What should I do if the food packaging bag is swollen, burst, wrinkled, or leaking?

With the continuous improvement of living standards and the acceleration of the pace of life, the demand for fast, safe, and convenient packaging is becoming increasingly urgent. Therefore, the demand for retort pouches is on the rise, and higher requirements are also being placed on the performance and functions of retort pouches. Although retort pouches have been developed for many years at home and abroad, there are still many common quality problems in actual use, some of which occur during the packaging material production process, and others occur during use due to insufficient understanding of retort pouches.

Here, Shunxingyuan editor summarizes the retort pouches Four common problems and five effective detection methods, aiming to help enterprises better choose and use retort pouches.

1. Pouch swelling

The main reasons include contamination of the sealing area causing false sealing, allowing oxygen to enter the bag, thus causing bacterial growth and swelling; or incomplete sealing due to the sealing tunnel at the sealing area, causing the contents to deteriorate and ferment and swell; or the selection of raw materials with poor barrier properties, allowing oxygen to enter, causing the contents to deteriorate and swell; or the packaging bag is punctured or rubbed by the bone spurs of the contents or external sharp objects during production or transportation, which will also cause contamination of the contents and deterioration and swelling.

2. Pouch bursting

Due to improper back pressure control during steaming, the internal pressure of the bag is much greater than the environmental pressure inside the retort, which can cause swelling and even bursting of the bag. If the contents are liquid, severe bumps during production and transportation can cause excessive impact of the liquid inside the bag on the edges of the bag, possibly leading to bag breakage. Or, due to severe swelling, the edges cannot withstand the pressure and burst.

3. Wrinkles on the bag surface after retort

Due to improper selection of raw materials, the sensitivity of different components of the composite material to the temperature during steaming is significantly different, resulting in different deformation amounts and wrinkles on the bag surface; in addition, due to poor back pressure control, excessive back pressure causes permanent deformation of the material; it is also possible that the vacuum degree is too high during vacuum sealing, causing material deformation.

4. Heat-sealed edge cracking

Possible reasons for this phenomenon include excessive sealing temperature and pressure during the bag making process, which damages the material and reduces the strength of the seal; or the presence of heat-sealing bubbles at the seal, creating local weak points in the heat seal that crack under external forces; improper selection of adhesives or inks, resulting in reduced composite strength under high temperature and high pressure during heat sealing or during retort, resulting in composite delamination, and ultimately the sealing strength is only the strength of the heat-sealing layer material, which will crack when it cannot withstand internal and external forces.

In order to better ensure food safety for retort pouches, Shunxingyuan Packaging introduces here Five packaging testing methods:

1. Packaging Sealability Test

The sealing performance of the material is tested by methods such as inflation with compressed air and underwater extrusion. Through testing, the sealing performance of the packaging can be effectively compared and evaluated, providing a basis for determining relevant production technical indicators.

2. Packaging Pressure Resistance and Drop Resistance Test

By testing the pressure resistance and drop resistance of retort packaging, The rupture resistance and proportion during the turnover process can be controlled. Because the conditions during the turnover process vary greatly, pressure resistance tests are performed on individual packages and drop resistance tests are performed on entire boxes of products, and multiple tests are performed in different directions to comprehensively analyze the pressure resistance and drop resistance performance of the packaging products, solving problems caused by packaging damage during transportation or transfer.

3. Mechanical Strength Test of Retort Packaging

The mechanical strength of the packaging material includes the composite peel strength, heat seal strength, tensile strength, etc. If the test indicators do not meet the standards, it is easy to crack or break during packaging and transportation. It can be tested and judged whether it is qualified or not by using a universal tensile testing machine according to relevant national and industry standards and standard methods.

4. Barrier Property Test

Retort products generally contain highly nutritious contents such as meat products, which are easily oxidized and deteriorated. Even within the shelf life, their taste varies with the date. Therefore, in order to ensure their nutrition, flavor, and quality, barrier materials must be used, and therefore, strict oxygen and moisture permeability tests must be performed on the packaging materials.

5. Residual Solvent Test

Because printing and lamination are two very important processes in retort production, and the use of solvents is necessary during printing and lamination, Solvents are high-molecular chemical materials with a certain irritating odor and harm to the human body. Foreign laws and regulations have very strict control indicators for some solvents such as toluene butanone. Therefore, solvent residues must be tested during the production of printing semi-finished products, composite semi-finished products, and finished products to ensure that the products are healthy and safe.

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