What is the function of the exhaust valve on a coffee bag?

Everyone is familiar with packaging bags because anything we buy usually comes in a packaging bag. But do you know whether the quality of these packaging bags meets the required standards?

1. The appearance should not have defects that interfere with use, such as air bubbles, punctures, water marks, excessive streaks, poor plasticization, fish eyes, or hard lumps. The deviations in width, length, and thickness should all be within the specified tolerance range.

2. Physical and mechanical properties include tensile strength and elongation at break. These reflect the product's ability to withstand stretching during use. If these properties are substandard, food packaging bags (or films) are likely to tear or get damaged during use.

3. Hygiene performance includes evaporative residues (acetic acid, ethanol, n-hexane), potassium permanganate consumption, heavy metals, and decolorization tests. Evaporative residues indicate the likelihood of residues or heavy metals being released when the food packaging bag comes into contact with liquids like vinegar, alcohol, or oil. These residues and heavy metals can have adverse effects on human health. Additionally, residues can directly affect the color, aroma, and taste of food.

4. Degradability can be classified according to the product type into photo-degradable, biodegradable, and environmentally degradable. Degradability reflects the product's ability to be accepted by the environment after disposal. If degradability is good, the bag (or film) will break down, separate, and degrade under the combined action of light and microorganisms, eventually becoming fragments that the natural environment can assimilate. If degradability is poor, it will not be accepted by the environment, resulting in 'white pollution.'

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