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 Coating products: there is no obvious abnormality before the film is processed, and wrinkling is obvious after the oven is cooled after processing.
1,Cause analysis:
(1) Slitting small rolls and insufficient stress release;
(2) There is a large difference in the ratio of vertical and horizontal shrinkage of the films, leading to the crystallization rate or non-uniform secondary shrinkage after high temperature;
(3) Uneven thickness of the film itself, coating film on the substrate level requirements of higher, coating after completion of the film defects more obvious;
(4) The local deviation of the uneven crystallinity of the film after TDO (horizontal pull) shaping and cooling is large.
2. Preventive Measures:
(1) Adjust the appropriate slitting and rewinding pressure;
(2) Adjust the process parameters so that the fim's vertical and horizontal shrinkage ratio is in an appropriate range;
(3) The production control film surface is smoother and the average deviation is smaller;
(4) Adjust TDO (horizontal pulI) temperature to make crystallization faster and more uniform. Defective film surface printing and aluminum plating
1. Cause analysis:
(1) The non-uniform wetting tension of corona does not meet the requirements;
(2) Oil oil is thrown to the film surface during film drawing production, causing film surface pollution;
(3) Problems occurred in the process of customer processing
2. Preventive Measures:
(1) Adjust the electrode spacing of corona generator to make corona uniform, and increase the power to make the wetting tension meet the customer's demand, greater than 56 Dyne;
(2) The equipment shall be flled with bearing lubricating oil in appropriate amount and promptly clean up the spilled grease;Avoid throwing to the film surface during production operation
(3) Solve this problem through customer analysis in use
After slitting and packing, the paper tube and film roll delamination slip out when the film roll
is transported for a period of time.
1. Cause analysis:
(1) The water content of the paper tube core is not qualified. In a high temperature
environment, the water evaporates and the paper tube core shrinks, leading to a smaller
outer diameter.
(2) The starting speed was too fast, and the tension could not keep up with the pressure,
leading to the loose winding at the beginning.
2. Preventive measures
(1) Incoming material inspection shall strictly check the water content test results, and the
warehouse shall have temperature and humidity control.
(2) The winding speed of the first 100 meters is controlled at 50~80min/m.