Performance Testing of Biodegradable Packaging Bags

First, visual and dimensional inspections are required. This involves checking the surface of the packaging bag for flatness and inspecting for obvious defects such as damage, air bubbles, impurities, or creases, while also measuring the bag's length, width, and thickness. For a given batch of products, it is also necessary to verify the uniformity of the thickness across different areas; significant dimensional deviations or inconsistent film thickness can compromise the bag's performance.

 

Mechanical properties-including tensile strength, elongation at break, and tear strength-are critical aspects of testing for degradable packaging bags. Testing typically involves using samples of specific dimensions cut from the bags or film; tensile testing equipment is used to apply gradually increasing force while the material's behavior under tension is observed. These data reveal the bag's strength and toughness, helping to determine its susceptibility to rupture during loading, handling, and transport. For products such as shopping bags and food service packaging that must bear weight, load-bearing capacity and seal strength are also key areas of inspection.

 

Degradable packaging bags must also undergo testing for water resistance, heat resistance, and sealing integrity. Bags intended for food or catering products require adequate water and oil resistance to prevent leakage during use. For bags that come into contact with hot food, the material must be tested to ensure it does not easily soften or deform at elevated temperatures. Additionally, seal integrity tests verify the security of the bag opening, preventing issues like splitting or air leakage during transport. Depending on the intended use, further tests for properties such as abrasion resistance and puncture resistance may also be conducted.

 

Degradation performance is another crucial testing area that distinguishes degradable packaging bags from conventional plastic bags. Testing involves subjecting the material to degradation trials under specified temperature, humidity, and environmental conditions-based on the material type and relevant standards-and observing changes over a set period. It is important to note that degradation rates are influenced by environmental conditions; not all products degrade rapidly in a natural environment. Therefore, performance evaluations should consider both functional utility and degradation characteristics, assessing the product against relevant standards to determine if it meets the necessary requirements.