Application of Adhesives and Sealants by Extrusion Techniques

Almost all adhesives and sealants may be extruded through a hole or die or slot (Fig. 33), it is only necessary to push the product with enough pressure, and this 

When it exits from the head, die or slot, the product may be applied as beads, lines, dots or bands (Fig. 34) to get the required pattern adapted to the job and the required joint shape and thickness. 

Extrusion of Fluid Adhesives (less than 50,000 mPas) 

A simple and convenient equipment is shown on Fig. 33 and 35 it includes - a pressurised tank where the adhesive is pressurised up to a few bars. 

This system is similar to the syringe application that we have discussed previously, but the syringes are used in small applications to deliver less than 1 g per part, while the extrusion equipments are used for much larger consumptions. 

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