In plastic processing industry, no matter extrusion, injection molding, calendaring, hollow molding, blown film, spinning, etc., in addition to meet the requirements of the host, often also need a large number of auxiliary equipment to work together to complete the various processes . The improvement, automation and rationalization of plastic processing auxiliary equipment to a certain extent, determine the quality of products and business viability.
Plastic auxiliary machinery according to their functions, including the feeding system equipment, temperature control system devices, corner waste recycling crushing equipment three categories, in the plastic processing, respectively, play a different role.
First, the supply system to provide high-quality raw materials
Auxiliary processing equipment for the feed system includes drying, conveying, metering and mixing equipment.
Drying equipment For pre-treatment of pre-manufactured materials such as ABS, POM, PC, PA, PMMA In polyolefin plastic certain During the processing, in order to ensure the quality of the products also have to be highly dry, as in the random copolymer polypropylene PP-R pipe production and pipe injection molding and cross-linked polyethylene polyethylene raw materials also need to be dried to the material Required water content. In the production and processing of raw materials according to product moisture content requirements, but also to use different drying methods and drying equipment. Oven dryers are often used for pellets such as fillers and PVC, rotary double cone vacuum dryers for thermosensitive plastics, and direct hopper dryers for continuous dryers.
For the feeding system, the delivery of powder material using spring tube delivery system and Roots blower-style air delivery system, and particle feeding feeding using vacuum feeders. More centralized feeding equipment for large-scale, automated production technology. Equipment using computer centralized control, all kinds of raw materials in proportion through the metering device weighing into the mixer. Hoppers are equipped with level sensors, according to the amount of material can automatically open or close the storage pipe on the conveyor. The key technology for a centralized feed system is the accurate measurement of the electronic scale, which enables accurate and accurate feeding of the required material.
Second, temperature control to ensure product quality
Plastic processing equipment mainly refers to the heating equipment used for extrusion, injection molding, rolling and other production equipment barrel mold and rolling roller temperature heating controller, the current general use of thermal oil electric heating instead of complex steam heating.
Mold temperature cooler is mainly used in injection molding mold temperature cooling. Generally in the mold design have cooling water channel. Cooler is divided into air-cooled and water-cooled, air-cooled light, but low heat transfer capacity, water-cooled heat transfer, heat transfer effect is good, widely used.
Third, recycling reduce production costs
The proportion of corner waste in plastic processing is about 5% ~ 20% of the total production. It can be said that the recycling of scrap waste to a certain extent determines the lifeblood of enterprises. Plastic processing enterprises pay more and more attention to this. Currently more plastic grinder is divided into suitable for hard products, small volume crushing equipment products; used for soft plastic foam recycling granulation crushing equipment; for pipe, longer profiles of direct products Crushing and granulating mill; Used for recycling of waste silk crusher. In the plastic recycling equipment, is now moving toward low noise, easy operation, set hopper continuous tube conveying the direction of development.
For the continuous crushing of large parts, in order to avoid the plastic parts rolling in the mill for a long time to cut, generate heat so that the plastic becomes elastic state, difficult to crush, developed in the crusher crushed with water-cooled jacket Equipment to ensure the continuous operation of large plastic pieces broken and efficient crushing.