## Yarn on the basis of knowledge

First, the calculation method of yarn Yarn

1. Unit

⑴, fixed-length system:

A. Turks: 1,000 m length of yarn in the Public regain the quality of the special number called a few grams.

Formula: Ntex = (G / L) × 1000

Where: G for the yarn weight (kg), L for the length of yarn (m)

Dan Neil B.: 9000 m long wire in the Public regain the quality of a few grams of Dan called a few.

Formula: Nden = (G / L) × 9000

Where: G wire to the weight (kg), L for the length of the wire (m)

⑵, heavy-set:

A. number of public support (public support): 1 gram yarn (silk) with the length of several meters.

Formula: Nm = L / G

Where: 1 for the yarn (silk) length (m), G for the yarn (silk), weight (kg)

B. Support a number of British (and British teams): 1 pounds of yarn by 840 yards in length with the number.

Formula: Ne = (L / G) × 840

Where: L for the yarn (silk), length (yards), G for the yarn (silk), weight (pounds).

2, unit conversion

A. Ntex number of special branch and British number Ne

Ne = C / Ntex (C is a constant, 590.5 for the chemical fiber, cotton fiber for the 583, can be blended as mixed than the calculated, such as: T / JC (65/35) 45S yarn C = 590.5 * 65% + 583 * 35% = 588, then can be calculated)

B. Ne with the number of British branch metric several teams Nm

Pure Chemical Fiber: Ne = 0.5905Nm cotton: Ne = 0.583Nm

Blended yarn: T / JC (65/35) 45S Ne = (0.5905 * 65% +0.583 * 35%) Nm

3, a few special Ntex metric and Nm

Ntex × Nm = 1000

4, a number of special Ntex and Dan several Nden

Nden = 9 * Ntex

Second, twist and twist factor

1. Twist: the length of yarn within the unit back to twist a few. Cotton yarn and cotton-fiber yarn Turks (number) system twist Ttex, yarn is 10cm in length with the twist that the number back; British branch a few twist-Te, based on the 1-inch twist to that number. Worsted wool and synthetic filament yarn twist of Tm, is based on each meter to twist a few said that the above methods of the relationship:

Ttex = 3.937Te = Nm/10 Te = 0.254 Ttex = 0.0254Tm

Back at Z-twist-twist and two S-twist. The yarn fiber or strand of yarn in twisting, twisting back in the direction from the bottom up, from left to right is called the S-twist; bottom, left to right of self-called Z-twist.

Shares back to the line twist that the way to the first letter that the yarn twist to the second letter that shares the line to twist. After two twisting of the strand, the first letter that the yarn twist to the second letter said that in the early twist to the twist, the third letter said that the complex twist to the twist, for example, for Z-twist yarn, twist to the early S-twist, twist for the resumption of Z-twist the strand, to twist to the ZSZ said.

2. Twist factor

Several special-twist factor αtex = Ttex * Ntex1 / 2

British twist factor αe = Te / Ne1 / 2

Metric twist factor αm = Tm / Nm1 / 2

A number of special factors αtex twist-and British-twist factor αe the relationship between:

αtex = Ttex * Ntex1 / 2 = Te/2.54 * 10 * 5831 / 2 * Ne1 / 2 (583 for the varieties of cotton factor, if blended, chemical fiber yarn please refer to the number of British special conversion constant changes in C)

Third, the strength of yarn and yarn breaking strength

Single Strength: pull off a single yarn needed, called Single yarn strength or power, is the cattle (N), Lower Ngau (CN).

Single breaking strength: The strength of yarn and the yarn P ratio Ntex number of special units are Km or cN / tex

Fourth, the standard weight

Textile materials in the Public Public water or moisture regain weight when they called the “standard weight”

Textile materials and the actual weight of a standard moisture regain see that under the weight of the relationship between:

Standard weight = see that the weight * (100 + Regain Public) / (100 + actual Regain)

In the production standards for the calculation of the weight. Often dry materials first, based on dry weight in the calculation, the formula is as follows:

= Standard weight of the dry weight of the material * (100 + Public Regain) / 100