• 한국정밀공학회지
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• 제20권5호
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• pp.156-163
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• 2003

In order to investigate the possibility of punching process of brittle material by ball impact, the effects of sealing materials about impact damage of soda-lime glass by small spheres were evaluated experimentally. The using of sealing materials in the development of perfect cone crack was more effective than no using of sealing materials. At the sealing materials condition, in the case of 5mm-thick specimen, Copper and PMMA sealing were more effective in producing a perfect cone formation than the other sealing materials. And in the case of 8mm-thick specimen, Aluminum sealing was most effective in producing a perfect cone formation. The impact velocity range over which perfect cones were formed was influenced by both the thickness of specimen and sealing materials. By a proper selection of sealing materials, the application fur industrial technology for hole (or nozzle) punching process of brittle materials is expected.

• Restorative Dentistry and Endodontics
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• 제16권2호
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• pp.33-42
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• 1991

The purpose of this study was to evaluate the sealing properties of the temporary filling materials used in endodontic treatment Access cavities were prepared in 135 extracted human molar teeth. Then, cotton pellets were placed in the pulp chamber until the depth of 5 mm for the temporary filling materials; Caviton, zine oxide-eugenol, double sealing (A) (stopping 15 mm + zinc oxide - eugenol, 3.5mm ) double sealing (B) (stopping 3.0 mm + zinc oxide - eugenol 2.0 mm) and gutta percha stopping. After filling the materials, the teeth were immersed in 1 % methylene blue solutions for 3 days, 1 week and 2 weeks. Then thermal cycling was performed at the temperature of $60^{\circ}C$ and $4^{\circ}C$, followed by longitudinal sections on the center of tooth. Finally, staining on the cotton pellet was evaluated. The following results were obtained. 1. Stopping showed lower marginal sealing quality than Caviton, zinc oxide - eugenol and double sealing. 2. In 1 week group, Caviton showed higher marginal sealing quality than zinc oxide-eugenol, double sealing and stopping. 3. Caviton and double sealing (B) showed a great decrease in marginal sealing quality with the increse of time. 4. Caviton had high marginal sealing quality in 3 day group and 1 week group, but in 2 week group, Caviton showed a great decrease. 5. Double sealing (B) showed fairly high marginal sealing quality in 3 day group, but decreased greatly after 1 week on.

• 한국자원식물학회지
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• 제19권3호
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• pp.436-439
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• 2006

This study was carried out to obtain basic information for optimum storage method of leaf, stem and root of Angelica acutiloba Radix, which is being utilized as major cultivated herbal medicine materials, root of Angelica acutiloba was stored for 3 months in different packing materials and sealing methods, such as punched packing, sealing and vacuum packing. The results are summarized as follows. The loss in weight as influenced by packing materials and sealing degree was the lowest at vacuum packing and complete sealing condition with transparent polyethylene film. The ratio of root rot during the storage period was not significantly different between polyethylene films, but it was significantly different between sealing conditions. Therefore, vacuum packing and complete sealing with polyethylene film are desirable storage condition for Angelica acutiloba Radix.

• 한국건축시공학회지
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• 제5권2호
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• pp.147-152
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• 2005

The purpose of this study is to present a rational approach for estimating the unit price and the amounts of sealing materials of the sealing works. This approach, considering field conditions and sealing materials' characteristics, can optimize the cost of the sealing works as well as that of maintenance. For the study, 10 case buildings for 3 years, built by middle size construction firm, were studied in order to investigate the unit price and the amounts of sealing materials.

• Plant Resources
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• 제5권3호
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• pp.224-227
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• 2002

To develop optimal storage method of root of Zingiberis Rhizoma, which has been grown as major cultural herbal medicine materials, root of Zingiberis Rhizoma, was stored for 10 months with different packing materials and sealing methods. The loss in dry weight as influenced by packing materials and sealing methods was the lowest at vacuum packing and followed by complete sealing methods with transparent polyethylene film. The ratio of root rot during the storage period was not significantly different between packing materials but was significantly different between sealing conditions. Conclusionally, vacuum packing and complete sealing with polyethylene film appears to be optimal for storage of Zingiberis Rhizoma.

• Plant Resources
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• 제4권2호
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• pp.102-106
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• 2001

To develop optimumal storage method of root of Bupleurum falcatum Radix grown on major cultural herbal medicine materials, root of Bupleurum falcatum Radix was stored for 10 months with different packing materials and sealing methods. The loss in dry weight as influenced by packing materials and sealing methods was the lowest at vacuum packing and followed by complete sealing methods with transparent polyethylene film. The ratio of root rot during the storage period was not significantly different between packing materials but was significantly different between sealing conditions. Conclusionally, vacuum packing and complete sealing with polyethylene film appears to be optimal for storage of Bupleurum falcatum Radix.

• 한국식품저장유통학회지
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• 제5권4호
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• pp.315-319
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• 1998

유통을 위한 포도 보존 중 품질에 미치는 영향을 구명하여 보존기간 연장에 효과적인 적정 포장재 제작에 대한 기초자료를 얻고자 포도 캠벨얼리를 공시하여 스치로폴 상자, 마닐라상자 등 6처리를 두어 시험한 결과, 중량감소는 유통일수가 경과함에 따라 많았으며, 처리 간에는 15일 보존시 스치로폴상자에 비해 스치로폴상자+(스치로폴접시 + BioPE 필름밀봉), 스티로폴상자 + (스치로폴접시 + 랩 밀봉)처리가 적었으며, 비정상과는 밀봉구에서 많았으나, 축과는 밀봉으로 인한 수분증발 억제로 인하여 오히려 감소하였다. 외관상 품질 및 식미는 보존기간이 경과할수록 저하되었으나, 5일 보존 시에는 바이오상자 처리 포도의 품질이 우수하였고, 경도는 스티로폴상자 + (스치로폴접시 + 바이오필름) 처리에서 감소 폭이 가장 적었으며, 성분변화는 보존기간 경과에 따른 일정한 경향이 없었으며, 밀봉처리에서 당도의 감소 폭이 컷다.

• 한국재료학회지
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• 제19권11호
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• pp.613-618
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• 2009

We designed new compositions for lead free and low temperature sealing glass frit of $ZnO-V_2O_5-P_2O_5$ system, which can be used for PDP (Plasma Display Panel) or other electronic devices. The $ZnO-V_2O_5-P_2O_5$ system can be used as a sealing material at temperatures even lower than 430$^{\circ}C$. This system, however, showed lower bonding strength with glass substrate compared to commercialized Pb based sealing materials. So, we added $TiO_2$ as a promoter for bonding strength. We examined the effect of $TiO_2$ addition on sealing behaviors of $ZnO-V_2O_5-P_2O_5$ glasses with the data for flow button, wetting angle, temporary & permanent residual stress of glass substrate, EPMA analysis of interface between sealing materials and glass substrate, and bonding strength. As a result, sealing characteristics of $ZnO-V_2O_5-P_2O_5$ system glasses were improved with $TiO_2$ addition, but showed a maximum value at 5 mol% $TiO_2$ addition. The reason for improved bonding characteristics was considered to be the chemical interaction between glass substrate and sealing glass, and structural densification of sealing glass itself.

• 한국재료학회지
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• 제32권10호
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• pp.442-447
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• 2022

Sealing treatment is a post-surface treatment of the plasma spray coating process to improve the corrosion resistance of the coating material. In this study, the effect of the sealing on the corrosion resistance and adhesive strength of the plasma spray-coated alumina coatings was analyzed. For sealing, an epoxy resin was applied to the surface of the coated specimen using a brush. The coated specimen was subjected to a salt spray test for up to 48 hours and microstructural analysis revealed that corrosion in the coating layer/base material interface was suppressed due to the resin sealing. Measurement of the adhesive strength of the specimens subjected to the salt spray test indicated that the adhesive strength of the sealed specimens remained higher than that of the unsealed specimens. In conclusion, the resin sealing treatment for the plasma spray-coated alumina coatings is an effective method for suppressing corrosion in the coating layer/base material interface and maintaining high adhesive strength.

• 한국자원식물학회지
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• 제7권2호
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• pp.183-186
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• 1994

This study was conducted to investigate desirable storage method to major chinese herbal medicine materials, Moutan Radicis Cortex in different packing materials and sealing degree. The loss in weight of Moutan Radicis Cortex as influenced by packing materials was the lowest at complete sealing treatment with transparent or black polyethylene film. The rot ratio of Moutan Radicis Cortex during the storage period was not difference between packing materials, transparent and black polyethylene film, but rot ratio of complete sealing condition was lower than punch ($\phi$J5mm) on polyethylene film.