• Title/Summary/Keyword: abrasion peeling

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Optimum Condition of Pellicle Peeling Using Abrasion Peeling Machine and its Characteristics among Chestnut Varieties (Castanea spp.) (마찰식 박피기를 이용한 밤 과실의 내피박피 최적조건 및 품종간 박피특성)

  • Joo, Sukhyun;Kim, Mahn-Jo;Lee, Uk
    • Journal of Korean Society of Forest Science
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    • v.102 no.1
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    • pp.7-14
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    • 2013
  • This study investigated the optimum condition of abrasion peeling machine and pellicle peeling ability of chestnut (Castanea spp.) varieties for the efficient production of peeled chestnuts. The optimum conditions were 50 minutes peeling time and 27 rpm of drum rotation speed and chestnut pellicle peeling ratio was 89.3%. Among 8 Korean chestnut varieties which were peeled under the optimum condition (27 rpm/50 min), 'Tsukuba (89.3%)', 'Tanzawa (72.2%)' and 'Ishizuchi (70.9%)' showed the highest ratio of pellicle peeling ratio. 'Tsukuba' had the most excellent peeled (grade I) chestnuts (77.3%), followed by 'Ishizuchi (46.7%)', and 'Tanzawa (45.0%)'. Regarding the chestnuts quality for commercialization, 'Tsukuba' had the most excellent peeled chestnuts (90.5%), followed by 'Tanzawa (74.8%)', and 'Ishizuchi (74.3%)'. 'Mipung (37.2%)' had the most broken and injured chestnuts and 'Tsukuba (5.9%)' had the least broken and injured chestnuts. Therefore this study concluded that 'Tsukuba' was the superior variety for producing high value-added processed chestnuts.

Peeling Operations of Root Vegetables: Potato, Sweet Potato and Carrot (근채류(감자, 고구마, 당근)의 탈피조작)

  • Lee, Cherl-Ho;Lee, Soon-Woo
    • Korean Journal of Food Science and Technology
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    • v.16 no.3
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    • pp.329-335
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    • 1984
  • The effect of peeling methods, spherecity and weight of potatoes and carrots on the peeling efficiency were investigated. The changes in the surface texture by peeling were estimated by Rheometer and were related to the changes in the microstructure. The optimum mechanical peeling conditions using abrasion type rotary peeler were 90 sec. at 300 rpm for potatoes, 70 sec. at 300 rpm for sweet potatoes and 60 sec. at 300 rpm for carrots. The peeling loss was influenced by the sphericity and weight of the sample. The optimum conditions for alkali peeling were 90 sec. immersion in boiling 10% NaOH solution for potatoes, 300 sec. in boiling 10% NaOH solution for sweet potatoes and 60 sec. in boiling 6% NaOH solution for carrots. Severe damage of surface structure was noticed by alkali peeling, demonstrated by denaturation of starch granules in the cell. The structural damage observed by microscope was related to the reduction of cutting force after peeling.

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Changes in Quality Characteristics of Peeled Chestnut 'Tsukuba' According to Storage Temperature and Peeling Method (저장온도와 박피방식에 따른 '축파' 박피밤의 품질특성 변화)

  • Oh, Sung-Il;Kim, Mahn-Jo
    • Korean Journal of Plant Resources
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    • v.27 no.1
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    • pp.72-79
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    • 2014
  • This study was investigated the changes in quality of peeled chestnut according to peeling method, including abrasion and knife, and 3 kinds of storage temperatures. The weight loss rate of peeled chestnut during storage period was observed in all treatment groups, peeling methods showed no difference of the loss. However, the moisture content of peeled chestnut during storage in all treatments showed a tendency to decrease. Moisture content of the abrasion peeled chestnut in all treatments was higher than that of the knife peeled chestnut. In the case of a, b, and ${\Delta}E$ value of peeled chestnut chromaticity increased during storage in all treatments, whereas, L values decreased during storage. But, browning of abrasion peeled chestnut was higher than that of the knife peeled chestnut. The hardness of the abrasion and knife peeled chestnuts were the highest in $-1^{\circ}C$ storage, soluble solid content was decreased with storage time in all treatments, but showed a tendency to increase within 24 days. Palatability and texture of peeled chestnuts decreased in all treatments during storage period, 15 days after storage decreased rapidly. Thus, results showed that peeled chestnuts stored at $4^{\circ}C$ and $2^{\circ}C$ were rapidly decreased in the quality after 15 days, whereas, peeled chestnuts stored at $-1^{\circ}C$ slowly decrease in the fruit quality. It can be recommended that chestnut in vacuum film is good to maintain at $-1^{\circ}C$ storage for 15 days. Also, if we can reduce the browning of abrasion peeled chestnut, we will produce peeled chestnut of high quality.

Polyurethane-coated Fabric for RF Welding (RF 접합용 폴리우레탄 코팅 직물)

  • Park, Jong-Cheol;Lee, Jin-Uk;Yun, Nam-Sik;;Kim, Hong-Je
    • Proceedings of the Korean Society of Dyers and Finishers Conference
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    • 2008.10a
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    • pp.103-104
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    • 2008
  • Radio-frequency(RF) weldable polyurethane-coated fabric was prepared by knife coating of presetted and cire-finished nylon fabric using optimized coating formulation including RF-sensitive commercial polyurethane resins. The physical properties, adhesion strength, peeling strength, abrasion strength, flexibility, and hydrostatic water resistance of the prepared coated fabric were good enough to show no significant difference with regular coating. Additionally the prepared coated fabric had silky and soft touch without tackiness.

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Evaluation of Color Coating Method for Color Maintenance of Color Asphalt Pavement (칼라 아스팔트 포장의 색채 표면보수를 위한 칼라코팅 공법 성능평가)

  • Park, Tae-Soon
    • International Journal of Highway Engineering
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    • v.13 no.4
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    • pp.93-101
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    • 2011
  • The evaluation of various color coating methods for color maintenance of color asphalt pavement is conducted using the laboratory and field tests on the bus lane. The surface of color asphalt constructed on the bus lane is deteriorated such as changing color and decoloration and abrasion due to the passing of the traffic and time. The total of 9 coating methods were evaluated in this study. The laboratory tests included Ultra violet test, adhesion test and Taber abrasion test and the field tests were british pendulum test and visual survey. The results of tests showed that the different methods showed the their own engineering characteristics and it is dependant upon the main material used. The rubber epoxy material for the main material showed the satisfactory result among the methods tested. However, the performance of the coating methods after 100days are not satisfactory, decoloration, abrasion and peeling up are investigated and need to be studied for the further application in the field.

Surface Properties of Wood-Based Floorings for Under Heating Systems (Ondol) (온돌용 목질마루판의 표면물성)

  • 김종인;박종영;이병후;김현중
    • Journal of the Korea Furniture Society
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    • v.13 no.1
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    • pp.27-37
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    • 2002
  • This study was investigated with the surface properties such as physical and accelerated tests of wood-based floorings. In physical test, hardness and abrasion resistance values of laminate floorings were higher than those of others. The center line average surface roughness($R_a$) of imported laminate flooring was highest value($1.34{\mu}m$) and that of imported solid wood flooring was lowest value($0.62{\mu}m$). In cold resistance and moist heat resistance, no defects were found on the surface of all flooring (crack, blistering, peeling, and gloss loss etc.) after testing. Wet-cold-dry cycle test showed that plywood flooring appeared some cracks. In accelerated weathering test, color difference increased with increasing Xenon arc light irradiation

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Quality Properties of Recycled Coarse Aggregate Manufactured by the Bar-Crusher (봉파쇄기로 제조한 재생 굵은골재의 품질특성)

  • Baek, Dae-Hyun;Han, Dong-Yeob;Yu, Myoung-Youl;Lee, Gun-Cheol;Han, Cheon-Goo
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.11a
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    • pp.509-512
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    • 2006
  • In this study, the quality properties of recycled coarse aggregate, manufactured by the barcrusher, were compared to that of aggregate, manufactured by conservative systems. Test showed that recycled coarse aggregate, manufactured by the bar-crusher, had higher density and shape index, and exhibited lower absorption and abrasion ratios, compared with a con-crusher and an impact-crusher. This is due to the peeling-off effect of mortar, attached on recycled aggregate and the improved round shape of that.

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Post Treatment Application of Jaungo after a Combined Therapy of Carbon Dioxide Laser and Trichloroacetic Acid in a Case of Vulvar Syringoma

  • Kim, En Hyung;Kim, Wonnam
    • Journal of Pharmacopuncture
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    • v.22 no.3
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    • pp.200-203
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    • 2019
  • Syringoma is a benign eccrine sweat gland tumor that predominantly appears in females during puberty with multiple smooth papules measuring 1-2 mm in diameter. Common locations are on lower eyelids and cheeks. Vulvar syringoma is quite a rare, occurring condition with only a few cases reported. Here, we are reporting a case of 31-year-old female with vulvar syringoma associated with pruritus. The lesion was treated with carbon dioxide (CO2) laser ablation and 50% trichloroacetic acid (TCA) chemical peeling. Jaungo was used for wound care after laser abrasion. The combination treatment was effective for removing syringoma lesions. Post laser management with fusidic acid cream and jaungo cream was sufficient to prevent infection and promote wound healing.

Optimal Abrasion Conditions for Separating Aggregate and Cement paste for Using Waste Concrete Fine Powder as Decarbonization Raw Material (폐콘크리트 미분말을 탈탄산 원료로 사용하기 위한 골재와 시멘트페이스트 분리의 최적 마쇄 조건 분석)

  • Ha-Seog Kim;Min-Chul Lee
    • Land and Housing Review
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    • v.14 no.4
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    • pp.121-129
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    • 2023
  • In this study, we attempted to reduce CO2 generated during manufacturing by replacing limestone (CaCO3), a carbonate mineral used to produce cement clinker, with a decarbonated raw material to which CO2 is not bound. The raw material for decarbonization was cement paste attached to waste concrete, among various industrial by-products. Waste concrete has cement paste adhered to the aggregate, which cannot be separated efficiently by general crushing and grinding methods. Peeling and grinding methods effectively remove only the cement paste without damaging the original aggregate. The abrasion time, steel ball type, and steel ball ratio were selected as effective factors for Abrasion. An optimal abrasion experiment was conducted to produce waste concrete fine powder containing decarbonated CaO as a cement clinker raw material through an experimental design method. The experiment revealed that the optimal conditions for producing waste concrete fine powder were an abrasion time of 7 minutes, a steel ball size for pulverization of 8 mm, and a steel ball ratio for pulverization of 0.6.

A Study on the Breakage of the Hatch Spring of the Submarine Escape Trunk through Microstructure Analysis (미세조직 분석을 통한 잠수함 탈출트렁크 해치 스프링 파손에 관한 연구)

  • Lee, Young-Suk;Choi, Woo-Suk;Kim, Byeong-Ho;Yun, Ji-Soo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.22 no.1
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    • pp.305-312
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    • 2021
  • This study examines the damage to the submarine's escape trunk hatch spring through microstructure analysis. The cause of the escape trunk's damage during the submarine's construction and its improvement measures were reviewed. To determine the cause of breakage of the escape trunk spring, samples were taken from the damaged product and analyzed for chemical composition, hardness, and microstructure. In particular, the breakage part of the spring was analyzed in-depth by using a scanning electron microscope to determine the cause of corrosion destruction. Finally, a spring shape design method was proposed through the investigation of the cause of spring breakage. In addition, a newly improved spring was produced by applying a nylon coating with excellent corrosion resistance and abrasion resistance. Applying to an actual submarine trunk hatch revealed that the coating peeling phenomenon due to the contact between the springs is significantly improved when the hatch is opened or closed compared to the existing products.