Polyethylene Extrusion Plants

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From LDPE to HDPE: Polyethylene as a Flexible Solution in Extrusion Processes

Polyethylene is among the most widely used materials in extrusion processes, thanks to its combination of flexibility, chemical resistance, lightness, and design versatility: these are the main benefits of polyethylene extrusion compared to other thermoplastic materials. Depending on the type used — HDPE, LDPE, LLDPE, or MDPE — it is used across very different sectors, from piping systems for drinking water, gas, and technical fluids, to the production of packaging film, flexible pouches, rigid containers, construction profiles, protective sheaths for electrical cables, and medical components. Its chemical inertness, combined with excellent resistance to environmental stress cracking, makes polyethylene ideal even under demanding operating conditions, such as those found in the chemical and agricultural industries and in infrastructure.
Bausano, among the leading manufacturers of polyethylene extruders, makes it possible to adapt the process to the specific needs of every application, with single- or multi-layer co-extrusion configurations, integrating additional functions such as UV protection, moisture barriers, or technical adhesive layers. The properties of polyethylene that drive its success in extrusion processes include:

Properties of Polyethylene

The properties of polyethylene that drive its success in extrusion processes include:

High chemical resistance
Excellent electrical insulation
Good impact resistance
Dimensional stability
Good mechanical strength relative to weight
Recyclability

When it comes to polyethylene, it is important to consider that this polymer is classified into different types mainly based on:

Molecular weight
Density

These characteristics, which can be modified during the polymer's production, significantly affect the technical specifications of the finished product, enhancing certain parameters and making it ideal for specific applications.

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Types of Polyethylene

Polyethylene is classified by its density so there are a consistent number of PE type to be processed in Extrusion:

High-density polyethylene (HDPE)
Low-density polyethylene (LDPE)
Ultra-high-molecular-weight polyethylene (UHMWPE)
Ultra-low-molecular-weight polyethylene (ULMWPE or PE-WAX)
High-molecular-weight polyethylene (HMWPE)
High-density cross-linked polyethylene (HDXLPE)
Cross-linked polyethylene (PEX or XLPE)
Medium-density polyethylene (MDPE)
Linear low-density polyethylene (LLDPE)
Very-low-density polyethylene (VLDPE)
Chlorinated polyethylene (CPE)

The best known and most widely used types remain high-density polyethylene (HDPE) and low-density polyethylene (LDPE).

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Applications of Polyethylene

As stated above, depending on their properties, the various types of PE have different applications.

Pipe Fluid and gas transfer solutions,
Packaging solutions, Consumer goods,
Agriculture ropes and
Fibers and Textile
Pipes and fittings
Packaging of medical products and bottles

Polyethylene film is the most widely used material for packaging due to its transparency and flexibility combined with the strength and ease with which it takes the shape of the object to be protected. LDPE and LLDPE are the ones most used for this type of application.

Ultra-high molecular weight polyethylene (UHMWPE) is now replacing Kevlar in the production of bulletproof vests.

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Polyethylene Rheology as a Key Factor in the Extrusion Process

The rheological behavior of polyethylene has a direct impact on all extrusion process parameters. As a pseudoplastic material, PE exhibits decreasing viscosity with increasing shear rate, a characteristic that influences screw configuration, barrel design, and the plant's thermal profile. Processing HDPE requires higher melting temperatures and greater pressures compared to LDPE, due to its higher crystallinity and molecular rigidity. Conversely, LDPE and LLDPE, which are more flexible and branched, offer easier flow but require fine cooling control to avoid dimensional instability. Bausano, thanks to decades of testing on real materials and in-house rheological analysis, designs tailor-made extruders for every formulation, optimizing melt quality, hourly output, and dimensional consistency of the product, even over long production cycles and with recycled materials. Bausano extruders for polyethylene applications are designed to ensure high performance in the extrusion of PE pipes. For this type of production, the most common solution is single-screw extruders, optimized to ensure process stability and consistent quality of the finished product.

A starting point to define the right solution together

By filling in the form below, it is possible to describe specific technical or production requirements. The technical team will carefully evaluate the request in order to propose the most suitable extrusion line or extruder.