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R&D Reports

vol. 2009 - I (2009.5.29 issue)

Development and Simulation of Extrusion Lamination Process with Polyethylene

Extrusion lamination is one of the techniques used for laminating different materials, and is widely used as the manufacturing process for packaging films for products such as foods, cosmetics and pharmaceutical products in order to obtain improved film properties such as gas barrier, heat sealing and film strength. Autoclave-type high-pressure low-density polyethylene (PE-HPLD) is generally used in extrusion lamination applications because of its good neck-in property. Recently, however, the packaging industry has desired reductions in the volume of materials and high-speed processing. Therefore, plastic resins with good draw down properties are needed. Sumitomo Chemical Co., Ltd. has developed a tubular-type PE-HPLD which exhibits a good balance of neck-in and draw down properties, although neck-in and draw down properties have a trade-off relation. In this article we investigated the effects of shapes of deckles, and setting positions of deckles and rods on extrusion processing properties. As a result, we made their relations clear. Furthermore, we also carried out a viscoelastic simulation of the extrusion lamination process using computer aided engineering developed by Sumitomo Chemical Co., Ltd. The simulation could predict the neck-in phenomenon and thickness distribution for extruded PE-HPLD.
( 4~13 by Makoto MORIKAWA,Yasushi MASUTANI,Seiji SHIROMOTO )

Development of a Highly Active Visible Light Driven Photocatalyst

We had succeeded in the synthesis of a new type of visible light driven photocatalyst called ILUMIO®, which was prepared by an improvement on conventional preparation of ceramics dispersion. The ILUMIO® coated layer decomposes volatile organic compounds (acetaldehyde, formaldehyde and toluene) under fluorescent lamp irradiation. Furthermore, the coated layer exhibits super hydrophilic performance under visible light irradiation. ILUMIO® has dispersing crystalline particles; therefore, the photocatalytic activity is achieved by coating followed by drying without calcination.
( 14~23 by Yoshiaki SAKATANI,Kensen OKUSAKO,Yuko SUYASU,Makoto MURATA,Katsuyuki INOUE,Yasuyuki OKI )

Development of a Novel Microbial Insecticide: Gottsu-A®

Gottsu-A® is a new microbial insecticide containing spores of strain T1 of the entomopathogenic fungus Paecilomyces tenuipes, which was developed by Sumitomo Chemical Co., Ltd. to control chemical resistant whiteflies on greenhouse vegetables. We have succeeded in developing a fermentation process and a subsequent formulation process for P. tenuipes, as well as developing a unique oil flowable formulation with high performance in the stable preservation of P. tenuipes spores. Gottsu-A® has a low toxicity to natural enemy insects and excellent suitability for integrated pest management (IPM) programs using other selective chemicals, physical control tools and beneficial insects. In this report, the development of Gottsu-A® is described focusing on biological information for P. tenuipes, insecticidal performance on whiteflies, formulation design, production process and toxicological studies.
( 24~33 by Takeshi MARUYAMA,Eiji NITTA,Shinya KIMURA,Yoshiki TAKASHIMA,Kenji MATSUMURA,Yoshihito DEGUCHI )

Design and Fabrication of a Multifunctional Light-Guide Plate for LCDs

We developed a two-step design method of diffraction optical elements. In this method diffraction angle and polarization splitting property are adjusted separately by different manners. We also proposed a multifunctional light-guide plate for LCDs that combines the functions of light-guide plate, prism sheet, diffusion sheet, and polarization splitting film. The multifunctional light-guide plate was designed by this two-step design method and was fabricated. The properties of fabricated multifunctional light-guide plate substantially met the design targets.
( 34~40 by Kiman KIM,Masaaki KUBOTA,Kiyoharu NAKATSUKA )

Fitness-For-Service Assessment for Pressure Equipment in Chemical Plants

Fitness-For-Service (FFS) assessments are quantitative engineering evaluations to demonstrate the structural integrity of an in-service component that may contain a flaw or damage. FFS assessment has become popular in the past ten years. One of the reasons why the assessment has become familiar is that some engineering standards have been published. Recently, the engineering standards have evolved to be more international and comprehensive, for example, by the release of a joint American Petroleum Institute (API)/ American Society of Mechanical Engineers (ASME) FFS standard. This paper provides an interpretation of local metal loss assessment procedures based on API/ASME FFS standard and experimental and numerical validation analysis results of FFS assessment.
( 41~51 by Takuyo KAIDA )

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