Stretch Film Production Machine

Stretch Film Production Machine

Rewinding Machine operating procedures - Unwinding paper core
(1.) Post operator
1. First check the cutting distance of the measuring cutter, which is consistent with the specifications required by the process standard.
2. Before placing the paper core, first check whether the paper core used meets the requirements for use:
A. Is the size of the specification the same as the roll paper size?
B. Is the inner diameter and outer diameter of the paper core acceptable (the thickness is consistent).
C. Does the strength of the paper core meet the requirements?
D. Whether the port is layered or burred.
E. Can be put on the machine after passing the inspection and passing the test.
3. Signal the main operation: Start the ejector pin pump button and insert the paper core onto the ejector cone.
4. Shake the two thimble handles to the left to push the core.
5. Align the edge of the paper core port (the difference between left and right cannot exceed one millimeter).

(2) Main operation
1. Review again whether the paper cores on the board meet the requirements.
2. Review whether the thimble is inserted into the lock (avoid the end of the paper roll is not aligned)
3. Check the sharpness of the upper and lower round knives, the depth of the occlusion and the angle to ensure the quality of the trimming.

Stretch Film Production Machine

Rewinding machine unwinding tension control system design ---

       This paper presents the design scheme of the rewinding electrical control system of the main drive for the DC motor, including the overall control scheme of the system, the control of the web unwinding tension, the control and establishment of the key quantity mathematical model and the selection of the main drive motor. type.
       Web tension control is one of the most important factors in ensuring the shape of the paper roll. The most important function of the web tension is to flatten the paper web, while the stable web tension will also avoid lateral deflection of the web. In the rewinder, the web tension is generated by the eject roller drive motor operating in the feedback brake state. The magnitude of the web tension, or the stability of the tension, lies in the control of the exit roller motor. For the tension control scheme, the control systems of domestic rewinders can be roughly divided into two categories: direct tension control scheme and indirect tension control scheme. From the control scheme, the so-called direct tension scheme uses the measured tension as the feedback signal. Compared with the given signal, the tension adjuster is used to adjust the tension. The advantage of this scheme is that the control structure is simple and the control response is rapid, but it is difficult to balance the rapidity of control response and the stability of control. The so-called indirect tension control scheme is to analyze the cause of the tension change, and compensate the main disturbance amount. If several disturbances can be controlled at the same time, good results can be achieved. Taken together, direct tension control should be combined with an indirect tension control scheme to take advantage of its fast response while avoiding other deficiencies.
       The selection of the main drive of the rewinding machine should mainly consider whether the three main aspects of the speed regulation range, power and torque of the motor meet the requirements. Of course, the cost and the coordination with the gearbox should be considered comprehensively to achieve the best cost performance. The paper gives an example of the hardware selection of the system for specific tension control requirements.

Stretch Film Production Machine

Automatic rewinding machine speed ratio adjustment method ---

2. Adjust the paper-pressing gap of the platen roller so that the paper web can be smoothly conveyed between the paper feeding belt and the winding roller. The rear platen roller is the intermediate link of the paper web conveying process. If the adjusted gap is too small, the paper web is easy to wrinkle and sag. When the gap is too large, the three layers of paper are not combined together to facilitate delamination and fault, which affects the speed of the paper feed and Rewind quality. When adjusting the paper-pressing roller, the paper-pressing gap should be gradually increased from small to large, so that the paper web can be locked without sag and not drooping.

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