This is the reason why there are problems such as uneven end faces and runaway rolls in blown film winding.
Release time:
2020-08-14
In terms of packaging efficiency and product hygiene control, flexible packaging products will increasingly be roll films. At the same time, on the flexible packaging production line, the semi-finished products of the process are mostly in the form of rolls. Here, combined with some problems encountered in practice, talk about the problem of winding.
In terms of packaging efficiency and product hygiene control, flexible packaging products will increasingly be roll films. At the same time, on the flexible packaging production line, the semi-finished products of the process are mostly in the form of rolls.
Here, combined with some problems encountered in practice, talk about the problem of winding.
Control mode of winding tension
1. Constant tension control mode
The tension remains constant throughout the process. When the tension setting value is small, there will be uneven winding. When the tension setting value is large, a large shrinkage force is formed due to the residual tension of each layer of film after winding, leaving transverse dents on the film surface, forming a "chrysanthemum petal" roll end face.
2. Equal torque tension control mode
The moment remains constant during rewinding. The tension does not decrease as the diameter of the film roll increases. This approach, while an improvement over the constant tension control approach, is still not very good.
Manifests of winding problems
1. When rewinding, it is not easy to control, which is manifested as incomplete rewinding and even having to rewind small reels, resulting in waste of materials, working hours, manpower, etc.
Although such a problem is serious, it can be found immediately that it is basically within the scope of correction and generally does not cause great losses.
2. Problems that can only be found in the post-process.
In general, the automatic packaging cursor spacing is within the control range during the production of the previous process. However, after a certain period of time under certain conditions, the automatic packaging cursor spacing is abnormal.
From the operational point of view, we found that the larger the roll diameter, the more obvious the difference between the outermost and near the core of the roll.
Wrap problem generation and root cause
1. In terms of flexible packaging production operations, there is a lack of strong technical support for winding control.
If the operator is not clear about the influence factors of the winding tension control of the corresponding materials, he can only explore, which will lead to the difficulty of stable performance of the winding quality.
2. In terms of flexible packaging management, there is a lack of systematic technical support for winding. Generally speaking, a product often corresponds to a variety of materials and multiple machines.
Suggestions on the control of winding problems
1. The study and training of winding theory should be able to follow the introduction of new equipment.
2. For the development of some new products, it should include the study of winding quality control and form the corresponding documents.
3. The operator should have daily inspection and maintenance of the equipment to minimize the probability of abnormal hardware and software, avoid the waste of semi-finished products and the increase of material cost.
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