In the plastics processing industry, whether it is extrusion, injection molding, calendering, hollow molding, blown film, spinning, etc., in addition to the host that meets the requirements, there are often a large number of auxiliary equipment to complete the various processing processes together. . The improvement, automation and rationalization of auxiliary equipment for plastics processing determine the quality of products and the viability of enterprises to a certain extent.
According to its function, plastic auxiliary equipment includes equipment for the feeding system, temperature control system, and smashing equipment for corner waste recycling. They play different roles in the plastic processing.
Feed system provides high quality raw materials
The auxiliary processing equipment for the feeding system mainly includes drying, conveying, metering, and mixing equipment.
Drying equipment is used to pre-treat the material before forming the hygroscopic material, such as ABS, polyoxymethylene (POM), polycarbonate (PC), nylon (PA), polymethyl methacrylate (PMMA) in some polyolefin plastics. During the processing, in order to ensure the quality of the product, it is also required to be highly dry. For example, in PP-R random polypropylene pipe production and pipe injection molding, and cross-linked polyethylene raw material also need to dry the material to the Required water content. In the production and processing, according to the requirements of the product on the raw material moisture content, but also use different drying methods and drying equipment. Oven dryers are often used for pellets such as fillers and PVC. Rotary double cone vacuum dryers are used for heat-sensitive plastics; continuous dryers often use direct hopper dryers.
For the feeding system, the powder conveying material adopts the spring tube type conveying system and the Roots blower type air sending system, and the particle conveying material adopts the vacuum feeder. Centralized feeding equipment is mostly suitable for large-scale, automated production processes. The equipment is controlled by a computer, and various raw materials are weighed in proportion to the metering device before entering the mixer. The hoppers are equipped with level sensors, which can automatically open or close the storage tanks on the pipeline according to the amount of material. The key technology of the centralized feeding system is the accurate measurement of electronic scales, which can accurately feed the required materials in proportion.
Temperature control guarantees product quality
Heating equipment mainly refers to the heating equipment used in extrusion, injection molding, rolling and other production equipment barrel temperature and temperature control heating roller controller, the current general use of heating oil heating method instead of complex steam heating.
Mold temperature coolers are mainly used for injection mold temperature cooling. In general, there are cooling water passages in the mold design. The refrigerator has air-cooled type and water-cooled type, and the air-cooled type is light, but the heat exchange capacity is low, the water-cooled heat exchange is large, and the heat exchange effect is good, and is widely used.
Recycling reduces production costs
In the plastic processing, the proportion of corner scrap is about 5% to 20% of the total production volume. It can be said that the recycling of corner scrap material determines the lifeblood of a company to a certain extent. Plastic processing companies are paying more and more attention to this. At present, more plastic crushers are used, which are divided into crushing equipment for hard products and small-volume products; crushing equipment for recycling of soft plastic foams; and direct products for long products such as pipes and profiles. Granulators for crushing granulators; granulators for waste wire recycling. In plastic recycling equipment, it is now moving towards low noise, easy operation, and continuous hopper discharge of the collection hopper.
For the continuous crushing of large parts, in order to avoid plastic parts turning and cutting in the crusher for a long time, heat is generated to make the plastic into an elastomer state, and it is difficult to crush, and a crusher jacket with a water-cooled jacket is developed. The equipment guarantees continuous operation and efficient comminution of crushing of large plastic parts.
According to its function, plastic auxiliary equipment includes equipment for the feeding system, temperature control system, and smashing equipment for corner waste recycling. They play different roles in the plastic processing.
Feed system provides high quality raw materials
The auxiliary processing equipment for the feeding system mainly includes drying, conveying, metering, and mixing equipment.
Drying equipment is used to pre-treat the material before forming the hygroscopic material, such as ABS, polyoxymethylene (POM), polycarbonate (PC), nylon (PA), polymethyl methacrylate (PMMA) in some polyolefin plastics. During the processing, in order to ensure the quality of the product, it is also required to be highly dry. For example, in PP-R random polypropylene pipe production and pipe injection molding, and cross-linked polyethylene raw material also need to dry the material to the Required water content. In the production and processing, according to the requirements of the product on the raw material moisture content, but also use different drying methods and drying equipment. Oven dryers are often used for pellets such as fillers and PVC. Rotary double cone vacuum dryers are used for heat-sensitive plastics; continuous dryers often use direct hopper dryers.
For the feeding system, the powder conveying material adopts the spring tube type conveying system and the Roots blower type air sending system, and the particle conveying material adopts the vacuum feeder. Centralized feeding equipment is mostly suitable for large-scale, automated production processes. The equipment is controlled by a computer, and various raw materials are weighed in proportion to the metering device before entering the mixer. The hoppers are equipped with level sensors, which can automatically open or close the storage tanks on the pipeline according to the amount of material. The key technology of the centralized feeding system is the accurate measurement of electronic scales, which can accurately feed the required materials in proportion.
Temperature control guarantees product quality
Heating equipment mainly refers to the heating equipment used in extrusion, injection molding, rolling and other production equipment barrel temperature and temperature control heating roller controller, the current general use of heating oil heating method instead of complex steam heating.
Mold temperature coolers are mainly used for injection mold temperature cooling. In general, there are cooling water passages in the mold design. The refrigerator has air-cooled type and water-cooled type, and the air-cooled type is light, but the heat exchange capacity is low, the water-cooled heat exchange is large, and the heat exchange effect is good, and is widely used.
Recycling reduces production costs
In the plastic processing, the proportion of corner scrap is about 5% to 20% of the total production volume. It can be said that the recycling of corner scrap material determines the lifeblood of a company to a certain extent. Plastic processing companies are paying more and more attention to this. At present, more plastic crushers are used, which are divided into crushing equipment for hard products and small-volume products; crushing equipment for recycling of soft plastic foams; and direct products for long products such as pipes and profiles. Granulators for crushing granulators; granulators for waste wire recycling. In plastic recycling equipment, it is now moving towards low noise, easy operation, and continuous hopper discharge of the collection hopper.
For the continuous crushing of large parts, in order to avoid plastic parts turning and cutting in the crusher for a long time, heat is generated to make the plastic into an elastomer state, and it is difficult to crush, and a crusher jacket with a water-cooled jacket is developed. The equipment guarantees continuous operation and efficient comminution of crushing of large plastic parts.
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