Post on 14-Apr-2017
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Needle punching Process
A physical method of mechanically interlocking
fiber webs by using barbed needles to
reposition some of the fibers from a horizontal
to a vertical orientation.
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Principle of Needlepunching Process
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Effect of Needle penetration
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Parts of Needle and Type
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Types of needles
Fibre Parameters
– Fibre Type (Natural or Synthetic)
– Linear density or denier
– Length
– Crimp level
– Tensile Properties
– Cross-sectional Shape
– Surface Finishvigneshdhanabalan@hotmail.com
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Web Parameters
– Web area density
– Thickness
– Orientation of fibres
– Web type
Needle Penetration
Depth of barb penetration is defined as the longest distance that the first barb travels below the lower surface of the web
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Effect of Needle Penetration
Effect of Needle Penetration (Cont.)
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Effect of Needle Penetration on Fabric PropertiesNeedle Penetration (in.)
Fabric Weight (g/m2)
Fabric Density (g/cm3)
Initial Modulus (g/tex)
Tenacity (g/tex)
Breaking Extension (%)
1/8 230 0.042 0.3 0.25 45
1/4 240 0.044 0.42 0.40 43
3/8 195 0.046 0.55 0.50 441/2 195 0.047 0.68 0.71 355/8 160 0.043 0.74 0.66 30
3/4 160 0.043 0.59 0.45 30
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Needlepunching Process Parameters
– Arrangement of needles in needle-board
– Effective length of needle-board
– Punch density
– Depth of needle penetration
– Diameter of the holes in stripper and bed plates
– Distance between the two plates at entrance and exit
Direction of Needling
– Passing the same side of the web and second by feeding
alternating sides of the web in consecutive passes.
– Alternating the side of the web facing the needles caused
less fibre breakage.
– Fibre stress caused by the previous needling pass was
superimposed by the subsequent pass.
– Significant strength reduction.
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Punching ForceThe force which is generated as a result of the resistance offered by the fibres being transported (reoriented) by the penetrating barbs is defined as Punching Force.
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Punch density
– The density of needles in the needle board (Nd)
– The rate of material feed
– The frequency of punching
– The effective width of the needle board (Nb T)
– The number of runs
– n= number of needles within a needleboard
– F = frequency of punching
– V = rate of material feed
– W = effective width of the needle board
Edpass = [n*F] / [V*W]
Applications– Shoe felts – Blankets– Automotive insulation– Carpet backing– Wall coverings– Composites– Geo textiles– Felts– Padding– Filters
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