Why do vacuum packaging bags swell?

Vacuum packaging bag is a packaging method that involves adding products into an airtight packaging bag, removing the air inside the bag, and achieving a predetermined vacuum level in the sealed bag. It can achieve the purpose of compressing the volume of items, preventing moisture and water, blocking air, and effectively extending the shelf life of packaged products. If the vacuum packaging bag swells, it loses its vacuum pumping function. So, why do vacuum packaging bags swell?
Why do vacuum packaging bags swell? Jinde Packaging explained that if this phenomenon occurs in all products packaged in the same batch, it may be due to quality issues with the selected vacuum packaging bags, which have poor barrier properties. Or it may be due to inadequate pre processing, resulting in microorganisms still reproducing and playing a role after packaging, as detailed below.
1. Due to the inherent reasons of food, such as inadequate pre-treatment and insufficient drying of dried food, microorganisms can multiply in environments with trace amounts of oxygen or high humidity, which can easily lead to mold, mildew, and bag swelling problems.
2. The quality of vacuum packaging bags is not up to standard, which can allow oxygen or water vapor to enter the interior of the finished product packaging, promote microbial growth, and cause food to become moldy, moldy, and swollen. The quality problems that are prone to occur in packaging generally include the following aspects:
Poor barrier properties: For example, the oxygen and water barrier properties of packaging materials are poor, causing oxygen and water vapor to slowly penetrate into the packaging during long-term storage of the finished product.
Poor sealing: Poor sealing caused by poor heat sealing results in poor sealing at the sealing point, causing external air and moisture to enter the packaging from the heat sealing area.
Poor physical and mechanical properties: such as poor toughness of packaging materials, inability to withstand punctures from contents, or rubbing or squeezing during production and storage processes, resulting in pinholes, creases, or broken bags on the finished packaging during storage and transportation that are not detected in a timely manner, leading to food exposure to a large amount of oxygen, water vapor, and mold growth.
 
The above analysis of the reasons for vacuum packaging bag swelling is compiled by Jinde Packaging. Jinde Packaging kindly reminds that in order to prevent unnecessary losses caused by vacuum packaging bag swelling, it is recommended to visit a reputable manufacturer and choose a vacuum packaging bag with stable quality when purchasing; Next, strict operation should be carried out during vacuum packaging, and disinfection treatment should be done well. During sealing treatment, the temperature should be suitable, the pressure should be moderate, and there should be no residue mixed in the sealing area. For more knowledge about vacuum packaging bags, please follow the Jinde Packaging website, or feel free to consult by phone at 15902743510