mation about the Neps content, this is the sample size which can be tested by other Neps testers available on the market. & S.) in the form of a cylinder approximately 5 cm in diameter and 8 cm deep, with spaces of about 2 cm between the wires. 5.1 Entangled cotton fibers that form neps have two sources: those that occur naturally as the cotton fiber develops on the plant into lint that is ready to be harvested and those that occur from mechanical action in harvesting, ginning, cleaning, carding or from a combination of mechanical action. 1.3 The values stated in SI units are to be regarded as standard. Even in small amounts neps can affect textile quality and cotton marketability. ... For consistent test results, fiber samples should be conditioned in the laboratory environment with the above-mentioned ambient conditions for 24 hours. ... Neps in cotton processing. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. The test from the two laboratories should be compared using a statistical test for unpaired data, at a probability level chosen prior to the testing series. Procedure— Prepare a test basket, weighing not more than 3 g, from copper wire approximately 0.4 mm in diameter (No. The USTER®HVItesting system (High-Volume Instrument) uses the latest measurement technology for the testing of large quantities of cotton sam- ples within a minimum amount of time. For almost all types of yarn or fabric, neps are considered defects. An update on new chemical test methods to detect dye resistant neps in raw cotton, Proceedings of the Beltwide Cotton Conference National Cotton Council, Memphis, TN 1991, 878 – 879. Higher numbers of neps were detected in cage-ginned lint using the microscope versus AFIS measurements, probably because cage-ginned lint neps … 11.6(a). 5.3 The measurement of nep size and quantity going into, and coming out of, a fiber processing stage are commonly used to make adjustments in the processing machinery to reduce or eliminate the generation of mechanical neps. 1.3 The values stated in SI units are to be regarded as standard. At a minimum, ensure the test samples to be used are as homogeneous as possible, are drawn from the material from which the disparate test results were obtained, and are randomly assigned in equal numbers to each laboratory for testing. NATI Neps and Trash tester. 5.4 This test method provides a consistent and repeatable measurement of fiber nep count and size. A significant occurrence of neps level in the yarn often causes a fabric to be down-graded or rejected. Cotton fibres are exposed to two or more stages of lint cleaning in ginning process to meet demand for cleaner cotton and to improve cotton grade. However the lint cleaners increase the seed coat neps and reduce the fibre length. D1441 Practice for Sampling Cotton Fibers for Testing, E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method, ICS Number Code 59.060.10 (Natural fibres), ASTM D5866-12(2020), Standard Test Method for Neps in Cotton Fibers, ASTM International, West Conshohocken, PA, 2020, www.astm.org. Dead or immature fibers have a very thin cell wall, and appear as a thin fiber ribbon. Suitable for cotton, synthetic and blended slivers as well as raw cotton material. ... Statistical differences were measured using a paired t-test at 95% of confidence. Neps are created when fibres become tangled in the process of cotton harvesting, ginning and spinning. Published online: 8 Dec 2016. 2. Fiber entanglements or neps are the main source of impurities in cotton, followed by seed- coat fragments and non-seed impurities. 2. Cotton stickiness phenomenon (also called "sugar" - honeydew) changes from season to season. These are neps, length, maturity, and trash in cotton fibers and blends as described under ‘Applications’ below. 1.3 The values stated in SI units are to be regarded as standard. standard data known from cotton classification, detailed analysis of process relevant fragments such as neps, seed coat neps, trash and stickiness are integrated. It is caused by a large and variable source of contaminations. Google Scholar 7. Check cotton samples supplied by the manufacturer are used to verify consistent measurement levels and Mature fibers develop thicker cellulosic walls, and tend to convolute. Volume 29, 1999 - Issue 3. Cotton on the seed or carefully removed by hand from the seed contains very few neps. Standard References. The most common originates from insect secretion (mainly from white-fly and aphid), or from vegetals (like oils, seed glue, crushed seeds, etc. The mechanical processes such as harvesting, ginning, cleaning, carding, and combing affect the amount of neps in cotton. 5.2 This test method does not identify whether the neps counted and measured are a result of seed variety, environmental influences, type of harvesting, or a result of mechanical processing. 1.1 This test method covers the measurement of the quantity and size of neps in cotton using various instruments. PROGRESS IN AIR-JET SPINNING. 5.5 This test method is considered satisfactory for acceptance testing when the levels of the laboratories are controlled by the use of the same reference standard cotton samples because the current estimates of between-laboratory precision are acceptable under these conditions. For almost all types of yarn or fabric, neps are considered as serious defects. 1.2 This test method is intended for testing ginned cotton and cotton taken from various fiber processing stages. It is a high-performance system that permits the annual classification of entire cotton crops. In a best-case scenario, a cotton bale will have about 100 to 200 pure fiber neps per gram. 1.2 This test method is intended for testing ginned cotton and cotton taken from various fiber processing stages. Article. 5.4. If a bias is found, either its cause must be found and corrected, or future test results for that material must be adjusted in consideration of the known bias. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. No other units of measurement are included in this standard. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. Textile Progress. The test from the two laboratories should be compared using a statistical test for unpaired data, at a probability level chosen prior to the testing series. Machine harvesting, lower fiber linear density (fineness), and more immature bolls at harvest are factors that contribute to neps. Immature Cotton and Cotton fabric with white . ). At a minimum, ensure the test samples to be used are as homogeneous as possible, are drawn from the material from which the disparate test results were obtained, and are randomly assigned in equal numbers to each laboratory for testing. Volume 48, 2016 - Issue 4. 1.2 This test method is intended for testing ginned cotton and cotton taken from various fiber processing stages. Products and Services / Standards & Publications / Standards Products, Active Standard ASTM D5866 | Developed by Subcommittee: D13.11, Permissions to reprint documents can be acquired throughCopyright Clearance Center All the samples were tested for neps, nep size, seed coat neps and their 1Introduction Agroclimatic conditions including sowing season and watering frequency during their growth are known to influence cotton fibre properties. This test method provides a consistent and repeatable measurement of fiber nep count and size. AFIS (Advanced fibre Information System) is used to measure neps in cotton. 1.1 This test method covers the measurement of the quantity and size of neps in cotton using various instruments. The comparison of individual means, concerning to Duncan’s multiple range test indicates the highest yarn neps percentage due to interaction of twist multiplier value of yarn neps 16.39% for T1 (3.50) followed by 16.11 and break draft (T x B) has been presented in Table III. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use.It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the … The documents listed below are referenced within the subject standard but are not provided as part of the standard. Measure of neps and trash content in cotton slivers A large number of tests on large size samples can be performed by NATI without the operator atten-dance thanks to its automatism. However, this information can be obtained from studies where samples are taken from plants in the field before harvesting and ginning, before and after cleaning, and carding before spinning. Today, it is intended to completely replace the subjective visual grade determined by the cotton classer. In addition, the test results obtained from the yarn testing instrument YARNMAP ® can be directly linked through the data system LabMaster TOP ® in order to achievethe Link to Active (This link will always route to the current Active version of the standard. quality levels with respect to neps as measured with Exhibit 5: Advanced Fiber Information System (AFIS®) Source: International Textile Center the AFIS® instrument. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard. Published online: 13 Jan 2009. Neps that remain in spun yarns have a direct influence on neps in fabrics .For almost all types of yarn or fabric, neps are considered defects. If there are differences of practical significance between reported test results for two laboratories or more, comparative tests should be performed to determine if there is a statistical bias between them using competent statistical assistance. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. In cotton spinning, neps are often associated with other defects, for example as in Fig. Check cotton samples supplied by the manufacturer are used to verify consistent measurement levels and laboratory-to-laboratory precision.
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