The purpose of the cutting, the process, how much do you master?
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We must pay attention to the process of cutting, and we must never take it lightly. This paper summarizes the purpose of the slitting, the process flow, etc., so that the majority of composite membrane manufacturers can solve a series of quality problems in the future slitting production to ensure the stable quality of the composite membrane slitting.
First, the purpose of cutting
1. Provide accurate specifications according to user requirements.
2. When slitting and unwinding, the composite large-volume composite film can be re-inspected during the extrusion process of the entire previous process to see if there is any quality problem.
3, can correct the wrong layer of the composite film or cut off some of the printing and compounding defects, improve the grade rate of the product.
4, can make the finished product get a good winding state.
Second, the film slitting process
Ready to start, first check the appearance of the large film roll of the previous process, printing, and compounding, and check the hardness and appearance flatness of the large film roll to see if it can meet the requirements of cutting. Then, fully understand the performance of the slitting equipment that is about to run, and check the main operating parts and electrical control parts of the equipment. At this time, a large film roll is made, the blade is adjusted according to the specifications required by the user, and the production is started according to the normal production process.
The normal operation of the slitter is the basis for ensuring the quality of production. Because each slitting machine often runs at high speed for a long time, the running accuracy of some important key components will decrease. This is difficult to ensure the running accuracy of cutting small-sized film rolls. Because the composite film is a polymer product, its thickness is relatively thin, and it is easily damaged during processing. Therefore, when the running accuracy at the time of slitting is insufficient, quality problems such as vertical streaks are likely to occur on the film. To this end, after years of observation and research, we have confirmed that the vertical stripes generated in the slitting are the main quality problems in the slitting and must be solved.
When entering normal production, the speed of the slitter should be strictly in accordance with the process requirements. Too high will also affect the quality of the cut. Therefore, by controlling the slitting speed, the quality required for slitting can be obtained. Because, in the production, some operators in order to increase production, improve their own economic benefits, artificially increase the slitting speed, which will make the film at high speed, prone to vertical streaking and staggered quality problems. Therefore, in normal production, we must use the appropriate slitting process to produce according to the performance of the equipment and the intrinsic properties of the film and the different specifications of the film.
Because the process parameters, identification methods, and values of various cut films are different, the process must be carefully adjusted for each product. In the production, the frequency of each station of the slitting machine is different, so the degree of wear is also different. Therefore, there will be some differences in performance. For example, for a station with a better condition, the longitudinal stripes are less.
On the contrary, there are more vertical stripes. Therefore, each operator must pay attention to the correct choice of the workstation, play the best state of the equipment, grasp the use of the site, constantly sum up the experience, find the use of the best features of the equipment.
In addition, it should be noted that in the process of slitting, each film is re-opened and re-rolled, which creates conditions for foreign matter to enter, and since the film product itself is mainly used for food and drug packaging, Therefore, the hygiene requirements are very strict, so it is necessary to ensure the cleaning of each film.