• Categories:Industry News
• Author:
• Origin:
• Time of issue:2020-03-23
• Views:4

(Summary description)With the improvement of people's living standards, more attention is paid to the quality of life. The use of packaging bags is essential for food storage and market circulation, and the safety of food packaging bag materials is also very important.



　The following briefly introduces three common food packaging bag materials

1. PE polyethylene
　The main ingredient is polyethylene resin, with a small amount of lubricants, aging agents and other additives. Polyethylene is an odorless, non-toxic, waxy solid with a milky white appearance. The surface gloss and transparency of the produced packaging bags are not high. Good plasticity.

　1. Good barrier performance: Effectively prevent water and moisture from entering, but the barrier performance is not very good.

　2. Strong chemical stability: It does not react with acids and alkalis at room temperature, but has poor oil resistance.

　3. Mechanical properties: good tensile strength, tear strength and flexibility.

　4. High temperature and low temperature resistance: It has good low temperature resistance and can be used for food refrigeration, but it has poor high temperature resistance and cannot be cooked with frequent high temperatures.

　5. Hygiene and safety: in line with food safety standards, it can be in direct contact with food.

2. PP polypropylene
　The main component is polypropylene resin, which has high gloss and transparency, and its heat-sealability is worse than PE, but better than other plastic materials.

　1. The barrier performance is better than PE, and the strength, hardness and rigidity are higher than PE;

　2. Hygienic safety is higher than PE

　3. Excellent high temperature resistance, can be used for a long time at a temperature of 100 to 200 degrees Celsius, but the low temperature resistance is worse than PE, and the performance becomes brittle when it reaches -17 degrees Celsius.

　Polypropylene is mainly made of food packaging bags made of film materials. It has better water resistance and moisture resistance than PT. The material is transparent and tear-resistant, but the printability is worse than PT and the cost is lower. It can be used for twisted packaging of sweets and snacks. It can also be made into heat-shrinkable film, used for food heat-shrink packaging, such as food vacuum packaging bags and other composite packaging bags.

Three, PS polystyrene
"The main component is a polymer of styrene monomer. The material is transparent and has good gloss.

　1. The moisture resistance is worse than PE, the chemical stability is general, and it has higher rigidity, but it is more brittle.

　2. Good low temperature resistance, but poor high temperature resistance, not higher than 60~80 degrees Celsius.

　3. Good safety factor.

　It is mainly made into food boxes, fruit plates, tableware, cold drink cups, etc.

Food packaging bag materials commonly include composite films made of different types of plastics such as PE polyethylene, PP polypropylene, PS polystyrene, melamine, and composite packaging bags made of composite materials such as multi-layer and laminated films. These materials vary according to different materials. The characteristics and different processing techniques can produce different kinds of packaging bags such as rice vacuum packaging bags, dog food self-supporting zipper bags, condiment plastic packaging bags, tea packaging bags, etc.