply to surface of rotor that rotates with circumferential speed of 80-120 m/s. As thermoplastic binder you can use domestic waste, such as polyethylene bags, containers. Charged particles of filler and binder are mixed. Mass prepared in mixer is sent through overbridge equipped with bipolar ioniser. Length and diametre of overbridge are such that they provide time of 10-12 sec for mass staying, which is sufficient to achieve residual charge of static electricity by voltage value of 20-500 V/cm. Invention makes it possible to produce cheap items by simple method with density of 0.99-1.00 g/cm³ and flexural length of at least 42 MPa, to recycle wastes, improve ecology and reduce toxicity of items.

EFFECT: production of cheap items by simple method with density of 0,99-1,00 g/cm³ and flexural strength of at least 42 MPa, recycling of wastes, improved ecology and reduced toxicity of products.

1 dwg, 1 tbl