• Title/Summary/Keyword: physical properties

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Effects of Processing Parameters on the Physical Properties of Spunbounded and Melt Blown Nonwovens (스펀본드와 멜트블로운 부직포의 물리적 성질)

  • 서학은;김은애
    • Textile Science and Engineering
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    • v.36 no.7
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    • pp.529-538
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    • 1999
  • The processing parameters of spunbonding and melt blowing technologies are major factors determining the physical properties of the resulted nonwovens. In this study, the effects of basis weight and calendering temperature on the physical properties of spunbonded nonwovens were examined. Twelve spunbonded polypropylene nonwovens were fabricated from three different calendering temperatures and four different basis weights. To evaluate the effects of basis weight on the physical properties of melt blown nonwovens, four polypropylene nonwovens having different basis weights were produced. A statistical model fitting by regression was employed to estimate the physical properties. Four physical properties of the spunbonded webs were simultaneously optimized to estimate the optimum calendering temperature and basis weight values for a strong, extensible, breathable and flexible nonwoven. Also, the linear relationships among the properties were examined by Pearson coefficients. The results indicated that the physical properties of the nonwovens were greatly influenced by the calendering temperatures and basis weights. The ratios of the strengths in machine direction and in cross direction were greatly influenced by the basis weights. This study suggested one way to optimize the processing parameters for the interpretation and prediction of the properties of nonwoven fabrics.

The Studies of Correlation between Wrinkle and Mechanical Properties of Fabric (직물의 구김과 역학적성질과의 상관성 연구)

  • 김승진;장동호
    • Textile Science and Engineering
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    • v.20 no.1
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    • pp.11-18
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    • 1983
  • To determine the degrees of the contribution of the various physical properties of the fabrics to their crease recovery, correlations between the 16 physical properties and crease recovery were experimentally analyzed on the 165 worsted sample fabrics by the KES-F System and the Monsanto crease recovery tester. Step-Wise Regression and Correlation Analyses were used to examine correlations between crease recovery and these physical properties. The regression formula was derived to estimate crease recovery from the given physical properties. Correlation coefficients between the estimates obtained by the formula and the experimental results were calculated. And the degrees of the contribution of the 16 physical properties to crease recovery were classified.

Physical properties of composite resins for dental restorative (치과 수복재용 복합레진의 물리적 특성에 대한 연구)

  • Kim, Ji Yeob;Lee, Kwang-Rae
    • Journal of Industrial Technology
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    • v.35
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    • pp.35-39
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    • 2015
  • One of the purposes of the study was to investigate and compare the physical properties(depth of light cure, degree of conversion, water absorption) of 4 kinds of composit resins prepared in this lab; Bis-GMA based, Bis-EMA based, Bis-GMA/UDMA based, and Bis-EMA/UDMA based composit. Another aim was to compare the physical properties of the composit resins with those of the commercialized products(Charmfil flow(Denkist), Quadrant flow(CAVEX)) in market. All of the composit resins and the commercialized products showed almost same values of the physical properties. It was found that all of the composit resins prepared in this lab satisfied the physical properties specified in ISO 4049.

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Force-Deformation Characteristics of the Fruit Flesh (과실(果實)의 힘-변형(變形) 특성(特性))

  • Kim, M.S.;Park, J.M.;Choi, D.S.
    • Journal of Biosystems Engineering
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    • v.17 no.2
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    • pp.156-170
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    • 1992
  • The force-deformation relationship gives the basic physical properties of the fruits such as the bioyield point, the rupture point, and the deformations at the bioyield point and the rupture point. These informations are very important to study the stress-strain relationships of the fruits. This study was conducted to analyze those physical properties according to the sampling position of the fruits, and to determine the bioyield point, the rupture point, and the deformations at the bioyield point and the rupture point of the fruits for two different storage conditions(low temperature and normal temperature) and the storage period, and to investigate the effect of loading rate on those physical properties, the hysteresis on the loading-unloading condition and the degree of elasticity of the fruits. The results of the study were as follows : 1. The physical properties(BS, US, BD, and RD) of the test specimen selected from the different sampling positions were quite different. The values of the physical properties were shown smallest ones at the cheek of the fruits, and the statistical test results of the physical properties between the cheek from the other two positions of the fruits showed that there were significant difference at the 1 % level between them. 2. The effect of loading rate on the physical properties of the fruits was relatively large, all the considered physical propertis of the fruits increased with the loading rate, but the hysteresis loss decreased with it. 3. The physical properties of the fruits according to the storage conditions and period showed different, and the bioyield deformation and the rupture deformation of the fruits increased with the storage period, but the bioyield strength and the ultimate strength of the fruits decreased with it. The effect of the storage conditions on the those physical properties showed that the normal temperature storage condition was a little higher than the low temperature storage condition. 4. As a whole, it was shown that the bioyield strength and the ultimate strength of the pear decreased a little faster than those of the apple, and the bioyield deformation and rupture deformation of the pear increased a little faster than those of apple at the two storage conditions.

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Group Contribution Method and Support Vector Regression based Model for Predicting Physical Properties of Aromatic Compounds (Group Contribution Method 및 Support Vector Regression 기반 모델을 이용한 방향족 화합물 물성치 예측에 관한 연구)

  • Kang, Ha Yeong;Oh, Chang Bo;Won, Yong Sun;Liu, J. Jay;Lee, Chang Jun
    • Journal of the Korean Society of Safety
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    • v.36 no.1
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    • pp.1-8
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    • 2021
  • To simulate a process model in the field of chemical engineering, it is very important to identify the physical properties of novel materials as well as existing materials. However, it is difficult to measure the physical properties throughout a set of experiments due to the potential risk and cost. To address this, this study aims to develop a property prediction model based on the group contribution method for aromatic chemical compounds including benzene rings. The benzene rings of aromatic materials have a significant impact on their physical properties. To establish the prediction model, 42 important functional groups that determine the physical properties are considered, and the total numbers of functional groups on 147 aromatic chemical compounds are counted to prepare a dataset. Support vector regression is employed to prepare a prediction model to handle sparse and high-dimensional data. To verify the efficacy of this study, the results of this study are compared with those of previous studies. Despite the different datasets in the previous studies, the comparison indicated the enhanced performance in this study. Moreover, there are few reports on predicting the physical properties of aromatic compounds. This study can provide an effective method to estimate the physical properties of unknown chemical compounds and contribute toward reducing the experimental efforts for measuring physical properties.

Predicting the Impact of Food Processing on the Physical Properties of Food

  • Zuo, Li;Lee, Jun-Ho
    • Preventive Nutrition and Food Science
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    • v.8 no.4
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    • pp.419-424
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    • 2003
  • The physical properties of food playa significant role in the modeling and computation of the heat and mass transfers in basic food processing operations. With the advent of improved analytical techniques, statistical experiment design applications, computing ability and knowledge of the food physical properties of food, there have been significant advances in our ability to predict the impact of processing on the physical properties of food. This article briefly reviews our current ability to predict the influence of processing on the physical properties of food, such as water activity, moisture, color, and rheological characteristics.

Effect of Refining on the Stress-Strain Characteristics and Physical Properties of Paper (고해가 종이의 응력-변형 특성 및 물성에 미치는 영향)

  • Won, Jong-Myoung
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.38 no.4
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    • pp.10-16
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    • 2006
  • The study was carried out to investigate how the refining of pulps affects the stress-strain characteristics and physical properties of paper. SwBKP and HwBKP were refined with Hollender laboratory beater to obtain three levels of freeness(500, 400 and 300 ml CSF) at the different consistencies(0.5% and 1.0%). The effects of fines were also evaluated. The stresses and strains of papers made from SwBKP and HwBKP were increased with refining. The absolute value of strain in paper made from SwBKP was higher than those of paper made from HwBKP. We also found that the presence of fines increased the stress and strain significantly in both pulp types. The refining at lower pulp consistency gave higher stress and strain properties. Most physical properties of paper were improved with refining, but the effect of refining consistency depended on the characteristics of each physical properties.

The Study on the Change of Physical Properties of Acrylic Fibers by Setting (아크릴 Fiber의 열적성질에 대하여)

  • 이진우;주우열
    • Textile Science and Engineering
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    • v.16 no.3
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    • pp.40-48
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    • 1979
  • The investigation was carried out to study the effect of wet heat setting and subsequent dry heat setting on the physical properties of regular acrylic fiber (Fw type) and conjugate acrylic fiber (Gw type). The physical properties of fiber such as tenacity, elongation, and dyeability are found to be affected in proportion to the increased degree of shrinkage at temperat ure below 13$0^{\circ}C$ by wet heat setting. Yellowing is observed at the same degree on the dry heat treated Fw and Gw type. But there is a significant difference in the degree of yellowing of two types of acrylic fibers setted by dry heat at the temperature above 18$0^{\circ}C$. The change is physical properties of Gw type is greater than of Fw type on alkaline solution treatment. The change of physical properties by boiling water treatment is more profound with Gw type than Fw type. The stress relaxation of Gw and Fw type is significantly affected by increasing the temperature of heat treatment.

Optimum Condition on Overlap of Physical Properties of HIPS Samples

  • Son, Jung-Mo
    • Bulletin of the Korean Chemical Society
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    • v.12 no.1
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    • pp.52-57
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    • 1991
  • To find optimum conditions necessary in converting physical properties of any resin into those of others, eleven kinds of HIPS (High-Impact Polystyrene) resins were prepared. First physical properties of eleven samples divided into three groups are analyzed by a torque rheometer (named Plasti-Corder, Model No.: PLD 651) and GPC (Gel Permeation Chromatography), and then optimum conditions on conversion among samples are obtained by calculation from computer simulation so that any sample subjected to each group can show physical properties of other samples in its group. Even though the kind of plasticizer of any sample is different with others in its group, once optimum conditions on conversion among samples are met, it is found that physical properties of any sample are identical or similar to those of others in each group.

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Effect of Drafting Conditions on the Physical properties noving (III) (드래프트 조건이 조사의 물리적 성질에 미치는 영향 (III))

  • Park, Chang-Hyeok;No, Jeong-Ik;Kim, Su-Bong
    • Textile Science and Engineering
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    • v.28 no.4
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    • pp.42-51
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    • 1991
  • In order to investigate the linear and quadratic effects of drafting conditions i.e., twist, draft ratio, and roller gauge on the physical properties of several roving i.e., drafting force, tensile strength, elongation, and evenness, statistical methods such as 33 factorial design and multiple linear regression analysis have been used. The draft ratio was the main factor influencing the physical properties of roving. All the drafting conditions influenced the physical properties in a linear manner for all the specimens, but in a quadratic manner, showed partially different results and a carded roving was less significant than other combed roving. Among the physical properties, the elongation was not influenced by the drafting conditions in two-factor interaction. In the multiple linear regression analysis, the twist gave a negative effect on the evenness, but positive on others. The draft ratio and roller gauge gave a positive effect on the evenness, but negative on others.