According to the long fibers in the plastics, they can be divided into short fiber reinforced thermoplastics (generally 0.2 to 0.4 mm in length), long fiber reinforced thermoplastics (generally more than 10 mm in length) and continuous fiber reinforced thermoplastics.

At present, long glass fiber reinforced thermoplastics, according to the classification of the process, mainly includes the following three:
1) GMT (Glass Mat Reinforced Thermoplastics), the semi-finished product is sheet material, which is laminated by Glass fiber Mat and thermoplastic (film);The final product is moulded.Another class of moulding composites that can be confusing is BMC (Bulk Molding Compounds) and SMC (Sheet Molding Compounds), both of which are mainly for thermosetting plastics. BMC is short glass fiber and SMC is long glass fiber (typically 20 to 50 mm in length).
2) LFT-D (Long Fiber Reinforced Thermoplastics Direct), without semi-finished products;Continuous fiber and plastic through the twin screw mixing, extruding sheet material, quantitative cutting, heat preservation transportation, and finally direct molding;There are also some LFT-D processes for direct injection molding.(Note: The leading equipment suppliers for LFT-D are KraussMaffei and Dieffenbacher.)
3) LFT-G (Long Fiber Reinforced Plastics Granules), semi-finished products are plastic particles with length of 10 to 25 mm, which are composed of continuous Fiber impregnated with plastic melt, pultruded and granulated;The final product is moulded (pellets about 25 mm in length) and injection moulded (pellets about 10 mm in length), of which injection moulding is the main direction.

At present, the main plastics of LFT-G include PP, PA6, PA66, PBT, TPU, PPA, PPS and so on.In the automotive industry, long fiber reinforced thermoplastics are the future of lightweight, and LFT-D and LFT-G are the fastest growing;LFT-G is suitable for injection molding and has great advantages in geometric complexity and mass production of final products.Therefore, this paper mainl

LFT-G is suitable for injection molding and has great advantages in geometric complexity and mass production of final products.In contrast to short fibers, long fibers can form a 3D fiber network in the production of plastic products, making the final product with high hardness and toughness, including: high surface quality, high mechanical strength (high temperature resistance), impact resistance, fatigue resistance, low creep, low shrinkage, low warpage and low friction loss, etc.In fact, long fiber reinforced plastics are more isotropic than short fiber for injection molding products

In automotive, aviation, sports and other industries, when considering lightweight and high-performance products, long fiber reinforced thermoplastics have certain advantages in strength, dimensional stability and long-term use.This paper is only for some commercial different plastic types, different types of fiber, fiber length and content of the material to do a brief introduction, hope that the subsequent users in the material selection, can comprehensively compare the processing performance and use performance of different materials, to make the best design and choice.

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