• Title/Summary/Keyword: peeling ratio

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Correlation between Physicochemical Properties and Peeling Ratio of Korean Chestnut (밤 내피 및 외피의 이화학적 특성 및 박피율과의 상관분석)

  • Hwang, Ja-Young
    • Korean journal of food and cookery science
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    • v.33 no.2
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    • pp.190-197
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    • 2017
  • Purpose: The purpose of this paper was to analyze the physicochemical properties related to peeling rate of Korean chestnut. Methods: Analyses were carried out for weight, thickness, polyphenol, amino acid and peeling ratio for Korean chestnut. The correlation between these physicochemical components and peeling ratio of chestnut was measured. Results: The average of thickness for inner shell and outer shell was 0.66 mm and 0.93 mm, respectively. The average peeling ratio was 77.51%. A significant negative correlation was found between peeling ratio and thickness of the inner shell ($r=-0.80^{***}$, p<0.001). Analysis for the polyphenol composition of inner shell by HPLC was carried out and peaks 2 ($r=-0.56^*$, p<0.05), 11 ($r=-0.68^{**}$, p<0.01), 14 ($r=-0.52^*$, p<0.05), 28 ($r=-0.66^{**}$, p<0.01) showed a significant negative correlation with the peeling ratio. Conclusion: Thickness of chestnut inner shell was determined as the most influential factors of peeling.

Study on Optimization of Flame Peeling System for Chestnut(I) - Development of Simulation Model for Flame Peeling Characteristics - (밤의 화염박피 시스템 최적화에 관한 연구(I) - 국내산 밤의 화염박피 특성 예측모델 개발 -)

  • 김종훈;박재복;최창현;권기현
    • Journal of Biosystems Engineering
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    • v.29 no.1
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    • pp.45-52
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    • 2004
  • The chestnut is a well-blown and important forest product in Korea. The annual production of chestnut is about 95,000 tons and its cultivating area is 80,000 ha. However, the peeling process of outer and inner skins of chestnut is very difficult due to hardness and adhesiveness of chestnut skin. The purpose of this study was to develop a prediction model for flame peeling characteristics of domestic chestnuts, and to evaluate an optimization model to determine the operation conditions of the chestnut flame peeling system. The results of this study were summarized as follows. It was found that the flame peeling characteristics of domestic chestnuts were by the flame temperature, and the flame time. The peeling ratio and the heating depth were increased as the flame temperature and the flame time were increased. The peeling ratio and the heating depth were increased linearly when those were less than 85 % and 2 mm respectively. As the hardness of chestnut shell was decreased, the peeling ratio was increased. A simulation model was developed to predict the peeling ratio and the heating depth based on the hardness of the chestnut shell, the flame temperature, and the flame time of the peeling system. The model was evaluated by comparing the measurement and the prediction of the peeling ratios and heating depths, and showed the good relationship.

Effects of Flame Peeling Characteristics on the Hardness of the Chestnut Shells (밤 외피 경도가 화염박피 특성에 미치는 영향)

  • 김종훈;박재복;최창현;김재민
    • Journal of Biosystems Engineering
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    • v.23 no.4
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    • pp.351-358
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    • 1998
  • It was intended to investigate that how hardness of chestnut shell affects the flame peeling characteristics of Korean Chestnut. Effects of the hardness on the flame peeling characteristics need to be found to establish the optimum drying conditions for chestnut of various cultivars, sizes and harvested years. The equation based on the hardness of the chestnut shells was developed. It was found that the flame peeling characteristics of the corresponding to the various drying conditions did not differ significantly to the groups with the same hardness. The flame peeling characteristics of the chestnut with the same hardness were not influenced by cultivars, size, and harvested year, The peeling ratio and the heating depth were increased by decrease of the hardness of the chestnut shells. On the other hand, the peeling ratio and the heating depth were increased as the flame temperature was increased with the same hardness. When the heating depth was limited to 2.1 mm regarding the process characteristics and the damage ratio, the proper hardness and peeling ratio of chestnut shells were 1,369.8 g/$\textrm{mm}^2$ and 83.9%, respectively, at the flame temperature of $700^{\circ}C$. And also 1,517.7 g/$\textrm{mm}^2$ and 80.7% at 75$0^{\circ}C$.

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Study on Optimization of Flame Peeling System for Chestnut (II) - Optimization of Flame Peeling Process for Chestnut - (밤의 화염박피 시스템 최적화에 관한 연구(II) - 화염박피 공정의 최적화 -)

  • 김종훈;박재복;최창현;이충호
    • Journal of Biosystems Engineering
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    • v.29 no.1
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    • pp.53-58
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    • 2004
  • The purpose of this study was to evaluate an optimization model to determine the operation conditions of the chestnuts flame peeling system. The results of this study were summarized as follows. The optimization model was developed and evaluated to represent the flame peeling characteristics of the domestic chestnuts. When the heating depth was selected for various utilization of the peeled chestnuts, the model could determine the optimal conditions of the hardness of the chestnut shells, the flame temperature, and the flame time to get the maximum peeling ratio of the chestnut flame peeling system. When the heating depth was limited to 2.2 mm, the optimization model determined the proper operation conditions and the maximum peeling ratio such as 1594 g/$\textrm{mm}^2$ of the hardness of the chestnut shells, 780$^{\circ}C$ of the flame temperature, 29 second of the flame time, and 98.1 % of the peeling ratio.

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.

Analysis of Performance of an Air-Type Garlic Peeler for its Optimum Design (공기식 마늘 박피기의 적정 설계를 위한 요인별 영향 분석)

  • Cho, Y.J.;Kim, C.J.
    • Journal of Biosystems Engineering
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    • v.18 no.4
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    • pp.351-357
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    • 1993
  • Recently, a garlic peeler with high performance is being demanded due to increase of consumption of peeled garlic. Although the air type out of various types of garlic peelers is recommended to remove effectively skin of garlic, it has an important problem of large energy consumption. This study was performed to analyze performance of an air-type garlic peeler for its optimum design. Performance indices to represent performance of garlic peeler include peeling ratio, energy efficiency and peeling performance. The factors such as aperture of nozzle, angle and position of air injection, charge rate of garlic, peeling time and so on must be considered to design optimally an air-type garlic peeler.

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Bonding evolution of bimetallic Al/Cu laminates fabricated by asymmetric roll bonding

  • Vini, Mohamad Heydari;Daneshmand, Saeed
    • Advances in materials Research
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    • v.8 no.1
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    • pp.1-10
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    • 2019
  • Roll bonding (RB) process of bi-metal laminates as a new noble method of bonding has been widely used in the production of bimetal laminates. In the present study, asymmetric roll bonding process as a new noble method has been presented to produce Al/Cu bimetallic laminates with the thickness reduction ratios 10%, 20% and 30% together with mismatch rolling diameter ($\frac{R_2}{R_1}$) ratio 1:1, 1:1.1 and 1:1.2. ABAQUS as a finite element simulation software was used to model the deformation of samples. The main attention in this study focuses on the bonding properties of Al/Cu samples. The effect of the $\frac{R_2}{R_1}$ ratios was investigated to improve the bond strength. During the simulation, for samples produced with $\frac{R_2}{R_1}=1:1.2$, the vertical plastic strain of samples was reach the maximum value with a high quality bond. Moreover, the peeling surface of samples after the peeling test was investigated by the scanning electron microscopy (SEM).

Development of An Onion Peeler ( II ) - Air injection type peeling equipment - (양파 박피기 개발 (II) - 공기분사식 박피장치 -)

  • 민영봉;김성태;강동현;최선웅;유준현
    • Journal of Biosystems Engineering
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    • v.27 no.4
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    • pp.311-316
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    • 2002
  • This study was carried out to investigate the optimum operating conditions of the air injection type onion peeling device which could be attached to a prototype onion peeler. An onion, stem and root was cut and some vertical line was dug in 1 mm depth on the skin, was put on the two parallel rollers. The diameters of the rollers were 105 mm and the ratio of peripheral velocity was 3:2, and moved by a geared motor. Air from the nozzle with high pressure and velocity was jetted to the rotating onion on the revolving rollers, and then the skin of the onion was stripped. On the test, the rolling characteristics of the experimental materials were measured. The effective peeling conditions were, the number of digging line on the skin of the onion was 4, and the air jet pressure was above 392.3 kPa(4.0 kg/$\textrm{cm}^2$) when the peripheral velocity was at 2.4 m/s. On these conditions, time requirement to peel an onion was less than 2 sec.

A Comparative Study on the Quality of Recycled Aggregate for Concrete by Grinding and Peeling and Milling (파·분쇄기와 박리 및 마쇄기 접목에 따른 콘크리트용 순환골재의 품질 비교 연구)

  • Choi, Won-Young;Jeon, Chan-Soo;Kim, Ji-Hoon
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2018.05a
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    • pp.261-262
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    • 2018
  • In this study, the quality of recycled aggregate for concrete was investigated as the number of recycled aggregate crushing cycles, grinder and crusher, peeling and crushing. First, the quality of density, absorption ratio and solid content was improved as the separation distance decreased and the number of crushing increased, depending on the number of crushing of recycled aggregate and the distance between mantle and cone cave. The quality of density, absorption ratio and solid content was improved as the wire mesh used in striking plate and the number of hammers increased, depending on the type of striking plate and the number of hammers.

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Characteristics of Change in Properties of Self-Adhesive Butyl Rubber Waterproofing Sheet by Increasing the Amount of Reclaimed Rubber (자착식 부틸고무 방수시트의 재생고무 증량 배합에 따른 물성변화 특성)

  • Choi, Su-Young;Park, Jin-Sang;Choi, Sung-Min;Kwon, Young-Hwa;Kim, Young-Keun;Oh, Sang-Keun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2021.11a
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    • pp.252-253
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    • 2021
  • In this study, butyl rubber, which is the main material constituting the self-adhesive butyl rubber waterproofing sheet, was mixed with reclaimed rubber, and tensile strength, tear strength, peeling resistance strength, and adhesion strength were measured for sample prepared by mixing ratio. As a result, it was confirmed that peeling resistance strength and adhesion strength decreased as the reclaimed rubber content increased, and tensile strength and tear strength did not change significantly.

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