Extrusion of synthetic fibres
Synthetic fibres are fibres deriving from non-natural material and are produced by means of chemical processes. The most common of these are polyamide (Nylon), polyester and polypropylene. These fibres are produced by spinning synthetic polymers obtained from organic matter polymerization reactions.
In the “synthesis” stage, the molecules are associated to each other through chemical polymerization reactions, creating solid materials (grains or chips) that can be easily transported for subsequent processing.
To obtain synthetic fibres, these solid materials must be made liquid, either through fusion or by being made soluble in appropriate solvents, and then extruded.
Once extruded, the filaments making up the fibres undergo further bleaching treatment, washing and finally packaging.
The polymers that have been made liquid are extruded in the spinning stage, passing through spinnerets, whose inner heads have filtering discs. Passing through the filtering discs, the extruded material takes the shape of filaments to then be transferred to the next processing stages. The filtering disc openings vary according to the diameter of the thread to be obtained.
Costacurta typically supplies filtering discs that are already complete with edging and surface treatment on the client’s request.
Distinctive characteristics of the Costacurta filtering discs for extruders are:
- High quality of the material used and the production process
- Quality of the finished product thanks to the meticulous quality controls on the cloths used and the dimensions of the filtering disc, the cleaning process of the filtering disc and the packaging designed to ensure the filtering disc remains clean until it is used.