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Have Strong Fibre-Reinforced Profiles With Pultrusions

Sep 25th 2015 at 10:01 PM


It is a conventional processing technique used in many industries to a great extent. Pultrusion consists of two words - 'extrusion' and 'pull'. Extrusion is pushing materials like aluminum while pultrusion is pulling materials like resin and fibreglass.

Historical Background of the Technique:

W. Brant Goldsworthy, the "father of composites" had developed this process in the year 1954. This pioneer of fibre composite technology had provided an elaborate description of this relevant process to the professional circles in United States. This process is ideal for making profiles of hammer handles, fishing rods, vaulting poles, ski poles and so on. Corresponding to this, Ernst Kuhne too developed the method of pultrusion in 1950. He successfully produced the first product by employing this technology without external intrusion.

Other countries also started using the technique for creating pultruded profiles featuring the strength of glass fibre. In this regard, vertical and horizontal approach came into existence. With the help of vertical approach, industries developed a huge array of profile cross-sections. However, the entire process has undergone a lot of diversification in the last few years.

A Quick Review of Pultrusion Method:

The whole process begins with creels or racks that hold fiber mat rolls or doffs of fibre roving. Usually, fibreglass serves the purpose of reinforcement, but aramid, carbon or their mixture can very well serve the purpose. After pulling out the raw fibre from the racks, they pass through a resin impregnation system or resin bath. Some pultrusion systems even inject resin straight in the die. Resin, in its raw form, acts as thermosetting resin and might at times combined with pigments, catalysts and fillers.

Make sure that the resin mixture completely saturates the fibre filaments so that fibre reinforcement is totally wet. When raw resin comes out of resin impregnation system, this material passes through line of customized tooling that assists in organizing and arranging the fibres in their proper shapes. The extra resins get squeezed out. This step of tooling is 'pre-former'. Surface veils and continued strand mat added to the product in this tooling step boost up surface finishing and structure.

After removal of extra resin and organization of impregnated fibre, it passes through hot steel die. Now, the profile that comes out of the die is the pultruded FRP or Fiber Reinforced Polymer. These final products, so obtained from pultrusions, get ready for distribution in the market.

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