• Title/Summary/Keyword: Photopolymer Resin

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Evaluation of mechanical properties of polylactic acid and photopolymer resin processed by 3D printer fused deposition modeling and digital light processing at cryogenic temperature

  • Richard G. Pascua;Gellieca Dullas;SangHeon Lee;Hyung-Seop Shin
    • Progress in Superconductivity and Cryogenics
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    • v.26 no.2
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    • pp.19-23
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    • 2024
  • 3D printing has the advantage of being able to process various types of parts by layering materials. In addition to these advantages, 3D printing technology allows models to be processed quickly without any special work that can be used in different fields to produce workpieces for various purposes and shapes. This paper deals to not only increase the utilization of 3D printing technology, but also to revitalize 3D printing technology in applications that require similar cryogenic environments. The goal of this study is to identify the mechanical properties of polylactic acid and photopolymer resin processed by Fused Deposition Modeling (FDM) and Digital Light Processing (DLP) respectively. The entire process is meticulously examined, starting from getting the thermal contraction using an extensometer. A uniaxial tensile test is employed, which enables to obtain the mechanical properties of the samples at both room temperature (RT) and cryogenic temperature of 77 K. As the results, photopolymer resin exhibited higher tensile properties than polylactic acid at RT. However, at cryogenic temperatures (77 K), the photopolymer resin became brittle and failure occurred due to thermal contraction, while polylactic acid demonstrated superior tensile properties. Therefore, polylactic acid is more suitable for lower temperatures.

Experiment to Select Materials for the Conservation and Restoration of a Glass Ewer, Korean National Treasure No.193 (국보 제193호 봉수형유리병의 재보존처리에 사용할 복원재료 선정 실험)

  • Hwang, Hyunsung;Koh, Minjeong;Lim, Sookyung;Lee, Dahae
    • Conservation Science in Museum
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    • v.15
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    • pp.26-37
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    • 2014
  • The Department of Conservation Science at the National Museum of Korea carried out conservation treatment on a prized glass ewer Designated as Korean National Treasure No.193 in order to enhance the ewer's structural stability and restore its true color and transparency. Prior to the conservation treatment, experiments were conducted on various materials e.g., Epoxy Resin, Acrylic Resin, Photopolymer Resin, Water Glass in order to select the most suitable materials for glass conservation. As a result, cyanoacrylate, acrylic, and photopolymer resin were found to be the most appropriate as adhesives, and acrylic resin was an appropriate restoration material. Notably, however, cyanoacrylate resin must not be used solely, and epoxy resin must be detachable.

Comparison of shrinkage according to thickness of photopolymerization resin for 3D printing (3D 프린팅용 광 중합 수지의 두께에 따른 수축 비교)

  • Kim, Dong-Yeon;Kim, Jae-Hong
    • Journal of Technologic Dentistry
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    • v.43 no.1
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    • pp.1-5
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    • 2021
  • Purpose: To perform a comparative study on curing shrinkage according to the thickness of photopolymerization resin. Methods: Stainless steel molds of 2, 4, and 6 mm heights were prepared. The 2, 4, and 6 mm-height molds were classified as the 2H, 4H, and 6H groups, respectively. A photopolymerization resin was injected into the stainless steel mold. Photopolymerization was carried out using a photopolymer machine. During photopolymerization, the wavelength and intensity of 400~405 nm were set to 10, the highest intensity among 1~10. Photopolymerization was performed for 30 min per specimen (each group=10). The inner and outer areas of the specimen were measured. The data were analyzed using one-way ANOVA and Kruskal-Wallis H test (α=0.05). Results: In terms of the inner and outer diameters of the photopolymerization resin specimen, the 2H group contracted the most, whereas the 6H group contracted the least. A statistically significant difference was found between the groups (p<0.05). Conclusion: The amount of light irradiation of the photopolymerization resin must be adjusted according to the thickness.

The basic study on the surface treatment of aluminum substract for lithography (평판인쇄용 Aluminum지지체의 표면처리에 관한 기초연구)

  • 황찬/
    • Journal of the Korean Graphic Arts Communication Society
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    • v.12 no.1
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    • pp.17-34
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    • 1994
  • Recently, the photopolymer made of novolak resin as the base and the naphthoquinonediazide(NQD) as the photoreactive compound is used for the presensitized plate(PS plate). The reaction mechanism of the NQD-novolak resin on light exposure is considered. Upon exposure it undergoes a Wolff rearrangement, via ketene intermediate which react with water ti form an 3-indene carboxylic acid. It was also found that NQD type resin in this experiment shows a high relative sensitivity compared with imported sample from Japan.

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Shape accuracy and curing characteristics of photopolymer during fabrication of three-dimensional microstructures using microstereolithography (마이크로광조형법을 이용한 미세삼차원구조물의 제조공정 중 형상정밀도 및 경화특성에 관한 연구)

  • Jung, Dae-Jun;Kim, Sung-Hoon;Jeong, Sung-Ho
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.1
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    • pp.46-50
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    • 2004
  • The curing characteristics of a liquid photopolymer during microstereolithography and the shape accuracy of thereby fabricated microstructures were investigated experimentally. A He-Cd laser with a wavelength of 442nm and a photopolymer consisted of a commercial resin from SK chemical and a photoinitiat or were used for the experiment. By varying the laser beam power and scanning speed of the focused laser beam, minimum curing thickness of 50 ${\mu}ㅡ$ was obtained. The distortion of solidified structure due to adhesion force was measured and the optimum fabrication conditions were determined. Also, the feasibility of direct fabrication of three-dimensional microstructures by Super IH process was examined.

A Study on the Direct Casting of Photo-polymer (포토 폴리머의 직접 주조에 관한 연구)

  • Kim, Woo-Soon;Kim, Dong-Hyun
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.15 no.6
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    • pp.127-133
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    • 2006
  • Rapid prototyping technologies have been widely used to reduce the development cost of new products. Manufacturing industries are nowadays characterized by the flexibility and complexity of products. This to due to the rapid development of manufacturing technology and diverse needs of customers. In this paper, the best homing out and casting condition for getting casting product of resin pattern(photopolymer) have been examined experimentally. In generally, the burning out and casting conditions have effect on the casting products. Using the direct casting. we directly Producted the Jewelry. And in this paper, we used only gypsum. Many study of casting for resin have been used to dental investment. A dental investment is good for resin casting. but dental investment is too hard and not useful on the jewelry casting. Therefore we need to find the way of resin casting by gypsum.

Cure Properties in Photopolymer for Stereolithography according to Variance of Laser Beam Size (레이저빔 크기변화에 따른 광조형수지의 경화특성)

  • 이은덕;심재형;백인환
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.2
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    • pp.76-84
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    • 2003
  • Stereolithography is the technique using a laser beam to cure a liquid resin, a photopolymer, with three dimensional computer-aided design (CAD) data. The build parameters of stereolithography such as beam size, scan velocity. hatch spacing, layer thickness and etc. are determined by the accuracy of prototype, the build time and the cured properties of the resin. In particular, beam size is important processing parameter fur the other parameters. Therefore, this study observed the cured property to beam size. For this purpose, according to hatch spacing and beam size, the cure width and depth were measured on single cured line. Also, the cure width and depth were measured at single cured layer As a result of experiments. cure depth which varied from 0.23mm to 0.34mm was directly proportioned to beam radius. on the other hand, cure width which varied from 0.42mm to 1.07mm was inversely proportioned to beam radius. Surface roughness varied from 1.12 to 2.23 m for the ratio of hatch spacing to beam radius.