Plastics industry is the pillar of the national economy. Plastic machinery industry and plastic manufacturing industry to provide processing equipment, in recent years, China's plastic machinery industry is developing rapidly, its development rate and the main economic indicators created in the machinery industry, 194 industries ranked among the top. Plastic machinery annual manufacturing capacity of about 200,000 units (sets), a full range of categories.

Although China's rapid development of plastic machinery, production of more varieties, basically to supply domestic plastic raw materials processing about plastic products processing, molding the general technical equipment required, individual products also into the world's forefront, but compared with developed countries in the industry, China's plastic machinery there is a big gap, mainly in the variety of less, high energy consumption, low level of control, unstable performance and other aspects.

Plastic machinery classification

Plastic extrusion machine, plastic injection molding machine, plastic film machine, film blowing machine, plastic film bag making machine, plastic laminating machine

Plastic machinery requirements for inverters

Plastic Extruders

Extruder is the production equipment for manufacturing plastic sheet, film, various shaped pipes, etc. Plastic is plasticized into a uniform melt through the extruder, and under the action of the pressure established in plasticization, the head is continuously extruded through the screw at a fixed temperature, a fixed quantity and a low pressure.

1. between the speed of the screw and the driving power, which is a constant torque load control.
   
2. constant screw speed without sudden changes in the extrusion process.
   
3. Constant pressure, when the demand pressure is reached, the speed control switches to pressure control. No shock when switching, and pressure PID control is realized after receiving the pressure signal.
   
4. For high speed or high performance need vector closed loop control. 
   

Injection Molding Machine

Injection molding machine is also known as injection molding machine or injection machine. It is the main molding equipment for making plastic products of various shapes from thermoplastic or thermosetting materials using plastic molding molds. The injection molding machine can heat the plastic and apply high pressure to the molten plastic to make it shoot out and fill the mold cavity. 

1. Make the quantitative pump into an energy-saving variable pump, so that the hydraulic system of the injection molding machine matches the power required for the operation of the whole machine, without high pressure throttling overflow energy loss.
   
2. High efficiency and energy saving.
   

Blister Machine

Suction molding machine (also called thermoforming machine) is a machine that heats and plasticizes PVC, PE, PP, PET, HIPS and other thermoplastic rolls into various shapes of advanced packaging and boxes, frames and other products.

After adding frequency converter, it can reduce power consumption, improve transmission efficiency, smooth speed and high precision.

ZFENG Inverter Solutions

ZFENG Electric's high performance, multi-functional, inverter ZF series is widely used in the plastic machinery industry. The following is the solution of EM series in plastic machinery industry.

Application of Zhufeng ZF3000 inverter on plastic extruder

Before retrofitting: Sliding differential motor speed control

改造后：采用变频器调速

Everest ZF3000 inverter integrated cabinet on injection molding machine

ZF3000 is a high-performance vector inverter, which automatically adjusts the speed of oil pump motor to control the oil pump supply according to the current working status of the injection molding machine, ensuring that the oil supply of the oil pump is consistent with the hydraulic load of the injection molding machine in each working stage, and the oil pump motor has the least energy consumption in a complete injection working cycle, eliminating the overflow phenomenon and ensuring that the processing quality and efficiency of the injection molding machine are not affected in any way.

Everest inverter solution features

Extruder

1. Saving power at 25%~60% and improving power factor.
   
2. Change the quantitative pump into an energy-saving variable pump, so that the hydraulic system of the injection molding machine matches the power required for the operation of the whole machine, without high pressure throttling overflow energy loss.
   
3. High reliability. Retain the original control method and oil circuit, find fault timely alarm, with overvoltage, undervoltage, overcurrent, overload, overheating and short circuit to ground and other protection, but also effective protection of the oil pump motor.
   
4. Frequency conversion soft start, no inrush current, smooth starting . Reducing the vibration of the unlocking membrane and noise.
   
5. Industrial/inverter switching .
   
6. Simple operation, synchronous operation with the injection molding machine, without any adjustment.
   

Injection molding machine

1. Easy to install, no need to make changes to the injection molding machine, retaining the original control method and oil circuit.
   
2. Saving electricity at 20%~60%, improving power factor.
   
3. Free switching of industrial/inverter operation mode, even if the inverter is faulty, switching industrial frequency operation, does not affect normal production. Fault automatic reset function, to ensure continuous production.
   
4. So that the quantitative pump into an energy-saving variable pump, so that the hydraulic system of the injection molding machine and the power required for the operation of the whole machine to match, no high-pressure throttling overflow energy loss.
   
5. High reliability. The alarm is found in time, with over-voltage, under-voltage, over-current, overload, overheating and short-circuit to ground protection, but also effective protection of the oil pump motor.
   
6. Frequency conversion soft start, no inrush current, smooth starting . Reduce the vibration of the unlocking membrane, reduce noise and extend the life of the machine. 
   
7. Simple operation, synchronous operation with the injection molding machine, without any adjustment. Operators do not need training, does not affect the production and processing efficiency.