scholarly journals Numerical simulation on weld line development of injection molding in mold cavity with inserts

2016 ◽  
Vol 65 (6) ◽  
pp. 064601
Author(s):  
Li Qiang ◽  
Li Wu-Ming
Keyword(s):  
Numerical Simulation ◽  
Injection Molding ◽  
Weld Line ◽  
Mold Cavity

Weld-Line Strength of Rubber in Injection Molding: Effect of Injection Factors and Compound Characteristics

2002 ◽  
Vol 75 (1) ◽  
pp. 83-92 ◽  
Author(s):  
M. Seadan ◽  
P. Pongbhai ◽  
P. Thairaj ◽  
T. Watana Kamtornkul
Keyword(s):  
Injection Molding ◽  
Cross Section ◽  
Line Strength ◽  
Weld Line ◽  
Circular Cross Section ◽  
High Viscosity ◽  
Mold Cavity ◽  
Cavity Pressure ◽  
Mooney Viscosity ◽  
Weld Area

Abstract The effect of injection molding system to weld-line strength in rubber O-rings was studied using a V-shape two-stage REP injection machine. Two types of injection molds were designed and built, a standard dumbbell mold with double gates and a circular cross-section O-ring mold. Several formulations of carbon black filled NR and SBR compounds were used and vulcanization temperature was either 180 or 200 °C throughout. The results show that mold cavity pressure, compound viscosity and compound scorch time are important variables for the weld-line strength of the products. The shot volume change had no direct effect on strength, but mold cavity pressure was an important factor; unfilled shot volume gave low cavity pressure thus lowering the weld-line strength of the O-rings. The compounds having 45 or lower Mooney viscosity, ML(1 + 4)120 °C, had the same weld area strength as that of the other regions of the O-ring, but the high viscosity compounds produced low weld-line strength. Only the compounds with Mooney scorch time shorter than 10 minutes gave low weld-line strength.

Visual Experiment Study on the Influence of Mold Structure Design on Injection Molding Product’s Defects

2009 ◽  
Vol 87-88 ◽  
pp. 31-35 ◽  
Author(s):  
Peng Cheng Xie ◽  
Bin Du ◽  
Zhi Yun Yan ◽  
Yu Mei Ding ◽  
Wei Min Yang
Keyword(s):  
Injection Molding ◽  
Experimental Method ◽  
Direct Observation ◽  
Weld Line ◽  
Structure Design ◽  
Mold Cavity ◽  
Experiment Study ◽  
Forming Process ◽  
Visualization System ◽  
Visual Method

Injection molding visualization is the experimental method of direct observation on the melt filling behavior in the mold cavity. By using developed visualization system, the influence of mold structure design on the injection molding product’s defects, such as jetting and weld were studied in this paper. The forming process of jetting was observed by the visual method, and results show that it is useful to avoid jetting by locating gate correctly. According to the generation of weld line in single gate cavity, an improved measure to adjust the weld locations by adding overflow traps was proposed. The result indicates that the overflow trap is good for adjusting weld location and makes the defects appear in the unimportant points of surface. Another experiment on the forming process of weld line in two-gate cavity with setting different distance parameters were carried out. The result shows that increasing of gates distance may significantly affect the performance of weld line.

Numerical Simulation of the Advancing Front in Injection Molding

1991 ◽  
Vol 6 (1) ◽  
pp. 13-18 ◽  
Author(s):  
D. Fauchon ◽  
H. H. Dannelongue ◽  
P. A. Tanguy
Keyword(s):  
Numerical Simulation ◽  
Injection Molding ◽  
Advancing Front

Effect of Weld Line Formation on Morphology and Mechanical Properties for 3D-MID Technology

2015 ◽  
Vol 659 ◽  
pp. 659-665
Author(s):  
Supakit Chuaping ◽  
Thomas Mann ◽  
Rapeephun Dangtungee ◽  
Suchart Siengchin
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Flexural Strength ◽  
Injection Molding ◽  
Filler Content ◽  
Research Work ◽  
Weld Line ◽  
Processing Conditions ◽  
High Reduction ◽  
Flexural Tests

The topic of this research work was to demonstrate the feasibility of a 3D-MID concept using injection molding technique and investigate the effects of two weld line types on the structure and mechanical properties such as tensile, flexural strength and morphology. In order to obtain more understanding of the bonds between polymer and metals, two different polymer bases of polyphthalamide (PPA) with the same type and amount of filler content were produced by injection molding at the different processing conditions. A mold was designed in such a way that weld and meld line can be produced with different angles by changing as insert inside of the mold. The mechanical properties such as stiffness, tensile strength and flexural strength were determined in tensile and flexural tests, respectively. The results showed in line with the expectation of high reduction on mechanical properties in area where weld/meld lines occurred. The result of tensile test was clearly seen that weld and meld line showed a considerable influence on mechanical properties. The reduction in tensile strength was approximately 58% according to weld line types, whereas in flexural strength was approximately 62%. On the other hand, the effect of the injection times and mold temperatures on the tensile strength were marginal.

scholarly journals Study on Numerical Simulation and Experiment of Lightguide Plate in Injection Molding

2004 ◽  
Vol 23 (11) ◽  
pp. 1187-1206 ◽  
Author(s):  
Y. K. Shen ◽  
W. Y. Wu ◽  
S. Y. Yang ◽  
H. M. Jian ◽  
C -C. A. Chen
Keyword(s):  
Numerical Simulation ◽  
Injection Molding ◽  
Simulation And Experiment
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