Thin-wall injection molding of high-density polyethylene for infrared radiation system lenses
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Ryo Kaneda
Abstract
High-density polyethylene (HDPE) lenses are used for infrared radiation (IR) systems, such as radiation thermometers to transmit the IR of the 10 μm region. High IR transmittance and low visible ray (VR) transmittance are necessary for IR system lenses. This experimental investigation of thin-wall injection molding was conducted using 0.5 mm cavity thickness with a disk shape, finished to a mirror-like surface. As factors affecting transmittance, we evaluated the thickness, surface roughness, crystallinity, internal structure, and molecular chain orientation of molded parts, which were produced using four HDPE melt flow rates (MFRs). The changed molding conditions were mold temperature and holding pressure. Results showed that the thin-molded parts had higher IR transmittance. The thin-molded part was obtained with the smallest MFR of 5. Furthermore, the VR transmittance decreased when the molecular chain orientation in the molded parts was small and the crystallinity was high. The small orientation and high crystallinity were obtained simultaneously with the largest MFR of 42. Therefore, it was impossible to obtain high IR transmittance and low VR transmittance simultaneously by a change of MFR. This study confirmed that surface roughness and crystallinity do not affect transmittance.
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- Replication of micro-structured injection molds using physical vapor deposition coating and dynamic laser mold tempering
Articles in the same Issue
- Frontmatter
- Material properties
- Influence of particle size of isotactic polypropylene (iPP) on barrier property against agglomeration of homogenized microcrystalline cellulose (HMCC) in iPP/HMCC composites
- An investigation of the impact of an amino-ended hyperbranched polymer as a new type of modifier on the compatibility of PLA/PBAT blends
- Study on the adhesive properties of reactive liquid rubber toughened epoxy-clay hybrid nanocomposites
- Morphology, rheology and biodegradation of oxo-degradable polypropylene/polylactide blends
- Long term hydrothermal effect on the mechanical and thermo-mechanical properties of carbon nanofiber doped epoxy composites
- Long term accelerated aging investigation of an epoxy/silica nanocomposite for high voltage insulation
- Mechanical and morphological properties of modified halloysite nanotube filled ethylene-vinyl acetate copolymer nanocomposites
- Evaluation of polypropylene hybrid composites containing glass fiber and basalt powder
- Preparation and assembly
- Ibuprofen loaded nano-ethanolic liposomes carbopol gel system: in vitro characterization and anti-inflammatory efficacy assessment in Wistar rats
- Preparation of oriented bacterial cellulose nanofibers by flowing medium-assisted biosynthesis and influence of flowing velocity
- Engineering and processing
- Thin-wall injection molding of high-density polyethylene for infrared radiation system lenses
- Replication of micro-structured injection molds using physical vapor deposition coating and dynamic laser mold tempering
