◆ The tension of the material during winding and unwinding is constant, or the tension taper is controlled according to the requirements of material winding.
◆ Stable compounding speed
Laminating machines are essential equipment in the packaging and printing industry. They bond two or more layers of the same or different materials together using adhesives. Typically, one layer is the printed material, and the other is a material that has been treated with high temperature or sterilization for direct contact with the packaged goods. During the lamination process, proper tension control prevents longitudinal or transverse wrinkles and avoids plastic deformation of the material. The higher the laminating machine speed, the more crucial tension control becomes. Therefore, tension control is the core of the entire machine and a major factor affecting product quality. To obtain high-quality products, a fully functional tension control system is essential.
Weikeda tension control system has many years of application experience in multifunction machines. The system adopts a PLC + tension-dedicated servo architecture. The PLC is mainly responsible for the logic of the host machine and the interactive signal processing of the servo. The tension control is all controlled by the servo itself, which greatly simplifies the PLC program. In addition, all servos adopt a common DC bus mode, which saves energy significantly, thereby achieving an optimal control and cost-saving effect.
So how does Weikeda implement these process technologies on laminating machines? Let's take a look at the process flow and system architecture of Weikeda's tension control system on laminating machines.
The main function of the machine is tension control. The tension consists of the winding and unwinding tension and the process tension between coating and lamination. It is all closed-loop tension. Tension detection is achieved by tension swing rods and pressure sensors. The winding and unwinding require calculating the roll diameter and controlling the tension simultaneously. The tension sensor signal is directly connected to the servo. The servo adjusts the winding and unwinding shafts by using the difference between the tension fed back by the sensor and the set tension to achieve the purpose of tension adjustment. In order to achieve a better winding effect, tapered tension control is also used for winding, including linear tapered and segmented tapered.
The process tension between coating and lamination is relatively simple because there is no need to calculate the roll diameter, nor is there any tension change caused by changes in roll diameter. The tension sensor signal is directly connected to the coating servo, and the tension is adjusted by regulating the coating servo.
The tension setting is mainly based on the width and tensile strength of the material. For easily stretchable materials, the tension setting should be slightly smaller, otherwise the material will stretch and deform.
After adopting the control system provided by Weikeda, a coating laminating machine manufacturer in Guangzhou achieved perfect control over the speed synchronization and tension control of various parts of the solventless laminating machine, with a maximum lamination speed of 600 meters per minute. At the same time, the reliable closed-loop tension control ensured stable winding and unwinding tension and uniform coating, resulting in significant energy savings for the entire machine. The reliable operation of the control system also ensured the high quality and high grade of the products.
