Generally caustic soda is used for degumming process. The decorticated fibres are cooked in vessels with 1-2% of caustic soda under pressure for 1 h. A slight mistake in the degumming process can spoil the quality of fibre, since the major component in ramie is cellulose and is sensitive to alkali. The high potential of ramie fibre is not fully exploited due to various techno-economic reasons. In India, national level institutes like National Institute of Research on Jute and Allied Fibre Technology (NIRJAFT), Central Research Institute for Jute and Allied Fibres (CRIJAF) are working to innovate ramie fibre in the front line. Again, from dielectric behaviour … It is essential to remove the excess of alkali by acetic acid treatment after chemical degumming, otherwise the fibre strength will be reduced. The stems of ramie grow to a height of 1 - … Hand and eye method and instrumental method. Mar 13, 2018 - Explore Bansky Bernadett's board "Ramie- Fiber" on Pinterest. Degumming is essential after fibre extraction. CHEMICAL COMPOSITION AND FIBRE PROPERTIES. Among all the bast fibres, major content of cellulose is found in the ramie. In Europe, Brazil and the Philippines, some modifications are made. Ramie fibre will be graded before taken in to processing industry. 110, Ramie, a fiber-yielding plant, by Lyster H. 4 and 5. The inherent draw backs of ramie fibre can be overcome by proper blending with natural/synthetic fibres. --- "Contribution from Bureau of Plant Industry." The extracted fibres contain approximately 25-30% gum12. The fibre is coarser and consists of hairs, projecting from the surface, its length varies considerably from 40-200 mm and the fibre diameter is around 25-30 μm. Firstly, process ramie fibers by the lattice distortion modification processing equipment. "Contribution from Bureau of Plant Industry." Attempts have been made by various researchers to spin ramie in blends with jute, silk, viscose and polyester fibres using jute and woollen spinning systems32-34. After degumming the cellulose content of the fibres are raised above 95%. Ramie fibre is easily identified by its coarseness, thick walls, lacks twist and has striated surfaces25. Natural fibres are gaining importance day by day in all over the world. It is harvested and processed to yield strong fibers of the same name, which are used in the production of textiles, twine, upholstery, filters, and sacking.Like flax, jute, and hemp, ramie is considered a bast fiber crop, meaning that the usable portion of the plant is found in its connective tissue structures. Apart from textile uses, ramie fibre can be utilised for the production of various diversified products. It is referred to as bast fiber. The coarseness of the fibre reduces its scope of application in apparels, but suitable blending may solve this issue. Then, the cortexes are scraped to remove shell and partial gums. Also, one should know the advantage and disadvantage of ramie fiber. It is also made into fabrics for household furnishings and clothing, frequently in … Still in present scenario, there is much scope for research and development on this valuable fibre. The market prize of ramie fibre is determined by grading system. From 4-5% of ramie ribbons are cleaned from the stalks, so that from 400-1400 pounds per acre are yield annually in the same period, the average yield ranging around a thousand pounds. Ramiè (the ramia) is an ancient natural fiber of vegetable origin derived from horticultural plants, the complex processing of the textile fiber makes ramie very rare in fashion, where we can highlight its use mainly in small tailoring companies. These discrepancies can be partly attributed to the effects of source of supply, method of processing, the test conditions, temperature and humidity, on the fiber strength. After three passages of successive drawing, the sliver was processed through jute roving machine and finally spun in to a yarn of 84 tex. The right time for harvesting is judged by the colour of the stems and the slowing down of their growth. Ramie is widely cultivated not only in China, Japan, India and Malaya, but also in Queensland, Mauritius, the Cameroons, the West Indies, Brazil, Mexico and the southern states of North America, South Europe. But it is only in comparatively modern times that the production of ramie fabric has become established on a commercial scale. Ramie, Fiber plants, ramie, plant fibers, natural history, plant cultural practices, harvesting, processing technology, crop yield, plant characteristics, economic outlook and situation Publisher ... Ramie, a fiber-yielding plant, by Lyster H. Degumming is not really a chemical problem but a technological one and good degumming requires good chemicals, good fibre free of extraneous materials and spinning technology and in addition a touch, which can only be acquired after long experience41. The prepared polymer composite has the lowest porosity, homogeneous surface structure, and the greatest interface bonding. Includes bibliographical references Addeddate From the Fig. 1 In China, ramie is planted as a key cash crop Generally it grows up to a height of 1-25 m, the leaves are heart-shaped, 7-15 cm long and 6-12 cm broad and white on the underside with dense small hairs. --- "Revision of, and supersedes Miscellaneous circular no. Because of this variable length, before the fibre is subjected to spinning process, it is cut in to uniform size. Degumming is still treated as trade secret by the mills that have perfected this art. Ramie fibre is one of the premium and oldest textile vegetable fibres. The yield of ribbons varies between 2-4% of the weight of the green plant and yield of degummed fibre is normally about one percent of the weight of the green plants. Lignin degradation starts at about 280°C and continues even above 500°C. It is one of the strongest natural fibres having rich cellulose content. There may be several reasons behind it, especially, the difficulties associated with decortication, degumming, pest and diseases. The ribbons of partially separated but not yet degummed fibre, are known as "China grass" and it is in this form that ramie is normally exported from China to European and other markets. Ramie is a flowering plant that is native to Asia. The type of mat used is imported from a Chinese supplier (based in Shanghai) by sea freight and is expected to have more energy related to transportation than e-glass, … Weight loss (%) ramie fibre subjected to heating in varied temperature, indicating nature of thermal decomposition, https://scialert.net/abstract/?doi=ajt.2017.1.9, FAO statistics, 2013, (a) Fiber yield hg ha, Varieties of ramie, white ramie and green ramie, SEM photograph of (a) Decorticated (b) Combined degummed and bleached ramie fibre, Chemical composition of bast fibres by percentage mass, Mechanical methods of extracting the fibre from the stalks and, particularly, for subsequent degumming of the strands are still in an experimental stage, Although flax, cotton and silk machinery have been utilized for processing, ramie is best prepared on machinery constructed primarily for the purpose, Surface of the fibres is very smooth and difficulty is encountered in making the strands interlock when spinning fine counts of yarns, so that ramie fabrics have a tendency to be uneven. A combined process technology for degumming and bleaching for ramie fibre in a single bath is under progress in NIRJAFT (National Institute of Research on Jute and Allied Fibre Technology), Kolkata. Finally analyse the effect of lattice distortion modification processing on the lattice structure of ramie fiber. Prolonged treatment with strong alkali and strong acids causes loss in strength of the fibre and also hydrolysis of cellulose. The problems associated with cultivation, decortication and degumming are the researchable issues. White ramie and green ramie as shown in Fig. Rajna and 1P. Instead, it must first undergo a severe pounding or scraping to remove the outer bark, which is administered by hand or by one of the many types of decorticating machines. Ramie fabric is made out of natural fibre called Ramie also known as Mosi. The blended yarns have good scope in the areas like home furnishing, upholstery and industrial fabrics. During this period, it can be harvested up to 6 times in a year. Either the fibre is imperfectly cleaned so that it can only be put to use for limited local purposes, or the output is much too low, or there too much wastage of fibre during the process of decortications11. China holds the monopoly in both production and exporting of ramie. Coming to the present condition of cultivation in India, very few areas of states like West Bengal and Assam is showing some interest and the production is very minimal. tenacissima), also referred as Chinese grass or white ramie, is a member of the Urticaceae family and principally produced in China, Japan, and several other South Asian countries . First harvesting can be done after 17 days of planting and followed by 45-60 days for the succeeding harvests. On the other hand, growers of ramie are not likely to produce large quantities of the fibre-unless they have a reasonable assurance that there would be a large demand for it. Still, countries like Brazil, India, Philippines, Taiwan, France, etc., are also cultivating ramie in small volumes. The use of ramie is limited by its price and spinning properties. Chemical processing is required for processing ramie. The gums of ramie are composed of araban and xylans which are insoluble in water but easily soluble in alkaline solutions. The existing jute grading system can also be adoptable in the case of ramie. The quality of decortication and fibre recovery also depend largely on the efficiency of the operator as well as condition of the plants. For proper extraction of fibre, efficient decorticating machines or decorticators are needed to be made available to the growers at reasonable price. In order that the fiber may lend itself more readily to the subsequent manufacturing operations, it is usually treated with an oily preparation composed in most cases of water, glycerine, wax and soap, when it is thoroughly softened, ramie is ready for processing22. The decorticator and decorticated ramie fibre is shown as in Fig. In the current scenario, there is no specialized spinning system in India is available for ramie and is spun in jute system. In a study the degumming of ramie with sodium metasilicate, alone or in combination with other alkali solutions such as sodium carbonate, trisodium phosphate and sodium metasilicate phosphate, has been reported23. In China elsewhere in the far East, ramie is used for a number of purposes such as clothing, table-cloths, handkerchiefs, etc. 9. 7. Cellulose is a polysaccharide (i.e., a polymeric sugar) which can be represented by a simple formula (C6H10O5)n. The chemical composition of ramie fibre is as shown in Table 1. During grading, the following parameters are to be checked. 2. In principle, any machine which is used for sisal or kenaf decortications can be adjusted for ramie. It is almost 6 times stronger than cotton, 2 times that of flax and almost equals silk in its lustre. The fibre possesses some very valuable properties because of its silky, luster, unparallel strength, durability and its suitability to blend with all other natural and manmade fibres. It possesses highest strength and length, good durability and absorbency with excellent lustre. PRELIMINARY PROCESSING OF RAMIE: FIBRE EXTRACTION. Dewey." The separated cells of ramie, known as "filasse" although white and clean, are still somewhat harsh and dry. Harvesting is done either by manually or by using mechanical harvesters. Long staple fibres can be used for spinning, where as short fibres are using for the manufacture of papers, composites, non woven and other products39,40. Before spinning, the fibres are sorted into three lengths, i.e., long, medium and short. Ramie (Boehmeria nivea) is a perennial crop valued for its strong bast fibers. Among nature fibres, cotton occupied supreme position in both production and consumption. Strong band at 1026 cm1, assigned to CO stretching in cellulose, hemicelluloses and lignin or COC stretching in cellulose and hemicelluloses30. Decorticators developed for ramie include small mobile types suitable for use in the field and larger machines designed for central operation. Harvesting: The stems are green until they are mature, but then they begin to turn brown, starting at the bottom. This study briefs the extraction, mechanical processing, fibre properties and value addition of ramie fibre. Still in present scenario, there is much scope for research and development on this valuable fibre. Awareness programs like exhibitions, seminars, training, etc., may encourage the farmers to grow ramie in vast areas. The retting process of ramie involves lots of chemicals and is labor-intensive. The weight loss is mainly because of evaporation of water and volatile substances (low molecular weight waxes and fats). The results show that, compared to long ramie fibers processed in a conventional ramie spinning system, the stretch-broken fibers, with reasonable fiber length and high length uniformity, can be processed in a cotton spinning system with high efficiency … It is one of the strongest fiber then others. The tenacity, wet strength, extensibility are increases. This study briefs the extraction, mechanical processing, fibre properties and value addition of ramie fibre. By decortication, the outer bark, the central woody core and some portion of the gums and waxes of the bast are mechanically removed. In another work36, degummed ramie fibre of cut staple length 20 cm was processed in flax carding system and subsequently blended with jute fibre during drawing stage. Ramie Title Ramie Processing treatment commercial processing Image Identification information Ramie-003-06-19-09-POL-400X-PM-9 Image capture digital Date of image capture 06/19/09 Microscopist L. Crawford Microscope Zeiss Axioplan Mounting agent and RI RI: permount 1.515 Microscopic technique Polarized light, fiber at maximum brightness Lumen type So, it is always better to remove the gum content of ramie fibre before going for the processing of the fibre. Today some of the fashion designers are showing much interest in ramie fabric due to its unique properties. The total lifespan of the crop ranges from 6-20 years4. An Overview, Microbial Lipases and Their Industrial Applications: Review, Study on the Physical Properties of Blended Rotor Spun Yarn, https://scialert.net/abstract/?doi=ajt.2017.1.9. The ramie plant is a hardy perennial belonging to the Urticaceae or Nettle family, which can be harvested up to 6 times a year. Ramie (Boehmeria nivea L. Gaud) is a wonderful fiber-producing plant species, but it has not received adequate care and attention from researchers.Ramie fiber is considered the longest, strongest and most durable of all known plant fibers. Most of the ramie fibre extracted is used in producing countries and only a small percentage reaches international markets. Unlike other major bast fiber crops, ramie fiber processing does not include retting, but does require degumming, suggesting distinctive features in pectin and the development and composition of fibers. Abstract. Removal of the gum enables the fibre to take a more crystalline form. Degumming can be done with chemicals like sodium hydroxide13,14 or with enzymes15-19 or with microbial action20. Properties of Ramie Fibers: The properties of ramie fibers are given below: Ramie is a cellulosic natural fiber. Ramie is commonly known as china grass, green ramie or rhea. Decortication should be completed on the day of harvest and if there are some left over, they should be kept moist by sprinkling water till decortications is done on the following day. Tensile strength of jute/ramie blended (50:50) yarn under normal dry and wet conditions were found to be better as compared to 100% jute yarn. Stalks becoming dry after harvest cannot be properly decorticated. Ramie fiber is one of the premium vegetable fibers. It is a durable fiber. Decortication is to be done immediately after harvest and therefore, a harvesting schedule is planned in relation to the decortications capacity of the machines used9. During eighteenth and nineteenth centuries, ramie cultivation became established in many areas of the western world. See more ideas about fiber, plant fibres, natural fibers. Ramie is a so-called bast fiber, like flax, jute, and hemp. In India it is called by different popular names such as Rhea, Popah, KhunKoora, Kurkunda etc. It is resistant to bacteria, mildew, mild alkalis, rotting26, sunlight and insect attack. Ramie is a unicellular cellulosic bast fibre. Unlike other bast crops, ramie requires chemical processing to de-gum the fiber. Ramie is most often blended with other fibres for its unique strength, absorbency, lustre and dye affinity. In some of the reported works32,35, blending of 10-15% raw or ramie partially degummed ramie with jute helps to spin good quality yarns of finer count in the range of 100-105 tex. It is highly crystalline fibre. In Japan, ramie is used for canvas, suit-cloth, mat-edge, cloth and a large number of other purposes7. Fabrics made from ramie fibre are comfortable to wear and looks like linen. Another difficulty with the crop is its very low production by itself. It is important that ramie should be harvested at the right time if the best fibre is to be obtained. It acts as an inhibitor for water and other chemicals to enter inside the fibre. preliminary processing of ramie: fibre extraction The fibre is derived from the inner bast tissues of the stem. Planters harvest ramie approximately every 60days by cutting mature bast and protect roots. The photograph of ramie plant is shown in Fig. The stems are green until they are mature, but then they begin to turn brown, starting at the bottom. Processing of Ramie Fiber with Enzymes for Nonwovens KEYWORDS : Ramie fiber, Hemicellu-lase, Pectinase, Cellulase, Needle punch, Nonwoven It was used in mummy cloths in Egypt during the period 5000 - 3000 BC and has been grown in China for many centuries. Ramie fiber needs to be processed specifically to get its texture comfortable and useable, because if not, it will have coarse texture. The fiber is composed of pure cellulose being resistant to microbial attacks. However, profitable growing for fibre purpose is based on the principle of as many cutting a year as possible and to produce the best results the plants requires a favourable climate with steady high temperature, a humid atmosphere and a well-distributed annual rainfall of not less than 1.125 mm. Generally two methods of grading are adopted. The ribbons of ramie, on their arrival at the factory, are greenish yellow to yellowish-white strips. Ramie is a premium plant fibre with several useful characteristics and improvements in processing methods may well result in ramie becoming a … As a result of degumming, the gummy matter will be removed and the fibre weight reduces by 22-25%. (Brittain Bragunier), KW - AgSpace KW - crop yield KW - economic outlook and situation KW - Fiber … Table 2 shows weight loss percentage of ramie fibre subjected to heating in varied temperature, indicating nature of thermal decomposition. N1 - Caption title. Now, the main problem of decorticating machine is, availability and that too at reasonable or affordable price by farmers. Ramie fibre is extracted through decorticator machine. There is no international grading system is available for grading of ramie fibre and the grading is done as per the standards developed by the ramie producing countries. After harvesting, if the ribbons are not to be stripped from the stalks right away and the fibre extracted, the cut stems or ribbons should be dried as soon as possible, to prevent bacterial attack. The processing of ramie fibers needs to start immediately after the plants are cut or else the pectin hardens and this makes it almost impossible to remove. Properties of degummed ramie fibres make it more attractive and better than cotton. Ramie fibre is a bast fibre obtained from the inner bark of the ramie stem3. Cortexes removed mechanically or manually in a process, so-called decorti-cations. A manufacturer can place an order for as much as, say, one million lb on the spot for cotton. After the fibre has been submitted to the degumming action, it is thoroughly washed and dried. Colour, strength, softness, length, fibre separation and defects (major, minor). Some users (textile mills) have lost interest in the fibre mainly because of the problems of irregularity of quality supply and as well as processing difficulties and these have further discouraged the industrial sector from promoting the use of ramie. The ultimate fibers are exceptionally long and are claimed to be the longest of vegetable origin, with one report claiming the fibers range up to 580 mm, averaging about 125 mm. In spite of the undoubtedly good properties of ramie fibre, the wide occurrence of the plant and the enormous amount of publicity which has been given to the subject from time, the fibre has not so far been developed or used on any large scale outside of China and Japan. Ramie fibre comes under bast fibre category, which can be classified as underutilised fibres. Ramie is one of the oldest fiber crops, having been used for at least 6,000 years, and is principally used for fabric production. Ramie has been used as a textile fibre in China and Southern Asia for centuries and it is said to have been known in ancient Egypt. It is also known as china grass2. They may be used in this form for coarse products, but if ramie is to be spun into yarns suitable for fine fabrics, the first process in the mill is to degum the ribbons. Ramie fiber. The medium-length fibre is either spun on its own, or spun together with the short fibre and any waste which is obtained during the dressing of the long fibre. The fibres support the conductive cells of the phloem and provide strength to the stem. The FTIR spectrum of raw ramie fibre is shown in Fig. Ramie is an important fiber crop used in textile processing. ASCI, Investigating the Physical Properties of Treated and Untreated Jute Fibre-Polyester Composites, Study on Improvement in Handle Properties of Wool/Cotton Union Fabric by Enzyme Treatment and Subsequent Polysiloxane-based Combination Finishing, Eco-friendly Surface Modifications of Wool Fiber for its Improved Functionality: The decorticator consists of a beater or breaker plate and a metal drum, which is equipped with steel beater blades or knives that are set at equal intervals on the periphery of the drum. Ramie may also be spun on the worsted and long draft cotton systems, but in the latter case stapled noils are used and usually blended with cotton or synthetic fibres37,38. It was used in mummy cloths in Egypt during the period 5000-3300 BC and has been grown in China for many centuries. They are not only using for making clothing, but also finds other diversified applications. The finest yarns are produced on the spun silk system developed by the Japanese, but this system is labour intensive. Mistakes in degumming process can ruin the fibre and cause a spinner considerable loss since the know-how for carrying the degumming operations are not freely available. The fibre is derived from the inner bast tissues of the stem. The highest yield is attained in the third and fourth years and maintained until the plant is about six years old8. Then use X-ray diffraction method to determine the crystallinity and orientation of pristine and modified ramie fibers. The adaptation of the plant to soil is another retarding factor. 1b. The plants should be cut when the flower begins to fall and the seed to form. The most significant factors involved in ramie degumming are the concentration of the chemicals, temperature, time and the methods employed to ensure that the degumming liquor penetrates to all parts of the ribbons. Ramie is also suitable for blending with both natural and synthetic fibres in different proportions. To make them suitable for spinning, the decorticated ramie fibre has to be degummed in an effort to separate the individual fibres free from gums, waxes and pectins and leave them in a soft, clean state with their strength and other textile characteristics intact. Ramie is one of the strongest fibers. Weight loss occurs between 290 and 380°C, mainly corresponds to cellulose degradation. On gum removal, the crystallites increase in width but deteriorate with regard to their alignment along the fibre axis21. Production of Ramie Fibre-Ramie (Boehmeria nivea), commonly known as China grass, white ramie, green ramie and rhea, is one of the group referred to as the bast fiber crops. The greater utilization of ramie depends upon the development of improved processing methods. It is stiff and brittle and it breaks when repeatedly folded in the same place. Washing of fibre from stems immediately after decortications has been shown to remove water soluble gums which reduce the dry weight of the fibre by 8%. Due to the presence of gum, the fibre becomes stiff and brittle. The bast of ramie cannot be removed from the woody tissue in which it is embedded by a simple retting process such as is used for flax, hemp and jute. Acid hydrolysis of native ramie cellulose fibre leads to aqueous suspensions of elongated nano crystals with high aspect ratio. Currently National Institute of Research on Jute and Allied Fibre Technology (NIRJAFT) is working for the development of a new grading system for ramie fibre. Aliphatic C-H stretching of cellulose and hemicellulose is indicated by the peak 1377 cm1 29. From the figure it is observed that after the chemical treatment, the fibres are found to be clean. These characteristics make it suitable for use in the manufacture of wide variety of textiles and value added products5,6. As mentioned above, ramie is not retted in the same way as are other stem fibres such as jute, hemp, flax, etc., because the pectinous substances in ramie are far more difficult to remove or break down than those present in these other fibres. It is having a moisture regain of around 12%. The extracted fibrous material, after washing, should be immediately dried or degummed to prevent the development of mildew. Ramie is similar to linen fiber. Ramie was one of the principal plant fibres used in the orient for making cloth before the introduction of cotton, which took place in China about 1300 AD1. The mechanical properties of plant fibres largely depend on the amount of cellulose, which is closely associated with the degree of crystallinity and the crystallite orientation of the fibre with respect to the main fibre axis24. Kenaf Ramie Fiber Processing Machinery Hemp Flax Decorticator And Raspador , Find Complete Details about Kenaf Ramie Fiber Processing Machinery Hemp Flax Decorticator And Raspador,Pineapple Fiber Decorticating Machine,Hemp,Kenaf Fiber from Shellers Supplier or Manufacturer-Zhengzhou Alpha Machinery Co., Ltd. This produces coarser count yarn but much less labour is required. Use of decorticators in the field saves the cost of transporting unwanted plant material to soil10. It gives better result when it wet. The technical difficulties may be summarized as: Apart from any economic or technical reasons, the development of any new fibre needs market development work of some kind. Lignocellulosic fibres like flax and ramie are also getting popularized in the current era. Lets have a look on the factors. China is the biggest producer of ramie fibre followed by Brazil and Philippines (Fig. Ramie is normally harvested two to three times a year, but under good growing conditions can be harvested up to six times per year. A novel low cost polymer composite using brown grass flower broom reinforcement is prepared. The peak at 1424 cm1 corresponds to the bending vibration of CH2 for crystalline as well as amorphous cellulose27. 8. There are 2 major varieties of ramie plants. The decorticated and chemically degummed fibres are as shown in Fig. 6. However, the development of a greater ramie industry has been hampered, first, by technical difficulties resulted from the nature of the fibre and secondly, by commercial difficulties attendant upon the introduction of most new textiles. It is having good wetting strength but poor in elasticity, abrasion resistance and wrinkle recovery. Unlike other bast crops, ramie requires chemical processing to de-gum the fiber. Bast fibres, like linen and flax are obtained from the phloem, or inner bark (or skin) of a plant. Ramie is still not used much by the textile industry largely because it is a high cost fibre due to its complex processing requirements. Ramie is used to make such products as industrial sewing thread, packing materials, fishing nets, and filter cloths. The greater utilization of ramie depends upon the development of improved processing methods. Ramie is normally harvested two to three times a year, but under good growing conditions can be harvested up to six times per year. Form the table 1 it is observed that the cellulosic content in ramie is much more than other bast fibre like Jute and Hemp. 9, it is inferred that, the thermal decomposition of ramie fibre was minimum up to 275°C. This fiber is used to blend with the cotton or wool fiber. Ramie fiber is very durable, is pure white in colour and has a … This machine is using to peeling the kinds of fibre from kind of ramie (ramee), jute, kenaf (ambary), hemp, etc. PROCESSING. The SEM images showing the effect of combined degumming and bleaching is shown in Fig. AU - Robinson, Brittain B. 1a). Another important problems associated with the ramie fibre is the removal of gums from the un-degummed crude fibres. The peak at 1328 cm1 correspond to aromatic skeletal vibrations, ring breathing with CO stretching in lignin components28 and 1161 cm1 corresponds to the C-O-C asymmetric stretching in cellulose I and cellulose II. The bast of ramie cannot be removed from the woody tissue in which it is embedded by a simple retting process such as is used for flax, hemp and jute. Became established in many areas of the fashion designers are showing much interest in ramie crop, return mainly. 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