• Title/Summary/Keyword: Polyester film

Search Result 118, Processing Time 0.021 seconds

An Innovative Fingerprinting Procedure for Human Identification

  • Kim, Young-Sam;Yoon, Kwang-Sang;Eom, Yong-Bin;Seo, Joong-Seok;Kim, Jong-Bae
    • Biomedical Science Letters
    • /
    • v.15 no.3
    • /
    • pp.187-197
    • /
    • 2009
  • Fingerprinting is a frontier technique that is the most frequently applied for human identification throughout the world. All citizens over 17 year old living in the Republic of Korea must be fingerprinted to obtain a certificate of resident registration. In Korea, for this reason, human identification through fingerprints has been far better developed and used efficiently both in crime scene investigation and in confirmation of an unidentified body. Scientific approaches have been made to accurately extract the metamorphosed fingerprints in various environments. Because most of the studies on fingerprinting have been accomplished with biometric techniques, researches on restoration of human dermal tissue and taking custody data after collecting fingerprints have been comparatively undermined. In this study, a newly innovative method for fingerprint extraction was developed using the polyester film with print powders and the high temperature-moisturizing method. Compared to the conventional fingerprinting method of paper with ink, minutiae numbers of fingerprints were greatly increased in polyester film with print powders after restoration of fingertips by high temperature-moisturization. This newly developed procedure would be an efficient fingerprinting technique which could be utilized in scientific investigation and in personal identification in the future. Furthermore, the new method for restoration and extraction of fingerprints are easy and inexpensive to practice for a number of human identification.

  • PDF

Heating & Drying Characteristics of Coating Layer by Induction Heating and Short-wave Infrared Heating (유도가열 및 근적외선 가열방법에 의한 표면처리 강판 도포층의 가열 및 건조 특성)

  • Kim T. S.;Yang J. W.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • 2004.08a
    • /
    • pp.249-257
    • /
    • 2004
  • Drying and curing characteristics of PCM resins using the induction heater and short-wave infrared emitter module was studied to develop a compact oven system for the high speed CCL and post-treatment equipment. Drying of the polyester resins using the induction heater and infrared heater showed that the blistering tendency of polyester resin coating increased regardless of additives and colors of resins as the heating rate and/or dry film thickness increased. The blistering of polyester resin coating layer occurred when the heating speed was over than $25^{\circ}C/sec$ for the dry film thickness of $19\~20um$, which is the typical thickness of finish coating in CCL. So did it when the heating speed was over than $40^{\circ}C/sec$ for the dry film thickness over than 10 um. The heating efficiency of paint coated steels by the infrared heating was strongly dependent on the colors of paint coating and generally increased for the dark surface and/or coating. But the faster drying of the PCM resin coatings increased the blistering tendency of coating layer. The blistering limit for the typical finish coating by the infrared heating was estimated as the heating rate slower than $20^{\circ}C/sec$ regardless of colors of PCM resins.

  • PDF

Cold Plasma Treatment Effects on the Physicochemical and Biodegradable Properties of a Corn Biomass-containing Polyester Film (옥수수 바이오매스를 함유한 폴리에스터 필름의 물리 화학적 특성과 생분해 특성에 대한 콜드 플라즈마 처리의 영향)

  • Song, Ah Young;Oh, Yoon Ah;Oh, Se Jun;Min, Sea Cheol
    • Korean Journal of Food Science and Technology
    • /
    • v.47 no.2
    • /
    • pp.224-232
    • /
    • 2015
  • The effects of cold plasma (CP) treatments on the physicochemical and biodegradable properties of a corn biomass-containing polyester (CBPE) film were studied. The CBPE film was treated with CP generated by $N_2$, $O_2$, He, Ar, or dry air at 400-900 W and 667 Pa for 10-40 min. The glass transition temperature of the CBPE film ($-30.2--28.6^{\circ}C$) was not affected by the CP treatment, while the elastic modulus and water vapor permeability decreased (p<0.05). The ink printability was improved by the treatment and the improved printability was maintained during storage for 56 days at room temperature. Roughness of the film increased after treatments and the level of roughness appeared to increase during storage. Heat and microbial biodegradability of the CBPE film was improved by the air-CP treatment (p<0.05). These results have demonstrated the potential of applying CP treatments to improve the flexibility, printability, and biodegradability of CBPE films.

Plastic Displays - Latest Developments In Polyester Film For Plastic Electronics

  • Hashimoto, K.;MacDonald, W.A.;Rollins, K.;MacKerron, D.;Eveson, R.;Rustin, R.A.;Rakos, K.
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2005.07a
    • /
    • pp.620-622
    • /
    • 2005
  • DuPont Teijin Films (DTF) have developed a family of films engineered specifically for the flexible electronics market. $Teonex^{(R)}Q65A$ is a biaxially oriented crystalline polyester with an engineered surface and it is emerging as a competitive material for the base substrate in OLED displays and active matrix backplanes. This contribution will describe the properties of this film, its uniquely different property set compared to amorphous high performance films and discuss examples of the film in use in flexible electronic applications.

  • PDF

THE EFFECT OF AN APPLIED BIAS UPON THE REFLECTANCE AND ADHESION OF SILVER FILMS BEING SPUTTER-DEPOSITED ON POLYESTER SUBSTRATE

  • Ri, Eui-Jae;Hoang, Tae-Su
    • Journal of the Korean institute of surface engineering
    • /
    • v.32 no.3
    • /
    • pp.257-264
    • /
    • 1999
  • Thin reflective films are synthesized by using PVD methods with a bright metal of Al or Ag. For purposes of improving the reflectance and adhesion of such films particularly, substrate bias was applied during sputtering (namely, ion-plating) to enhance the deposition process with higher energy. And we succeeded in fabricating a quality silver film which possesses an adhesion of $85{\;}Kg/\textrm{cm}^2$ and a high reflectivity of more than 96%. Both of reflectivity and adhesion are better in case of bias sputtering as controlled than nonbias sputtering, particularly the bias of 50-100 V showed most effective. The microstructures of sample films were examined by using various equipments and the XRD spectrum in particular showed that <111> direction is the preferred growth orientation.

  • PDF

Study on the Improvement of Light Transmittance of Polyester Film (폴리에스터 필름의 광투과도 향상에 대한 연구)

  • Kim, Si-Min;Park, Soo-Young
    • Polymer(Korea)
    • /
    • v.36 no.5
    • /
    • pp.662-667
    • /
    • 2012
  • Poly(ethylene terephthalate) (PET) base films with high light transmittance have been used for the substrate of various functional films in the flat panel display. The effects of the reflective index of coated films, the roughness of the film surface and the content of inorganic silica particles on the light transmittance were studied in this article. Light transmittance was increased by coating a water soluble resin with a low reflective index at an optimum thickness. The roughness of the film did not affect light transmittance when the Ra of the film surface was less than a quarter of the wavelength of incident light. Inorganic silica particles decreased light transmittance due to their absorbance and scattering of the incident light.

Wettability and Water Repellency of Polyester Fabrics Treated by Low Temperture Plasma (저온플라즈마처리에 의한 폴리에스테르직물의 흡수성 및 발수성 변화)

  • 권영아
    • Journal of the Korean Society of Clothing and Textiles
    • /
    • v.19 no.2
    • /
    • pp.317-328
    • /
    • 1995
  • The objective of this study was to determine the effects of low temperature plasma on the surface properties of polyester fabric with respect to wettability and water repellency. Highly wettable polyester fabric surfaces were obtained by oxygen treatment. The improved wettabililty of oxygen plasma treated fabrics decreased with aging time up to 30 days, and then the wettability remained relatively constant and still exhibited significant improvement compared to that of untreated polyester. Water repellency was significantly improved by tetratfluorocarbon plasma treatment. Such an improvement appears due to introduced fluo\ulcornerrine atoms or a thin fluorocarbon film on the fiber surface. Water repellency remained constant in fact, even after 150 days.

  • PDF

Preparation and Physical Properties of PU Flame-Retardant Coatings Using Benzoic Acid Modified Polyester Containing Phosphorus and HDI-Trimer (인 함유 벤조산 변성폴리에스테르와 HDI-Trimer에 의한 PU 난연도료의 제조 및 도막물성)

  • Lee, Ae-Ri;You, Hyuk-Jae;Chung, Dong-Jin;Hahm, Hyun-Sik;Park, Hong-Soo
    • Journal of the Korean Applied Science and Technology
    • /
    • v.21 no.1
    • /
    • pp.62-68
    • /
    • 2004
  • PU flame-retardant coatings (APHD) containing phosphorous were prepared by blending of hexamethylene diisocyanate-trimer, white pigment, dispersing agent, flowing agent, and previously prepared benzoic acid modified polyester (APTB) that contains phosphorous. Physical properties of the prepared APHD were examined. With the introduction of BZA (contained in APTB), the film viscosity and film hardness of APHD decreased. With the introduction of caprolactone group, the flexibility, impact resistance, accelerated weathering resistance of APTBs increased. Flame retardancy of the coatings was tested. In a vertical burning method, APHD shows 210${\sim}$313 seconds, and in a $45^{\circ}$ Meckel burner method, shows 1.3${\sim}$4.0$cm^2$ of char length, which indicates that the coatings are good flame-retardant coatings. Moreover, the amount of afterglow and flame retardancy of the coatings are decreased with increasing BZA content.

The Impact of Thermal Stress, Mechanical Stress and Environment on Dimensional Reproducibility of Polyester Film during Flexible Electronics Processing

  • MacDonald, William A.;Eveson, Robert;MacKerron, Duncan;Adam, Raymond;Rollins, Keith;Rustin, Robert;Looney, M. Kieran;Stewart, John;Hashimoto, Katsuyuki
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2007.08a
    • /
    • pp.448-451
    • /
    • 2007
  • DuPont Teijin $Films^{TM}$ (DTF) have developed engineered substrates specifically for the flexible electronics market. $Teonex^{(R)}$ Q65, $Melinex^{(R)}$ ST506 and ST504 are biaxially oriented crystalline polyesters with the option of planarised surfaces. These films are emerging as competitive materials for the base substrate in OLED displays and active matrix backplanes. Given the demanding dimensional reproducibility requirements in the display applications, it is critical to control the several factors that can influence the film distortion in order to achieve the ultimate performance. This paper will discuss the impact of thermal stress, mechanical stress and the processing environment on dimensional reproducibility of polyester film and give examples of how this impacts on the film in device manufacture.

  • PDF