• Title/Summary/Keyword: Peeling Rate

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Development of Chestnut Peeling System (밤 박피 시스템 개발)

  • 김종훈;박재복;최창현
    • Journal of Biosystems Engineering
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    • v.22 no.3
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    • pp.289-294
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    • 1997
  • The chestnut is a well-known and important forest product in Korea. The annual production of chestnut is about 100, 000tons and its cultivating area is 80, 000ha. However, the peeling process of outer and inner skins of chestnut is very difficult due to hardness and adhesiveness of chestnut skin. The peeling process of chestnut was operated by manual work and the performance of chestnut peeling machine is very low. The purpose of this study is to develope the prototype of new chestnut peeling system. The hardness of chestnuts was tested with six different drying conditions and its range was from 949$g/mm^2$ to 2, 149$g/mm^2$. The hardness of chestnuts was decresed gradually during the drying process. The chestnut peeling Process includes sorting, storage, drying, outer skin cutting, flame peeling, continuous frictional skin peeling, and inner skin cutting operation. The developed chestnut peeling system consists of outer skin cutter, flame peeler, continuous frictional skin peeler and inner skin cutter. The system can peel domestic chestnuts at 150$kg/hr$ with peeling rate of 78%.

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Development of machine learning prediction model for weight loss rate of chestnut (Castanea crenata) according to knife peeling process (밤의 칼날식 박피공정에 따른 머신 러닝 기반 중량감모율 예측 모델 개발)

  • Tae Hyong Kim;Ah-Na Kim;Ki Hyun Kwon
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.17 no.4
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    • pp.236-244
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    • 2024
  • A representative problem in domestic chestnut industry is the high loss of flesh due to excessive knife peeling in order to increase the peeling rate, resulting in a decrease in production efficiency. In this study, a prediction model for weight loss rate of chestnut by stage of knife peeling process was developed as undergarment study to optimize conditions of the machine. 51 control conditions of the two-stage blade peeler used in the experiment were derived and repeated three times to obtain a total of 153 data. Machine learning(ML) models including artificial neural network (ANN) and random forest (RF) were implemented to predict the weight loss rate by chestnut peel stage (after 1st peeling, 2nd peeling, and after final discharge). The performance of the models were evaluated by calculating the values of coefficient of determination (R), normalized root mean square error (nRMSE), and mean absolute error (MAE). After all peeling stages, RF model have better prediction accuracy with higher R values and low prediction error with lower nRMSE and MAE values, compared to ANN model. The final selected RF prediction model showed excellent performance with insignificant error between the experimental and predicted values. As a result, the proposed model can be useful to set optimum condition of knife peeling for the purpose of minimizing the weight loss of domestic chestnut flesh with maximizing peeling rate.

Development of a Garlic Peeling System Using High-Pressure Water Jets (I) - Peeling tests with high-pressure plunger pumps and flat-spray nozzles - (습식 마늘박피 시스템 개발 (I) - 고압 플런저 펌프와 부채꼴 분사노즐을 이용한 박피 실험 -)

  • 양규원;배영환;백성기
    • Journal of Biosystems Engineering
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    • v.29 no.3
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    • pp.217-224
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    • 2004
  • This research was conducted to test the feasibility of utilizing high-pressure water jets of over 1.0㎫ as a means of breaking and peeling garlic bulbs. High-pressure plunger pumps and flat-spray nozzles of varying orifice diameters and spray angles were utilized to supply water jets into a prototype peeling chamber made of transparent acrylic plates. Water jets were discharged from a total of six nozzles installed in such a way that three parallel nozzles face the other three. The cross-sectional area of the peeling chamber and the installation angle of the nozzles had critical effects on peeling performance. Small cross-sectional area was required so that total impact force of water jets on garlic could be increased. The optimum installation angles were around 4, 8, and 16$^{\circ}$ for the nozzles having 15, 40, and 65$^{\circ}$ spray angles, respectively. Best performance with 61.4% of completely-peeled garlics was obtained at a pressure of 1.94㎫ and a flow rate of 9.07 $\ell$/min for each nozzle. The peeling efficiency of the system was generally unsatisfactory due to the limited flow rate of the plunger pumps utilized. For better performance, it is recommended to increase flow rate while reducing operating pressure by utilizing other type of pumps.

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.

Effect of Peeling Blades and Abrasives on Mechanical Peeling of Cynanchum wilfordii Hemsley (박피(剝皮)날 및 연마재(硏磨材)가 백하수오(白何首烏) 기계박피(機械剝皮)에 미치는 영향(影響))

  • Kim Ju;Kim Chang-Soo;Song Yeung-Eun;Lee Yun-Suk;Shim Jin-Chan;Han Jong-Hyun;Kwak Joon-Soo
    • Korean Journal of Acupuncture
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    • v.18 no.1
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    • pp.165-170
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    • 2001
  • A rapid increasing in cultivation area due to favorable price temporarily and decreasing in consumer's demands caused by economic depressions recently, lead the price of Cynanchum wilfordii Hemsley to decline sharply. Thus, it may give rises to weakening of cultivation bases in Cynanchum wilfordii Hemsley. To investigate optimal mechanical peeling conditions of Cynanchum wilfordii Hemsley, protruded rubber, plastic pad, diamond shape's steel and palstic brush were introduced as blades and artificial stone, sand and small pebble were done as abrasives. The main results obtained were summarized as follows; 1. It took 2 minutes per 1kg in mechanical peeling of Cynanchum wilfordii Hemsley's raw root whereas 36 minutes in manual peeling and values of lightness showed more higher in manual peeling than in mechanical peeling. 2. Yield in combination of diamond shape's steel blade and sand abrasive showed the lowest at 89.9% among treatments and peeling rates in combination of diamond shape's steel blade and small pebble showed the highest at 71.3% in mechanical peeling. 3. Lightness, one of the most important factors in determining quality of Cynanchum wilfordii Hemsley, showed the highest in combination of diamond shape's steel blade and small pebble brasive at 61.90 in mechanical peeling. 4. As the speed of rotation gets faster, yields tend to lower in mechanical peeling. Peeling rates and lightness showed the highest at 66.8%, 57.96 respectively among treatments at 30 r.p.m. in mechanical peeling.

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A Study on Solving the WSix Peeling Issue at MDDR DRAM (MDDR(Mobile Double Data Rate) DRAM의 WSix Peeling 불량 해결 연구)

  • Chae, Han-Yong;Lee, Sung-Young;Park, Tae-Hoon;Lee, Hyun-Sung;Lee, Kwang-Hee;Seo, Ju-Won;Choi, Kyue-Sang
    • Proceedings of the IEEK Conference
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    • 2008.06a
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    • pp.481-482
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    • 2008
  • In this paper, the advanced process has been presented to remove the WSix peeling that was made in sub 100nm DRAM SRCAT(Sphere-shaped-Recess-Ch annel-Array Transistor). The source of WSix peeling was proved to be the groove of gate poly film. We have completely solved the problems to adopt the gate-poly CMP (Chemical Mechanical Polishing) process.

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Reduction of Free Edge Peeling Stress in Composite Laminates under Bending Load (굽힘하중이 가해지는 복합재 평판 자유단에서의 박리응력 감소 연구)

  • Jung, Seok-Joo;Sung, Myung-Kyun;Kim, Heung Soo
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.28 no.5
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    • pp.497-502
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    • 2015
  • In this paper, a stress function-based approach was proposed to analyze the reduction of free-edge peeling stress in smart composite laminates using piezoelectric actuator under bending load. Electro-mechanically coupled governing equation was obtained by complimentary virtual work principle. The stress state was solved by the generalized eigenvalue procedure. The free-edge peeling stress of smart composite laminates was reduced by the piezoelectric actuation. The reduction rate of peeling stress in cross-ply composite laminate is larger than that in angle ply composite laminate.

Key Parameter of Peel-off Test for Reliability Assessment of Toner Film (토너 박막의 신뢰성 평가를 위한 Peel-off Test의 주요인자)

  • Kim, Kwang-Il;Kim, Dae-Eun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.34 no.11
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    • pp.1567-1573
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    • 2010
  • In printing systems, the reliability of printed material depends on the ability of the toner film to remain adhered to the paper surface. In order to measure the strength between the toner film and the paper surface, a peel-off test is often performed. After conducting the test, the amount of toner film remaining on the paper is measured in order to determine the interfacial strength. The results of this test can be affected by many factors such as the peeling rate, weight of the roller used, and dwell time of tape. Sensitivity analysis was performed with respect to peeling rate, weight of roller and dwell time of tape at different levels. It was found that the interfacial strength increased with an increase in these main parameters. On the other hand, the trend with respect to the percentage of toner loss was different. Further, the interfacial strength and percentage of toner loss were significantly affected by the peeling rate.

Effects of Film Stack Structure and Peeling Rate on the Peel Strength of Screen-printed Ag/Polyimide (박막 적층 구조 및 필링 속도가 스크린 프린팅 Ag/Polyimide 사이의 필 강도에 미치는 영향)

  • Lee, Hyeonchul;Bae, Byeong-Hyun;Son, Kirak;Kim, Gahui;Park, Young-Bae
    • Journal of the Microelectronics and Packaging Society
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    • v.29 no.2
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    • pp.59-64
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    • 2022
  • Effects of film stack structure and peeling rate on the peel strength of screen-printed (SP) Ag/polyimide (PI) systems were investigated by a 90° peel test. When PI film was peeled at PI/SP-Ag and PI/SP-Ag/electroplated (EP) Cu structures, the peel strength was nearly constant regardless of the peeling rate. When EP Cu was peeled at EP Cu/SP-Ag/PI structure, the peel strength continuously increased as peeling rate increased. Considering uniaxial tensile test results of EP Cu/SP-Ag film with respect to loading rate, the increase of 90° plastic bending energy and peel strength was attributed to increased flow stress and toughness. On the other hand, viscoelastic PI film showed little variation of flow stress and toughness with respect to loading rate, which was assumed to result in nearly constant 90° plastic bending energy and peel strength.

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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