Morphology Evolution of Polymer Blends under Intense Shear During High Speed Thin-Wall Injection Molding

2017 ◽  
Vol 121 (25) ◽  
pp. 6257-6270 ◽  
Author(s):  
Yi Zhou ◽  
Feilong Yu ◽  
Hua Deng ◽  
Yajiang Huang ◽  
Guangxian Li ◽  
...  
Keyword(s):  
Injection Molding ◽  
Polymer Blends ◽  
High Speed ◽  
Morphology Evolution ◽  
Thin Wall ◽  
Wall Injection ◽  
Intense Shear

Anisotropic multilayer conductive networks in carbon nanotubes filled polyethylene/polypropylene blends obtained through high speed thin wall injection molding

Polymer ◽  
2013 ◽  
Vol 54 (23) ◽  
pp. 6425-6436 ◽  
Author(s):  
Feilong Yu ◽  
Hua Deng ◽  
Qin Zhang ◽  
Ke Wang ◽  
Chaoliang Zhang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Injection Molding ◽  
High Speed ◽  
Thin Wall ◽  
Wall Injection ◽  
Polypropylene Blends

scholarly journals Experimental Characterization and Simulation of Thermoplastic Polymer Flow Hesitation in Thin-Wall Injection Molding Using Direct In-Mold Visualization Technique

Micromachines ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 428
Author(s):  
Francesco Regi ◽  
Patrick Guerrier ◽  
Yang Zhang ◽  
Guido Tosello
Keyword(s):  
Injection Molding ◽  
High Speed ◽  
Pressure Sensors ◽  
Injection Pressure ◽  
Acrylonitrile Butadiene Styrene ◽  
Injection Molding Process ◽  
Thin Wall ◽  
Molding Process ◽  
Video Recordings ◽  
Wall Injection

A special mold provided with a glass window was used in order to directly evaluate the flow progression during the filling phase of the injection molding process in a thin-wall cavity and to validate the simulation of the process with particular focus on the hesitation effect. The flow of the polymer was recorded at 500 frames per second using a high-speed camera (HSC). Two unfilled thermoplastic polymers, acrylonitrile butadiene styrene (ABS), and polypropylene (PP), were used to fill two different 50 mm × 18 mm staircase geometry cavities, which were specifically designed to evaluate the hesitation effect with thicknesses of 1500, 1250, 1000, 750, 500 µm (cavity insert no. 1) and 1500, 1200, 900, 600, 300 µm (cavity insert no. 2). In addition to the video recordings, the simulations were validated using the timings and the data obtained by three pressure sensors and two thermocouples located in the cavity. For each injection cycle recorded on camera the machine data were collected to carefully implement the correct boundary conditions in the simulations. The analysis of the video recordings highlighted that flow progression and hesitation were mainly influenced not only by the thickness, but also by the velocity and the material type. The simulation results were in relatively good agreement with the experiments in terms of flow pattern and progression. Filling times were predicted with an average relative error deviation of 2.5% throughout all the section thicknesses of the cavity. Lower accuracies in terms of both filling times and injection pressure were observed at increasingly thinner sections.

Investigation of mold plate separation in thin-wall injection molding

2003 ◽  
Vol 22 (4) ◽  
pp. 306-319 ◽  
Author(s):  
Shia-Chung Chen ◽  
Wei-Liang Liaw ◽  
Pao-Lin Su ◽  
Ming-Hsiu Chung
Keyword(s):  
Injection Molding ◽  
Thin Wall ◽  
Mold Plate ◽  
Plate Separation ◽  
Wall Injection

Analysis of Residual Stress in Thin Wall Injection Molding

2006 ◽  
Vol 306-308 ◽  
pp. 1331-1336
Author(s):  
H.K. Lee ◽  
J.C. Huang ◽  
G.E. Yang ◽  
Hong Gun Kim
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Injection Molding ◽  
Molecular Orientation ◽  
Polymeric Materials ◽  
Residual Stress Distribution ◽  
Thin Wall ◽  
Flow Paths ◽  
Wall Injection ◽  
Relationship Of

A relationship of residual stress distribution and surface molding states on polymeric materials is presented in thin-walled injection molding. The residual stress is computed by computational numerical analysis, observed with stress viewer and birefringence. The residual stress on polymeric parts can allude the surface quality as well as flow paths. The residual stress distribution on polymeric parts is related with thickness, gate layout, and polymer types. Molecular orientation on polymeric parts is also important in thin wall injection molding. The residual stress and molecular orientation are related to the surface molding states intimately. Analysis of the residual stress is validated through photo-elastic method and surface molding states..

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