Cause Analysis of Packaging Pouch Breakage
The breakage of composite packaging pouches is a critical factor affecting their suitability. It is a fundamental requirement that determines whether the packaging meets quality standards. Several factors contribute to pouch breakage, with the key influences being outlined in the following aspects.
1. Peel Strength of Laminated Film
If the peel strength of the laminated film is too low, it may fail to meet the requirement of evenly distributing force across the multi-layer structure, resulting in poor force dispersion. This can lead to pouch breakage during drop tests. Additionally, for retort pouch, some adhesives with poor heat resistance—particularly in complex structures (such as BOPA15/AL7/CPP70)—can cause cracking at the sealing edges and delamination of the laminated film during the retorting process.
2. Pouch-making Process
If the temperature during pouch making is too high, it can cause a degradation of the heat-seal material at the sealing area. Excessive pressure can squeeze out the heat-seal material, reducing its strength and leading to pouch breakage when the pouch is dropped. Additionally, if the heat-seal edges are too sharp or have mechanical burrs, they can damage the pouch's sealing edge, causing breakage.
3. Materials
The material must be thick enough; otherwise, it may result in inadequate strength of the laminated film, leading to pouch breakage. Additionally, the amount of recycled material used must be carefully controlled, as its performance tends to degrade, and an excessive amount can reduce the film’s laminating strength, resulting in pouch breakage. During the production of PE films, adding LLDPE and mPE can enhance the strength and flexibility of PE, thereby reducing the risk of pouch breakage. For packaging used in low-temperature freezing environments, it is essential to select low-temperature-resistant materials (such as BOPA) to produce the laminated film; otherwise, the film may crack under freezing conditions.
4. Others
For heavy packaging or powdered items such as salt, laundry powder, etc., , the air inside the pouch should be evacuated after filling and before heat sealing. This reduces the stress on the pouch walls and ensures that the solid contents bear the load directly, thereby minimizing the risk of pouch breakage.
