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Why are plastic packaging bags damaged?

by:Supouches Packaging     2022-09-07
The damage of plastic packaging bags during production, transportation and storage is a common quality problem for enterprises. Professional flexible packaging manufacturers have specially sorted out the following situations that are most likely to be damaged: 1. Damage in the automatic packaging process: during automatic packaging , the contents of the filling have a violent impact on the bottom of the bag, and if the bottom of the bag cannot withstand the impact force, the bottom will crack. ​2. Damage during transportation and product accumulation: The flexible packaging bag cannot withstand the increase in internal pressure caused by product stacking, friction in the transportation process, etc., and the bag ruptures. 3. Damage caused by the vacuuming process of the packaging bag: the thickness of the packaging bag is too thin, the packaging bag shrinks when vacuuming, the contents are hard objects, needle corners or hard objects (dirt) in the vacuuming machine puncture the packaging bag and cause damage. 4. When the high temperature cooking bag is evacuated or sterilized at high temperature and high pressure, it will be damaged due to the lack of pressure resistance and high temperature resistance of the material. 5. Frozen packaging bags become hard and brittle due to the low temperature, and the packaging bags are ruptured due to poor freeze resistance and puncture resistance. Causes of damage 1. The reason for the damage of the packaging bag during the automatic packaging process Generally, the heat sealing strength refers to the bonding strength after the two films are glued together by heat sealing and thoroughly cooled. However, in the automatic packaging production line, the two-layer packaging material does not obtain sufficient cooling time, so the heat sealing strength of the packaging material is not suitable for use here to judge the heat sealing function of the material. At this time, the thermal adhesive force, that is, the peeling force when the heat-sealing part of the material is not cooled, should be used as the basis for the selection of heat-sealing materials, so as to meet the heat-sealing strength requirements of the material during filling. There is an optimum temperature point to reach the best thermal adhesive force of the film material, and when the heat sealing temperature crosses this temperature point, the thermal adhesive force will show a decreasing trend. In the filling production line, the heat sealing of the flexible packaging bag is almost synchronized with the filling of the content, so when the content is filled, the heat sealing part at the bottom of the bag is not completely cooled, and the impact force it can withstand will also be large. discount. Regarding the impact force at the bottom of the flexible packaging bag when the contents are filled, the thermal adhesion tensile tester can be used to draw the thermal adhesion curve by scheduling the heat sealing temperature, heat sealing pressure and heat sealing time, and select the best combination of heat sealing parameters for production line. 2. Reasons for bag breakage in the process of storage and transportation. Items packaged in flexible packaging bags will increase the gas pressure in the bag due to the stacking of items during storage and transportation, which can then cause the flexible packaging bags to be split. Because the location where the split occurs is mostly in the heat sealing location between the materials, that is, the thinnest heat seal of the flexible packaging bag, the bag breakage can be prevented by detecting the heat sealing strength of the heat sealing edge of the package, then replacing the material or adjusting the heat sealing process parameters. . The heat seal strength of the material can be roughly divided into tensile heat seal strength and swelling heat seal strength according to the testing method. The tensile heat sealing strength that can be detected by the tensile machine is the ability of the packaging material to resist separation under the condition that the force direction is the same and the force value is uniform. It is especially suitable for evaluating the opening of flexible packaging bags, but not suitable for To solve the problem of broken bags of flexible packaging bags, because the direction and size of the pressure in the bags that cause the broken bags are not recognized, and the materials near the heat seal may be deformed due to partial pressure, resulting in pressure damage of the flexible packaging bags. The detection of swelling heat seal strength requires the use of a leak and seal strength tester, which needs to be pressurized into the flexible packaging bag, and at the same time can detect the worst and thinnest position in the entire package (not only limited to the heat seal part). Since the swelling heat seal strength does not represent the uniform strength of the heat seal, there is little correlation between the swelling heat seal strength and the tensile heat seal strength. The expansion heat seal strength is related to the size, geometry and material of the flexible packaging bag. 3. The reasons for the damage of vacuumed food packaging are mainly due to two aspects of food vacuum packaging design and external vacuum packaging materials: (1) In terms of food vacuum packaging design, if the net content or volume of the contents exceeds the tolerance design of the flexible packaging materials used, In the process of transportation or sale, if a little external force is applied, there will be problems of bag breakage and cracking. Generally used as the heat sealing layer of vacuum packaging bags, the material thickness shall not be less than 50um thick. (2) The quality problems of food vacuum packaging materials lead to the problem of seal cracking in the product packaging, which generally converge in the following aspects: (A) Physical and mechanical functions of food packaging——Such as breaking force and elongation at cracking, puncture resistance, pendulum impact resistance, peeling strength, etc., can be summed up to determine whether the physical and mechanical properties of the packaging bag, such as resistance, puncture resistance, impact resistance, are suitable for packaging, storage stacking and shipping requirements. (It is related to the contents, the size of the packaging bag, the transportation journey and the packaging method) (B) The airtightness of the food packaging——For example, the burst pressure test can identify the location where the bag is broken and the location with weak mechanical strength.
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