LFT – development status and perspectives

Schemme, Michael

doi:10.1016/s0034-3617(08)70036-5

Cited by 46 publications

(42 citation statements)

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“…These material properties match stamping method. Long Fiber ThermoplasticDirect (LFT-D) method has been developed for achieving one minute manufacturing of thermoplastic CFRP [2,3]. Procedure of LFT-D consists of making compound in mixing extruder, heating compound, stamping, cooling and ejecting thermoplastic CFRP from mold [4,5].…”

Section: Introductionmentioning

confidence: 99%

Effect of Nano-Texturing on Adhesion of Thermoplastic Resin against Textured Steel Plate

2016

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Long Fiber Thermoplastic-Direct (LFT-D), a new stamping method, has been developed to achieve the short cycle-time manufacturing of Carbon-Fiber-Reinforced thermoplastics (thermoplastic CFRP). In LFT-D method, to shorten cooling time is one of the effective way for achieving more productive manufacturing. During ejection sequence in the LFT-D, thermoplastic resin parts adhere stronger than previous method. High adhesion affects smoothness of the component surface, cycle-time and requested specifications of equipment. So, it is required to reduce the adhesion between the metal mold and thermoplastic resin. This paper reports the effect of nano-texturing on adhesion of thermoplastic resin against the textured steel around glassy-transition temperature. Experimental results show that the adhesion strength increases proportionally with the ratio of contact area. The lowest adhesion strength on nano-textured surface is 0.18 MPa, which is 66% lower than that of flat surface. It is clarified that surface adhesion energy increases with the ratio of contact area A contact to circumference of contact area L circumference .

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Section: Introductionmentioning

confidence: 99%

Effect of Nano-Texturing on Adhesion of Thermoplastic Resin against Textured Steel Plate

2016

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“…The injection molding processing of long-fiberreinforced thermoplastics (LFT) is carried out either by standard injection molding using semi-finished granulates (LFT-G) or direct processes (LFT-D) in injection molding compounding (IMC) [1]. By combining these processes with foam injection molding (FIM), long-fiber-reinforced foams with compact skin layers and a foamed core can be produced in-situ in the mold as a single material system.…”

Section: Introductionmentioning

confidence: 99%

“…Special coupling agents enable values of up to 0.9 mm to be achieved [2,3]. The material combination polypropylene / glass fibers is the most common in LFT applications due to its good price / performance ratio [1,2]. Investigations into this material system show that the average fiber length has a significant influence on the mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…1 mm is sufficient to achieve the target of 95% of theoretical maximum stiffness (modulus). In order to increase the performance potential of an LFT material in terms of strength and in particular impact resistance, medium fiber lengths of around 8-10 mm or at least 40 mm are needed [4,1]. This means that for LFT processing the objective must be to preserve the fibers during the plastification and injection, resulting in preferably long fibers in the final molded part.…”

Section: Introductionmentioning

confidence: 99%

“…Shear and elongational flows generate an anisotropic component in which the main fiber orientation (and therefore the mechanical properties) depends strongly on the orientation to the flow direction and furthermore on the flow path [2,3]. The injection molding of LFT compounds is either carried out on the basis of semi-finished products through the use of long-fiber-reinforced granulates (LFT-G), or in so-called direct processes (LFT-D) [1]. LFT-G are unidirectional glass fiber strands which have been impregnated and consolidated with a thermoplastic polymer, and which are generally produced via pultrusion with lengths of 10 mm (standard) to about 25 mm.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

LFT foam - Lightweight potential for semi-structural components through the use of long-glass-fiber-reinforced thermoplastic foams

Roch¹,

Huber²,

Henning³

et al. 2014

AIP Conference Proceedings

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Effects of A, B, and S components on fiber length distribution, mechanical, and impact properties of carbon fiber/ABS composites produced by different processing methods

Lee

Cho

2021

J of Applied Polymer Sci

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Carbon fiber/ABS composites with different acrylonitrile, butadiene, and styrene components were produced via extrusion/injection and long fiber thermoplastic (LFT)/injection molding processes, respectively. The effect of the components on fiber length distribution, tensile, flexural, impact, and dynamic mechanical properties of the composites was investigated. The properties of carbon fiber/ABS composites produced using 12 mm‐long LFT pellets were markedly higher than those produced using extruded pellets made with 12 mm‐long chopped carbon fibers. Uses of LFT pellets were preferable to enhancing the mechanical properties of carbon fiber/ABS composites. The tensile, flexural, and dynamic mechanical properties were increased in order of ABS750sw > ABS720 ≥ ABS780 > ABS740, whereas the impact strength was increased in order of ABS740 > ABS780 > ABS720 ≈ ABS750sw. Less carbon fiber damages and less carbon fiber length degradation upon LFT processing resulted in longer fiber length distribution and higher fiber aspect ratio in the composites with LFT pellets, indicating a beneficial reinforcing effect, which was responsible for the increased mechanical properties of ABS composites, particularly with ABS750sw. The results were agreed with each other, significantly depending on the A, B, and S components, being supported by fiber length distribution, fiber aspect ratio, and fracture surfaces.

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LFT – development status and perspectives

Cited by 46 publications

References 0 publications

Effect of Nano-Texturing on Adhesion of Thermoplastic Resin against Textured Steel Plate

Effect of Nano-Texturing on Adhesion of Thermoplastic Resin against Textured Steel Plate

LFT foam - Lightweight potential for semi-structural components through the use of long-glass-fiber-reinforced thermoplastic foams

Effects of A, B, and S components on fiber length distribution, mechanical, and impact properties of carbon fiber/ABS composites produced by different processing methods

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