http://www.mpi.co.jp DIALEAD How to handle High Modulus Carbon Fiber DIALEAD  1 For obtaining more stable process control We strongly recommend, 1.Despooling angle should be as much as small, less than 10 degree. 2.Despooling tension should be lower than 500g/spool. 3.Use the "Sand blasted Hard chrome plating bar" of 3-7S grade for guide bar. 4.Diameter of guide is recommended as larger than 30mm, 34mm is our standard. Despooling condition Sand blasted Hard chrome plating bar P/P, F/W, etc. Fuzz growth Guide bars CF bobbins Fiber Breakage Rollers 2 Factors of fiber breakage and fuzz Contact angle Tension Despooling tension Despooling angle Eyelet Carbon fiber bobbin Fiber breakage 1. Despooling tension 2. Despooling angle Diameter Surface Thread guide bar Fuzz growth 1. Thread guide bar surface 2. Thread guide bar diameter 3. Tension 4. Contact angle 3 Creel stand layout and bobbin set up 1））Despooling angle 2））First contact Guide Not recommendable layout Eyelet ＜10 degree Recommendable layout Key .points 1) Despooling angle ＜10 degree 2) Skip three bars near bobbin and pass to the forth bar. 4 5 Despooling tension Fiber breaks at unspooling process Tension 450 Unspooling Tension ［g/spool］ Angle 400 350 300 250 200 150 100 6 8 10 Recommend condition 12 14 16 18 20 22 24 26 28 Unspooling Angle ［°］ No Fiber Breackage Fiber Breackage Tension meter Key points 1) Despool tension should be ＜ 500g/spool 30 32 34 Guide bar and Guide Comb Contact angle 6 Comb (2R) > 10mm diameter θ Guide Bar Guide bar (2R) > 30mm diameter Condition Contact Angle Tension Recommendable Thread Guide Diameter Recommendable Thread Guide Surface < 30° ° < 1000g >φ φ10mm 3 to 10μ μm < 30° ° < 2000g >φ φ20mm 3 to 10μ μm < 60° ° < 1000g >φ φ20mm 3 to 10μ μm < 60° ° < 2000g >φ φ30mm 3 to 10μ μm 7 Thread Guide Bar Recommend Surface condition of thread guide bar Carbon fiber Sand blasted – Hard chrome plating bar (Rmax 5μm) Guide bar Carbon fiber Mirror surface bar (Rmax 0.5μm) Guide bar Ceramic bar (Rmax 5μm) Guide bar Sand blasted－ Hard chrome plating guide bar Due to lower contact area, fuzz doesn’t grow on the guide bar. Key points ・Sand blasted-Hard chrome plating ・Surface roughness Rmax＝3～10μm ・Diameter > 30mm our standard is 34mm Eyelet guide 8 Recommendable guide Sand blasted - Hard chrome plating Surface roughness Rmax=３～ Rmax=３～１０μ １０μm ≧１５ｍｍ ≧１５ｍｍ ≧Ｒ１５ ≒３０ｍｍ ≒３０ｍｍ Key points ・Sand blasted-Hard chrome plating ・Surface roughness Rmax＝3～10μm ・Curvature of contact Surface area ≧R15 http://www.mpi.co.jp DIALEAD Please feel free to contact us if you’d like our support on DIALEAD Carbon Fiber Products Dep. Tel.+81-3-6748-7357, Fax.+81-3-3286-1341 9