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What are the main requirements on PP resin in LFT process?
PP resin with better flowability is required. If the melt flowability rate is too low, the mechanical properties are optimized while the flowability will be bad; if the melt flowability is too high, the mechanical properties will be compromised. So it is vital to choose the proper PP resin. It is recommended that the melt flowability rate should be 50-80g/min.
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Can LFT products be used in external unwinding process?
Yes. For example, 352A is now used by many of our customers in external unwinding process. 352A with an inside paper roll can be directly used by placing it on the equipment.
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What’s the difference between 386 and 386T?
386 is Jushi’s older product, which is compatible with multiple resin systems and is suited in the process of filament winding, weaving, and pultrusion.386T is launched on the basis of E6 glass while maintaining the sizing system of 386. The excellent properties of E6, such as high strength, high modulus, and excellent chemical corrosion resistance, offers 386T a performance improvement when compared with 386. -
As for the SMC roving, what’s the difference between 440, 442, 458A, 440A, 456, and 410?
440: A kind of general purpose Assembled Roving for SMC is mainly used to produce large structural parts such as automotive headliner;442: Mainly used in manufacture of pigmentable SMC product with high surface quality, such as ceiling tile. Low LOI content; suitable for Asian markets;458A: Mainly used in manufacture of pigmentable SMC product with high surface quality, such as bathtub; High LOI content; Mainly for North American markets;440A: Assembled roving especially designed for automotive headliner. It is not recommended to use 440A in SMC processes.456: Suitable to manufacture Class A SMC product.410: Excellent hydrolysis resistance, mainly for manufacture of SMC bathroom fixtures, such as bathtub, enclosure panels, etc; mainly for Japan market; -
As for the roving for Hobas pipe, what’s the difference between 622 and 622A?
622: Fast wet-out, and low resin absorption;622A: Fast wet-out, excellent acid resistance, consistent color of the finished composite product. -
As for Assembled Roving for Spray-up, what’s the difference between 178, 180, 170, and 172?
178: is designed for high speed robotic spray-up process. The filament diameter is 11 um. It is easy to process with low tension and no spring-back in sharp corner;180 is spray-up roving for general purpose, which is more suited in composite products with less sharp corners. The filament diameter is 13 um.Both 178 and 180 deliver fast wet-out and are mainly for North America and Asian markets.170, with filament diameter of 13 um, is ideal for products with large vertical surface; 172, with filament diameter of 12 um, delivers benefits of small dispersion area during spray-up, little fiber swap, suited for small parts.Both 170 and 172 are for European and South American markets. -
As for Panel Roving, what’s the difference between 872S, 838, 872, and 528?
838: low static, fast wet-out, no white fiber, moderate transparency872: fast wet-out, no white fiber, high transparency, but during processing the static should be removed, and there will be a small amount of fuzz.872S: low static, moderate wet out, excellent dispersion of the chopped strands under low tension, and is suitable for use in both translucent and opaque panel applications.528：low static, moderate wet-out, and is suited to produce mat for transparent panel applications. -
Do you have a product which can increase the fiber content without impact on the BMC viscosity in the finished articles?
Yes, we have the exact product satisfying your requirements. 562E has extremely low resin demand/ absorption, and no affect on the viscosity of BMC paste. It is used to manufacture products with complex structure, as well as products with high glass content, even exceeding 40%.
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As for the BMC products, what are the criteria for selecting the length of chopped strands?
It mainly depends on the end application products. In general, when the chopped length is between 3 mm and 13 mm, the tensile strength will increase as the chopped length increases. If the chopped length exceeds 13mm, the strength will start to decrease. What’s more, if the end products are for decoration purpose and the surface quality is the major concern, we recommend shorter chopped length.
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How will the chopping length of chopped strands for TP reinforcement affect the performance of composite materials?
There are two specifications for chopped strands: 3mm and 4.5mm. The 3mm strands show a slight advantage in terms of density and flowability, however, customers find that this advantage is not apparent in practical operation.Both 3mm and 4.5mm chopped stands meet the requirements of processing, ensuring a smooth production line. Through testing of retention length of extruded pellets, we find that the retention length of 4.5mm chopped strands is a little greater than 3 mm ones, thus offering better reinforcement property. An obvious advantage of 4.5mm chopped strands is extremely low fuzz, suitable for continuous production for extended periods. For the moment, 4mm or 4.5mm chopped strands are available in international markets, while 4.5mm strands are increasingly used in domestic markets. We recommend the 4.5mm Chopped Strands for Thermoplastic.
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