• Title, Summary, Keyword: Fibre

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A Discussion of Komori s Theory on the Number of Fibre-to-Fibre Contact Points in the Fibre Assembly (고모리의 섬유간 접촉점 수에 관한 이론의 고찰)

  • 이대훈;이재곤
    • Textile Science and Engineering
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    • v.22 no.6
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    • pp.16-20
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    • 1985
  • Komori's theory on the number of fibre-to-fibre contact points in the fibre assembly is discussed in this paper using a model the contact points were directly observable and countable. The number of observed contact points in the model was twice the number or that estimated by komori's formula. The space where the center of mass of the fibre can occupy is reduced by one half in the model. Komori's theory, however, might be applicable to the fibre assembly where the fibre center can travel freely through the entire space.

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NUTRITIVE EVALUATION OF SAGO FIBRE

  • Yadav, D.P.;Mahyuddin, M.
    • Asian-Australasian Journal of Animal Sciences
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    • v.4 no.2
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    • pp.177-182
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    • 1991
  • Nutrient evaluation of sago fibre showed that the fibre has potential and could be utilized as feed for ruminants. However, as a source of nutrients, it has limitations arising from low intake, digestibility, crude protein and minerals content. The present study showed that the sago fibre is low in crude protein (3.3%) and high in neutral detergent fibre (72.5%) and acid detergent lignin (25.8%) contents. Treatment of sago fibre with urea increased the crude protein content from 3.3 to 16.7%. Both urea and sodium hydroxide treatment decreased the neutral detergent fibre level from 72.5 to 59 and 56.5%, respectively. Rumen degradation of sago fibre by nylon bag showed that both urea and sodium hydroxide treatments increased dry matter and organic matter disappearance of the fibre significantly. In vivo digestibility of 2% urea treated sago fibre was 47.5% and intake of the fibre was 1.57% of body weight of the lamb.

Experimental and microstructural evaluation on mechanical properties of sisal fibre reinforced bio-composites

  • Kumar, B. Ravi;Hariharan, S.S.
    • Steel and Composite Structures
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    • v.33 no.2
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    • pp.299-306
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    • 2019
  • The natural fibre composites are termed as bio-composites. They have shown a promising replacement to the current carbon/glass fibre reinforced composites as environmental friendly materials in specific applications. Natural fibre reinforced composites are potential materials for various engineering applications in automobile, railways, building and Aerospace industry. The natural fibre selected to fabricate the composite material is plant-based fibre e.g., sisal fibre. Sisal fibre is a suitable reinforcement for use in composites on account of its low density, high specific strength, and high hardness. Epoxy is a thermosetting polymer which is used as a resin in natural fibre reinforced composites. Hand lay-up technique was used to fabricate the composites by reinforcing sisal fibres into the epoxy matrix. Composites were prepared with the unidirectional alignment of sisal fibres. Test specimens with different fibre orientations were prepared. The fabricated composites were tested for mechanical properties. Impact test, tensile test, flexural test, hardness test, compression test, and thermal test of composites had been conducted to assess its suitability in industrial applications. Scanning electron microscopy (SEM) test revealed the microstructural information of the fractured surface of composites.

An Investigation of Spinning and Knitting Performance of Domestic Angora rabbit hair (앙골라 토모의 방적 및 편직성에 관한 연구)

  • 장석윤;최영엽
    • Textile Science and Engineering
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    • v.7 no.2
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    • pp.25-38
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    • 1970
  • This investigation aimed at improving the quality of domestic Angora fur fibre, when it is spun together wool and synthetic fibre, by solving the difficulties in processing and it was also aimed at finding the methods of preventing the fault of fibre-slipping off from knitted goods. This investigations was classified into two main parts, one of them was fundamental study and another was spinning and knitting performance. In the former the physical and chemical properties was investigated, in the latter the spinning and knitting performances was investigated taking use of the results of fundamental study. The processing aspects was, in the study of spinning and knitting performance, compared with the quality of trial-products which was made during the investigation and the method of preventing fibre-slipping off was also studied. Summary of results were as follows; 1) Topology of Angora fur fibre \circled1 Generally Angora fur fibre was classified into three appearances, finer fur fibre, hetero type hair and guard hair. \circled2 Angora fur fibre, regardless of its appearances, was composed of ladder type medulla forming a hollow cylinder and covered with cortex. \circled3 A few crimps was founded in Angora fur fibre except finer fur fibre. \circled4 Though the scale on the Angora fur fibre was founded, it was exceedingly by smaller than that of woo. 2) Physical properties \circled1 Because of characteristics in appearances of Angora fur fibre the strength-elongation behaviour was considerably scattered and load-elongation behaviour of finer fur fibre was less than that of wool. \circled2 The static charging rate of Angora fur fibre was similar to that of wool but discharging rate was quicker than that of wool. \circled3 The staple length of domestic Angora fur fibre was considerably scattered. 3) Chemical properties \circled1 The chemical component of Angora fur fibre was similar to that of wool. \circled2 Rate of curl was increased by the treatment of carroting but the load-elongation behaviour became 4) Spinning and knitting performance \circled1 Smaller amount of water was recommanded when oiling the Angora fur fibre than oiling the wool. \circled2 The processing characteristics of Angora fur fibre was similar to that of wool which has fine denier and long staple. \circled3 Knitting officiency could be increased by the use of additional filament yarn. 5) Fibre-slipping off from the knitted goods \circled1 The mechanism of fibre-slipping off was classified into two parts, fibre-slipping off by statics and frictional pulling. \circled2 a) The prevention of fibre-slipping off was capable by increasing of twists, turns Per unit length of yarn and using of long staple. b) The use of core yarn was effected on the decrease of fibre-slipping off.

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Studies on the Aging of Bovine Muscle at Adding the Proteolytic Enzyme -VII. Studies on the Histological Observation of Bovine Muscle Treated with Papain- (단백질(蛋白質) 분해효소(分解酵素) 첨가시(添加時) 우육(牛肉)의 숙성(夙成)에 관(關)한 연구(硏究) -VII. Papain 처리(處理) 우육(牛肉)의 조직학적(組織學的) 고찰(考察)-)

  • Yoon, Jung-Eui
    • Korean Journal of Food Science and Technology
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    • v.9 no.4
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    • pp.271-276
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    • 1977
  • Treating with step concentration of papain, round mucle of Korean cattle were cut in longitudinal and cross section and stained. Collagenous fibre and elastic fibre of its connective tissue were observed microscopically. The results were as follows: 1) In proportion to the increase of enzyme concentration amorphous bundle of collagenous fibre were loosed gradually and destroyed in the long run and besides the property of this fibre stained became remarkably weak. 2) Elastic fibre was paralleled to muscle fibre and in proportion to the increase of enzyme concentration, it was lost elasticity, loosed, straightened and broken remarkably to pieces. 3) Histological variation of collagenous fibre and elastic fibre treated with enzyme was more remarkable than control.

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Fleece Phenotype Influences Susceptibility to Cortisol-induced Follicle Shutdown in Merino Sheep

  • Ansari-Renani, H.R.;Hynd, P.I.;Aghajanzadeh, A.
    • Asian-Australasian Journal of Animal Sciences
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    • v.20 no.11
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    • pp.1761-1769
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    • 2007
  • This experiment was conducted to determine the extent to which susceptibility to cortisol-induced follicle shutdown is influenced by fleece phentotype. Twenty Finewool (10 sheep low fibre diameter, low coefficient of fibre diameter-LL and 10 low fibre diameter, high coefficient of variation of fibre diameter-LH) and twenty Strongwool (10 low fibre diameter, low coefficient of variation of fibre diameter-HL and 10 high fibre diameter and high coefficient of variation of fibre diameter-HH) sheep of 9 months of age were individually penned in an animal house and were injected intramuscularly with an aqueous suspension of hydrocortisone acetate at a rate of 1.42 mg/kg body weight for a period of two weeks. Fibre diameter was measured from clipped tattooed patch wool samples. Follicle activity was measured by histological changes in skin biopsies taken weekly. Blood samples were collected at two-week intervals and plasma cortisol measured. Increased plasma cortisol concentration significantly (p<0.05) reduced clean wool production and mean fibre diameter dropped to its lowest level four weeks after commencement and two weeks after the cessation of cortisol injection. Elevation of plasma cortisol concentration significantly (p<0.0001) increased the percentage of inactive follicles two weeks after injection started. High fibre diameter groups (Strongwool sheep; i.e. HL+HH) had significantly (p<0.0001) higher percentage of follicle shutdown than low fibre diameter groups (Finewool sheep; i.e. LL+LH). Average percentage of shutdown follicles for Finewool (LL+LH) and Strongwool (HL+HH) Merino sheep was $9.8{\pm}0.9$ and $13.5{\pm}0.9$ respectively. Shutdown of primary follicles was more pronounced in Finewool than Strongwool sheep. There was no significant effect of coefficient of variation of fibre diameter on propensity to follicle shutdown induced by exogenous cortisol. It is concluded that elevation in plasma cortisol concentration is inhibitory to the normal activity of follicles in Strongwool sheep but that variation in fibre diameter has little or no effect.

Dietary Fibre and the Risk of Colorectal Cancer: a Case-Control Study

  • Song, Y;Liu, M;Yang, FG;Cui, LH;Lu, XY;Chen, C
    • Asian Pacific Journal of Cancer Prevention
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    • v.16 no.9
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    • pp.3747-3752
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    • 2015
  • Background: Colorectal cancer is one of the most commonly occurring cancers in China. Dietary fibre has been thought to decrease the risk of colorectal cancer in Western countries. However, studies investigating the association between dietary fibre (particularly soluble and insoluble fibres) and colorectal cancer have hitherto been lacking in China. Objective: This case-control study examined the effect of dietary fibre intake on the risk of colorectal cancer, stratified by tumour site. Materials and Methods: The study included 265 cases (colon cancer, 105; rectal cancer, 144; colon and rectal cancer, 16) and 252 controls residing in Qingdao. A food frequency questionnaire that included 121 food items was used to collect dietary information. Odds ratio (OR) and 95% confidence intervals (CI) were calculated using unconditional logistic regression analysis. Results: For food groups, controls in the study consumed more vegetables, soy food and total fibre than did colorectal cancer patients (p<0.05). The intakes of fruit, meat and sea-food did not differ significantly between cases and controls. However, we did not find any association between soy food intake and colon cancer. We observed inverse associations between total fibre intake and colorectal, colon and rectal cancer (Q4 vs Q1: OR=0.44, 95%CI, 0.27-0.73; OR=0.40, 95%CI, 0.21-0.76; OR=0.52, 95%CI, 0.29-0.91). Vegetable fibre intake showed similar inverse associations (Q4 vs Q1: OR=0.51, 95%CI, 0.31-0.85; OR=0.48, 95%CI, 0.25-0.91; OR=0.53, 95%CI, 0.29-0.97). In addition, inverse associations were observed between soluble fibre and insoluble fibre and both colorectal cancer and colon cancer. No relationship was found between colorectal cancer and fruit, soy or grain fibre intakewhen the results were stratified by tumour site. Conclusions: The present study suggests that vegetable fibre and total fibre play very important roles in protecting against colorectal cancer. Soluble and insoluble fibres were inversely associated with only colorectal cancer and colon cancer.

Retrofitting of squat masonry walls by FRP grids bonded by cement-based mortar

  • Popa, Viorel;Pascu, Radu;Papurcu, Andrei;Albota, Emil
    • Earthquakes and Structures
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    • v.10 no.1
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    • pp.125-139
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    • 2016
  • For seismic retrofitting of masonry walls, the use of fibre reinforced cement-based mortar for bonding the fibre grids can eliminate some of the shortcomings related to the use of resin as bonding material. The results of an experimental testing program on masonry walls retrofitted with fibre reinforced mortar and fibre grids are presented in this paper. Seven squat masonry walls were tested under unidirectional lateral displacement reversals and constant axial load. Steel anchors were used to increase the effectiveness of the bond between the fibre grids and the masonry walls. Application of fibre grids on both lateral faces of the walls effectively improved the hysteretic behaviour and specimens could be loaded until slip occurred in the horizontal joint between the masonry and the bottom concrete stub. Application of the fibre grids on a single face did not effectively improve the hysteretic behaviour. Retrofitting with fibre reinforced mortar only prevented the early damage but did not effectively increase deformation capacity. When the boundaries of the cross sections were not properly confined, midplane splitting of the masonry walls occurred. Steel anchors embedded in the walls in the corners area effectively prevented this type of failure.

Structural behaviour of HFRC beams retrofitted for shear using GFRP laminates

  • Vinodkumar, M.;Muthukannan, M.
    • Computers and Concrete
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    • v.19 no.1
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    • pp.79-85
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    • 2017
  • This paper summarizes the experimental study of the shear behaviour of Hybrid Fibre Reinforced Concrete (HFRC) beams retrofitted by using externally bonded Glass Fibre Reinforced Polymer (GFRP) laminates. To attain the set-out objectives of the present investigation, steel fibre of 1% and polypropylene fibre of 0.30% was used for hybrid steel-polypropylene fibre reinforced concrete: whereas for hybrid glass-polypropylene fibre reinforced concrete, glass fibre by 0.03% and polypropylene fibre of 0.03% by volume of concrete was used. In this study, 9 numbers of beams were cast and tested into three groups (Group I, II & III). Each group containing 3 numbers of beams, out of which one serve as a control beam or a hybrid steel-polypropylene fibre reinforced concrete beam or a hybrid glass - polypropylene fibre reinforced concrete beam and the remaining two beams were preloaded until shear cracks appeared up to 75% of ultimate load and then preloaded beams (damaged beams) were retrofitted with GFRP laminates at shear zone in the form of strips, as one beam in vertical position and another beam in inclined position to restrict the shear cracks. Finally, the retrofitted beams were loaded until failure and test results were compared. The experimental tests have been conducted to investigate various parameters of structural performance, such as load carrying capacity, crack pattern and failure modes, load-deflection responses and ductility relations. The test results revealed that beams retrofitted using GFRP laminates considerably increased the load carrying capacity. In addition, it was found that beams retrofitted with inclined strip offers superior performance than vertical one. Comparing the test results, it was observed that hybrid steel-polypropylene fibre reinforced concrete beam retrofitted with GFRP laminates showed enhanced behaviour as compared to other tested beams.

A Study on Correlation Between Separation and Orientation of Fibres During Compression Molding of Long Fibre-Reinforced Polymeric Composites (장섬유강화 고분자복합판의 압축성형에 있어서 섬유의 분리와 배향의 상관관계에 관한 연구)

  • 이동기;유정훈;김이곤
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.17 no.1
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    • pp.62-68
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    • 1993
  • During compression molding of fibre-reinforced thermoplastics, the two main problems such as the fibre-matrix separation and the fibre orientation are produced by the flow state. As the molded product tends to be nonhomogeneous and anisotropic due to the separation and the orientation, it is necessary to clarify these in relation to the molding process variables and the fibre structure (fibre entanglement). If the entanglement of fibre structure is strong, the separation increases and the orientation is not easily aligned. Namely, these are inseparably related to each other. The correlation between the separation and the orientation have to be clarified for designing the fibre structure. In this paper, the degree of nonhomogeneity which is a measure of the separation is obtained using one-dimensional rectangular shaped part compression molding. And the orientation function is defined and measured by the image processing using soft X-rayed photograph and image scanner. Correlation between the degree of nonhomogeneity and the orientation function is discussed.