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The function and inspection standard of plastic bags

The function and inspection standard of plastic bags

2023-01-13 16:27:00

bstract: Food packaging bags are often used in our life to keep fresh and store food. In addition to providing physical protection and shell protection, food packaging can also convey information, marketing, help manufacturers calculate inventory sales and so on. Food packaging bags are directly in contact with food, so the standard requirements are higher. It needs to go through six inspection procedures, such as health inspection, safety inspection, degradability inspection and appearance inspection. The material of food packaging bags is basically composed of two to three kinds of materials, and different materials of packaging bags have different uses. Here to understand the relevant knowledge of food packaging bag!

What role does food bag have:

1. Physical protection

Food stored in plastic bags should avoid extrusion, impact, vibration, temperature difference and other phenomena.

2. Shell protection

The shell can keep food away from oxygen, water vapor, stains, etc., and anti-leakage is also a necessary factor in the packaging design. Some packages contain desiccant or deoxidizing agents to extend the shelf life. Vacuum packaging or removing the air from the packaging bag is also the main food packaging method. Keeping the food clean, fresh and safe within the shelf life is the primary function of the packaging bag.

3. Deliver the message

Packaging and labeling tell people how packaging or food is used, transported, recycled or disposed of.

4. Marketing


Marketing often uses box labels to encourage potential buyers to buy goods. Packaging design has been a pivotal and changing phenomenon for decades. Marketing communications and graphic design are used to highlight the box and (for a number of reasons) the sales display.

5. Safety

Packaging can reduce transportation safety risks and prevent food from being mixed with other products. Some food packaging is very firm and with anti-counterfeiting marks, the role is to protect the interests of the business from loss. The package can have laser logo, special color, SMS authentication and other labels. In addition, retailers are putting electronic monitoring labels on food bags to prevent theft, which are used to demagnetize consumers when they take them out of the store.

6. Calculate inventory sales

A single package helps you get an accurate grasp of the overall situation. Salt, for example, can be packed to know how much is in stock. It also makes it easier to count recent sales, such as dairy companies delivering and recycling milk bottles rather than letting consumers fill them themselves.

What are the inspection standards for food packaging bags?

1. Health inspection

In soft packaging, its hygiene is very important, because it is directly in contact with our daily food, so the primary standard of its inspection is to pass the hygiene. Including evaporation residues (acetic acid, ethanol, n-hexane), potassium permanganate consumption, heavy metals, decolorization tests. Evaporation residue reflects the possibility of residue and heavy metals precipitated from food packaging bags when they encounter vinegar, wine, oil and other liquids in the process of use. Residue and heavy metals will have adverse effects on human health. In addition, residue will directly affect the edible quality of food such as color, aroma and taste.

2. Security inspection

The raw materials and additives used in the bags should meet the relevant national quality requirements and ensure that they will not cause poisoning and other harm to the human body.

3. Degradability test

Degradation types of products can be divided into photodegradation type, biodegradation type and environmental degradation type. If the degradation performance is good, the bag will spontaneously break, differentiate and degrade under the combined action of light and microorganisms, and eventually become debris, which is accepted by the natural environment and avoids white pollution.

4. Appearance inspection

The appearance of food packaging bags should be flat, without scratches, burns, bubbles, broken oil and wrinkles, and flat and without virtual sealing. Film shall not have cracks, pores and composite layer separation. No impurities, foreign bodies and oil stains and other pollution.

5. Specification inspection

Its specification, width, length, thickness deviation should be within the specified range.

6. Physical and mechanical property inspection


That is, the quality of the bag is better. The physical and mechanical properties were tested including tensile strength and elongation at break. It reflects the ability of the product to stretch in the process of use. If the product has poor tensile ability, it will be easy to crack and damage when in use.

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