Investigation of mold plate separation in thin-wall injection molding

2003 ◽  
Vol 22 (4) ◽  
pp. 306-319 ◽  
Author(s):  
Shia-Chung Chen ◽  
Wei-Liang Liaw ◽  
Pao-Lin Su ◽  
Ming-Hsiu Chung
Keyword(s):  
Injection Molding ◽  
Thin Wall ◽  
Mold Plate ◽  
Plate Separation ◽  
Wall Injection

Anisotropic multilayer conductive networks in carbon nanotubes filled polyethylene/polypropylene blends obtained through high speed thin wall injection molding

Polymer ◽  
2013 ◽  
Vol 54 (23) ◽  
pp. 6425-6436 ◽  
Author(s):  
Feilong Yu ◽  
Hua Deng ◽  
Qin Zhang ◽  
Ke Wang ◽  
Chaoliang Zhang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Injection Molding ◽  
High Speed ◽  
Thin Wall ◽  
Wall Injection ◽  
Polypropylene Blends

Analysis of Residual Stress in Thin Wall Injection Molding

2006 ◽  
Vol 306-308 ◽  
pp. 1331-1336
Author(s):  
H.K. Lee ◽  
J.C. Huang ◽  
G.E. Yang ◽  
Hong Gun Kim
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Injection Molding ◽  
Molecular Orientation ◽  
Polymeric Materials ◽  
Residual Stress Distribution ◽  
Thin Wall ◽  
Flow Paths ◽  
Wall Injection ◽  
Relationship Of

A relationship of residual stress distribution and surface molding states on polymeric materials is presented in thin-walled injection molding. The residual stress is computed by computational numerical analysis, observed with stress viewer and birefringence. The residual stress on polymeric parts can allude the surface quality as well as flow paths. The residual stress distribution on polymeric parts is related with thickness, gate layout, and polymer types. Molecular orientation on polymeric parts is also important in thin wall injection molding. The residual stress and molecular orientation are related to the surface molding states intimately. Analysis of the residual stress is validated through photo-elastic method and surface molding states..

scholarly journals The Feasibility of an Internal Gas-Assisted Heating Method for Improving the Melt Filling Ability of Polyamide 6 Thermoplastic Composites in a Thin Wall Injection Molding Process

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1004 ◽  
Author(s):  
Thanh Trung Do ◽  
Tran Minh The Uyen ◽  
Pham Son Minh
Keyword(s):  
Injection Molding ◽  
Heating Rate ◽  
Temperature Control ◽  
Cavity Surface ◽  
Heating Process ◽  
Injection Molding Process ◽  
Thin Wall ◽  
Molding Process ◽  
Filling Ability ◽  
Wall Injection

In thin wall injection molding, the filling of plastic material into the cavity will be restricted by the frozen layer due to the quick cooling of the hot melt when it contacts with the lower temperature surface of the cavity. This problem is heightened in composite material, which has a higher viscosity than pure plastic. In this paper, to reduce the frozen layer as well as improve the filling ability of polyamide 6 reinforced with 30 wt.% glass fiber (PA6/GF30%) in the thin wall injection molding process, a preheating step with the internal gas heating method was applied to heat the cavity surface to a high temperature, and then, the filling step was commenced. In this study, the filling ability of PA6/GF30% was studied with a melt flow thickness varying from 0.1 to 0.5 mm. To improve the filling ability, the mold temperature control technique was applied. In this study, an internal gas-assisted mold temperature control (In-GMTC) using different levels of mold insert thickness and gas temperatures to achieve rapid mold surface temperature control was established. The heating process was observed using an infrared camera and estimated by the temperature distribution and the heating rate. Then, the In-GMTC was employed to produce a thin product by an injection molding process with the In-GMTC system. The simulation results show that with agas temperature of 300 °C, the cavity surface could be heated under a heating rate that varied from 23.5 to 24.5 °C/s in the first 2 s. Then, the heating rate decreased. After the heating process was completed, the cavity temperature was varied from 83.8 to about 164.5 °C. In-GMTC was also used for the injection molding process with a part thickness that varied from 0.1 to 0.5 mm. The results show that with In-GMTC, the filling ability of composite material clearly increased from 2.8 to 18.6 mm with a flow thickness of 0.1 mm.

Warpage phenomenon of thin-wall injection molding

2010 ◽  
Vol 55 (5-8) ◽  
pp. 517-526 ◽  
Author(s):  
Yuh-Chyun Chiang ◽  
Hsin-Chung Cheng ◽  
Chiung-Fang Huang ◽  
Jeou-Long Lee ◽  
Yi Lin ◽  
...  
Keyword(s):  
Injection Molding ◽  
Thin Wall ◽  
Wall Injection

Numerical and Experimental Study on the Injection Moulding of a Thin-Wall Complex Part

2008 ◽  
Author(s):  
Catalin Fetecau ◽  
Ion Postolache ◽  
Felicia Stan
Keyword(s):  
Injection Molding ◽  
Injection Pressure ◽  
Mold Temperature ◽  
Processing Parameters ◽  
Injection Molding Process ◽  
Thin Wall ◽  
Molding Process ◽  
Complex Part ◽  
Filling Time ◽  
Wall Injection

The research presented in this paper involves numerical and experimental efforts to investigate the relative thin-wall injection molding process in order to obtain high dimensional quality complex parts. To better understand the effects of various processing parameters (the filling time, injection pressure, the melting temperature, the mold temperature) on the injection molding of a thin-wall complex part, the molding experiments are regenerated into the computer model using the Moldflow Plastics Insight (MPI) 6.1 software. The computer visualization of the filling phase allows accurate prediction of the location of the flow front, welding lines and air traps. Furthermore, in order to optimize the injection molding process, the effects of the geometry of the runner system on the filling and packing phases are also investigated. It is shown that computational modeling could be used to help the process and mold designer to produce accurate parts.

Residual Stress and Surface Molding Conditions in Thin Wall Injection Molding

2005 ◽  
Vol 9 ◽  
pp. 137-142
Author(s):  
H.K. Lee ◽  
G.E. Yang ◽  
Hong Gun Kim
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Injection Molding ◽  
Molecular Orientation ◽  
Polymeric Materials ◽  
Residual Stress Distribution ◽  
Thin Wall ◽  
Flow Paths ◽  
Wall Injection ◽  
Polymer Type

Residual stress distribution and surface molding state of polymeric materials are presented for thin-walled injection molding. The residual stress is computed by computational numerical analysis, observed with a stress viewer and birefringence. The residual stress on the surface of the polymeric part can indicate the surface quality as well as flow paths. The residual stress distribution of the polymeric part is related with the part’s thickness, the gate layout, and the polymer type. Molecular orientation, affected by flow paths, is simulated and validated by observing the birefringence of the polymeric specimens. The residual stress and molecular orientation are closely related to the surface molding states.

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