COMPOUNDING Extruders and extrusion lines

COMPOUNDING – HIGH THROUGHPUTS IN THE BEST QUALITY TYPICAL COMPOUNDING TASKS INCLUDE: ↗ reinforcing polymers, e.g. by incorporating glass, carbon or natural fibers ↗ improving the dimensional stability and breaking strength of polymers, e.g. by incorporating inorganic fillers, glass beads Focus on material characteristics Compounding is a process in which the polymer is melted and mixed with e.g. additives, fillers or reinforcing materials. This process changes the physical, thermal, electrical or aesthetic properties (conductivity, flame resistance, wear resistance, color etc.) of the polymer....

INCORPORATING FILLERS Example of a formulation: 70 - 80% CaCO₃ + 18 - 30% polyolefins + 0 - 2% additives It’s all about good dispersion Line layout: Fillers are added to polymers to improve their properties and/or reduce the price of the compound. The good incorporation options for fillers in the polymer matrix are used in a wide variety of applications, such as the manufacture of computer cases. Another example: drain pipes. The filler is used here as sound insulation so that flushing noises cannot be heard in apartment buildings, for example. Leistritz extruders are able to incorporate a very...

REINFORCING COMPOUNDS Break resistant and stiff Particularly for applications requiring properties such as strength and stiffness, the polymer (e.g. PP or PA) is reinforced with materials such as glass fibers, carbon fibers, and also natural fibers. The filler content of PP with glass fibers, for example, can be up to 60% depending on the application. The addition and combination of the polymer chains to and with the fiber structures creates a very strong bond that matches, and sometimes even exceeds the properties of metallic materials. Their low weight make reinforced thermoplastic materials...

THERMOPLASTIC ELASTOMERS POLYMER BLENDS Elastic, pliable, flexible Cost efficient and performance-optimized Thermoplastic elastomers (TPE) are materials in which elastic polymer chains are incorporated in a thermoplastic material. They can be processed in a purely physical process through the use of high shearing forces, exposure to heat and subsequent cooling. They can be melted and shaped by heating again. A number of TPEs exist that differ greatly in both their polymer structure and their properties. Their common feature is the basic structure in the form of block polymers in which the elastomer...

EXTRUSION LINE FOR HIGHLY FILLED COMPOUNDS High engineering competence High-tech compounding plant for highly filled compounds Process engineering concept: The art of producing highly filled compounds lies in the optimum distribution of the material streams. Great process engineering expertise is required to incorporate large quantities of fillers in the most homogeneous way in a polymer matrix. The air streams brought in with the material feeding in particular have to be controlled. A further challenge is posed by the material moisture, which may complicate the process. Accordingly, the processing...

LARGE-SCALE COMPOUNDING FOR PP STABILIZATION Competent system supplier Task: design, planning and construction of a large-scale compounding plant (climate zone from -40 – +40 °C). Panorama view of the overall plant Plant concept: ↗ material supply in a nitrogen atmosphere from a reactor ↗ mixing and supply silos ↗ dosing units ↗ extrusion line with a ZSE 180 MAXX twin screw extruder ↗ gear pump and screen changer ↗ bagging station with subsequent palletless palletizing ↗ control with integrated online rheometer Process engineering concept: PP is produced in the upstream polymerization plant....

SIDE FEEDING SIDE DEGASSINGEasy material feed - modular adjustmentReliable degassing of volatile substances The side feeder is mostly used to add powders. Leistritz can offer the right side feeder for every application and all extruder sizes. The LSB XX series convinces through the high OD/ID ratio (2.0) of the screws and can also convey materials with very low bulk densities. ^ segmented screws can be used (configuration according to the needs of the raw material) ^ adaption of the LSB XX to the extruder with tie rods (LSB XX can be fastened to the extruder barrel in the cold, easily accessible...

EXTRUSION TECHNOLOGY Available for you all over the world Leistritz Advanced Technologies Corp., Somerville, NJ Headquarters Leistritz Extrusionstechnik GmbH, Nuremberg Leistritz Machinery (Taicang) Co., Ltd., Taicang Leistritz Italia Estrusione, Castellanza Leistritz France Extrusion, Ceyzeriat ↗↗ Leistritz Extrusionstechnik GmbH | Markgrafenstraße 36-39 | 90459 Nuremberg | Germany T +49 911 4306-0 | [email protected]