Shearing (textiles)

Shearing is a kind of mechanical finish in which the appearance of the fabric is enhanced by cutting the loops or raised surface to a uniform and even height. The machine may have a spiral blade similar to a grass cutting machine.^[1][2] A shearing machine can cut the loop or the pile to a desired level.^[3] Shearing was most commonly used to make woollens and worsted materials. It was a part of dry finishing of woollen and worsted goods. Previously, shearing was also a component of gigging or napping; when partially produced goods were exposed to shear in order to improve the impact of gigging or napping, the process was referred to as "cropping".^[4][2][5]

History

Most of the Medieval clothing and textiles were processed and finished manually. The finishing of English Woollens includes shearing. Shearmen were skilled artisans who used to shear the fabric by hand. Shearman's job was to nap the cloth manually, using teasels and shears to trim the pile. A silky and smooth feeling was produced by the gradual lowering of the nap. The process was referred to as "dry shearing". It was formerly an expensive and lengthy process compared to the "wet shearing" that was a rough process. During the early 17th century, two shearmen spent two weeks dry shearing three broadcloths.^[6]

Shearing machine

Shearing machine blades

A shearing machine is a machine equipped with shearing cylinder, ledger blade, fluff exhaust, and joint seam sensors. The machine operates similarly to a lawn mower. Seam joint sensors prevent seams from being cut.^[7][8][9]

Advantages

Moleskin and velvet are shorn materials in which pile is cut to a certain level.^[10][11] Other than imparting an aesthetic finish, shearing was also used to cut certain deformations, unwanted surface defects such as protruding yarns.^[1] In the case of polyester blends, a shearing machine is also useful for removing surface beads or naps of dyed fibers.^[7]

Sculptured effect

Shearing can also create certain effects, sculpted effects are achieved by flattening sections of the pile with an engraved roller and then the remaining upright sections are shorn off. Flattened portions are then steamed and raised.^[12]

Embossed velvet and plush fabric are created by weaving the pile high and shearing it to various levels, or by pressing a portion of the pile flat.^[11]

See also

• Pile (textile)

References

1. Elsasser, Virginia Hencken (2005). Textiles : concepts and principles. New York, NY: Fairchild Publications. p. 197. ISBN 978-1-56367-300-9.
2. Joseph, Marjory L. (1992). Joseph's introductory textile science. Fort Worth: Harcourt Brace Jovanovich College Publishers. p. 392. ISBN 978-0-03-050723-6.
3. Purushothama, B. (2019-01-31). Handbook of Value Addition Processes for Fabrics. Woodhead Publishing India PVT. Limited. p. 243. ISBN 978-93-85059-92-6.
4. American School of Correspondence; Timmermann, John F. (1909). Woolen and worsted finishing; a practical manual of instruction in the methods and machinery used in finishing woollen and worsted goods in general, and the processes involved in the special treatment of all types of standard fabrics. The Library of Congress. Chicago, American School of Correspondence. pp. 81, 82, 111.
5. Cyclopedia of textile work : a general reference library on cotton, woolen and worsted yarn manufacture, weaving, designing, chemistry and dyeing, finishing, knitting, and allied subjects. Getty Research Institute. Chicago : American Technical Society. 1907. pp. 80, 81.{{cite book}}: CS1 maint: others (link)
6. Medieval clothing and textiles. Vol. 3. Woodbridge, UK ; Rochester, NY: Boydell Press. 2007. pp. 98, 99. ISBN 978-1-84383-291-1.
7. Choudhury, A. K. Roy (2006-01-09). Textile Preparation and Dyeing. Science Publishers. p. 138. ISBN 978-1-57808-404-3.
8. Clark, M. (2011-10-25). Handbook of Textile and Industrial Dyeing: Principles, Processes and Types of Dyes. Elsevier. p. 71. ISBN 978-0-85709-397-4.
9. Karmakar, S. R. (1999-11-02). Chemical Technology in the Pre-Treatment Processes of Textiles. Elsevier. p. 54. ISBN 978-0-08-053947-8.
10. Cooke, J. Herbert (1922). The velvet and corduroy industry; a brief account of the various processes connected with the manufacture of cotton pile goods. Smithsonian Libraries. London, New York [etc.] Sir I. Pitman & sons, ltd. pp. 86–90.
11. Denny, Grace G. (Grace Goldena) (1923). Fabrics and how to know them;definitions of fabrics, practical textile tests, classification of fabrics. The Library of Congress. Philadelphia, London, J.B. Lippincott company. pp. 103, 42.
12. Hollen, Norma Rosamond (1979). Textiles. New York: Macmillan. p. 262. ISBN 978-0-02-356130-6.