Cost-effective composites. (Inside, Under, Elsewhere & Otherwise).An alternative to producing long fiber thermoplastic Long fiber reinforced thermoplastics (LFRT) are one of the fastest growing materials in the polymer composites industry. Their advantages of high specific tensile properties and recyclability have enabled them to replace metals and thermoset composites in several areas of daily (LFT LFT left frontotransverse (position of the fetus).
LFT Liver function tests, see there ) composites with molding pellets or glass mat thermoplastic (GMT (Greenwich Mean Time) See UTC.
GMT - Universal Time 1 ) materials is being touted by Composite Products, Inc. (CPI; Winona, MN) as being more cost-effective in providing high-temperature stiffness for components. According to the company, adding 40% glass reinforcement to polypropylene homopolymer raises the heat distortion by 50%; adding the same amount of glass reinforcement to nylon 6 raises its heat distortion temperature by 16%.
But in order to achieve that, the company claims, the molder has a choice: using prefabricated pre·fab·ri·cate
tr.v. pre·fab·ri·cat·ed, pre·fab·ri·cat·ing, pre·fab·ri·cates
1. To manufacture (a building or section of a building, for example) in advance, especially in standard sections that can be easily shipped and glass/resin pellets or using CPI's patented direct feed thermoplastic (DFT DFT - discrete Fourier transform ) process. The direct approach, skipping the pellet manufacturing, is said to save the molder about 40% (e.g., for a 40% glass-reinforced polypropylene, the pellet material cost is said to be $1.40/lb. versus $1.00/lb. for the DFT material).
Briefly, the DFT process employs a proprietary extruder design that gently mixes the fiber/resin melt such that the reinforcing fibers aren't damaged so that they maintain a high degree of their initial length in the compounded thermoplastic composite.
One cited application of a 40% glass-filled polypropylene that's made with the DFT process is an under hood front end assembly that is used by Volvo to replace a metal part (the high resistance to heat distortion is said to be a reason why the composite can be used in this application).