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What are the classifications of food packaging materials?

What are the classifications of food packaging materials?

name Shorthand feature Water barrier Gas barrier Mechanical strength Extensibility Low temperature resistance High temperature resistance transparency
Polyethylene PE
it is good difference

well difference not tall
High pressure low density polyethylene LDPE

difference low it is good

Higher
Low pressure high density polyethylene HDPE
Higher than LDPE Higher than LDPE Higher than LDPE


Lower than LDPE
Linear low density polyethylene LLDPE

difference Higher than LDPE



Polypropylene (BOPP, OPP) PP The lightest food packaging plastic Water vapor transmission rate is similar to HDPE oxygen transmission rate Oxygen transmission rate
Also similar
Ok, higher than PE it is good Poor than PE
-17 ° C becomes brittle
excellent it is good
Polystyrene PS The main disadvantage is brittleness Poor, lower than PE difference Good rigidity and brittleness; poor impact resistance
good Poor, for
60°C-80°C
Ok, up to
88%-92%
name Printing performance Heat sealability Flexibility Processability Health and safety Scope of application
Polyethylene Poor, need to be processed well it is good
it is good Adapt to food freezing treatment
High pressure low density polyethylene
it is good
it is good
Mainly made into film, used for packaging foods with lower requirements, dry foods for moisture protection, fresh-keeping packaging for fresh fruits and vegetables; packaging for frozen foods
Low pressure high density polyethylene
Lower than LDPE Lower than LDPE Lower than LDPE
Compared with LDPE, it can save raw materials at the same strength, and it is used as a heat sealing layer of composite film for packaging of high temperature sterilization food.
Linear low density polyethylene
Higher than HDPE better

Mainly made into film, used for packaging meat, frozen food, dairy products, poor gas barrier, can not meet the long-term maintenance requirements
Polypropylene (BOPP, OPP) Poor, need to be processed Poor than PE

Higher than PE The film needs to be oriented and stretched better than CPP. It can be packaged with oil-containing foods. It can be used to replace snacks and breads in cellophane. It can be used as twisted and packaged candy and snacks to make ropes of various forms.
Polystyrene


it is good Good, non-toxic, tasteless Made of transparent food box, fruit plate, bright and colorful foam EPS can be used as insulation and cushioning packaging materials, such as: fast food box

The materials used in common food packaging bags are divided into six categories:


1. Material: BOPP/LLDPE two-layer composite

Features: moisture-proof, cold-resistant, low-temperature heat seal

Uses: instant noodles, snacks, frozen snacks, powder packaging, etc.


2, material: BOPP / CPP two-layer composite

Features: moisture, oil, high transparency, good stiffness

Uses: instant noodles, biscuits, candy, all kinds of light food


3, material: BOPP / VMCPP composite

Features: moisture-proof, oil-resistant, oxygen-proof, shading, good stiffness

Compound bag

Uses: all kinds of dry food, fried food, potato chips


4, material: BOPP / VMPET / LLDPE three-layer composite

Features: moisture, oxygen, shading

Uses: all kinds of food, metric snacks, snacks, tea


5, material: PET / CPP two-layer composite

Features: moisture, oxygen, fragrance, high temperature

Uses: cooking, alcoholic foods, flavored foods


6, material: PET / PET / CPP three-layer composite

Features: moisture proof, high temperature resistance, easy sealing

Uses: powder packaging, soy sauce, liquid, shampoo


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