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Brief Introduction Of Polyethylene For Packaging Film
- Nov 20, 2018 -

Polyethylene (PE) is one of the most widely used plastic products in packaging film. Its molecular structure formula is as follows:


Polyethylene is the sum of a group of polymers obtained by addition reaction of ethylene. Polyethylene can be homopolymer and copolymerized, but it can also be linear and nonlinear. Homopolymer polyethylene is mostly polymerized by ethylene monomer. On the contrary, in polyethylene copolymers, ethylene can copolymerize with some small molecular olefins or some polar functional groups, such as ethyl acetate, acrylic acid, ethyl acrylate, methacrylate and vinyl alcohol.

Polyethylene is an odorless, non-toxic, milky white waxy solid. The main characteristics are as follows:

(1) Molecular structure is linear or branched chain structure, simple and regular structure, good symmetry, easy to crystallize, good flexibility, not easy to embrittle.

(2) There are no active reaction groups and no heteroatoms in the molecule, so it has excellent chemical stability and hardly reacts with any substance at room temperature. It is insoluble in any known solvent at room temperature, but has poor stability to hydrocarbons and oils, which may cause swelling or discoloration. Above 70T, it can be dissolved in xylene, four naphthalene, ten naphthalene and other solvents.

Polyethylene has excellent low temperature resistance and little change in performance at low temperature.

4. Moisture resistance is good, but it has a certain permeability.

5. Good heat sealing.

Polyethylene molecule has no polarity, and polar ink has poor adhesion to it, resulting in poor printability, so surface treatment should be carried out before printing. Similarly, surface treatment is also required to increase the printing or composite fastness of polyethylene films before they are dry-mixed with other films.

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