Method and apparatus for screw chaos triggering, and application thereof

Abstract

The invention provides with a screw rod chaotic triggering method. Rotate the chaotic triggering device continuously arranged in the screw slot by rotating the screw rod with driving components meanwhile the transmitting components fixed at one end of the screw rode driving the screw rod chaotic triggering device pulsating oscillatingly longitudinally with the speed rate to the rotating speed of the screw rod the natural number M ( 1 smaller than or equal to M smaller than or equal to 10) or irrational number N ( 1 smaller than N smaller than 10) so to achieve the chaotic triggering. The trigger device includes chaotic trigger continuously arranged in the screw rod slot and linked with the screw rod with transmitting components set at one end of the screw rod. Above method can be applied on food processing, polymer ejecting, shaping, plastic filling and co-mixing, modifying or reaction ejecting to perform the chaotic triggering. The invention continuous rabbles in the material which obviously enhances the distribution and scattering effects while its energy cost is low and can suit operation mode with high requirements. It is of low cost and a good market foreground.

Description

technical field [0001] The invention relates to extrusion technology, in particular to a method for triggering screw chaos and its application. Background technique [0002] At present, screw devices are widely used in industrial occasions such as food processing, polymer molding processing, plastic filling blending, and reaction extrusion. However, existing screw devices, especially single-screw extruders, have always had poor mixing effects. lack of. Studies on the mixing mechanism of single-screw extruders have shown that the high viscosity of the polymer melt precludes the existence of turbulent, wake vortices (W.D.Mohr, R.L.Saxton, and C.H.Jepson.Mixing in Laminar Flow Systems.Ind.Eng. Chem..1957,49:1855-1857); And further research shows (J.M.Ottino and R.Chella.LaminarMixing of Polymeric Liquids; A Brief Review and Recent TheoreticalDevelopments[J].Polym.Eng.Sci..1983,23( 7): 357-3794), the melt is mixed in a regular shell laminar flow in the screw groove of the sing...

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Problems solved by technology

Kim and Kwon et al. started from a simple geometric thought experiment, inserted intermittent short screw edges in the single screw along the development direction of the screw groove and introduced periodic hyperbolic point disturbances, and proposed a new concept of chaotic screw (T.H.Kwon, J.W.JOO and S.J.Kim. Kinematics and Deformation Characteristics as a Mixing Measure in the Screw. Polymer Engineering and Science. 1994, 34(3): 174-189), the experimental study found that the screw in the case of a small increase in extrusion power, the polymer The mixing effect of the melt has been improved; but there are still some technical defects in this screw with short flight chaotic trigger: (1) the disturbance is discontinuous; the disturbance of the screw with intermittent short flight is discontinuous, only At the discontinuity of the short screw edge as a trigger of chaos, the mixing will be improved to a greater extent, but this will inevitably lead to increased power consumption, lack of continuous dynamics thinking; (2) difficult to process; the short screw as a trigger of chaos The rib and the screw are fixed together, similar to the structure of a double-ended screw, which increases the difficulty and cost of screw processing; (3) the dispersion and mixing effect is poor; there is no relative motion between the short screw rib and the screw groove as a chaotic trigger , the mixing at the bottom of the screw channel is relatively weak, which has little effect on improving the dispersion mixing, and the improvement of the mixing process is passive and limited

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