PE bags are plastic packaging bags made of HDPE (low pressure high density) or LDPE (high pressure low density), which are blown out by a film blowing machine and then sealed by a bag making machine. They can also be sold directly, and the tubes can be cut and sealed by customers according to their needs. PE bags are divided into high-pressure bags and low-pressure bags according to the different particles used; they can be divided into flat bags, hemming bags, and square bottom bags according to the production process.

PE plastic bags are the most widely used in the market. From the outside, PE plastic bags can be divided into two types: translucent and opaque. According to the classification of density, they can be divided into low-density and high-density. Among them, low-density PE plastic bags are generally flexible, and high-density plastic bags are more durable.

Performance

Polyethylene has excellent low temperature resistance (the lowest operating temperature can reach -70бл-100бц), good chemical stability, can withstand most acid and alkali corrosion (not resistant to oxidizing acids), is insoluble in general solvents at room temperature, has low water absorption, and has excellent electrical insulation properties; but polyethylene is very sensitive to environmental stress (chemical and mechanical effects) and has poor heat aging resistance. The properties of polyethylene vary from variety to variety, mainly depending on the molecular structure and density. Different production methods can produce products with different densities (0.91бл0.96g/cm3). Polyethylene can be processed using the molding methods of general thermoplastics (see plastic processing).

Uses

It has a wide range of uses, mainly used to make films, containers, pipes, monofilaments, wires and cables, daily necessities, etc., and can be used as high-frequency insulation materials for televisions, radars, etc.

Types

According to materials: PE is divided into LDPE, LLDPE and HDPE, etc.

According to the production process, it can be divided into: PE flat bag, ziplock bag, zipper bag, envelope bag, punching handbag, hand-held handbag, zipper bag, PE film.

1. PE flat bag is the simplest production process. After the machine blows the film, it is cut into bags one by one on the bag making machine and sealed at the bottom.

2. Ziplock bag is a bag with a bone strip when the machine blows the film, which can be sealed manually. Unlike ziplock bag, these two types of bags are generally easy to confuse.

3. Ziplock bag is a bag made of PE film with two ziplock strips on it (this ziplock strip is a separate one). There are generally wide indentations on both sides of the bag, while ziplock bag does not. Ziplock bag has fewer printing colors, while ziplock bag can print complex patterns.

4. Envelope bag has a tongue like an envelope. A strip is attached to the tongue and the bag can be sealed by folding it. It is generally used more in clothing. In addition, express bag is actually a kind of envelope bag.

5. Punching a handbag means punching a hole at the top of a flat bag to facilitate lifting the bag.

6. For a hand-held handbag, a plastic film strip is added to the top of the bag to facilitate lifting the bag. This process is labor-intensive and relatively costly.

7. A zipper bag means installing a zipper strip and a zipper cap at the seal of the bag.

8. PE film is a film that is not made into a bag after being blown out by a machine. It is also divided into wrapping film and shrink film.

Commonly used in the market are counting by piece and counting by length (roll). (piece) Small bags are mainly used for packaging small accessories. Most of the accessory bags for electronic products have anti-static effects. The bag mouth is divided into flat mouth and self-sealing structure. The latter is also called bone bag (PE bone bag) or dense bag;

(roll) bags need to be cut by themselves (for material packaging) and printed with cuts (for supermarkets).

PE cling film can also be called PE bag. Note that cling film that comes into direct contact with food must be made of PE material (others are generally PVC), which is safer for the human body. Identification method: The transparency, stretchability and viscosity of PVC cling film are stronger than PE cling film. When PVC cling film is burned with fire, the flame is black, emits black smoke, has a pungent smell, does not drip oil, and will automatically extinguish after leaving the fire source. When PE cling film burns, the flame is yellow, odorless, will drip oil, and can continue to burn after leaving the fire source.

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