see also
Pultruded Profiles
» The process
» Aplications
» Characteristics
» Mechanical Properties
» Profile List
» Hand Rails
» Stairs
» Vertical Ladders
» Walkways
» Structures
Grating / Safety Foor
Coverings GRFP
Moulded Pieces
The process

Pultrusion is the given name to the automatic process of continuous production of constant section products, being the major part of these products profiles and tubes. This process is applied exclusively to composite materials.

The process may be compared to conventional extrusion; the difference is that the force used to make the material go thru the spinner is applied after this one, thru a traction system that grabs the profile, while on extrusion the force is applied before the spinner.

As pultrusion is a continuous process, benefits of advantages from the process efficiency and effective control, resulting in uniform properties and good dimensional tolerance. Also, as a result of the continuous process, it may be manufactured profiles of any size, having as single limitation the profiles transportation. Is also usual to produce profile rolls of small section, this way is possible to have a few miles of length, what makes the transportation easier. It is possible to produce any section, which may be very even and very bright, although this kind of finish isn’t usual request for industrial application.

Pultrusion is one of the greatest processes of glassfiber reinforced plastics (GRP), although other types of resins may also be used, such as carbon fiber and aramid fiber (KevlarÒ). This process has been developed according to the needs of structure plastics with both high mechanical and physics properties – composites that may compete with traditional engineering materials (steel, aluminum). This process allows to obtain profiles of many and complex sections, some of them impossible to obtain in metallic profiles.

The pultrusion process consists, in general, on the drag of continuous fibers (roving), cloth and / or continuous fabrics. These are impregnated on a resin bath, followed by a system of guidance and control, where’s removed the resin excess and is given conformation to the fibers, so these can have the approximate shape of the producing section. These pass right away thru a warmed spinner with the profile section shape and where the composite is cured. The materials are conformed and cured with the progression of the section thru the warmed part of the tool. The progression of the profile is done thru a traction system which allows the continuous movement and controls the production speed.

The production speed is controlled so that the cure is done completely during the time the product remains on the spinner. This is necessary so that the material gains the resistance needed to sustain the used force during the traction phase. After passing the traction system, there’s a cutting system where the profiles are cut on the desired length.

© Copyright 2009 Alto - perfis pultrudidos, Lda - All rights reserved Developed by:4por4