Felting needles – Needling technology
The bonding of nonwovens can take place thermally, chemically or mechanically, and also with the help of felting needles.
In the mechanical-bonding method the fibers are transported by slotted felting needles and incorporated into the nonwoven. This increases the frictional forces between the fibers and makes the nonwoven more rigid.
There are many felting needles in the needle board of a needling machine. They are led through the nonwoven by moving up and down. Groz-Beckert offers various high-performing felting needles.
In order to meet the high requirements of the various applications –
with regard to surface finish, tensile strength, uniformity, low damage to fiber and carrier material as well as service life – felting needles with different working-part shapes for different features are available.
The standard triangle is universally applicable and achieves high surface quality.
The vario-barb needle features reduced force when penetrating into the product, high stability and good needling effects – achieved by the successively larger barbs.
Compared to standard working parts, the advantages of felting needles with conical working part lie in particular in increased stability.
GEBECON® felting needles provide the ideal combination of good surface finish in the end product and the best possible bending properties.
Cross STAR felting needles are especially suited to the needle punching of high specific weights. They achieve uniform material properties and high longitudinal and transverse tensile strength.
Tri STAR® felting needles are distinguished by concave working-part surfaces and tighter edge angles. These achieve a defined fiber enlacement and better fiber hold on the barb.
Technical problem areas, such as the manufacture of paper-machine felt and filter felt, require very gentle needling of the product. Tear-drop-shaped working parts provide ideal prerequisites.
The EcoStar® felting needle boasts entirely new working-part geometry which can be used in almost all applications.
The Twisted felting needle with twisted working part is particularly suited to the manufacture of end products with high tensile strength.
Groz-Beckert provides a wide variety of services for machine builders and manufacturers of nonwovens.more on services
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