Supply system provides high quality raw materials
Auxiliary processing equipment for feeding system mainly includes drying, conveying, metering and mixing equipment.
The drying equipment is used for preprocessing of material before the molding of easy wetting materials, such as ABS, Polyoxymethylene (POM), polycarbonate (PC), nylon (PA), and organic glass (PMMA) in some processing of polyalkene plastics. To ensure the quality of the products, the quality of the products should also be highly dry, such as random copolymerized polypropylene. PP-R pipe production and pipe injection molding and crosslinked polyethylene polyethylene raw materials also need to dry the material to the required water content. In the process of production, different drying methods and drying equipment should be used according to the requirement of products for water content of raw materials. The oven type dryer is often used for the packing and PVC. The rotary double cone vacuum dryer is used for the heat sensitive plastic. The direct hopper drier is often used for the continuous drying.
For the feeding system, the conveying material is made up of a spring pipe conveying system and a Roots blower type pneumatic conveying system, while the granular conveying material is provided with a vacuum feeder. Centralized feed equipment is suitable for large-scale and automated production processes. The equipment is centrally controlled by computers, and all kinds of raw materials are weighed into the mixer by measuring device in proportion. Hopper is equipped with material level sensor, according to the number of materials can automatically open or close the storage barrel on the conveying pipe. The key technology of the centralized feeding system is the accurate measurement of the electronic scale, which can accurately feed the required materials proportionally.
Temperature control to ensure product quality
In the process of plastic processing, the heating equipment mainly refers to the temperature heating controller for the extruding, injection and calendering equipment. At present, the heat conduction oil and electricity heating mode is generally used instead of the complex steam heating.
The mold temperature cooler is mainly used for mold temperature cooling in injection molding. Generally, there are cooling water passages in the mold design. The refrigerating machine is divided into air-cooled and water-cooled, air-cooled and portable, but with low heat exchange capacity, large water cooled heat exchange and good heat exchange effect.
Recovery and utilization to reduce production costs
The proportion of side angle waste in plastic processing is about 5% ~ 20% of the total production, which can be said to determine the lifeblood of the enterprise to a certain extent. Plastic processing enterprises have paid more and more attention to this. The plastic pulverizer, which is widely used at present, is divided into crushing equipment suitable for hard products and small volume products; the pulverizing equipment for the recycling and granulation of soft plastic foam; the mill for direct crushing and granulation for long products of pipes and sections; and the pelletizing machine for waste silk recycling. On the plastic recycling equipment, it is now heading towards the development direction of low noise, easy operation, and hopper continuous pipe conveying and discharging.
For the continuous crushing of large parts, in order to avoid the long time turning and cutting of the plastic parts in the mill, the heat makes the plastic into the elastic state, and it is difficult to comminence. The continuous operation and high efficiency comminution of the breakage of the large plastic parts in the shredder's shell is developed to ensure the crushing of the large plastic parts.