Effects of high-efficiency infrared heating on fiber compatibility and weldline tensile properties of injection-molded long-glass-fiber-reinforced polyamide-66 composites
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Po-Wei Huang
Abstract
Glass fiber composites are prevalent molded materials used in various fields, including aviation engineering, automobile manufacturing, and medical equipment production. The length of a glass fiber affects the mechanical properties of a glass fiber composite. Studies have reported that breakage occurs in long fibers subjected to screw plasticization, injection processes, and geometrical changes in injection molding. Moreover, multigate injection molding can result in weldlines on the final product, consequently reducing its strength. Further exploration is required to determine how product strength is affected by weldlines generated through injection molding with glass fiber composites and how product tensile properties associated with weldlines can be improved. Therefore, this study designed a mold with a vent area and a plug-in mold-surface-heating device to examine changes in the weldlines and tensile properties of long-glass-fiber composite specimens fabricated through injection molding using two melts. The results revealed that fiber length decreased with increasing screw speed; such declines in fiber length affected the tensile strength of the long-glass-fiber-reinforced polyamide-66 composites. In addition, because the arrangement and distribution of the glass fibers were affected by the melt flow rate, melt flow direction, and changes in mold cavity volume, the weldline tensile strength varied with the depth of the vent area. Mold surface heating improved the specimen surface roughness by 5.79% and effectively improved the interfacial adhesion between the fibers and melts, thereby resulting in more favorable weldline tensile strength. This also notably reduced the depth of weldlines produced by the adhesion of two melts.
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- Graphene oxide and zinc oxide decorated chitosan nanocomposite biofilms for packaging applications
- Supramolecular adsorption of cyclodextrin/polyvinyl alcohol film for purification of organic wastewater
- Engineering and processing
- Effects of high-efficiency infrared heating on fiber compatibility and weldline tensile properties of injection-molded long-glass-fiber-reinforced polyamide-66 composites
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Artikel in diesem Heft
- Frontmatter
- Material properties
- Synthesis, characterization and low energy photon attenuation studies of bone tissue substitutes
- The effect of oxygen plasma pretreatment on the properties of mussel-inspired polydopamine-decorated polyurethane nanofibers
- Effects of selected bleaching agents on the functional and structural properties of orange albedo starch-based bioplastics
- Study on the thermal and structural properties of gamma-irradiated polyethylene terephthalate fibers
- Preparation and assembly
- Stereocomplex electrospun fibers from high molecular weight of poly(L-lactic acid) and poly(D-lactic acid)
- Dual-wavelength fluorescent anti-counterfeiting fibers with skin-core structure
- Graphene oxide and zinc oxide decorated chitosan nanocomposite biofilms for packaging applications
- Supramolecular adsorption of cyclodextrin/polyvinyl alcohol film for purification of organic wastewater
- Engineering and processing
- Effects of high-efficiency infrared heating on fiber compatibility and weldline tensile properties of injection-molded long-glass-fiber-reinforced polyamide-66 composites
- Toward the development of polyethylene photocatalytic degradation
