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LFT-G (Long Fiber Thermoplastic – Granules) is a continuous extrusion compounding technology used to produce long glass fiber or carbon fiber reinforced thermoplastic pellets.
Unlike short-fiber compounding, LFT-G maintains fiber length typically 5–25 mm, significantly improving impact strength, stiffness, and structural performance.
The LFT-G extrusion line integrates fiber impregnation, compounding, cooling, and pelletizing into one continuous automated process.
Technology Introduction
Long fiber reinforced thermoplastic material is referred to as “LFT”, which can be subdivided into: LFT-G, LFT-D, etc.
LFT-G complete set of equipment features in the structure optimization and automatic process control technology of die head, which has the characteristics of high infiltration degree, small fiber damage, stable and controllable process and high production efficiency.
The production line is suitable for PP, PA, PEEK,PET, PPA, PBT and other thermoplastics.
Suitable reinforcement fiber: glass fiber, carbon fiber, basalt fiber, etc.
The fiber content is 30%, 40%, 50%, 60% controllable.It can meet the needs of different customers.
Unwinding of fiber rovings can be selected: inside unwinding and outside unwinding.
Suitable Materials
Matrix Resins:PP (most common)、PA、PEEK、PBT、PET、TPU、PPS
Reinforcements:Glass Fiber (most common)、Carbon Fiber、Basalt Fiber
LFT-G Glass Fiber
Because no pre-tensioning force is applied to the fiber, the biggest advantage is that it can greatly increase the fiber release speed andreduce the fiber breakage rate, Our biggest advantage is that we have an independently developed control system for twisting the fibers, achieving a twist rate of over 95%.
LFT-G Carbon Fiber
For LFT-G carbon fiber, outside fiber unwinding is provided. In this way,fiber twisting does not occur when glass fiber is moving.
The Complete Equipment Process Flow Chart
1. Feeding system
2. Loss in weight feeder
3. Twin screw extruder
4. Inside fiber unwinding
5. Glass fiber pretreatment system
6. Impregnation and coating mold
7. Cooling water tank
8. Strand shaping
9. Blower
10. Strand arranging
11. Hauling machine
12.Special granulator
13. Vibrating screen
Die Head Design
When designing the die head, we need to consider impregnation, improve infiltration degree, reduce fracture rate, avoid degradation and improve efficiency etc. Specific requirements will be discussed with potential customers.
Fiber Unwinding
Inside fiber unwinding is provided for LFT-G glass fiber, and outside fiber unwinding is provided for LFT-G carbon fiber.
Pre-treatment of Fiber
If the fiber is pre-stretched before entering the die head, the impregnation efficiency of the die head will be greatly improved.For this, we have developed a long fiber pretreatment device, and at the same time, the pre- stretch width can be adjusted according to different fibers.
The second function of the fiber pre-treatment device is to preheat the fiber. The purpose is to give the surface of the fiber atemperature dlose to the melt material, to prevent the cold material from rapidly cooling after the cold fiber enters the diehead, which increases the probability of fiber breakage and affects the fiber infiltration efficiency.
Characteristics of LFT - G
1.Bending and tensile strength increased by about 100%-300%.
2.Impact resistance increased by 2-3 times.
3.Excellent high-temperature creep resistance, high impact strength at low temperature, suitable for high and low
4.temperature alternating frequent occasions.
5.High size accuracy, small deformation, vertical and horizontal shrinkage rate is smalland consistent.
6.Simple molding, good fatigue resistance, good molding performance.
7.Low warp, little glass fiber exposure, good surface performance.
8.Recycling, green environmental protection.
LFT-GF/PP Performance Analysis
LFT-CF/PA6 Performance Analysis
Technical Parameters
| Model | CBLFT-6 | CBLFT-12 | CBLFT-24 | CBLFT-48 | CBLFT-72 |
| Number of fibers | 6 | 12 | 24 | 48 | 72 |
| Output（kg/h） | 25~80 | 60~160 | 120~300 | 225~600 | 400~1000 |
| Fiber content | 30%、40%、50%、60% | ||||
| Fiber release speed（m/min）） | 5~40 | ||||
| Pelleting length（mm） | 6~25 | ||||
LFT-G vs Short Fiber Compounds
| Feature | LFT-G | Short Fiber |
| Fiber Length | 5–25 mm | <1 mm |
| Impact Strength | Very High | Medium |
| Structural Use | Yes | Limited |
| Metal Replacement | Suitable | Limited |
Applications
LFT-G (Long Fiber Reinforced Thermoplastic – Granules) materials are widely used in applications that require high strength, impact resistance, and lightweight performance.
