Effect of process conditions on the dart impact properties of thin-wall injection-molded polycarbonate plates

2012 ◽  
Vol 127 (3) ◽  
pp. 1466-1474 ◽  
Author(s):  
Jong-Sin Moon ◽  
Jeong-Moo Lee ◽  
Shi-Ho Lee ◽  
Byoung-Ho Choi
Keyword(s):  
Process Conditions ◽  
Thin Wall ◽  
Impact Properties ◽  
Injection Molded ◽  
Wall Injection

scholarly journals Correlation of Processing, Inner Structure, and Part Properties of Injection Moulded Thin-Wall Parts on Example of Polyamide 66

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Dietmar Drummer ◽  
Steve Meister
Keyword(s):  
Cooling Rate ◽  
Injection Moulding ◽  
Degree Of Crystallinity ◽  
Process Conditions ◽  
Thin Wall ◽  
Polyamide 66 ◽  
Slow Cooling ◽  
Cooling Conditions ◽  
Internal Structures ◽  
Wall Injection

In micro- and thin-wall injection moulding the process conditions affect the developed internal structures and thus the resulting part properties. This paper investigates exemplarily on polyamide 66 the interactions of different cooling conditions on the morphological and crystalline structures. The investigations reveal that a slow cooling rate of the melt results in a homogeneous morphology and a higher degree of crystallinity and also a favoured crystalline structure. Consequently, the dielectric behaviour and light transmitting part properties are affected.

Simulations on structure performance of 3C thin-wall injection-molded parts

2002 ◽  
Vol 86 (12) ◽  
pp. 3064-3071 ◽  
Author(s):  
Shia-Chung Chen ◽  
Hsing-Ling Wang ◽  
Juan-Po Chen ◽  
Hsin-Shu Peng
Keyword(s):  
Thin Wall ◽  
Molded Parts ◽  
Injection Molded ◽  
Wall Injection

Investigations on the Weldline Tensile Strength of Thin-wall Injection Molded Parts

2004 ◽  
Vol 23 (6) ◽  
pp. 575-588 ◽  
Author(s):  
Rean Der Chien ◽  
Shia-Chung Chen ◽  
Hsin-Shu Peng ◽  
Pao-Lin Su ◽  
Chun-Sheng Chen
Keyword(s):  
Tensile Strength ◽  
Thin Wall ◽  
Molded Parts ◽  
Injection Molded ◽  
Wall Injection

Investigation on the weldline strength of thin-wall injection molded ABS parts

2007 ◽  
Vol 34 (4) ◽  
pp. 448-455 ◽  
Author(s):  
Chun-Sheng Chen ◽  
Tsyr-Jang Chen ◽  
Rean-Der Chien ◽  
Shia-Chung Chen
Keyword(s):  
Thin Wall ◽  
Injection Molded ◽  
Wall Injection

Correlation Between Mechanical Properties in Standard Test Specimens and Injection Molded Thin-Wall Parts

2013 ◽  
Author(s):  
Laurentiu I. Sandu ◽  
Felicia Stan ◽  
Catalin Fetecau
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Yield Strength ◽  
Injection Molding ◽  
Process Conditions ◽  
Thin Wall ◽  
Optimal Process ◽  
Melt Temperature ◽  
Molded Parts ◽  
Injection Molded

In this paper, we investigated the effect of injection molding parameters on the mechanical properties of thin-wall injection molded parts. A four-factor (melt temperature, mold temperature, injection speed and packing pressure) and three-level fractional experimental design was performed to investigate the influence of each factor on the mechanical properties and determine the optimal process conditions that maximize the mechanical properties of the part using the signal-to-noise (S/N) ratio response. The mechanical properties (e.g., elastic modulus, yield strength and strain at break) were measured by tensile tests at room temperature, at a crosshead speed of 5 mm/min, and compared with those of the injection-molded specimens. The experimental results showed that the tensile properties were highly dependent on the injection molding parameters, regardless of the type of the specimens. The values of Young modulus and yield strength of the injection-molded specimens were lower than those of the injection-molded parts, while the elongation at break was considerably lower for the injection-molded parts. The optimal process conditions were strongly dependent on the measured performance quantities (elastic modulus, yield strength and strain at break).

Investigations of the Tensile Properties on Polycarbonate Thin-Wall Injection Molded Parts

2003 ◽  
Vol 22 (5) ◽  
pp. 479-494 ◽  
Author(s):  
Shia-Chung Chen ◽  
Hsin-Shu Peng ◽  
Lei-Ti Huang ◽  
Ming-Shiu Chung
Keyword(s):  
Tensile Properties ◽  
Thin Wall ◽  
Molded Parts ◽  
Injection Molded ◽  
Wall Injection

Micro-Injection Molding of Polymer Nanocomposites Composition-Process-Properties Relationship

2021 ◽  
Vol 36 (3) ◽  
pp. 276-286
Author(s):  
Z. Dekel ◽  
S. Kenig
Keyword(s):  
Mechanical Properties ◽  
Plug Flow ◽  
Volume Resistivity ◽  
Process Conditions ◽  
Polyamide 66 ◽  
Fountain Flow ◽  
Microinjection Molding ◽  
Injection Molded ◽  
Composition Process ◽  
Rheological Percolation

Abstract The mechanical, electrical, thermal, and rheological properties of micro injection molded nanocomposites comprising 2% and 5% carbon nanotubes (CNTs) incorporated in polycarbonate (PC), and polyamide 66 (PA) were studied. The design of experiments method was used to investigate the composition-process – properties relationship. Results indicated that the process variables significantly affected the flow patterns and resulting morphology during the filling stage of the microinjection molding (lIM) process, using 0.45 mm diameter lIM samples. Two distinct flow regimes have been identified in lIM using the low cross-section samples. The first was a conventional “fountain flow,” which resulted in a skin/core structure and reduced volume resistivity up to 10 X cm in the case of 5% CNTs and up to 100 X cm in 2% CNTs, in both polymers, respectively. In addition, inferior mechanical properties were obtained, attributed to polymer degradation under high shear rate conditions, when practicing high injection speeds, high mold temperatures, and high screw rotation velocities. The second was a “plug flow” due to wall slippage, obtained under low injection speeds, low mold temperatures, and low rotation velocities, leading to a substantial increase in modulus of elasticity (60%) with increased electrical resistivity up to 103 X cm for 5% CNTs and 105 X cm for 2% CNTs, respectively. The rheological percolation threshold was obtained at 2% CNTs while the electrical threshold was attained at 0.4% CNTs, in both polymers. It was concluded that in lIM, the process conditions should be closely monitored. In the case of high viscous heating, degradation of mechanical properties was obtained, while skin- core morphology formation enhanced electrical conductivity.

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