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This article summarizes the comparison between the preparation,structure and mechanical properties of long fiber reinforced thermoplastics(LFT) and short fiber reinforced thermoplastics(SFT).Both of the experiment and theory results showed that the mechanical properties of long glass fiber reinforced thermoplastics pellets(LGFRT) have been enhanced better than that of short glass fiber reinforced thermoplastics pellets(SGFRT) manufactured by molding procession.After regulation of the relative humidity by 50%,the mechanical properties of 30%(weight percent) short glass fiber content in SFT(SFT-PA6-SGF30) are similar to that of 40%long glass fiber content in LFT.However, the density of the latter is about 17%lower than that of the former.Thus,the corresponding weight of products is reduced by 13%;output rate is increased by 21%,and the cost is therefore significantly lowered.And it has the following advantages;impact strength is increased by 87%;the proportion is reduced by 20%;molding cycle is shortened by 10%;materials cost is saved by 20%~ 30%and the final total cost is saved by 30%~ 40%.So LFT (LFT-PP-LGF40 ) can replace SFT(SFT-PA6-SGF30) with the similar basic mechanical properties under normal temperature or 160℃lower.
This article summarizes the comparison between the preparation, structure and mechanical properties of long fiber reinforced thermoplastics (LFT) and short fiber reinforced thermoplastics (SFT) .Both of the experiment and theory results showed that mechanical properties of long glass fiber reinforced thermoplastics pellets ( LGFRT) have been enhanced better than that of short glass fiber reinforced thermoplastics pellets (SGFRT) manufactured by molding procession. After regulation of the relative humidity by 50%, the mechanical properties of 30% (weight percent) short glass fiber content in SFT ( SFT-PA6-SGF30) are similar to that of 40% long glass fiber content in LFT.However, the density of the latter is about 17% lower than that of the former.Thus, the corresponding weight of products is reduced by 13% ; output rate is increased by 21%, and the cost is less significantly decreased. And it has the following advantages; impact strength is increased by 87%; proportion is reduced by 20%; molding c (LFT-PP-LGF40) can replace SFT (SFT-PA6-SGF30) by replacing 30% ~ 40% with the similar basic mechanical properties under normal temperature or 160 ° C lower.