If you want to ensure the stable quality of the composite membrane slitting, these points must be noted!
We must pay attention to this process of slitting, and we must not take it lightly. This article combines the composite BOPP / LDPE composite film, the quality problems that occur in the slitting production process and the related problems of the slitter, to analyze. In order to enable the majority of composite film manufacturers to solve a series of quality problems in future slitting production, to ensure the stable quality of composite film slitting.
Purpose of cutting
1. According to user requirements, provide accurate specifications.
2. When slitting and unwinding, the large roll composite film compounded during the extrusion and compounding of the previous process can be re-examined to see if there are quality problems.
3. It can correct the wrong layer of the composite film or cut off part of the printing and composite defects, and improve the grade rate of the product.
4. Can make the finished product get a good winding state.
Precautions during slitting
1. Control the cutting speed
When entering normal production, the speed of the slitter should strictly follow the process requirements. Too high will also affect the cutting quality. Therefore, by controlling the cutting speed, the quality required for cutting can be obtained. Because in the production, some operators artificially increase the cutting speed in order to increase the output and improve their own economic benefits. This will make the film prone to longitudinal stripes and staggered quality problems under high-speed operation.
2. Choose the appropriate slitting process according to the equipment and film performance
In normal production, it is necessary to use appropriate slitting technology for production according to equipment performance, film internal performance and different film specifications. Because the various thin film process parameters, identification methods, and values ​​are different, the process must be carefully adjusted for each product.
3. Pay attention to the correct choice of work station
In production, the frequency of use of each station of the slitting machine is different, so the degree of wear is also different. Therefore, there will be a certain difference in performance. For example, for slitting products in better condition, there are fewer longitudinal stripes. Conversely, there are more longitudinal stripes. Therefore, each operator must pay attention to the correct selection of the station, give full play to the best condition of the equipment, grasp the on-site use situation, continuously sum up experience, and find the method of using the best characteristics of the equipment.
4. Keep the film clean
In addition, it is also important to note that during the slitting process, each roll of film is reopened and re-rolled, which creates conditions for the entry of external foreign bodies, and since the film products themselves are mainly used for food and pharmaceutical packaging Therefore, the sanitation requirements are very strict, so it is necessary to ensure the cleanliness of each roll of film.
Main points of slitting production control
1. The cutting material is in accordance with the process.
2. The release direction of the slit material roll material is consistent with the process sheet.
3. The position of the cutting knife of the divided product is in accordance with the requirements of the craft bill or sample.
4. The width of the slitting product is in accordance with the technological requirements.
5. The end face of the slitted roll is flush, without wrinkles and ribs.
6. Printing, compound quality (overprint, lack of printing, trailing, knife line, dirty ink, bubble (spot, grain) dots, wrinkles, lack of glue line, dirty type) are all eliminated.
7. The cut materials are hygienic, free of oil stains, paper scraps, and diaphragms.
8. The photoelectric detection object is selected correctly, the photoelectric detection head has high sensitivity, and the correction motor moves quickly.
9. The tension setting for unwinding and winding is appropriate, and there is no phenomenon of running and stretching or wrinkling.
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