Analysis of mechanical properties of flexible packaging and plastic film
Have reliable mechanical properties, is Flexible embodiment of the contents index substantially the best protection, if is not up to the mechanical properties of flexible packaging, it is prone to breakage during use, and thus there may be cases contents leak occurs. Therefore, flexible packaging companies will rigorously test their mechanical properties before leaving the factory, and will also evaluate the mechanical properties of almost all materials used in flexible packaging production. However, many companies are in the soft There are still some doubts about the choice of the project and the application of the standard when testing the performance of the packaging machinery . In this paper, the author systematically analyzes the mechanical properties of soft packaging and plastic film and its reference standards, hoping to bring some help to the industry.
Peel strength
The peel strength is also called composite strength or composite fastness. The adhesive strength between the composite film layer and the layer is mainly investigated. The main production methods of composite membranes are dry composite and solvent-free composite. The quality of adhesion between membranes directly affects the strength, barrier properties and service life of composite flexible packaging. If the bonding strength is too low, the flexible packaging produced by it is extremely easy to cause interlayer separation during use, thereby causing problems such as leakage.
The test standard for peel strength shall refer to GB/T 8808-1988 "Test method for peeling of soft composite plastic materials". The peeling strength test sample clamping diagram is shown in Figure 1. When the composite film layer can not be completely peeled off or the composite layer is broken, the peel strength is judged as qualified, but the premise needs to ensure that the tensile strength of the composite film meets the relevant standards. .
Heat seal strength
Heat seal strength is used to assess the quality of a film and film or film and other substrates (such as aluminum foil, etc.) when heat sealed. Flexible packaging is generally packaged by hot-press sealing. The tightness of the packaging is determined by the heat seal quality. During the storage and transportation of the product, if the heat-sealing strength of the flexible package is too low, the seal may be cracked and leakage may occur.
The test standard for heat seal strength test shall refer to QB/T 2358-1998 "Test method for heat sealing strength of plastic film packaging bags", which is applicable to the determination of heat seal strength of various plastic film packaging bags. Heat seal strength test sample shape and size as shown in Figure 2.
Right angle tear strength
Right angle tear strength is generally used to evaluate the tear resistance of a plastic film. It refers to applying a tensile load to a standard sample to tear the sample at a right angle and measuring the tearing force of the sample.
The right angle tear strength test is based on QB/T 1130-1991 "Test method for plastic right angle tear performance", which is applicable to films, sheets and other similar plastic materials. The schematic diagram of the right angle tear strength test sample is shown in Figure 3. If the sample is too thin, multiple pieces of sample can be used for the test, but the test results of the single piece and the laminated sample are not comparable.
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