US10407804B2 – September 10, 2019 – Elasticised yarn, a method for making said yarn and elasticised fabric made therefrom

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Inventors :

Paolo Benelli

Owner :

Benelli, Paolo

Application Number :

US13882725

Document Number :

US10407804B2

Priority Date :

January 1, 1970

Filing Date :

October 31, 2011

Date of Grant/ Publication :

September 10, 2019

Class :

D02G3 / 04; D02G3 / 32

Abstract

An elastic thread yarn comprising linen and/or ramié and/or hemp and an elastic thread, with a thread made of an elastomeric material, and a substantially inextensible yarn made of linen and/or ramié and/or hemp helically wound about the elastomeric core at a predetermined number of windings per length unit of elasticized yarn, wherein, for each metric count Nm, the number of windings substantially inextensible yarn of the elasticized yarn, is set between two values indicated by two curves ( 12, 13 ) which can be expressed according to exponential laws, for example, with the same exponent, i.e. according to equations of the form T=K N 0, 327 where K is 20 and 50, respectively. In particular, an intermediate curve 11 is such that, by choosing for a given metric count a number of windings proximate to curve 11 , this best feature balance is obtained. In an exemplary embodiment, the core comprises a bare elastic thread, i.e. an elastic thread that is not coated by other fibers. In another exemplary embodiment, the core comprises an elastic thread coated with a natural fiber as cotton or viscose, or with a combination thereof. The elastic thread yarn according to the invention provides elasticized fabrics containing linen and/or on ramié, which has, in particular, a better surface regularity than well-known elasticized fabrics comprising linen, and which is comparable with the regularity of the elasticized fabrics comprising natural fibers such as cotton, wool, etc. and synthetic fibers, and also allows using ramie and hemp yarns to make elastic thread yarns and fabrics, for example, for making cloth items.

Claim(s)

1. An elastic thread yarn comprising: an elastic thread, comprising a thread made of an elastomeric material; a substantially inextensible covering yarn that is helically wound about said elastic thread forming a predetermined number T of covering windings per length unit of said elastic thread yarn, wherein said substantially inextensible covering yarn comprises linen and/or ramie and/or hemp, said inextensible covering yarn having a predetermined metric count Nm, wherein said metric count Nm of said inextensible covering yarn is set between 8 Km/Kg and 80 Km/Kg (10000/8÷10000/80 dtex); wherein said covering windings are arranged next to each other to entirely cover said elastic thread according to a number T of covering windings which is responsive to a predetermined function of the metric count T=T(Nm), and wherein said predetermined function of the metric count T=T(Nm) is given by the equation: T=T (Nm)= K (1000 Nm) ? ??[1] where K is a number set between 25.9 and 46.7, and ? is 0.327.;
28. A method for making an elastic thread yarn comprising the steps of: prearranging a first spool containing a substantially inextensible covering yarn comprising linen and/or ramie and/or hemp, wherein said substantially inextensible covering yarn has a metric count Nm set between 8 and 80 (10000/8÷10000/80 dtex); prearranging a second spool containing a yarn comprising an elastic thread, wherein said elastic thread is made of an elastomeric material; co-axially mounting said first spool on a hollow spindle that is adapted to rotate about its own axis at a predetermined speed; pulling said elastic thread from said second spool through said hollow spindle at an unwinding speed; causing said elastic thread with said linen and/or ramie and/or hemp-containing yarn to pass through an orifice co-axial to said hollow spindle; said method comprising, furthermore, steps of pulling, through said orifice, said elastic thread yarn consisting of said substantially inextensible covering yarn wound about said elastic thread, and winding said elastic thread yarn at a predetermined winding speed about a third spool, wherein such method is carried out on a hollow spindle twisting machine, wherein the hollow spindle, the orifice and a guide means for forming said centrifugal helical path are provided by such hollow spindle twisting machine, wherein said winding speed, said unwinding speed of said elastic thread and said speed of said hollow spindle are selected in such a way to wind a number of covering windings of said substantially inextensible covering yarn per each linear meter of said elastic thread yarn which is obtained by the equation T=K (1000 Nm) ? ??[1] where K is a number set between 25.9 and 46.7 and a 0.327, and wherein said covering windings are arranged next to each other to entirely cover said elastic thread.

Summary

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