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Introduction to knowledge related to food vacuum packaging bags

Release time:

2019-11-28 11:54

The material of the food vacuum packaging bag we usually use knows that it has the characteristics of moisture-proof and good air permeability, so do we really understand the specific performance of its material? Let's introduce it to you.
　　
　
PE polyethylene
　　
Polyethylene resin is a polymer compound formed by addition and polymerization of ethylene monomer, which is an odorless, non-toxic, milky waxy solid, and its molecular structure formula: _E-CH2-CH2---n; The macromolecule has a linear structure, which is simple and regular, non-polar, has good flexibility, and is easy to crystallize. Polyethylene plastic is composed of PE resin with a small amount of additives such as lubricants and antioxidants.
　　
1. The main packaging characteristics of polyethylene are good water and moisture resistance, but the performance of gas and organic vapor resistance is poor
 
It has good chemical stability, and does not work with general acid and alkali at room temperature, but the oil resistance is slightly poor; It has certain mechanical tensile and tear strength, and good flexibility; It has good low temperature resistance and can adapt to the freezing treatment of food, but it has poor high temperature resistance and generally cannot be used for the packaging of high-temperature sterilized food; Glossiness, transparency is not high, printing performance is poor, used as outer packaging needs to be corona treatment and surface chemical treatment to improve printing performance; It is easy to process and form, the products are flexible and diverse, and the heat sealing performance is very good. PE resin itself is non-toxic and has very few additives, so it is considered to be a safe packaging material.
　　
2. The main varieties, performance characteristics and applications of ethylene
　　
(1) High-pressure low-density polyethylene (LDPE) has a linear macromolecular structure with many branches, low crystallinity, and low density, which is 0. 91~0. 94 g/cm3, therefore, the gas and oil resistance is poor, and the mechanical strength is also low, but the elongation, tear resistance and impact resistance are good, the transparency is high, and the heat sealability and processing performance are good.
　　
LDPE is mainly made into film on packaging, which is used for food with low packaging requirements, especially dry food with moisture-proof requirements.
　　
With its good air permeability, it can be used for fresh-keeping packaging of fresh fruits and vegetables, and can also be used for frozen food packaging, but it should not be used alone for food packaging with oxygen insulation requirements; After stretching treatment, it can be used for heat shrink packaging, because of its heat sealability, good health and safety, low price, often used as a heat sealing layer of composite materials, a large number of used in the packaging of various types of food.
 
For more information, please visit our website: http://www.yinglianpack.com/
 
 

Introduction to knowledge related to food vacuum packaging bags

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