The service life of sealing film mainly depends on the following three factors: 

1. Storage conditions 

Unused sealing film can be stored for 2-3 years in a dry, dark, and room temperature (below 25 ℃) environment. High temperature (over 40 ℃) or humid environment will accelerate the aging of its heat sealing coating. 

2. Encapsulated usage environment 

Encapsulation of ordinary dry food (such as milk powder, coffee powder): Consistent with the shelf life of the food 

Encapsulation of acidic, alcoholic, or oily products: Sealing films made of corrosion-resistant materials can last for

6-12 months, while ordinary materials may corrode for 3-6 months 

High temperature and high humidity environments can shorten the service life by about 30-50% 

3. Material differences 

Ordinary PE heat sealing layer: suitable for neutral contents 

Surlyn coating: more resistant to chemical corrosion, with a lifespan extension of approximately 50% 

Aluminum foil thickness: 40 μ m improves barrier properties by about 20% compared to 30 μ m 

Regarding the actual situation of repeated use 

The sealing film is designed for one-time use and cannot be effectively reused 

1. Physical structural damage 

When tearing off the opening film for the first time, the aluminum foil layer will produce irreparable cracks, increase the oxygen permeability by more than 100 times, and lose its barrier function. 

2. Sealing function failure 

After one heating and cooling process, the chemical structure of the heat sealing layer has changed. The sealing strength of secondary heating decreases by 70-90%, and the sealing performance cannot be guaranteed. 

3. Health and safety issues 

The used sealing film may contain 0.1-0.5ml of residual content, becoming a source of microbial contamination, and the total bacterial count may exceed the standard by more than 100 times. 

Maintenance Recommendations 

Select the sealing film material that matches the content 

Ensure that the temperature and pressure parameters of the sealing machine are correct 

The storage environment temperature should be controlled between 15-25 ℃, and the humidity should be below 60% 

Purchase according to actual usage and avoid long-term storage 

In summary, the sealing film can remain effective for 2-3 years under suitable conditions, but the actual lifespan after packaging depends on the properties of the contents. The sealing film does not have the technical conditions for repeated use, and forced secondary use can lead to sealing failure and hygiene risks. 

The aluminum foil sealing film produced by Leadtra Packaging has many advantages such as strong sealing barrier, good tear off effect, bright colors, exquisite appearance, green environmental protection, high safety, strict testing, and stable quality. The effect is very reliable. If you are interested in or have any questions about us, please feel free to call us for consultation.