Several terms of composite materials GMT, LFT, LFRT, LFT-D, LFT-G Chinese full name translation
LF(R)T high-performance Long Fiber Reinforced Thermoplastics (BR) is a fiber-reinforced composite material that has made breakthroughs in recent years.
Including thermoplastic composite materials such as GMT, LFT-D, LFT-G
GMT (Glass Mat Reinforced Thermoplastics) is the abbreviation of glass fiber mat reinforced thermoplastic composite.
LFT-G (Long-Fiber Reinforce Thermoplastic Granules) short glass fiber thermoplastic material
LFT-D (Long-Fiber Reinforce Thermoplastic Direct)
Is a process technology for the direct production of long fiber reinforced thermoplastic composite materials online. The key factor that distinguishes it from GMT and LFT-G is that the semi-finished product step is omitted.
What is LFT
LFT is a broad term for plastics. There is an informal but customary definition in the automotive composites industry, which refers to reinforcing fibers (usually glass fibers) and thermoplastic polymers (usually polypropylene) with a length of more than 10 mm. Mixed and produced products. For example: GMT (Glass-Mat Reinforce Thermoplastic), LFT-G (Long-Fiber Reinforce Thermoplastic Granules), LFT-D (Long-Fiber Reinforce Thermoplastic)
Direct) and the like belong to the LFT category and have low density, high specific strength, high specific modulus and high impact resistance.
The mechanical properties of the LFT material are related to the material properties and proportion of the reinforcing fibers. The LFT reinforcing fiber for automobile is usually glass fiber. In theory, the proportion of the glass fiber in the product can be 10% to 80% (refer to the weight ratio), and in practice, the ratio of the glass fiber is usually 20% to 40%. In addition, the mechanical properties of the LFT are also closely related to the length of the reinforcing fibers. Compared with similar short fibers (fiber length less than 1mm) to enhance injection molding thermoplastic composites, LFT materials have been greatly improved in terms of strength, impact resistance, energy absorption rate and so on. Therefore, these characteristics have also created conditions for LFT to be applied to structural components and semi-structured parts inside and outside the vehicle, which are more demanding, and become one of the main reasons favored by the automotive industry.
Several main materials of LFT
In recent years, the performance and molding process of LFT materials have made many new developments: the more popular materials can be roughly classified into three categories - GMT, LFT-G and LFT-D; more mature molding technologies have Compression molding and injection molding, in which GMT material is compression molding, and LFT-G and LFT-D can be compression molded or injection molded, which depends on the specific technical requirements, cost, production scale and other factors of the product. select.
