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.

scholarly journals Investigation on Foamed PP/Nano-CaCO3 Composites in a Combined in-Mold Decoration and Microcellular Injection Molding Process

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 363 ◽  
Author(s):  
Kui Yan ◽  
Wei Guo ◽  
Huajie Mao ◽  
Qing Yang ◽  
Zhenghua Meng
Keyword(s):  
Mechanical Properties ◽  
Injection Molding ◽  
Surface Quality ◽  
Transition Layer ◽  
Cellular Structure ◽  
Vertical Section ◽  
Injection Molding Process ◽  
Caco3 Content ◽  
Microcellular Injection Molding ◽  
Film Side

A combined in-mold decoration and microcellular injection molding (IMD/MIM) method has been used in this paper. The foamed PP/nano-CaCO3 composites were prepared to investigate their mechanical properties, cellular structure, and surface quality. The content of nano-CaCO3 varied from 0 to 10 wt %. The results showed that nano-CaCO3 acted as a reinforcing phase and nucleating agent, which help to improve the mechanical properties of foamed composites. The cellular structure and mechanical properties were optimum when the nano-CaCO3 content was 6 wt %. In the vertical section, the cell size and density of transition layer on the film side was bigger than that on the non-film side. In the parallel section, the cell ratio of length to diameter of transition layer on the film side was smaller than that on the non-film side, and the cell tile angle was larger than that on the non-film side. With nano-CaCO3 content increasing, the surface quality showed a trend of decreasing first and then increasing.

Research on the Flow Characteristics of Polymer Injection Molding under Ultrasonic Vibration and Plastics’ Mechanical Strength

2010 ◽  
Vol 37-38 ◽  
pp. 1092-1100
Author(s):  
Ji Bin Li ◽  
Ke Ke Xu ◽  
Xin Bo Lin ◽  
Xiao Yu Wu ◽  
Guo Li Gao
Keyword(s):  
Mechanical Properties ◽  
Injection Molding ◽  
Ultrasonic Vibration ◽  
Flow Characteristics ◽  
Mechanical Tests ◽  
Impact Testing ◽  
Melt Flow Rate ◽  
Polymer Injection ◽  
Molding Method ◽  
The Impact

In this paper, ultrasonic vibration is adopted and exerted on injection molding in order to improve plastics’ forming ability, and the impact testing is used to analyze different injection parts’ mechanical properties. On the one hand, experiments prove that ultrasonic vibration can increase polymer’s melt flow rate, decrease melt viscosity, and improve injection flowing in mould cavity. On the other hand, the mechanical tests prove that the ultrasonic vibration can improve plastics’ tensile strength, elastic modulus and other mechanical properties. As a result, a weldless ultrasound-assisted injection molding method is recommended.

Metal Injection Molding Method of Ni-Free Austenitic Stainless Steel II - Microstructure and Mechanical Properties

2007 ◽  
Vol 26-28 ◽  
pp. 19-22
Author(s):  
Midori Komada ◽  
Yoshikazu Kuroda ◽  
Ryo Murakami ◽  
Noriyuki Tsuchida ◽  
Yasunori Harada ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Surface Layer ◽  
Injection Molding ◽  
Nitrogen Content ◽  
Tensile Tests ◽  
Metal Injection Molding ◽  
Homogeneous Microstructure ◽  
Molding Method ◽  
Microstructure And Mechanical Properties

Microstructure and mechanical properties of high nitrogen steels whose chemical composition were Fe-17Cr-12Mn-3Mo and that was produced by using metal injection molding method and nitrogen absorption methods were examined. A compact which is furnace cooled from 1573 K has a brittle surface layer with high chromium and nitrogen contents but the surface layer disappears when the compact is held at 1473 K. The compact which is furnace cooled at 1473 K is observed precipitates in the grains and the grain boundary, while the compact which is quenched at 1473 K shows homogeneous microstructure. In the heat treatments at 1473 K for 2, 5, and 10 h, the nitrogen content becomes higher with increasing of holding time. In the holding times of 5 and 10 h, the microstructure is austenite. In the tensile tests, tensile strength becomes larger with increasing of nitrogen content. In the specimen which is conducted the heat treatment at 1473 K for 10 h, tensile strength is about 1,000 MPa and elongation is 80 %, which shows better balance of strength and elongation than SUS304 and SUS316 steels.

CAE Optimization of Hot Runner Sequential Injection Molding for Car Interior Trim Panels

2011 ◽  
Vol 221 ◽  
pp. 460-465
Author(s):  
Lu Lu Yang ◽  
Hui Min Zhang ◽  
Meng Li
Keyword(s):  
Mechanical Properties ◽  
Injection Molding ◽  
Injection System ◽  
Sequential Injection ◽  
Flow Simulations ◽  
Optimization Result

In the injection molding of large and thin plastics parts, multiple gates are used, so many weld lines would generate because melted plastic has more than two directions of flow. The existence of weld 1ine harms not only appearance, but also the mechanical properties of products. The paper studied the method of sequential injection to solve this problem. Taking car door trim panels for example, the flow simulations were done by Moldflow software. Conventional hot runner injection and sequential hot runner injection, different gating locations were compared. Optimization result was got. It was proven that sequential injection system can improve the quality of the surface (especially the weld 1ine) and the performance of the actual products thereby this can be guiding significance for the practical production.

scholarly journals Analysis of the Influence of Microcellular Injection Molding on the Environmental Impact of an Industrial Component

2014 ◽  
Vol 6 ◽  
pp. 793269 ◽  
Author(s):  
Daniel Elduque ◽  
Isabel Clavería ◽  
Ángel Fernández ◽  
Carlos Javierre ◽  
Carmelo Pina ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Environmental Impact ◽  
Injection Molding ◽  
Flexural Modulus ◽  
Green Manufacturing ◽  
Flexural Properties ◽  
Special Device ◽  
Injection Process ◽  
Microcellular Injection Molding ◽  
Green Manufacturing Technology

Microcellular injection molding is a process that offers numerous benefits due to the internal structure generated; thus, many applications are currently being developed in different fields, especially home appliances. In spite of the advantages, when changing the manufacturing process from conventional to microcellular injection molding, it is necessary to analyze its new mechanical properties and the environmental impact of the component. This paper presents a deep study of the environmental behavior of a manufactured component by both conventional and microcellular injection molding. Environmental impact will be evaluated performing a life cycle assessment. Functionality of the component will be also evaluated with samples obtained from manufactured components, to make sure that the mechanical requirements are fulfilled when using microcellular injection molding. For this purpose a special device has been developed to measure the flexural modulus. With a 16% weight reduction, the variation of flexural properties in the microcellular injected components is only 6.8%. Although the energy consumption of the microcellular injection process slightly increases, there is an overall reduction of the environmental burden of 14.9% in ReCiPe and 15% in carbon footprint. Therefore, MuCell technology can be considered as a green manufacturing technology for components working mainly under flexural load.

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.

Sign in / Sign up

Export Citation Format

Share Document