High-grade multi-layer coextrusion casting machine control system

There are many processing methods for multi-layer composite films, which can be summarized as coating, laminating and co-extrusion methods. The composite process of the coating method and the lamination method is basically similar. Simply put, the adhesive is used to make a film with another substrate (ie, film, paper or metal foil, etc.), or a multi-layer film with a substrate. Combination of wood. The co-extrusion method is a relatively new type of multilayer composite film processing method that has just been developed in recent years. In this method, a plurality of polymer melts are brought together by a special die to form a film-like melt stream composed of a plurality of layers of different polymer melts and cooled to obtain a multilayer co-extruded composite film. At present, the production of coextruded composite films in China has gradually matured. The packaging composite films produced by this process have high barrier properties, high strength, good heat resistance, no residual solvent contamination, light weight, and thin film walls. . Therefore, it is widely used with its unique advantages. In addition, the process not only greatly reduces the production process, but also reduces the expensive materials. The single-layer film can be as thin as 2 micron, which can save 30% of the production cost compared with the coating method or laminating method. .

First, use and characteristics

Now China's three- and three-tier co-extruded composite film production domestic equipment has dominated, mainly producing functional composite heat-sealable substrates, heat-shrinkable films, stretch film, and large-area films; and five-and-five-layer or more The production of co-extruded composite films is still based on imported equipment. It mainly produces functional composite heat-sealable substrates and high-impervious co-extruded composite films. With the development of economy and advancement of science and technology, China also has some packaging equipment manufacturers. Based on the introduction of foreign advanced five-layer co-extrusion technology, it actively develops and develops five- to seven-layer high-grade multi-layer coextrusion casting machines. , And has made gratifying success, effectively promoted the multi-layer co-extruded composite film production equipment to the precision, multi-layered, large-scale and efficient, energy-saving direction.

On the basis of absorbing and digesting Germany's advanced multi-layer co-extrusion technology, Foshan Feiyou Automation Co., Ltd. combined closely with China's specific conditions and cooperated with Foshan Wanjia Plastics Co., Ltd. to research and develop high-end multilayers from 3 to 7 layers. Squeeze casting machine control system. Recently, this control system was installed on a five-layer co-extruded casting unit developed and produced by Foshan Wanjia Plastics Co., Ltd., and the entire machine was successfully tested and debugged.

The control system uses a German Siemens S7-315 PLC programmable controller for overall machine control. The human-machine interface uses a 10.4 inch HITECH color touch screen, and through the PROFIBUS communication bus, the extrusion system, casting device, and traction system are realized. ,Floating roller control system and winding tension control system and other closed-loop automatic control. Another automatic roll change and cutting materials and other functions. The system has a high degree of automation, is simple and intuitive to operate, and can be fully parameterized and displayed in a centralized manner. With operability, high speed stability and durability advantages. It is a high-tech, high-value-added New Product integrating light, machine, electricity, gas, liquid, and various controls. It marks the synchronization with the latest international technology and can be compared with similar foreign products. In the domestic industry in the leading level, and cost-effective, is the best choice for various packaging machinery and equipment factory.

Second, the basic configuration of the system

1. The whole system: The entire control cabinet is equipped with a German Siemens S7-315-2DP PLC programmable controller for overall machine control, and through the modules SM321, SM322, SM331 and PROFIBUS communication bus control extrusion system DC adjustment Speed ​​motor, casting drive system and winding system variable frequency motor.

2. Extrusion system: The extrusion system is equipped with three DC speed control motors, one feed mixing motor and heating material system. The SM321 SM322 SM331 quad 12-bit analog output of the S7-315 PLC programmable controller controls the start, stop, speed regulation, fault display, and fault reset of three DC speed-regulating motors and one feed-stirring motor.

3. Casting device: The casting device is equipped with one 5.5KW cast roller motor, one 3KW cooling roller motor, one 4KW blower blade blower, and one 4KW suction blade blower. The S7-315 PLC programmable controller and PROFIBUS communication bus send parameters and control words to the CB communication board of the inverter, and then control the start, stop, speed regulation, fault display, and fault reset of each motor.

4. Traction system: The traction system is equipped with a 3KW corona cooling roller motor and a 4KW traction motor. S7-315 PLC programmable controller and PROFIBUS communication bus send parameters and control words to the inverter CB communication board, and then control the start, stop, speed, fault display, and fault reset of the two motors.

5.Floating Roller Adjustment System: The floating roller adjustment system is equipped with a 3KW contact roller motor, a precision pressure regulating valve, a rotary potentiometer, and two low-friction cylinders. S7-315 PLC programmable controller and PROFIBUS communication bus to send parameters and control words to the inverter CB communication board to control the motor start, stop, speed, fault display and fault reset and other operations.

6. Coiling System: The coiling system is equipped with two 5.5KW coiling motors, one 2.2KW inverter motor and one 0.75KW swing motor. The S7-315 PLC programmable controller and PROFIBUS communication bus send parameters and control words to the CB communication board of the inverter, and then control the start, stop, speed regulation, fault display, and fault reset of each motor.

Source: China Packaging News