Material characteristics: Polyethylene is polymerized from ethylene and has the characteristics of being non-toxic, odorless, acid and alkali resistant, low temperature resistant, waterproof and insulating. It is widely used in the packaging field.

Classification and structure

Classified by material density:

High-pressure PE bag (LDPE): Made of low-density polyethylene, it is flexible and transparent, suitable for food preservation film, soft packaging, etc.

Low-pressure PE bag (HDPE): Made of high-density polyethylene, it has high hardness and strong puncture resistance, suitable for heavy object packaging or industrial use.

Recyclable PE bag: Made of recycled polyethylene (such as Recycled LDPE/HDPE), which conforms to the environmental protection trend.

Classified by use and process:

Flat bag: The bottom is sealed, the structure is simple, and it is used for packaging lightweight items.

Resealable bag/zip lock bag: With a reusable sealing strip, it is convenient for storing food or small items.

Anti-static PE bag: Anti-static masterbatch is added to protect electronic products from electrostatic damage.

Core characteristics

Safety:

Food-grade PE bags meet national standards (GB4806.7-2016), are non-toxic and odorless, and are suitable for room temperature food packaging.

Not suitable for high temperature (>110℃), high oil or frozen environments, as it may release harmful substances.

Physical properties:

Low-temperature resistant (-50℃ to 80℃), good chemical stability, but easy to age at high temperatures.

High-pressure PE bags have high toughness but low strength; low-pressure PE bags have high strength but poor ductility.

Environmental protection:

Recyclable PE materials support recycling, reducing resource waste.

Application scenarios

Food packaging:

LDPE cling film is used for preserving vegetables and meat; HDPE bags are used for loose food in supermarkets.

Industry and logistics:

Anti-static PE bags are used for packaging electronic components; HDPE heavy-duty bags are used for transporting machinery parts.

Daily life:

Resealable bags store jewelry and small items; flat bags are used for packaging clothing and daily necessities.

It has the characteristics of flexibility, chemical corrosion resistance, and water resistance, and is widely used in packaging, agricultural covering, and industrial protection.