Paper-plastic composite bags have good barrier properties, heat sealing properties, moisture resistance, and acid resistance, alkali resistance, and wear resistance, so they are widely used in food packaging. With the increasing demand for the quality of paper-plastic composite bags, packaging enterprises are paying more and more attention to the quality inspection of paper-plastic composite bags. Let's take a look at how to judge the quality of paper-plastic composite bags?
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Appearance visual inspection
Appearance visual inspection includes inspection of the flatness and transparency of the composite bag. It is mainly used to detect whether there are obvious scratches and pinholes on the surface of the composite bag, and whether there is pollution at the seal.
Seal tightness detection
Some small seams at the sealing part, a slight negligence in the visual inspection will bury hidden dangers for the leakage of food in the future, so it is necessary to check the sealing tightness of the composite bag.
Detection of sealing strength
The purpose of the sealing strength test is to observe how much content the composite bag seal can withstand, so as to avoid quality accidents.
Detection of leaks or pinholes
The color permeation method is often used to detect leakage or pinholes in vacuum composite bags with very little air content. Check for colored liquid on the filter paper, then turn the bag over and test again.
Testing of compressive strength and bursting strength
It is also very important to test the compressive strength of the composite bag, the purpose is to detect the bearing capacity of the composite bag.
Perforation resistance detection
Generally, the composite bag drop detection method is used, and the specific operation is as follows: drop the composite bag product on the rough cement floor in the horizontal and vertical directions respectively. The drop height depends on the size and weight of the composite bagged product.
Testing of composite bond strength
The rubbing detection method of the composite bag is adopted. The specific method is: hold a finished bag in the center of the hand and rub it with both hands. If there are cracks, delamination, bubbles and other faults, it indicates that the composite bond strength is poor, otherwise it indicates that High bond strength. If the compound glue concentration is not enough, or the amount of glue is too small, the bond strength of the compound bag will be reduced, thus affecting the product quality.
Testing of compressive strength and bursting strength
.
It is also very important to test the compressive strength of the composite bag, the purpose is to detect the bearing capacity of the composite bag.
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.
Perforation resistance detection
.
Generally, the composite bag drop detection method is used, and the specific operation is as follows: drop the composite bag product on the rough cement floor in the horizontal and vertical directions respectively. The drop height depends on the size and weight of the composite bagged product.
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.
Testing of composite bond strength
.
The rubbing detection method of the composite bag is adopted. The specific method is: hold a finished bag in the center of the hand and rub it with both hands. If there are cracks, delamination, bubbles and other faults, it indicates that the composite bond strength is poor, otherwise it indicates that High bond strength. If the compound glue concentration is not enough, or the amount of glue is too small, the bond strength of the compound bag will be reduced, thus affecting the product quality.
Appearance visual inspection
.
Appearance visual inspection includes inspection of the flatness and transparency of the composite bag. It is mainly used to detect whether there are obvious scratches and pinholes on the surface of the composite bag, and whether there is pollution at the seal.
.
.
Seal tightness detection
.
Some small seams at the sealing part, a slight negligence in the visual inspection will bury hidden dangers for the leakage of food in the future, so it is necessary to check the sealing tightness of the composite bag.
.
.
Detection of sealing strength
.
The purpose of the sealing strength test is to observe how much content the composite bag seal can withstand, so as to avoid quality accidents.
.
.
Detection of leaks or pinholes
.
The color permeation method is often used to detect leakage or pinholes in vacuum composite bags with very little air content. Check for colored liquid on the filter paper, then turn the bag over and test again.
