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Mathematical modeling of the in-mold...

Chen, Xu.

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Mathematical modeling of the in-mold coating process for injection-molded thermoplastic parts.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Mathematical modeling of the in-mold coating process for injection-molded thermoplastic parts./
Author:	Chen, Xu.
Description:	135 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-04, Section: B, page: 1860.
Contained By:	Dissertation Abstracts International64-04B.
Subject:	Engineering, Industrial. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3088845

Mathematical modeling of the in-mold coating process for injection-molded thermoplastic parts.
Chen, Xu.

Mathematical modeling of the in-mold coating process for injection-molded thermoplastic parts. - 135 p.

Source: Dissertation Abstracts International, Volume: 64-04, Section: B, page: 1860.

Thesis (Ph.D.)--The Ohio State University, 2003.

In-Mold Coating (IMC) has been successfully used for many years for exterior body panels made from compression molded Sheet Molding Compound (SMC). The coating material is a single component reactive fluid, designed to improve the surface quality of SMC moldings in terms of functional and cosmetic properties. When injected onto a cured SMC part, IMC cures and bonds to provide a pain-like surface. Because of its distinct advantages, IMC is being considered for application to injection molded thermoplastic parts. For a successful in mold coating operation, there are two key issues related to the flow of the coating. First, the injection nozzle should be located such that the thermoplastic substrate is totally covered and the potential for air trapping is minimized. The selected location should be cosmetically acceptable since it most likely will leave a mark on the coated surface. The nozzle location also needs to be accessible for easy of maintenance. Secondly, the hydraulic force generated by the coating injection pressure should not exceed the available clamping tonnage. If the clamping force is exceeded, coating leakage will occur.Subjects--Topical Terms:

626639
Engineering, Industrial.

Mathematical modeling of the in-mold coating process for injection-molded thermoplastic parts.
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035 $a (UnM)AAI3088845
035 $a AAI3088845
040 $a UnM $c UnM
100 1 $a Chen, Xu. $3 1275298
245 1 0 $a Mathematical modeling of the in-mold coating process for injection-molded thermoplastic parts.
300 $a 135 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-04, Section: B, page: 1860.
500 $a Adviser: Jose M. Castro.
502 $a Thesis (Ph.D.)--The Ohio State University, 2003.
520 $a In-Mold Coating (IMC) has been successfully used for many years for exterior body panels made from compression molded Sheet Molding Compound (SMC). The coating material is a single component reactive fluid, designed to improve the surface quality of SMC moldings in terms of functional and cosmetic properties. When injected onto a cured SMC part, IMC cures and bonds to provide a pain-like surface. Because of its distinct advantages, IMC is being considered for application to injection molded thermoplastic parts. For a successful in mold coating operation, there are two key issues related to the flow of the coating. First, the injection nozzle should be located such that the thermoplastic substrate is totally covered and the potential for air trapping is minimized. The selected location should be cosmetically acceptable since it most likely will leave a mark on the coated surface. The nozzle location also needs to be accessible for easy of maintenance. Secondly, the hydraulic force generated by the coating injection pressure should not exceed the available clamping tonnage. If the clamping force is exceeded, coating leakage will occur.
520 $a In this study, mathematical models for IMC flow on the compressible thermoplastic substrate have been developed. Finite Difference Method (FDM) is first used to solve the 1 dimensional (1D) IMC flow problem. In order to investigate the application of Control Volume based Finite Element Method (CV/FEM) to more complicated two dimensional IMC flow, that method is first evaluated by solving the 1D IMC flow problem. An analytical solution, which can be obtained when a linear relationship between the coating thickness and coating injection pressure is assumed, is used to verify the numerical results. The mathematical models for the 2 dimensional (2D) IMC flow are based on the generalized Hele-Shaw approximation. It has been found experimentally that the power law viscosity model adequately predicts the rheological behavior of the coating. The compressibility of the substrate is modeled by the 2-domain Tait PVT equation. CV/FEM is used to solve the discretized governing equations. A computer code has been developed to predict the fill pattern of the coating and the injection pressure. A number of experiments have been conducted to verify the numerical predictions of the computer code. It has been found both numerically and experimentally that the substrate thickness plays a significant role on the IMC fill pattern.
590 $a School code: 0168.
650 4 $a Engineering, Industrial. $3 626639
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0546
690 $a 0794
710 2 0 $a The Ohio State University. $3 718944
773 0 $t Dissertation Abstracts International $g 64-04B.
790 1 0 $a Castro, Jose M., $e advisor
790 $a 0168
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3088845