scholarly journals Prevention of Defects in Injection Molding Process in the Manufacturing of Ballpoint Pen

2019 ◽  
Vol 8 (3) ◽  
pp. 4932-4937
Keyword(s):  
Injection Molding ◽  
Weld Line ◽  
Close Relation ◽  
Injection Molding Process ◽  
Molding Machine ◽  
Molding Process ◽  
Injection Molding Machine ◽  
Preventive Actions ◽  
Sink Mark ◽  
Ball Point

Injection molding is one of the major manufacturing processes for thermoplastic polymers. In injection molding machine, process variables play a very important role in generating defects in products. In the present paper manufacturing of ball point pen is taken up to investigate the prevention of defects through design and controlling various process parameters. Two molds are designed and fabricated specially for this experimental work. The analysis showed that the defect occurrence has close relation with pressure, speed and the temperature of the injection molding machine in addition to the basic design of the mold. The paper suggests preventive actions for the defects like flash, burn marks, short shot, shrinkage, weld line, warpage and sink mark. The preventive actions were successfully implemented in manufacturing the ball point pen.

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.

Experimental Study on Mold Separations of Plastic Injection Molding Machines with Different Clamping Units

2009 ◽  
Vol 87-88 ◽  
pp. 64-68 ◽  
Author(s):  
Pan Pan Zhang ◽  
Peng Cheng Xie ◽  
Dai Hua ◽  
Wei Min Yang
Keyword(s):  
Injection Molding ◽  
Value Added ◽  
Plastic Injection Molding ◽  
Injection Molding Process ◽  
Hydraulic Pressure ◽  
Molding Machine ◽  
Molding Process ◽  
Injection Molding Machine ◽  
Plastic Injection ◽  
Value Added Products

The plastic injection molding is widely used for the manufacturing of complicated-shaped and high value-added products. The plastic injection molding machine is the most important equipment for the industry. This paper focuses on the mold separation (MS) of the injection molding machines. The characteristics of the MS of injection molding machine with different clamping units are systemically analyzed, the five-hinge joint-double toggle clamping unit and the direct hydraulic pressure clamping unit included. The study points out there are several typical differences between the different clamping units. Meanwhile, it shows there is a linear relation between the MS value and the product weight, and explains why the MS signal can be used to control the injection molding process.

scholarly journals Design of Multimodel based MPC and IMC control schemes applied to injection molding machine

2014 ◽  
Vol 3 (2) ◽  
pp. 82
Author(s):  
Kanaga Lakshmi ◽  
D. Manamalli ◽  
M. Mohamed Rafiq
Keyword(s):  
Injection Molding ◽  
Temperature Control ◽  
Weighted Average ◽  
Injection Molding Process ◽  
Monitoring And Control ◽  
Molding Machine ◽  
Molding Process ◽  
Melt Temperature ◽  
Injection Molding Machine ◽  
And Control

Good control of plastic melt temperature for injection molding is very important in reducing operator setup time, ensuring product quality, and preventing thermal degradation of the melt. The controllability and set points of barrel temperature also depend on the precise monitoring and control of plastic melt temperature. Motivated by the practical temperature control of injection molding, this paper proposes MPC and IMC based control scheme. A robust system identification and control methodology is developed which uses canonical varieties analysis for identification and model predictive control for regulation. The injection molding process consists of three zones and the mathematical model for each of the zone is different. The control output for each zone controller is assigned a weight based on the computed probability of each model and the resulting action is the weighted average of the control moves of the individual zone controllers. Keywords: Injection-Molding Machine (IMM), IMC Control, Temperature Control.

SHEAR HEATING PARAMETER OF RUBBER COMPOUNDS USEFUL FOR PROCESS CONTROL IN INJECTION MOLDING MACHINE

2020 ◽  
Vol 93 (4) ◽  
pp. 729-737
Author(s):  
Mattia Ramini ◽  
Silvia Agnelli
Keyword(s):  
Process Control ◽  
Injection Molding ◽  
Thermal History ◽  
Laboratory Tests ◽  
Injection Molding Process ◽  
Measured Temperature ◽  
Molding Machine ◽  
Injection Molding Machine ◽  
Rubber Compounds ◽  
Shear Heating

ABSTRACT Control of the injection molding process of rubber is made complex by the influence of many parameters. Shear heating, heat generation due to viscous dissipation, is a phenomenon largely exploited in rubber to lower compound viscosity, particularly in the extrusion phase, but it is impossible to predict it from laboratory tests. With the aim of providing useful tools for process control, a parameter for on-line monitoring of shear heating phenomenon is proposed. This parameter is based on direct measurement of rubber surface temperature by infrared thermal camera at the nozzle outlet of the injection molding machine extruder. The measured rubber temperature is a process indicator to give the thermal history of the rubber injection and process safety. Measured temperature increase is then converted into a parameter having dimensions of viscosity, the shear heating parameter, ηSH. Four different rubber compounds are investigated. The ηSH results are compared to minimum torque (ML) from routine rheometric laboratory measurement. The calculated ηSH values increase with increasing ML values. The ML value is a rough indication of the rubber compound viscosity, where its relevant variations affect the rubber processability. Meanwhile ηSH is more sensitive to small processability variations and more accurate because it takes into account the thermal history during the injection stage. The found relationship provides deeper insights into the behavior of rubber, compared to laboratory tests, and how it can be used in the industrial practice to improve the process control by monitoring the shear heating effect during the injection stage.

scholarly journals Injection Molding Process Control of Servo–Hydraulic System

2019 ◽  
Vol 10 (1) ◽  
pp. 71
Author(s):  
Chun-Ying Lin ◽  
Fang-Cheng Shen ◽  
Kuo-Tsai Wu ◽  
Huei-Huang Lee ◽  
Sheng-Jye Hwang
Keyword(s):  
Injection Molding ◽  
Hydraulic System ◽  
Pid Controller ◽  
Position Control ◽  
Performance Standards ◽  
Pressure Control ◽  
Injection Molding Process ◽  
Proportional Integral Derivative ◽  
Molding Machine ◽  
Molding Process

The present study constructs a servo–hydraulic system to simulate the filling and packing processes of an injection molding machine. Experiments are performed to evaluate the velocity and position control of the system in the filling stage and the pressure control in the packing stage. The results demonstrate that the proposed system meets the required performance standards when operated with the proportional-integral–derivative (PID) controller under a sampling frequency of 1000 Hz.

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