What Is LLDPE Granules? Its Application In Production
Surely the readers who are reading may have never heard of the name LLDPE plastic, right? As a line of primary plastic possessing outstanding advantages, it is widely used in many different fields, but so far it is still unfamiliar to many people. So let’s explore the origin as well as the advantages and disadvantages of LLDPE plastic beads with Hadupack!
WHAT IS LLDPE granules?
Linear low density polyethylene (LLDPE) is a significantly linear polymer (polyethylene), with a significant number of short branches, usually made of copolymers of ethylene with longer chains than olefins.
Linear low-density polyethylene is structurally different from conventional low-density polyethylene (LDPE) because there is no long chain branching. The linearity of LLDPE is the result of different manufacturing processes for LLDPE and LDPE. In general, LLDPE is produced at lower temperatures and pressures by copolymerization of ethylene and higher alpha-olefins such as butene, hexene, or octene. The copolymerization produces LLDPE polymer with a narrower molecular weight distribution than conventional LDPE and combined with a linear structure, significantly different rheological properties.
Features of LLDPE . resin beads
LLDPE virgin plastic beads are better than LDPE in that they have higher durability, impact resistance, and puncture resistance. Not only that, the toughness is also better than other types of plastic beads. Flexible characteristics, easier to create thinner films than LDPE, saving materials and reducing product costs.
LLDPE has a lower viscosity in the deformed state during melt elongation. Its two outstanding rheological properties are “hard in shear” and soft in stretch” and it is also not as stiff as LDPE.
Besides, LLDPE also has certain disadvantages. Because it is not easy to process and has less clarity than LDPE, users will combine both LLDPE and LDPE in production to improve properties.
LLDPE is a combination of LDPE and HDPE. Compared to the properties, the strength is higher than LDPE and on par with HDPE and the stiffness is lower than HDPE.
Application of LLDPE resin in production:
All products created from conventional LLDPE will have milky white particles and have 3K properties: non-toxic, tasteless, odorless. The advantages of LLDPE are hardness, high strength, good toughness, cold resistance, heat resistance, little influence of external impact… It also has good resistance, crack resistance, resistance to impacts. from the environment such as resistance to acids, organic solvents, etc.
Today, LLDPE plastic is used to produce many items for the market such as:
- Production of plastic water tanks
- Laminating packaging film, adhesive tape, electrical cables, finished film (imitation paper film)
- Plastic injection molding used for low quality items and outer shells.
- Plastic blow molding used to make containers, bottles, jars…
The simplest way to distinguish LLDPE, HDPE and LDPE:
The fastest and most accurate way to distinguish between LLDPE, LDPE and HDPE virgin plastic pellets is based on density. Looking at the density we will know their mechanical properties clearly, some are hard, some are flexible. LLDPE primary plastic differs from the other two plastic lines in its molecular structure, with more branch chains, so it is both flexible and hard.
a. Distinguishing based on advantages
Primary LLDPE plastic beads have the ability to resist acids and alkalis, good electrical insulation, and retain plasticity at low temperatures. Besides, surface hardness, tensile strength, stiffness… are significantly higher than LDPE but lower than HDPE.
In terms of puncture strength advantages, LLDPE is the best. Along with that is the ability to withstand cracking in each situation. It is the best material for producing thin film (thinner than LDPE film) but with high strength.
b. Distinguishing LLDPE plastic beads through disadvantages
LLDPE virgin plastic pellets have poor mechanical properties and air permeability. Not only that, the aging, easy deformation, brittleness is lower than that of PP plastic, so it is easy to crack due to stress. In addition, the surface hardness is low, it is easy to be scratched, it is difficult to print, cannot be plated, and the surface is not smooth and bright. In general, LLDPE plastic does not bring high aesthetics.
Above is information related to LLDPE plastic beads, hope it will help readers!