Pinhole resistance strength of functional design of flexible packaging
Pinhole resistance is an important property of packaging materials, especially liquid packaging pouch and Modified Atmosphere Packaging. In the conveying process, due to the impact, vibration easy to produce pinhole, will cause a great loss. Especially when the packaging contents have hard sharp corners (such as bones, bean vermicelli, peanuts, etc.) or the sharp edges of other packaging materials may Pierce the packaging bag, the pinhole puncture resistance of the packaging bag should be considered. At the same time, the hard packaging bags take round corners, which can effectively reduce the probability of the bag surface being punctured by the edges and corners of the adjacent packaging bags.
The vibration test of packaging can only simulate the damage caused by transportation and vibration in the flow process, but can not really simulate the pinhole test. Jacking method, instrument method and impact test method are three kinds of commonly used pinhole strength test methods, but the meanings of the three methods are different.
To measure the puncture resistance of packaging materials, there is not only the size of puncture force, but also an index of puncture energy, which is the comprehensive result of puncture force and the shape variables produced by packaging materials during puncture. The puncture energy is more closely related to the puncture resistance at high speed, while the puncture force and the creep of the material are related to the puncture resistance at relative rest.
