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Development direction of wood plastic composite production technology
Co-extrusion technology began to develop
Single-material extrusion molding is still the mainstream molding processing method for plastic wood composite products, which is used to manufacture plates, profiles, and pipes. In recent years, on the basis of single material extrusion, a co-extrusion process has been developed. There are two main types of co-extrusion products: one is to co-extrude a layer of functional material on the surface of the plastic-wood product to improve the appearance strength of the product, enhance the wear resistance, and the ability to resist ultraviolet rays. This is the surface co-extrusion technology of the plastic-wood profile. The other is to strengthen the overall strength of plastic wood composite products, with steel or aluminum profiles, bamboo boards, etc. As the core material, and a layer of plastic wood composite material on the surface of the co-extrusion technology. Plastic wood composite co-extrusion products not only improve the performance of products, but also expand the application fields and product categories, and promote the diversification of plastic wood composite products.
Micro-foaming technology continues to advance
In recent years, plastic wood composite micro-foaming technology has also been greatly developed. In order to meet the requirements of product performance, it is necessary to develop new processing techniques, introduce foaming technology, reduce material costs, and expand the scope of use of WPC. Although plastic wood composite materials have many advantages, the greater density is its biggest disadvantage, which limits its application range. In order to reduce the density of plastic wood composite materials without reducing the physical and mechanical properties of the composite materials, the requirements of light weight and high strength are put forward for the plastic wood composite materials. After foaming, the plastic wood composite material not only reduces the density, but also improves some of the physical and mechanical properties, so that it can be used as the light and high-strength parts required by the automotive industry, sports equipment, packaging, and construction industries.
Application of surface modification technology
In order to improve the usability and surface aesthetics of plastic wood composite products, post-treatment of the surface of plastic wood composite products is also indispensable. At present, surface post-treatment technologies mainly include: belt sanding treatment, embossing treatment, water transfer and thermal transfer, UV printing and solid wood leather composite. These technologies have been successfully applied to the surface post-treatment of plastic wood composite materials, greatly improving their aesthetics and added value.
Plastic wood composite materials have begun to penetrate into a broader field of building structures through the development and application of outdoor decking, fences, tables and chairs, etc., from products such as pallets, packaging boxes, and automotive interior parts at the beginning of development, and strive to achieve the building structure the mechanical performance requirements and external decorative effects of parts and other products, including door and window products, decorative panels, furniture panels and building foundation parts. Correspondingly, higher requirements for material performance are also put forward, such as: anti-aging, anti-discoloration, and long service life for outdoor garden management products; good flame retardancy for indoor doors, windows and decorative materials; the load-bearing products of building foundations must have high mechanical properties, and need to be reinforced and modified to resist creep. With the improvement of energy-saving requirements, the construction industry has also put forward higher requirements for the energy-saving effect of plastic wood composite products. Therefore, plastic wood composite materials are moving towards functionalization and high added value to adapt to a wide range of application fields, such as flame retardant, reinforced, anti-aging, anti-creep, thermal insulation and energy storage adjustment warm type will become the direction pursued by the industry.