The importance of plastic processing auxiliary equipment in the plastic processing industry, whether it is extrusion, injection molding, calendering, hollow molding, or blown film, spinning, etc., in addition to meet the requirements of the host, often also need a large number of Auxiliary equipment to complete the various processing steps. The perfection, automation and fairness of auxiliary equipment for plastic processing determine the quality of products and the viability of enterprises to a certain extent.
According to its function, the plastic auxiliary machine includes three types of equipment for feeding system, temperature control system device and crushing equipment for corner waste recycling, which play different roles in plastic processing.
Feeding system provides high quality raw materials
The auxiliary processing equipment for the feeding system mainly includes drying, conveying, metering and mixing equipment.
Drying equipment for the preparation of pre-absorbent materials. Pre-treatment of materials such as aBS, polyoxymethylene (POM), polycarbonate (PC), nylon (Pa), and plexiglass (PMMa) in polyolefin-based plastics. In the process of processing, in order to ensure the quality of the product, it is also required to be highly dried. For example, the pipe production of the random copolymer polypropylene PP-R and the injection molding of the pipe and the polyethylene raw material for the cross-linked polyethylene also need to dry the material to the place. The water content required. In the production process, depending on the product's requirements for the moisture content of the raw materials, different drying methods and drying equipment are used separately. Oven dryers are often used for fillers and pellets such as PVC. Rotary double cone vacuum dryers are used for heat sensitive plastics; direct drying is often used for continuous drying.
For the feeding system, the conveying powder is a spring tube conveying system and a Roots blower type air conveying system, and the particle conveying material is a vacuum feeder. Centralized feeding equipment is suitable for large-scale, automated production processes. The equipment is centrally controlled by a computer, and various raw materials are weighed by a metering device in proportion and then fed into the mixer. The hoppers are equipped with level sensors, which automatically open or close the storage tanks on the conveying pipes according to the amount of materials. The key technology of the centralized feeding system is the correct metering of the electronic scale, which can feed the required materials in proportion.
Temperature control guarantees product quality
The heating equipment in the plastic processing process mainly refers to the temperature heating controller of the barrel mold and the calender roll for the production equipment such as extrusion, injection molding and calendering. At present, the heat transfer oil electric heating method is generally used instead of the complicated steam heating method.
The mold temperature cooler is mainly used for mold temperature cooling of injection molding. There are generally cooling water passages in the mold design. The refrigerator is divided into air-cooled and water-cooled, air-cooled and light, but the heat exchange capacity is low, the water-cooled heat exchange is large, and the heat transfer effect is good, which is widely used.
Recycling reduces production costs
The proportion of corner waste in plastic processing is about 5% to 20% of the total production. It can be said that the recycling of corner waste determines the survival of the enterprise to a certain extent. Plastic processing companies are paying more and more attention to this. At present, there are many plastic pulverizers, which are divided into crushing equipment suitable for hard products and small-volume products; pulverizing equipment for recycling granulation of soft plastic foam; direct for long products of pipes and profiles A crusher for crushing and granulating; a pelletizer for waste silk recycling. In the plastic recycling equipment, it is now moving towards the development direction of low-noise, easy-to-maneuver, and continuous feeding of the hopper.
For the continuous pulverization of large-scale parts, in order to avoid the plastic parts being cut and cut in the pulverizer for a long time, heat is generated to make the plastic into an elastic state, and it is difficult to pulverize, and the pulverization with a water-cooled jacket in the pulverizer casing is developed. The equipment guarantees continuous operation and efficient crushing of large plastic parts.
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