Constitutive characterization of extruded rubber blends by means of an extrusion rheometer
نویسنده
چکیده
In this contribution the influence of an extrusion process on the viscosity function of rubber blends is identified. This knowledge is required for performance of realistic numerical simulations of injection heads and extrusion tools for rubber profile production. The experimental basis of this investigation are tests with both, capillary and extrusion rheometer. The latter is a combination of an industrial extruder and a circular cross-sectional extrusion tool, allowing the application of material characterization methods used for capillary experiments. Thus, determination of the viscosity function of extruded rubber blends is possible. Additional capillary experiments allow an identification of the influence of extrusion on the viscosity of rubber blends. For the material characterization a nonlinear iteration scheme is used, which is proven to be applicable for rubber compounds and rubber blends. Successful verification of extrusion rheometer tests are performed with numerical back-calculation of the corresponding pressure measurements. Figure 1. Extruder for industrial applications: (a) vertical extruder, (b) band supply of raw material. 2 EXPERIMENTAL INVESTIGATIONS
منابع مشابه
Experimental Identification of Viscoelastic Properties of Rubber Blends by Means of a Torsional Rheometer
The dimensioning of injection heads for the extrusion of rubber profiles is exclusively based on empiric knowledge of the non-linear flow behaviour of elastomers. The swelling of the extrudate when emerging from a capillary is typical for viscoelastic fluids, such as polymers and rubber blends, respectively. Therefore, the experimental investigation and numerical treatment of this swelling beha...
متن کاملChapter-3. Rheological Behavior of Starch-Polycaprolactone (PCL) Nanocomposite Melts Synthesized by Reactive Extrusion
3.1 Abstract Rheological behavior of reactively extruded starch-PCL nanocomposite blends was evaluated in an off-line capillary rheometer. Power law models for blends with different nanoclay volume fractions were developed using appropriate correction factors. Consistency coefficients K for blends containing starch were significantly higher than 100% PCL. Starch-PCL nanocomposite blends showed ...
متن کاملExperimental Investigation and Identification of Material Parameters for Rubber Blends
Capillary rheometry simulates polymer extrusion in a simplified way. It allows the characterisation of polymers by means of determination of the viscosity function and extrudate swell. As regards viscous properties, there is still a lack of constitutive characterisation of rubber blends. In this contribution new concepts are presented how the viscous properties are computed without using common...
متن کاملExperimental and Numerical Investigation of the Die Swell Phenomenon of Rubber Blends
Rubber profiles fabricated by means of extrusion are widely used in civil engineering, e.g., in pipeline constructions and for window sealings. The dimensioning of injection heads for the extrusion of rubber profiles is exclusively based on empiric knowledge of the non-linear flow behaviour of elastomers, basically of the so-called die swell. The swelling of the extrudate when emerging from a c...
متن کاملInvestigation of structural, morphological and dynamic mechanical properties of unvulcanized PDMS/silica compound
In this study, the interaction between the silica filler and polydimethylsiloxanes (PDMS) was investigated from the aspects of the bound rubber and morphological characterization. With special attention to the dynamic properties, the dynamic test was conducted by dynamic shear rheometer. The results show that the modified fillers disperse uniformly within PDMS matrix without aggregation and con...
متن کامل