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E-glass Yarn ECD 450-1/2: Two Twisted Strands Plied
Continuous glass filament is processed much like silk and rayon: strands are twisted, then two are plied together the other way. This is yarn ECD 450-1/2 from the US glass-yarn standard MIL-Y-1140H (1972): electrical-grade (alkali-free) glass, continuous filament, fibre about 0.00023 in thick, strands of 45,000 yards per pound, one strand twisted, two plied. It is the warp and filling of style 112 glass cloth for laminates (MIL-C-9084C).
The picture: our diagram.
Intermediate
1 day
Instructions
1
1
Check the strand
Check the strand
Use alkali-free E-glass strand of D filaments (about 0.00023 in, 5.8 µm) with about 45,000 yards per pound (about 90 m per gram).
Materials for this step:
E-glass Fibre Strand1 as requiredTools needed:
Balance Scale
Rubber Gloves2
2
Twist each strand: 5.0 turns per inch, Z
Twist each strand: 5.0 turns per inch, Z
Twist single strands to 5.0 turns per inch (about 2 per cm) in the Z direction. Ours: a ring spinning frame as the twister.
Tools needed:
Ring Spinning FrameRubber Gloves3
3
Ply two: 4.4 turns per inch, S
Ply two: 4.4 turns per inch, S
Ply two twisted strands together at 4.4 turns per inch (about 1.7 per cm) in the S direction, against the twist of the singles.
Tools needed:
Ring Spinning FrameRubber Gloves4
4
Check and put up
Check and put up
The finished yarn is about 0.0074 in (0.19 mm) thick, 22,500 yards per pound (±10 %; about 45 m per gram), and breaks at no less than 2.2 lb (1.0 kg), no single test below 80 % of that. Wind it on tubes or cones.
Tools needed:
Bobbin WinderBalance ScaleMaterials
1- 1 as requiredPlaceholder
Tools Required
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