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The thickness of food bags should be selected according to different needs, generally between 20-120 μm is more suitable.
What are the common thicknesses of food bags?
The thickness of food bags is usually expressed as "micro", 1 micro is equal to 0.001 mm, and common thicknesses are 60μm, 80μm, 100 μm, 120μm, etc. Among them, 20-60 μm are thinner and 120μm are relatively thick. Food bags of different thicknesses are suitable for different fields and need to be selected according to actual needs.
What fields are food bags of different thicknesses suitable for?
60μm: Suitable for packaging of light commodities, such as stationery, socks, snacks, etc. For products with lighter weight and smaller shapes, we can choose the total thickness 60μm of the bags.
80μm: Suitable for medium-sized product packaging, such as bread, candy, cakes, etc. If the packaging needs to be light and economical, 80μm thickness is generally selected.
100μm: suitable for heavy-duty commodity packaging and fresh-keeping packaging, such as nuts, dry goods, vegetables, etc., which require strong moisture-proof and antioxidant capabilities. Generally, 100μm thickness is selected.
120μm: Suitable for super-heavy commodity packaging and advanced fresh-keeping packaging, such as fruits, meat, etc., which require stronger moisture-proof, anti-pollution and fresh-keeping capabilities. Just choose 120μm thickness.
How to choose the right food bag?
How do you choose the appropriate thickness according to the product field? You also need to pay attention to the following points:
Thickness guarantee: Be sure to check the thickness of the bag when purchasing to avoid the manufacturer exaggerating the thickness and causing the packaging bag to not meet the requirements.
Pressure test: Try to hold the packaging bag and squeeze it hard to test the pressure resistance of the bag to ensure that the bag can prevent chipping or damage.
Raw material selection: When purchasing, you should choose PE food packaging bags that meet national standards to avoid using unqualified materials that may cause harm to food.
For packaging bags of several grams such as some cookies, heat-sealing OPP can be used, and the vacuum packaging thickness can be about 20-150μm. For large-capacity ones, 5kg and 10kg rice can be packed into 180μm. Food packaging of more than 10 kilograms (some say more than 15 kilograms) is called heavy packaging. The maximum heavy packaging is 25 kilograms. The bag for 25kg can be made of PE or lamination with the total thickness less than 250μm.
To sum up, the thickness of food bags should be selected according to product classification and needs. Generally speaking, the total thickness of 80-120μm is more suitable. When purchasing, make sure that the thickness, pressure resistance and raw materials of the bag meet the requirements to ensure the safety and quality of the packaged food.
How do we calculate the thickness of a plastic bag based on its grammage of the bag?
Grammage and thickness belong to different specifications. Grammage is mainly the weight of an item. Thickness is determined by the material. If the thickness of a good material is thicker, the density will be guaranteed in the packaging. Plastic bags are divided into many types: Food For plastic bags and chemical plastic bags, it is best to ask the seller about the thickness.
Different plastic materials have different densities and actual processes. Their thickness cannot be calculated directly based on their grams. Instead, it must be actually measured or queried based on the "Product Gram Thickness Correspondence Table" provided by the merchant.
Including paper, grams are also commonly used to express specifications. When you want to know the thickness, you must either actually measure it or query it based on the "gram thickness correspondence table."
In fact, we don’t directly calculate the thickness in daily life.
In general, the thickness of plastic bags will vary depending on usage and load-carrying capacity requirements. When consumers purchase plastic bags, they can reasonably choose plastic bags with corresponding thickness according to their own needs to achieve the best use effect.
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