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The Research on Key Theory for Polymer Multi-layer Co-extrusion Blow Precision Molding

Author: ZhouWenYan
Tutor: ZhouGuoFa
School: Nanchang University
Course: Chemical Process Equipment
Keywords: Multi-layer co-extrusion blow molding Precision Molding Die swell Mechanism Numerical Simulation
CLC: TQ320.662
Type: Master's thesis
Year: 2011
Downloads: 52
Quote: 0
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Abstract


In order to meet the high-tech development, plastic products continue to the precise direction of development. However, due to the coupling of polymer clay bomb characteristics and process parameters fluctuations, will produce the die swell fluctuations, making the production of precise size or shape of complex high-precision composite plastic device is still in the works is a technical challenge. The key to the multi-layer co-extrusion precision molding technology through high-precision process parameters online detection devices and closed-loop control system, strict control of the molding process parameters constant, to eliminate the fluctuations of the parison die swell, precision molding of polymer. However, the lack of high-precision plastic products dimensions and wall thickness Online detection device research, to shape it still can not meet the requirements of high-end precision plastic products extrusion blow molding accuracy. To this end, the precision of the size of the products, no high-precision closed-loop control system environment control key scientific issues, to carry out the the multilayer coextrusion blow molding size precision control key theoretical research, for speeding up the technological breakthroughs of the polymer precision molding equipment has important theoretical and engineering application value. In multi-layer composite coextrusion blow the parison die swell generated Mechanism based on the breakthrough in high-precision closed-loop control system consistent thinking, precision molding flow through the gas-assisted slip eliminate parison die swell control products size innovative research ideas, lack of resolve in the background of high precision product size precision control of high precision on-line detection device. By numerical simulation, we study the precision molding of polymer gas-assisted multi-layer co-extrusion blow molding innovation process critical theory, for precision molding device of polymer multilayer composite products and technical research breakthroughs laid the theoretical foundation of science. Mainly achieved the following results: (1) based on the characteristics of the polymer multilayer composite blow molding and polymer rheology, upon reasonable assumptions, the establishment of multi-factor interactions describe its molding process non-isothermal unsteady multilayer extrusion blow molding mechanism of theoretical models and with suitable and efficient steady-state finite element numerical algorithm; (2) by the process parameters and rheological properties of polymer parameters of polymer multilayer co-extrusion blow molding parison die swell research results of the comparative analysis of the secondary flow induced parison die swell scientific hypothesis, the the parison die swell and die at the exit out of the secondary flow is proportional to the intensity. (3) accurate closed-loop control system environment under the precise control of the multilayer composite coextrusion blow molding size theoretical premise is to eliminate the molding process of the secondary current, while the of molding flow from the non-uniform velocity distribution of shear extrusion flow speed uniformly distributed plunger extrusion flow is to eliminate the secondary flow of technical prerequisites, gas-assisted multi-layer co-extrusion precision molding innovative technology is a key technology to achieve this transformation; (4) gas-assisted multilayer The extrusion billet precision molding mechanism of gas-assisted multi-layer co-extruded parison precision molding process by the air cushion film adhesive completely slip effect, so that multi-layer co-extruded parison molding flow velocity distribution uneven shear extrusion the molding flow into the speed evenly distributed plunger extrusion flow so that molding flow shear deformation rate tends to zero, causing the driver induced parison forming secondary flow melt second normal stress difference tends to zero ultimate disappearance of the secondary flow at the exit of the die, thereby eliminating the parison molding die swell, and to achieve a gas-assisted multi-layer co-extruded parison precision molding; (5) established a set parison molding blowing swelling in one of the multi-layer coextrusion blow molding process numerical simulation method; (6) to study the influence of process parameters and rheological properties of polymer parameters of traditional gas-assist multi-layer co-extruded parison molding process, revealing its impact mechanism; (7) gas-assisted multi-layer co-extruded billet precision molding process numerical simulation results and experimental research conclusion consistent, reliable prove the theoretical models and numerical algorithms

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > General issues > Production process and production technology > Forming > Injection molding
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