Jinan Fengyi Commodity Co., Ltd

Not all plastic bags have the same strength capacity. The strongest type of plastic bag depends on how the plastic is manufactured. In fact, different types of plastic bags were developed just for their strength properties. The strongest plastic bags are made of HDPE or high-density polyethylene. Material changes that determine thickness and strength occur during the polymerization process.   The strength of plastic bags depends on the way ethylene reacts  during the polymerization process. To make polyethylene, small molecules of ethylene combine together to form a chain of molecules called a polymer. From this main chain, branches can begin to form. The more branches that are formed, the thinner and less dense the resulting polyethylene is. In order to make denser, stronger polyethylene, fewer branches must be formed. For example, if the polymer has a relatively straight main chain with few branches, it is called high-density polyethylene. HDPE is made of tightly packed molecules, wh

Plastic bags are made from a ubiquitous polymeric material called polyethylene. This starts with ethylene, usually extracted from natural gas, which is then processed into a polymer, forming long chains of carbon and hydrogen atoms. These chains can vary depending on the type of polyethylene used, but they all contribute to the manufacture of various types of plastic bags.   Materials used to make plastic bags Low Density Polyethylene Plastics LDPE plastic is made from low-density, branched polymeric materials. Rather than remaining linear, these polyethylene chains unfold in many different combinations of lines. This produces a very light, almost film-like plastic used to make the tearable bags dry cleaners use to wrap cleaned clothes.   High Density Polyethylene Plastics HDPE stands for high density polyethylene  and is the most common type of polyethylene used to make shopping bags. This plastic consists of straight molecular chains with few molecular chains that remain linear from

The Advantages of the LDPE Plastic Bags Low-density polyethylene is the lightest variety among polyethylene resins. Compared with high-density polyethylene, its crystallinity (55%-65%) and softening point (90-100℃) are lower; it has good flexibility, elongation, transparency, cold resistance and processability; its chemistry Good stability, resistance to acid, alkali and salt solutions; good electrical insulation and air permeability; low water absorption; easy to burn. It is soft in nature, with good extensibility, electrical insulation, chemical stability, processing performance and low temperature resistance (-70℃).   The Disadvantages of LDPE Plastic Bags The disadvantage of LDPE is its poor mechanical strength, moisture barrier, gas barrier and solvent resistance. The molecular structure is not regular enough, the crystallinity (55%-65%) is low, and the crystal melting point (108-126℃) is also low. Its mechanical strength is lower than that of high-density polyethylene, and its im

As a plastic bags supplier,   Fengyi   will introduce the differences between the HDPE and LDPE plastic bags.   HDPE Plastic Bags HDPE Plastic Bags   HDPE is non-toxic, tasteless and odorless. Its density is 0.940～0.976g/cm3. It is a product of polymerization under low pressure conditions under the catalysis of a catalyst, so high-density polyethylene is also called low-pressure polyethylene.   The Advantages of the HDPE Plastic Bags   HDPE is a non-polar thermoplastic resin with high crystallinity produced by copolymerization of ethylene. The appearance of the original HDPE is milky white, and the thin section is translucent to a certain extent. It has excellent resistance to most domestic and industrial chemicals. It can resist the corrosion and dissolution of strong oxidants (concentrated nitric acid), acid-base salts and organic solvents (carbon tetrachloride). The polymer does not absorb moisture and has good water vapor resistance, and can be used for moisture-proof and anti-seep