Zhubei, Taiwan
Zhubei, Taiwan

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Patent
MOLECULAR DYNAMICS TECHNOLOGY Co. and Coretech System Co. | Date: 2011-06-24

One aspect of the present invention provides a method for determining orientation of fibers in a fluid having polymer chains, characterized in that the determining of the orientation of the fibers is performed by taking into consideration an interaction between the fibers and the fluid, wherein the interaction between the fibers and the fluid comprises changes in configuration of the polymer chain to cause the entanglement or adsorption between the fibers and the polymer chains. Another aspect of the present invention provides a method for determining orientation of fibers in a fluid having polymer chains, the fibers in the fluid including a transitional movement and a rotatory movement, the method being characterized in that the determining of the orientation of the fibers is performed by taking into consideration a steric barrier effect on a rotary movement of the fibers.


Patent
Coretech System Co. and Molecular Dynamics Technology Co. | Date: 2012-12-26

One aspect of the present invention provides a method for determining orientation of fibers in a fluid having polymer chains, characterized in that the determining of the orientation of the fibers is performed by taking into consideration an interaction between the fibers and the fluid, wherein the interaction between the fibers and the fluid comprises changes in configuration of the polymer chain to cause the entanglement or adsorption between the fibers and the polymer chains. Another aspect of the present invention provides a method for determining orientation of fibers in a fluid having polymer chains, the fibers in the fluid including a transitional movement and a rotatary movement, the method being characterized in that the determining of the orientation of the fibers is performed by taking into consideration a steric barrier effect on a rotary movement of the fibers.


Patent
Coretech System Co. and Molecular Dynamics Technology Co. | Date: 2014-01-01

One aspect of the present invention provides a method for determining orientation of fibers in a fluid having polymer chains, characterized in that the determining of the orientation of the fibers is performed by taking into consideration an interaction between the fibers and the fluid, wherein the interaction between the fibers and the fluid comprises changes in configuration of the polymer chain to cause the entanglement or adsorption between the fibers and the polymer chains. Another aspect of the present invention provides a method for determining orientation of fibers in a fluid having polymer chains, the fibers in the fluid including a transitional movement and a rotatary movement, the method being characterized in that the determining of the orientation of the fibers is performed by taking into consideration a steric barrier effect on a rotary movement of the fibers.


Lin G.-G.,Tamkang University | Song Y.-H.,Zhejiang University | Shiu T.-Y.,CoreTech System Co. | Cheng H.-D.,Tamkang University
Polymer Engineering and Science | Year: 2014

Nonlinear rheological properties of polyolefins have long been studied and predicted by using the Larson model with the damping function generally obtained from the stress relaxation measurements. In this study, we investigate the nonlinear rheological properties of high density polyethylene (HDPE) and polypropylene (PP) using the Larson model with damping functions obtained from either the dynamic frequency sweep or the stress relaxation test. Experimental measurements and their corresponding model predictions for the rheological parameters were then compared to evaluate the applicability of the Larson model to the nonlinear rheology, and the following conclusions could be achieved. The steady shear viscosity could be satisfactorily described by the Larson model with the damping functions obtained from the two different methods, except at shear rates higher than 103 s-1. The predicted first normal stresses also account for the measured data, except for those using the stress relaxation data showing a little deviation for the PP sample. In addition, the predictions for elongation viscosity are also in good agreement with the experimental results within the short range of elongation rate achieved in this work. © 2013 Society of Plastics Engineers.


Brahmayya M.,Hungkuang University | Wang M.-L.,Hungkuang University | Wang M.-L.,Coretech System Co.
Journal of the Taiwan Institute of Chemical Engineers | Year: 2016

The synthesis of 4-benzyloxy toluene was successfully carried out by reacting the sodium benzyloxide (BnO-Na+) with p-bromotoluene and sodium hydroxide/phase transfer catalyst system at 50°C under microwave irradiation. The nucleophilic susbstitution reaction was well explained by comparing the phase transfer catalyst system and microwave irradiation. The chemical kinetics of the reaction depends on the amount of catalyst, amount of sodium hydroxide, effect of phase-transfer catalysts, volume of benzylalcohol (BnOH) and temperature on the transformation of the reaction were studied. © 2016 Taiwan Institute of Chemical Engineers.


Foss P.H.,General Motors | Tseng H.-C.,CoreTech System Co. | Snawerdt J.,CoreTech System Co. | Chang Y.-J.,CoreTech System Co. | And 2 more authors.
Polymer Composites | Year: 2014

In the automotive industry, glass-filled thermoplastics are used in air intake manifolds, radiator tanks, and many other parts. However, widespread application of glass-filled thermoplastic materials has been limited in many cases by the inability to accurately predict performance and durability. Since a more accurate fiber orientation prediction will lead to more accurate local mechanical property predictions, this work investigated a recently proposed mathematic model of fiber suspension rheology, which considers the anisotropic fiber diffusion and fiber-matrix interaction from a microscopic viewpoint. The new model proved able to predict many details of the fiber orientation distribution and could be applied advantageously as part of the product and manufacturing development processes. © 2013 Society of Plastics Engineers.


Huang C.-T.,CoreTech System Co. | Tseng H.-C.,CoreTech System Co. | Chen M.-C.,CoreTech System Co. | Vlcek J.,Compuplast International A.s.
Proceedings of the American Society for Composites - 30th Technical Conference, ACS 2015 | Year: 2015

Long glass fiber pellets has emerged as a potential substitute for metals in the making of non-load bearing automotive structural components and panels for the past five years. Their weight can be reduced and the part design can be more flexible. Long fiber now finds its balance between the mechanical performance and the easiness of processing. Since maintaining the fiber length is crucial to the superior performance of the long fiber, it is crucial to consider the machinery design along the melt pathway, including the screw, nozzle, runner, and the gate so as not to pose high stress on the fiber causing breakage. We presented in this paper a simulation method to predict the fiber length degradation during the plastication of the injection molding process. The screw design and the processing setting proved to be important for the fiber breakage. This method serves as the missing element by considering the effect of screw and barrel, which has not been addressed before with injection molding simulation. Copyright © 2015 by DEStech Publications, Inc. and American Society for Composites. All rights reserved.


A computer-implemented method and non-transitory computer medium for calculating a shrinkage of a molding product comprises a step of using a computer processor to calculate a molding pressure of a molding fluid in a molding cavity by taking into consideration an increase of a shear viscosity of the molding fluid by a decrease of a shear rate, and a step of calculating the shrinkage of the molding products by taking into consideration a variation of a specific volume of the molding fluid as the molding pressure and a molding temperature decrease.


A computer-implemented simulation method for use in molding process by a computer processor includes specifying a simulating domain having a mold cavity configured to connect a tube of a molding machine, creating a mesh by dividing at least part of the simulating domain, generating at least one flow parameter of a molding material in the tube, specifying boundary conditions of the mesh by taking into consideration the at least one flow parameter of the molding material, and simulating a molding process of the molding material that is injected into the mold cavity by using the boundary conditions to generate a plurality of molding conditions.


Patent
Coretech System Co. | Date: 2016-07-12

A method for operating a molding machine includes specifying a simulating domain corresponding to a genuine domain in a mold disposed on the molding machine. The method proceeds to perform a virtual molding by using a setting packing pressure profile to generate a simulated state waveform, generating a designed state waveform including an isobaric phase and an isochoric phase while taking into consideration the simulated state waveform, and obtaining an updated packing pressure profile for applying a molding pressure to a portion of the genuine domain while taking into consideration a difference between the simulated state waveform and the designed state waveform. Subsequently, the method proceeds to set the molding machine while taking into consideration the updated packing pressure profile to perform an actual molding by applying an actual molding pressure to the at least a portion of the genuine domain to prepare the molding product.

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