There is a problem with the sealing of the drug packaging bag. What should I do?
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At present, the composite film for inner packaging bags of most medicines is basically based on aluminum foil composite materials. However, the sealing of the drug packaging bag made of aluminum foil composite material often causes delamination, puncture, cracking, melting of the ink layer, uneven quality of the unevenness, and causes some disputes between the pharmaceutical enterprises and the pharmaceutical packaging materials enterprises. . Below, the author analyzes the common sealing quality problems of pharmaceutical packaging bags for the reference of the industry.
Problem analysis
In automatic packaging machines, heat sealing knives for transverse sealing are generally designed to be "straight", and heat sealing knives for longitudinal sealing are typically designed as "roller". Among them, the roller type longitudinal heat sealing knife is usually composed of two rollers, and the surface of the roller is distributed with a quadrangular pyramid shape or a quadrangular prism shape, and there are 12 to 17 quadrangular pyramid or quadrangular prismatic protrusions per cm length. The protrusions are staggered on the two rollers, that is, the "high point" of the protrusion on one roller corresponds to the "low point" of the protrusion on the other roller. With this in mind, we can get the following information for the performance of the above quality issues.
(1) When the delamination problem occurs at the sealing position of the drug packaging bag, the shape of the heat-sealing knife roller of the automatic packaging machine used is generally a quadrangular pyramid shape, and the number of quadrangular pyramid patterns is low, and the quadrangular pyramidal projection The height of the object is high, the heat sealing pressure between the rollers is large, and the roller temperature is high (the actual temperature of the heat sealing knife roller is obviously higher than the temperature value set on the temperature controller).
(2) When the height of the quadrangular pyramidal protrusion on the roller is high (ie, sharp), or the heat sealing pressure between the rollers is large, and the roller temperature is high, the composite film is easily pierced.
(3) When the roller temperature is high, the printed ink layer or even the surface film may be "melted".
(4) When the external force is removed (that is, the automatic packaging process ends), the composite film that has undergone significant deformation must undergo some degree of "rebound". The degree of "rebound" of the composite film and the height of the quadrangular pyramidal protrusion on the roller, the temperature of the roller, the heat sealing pressure between the rollers, the running speed of the automatic packaging machine, and the material of the composite film surface film (PET, PA or OPP) The total thickness of the composite film and the melting point (or softening point) of the heat seal layer film are related.
Solution
1. Permanent measure
(1) First, changing the relevant parameters of the heat seal knife roller pattern can effectively reduce the deformation degree of the composite film surface film during the automatic packaging process. In this measure, it can be considered from two aspects: 1 reducing the actual height of each quadrangular pyramidal protrusion without changing the shape of the quadrangular pyramid pattern, such as a quadrangular pyramidal convexity per cm length The number of the objects is increased from 12 to 20 or more; 2, the shape of the protrusions is changed from a quadrangular pyramid to a quadrangular pyramid shape without adjusting the number of quadrangular pyramidal projections per unit length.
(2) The operator should regularly check and correct the difference between the actual temperature of the surface of the heat-sealing knife and the displayed value on the relevant temperature controller, and fully understand the condition of the automatic packaging machine, so that you can know the number, especially to avoid heat sealing. The actual temperature of the surface of the knife roller is significantly higher than the value displayed by the temperature controller.
2. Temporary measures
According to the actual condition of the pharmaceutical packaging bag, the operating parameters of the automatic packaging machine, such as sealing temperature, sealing pressure, running speed, etc., are appropriately adjusted.
When the pharmaceutical packaging materials enterprises encountered quality complaints from pharmaceutical companies, the measures taken were to come to the packaging workshop of the pharmaceutical company to honing the heat-sealing cutter rollers on the automatic packaging machine with metal crucibles. The pattern is twisted into a quadrangular shape, which is hoped to solve the quality problem. However, some pharmaceutical companies do not allow operators of pharmaceutical packaging companies to make any adjustments to their automatic packaging machines. Moreover, in a plurality of automatic packaging machines of a pharmaceutical company, the difference between the actual temperature of the heat-sealed knife roller on different equipments and the display value of the temperature controller is positively biased (higher than the temperature controller display value), and some are negative deviations (below The temperature controller display value) can not be solved by the simple honing method of metal.
In addition, operators of automatic packaging machines in pharmaceutical companies can sometimes find the optimal combination of parameters to meet the requirements of use by constantly adjusting the parameters of the equipment to meet the quality and output requirements of pharmaceutical companies. Therefore, how to seek the common interests of pharmaceutical companies and pharmaceutical packaging materials companies requires mutual understanding and mutual support between pharmaceutical companies and pharmaceutical packaging materials companies, as well as pharmaceutical companies, pharmaceutical packaging materials companies, automatic packaging machine manufacturers, etc. Join hands to find the best solution.