The three-dimensional rounded fork geometry guarantees gentle fiber transport and results in uniform surface quality of the end product, plus longer needle service life. The optimal straightness prevents needle breakage and bending. Fork needles with a working-part diameter of up to 43 gauge and extremely small fork dimensions are specially designed for the production of ultrafine velour.
The high dimensional accuracy of the barbs and a very low, precisely maintained barb distance enable simultaneous fiber take-up during structuring. This technological advantage results in the creation of a smooth and uniform velour surface. Crown needles from Groz-Beckert reliably fulfil the highest requirements in this area, e.g. in automobile interiors.
Triangular shaped working part
The fact that the small barbs lie closely adjacent to each other means the best needling results, plus minimal damage to either fibers or carrier material. The possible variants here are: all edges occupied, or needles with barbs on only one or two edges. The triangular shaped working part is specially suited to the needling of paper-machine and filter felts. The standard working part cross section is an equilateral triangle with rounded edges – for constant stability in all directions during deflection.
Teardrop shaped working part
Compact barbs in combination with the teardrop shaped working part enable maximum gentleness where the carrier material is concerned. Due to the altered looping angle in the barb area, even more effective needling is achieved. Depending on product requirements, Groz-Beckert felting needles can be utilized with different crank positions. With just one barbed edge of an otherwise rounded working part, an extremely gentle effect is achieved on the warp and weft yarns of the base material – and needling results are excellent.
The stability of an equilateral triangular-shaped working part, and the advantage of an enhanced grip on the fiber, thanks to the concave sides of the working part, means that Groz-Beckert needles with this cross-section provide improved fiber transportation.
The working part cross section resembles an equilateral four-pointed star with corner angles of 60°. Barbs at four edges increase the efficiency during needling of geotextiles and high-density felts.
GEBECON®-SL needles and GEBECON®-XLP needles are distinctive for their higher stability in relation to conventional conical needle solutions while retaining good needle elasticity. This economical adaptation of a Groz-Beckert needle with intermediate reduced working part, meets the requirements for a wide range of applications with coarse and fine gauges.
Vario barb needle
The barbs are designed in such a way that they taper toward the point. As a result, penetration force is reduced to advantageous effect. The needle is deflected to a lesser extent and the risk of breaking is reduced accordingly. The larger barbs, positioned higher up, ensure adequate needling efficiency. Vario barb needles from Groz-Beckert are mainly used for needling every type of natural and recycled fiber material.
The conical working part smoothly passes into the reduced section or into the shank area of the felting needle. The long tapered point facilitates penetration of the nonwoven product with less resistance. These advantageous design features ensure exceptional strength, even in the processing of heavyweight materials and the subjection of the needle to high bending stresses.
The use of wear-resistant Groz-Beckert GEBEDUR® needles in heavy-duty industrial applications enables long-term constant and economical needling. Machine setup and expensive downtimes can be reduced to a minimum. The GEBEDUR® I needles are coated with titanium nitride, giving them an exceptionally high degree of surface hardness accompanied by elasticity. The secret underlying GEBEDUR® II needles is their special metallurgical treatment, which also contributes to improved wear characteristics. Additional versions are chromium-plated and nickel-plated needles.
With felting needles, barbs are used to transport fibers through the web. The size of the barbs is defined by the barb depth and kick-up, and significantly determines fiber pick-up. The undercut angle defines how well the fiber is retained by the barb. The three-dimensional design of the HL and RF barb increases the service life of felting needles considerably in comparison to those with conventional barb shapes.
Conventional barb (KV barb)
The traditionally cut barb is still in widespread use for a variety of applications. In many cases, it also represents an economical alternative to other types.
The HL barb stands for the most gentle fiber processing. The three-dimensionally rounded shape is achieved by the use of precision tools. The fibers adhere to the rounded barb area and are gently needled as a result.
The accentuated base and rounded edges of the undercut area of this efficiently shaped barb enable optimized wear characteristics, resulting in long service life.
The FB barb also has a three-dimensionally shaped contour. The efficient transport of fibers takes place over the defined surfaces in the undercut area. These two characteristics result in a uniform needling effect plus a long needle service life.