Development of Advanced Hybrid Polymer Melt Delivery Systems for Efficient High Precision Injection Molding

2020 ◽  
Vol 142 (7) ◽  
Author(s):  
Chandresh Thakur ◽  
Khalid Alqosaibi ◽  
Animesh Kundu ◽  
John P. Coulter
Keyword(s):  
Injection Molding ◽  
Polymer Melt ◽  
Acrylonitrile Butadiene Styrene ◽  
Experimental Investigations ◽  
Liquid Crystal Polymers ◽  
Ansys Fluent ◽  
Engineering Plastics ◽  
Software Modules ◽  
Melt Manipulation ◽  
Butadiene Styrene

Abstract A novel melt manipulation “RheoDrop” concept for hot runner injection molding is presented. In this concept, a controlled rotational shear is applied to a polymer melt in the hot drop to reduce its viscosity without raising the temperature. This is achieved by providing a transient rotational motion to the valve pin in the hot drop. This strategy is developed to mitigate issues associated with cold slug formation during injection molding in hot runner systems. The cold slug formation is particularly relevant for injection molding of engineering plastics such as liquid crystal polymers (LCPs) for medical and electronic applications. Analytical and experimental investigations were performed to validate the concept. The efficacy of the concept is assessed analytically utilizing a combination of two software modules, autodesk, moldflow and ansys fluent. The results confirmed that the concept was able to produce enough shear to reduce the dynamic viscosity between injection molding cycles. A prototype RheoDrop system was designed and developed and retrofitted in a four drop hot runner system mold to experimentally validate the concept. Preliminary experiments were performed utilizing acrylonitrile butadiene styrene, and parts were successfully fabricated at temperatures that are too low for traditional molding in a hot runner system.

Experimental Investigation of the Adhesion Between Thermoplastic Polyurethane and Acrylonitrile-Butadiene-Styrene Substrate

2014 ◽  
Author(s):  
Felicia Stan ◽  
Catalin Fetecau
Keyword(s):  
Experimental Investigation ◽  
Injection Molding ◽  
Failure Mechanism ◽  
Interfacial Adhesion ◽  
Room Temperature ◽  
Thermoplastic Polyurethane ◽  
Peel Test ◽  
Acrylonitrile Butadiene Styrene ◽  
Optical Microscope ◽  
Butadiene Styrene

In this paper we investigated the direct-adhesion of Thermoplastic Polyurethane (TPU) to Acrylonitrile-Butadiene-Styrene (ABS). Specimens with an initial pre-crack were obtained by overmolding the TPU onto ABS substrates, at different melt and mold temperatures. The interfacial adhesion between these two dissimilar polymers, represented by the peeling force, was measured directly by using the standard T-peel test at room temperature and at a crosshead speed of 254 mm/min. The peeled fracture surfaces were observed under optical microscope to identify the failure mechanism (adhesive or cohesive). A qualitative correlation was established between the adhesion strength and the injection molding parameters.

Effect of Powder Loading and Binder Materials on Mechanical Properties in Iron-ABS Injection Molding Process

2013 ◽  
Vol 315 ◽  
pp. 582-586 ◽  
Author(s):  
Nasuha Sa'ude ◽  
M. Ibrahim ◽  
Wahab Saidin
Keyword(s):  
Mechanical Properties ◽  
Injection Molding ◽  
Iron Powder ◽  
Acrylonitrile Butadiene Styrene ◽  
Injection Molding Process ◽  
Molding Machine ◽  
Molding Process ◽  
Injection Molding Machine ◽  
Feedstock Material ◽  
Butadiene Styrene

This paper presents the development of a new polymer matrix composite (PMC) feedstock material by the injection molding machine. The material consists of iron powder filled in an acrylonitrile butadiene styrene (ABS) and surfactant powder (binder) material. In this study, the effect of powder loading and binder content on the mechanical properties was investigated experimentally. The detailed formulations of compounding ratio by Brabender Mixer and injection molding machine of the sample specimen was used with various combinations of the new PMC material. Based on the result obtained, it was found that, higher powder loading of iron filler affected the hardness, tensile and flexural strength of PMC material. With 32% iron powder loading in ABS composites increase the flexural force, maximum stress and force of PMC material through an injection molding process.

A Study on Contact Angle and Surface Tension on Copper-ABS for FDM Feedstock

2014 ◽  
Vol 607 ◽  
pp. 747-751 ◽  
Author(s):  
Nasuha Sa'ude ◽  
N.M.A. Isa ◽  
M. Ibrahim ◽  
Mohd Halim Irwan Ibrahim
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Injection Molding ◽  
Acrylonitrile Butadiene Styrene ◽  
Injection Molding Process ◽  
Molding Process ◽  
Volume Percentage ◽  
Surfactant Material ◽  
Feedstock Material ◽  
Butadiene Styrene

This paper presents the development of a new Copper-ABS feedstock material by the injection molding machine. The material consists of copper powder filled in an acrylonitrile butadiene styrene (ABS) binder and surfactant material. In this study, the effect of metal filled ABS and binder content on the contact angle and surface tension was investigated experimentally. The detailed formulations of compounding ratio with various combinations of a new Copper-ABS feedstock was done by volume percentage (vol. %). Based on the result obtained, an increment by vol. % of copper filler in ABS effected on contact angle and surface tension results. With highly filled copper content in ABS composites increase the surface tension value. It can be observed that, the tendency of the liquid surface that allow to resist an external force in PMC material through an injection molding process.

Recycling of engineering plastics from waste electrical and electronic equipments: Influence of virgin polycarbonate and impact modifier on the final performance of blends

2014 ◽  
Vol 32 (5) ◽  
pp. 379-388 ◽  
Author(s):  
Ramesh V ◽  
Manoranjan Biswal ◽  
Smita Mohanty ◽  
Sanjay K Nayak
Keyword(s):  
Acrylonitrile Butadiene Styrene ◽  
High Impact ◽  
Morphological Properties ◽  
Material Recycling ◽  
Engineering Plastics ◽  
Acrylic Ester ◽  
Blending Process ◽  
Impact Modifier ◽  
Poly Acrylonitrile ◽  
Butadiene Styrene

This study is focused on the recovery and recycling of plastics waste, primarily polycarbonate, poly(acrylonitrile-butadiene-styrene) and high impact polystyrene, from end-of-life waste electrical and electronic equipments. Recycling of used polycarbonate, acrylonitrile-butadiene-styrene, polycarbonate/acrylonitrile-butadiene-styrene and acrylonitrile-butadiene-styrene/high impact polystrene material was carried out using material recycling through a melt blending process. An optimized blend composition was formulated to achieve desired properties from different plastics present in the waste electrical and electronic equipments. The toughness of blended plastics was improved with the addition of 10 wt% of virgin polycarbonate and impact modifier (ethylene-acrylic ester-glycidyl methacrylate). The mechanical, thermal, dynamic-mechanical and morphological properties of recycled blend were investigated. Improved properties of blended plastics indicate better miscibility in the presence of a compatibilizer suitable for high-end application.

Tensile and fatigue behavior of layered acrylonitrile butadiene styrene

2015 ◽  
Vol 21 (3) ◽  
pp. 270-278 ◽  
Author(s):  
Sophia Ziemian ◽  
Maryvivian Okwara ◽  
Constance Wilkens Ziemian
Keyword(s):  
Fatigue Life ◽  
Fatigue Testing ◽  
Fatigue Behavior ◽  
Acrylonitrile Butadiene Styrene ◽  
Fatigue Performance ◽  
Experimental Investigations ◽  
Content Type ◽  
Astm Standard ◽  
Fused Deposition ◽  
Butadiene Styrene

Purpose – This paper aims to define the effect of specimen mesostructure on the monotonic tensile behavior and tensile-fatigue life of layered acrylonitrile butadiene styrene (ABS) components fabricated by fused deposition modeling (FDM). Design/methodology/approach – Tensile tests were performed on FDM dogbone specimens with four different raster orientations according to ASTM standard D638-03. Resulting ultimate tensile stresses (UTS) for each raster orientation were used to compute the maximum stress for fatigue testing, i.e. 90, 75, 60 and 50 or 45 per cent nominal values of the UTS. Multiple specimens were subjected to tension – tension fatigue cycling with stress ratio of R = 0.10 in accordance with ASTM standard D7791-12. Findings – Both tensile strength and fatigue performance exhibited anisotropic behavior. The longitudinal (0°) and default (+45/−45°) raster orientations performed significantly better than the diagonal (45°) or transverse (90°) orientations in regards to fatigue life, as displayed in the resulting Wohler curves. Practical implications – Raster orientation has a significant effect on the fatigue performance of FDM ABS components. Aligning FDM fibers along the axis of the applied stress provides improved fatigue life. If the direction of applied stresses is not expected to be constant in given application, the default raster orientation is recommended. Originality/value – This project provides knowledge to the limited work published on the fatigue performance of FDM ABS components. It provides S-N fatigue life results that can serve as a foundation for future work, combining experimental investigations with theoretical principles and the statistical analysis of data.

scholarly journals PENGARUH WAKTU PENGERINGAN MATERIAL ACRYLONITRILE BUTADIENE STYRENE (ABS) TERHADAP CACAT BERCAK PADA PROSES INJECTION MOLDING PLASTIK

2021 ◽  
Vol 12 (1) ◽  
pp. 15
Author(s):  
Basuki Basuki ◽  
Sunaryo Sunaryo
Keyword(s):  
Injection Molding ◽  
Acrylonitrile Butadiene Styrene ◽  
Butadiene Styrene

Bercak merupakan cacat pada permukaan plastik hasil proses injection molding. Penyebabnya adalah adanya kandungan air yang terperangkap. Penelitian ini bertujuan menentukan berapa lama durasi  waktu pengeringan untuk menghilangkan bercak. Caranya dengan menghitung waktu sejak pemanas hopper dinyalakan sampai material plastik digunakan. Sebab satuan waktu merupakan parameter paling mudah dikontrol  oleh pekerja (operator) mesin injeksi. Penelitian dengan cara melakukan proses cetak plastik menggunakan mesin injeksi pada material acrylonitrile butadiene styrene (ABS). Cacat bercak diamati pada permukaan produk hasil cetak. Pengamatan dilakukan secara visual langsung saat produk keluar dari cetakan. Produk yang baik adalah permukaan halus tanpa bercak. Pengeringan terbaik diperoleh pada suhu 84֯C selama 4 jam. Pengeringan kurang dari 4 jam pada produk masih timbul bercak, pengeringan diatas 4 jam merubah warna karena pigment terbakar efek dari terlalu lama dipanaskan.

Novel Thermoplastic Elastomers Based on Acrylonitrile-Butadiene-Styrene Terpolymer (ABS) from Waste Computer Equipment and Nitrile Rubber

2003 ◽  
Vol 76 (5) ◽  
pp. 1145-1163 ◽  
Author(s):  
S. Anandhan ◽  
P. P. De ◽  
S. K. De ◽  
Anil K. Bhowmick ◽  
S. Bandyopadhyay
Keyword(s):  
Acrylonitrile Butadiene Styrene ◽  
Thermoplastic Elastomers ◽  
Nitrile Rubber ◽  
Dynamic Vulcanization ◽  
Force Microscopy ◽  
Atomic Force ◽  
Computer Equipment ◽  
Transmission Electron ◽  
Engineering Plastics ◽  
Butadiene Styrene

Abstract Acrylonitrile-butadiene-styrene terpolymer (ABS) is one of the engineering plastics most frequently used as outer casings for computer equipment such as monitors, keyboards and other similar components. In an attempt to recycle, blends of scrap computer plastics (SCP) based on ABS with nitrile rubber (NBR) were prepared and mechanical properties and morphology were studied. Effect of dynamic vulcanization on the properties of 60/40, 70/30, and 80/20 NBR/SCP blends was assessed. These blends show the thermoplastic elastomeric behavior. Transmission Electron Microscopy (TEM) and Atomic Force Microscopy (AFM) studies show that the dynamically vulcanized NBR particles are dispersed in the ABS matrix. The thermoplastic elastomeric blends show excellent swelling resistance in IRM # 93 oil.

The Development of a Pneumatic Stepping Motor Concept for Valve Based Flow Control During Injection Molding

2007 ◽  
Author(s):  
Akapot Tantrapiwat ◽  
John P. Coulter
Keyword(s):  
Injection Molding ◽  
Position Control ◽  
Low Cost ◽  
Polymer Melt ◽  
Stepping Motor ◽  
Effective System ◽  
Torque Capacity ◽  
One Step ◽  
Melt Manipulation ◽  
Base Application

To develop the control over mold filling during polymer melt manipulation, an alternative way of driving rotary plug valves, which were placed on mold runners, was investigated in this study. During the present investigation, the pneumatic stepping motor concept was explored by designing, fabricating, and testing a specific motor for a target injection molding base application. In order to improve the actuator performance, which is used to drive the valves, a stepping motor driven by a sequence of digital solenoid valves utilizing pressurized air was designed to enhance torque capacity and reduce energy consumption, while maintaining a fixed position for a long period of time. Similar to electromagnetic stepping motors, this pneumatic stepping motor can be driven by a simple switching circuit, which only moves one step for each driving signal without a fading rotation. This mechanism yields an effective system for speed and position control. Although the speed of pressurized air switching is limited by the response time of air solenoid valves that cause a lower rotation output speed, the holding torque and efficiency of this actuator was found to be relatively higher. By using a set of circular pistons aligned so as to actuate on axial wobble gear, the motor produced a very unique motion between the gear and rotor, causing the beneficial characteristics. In this study, the performance of the new motor was tested and compared to a similar size of electromagnetic stepping motor, as well. Thus, this study provides fundamental concepts to develop a suitable actuator for control valves in injection molding at low cost.

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