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How to distinguish the materials of food packaging bags?

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

1. Material: BOPP /LLDPE two-layer composite

characteristics: moisture resistance, cold resistance and strong low-temperature heat sealing tension

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

2. Material: BOPP /CPP two-layer composite

characteristics: moisture resistance, oil resistance and high transparency, Good stiffness

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

3. Material: BOPP /VMCPP composite

characteristics: moisture resistance, oil resistance, oxygen isolation, shading, good stiffness

composite bag

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

4. Material: BOPP /VMPET /LLDPE three-layer composite

characteristics: moisture resistance, oxygen isolation, Shading

purpose: all kinds of food, rice snacks, snacks, tea

5. Material: PET /CPP two-layer composite

characteristics: moisture-proof, oxygen isolation, aroma preservation, high temperature resistance

purpose: cooking, alcoholic food, aroma food

6. Material: PET /PET /CPP three-layer composite

characteristics: moisture-proof, high temperature resistance, easy sealing

purpose: powder packaging, soy sauce, liquid, Shampoo

extended data

function of food packaging bag:

physical protection

the food stored in the packaging bag needs to avoid extrusion, impact, vibration, temperature difference and other phenomena

shell protection

the shell can separate food from oxygen, steam and stains. Anti leakage is also a necessary factor in packaging design. Some packages include desiccants or deoxidizers to extend the shelf life. Vacuum packaging or pumping the air from the packaging bag is also the main food packaging method. Keeping food clean, fresh and safe within the shelf life is the primary function of packaging bags

the same package

inserting small objects of the same kind into one package is a good way to save volume. Powder and granular objects need to be encapsulated

convey information

packaging and labels tell people how to use, transport, recycle or dispose of packaging or food

marketing

Marketing often uses box labels to encourage potential buyers to buy goods. Packaging design has become an important and changing phenomenon for decades. Marketing communication and graphic design are applied to the highlights of outer packaging boxes and (for some reasons) sales presentations

safety

packaging can play an important role in reducing transportation safety risks. Bags can also prevent food from being classified into other goods. Food packaging can also reduce the possibility of food being eaten secretly. Some food packages are strong and have anti-counterfeiting marks to protect the interests of businesses from loss. The packaging bag can have laser logo, special color, SMS certification and other labels. In addition, retailers put electronic monitoring labels on food packaging bags to prevent theft, and consumers take them to the outlet of the store for degaussing

convenience

packaging may be easy to add, load, unload, stack, display, sell, open, reload, use and reuse

partial control

single packaging helps to accurately control the overall situation. For example, the inventory of salt can be known by packing it. It is also convenient to calculate sales, such as the distribution and recycling of milk bottles by dairy companies, rather than allowing consumers to fill them themselves

References:

Baidu Encyclopedia – food packaging bags

generally, the materials used for food packaging bags include PET film, PE film, PA film, OPP film and CPP film
features:
Pet Film: this film is super transparent, hard, high temperature resistant and has good printing effect. It is more suitable for making outer packaging bags for food. PET film feels very fragile and can make a rustling and brittle sound when held in your hand

PE film: the transparency is slightly inferior to CPP, but softer than CPP. PE film has better tensile properties and tensile breaking force. There are two kinds of milky PE and transparent PE (HDPE /LDPE /LLDPE), which feel soft

PA film (nylon): PA material is tough, transparent, wear-resistant, puncture resistant, easy to be oxidized, easy to shrink and wrinkle. This material is suitable for similar bone products

OPP film: the material is hard and can not be stretched. The heat sealing type is very good, but the transparency is general, the material is brittle and the hand feel is poor

CPP Film: the transparency of CPP material is worse than OPP, but better than PE. The material is soft and resistant to high temperature. It can be used as printing material, but it is not easy to print.

food packaging bags are mainly made of PVDC (polyvinylidene chloride), PE (polyethylene), PA (nylon), EVOH (ethylene /vinyl alcohol copolymer), aluminized film (aluminum + PE), etc.
various materials have different properties and uses. General food packaging bags are not made of a single material, but are generally made of multi-layer composite
the red casing of ham sausage is made of a single material PVDC
however, the packaging bag is not a single material. Generally, the inner layer is PE, the outer layer is PA, and the middle may be EVOH, PVDC, etc.
some use aluminized film
reason: PE has excellent heat sealing performance, which is easy to seal
PA has good printability. When used in the outer layer, it can print beautiful pictures
PVDC and EVOH have good barrier and prevent oxidation. The aluminized film has good light closing property and is suitable for products that are not easy to see light
the details are quite professional, so I won’t introduce them one by one

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