innovation
发表于 2025-3-26 21:54:03
Rheological Measurements: Oscillatory, Rotational, and Pressure flows,mers is (i) . (i.e the fluid “remembers” what happened to it before) and (ii) highly . (i.e dependent on the amplitude of the deformation) at large strains. So basic rheological measurements have to be carried out in simple flow geometries if one wishes to define precisely the relationship between t
colloquial
发表于 2025-3-27 04:49:42
Application of Rheology to Polymer Processing,hnique is used depends on, a) chemical stability, and b) the ability of the ability to melt or dissolve. For example, polyethylene is generally melt processed since it is stable in the melt but only soluble with some difficulty. Polyacrylonitrile and its copolymers, in comparison, are soluble but in
表被动
发表于 2025-3-27 06:03:08
,Polymer Processing Modelling — Approximation Methods, mixed with the raw polymer to obtain a compound (powder or pellets). This compound is then melted (semicrystalline polymers) or plasticized (amorphous polymers) by thermal conduction and by viscous dissipation. The highly viscous melt is then forced through a die or into a mold in order to obtain a
Tdd526
发表于 2025-3-27 11:24:10
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mosque
发表于 2025-3-27 17:27:26
Modeling and Optimization of Single Screw Extrusion for Thermoplastics,rstanding of the physical phenomena occuring during the process, which has allowed mathematical modelling of the different functional zones : solid conveying, melting, pumping... Computation softwares are today capable of a complete description of the flow from the hopper to the die and permit to op
多样
发表于 2025-3-27 20:14:21
Distributive Mixing in Extruders,ale where diffusion, or chemical reaction, can occur. The mathematics and nature of distributive mixing have been expressed in terms of the kinematics of the flow — Spencer and Wiley and Erwin — and the continuum mechanics — Aref and Ottino Each approach describes “mixing” as th
blight
发表于 2025-3-27 23:54:22
,Simulation of Thermoforming and Blowmolding — Theory and Experiments, liners has made it important that minimum requirements on part thicknesses be met when forming plastic parts. The two primary industrial processes for forming both small and large, thin walled plastic parts are thermoforming and blowmolding. Generally, during these processes, polymers behave in a v
chronicle
发表于 2025-3-28 04:41:21
The Inverse Problem in Polymer Processing,discussing advances in equipment, or in process analysis and simulation. This last aspect has received particular attention in the last few years, as it is important to make available efficient tools for assisting design and optimisation activities. The simulation of a given process usually involves
弄污
发表于 2025-3-28 09:08:15
Numerical Practice in Polymer Processing,en used method. It can be applied to complex geometries, with accurate constitutive equations. Three dimensional codes are computationally expensive. Boundary elements can be computationally inexpensive. Control volume is relatively computationally inexpensive. It is often used in injection molding
FLIC
发表于 2025-3-28 14:13:49
Kinetics of Shear Induced Crystallization,ents. In this connection the method of short-term shearing gained a central position. It enabled a practical separation of the period, in which precursors were formed under influence of shear, from the later period of lateral lamellar growth. The findings of the latter period permitted safe conclusi