Felting needles are used to mechanically bond nonwovens in needling machines. Depending on the fiber type and the required properties of the end product, different needle types are available with regard to length, shape of the working part, and distribution or consistency of the barbs.
Groz-Beckert offers four different barb shapes. The dimension and shape of the barb are of great importance for efficiency during the needling process, they are used in transporting and bonding the fibers within the nonwoven. The formation of fiber loops makes the nonwoven increasingly dense. This results in higher fiber-to-fiber friction, which ultimately determines the final strength and volume of the nonwoven, as well as all of its other mechanical properties.
With structuring needles, a distinction is made between fork needles and crown needles. Their task is to structure already-bonded nonwovens in special machines. The surfaces are given a velour or ribbed look, with geometrical or linear patterns.
To fulfil the high requirements of the most diverse applications – e.g. surface quality, tear resistance, uniformity, minimal damage to fibers and carrier material, and long service life – Felting needles are used with different working part shapes.
Working part shapes
GEBECON® felting needles from Groz-Beckert offer the ideal combination of good end product surface quality plus the best possible resistance to bending.
Fork needles have a shank with reduced thickness plus a cylindrical working part. The important functional element is the fork opening on the working part.
Crown needles are designed in the same way as felting needles. The only difference lies in the barb arrangement. Located on each edge of the working part is typically only one barb. The short distance from the tip to all three barbs is virtually identical. Formation of the loop thus takes place uniformly, resulting in a homogeneous surface.
In the felting and structuring needles sector, the Groz-Beckert product portfolio is complimented by new patented needle packaging, as well as many different types of needle removal tools.