The shelf life of PVC bags at normal temperature is usually 1 to 2 years, but the specific duration is affected by multiple factors such as material formula, processing technology, storage environment and packaging purpose. The following is the specific analysis:
Under ideal storage conditions (temperature 15-25℃, humidity ≤60%, away from light and moisture), ordinary PVC bags without special stabilizers usually experience problems such as bag brittleness and decreased light transmittance within one year due to aging mechanisms such as plasticizer migration and molecular chain breakage. If a high anti-aging formula (such as adding ultraviolet absorbers and heat stabilizers) is adopted and stored in a constant temperature and humidity warehouse, the shelf life can be extended to about two years. For example, after being stored in a cool and dry warehouse for two years, the tensile strength of industrial-grade PVC flood control sandbags can still maintain more than 85% of the initial value. Food-grade PVC food storage bags, due to contact with grease or high temperatures (such as heating in a microwave oven), will accelerate the release of plasticizers, and their actual service life may be shortened to 6 to 8 months.
It should be noted that if the storage environment exceeds the following thresholds, the shelf life will be significantly shortened:
When the temperature remains above 30℃ for a long time, the evaporation rate of the plasticizer increases, causing the bag to harden and crack.
Light exposure: If exposed to ultraviolet rays for more than 72 hours, the PVC molecular chains will undergo photolysis reactions, causing the bag to turn yellow and become more brittle.
Humidity: When the environmental humidity exceeds 80%, moisture will accelerate the degradation of the edge banding hot melt adhesive, causing delamination.
It is suggested to extend the storage period through the following measures:
Packaging pretreatment: Before storage, the surface is treated with anti-static spray to prevent dust adhesion and scratches.
Environmental control: Use intelligent shelves with temperature and humidity monitoring to automatically adjust storage conditions;
Regular inspection: Sample and test the tensile strength and elongation at break of the bag body every quarter to eliminate products with deteriorated performance in advance.
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