How are plastic bags inspected? What are the inspection standards for plastic bags used in food packaging?
Adopting standards and classifications
1. Domestic standard for plastic bag inspection: GB/T 41168-2021 Plastic and aluminum foil composite film and bag for food packaging
2. Classification-According to structure: Plastic bags for food are divided into Class A and Class B according to structure-Classified by usage temperature: Plastic bags for food are classified into boiling grade, semi high temperature steaming grade, and high temperature steaming grade according to usage temperature.
Appearance and craftsmanship
-Visually observe under natural light and measure with a measuring tool with an accuracy of not less than 0.5mm:-Wrinkles: Slight intermittent wrinkles are allowed, but not exceeding 5% of the product surface area;-Scratches, burns, punctures, adhesions, foreign objects, delamination, and dirt are not allowed;-Elasticity of film roll: there is no sliding between the film rolls when moving;-Film roll exposed reinforcement: Slight exposed reinforcement that does not affect use is allowed;-Unevenness of film roll end face: not greater than 2mm;-The heat sealing part of the bag is basically flat, without any loose sealing, and allows for bubbles that do not affect its use.
Packaging/Identification/Labeling
Each package of the product should be accompanied by a certificate of conformity and indicate the product name, category, specifications, usage conditions (temperature, time), quantity, quality, batch number, production date, inspector code, production unit, production unit address, execution standard number, etc.
Physical and mechanical performance requirements1. Abnormal odorIf the distance from the test sample is less than 100mm, conduct an olfactory test and there is no abnormal odor.
2. Connector
3. Plastic bag inspection - size deviation:
3.1 Film size deviation
3.2 Size deviation of bagsThe size deviation of the bag should comply with the provisions in the table below. The heat sealing width of the bag shall be measured with a measuring tool with an accuracy of not less than 0.5mm.
4 Plastic Bag Inspection - Physical and Mechanical Properties
4.1 Peel force of bag
4.2 Heat sealing strength of the bag
4.3 Tensile strength, nominal strain at break, right angle tear force, and resistance to pendulum impact energy
The style adopts a long strip shape, with a length of 150mm and a width of 15mm ± 0.3mm. The spacing between the style fixtures is 100mm ± 1mm, and the stretching speed of the style is 200mm/min ± 20mm/min.
4.4 Plastic bag water vapor permeability and oxygen permeability
During the experiment, the contact surface of the content should face the low pressure side or low concentration side of water vapor, with a test temperature of 38 ° ± 0.6 ° and a relative humidity of 90% ± 2%.
4.5 Pressure resistance of plastic bags
4.6 Drop performance of plastic bags
4.7 Heat resistance of plastic bags
After the heat resistance test, there should be no obvious discoloration, deformation, interlayer peeling, or heat sealing peeling and other abnormal phenomena. When the sample seal is broken, it is necessary to take a sample and redo it.
From fresh food to ready to eat food, from grains to meat, from individual packaging to transportation packaging, from solid food to liquid food, plastic bags have become a part of the food industry. The above are the standards and methods for inspecting plastic bags used in food packaging to ensure food safety.
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