Food packaging bag damaged? What is the reason?
Release time:2019-11-11
Damage to food packaging bags is an important aspect affecting product quality one, because Damage to food packaging bags not only affects the quality of product packaging, but also leads to phenomena such as food dampness, leakage, and spoilage, directly affecting the quality of the food in the bag. So where is the reason for the damage to the food packaging bag? Many factors may cause damage to the food packaging bag. Below, Shunxingyuan Packaging, a professional flexible packaging manufacturer, will analyze it for you.
1、 Heat sealing temperature has the most direct impact on heat sealing strength
The high and low melting temperatures of various materials directly determine the food packaging bag's minimum heat sealing temperature. During production, due to heat sealing pressure, bag making speed, and food packaging bag substrate thickness and other aspects, the actual heat sealing temperature used is often higher than the melting temperature of the heat sealing material. The smaller the heat sealing pressure, the higher the required heat sealing temperature; the faster the machine speed, the thicker the surface material of the bag, the higher the required heat sealing temperature.
If the heat sealing temperature is lower than the softening point of the heat sealing material, no matter how much pressure is increased or the heat sealing time is extended, it is impossible to truly seal the heat sealing layer. However, if the heat sealing temperature is too high, it is easy to damage the heat sealing material at the weld, causing extrusion and "root cutting", which greatly reduces the heat sealing strength and food packaging bag 's impact resistance.
2 The type, thickness, and quality of the heat sealing layer material have a decisive impact on the heat sealing strength
Generally food packaging commonly used heat sealing materials for bags include CPE, CPP, EVA, hot melt adhesive, and other ion-type resin co-extruded or co-blended modified films. The thickness of the heat sealing layer material is generally between 20～80μm, and in special cases, it can also reach 100～200μm.
For the same heat sealing material, its heat sealing strength increases with the increase in heat sealing thickness. The heat sealing strength of retort pouches generally requires 40～50 Newtons, so the thickness of its heat sealing material should be above 60～80μm.
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