Making Pipeline Liner from a New Plastic Extrusion

From vehicle manufacturing to medical technology: profiles, tubes, linings, seat belts, and many more components are made of plastic compounds. These mixtures have a specific formula optimized for each purpose.

The technology of the extruder, employing the pipe extrusion line, is responsible for the shape and in particular to ensure the maximum consistency of the quality of plastic products. While the shape conforms to the tools that are used, the quality depends effectively on the "internal qualities" of an extruder. The engineers working for the extruder manufacturers, therefore, always focus on extrusion technology, in order to positively influence quality with new developments.

In the production of pipeline liner using the plastic extrusion, the conditioning of the necessary temperature of the screw of the extruder is carried out using a Rotary Board. This temperature conditioning is the latest technology and a general prerequisite for maintaining the technical parameters.

However, the development engineers work to improve the quality and reproducibility of the production results and the process of homogenizing the behavior of the small PVC pipe extrusion line components.

The tolerances for extruded plastic pipe using the pipe extrusion line differ considerably from metal extrusions. This is because the metals harden quickly, thus being able to obtain smaller tolerances than for the polymeric materials. Obtaining narrow tolerances in the extruded plastic pipe is quite difficult. This depends to a large extent on the raw materials used, the complexity of the part, and the tool that was made to produce it. Some materials, such as PVC, are cooled more efficiently, thus obtaining better tolerances than others that retain more heat, such as polypropylene.

In the extrusion process, the molten material, in this case, a polymer, is forced to pass through a matrix, this forms a continuous profile of constant section that is cooled and solidified. Normally, this process is profitable for simple profiles for high production volumes.

The main advantage of this process is the possibility of creating pipes of great length. In addition, this operation allows the manufacture of  Corrugated Pipe Extrusion Line including the coupling with a rubber gasket.

Generally, the most commonly used plastic extrusion processes are:

Extrusion of the blown film: Also called "tubular film". This process combines extrusion and blowing to produce a thin film. It begins with the pipe extrusion line of the film in a tube, which is stretched to some rollers and at the same time expanded by air to a mandrel. The film to manufacture the bags and sheets/plates are manufactured by this method.

Extrusion of sheets and film: It is used for the extrusion of plastic sheets and film films that are too thick to be manufactured by the previous method. The molten material is extruded through a flat matrix. Then, it is stretched through a set of cooling rollers that are used to determine the thickness and texture of the surface.

Tubular extrusion: The molten material is extruded through a matrix with a mandrel, forming a hollow section.

Extrusion of coating: This process allows the application of an outer layer of plastic on a wire or cable that leaves through the center of the matrix.

Extrusion: Through this method, it is possible to manufacture multiple layers simultaneously. It is used to apply one or more layers on top of a base material in order to obtain a series of specific properties.

Extrusion coating: It is used to make an additional layer on paper, sheets or films.