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 typically 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 pyramid-shaped protrusions per cm length. The projections 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. After understanding these contents, we can get the following information for the performance of the above quality problems.
(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 (usually the actual temperature of the heat sealing knife roller is significantly 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 printing 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.
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