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Figure 10:
The Conical Blade
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The Conical Blade
As Figure 10 illustrates, the Conical Blade is produced so that the entire working blade is tapered from the smallest diameter at the point to the largest diameter at the shank or the intermediate portion. The Conical Blade is designed for certain felting situations that place large levels of stress and strain on the needle’s blade section, which can cause varying amounts of needle breakage.
The Conical Blade shape allows the smallest diameter to more easily penetrate the web. Then, as resistance increases, the heavier portion has entered the web. The heavier diameter section of the Conical Blade will better withstand the stresses and penetration resistances, thus preventing excessive needle breakage.
The triangular blade Conical has proved successful in paddings, waddings and underlay fabrics made with recycled and regenerated fibers. These fabrics can employ varying amounts of deniers, fiber lengths and fiber types. When this is combined with some amounts of unshredded fabric pieces, a higher amount of breakage will occur to those needles that are not of the Conical design. Another design, the Pinch Blade Conical, has been successful in the production of various technical felts, including geotextiles and synthetic leather.
Of course, Conical Blade needles are not ideal for all applications. They can result in a more visible needle pattern on the fabric surface due to the greater thickness at the top of the blade.
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