A novel gas-assisted microcellular injection molding method for preparing lightweight foams with superior surface appearance and enhanced mechanical performance

2017 ◽  
Vol 127 ◽  
pp. 115-125 ◽  
Author(s):  
Junji Hou ◽  
Guoqun Zhao ◽  
Guilong Wang ◽  
Guiwei Dong ◽  
Jiaju Xu
Keyword(s):  
Injection Molding ◽  
Mechanical Performance ◽  
Surface Appearance ◽  
Molding Method ◽  
Microcellular Injection Molding ◽  
Superior Surface

scholarly journals A Combined In-Mold Decoration and Microcellular Injection Molding Method for Preparing Foamed Products with Improved Surface Appearance

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 778 ◽  
Author(s):  
Wei Guo ◽  
Qing Yang ◽  
Huajie Mao ◽  
Zhenghua Meng ◽  
Lin Hua ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Injection Molding ◽  
Surface Appearance ◽  
Molding Method ◽  
Microcellular Injection Molding ◽  
A Cell ◽  
Higher Temperature ◽  
The Heat Transfer Coefficient ◽  
Film Side

A combined in-mold decoration and microcellular injection molding (IMD/MIM) method by integrating in-mold decoration injection molding (IMD) with microcellular injection molding (MIM) was proposed in this paper. To verify the effectiveness of the IMD/MIM method, comparisons of in-mold decoration injection molding (IMD), conventional injection molding (CIM), IMD/MIM and microcellular injection molding (MIM) simulations and experiments were performed. The results show that compared with MIM, the film flattens the bubbles that have not been cooled and turned to the surface, thus improving the surface quality of the parts. The existence of the film results in an asymmetrical temperature distribution along the thickness of the sample, and the higher temperature on the film side leads the cell to move toward it, thus obtaining a cell-offset part. However, the mechanical properties of the IMD/MIM splines are degraded due to the presence of cells, while specific mechanical properties similar to their solid counterparts are maintained. Besides, the existence of the film reduces the heat transfer coefficient of the film side so that the sides of the part are cooled asymmetrically, causing warpage.

Preparation and characterization of microcellular injection molded foams from high-performance blends based on PPS-modified PPBESK

2017 ◽  
Vol 30 (4) ◽  
pp. 480-488 ◽  
Author(s):  
Na Wen ◽  
Tao Liu ◽  
Bin Xiang ◽  
Yajie Lei ◽  
Shikai Luo
Keyword(s):  
Injection Molding ◽  
High Performance ◽  
Polyphenylene Sulfide ◽  
Mechanical And Thermal Properties ◽  
Melt Mixing ◽  
Average Cell Size ◽  
Average Cell ◽  
Molding Method ◽  
Microcellular Foams ◽  
Microcellular Injection Molding

Obtaining foams of poly-containing biphenyl moieties (phthalazinone ether sulfone ketone; PPBESK) by applying the microcellular injection molding method is very difficult because of the high melt viscosity of the materials used. To overcome this limitation, polyphenylene sulfide (PPS) was used to improve the rheological properties of PPBESK. PPBESK/PPS blends of different proportions were prepared using the melt mixing method. The rheological behavior, phase behavior, interfacial tension, and mechanical properties of the blends were then investigated. The results clearly indicate that PPS can improve the melt processability of PPBESK. However, due to the strong adhesion between the PPS and PPBESK phases, the introduction of PPS did not cause any loss of the mechanical and thermal properties of PPBESK. Accordingly, microcellular foams from modified PPBESK were prepared by microcellular injection molding with supercritical nitrogen as foaming agent. A closed cell microcellular morphology with an average cell size of 17.7 um and cell density of 109 cells cm−3 was obtained.

Fabrication of a Nanosize Pattern Embedded Plastic Chip via an Injection Molding Method for Application to an Optical Biosensor

2010 ◽  
Vol 25 (5) ◽  
pp. 341-345
Author(s):  
K. H. Kim ◽  
W. Kim ◽  
J. C. Hong ◽  
H. S. Ko ◽  
B. K. Kim ◽  
...  
Keyword(s):  
Injection Molding ◽  
Optical Biosensor ◽  
Molding Method

Application of Taguchi Method for Parameters Optimization in Micro Metal Injection Molding

2011 ◽  
Vol 52-54 ◽  
pp. 244-248
Author(s):  
Haw Pei Li ◽  
Norhamidi Muhamad ◽  
Abu Bakar Sulong ◽  
Heng Shye Yunn ◽  
Hooman Abolhasani
Keyword(s):  
Injection Molding ◽  
Signal To Noise Ratio ◽  
Steel Powder ◽  
Mold Temperature ◽  
Parameters Optimization ◽  
Simultaneous Optimization ◽  
Metal Injection Molding ◽  
Surface Appearance ◽  
Optimal Injection ◽  
Acetate Butyrate

Optimization of injection parameters in Micro Metal Injection Molding (μMIM) was described in this study. Stainless steel powder was mixed with Polyethelena Glycol (PEG), Polymethyl Methacrilate (PMMA) and Cellulose Acetate Butyrate (CAB) to produce feedstock. Design of Experiments (DOE) of Taguchi L-27 (313) orthogonal array technique has been used to investigate the significance and optimal injection molding parameters. The signal-to-noise ratio and analysis of variance (ANOVA) are applied to study the optimum levels and effects of process parameters. Simultaneous optimization to obtain the highest green density and excellent surface appearance was discussed. The result concluded that the mold temperature (D) is the most statistically significant process parameter and its contribution to the best appearance and density is the highest.

Development of ultraprecise injection molding method for thermoplasticlenses

1992 ◽  
Author(s):  
Akiro Fukushima ◽  
Motoaki Kawazu ◽  
Hidenori Ito ◽  
Hisaaki Koseko ◽  
Toshiharu Hatakeyama ◽  
...  
Keyword(s):  
Injection Molding ◽  
Molding Method

Influence of the processing method on the heat resistance of the secondary block copolymer of propylene and ethylene filled with rice hulls

2021 ◽  
Vol 11 ◽  
pp. 32-38
Author(s):  
A. R. Sadritdinov ◽  
◽  
E. M. Zakharova ◽  
A. A. Psyanchin ◽  
A. G. Khusnullin ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Injection Molding ◽  
Heat Resistance ◽  
Polymer Composites ◽  
Softening Temperature ◽  
Mechanical Action ◽  
Decomposition Temperature ◽  
Inert Atmosphere ◽  
Rice Hulls ◽  
Molding Method

Polymer composites based on secondary thermoplastic polymers filled with biodegradable components of plant origin was developed. Repeated thermal and mechanical action on polymers during their processing in the presence of dispersed phase particles leads to a change in the thermophysical and strength characteristics of finished products. The paper studies the regularities of changes in the heat resistance of polymer composites based on a secondary block copolymer of propylene and ethylene, and rice husks, processed by injection molding and pressing. It is shown that filling the secondary polymer with rice hulls leads to an increase in the heat resistance of composites, which is characterized by an increase in the bending temperature under load, Vicat softening temperature, and decomposition temperature during thermogravimetric analysis in an inert atmosphere. Compared to the injection molding method, the processing of polymer composites by pressing makes it possible to obtain more heat-resistant plastic products. Obviously, this is due to the different degrees of crystallinity of the polymer phase. The high cooling rate of the polymer composite melt during the filling of the injection mold reduces the time required for the corresponding change in the conformation of macromolecules and the formation of the crystalline phase. As a consequence, an increase in the content of the amorphous phase of the secondary block copolymer of propylene and ethylene decreases the heat resistance of the prototypes.

Microcellular Injection Molding

2005 ◽  
Vol 20 (2) ◽  
pp. 202-214 ◽  
Author(s):  
S. Gong ◽  
M. Yuan ◽  
A. Chandra ◽  
H. Kharbas ◽  
A. Osorio ◽  
...  
Keyword(s):  
Injection Molding ◽  
Microcellular Injection Molding
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