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I'd like to ask you, how to determine number of rovings for pultruded profile. I know the surface of pultruded profile, the diameter of one fiber is 16 micrometers. How many fiber is in one roving usually? In composit will be cca 70% of glass fibers, 30% of resin. Could you help me? It is...

But there is difference between torque on empty screw and fully filled, because material is braking rotation of screw, and torque has to be higer. So there has to be involved some material and processing characteristics.

But I would need something, where temperature, pressure and heat is involved.

It is known some formula for screw torque calculation during extrusion? I'm looking for this for longer time. Thank you

What is the right vent port position in vacuum extruder? I'm going to use barrier ring in front of degassing section. I suppose, 2D should be enough distance between barrier ring and vent port. Or it should be closer? It is 120mm extruder, and vent port dimensions are L=1D, W=0,5D. Thank you...

Thank you. We will see. I'm going to order vacuum pump with liquid ring with suction power upto 15-20m3/h and pressure max. 100mBar. I hope, it's a good choice.

Could somebody help me, how to calculate optimal suction power of vacuum pump for rubber blend degassing. It is 120mm extruder, common rubber blends on the base of NR, IR, SBR and carbon black filled. Thank you.