Needle punching technique by Vignesh Dhanabalan

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.
vigneshdhanabalan@hotmail.com

Principle of Needlepunching Process

Effect of Needle penetration

Parts of Needle and Type

Fibre Parameters
– Fibre Type (Natural or Synthetic)
– Linear density or denier
– Length
– Crimp level
– Tensile Properties
– Cross-sectional Shape
– Surface Finish

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

Effect of Needle Penetration

Effect of Needle Penetration (Cont.)

Effect of Needle Penetration on Fabric
Properties
Needle
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 44
1/2 195 0.047 0.68 0.71 35
5/8 160 0.043 0.74 0.66 30
3/4 160 0.043 0.59 0.45 30

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.

Punching Force
The 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.

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 (NbT)
– 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

Needle punching technique by Vignesh Dhanabalan

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