Effects of process conditions on the heat transfer coefficient at the polymer-mold interface and tensile strength of thin-wall injection molding parts
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Laiyu Zhu
Abstract
Generally, the strength at the weld line of the injection molded part is very weak. The heat transfer coefficient (HTC) between the polymer melt and the mold cavity surface was analyzed to solve this problem. The surface roughness of the mold cavity and the material of the mold insert were changed to adjust the interface environment between the polymer melt and the mold cavity surface. HTC was obtained by combing the experimental measurement with the theoretical calculation. In the current study, the influence of HTC on the tensile strength of the weld line of the molded specimen was investigated. The results show that the weld line strength of the molded specimen increases with the decrease in HTC between the polymer and the mold cavity surface. Meanwhile, the decrease in the surface roughness of the mold cavity or replacing the mold material with lower thermal conductivity can reduce the value of the HTC between the polymer and the mold effectively and can delay the cooling rate of the hot polymer melt. This provides a new idea to solve thin-wall injection molding weld line defects.
Funding source: National Basic Research Program of China
Award Identifier / Grant number: 2012CB025905
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: 51575540
Award Identifier / Grant number: 51405519
Funding statement: The authors would like to acknowledge the financial support from the National Basic Research Program of China (grant no. 2012CB025905) and the support from the National Natural Science Foundation of China, Funder Id: http://dx.doi.org/10.13039/501100001809 (grant nos. 51575540 and 51405519).
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Articles in the same Issue
- Frontmatter
- Material properties
- Effect of temperature on the impact behavior of PVC/ASA binary blends with various ASA terpolymer contents
- The infrared spectroscopy of chitosan films doped with silver and gold nanoparticles
- The effect of the addition of a slip agent on the rheological properties of polyethylene: off-line and in-line measurements
- Analysis of the mechanical properties of polymer materials considering lateral confinement effects
- Effect of gamma irradiation on the physicochemical and rheological properties of enzyme-catalyzed tragacanth-based injectable hydrogels
- Effects of MAH/St grafted nanocellulose on the properties of carbon reinforced styrene butadiene rubber
- Preparation and assembly
- Preparation, characterization and kinetics study of chitosan/PVA electrospun nanofiber membranes for the adsorption of dye from water
- Engineering and processing
- Polymer-induced metal diffusion during plastic processing: a reason for deposit formation
- Optimization of process parameters in plastic injection molding for minimizing the volumetric shrinkage and warpage using radial basis function (RBF) coupled with the k-fold cross validation technique
- Effects of process conditions on the heat transfer coefficient at the polymer-mold interface and tensile strength of thin-wall injection molding parts
