Wood-plastic particle material extrusion molding system

Abstract

The invention discloses a wood-plastic particle material extrusion molding system which comprises a mixing system, a drying system, an extrusion system, a dust removal system and a vacuum system. Theextrusion system comprises a metering hopper, a twin-screw extruder, a heater and a mold former. The twin-screw extruder comprises a casing, a feed inlet, a discharge outlet and a vacuum port, whereina double-helix conveying rod is arranged in the casing; each screw rod is divided into an adding section, a homogenizing section, a melting section and an extrusion section; the adding sections and the homogenizing sections are each of an unequal-groove-depth double-thread structure, and the melting sections and the extrusion sections are each of an equal-groove-depth double-thread structure; andthe width of threads is sequentially decreased from the adding sections to the extrusion sections. According to the wood-plastic particle material extrusion molding system, wood powder is subjected to special drying treatment to form raw material particles, the dried raw material particles can be directly subjected to extrusion processing, moisture in raw materials is reduced, dust extruding outof a workshop is reduced, pollution to the environment caused by dust is avoided, the raw materials are effectively saved, and the raw material loss is reduced; and the problem about dust extruding out of the workshop is effectively solved.

Description

technical field [0001] The invention relates to a wood-plastic production system, in particular to a wood-plastic granular material extrusion molding system. Background technique [0002] Wood-plastic, that is, wood-plastic composites (Wood-Plastic Composites, WPC), is a new type of composite material that has been booming at home and abroad in recent years. It refers to the use of polyethylene, polypropylene and polyvinyl chloride, etc. More than 35%-70% of waste plant fibers such as wood powder, rice husk, straw, etc. are mixed into new wood materials, and then processed by extrusion, molding, injection molding and other plastic processing techniques to produce plates or profiles. Mainly used in building materials, furniture, logistics packaging and other industries. The board formed by hot extrusion after mixing plastic and wood powder in a certain proportion is called extruded wood-plastic composite board. [0003] The wood powder used in wood-plastic is made of crushe...

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Problems solved by technology

[0004] The extrusion molding system in the prior art has the following problems: 1. The existing extrusion system uses wood flour as a raw material, which easily causes high dust content in the workshop and pollutes the environment. At the same time, the dust easily enters the inside of the extruder, causing The extruder equipment is damaged, and the dust needs to be removed regularly, which not only increases the maintenance cost, but also reduces the work efficiency; 2. The existing twin-screw extruder has low foaming efficiency, difficult to control the degree of plasticization, and a long start-up cycle. It is difficult to effectively cooperate with the extruder and the mold; 3. The existing extrusion molding system has low work efficiency and poor extrusion effect

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