In the European industry fiber reinforced thermoplastics have been firmly established for years for the purpose of large-scale production of structural automotive components. In particular, the newly developed LFT direct processing method has increasingly achieved its objectives due to its cost saving potential and excellent material characteristics. Dieffenbacher developed the LFT-D-Process approximately five years ago and introduces now the LFT-D-ILC Process to the market. The major difference is the separation of the matrix compounding step from the incorporation of fibers in a second twin- screw-devi ce. Usually thermoplastic polymers do not fulfill the requirements of a technical application and therefore need to be stabilized and modified. This separation allows an optimized compounding of the matrix polymer with simultaneously increased output rate of the compounding unit. High shear strength has to be introduced into the molten mixture of polymer and additives to optimize the compounding. In addition the decoupling enables the economic production of small amounts of a customized material for small volume production whereas the producer of semi finished products will not be able to provide the material because of economical reasons. ln-Line compounding systems are integrated with the molding process to deliver homogeneous long fiber reinforced compound performs at molding temperature, in complete synchronization with the demand established by a cycle time of less than 30 s. In-Line compounding systems currently in use are capable of providing five hundred kilogram per hour at a screw speed of about 500 1/min. The effect of material quality control is demonstrated and the process technology is introduced in this paper. Influences of the in-line compounding on mechanical properties are discussed.
LFT-D-ILC - innovative process technology decreases the costs of large-scale production of long-fiber-reinforced thermoplastic components
LFT-D-ILC: Innovative Verfahrenstechnik verringert die Massenherstellungskosten von langfaserverstärkten thermoplastischen Kunststoffbauteilen
2002
5 Seiten, 9 Bilder, 5 Quellen
Aufsatz (Konferenz)
Englisch
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