scholarly journals Self-Assembled Monolayers of Alkanethiols on Nickel Insert: Characterization of Friction and Analysis on Demolding Quality in Microinjection Molding

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 636
Author(s):  
Jiachen Chen ◽  
Jin Yang ◽  
Mingyong Zhou ◽  
Can Weng
Keyword(s):  
Injection Molding ◽  
Surface Effect ◽  
Mold Insert ◽  
Self Assembled Monolayers ◽  
Injection Molding Process ◽  
Molding Process ◽  
Adhesion Properties ◽  
Assembled Monolayers ◽  
Self Assembled

When the part geometry scaling down from macro to microscale level, the size-induced surface effect becomes significant in the injection molding process. The adhesion between polymer and nickel (Ni) mold insert during the process can lead to defects in necking, warping and deformation of microstructure. In this study, the self-assembled monolayers (SAMs) with low surface energy were deposited on the Ni surface to reduce the adhesion and further improve the demolding quality of the microstructure. Results show that the alkyl mercaptan SAMs with chemical bonds and close alignment can be successfully deposited on the surface of Ni by the solution deposition method. The contact angle, surface free energy, and friction coefficient before and after anti-adhesion treatment on the surface of mold insert were measured. In addition, the anti-adhesion properties of different alkyl mercaptan materials and the correspondingly replication quality of microstructure parts after injection molding were analyzed. It is found that the Ni mold insert treated by the perfluorodecanethiol has the best wear resistance and still shows good reproducibility at the 100th demolding cycle.

scholarly journals Experimental Investigation and Molecular Dynamics Simulation on the Anti-Adhesion Behavior of Alkanethiols on Nickel Insert in Micro Injection Molding

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1834
Author(s):  
Can Weng ◽  
Jiachen Chen ◽  
Jin Yang ◽  
Mingyong Zhou ◽  
Bingyan Jiang
Keyword(s):  
Molecular Dynamics ◽  
Injection Molding ◽  
Md Simulation ◽  
Mold Insert ◽  
Dynamics Simulation ◽  
Injection Molding Process ◽  
Molding Process ◽  
Micro Injection Molding ◽  
Adhesion Behavior ◽  
Self Assembled

Due to the adhesion between the polymer melt and nickel (Ni) mold insert in the micro injection molding process, deformation defects frequently occur when the microstructures are demolded from the insert. In this study, self-assembled alkanethiols were applied to modify the surface of Ni mold insert to reduce its surface energy. Experimental trials were undertaken to explore the effect of alkanethiols coating on the replication quality. After that, molecular dynamics (MD) simulation was then used to investigate the adhesion behavior between the self-assembled coating and polypropylene (PP) by establishing three different types of alkanethiol material. The interaction energy, the potential energy change and radial distribution function were calculated to study the anti-adhesion mechanism. Experimental results show that all the three coatings can effectively decrease the adhesion and therefore promote the replication fidelity. It is demonstrated in MD simulation that the adhesion mainly comes from the van der Waals (vdW) force at the interface. The arrangement of sulfur atom on the Ni surface results in different absorbing behaviors. Compared with that of the PP–Ni interface, the interfacial energy and adhesion work after surface treatment is significantly reduced.

Alkanethiol Adsorption on Platinum: Chain Length Effects on the Quality of Self-Assembled Monolayers

2011 ◽  
Vol 115 (36) ◽  
pp. 17788-17798 ◽  
Author(s):  
María Alejandra Floridia Addato ◽  
Aldo A. Rubert ◽  
Guillermo A. Benítez ◽  
Mariano H. Fonticelli ◽  
Javier Carrasco ◽  
...  
Keyword(s):  
Chain Length ◽  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Platinum Chain ◽  
Length Effects

scholarly journals Holding Pressure and Its Influence on Quality in PIM Technology

10.14311/1608 ◽  
2012 ◽  
Vol 52 (4) ◽  
Author(s):  
Pavel Petera
Keyword(s):  
Phase Separation ◽  
Injection Molding ◽  
Density Measurement ◽  
Powder Injection Molding ◽  
New Method ◽  
Powder Injection ◽  
Injection Molding Process ◽  
Molding Process

The PIM (powder injection molding) process consists of several steps in which faults can occur. The quality of the part that is produced usually cannot be seen until the end of the process. It is therefore necessary to find a way to discover the fault earlier in the process. The cause of defects is very often “phase separation” (inhomogeneity in powder distribution), which can also be influenced by the holding pressure. This paper evaluates the powder distribution with a new method based on density measurement. Measurements were made using various holding pressure values.

The use of photogrammetry in improving quality of workpieces after an injection molding process

Polimery ◽  
2018 ◽  
Vol 63 (02) ◽  
pp. 134-144 ◽  
Author(s):  
Michal Wieczorowski ◽  
Bartosz Gapinski ◽  
Miroslaw Grzelka ◽  
Marek Szostak ◽  
Maciej Szymanski
Keyword(s):  
Injection Molding ◽  
Injection Molding Process ◽  
Molding Process

Function Analysis of Injection Molding

2011 ◽  
Vol 189-193 ◽  
pp. 2699-2703
Author(s):  
Ji Quan Li ◽  
Yan Hu ◽  
Ying Kong ◽  
Shao Fei Jiang ◽  
Chuan Chen
Keyword(s):  
Injection Molding ◽  
Detailed Analysis ◽  
Function Analysis ◽  
Injection Molding Process ◽  
Molding Process ◽  
Quality Function ◽  
Analysis And Evaluation ◽  
Definition Of

The function of injection molding process is described in the quality, function and costs of injection products from the definition of function. Detailed analysis and evaluation are taken to investigate these three aspects, and the aspect of injection products quality is principally discussed. The analysis and evaluation of injection molding process function will be kept as the judgment of quality of the process.

Influence of Technological Parameters on Material Flow

2015 ◽  
Vol 1120-1121 ◽  
pp. 1194-1197 ◽  
Author(s):  
Michal Stanek ◽  
David Manas ◽  
Miroslav Manas ◽  
Vojtech Senkerik ◽  
Adam Skrobak ◽  
...  
Keyword(s):  
Injection Molding ◽  
Injection Pressure ◽  
Polymer Processing ◽  
Injection Rate ◽  
Cavity Surface ◽  
Injection Molding Process ◽  
Technological Parameters ◽  
Molding Process ◽  
Processing Technologies

Injection molding is one of the most extended polymer processing technologies. It enables the manufacture of final products, which do not require any further operations. The tools used for their production – the injection molds – are very complicated assemblies that are made using several technologies and materials. Delivery of polymer melts into the mold cavity is the most important stage of the injection molding process. The fluidity of polymers is affected by many parameters Inc. mold design. Evaluation of set of data obtained by experiments in which the testing conditions were widely changed shows that the quality of cavity surface and technological parameters (injection rate, injection pressure and gate size) has substantial influence on the length of flow.

scholarly journals ANALYSIS ON VOLUMETRIC SHRINKAGE OF PLASTIC FOOD CONTAINER MADE FROM AN INJECTION MOLDING PROCESS

2020 ◽  
Vol 8 (2) ◽  
pp. 22-31
Author(s):  
Rosidah Jaafar ◽  
◽  
Hambali Arep ◽  
Effendi Mohamad ◽  
Jeefferie Abd Razak ◽  
...  
Keyword(s):  
Injection Molding ◽  
Process Parameters ◽  
Food Packaging ◽  
Plastic Injection Molding ◽  
Volumetric Shrinkage ◽  
Injection Molding Process ◽  
Molding Process ◽  
Melt Temperature ◽  
Plastic Injection

The plastic injection molding process is one of the widely used of the manufacturing process to manufacture the plastic product with high productivity. Moreover, the food packaging manufacturing industry undergoes the trials and errors to obtain the optimal setting of the process parameters in order to minimize the quality issues and these trials and errors are time consuming and costly. The aim of this study is to improve the quality of the butter tub by minimizing the volumetric shrinkage. This study is to deal with the application of Moldflow integrating with the statistical technique to minimize the volumetric shrinkage the butter tub which depends on the process parameters of the plastic injection molding. For this purpose, the rectangular shape of butter tub is designed by utilizing the SolidWorks. Molflow is used to simulate the plastic filling of the single cavity mold of butter tub based on the Taguchi’s �!" orthogonal array table. In addition, the analysis of variance (ANOVA) is applied to investigate significant impact of the process parameters on the quality of the butter tub. Minitab is used to optimize the response of the volumetric shrinkage by selecting the most appropriate process parameters that maximizing the desirability value. Furthermore, the butter tub has a uniform thickness which was 1.2 mm and its factor of safety was 3.383 and the volumetric shrinkage response have optimized by 0.956 %. The melt temperature and mold temperature are found to be the most significant process parameters for the plastic injection molding process of butter tub and the volumetric shrinkage value obtained from the simulation is verified by the calculated volumetric shrinkage value.

Micro-injection Molded Polymeric Surfaces for the Maintenance of Human Mesenchymal Stem Cells (hMSCs)

2013 ◽  
Vol 1499 ◽  
Author(s):  
Meghan E. Casey ◽  
John W. Rodgers ◽  
Courtney E. LeBlon ◽  
John P. Coulter ◽  
Sabrina S. Jedlicka
Keyword(s):  
Stem Cells ◽  
Mesenchymal Stem Cells ◽  
Injection Molding ◽  
Silicon Wafer ◽  
Human Mesenchymal Stem Cells ◽  
Mold Insert ◽  
High Volume ◽  
Injection Molding Process ◽  
Molding Process ◽  
Micro Features

ABSTRACTIn this work, we take advantage of injection molding as a high volume and repeatable method to create surface areas for the growth of human mesenchymal stem cells (hMSCs). Ultraviolet lithography, combined with deep reactive ion etching, was used to generate micro-features over a relatively large surface area of a silicon wafer. The micro-featured silicon wafer was used as a mold insert for the micro-injection molding process to create polystyrene and low density polyethylene surfaces. Micro-geometry was used to alter the effective surface stiffness of the polymer substrate. Created samples were characterized via scanning electron microscopy and tensile testing. hMSCs were seeded onto samples for initial studies. Actin and vinculin were visualized through ICC to compare cytoskeletal elements. Changes in cell morphology were examined using ICC. Results indicate that injection molding of microfeatured substrates is a viable technique to produce surfaces amenable to stem cell growth.

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