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    Wyświetlanie 1-6 z 6
    Tytuł:
    Design Of the Tension Mechanism Of a Knotter And Optimization Of the Motion Parameters
    Autorzy:
    Lan, Jiahao
    Feng, Pei
    Zhang, Junping
    Zhang, Ronggen
    Yang, Chongchang
    Powiązania:
    https://bibliotekanauki.pl/articles/2200745.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    chemical fiber
    filament knotting process
    knotter
    catenary
    knotting rate
    Opis:
    Currently, the knotting of chemical fiber filament packages in factories primarily comprises manual operations. It also has a high labor intensity and is subject to artificial subjective factors, due to which it is difficult to guarantee the quality of the finished fiber products. Furthermore, it also significantly restricts the intelligent construction of chemical fiber production. This work employs partially oriented yarn (POY) and full draw yarn (FDY) to develop an automatic knotting device. The catenary theory was used to confirm the state of the yarn and to determine the relevant parameters of the tension mechanism. The results showed that the developed automatic knotting device satisfactorily meets the conditions required for manual knotting. The curve equation that was calculated using the catenary conformations of the yarn state verified that the actual yarn state was consistent with the theory. Moreover, the work provides a theoretical foundation for subsequent mechanism optimizations.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2022, 6 (151); 12--18
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microarray-core based circular photonic crystal fiber for high chemical sensing capacity with low confinement loss
    Autorzy:
    Asaduzzaman, S.
    Ahmed, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/174575.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    circular photonic crystal fiber
    confinement loss
    elliptical core
    chemical sensor
    relative sensitivity
    Opis:
    In this article, a circular photonic crystal fiber based chemical sensor has been presented where core region is designed with an array of elliptical holes. The proposed structure is numerically investigated by using a full vectorial finite element method. From the numerical results, it is observed that introducing an array of elliptical holes helps to obtain the high relative sensitivity and realizes a low confinement loss. In addition, the increase in the value of the diameter of holes in the innermost ring enhances the relative sensitivity. Moreover, the increase in the value of the diameter of holes in the outermost ring reduces the confinement loss. In this work, we have considered an industrially valuable chemical ethanol. Simulation results disclose that the highest relative sensitivity of proposed photonic crystal fiber is 29.25% for ethanol and the confinement loss is 7.68 × 10–7 dB/m at the wavelength 1.5 µm.
    Źródło:
    Optica Applicata; 2017, 47, 1; 41-49
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Production of Spindle Palm Petiole Fiber Reinforced High Density Polyethyele Composites
    Autorzy:
    Nneka, Ejikeugwu L.
    Monday, Omotioma
    Nnaemeka, Omeje B.
    Uzoma, Eke R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839868.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Spindle palm petiole fiber
    Sodium hydroxide
    cellulose
    chemical composition
    Central Composite Design
    Response Surface Methodology
    tensile strength
    polyethylene
    Opis:
    The work is on the production of spindle palm petiole fiber reinforced high density polyethylene (HDPE) composites. The Spindle Palm Petiole Fiber (SPPF) and HDPE composites were produced using injection molding machine. SPPF were characterized to determine their chemical compositions. Central Composite Design (CCD) was applied as an optimization tool of RSM for cellulose and tensile strength. The chemical composition of the SPPF is cellulose (65%), hemicelluloses (17.1%) and lignin (14.1%). Surface modifications of the fiber enhanced the properties of the fiber. Quadratic model adequately described the relationship between percentage cellulose yield and variables: chemical concentration, mass/volume ratio and time. The cellulose content at optimal level is 60.3% at 3.5wt% concentration, 4g/l mass/volume ratio and time of 16hr. Also for the composite, the quadratic model described the relationship between tensile strength and temperature, fiber/polymer ratio and time. The optimum tensile strength of 42.0 Mpa was obtained at fiber/polymer ratio of 29wt%, temperature of 172 °C and time of 10 min. Water absorbed by the untreated fiber was high compared to the chemically treated fiber. The chemical treatment created a better interfacial bonding of SPPF/HDPE and this could be responsible for the observations.
    Źródło:
    World News of Natural Sciences; 2021, 38; 98-119
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of chemical treatments on the properties of oil palm petiole fiber composites
    Autorzy:
    Nneka, Ejikeugwu L.
    Wadzani, Gadzama S.
    Chistian, Asadu O.
    Chiamaka, Otisi B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193486.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    High density polyethylene
    Oil palm petiole fiber (OPPF)
    acetic anhydride
    chemical composition
    potassium chlorate
    sodium hydroxide
    tensile strength
    zinc chloride
    Opis:
    The effect of chemical treatments with acetic anhydride, potassium chlorate, sodium hydroxide and zinc chloride on the properties of Oil Palm Petiole Fiber composites was studied. The untreated and chemically treated Oil Palm Petiole Fiber (OPPF) was used in fabricating natural fiber/HDPE composites using injection molding machine. The chemical treatments on OPPF enhanced its chemical compositions and morphology. It was observed that the cellulose content at the peak for different treatment are 58.4%, 56.7%, 55.2% and 51.5% at 4wt% concentration for NaOH, KClO3, C4H6O3 and ZnCl respectively. The composites produced with chemically treated fibers performed better than the untreated one. The highest tensile strength of 44.2 Mpa, 39.1 Mpa, 35.6 Mpa, 31.2 Mpa and 25.5 Mpa was obtained at fiber content of 29 wt% for OPPF treated with NaOH, KClO3, C4H6O3, ZnCl and untreated OPPF respectively. Water absorbed by the untreated fiber was high compared to the chemically treated fiber. The chemical treatment created a better interfacial bonding and could be responsible for the improved mechanical properties.
    Źródło:
    World Scientific News; 2021, 158; 247-266
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemical transformation of chromed leather wastes into environmentally harmless fibrous biomass
    Autorzy:
    Malek, A.
    Benotmane, B.
    Aribi, C.
    Hachemi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/207383.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    biomass fiber
    chemical transformations
    leather
    FTIR
    Faurier Transform Infrared
    odpady skórzane
    biomasa włóknista
    przemiana chemiczna
    spektroskopia w podczerwieni z transformatą Fouriera
    Opis:
    Chemical transformation of leather waste into chromium free biomass has been investigated. The conversion was performed by extracting the toxic metal. The effects of several influential factors on the process have been studied using design of experiments. Optimal conditions of chromium extraction have been determined. The collagen fiber of the biomass obtained has been analyzed by the Fourier transform infrared spectroscopy (FTIR). The chemical mechanism allowing this transformation has been suggested. The infrared analysis showed that the collagen fiber of the obtained biomass presents chemical composition similar to that of native collagen fiber of non-chromed leather. These results demonstrated the almost complete extraction of chromium from leather waste and the conversion of these latter into an environmentally harmless biomass.
    Źródło:
    Environment Protection Engineering; 2016, 42, 3; 179-192
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of chemical foaming on the structure and selected properties of glass fiber reinforced PA6
    Wpływ spieniania chemicznego na strukturę i wybrane właściwości PA6 wzmocnionego włóknem szklanym
    Autorzy:
    Konczal, Natalia
    Nowinka, Bartosz
    Bieliński, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2202583.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    highly filled polyamide 6
    chemical foaming
    injection molding
    glass fiber
    mechanical properties
    morphology
    wysokonapełniony poliamid 6
    spienianie chemiczne
    wtryskiwanie
    włókno szklane
    właściwości mechaniczne
    struktura
    Opis:
    The effect of the chemical foaming on the structure (SEM) and selected properties of glass fi ber (30, 60 wt%) reinforced polyamide 6 (PA 6) was investigated. Density, tensile properties and Charpy impact strength were determined. Hydrocerol ITP 825 was used as a blowing agent in the amount of 2 wt%. The size of the pores and the foaming degree depended on the distance from the injection point. The smallest pore size (64 μm) was observed for 60 wt% glass fiber reinforced PA6.
    Zbadano wpływ procesu spieniania chemicznego na strukturę (SEM) oraz wybrane właściwości poliamidu 6 wzmocnionego włóknem szklanym (30, 60 % mas.). Oznaczono gęstość, właściwości mechaniczne przy rozciąganiu i udarność Charpy’ego. Jako porofor stosowano Hydrocerol ITP 825 w ilości 2% mas. Wielkość porów i stopień spieniania zależały od odległości od punku wtryskiwania. Najmniejszą wielkość porów (64 μm) stwierdzono w przypadku poliamidu zawierającego 60% mas. włókna szklanego.
    Źródło:
    Polimery; 2022, 67, 10; 475--482
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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