In the modern plastics processing industry, whether it is injection molding, extrusion or blow molding, whether it is the production of hollow containers, films, pipes or special profiles, in addition to a host machine that meets the requirements, a large number of auxiliary equipment are often required. to complete various processing techniques together.
dosing and mixing systems
Precise dosing is one of the most basic requirements in the plastics processing industry. Dosing and mixing systems are used to add materials to the main machine. Dosing and mixing systems are generally divided into gravimetric blender systems and volumetric doser systems. The gravimetric blender the material to determine the amount of addition, which is more common in the plastics processing industry, especially for granular materials; while the volumetric doser measures the volume to determine the amount of addition. The gravimetric type provides higher accuracy compared to the volumetric type.
The plastic processing industry has entered the stage of large-scale production. Especially in the plastic packaging industry, such as the production of PET bottles, it is often required to feed multiple, dozens or even hundreds of equipment at the same time. It is neither convenient nor economical to use a stand-alone feeder. The use of a central dosing system becomes inevitable. The central conveying system uses a central power source to transport materials to the destination. It has the advantages of high degree of automation, energy saving, safety and reliability. Some central feeding systems also have dust collection functions, which can improve the working conditions next to the main machine and reduce dust. pollution, improve production efficiency and product quality. The advanced central feeding system can control the work of dozens or even hundreds of feeding machines at the same time.
Consistency is crucial in the production of plastic products, for which plastic resins and other materials can be mixed in a predetermined ratio in an automated way. This is done before the main machine is processed and has a variety of options. The first option is to work by hand, and while this may be an economical initial investment, in the long run it may result in excessive use of expensive additives, high scrap rates and poor overall quality. Another option is to purchase premix, which is an expensive option and means the mix is under the control of the supplier and making changes to the mix at short notice can be a challenge.
The gravimetric mixer not only controls the additives entering the molding machine, but also controls all the necessary components of the formula. For example, virgin materials, recycled materials and pigments are all precisely mixed together in a controlled and repeatable procedure.
