A Study on Flexural Properties of Sandwich Injection Moldings
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H. Hamada
Abstract
In recent years composite materials have been widely used, largely because of their superior mechanical properties. Sandwich constructions can be suitably tailored to make use of each material's properties in the moldings, effectively (for example in honeycomb core constructions) in order to improve the mechanical properties of the moldings. In the injection molding process, however, it is quite difficult to fabricate sandwich constructions. A sandwich injection molding process in which the sandwich injection moldings are performed using two melt sources and one nozzle has been developed. At the present, there have been few investigations with respect to the mechanical properties of the sandwich structures produced by the injection moldings.
In this study, we tried to examine the sandwich construction made by the injection molding process. Three kinds of materials including polyamide resin, the short and the longer fiber reinforced polyamides were used as layer structural materials for the sandwich injection moldings. The flexural properties for the sandwich injection moldings were measured and their fracture surfaces observed to clarify the mechanical behaviors. Furthermore, the flexural moduli for the sandwich injection moldings composed of the polyamides reinforced with the different fiber lengths were predicted based on two-layer orientation model.
© 1993, Carl Hanser Verlag, Munich
Articles in the same Issue
- Contents
- Contents
- Internal Mixers
- Estimation of Quality of Mixing
- Screw Extrusion and Continuous Mixing
- An In-line Rheometer for Molten Plastics
- Melting of Plastics in Kneading Blocks
- Development of Phase Morphology of a Polyethylene-Polyamide 6-Blend in a Modular Co-rotating Twin Screw Extruder
- Microstructure Formation in Extruded and Drawn Polyblends of PC with a Thermotropic LCP
- Die Extrusion
- A Slip Model for Linear Polymers Based on Adhesive Failure
- Film
- Effect of Biaxial Stretching on Mechanical Properties and Surface Roughness of PMMA Films
- Molding
- Dynamics and Control of Surface and Mold Temperatures in Injection Molding
- A Study on Flexural Properties of Sandwich Injection Moldings
- Detailed Investigations of Structural Layering Phenomena in Injection Molded Thermotropic LCP
- Computer Controlled Rotational Molding of Liquid Silicone Polymer
Articles in the same Issue
- Contents
- Contents
- Internal Mixers
- Estimation of Quality of Mixing
- Screw Extrusion and Continuous Mixing
- An In-line Rheometer for Molten Plastics
- Melting of Plastics in Kneading Blocks
- Development of Phase Morphology of a Polyethylene-Polyamide 6-Blend in a Modular Co-rotating Twin Screw Extruder
- Microstructure Formation in Extruded and Drawn Polyblends of PC with a Thermotropic LCP
- Die Extrusion
- A Slip Model for Linear Polymers Based on Adhesive Failure
- Film
- Effect of Biaxial Stretching on Mechanical Properties and Surface Roughness of PMMA Films
- Molding
- Dynamics and Control of Surface and Mold Temperatures in Injection Molding
- A Study on Flexural Properties of Sandwich Injection Moldings
- Detailed Investigations of Structural Layering Phenomena in Injection Molded Thermotropic LCP
- Computer Controlled Rotational Molding of Liquid Silicone Polymer
