Processing Machinery
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PARA Screw Speed and Glass Fiber
Problem Phenomenon
Too-high PARA screw speed damages glass fibers, destroys the interface state, aggravates floating fibers, and causes uneven strength.
Cause Analysis
When plasticizing glass fiber reinforced plastic, the screw speed should not be too high, to avoid excessive friction shear force damaging the glass fibers, destroying the interface state of the glass fiber surface, reducing the bonding strength between glass fiber and resin, and aggravating floating fibers; when glass fibers are long, some break and become uneven in length.
Solution
①Control screw speed in the low-speed range of 3~10m/min; ②Avoid excessive speed to protect glass fibers; ③Back pressure at a low level of 0~10bar; ④Glass fiber length retention verification.
Key Takeaway
PARA screw low-speed management protects glass fiber integrity; 3~10m/min is quantitative guidance; interface state determines the reinforcement effect.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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