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本设计根据设计任务书所下达的任务，顺利完成对长纤文增强聚丙烯板材车间工艺的设计。在整个设计过程中，我对生产长纤文增强聚丙烯板材的流程有了一个全面的认识。并根据所学的专业知识，结合自己在认知实习中的经验，灵活应用，为今后从事相关的生产管理工作打下了一定的基础。
本设计由高楠老师指导，提出了许多宝贵意见和积极建议，帮助我提高了设计质量。与设计同学一同的探讨也为设计带来许多帮助。在此，我表示衷心感谢。
由于长玻纤增强聚丙烯板材车间工艺设计涉及的知识面很广，而我的知识和经验有限，设计错误和不妥之处，恳请批阅老师批评指正。
Illustration
With the rapid development of the national economy, high-performance, low-cost thermoplastic resin-based composite materials are widely used. Thermoplastic resin by adding reinforcing fibers and resin modification techniques to prepare a fiber-reinforced thermoplastic resin matrix composites (including new structural composites, functional composite materials, etc.) is an effective method for the development of new materials. This has become the consensus of industry, technology, and this is the practical realization of special engineering plastics, engineering plastics, functional, the best general-purpose plastics engineering technology roadmap. Long fiber reinforced thermoplastics (LFT) has excellent impact resistance, good dimensional stability and chemical stability, and can be recycled many other advantages, has become an ideal material for the automotive industry to achieve high gain low cost targets, is currently in the international market very active on a variety of composite materials development. LFT substrate material is mainly polypropylene (PP), with account for more than 70%.
The design of long glass fiber reinforced polypropylene sheet will have long glass fiber and polypropylene two different materials together, make full use of the advantages of both, get both excellent performance of both new material, which in theory and practical applications are of great significance, I believe that the design can be interested in the production and development of high performance for long glass fiber reinforced polypropylene sheet production enterprises have some reference.
According to the design plan, the design of the annual output of 5,000 tons of long glass fiber reinforced polypropylene sheet metal workshop process design. Through access to a large amount of literature and cognitive training, recipe, process, glass fiber processing, additives added, production equipment, such as a scientific demonstration and design.
Ask for the long glass reinforced polypropylene sheet production process, there are three steps: pre-plasticized in the first stage with the twin-screw extruder, complete the initial reaction of polypropylene. In the second stage subsequently further plasticizing different to the twin-screw extruder, adding pre-treated glass fibers. Finally extruder, calendering and other follow-up work. Depending on the various aspects of these three steps, the design reference standards, select the appropriate formulation and production process conditions.
Important feature of this design is that the use of long glass fiber reinforced polypropylene one-step molding, reducing the savings needed for cooling granulation process, the time and energy required for forming, avoid reheating part of the project polypropylene degradation, so that integrated performance products. And since the increase in the product and ensures the fiber length, so that the strength and rigidity of the article must be improved. Moreover, because the molding cycle is short, convenient recycling and other advantages, the country is being gradually extended applications.
The design for the production of long glass fiber reinforced polypropylene sheet main production equipment for the equipment selection and design, and to determine the appropriate technical parameters. Production of major equipment involved are co-rotating twin-screw extruder, different to the twin-screw extruder, mixer, glass fiber pre-treatment machine, rolling machine, setting machine, traction machine, cutting machine, according to the actual production conditions, provides the selected device and the corresponding manufacturers. Wherein the double twin-screw extruder is designed to focus. The design of the twin-screw extruder design refinement, include selecting materials, nose, mouth die, relevant technical parameters, etc..