The applications of LDPE are:
- Film extrusion;
- Cable production;
- Injection molding of plastics;
- Blow molding.
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High-density polyethylene (HDPE) is a PE with linear macromolecule and a relatively high density (0.960 g/cm3). This is a polyethylene, which is also referred to as low pressure polyethylene (LPP); it is produced by polymerization with specific catalyst systems.
Polyethylene (except ultra-high-molecular-weight polyethylene) is processed by all the known techniques for plastics, such as extrusion, extrusion blowing, injection molding, and pneumatic molding. Polyethylene extrusion is possible on the equipment mounted with a “multipurpose” screw.
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Polypropylene is used for the manufacture of pipes , sheets , molded , tapes, films , fibers, yarns , nonwovens and packaging materials , technical products , consumer , medical supplies , toys and articles intended to come into contact with foodstuffs , and other products.
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Linear low density polyethylene (LLDPE) is similar in structure to HDPE, but has the following main advantages: a higher softening point, which makes it possible to use it for prepackaging of hot foods; better performance characteristics at low and high temperatures; a higher chemical resistance; 2-3 times higher resistance to tearing and puncture; a higher strength and relative breaking extension; surface gloss and resistance to cracking. On the world market LLDPE is a more widely used polymer in than LDPE and HDPE, as it allows producing thin films with improved mechanical properties. This material is designed, in particular, for the manufacturing of medical packages, laminated and stretch films. It is most commonly used in the production of stretch film for machine and manual packaging. Compared to shrink packaging, stretch film packaging has the following advantages: there is no need for thermal chambers for film shrink; film expenditure decreases due to its lower thickness and better performance characteristics.
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Is used in domestic sphere of human activity ( disposable tableware , packaging , toys and so on). As well as the construction industry (insulating panels, concrete panel, sandwich panels), cladding and decorative materials (ceiling moldings, ceiling tiles, polystyrene absorbing elements, adhesive, polymer concentrates), medical direction (blood transfusion systems, Petri dishes, disposable auxiliary instruments) .
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