Md Sohanur Rahman Sobuj

Graphical Representation of Mass Variations

June 17, 2016 Md Sohanur Rahman Sobuj 0

4.66K

Graphical Representation of Mass Variations Graphical representations are aimed at providing easy analysis possibilities as well as providing more complete information than the numerical estimates. The following graphical representations are common with the latest generation evenness testers. Spectrogram 3D Spectrogram Variance Length Curve 3D Variance Length Curve Normal Diagram Cut Length Diagram Histogram Spectrogram The […]

The variation of weight of consecutive 1 inch lengths of yarn

Textile Testing & Quality Control-1

Yarn Evenness II It’s Classification

June 17, 2016 Md Sohanur Rahman Sobuj 0

3.68K

Yarn Evenness & It’s Classification Evenness, Unevenness, regularity, and irregularity are common terms used to describe the degree of uniformity of a textile product. In the textile ﬁeld, the uniformity of products like the lap, sliver, roving or yam is expressed in terms of evenness or regularity or in terms of unevenness or irregularity. A […]

Graphical Representation of Unevenness and Coefficient of variation

Fabric Engineering

Unevenness and Coefficient of Variation of Yarn

June 15, 2016 Md Sohanur Rahman Sobuj 0

9.76K

Unevenness and Coefficient of Variation of Yarn: The average value for all the deviations from the mean which is expressed as a percentage of the overall mean is called percentage of Mean Deviation (PMD). The coefficient of mass variation CV % is the ratio of standard deviation of mass variation divided by average mass variation.

Fabric Engineering

Index of Irregularity

April 18, 2016 Md Sohanur Rahman Sobuj 0

5.31K

The ratio between the actual irregularity present in the material and the calculated limit irregularity is called index of irregularity. It is denoted by I. Accordingly the best yarn have a value of I = 1. Thus, the higher value of I indicate that the yarn is more irregular. On the other hand, the CV of the most regular/uniform strand of material in which the ﬁber ends are laid in a random order in the sliver, roving, or yarn is called limit irregularity.

Four track single jersey circuler knitting machine

Introduction to fiber and textile fibers

Study on four truck circular knitting machine.

March 14, 2016 Md Sohanur Rahman Sobuj 0

3.65K

Most single-jersey fabric is produced on circular machines whose latch needle cylinder and sinker ring revolve through the stationary knitting cam systems that, together with their yarn feeders, are situated at regular intervals around the circumference of the cylinder. The yarns is supplied from cones, placed either on an integral overhead bobbin stand or on a free-standing creel, through tensioners, stop motionsand guide eyes down to the yarn feeder guides.

Textile Testing & Quality Control-1

Methods of Evenness Testing

January 30, 2016 Md Sohanur Rahman Sobuj 0

5.16K

The optical method measures the variations in diameter of a yarn and not in its mass. The instrument an infra-red transmitter and two identical receivers. The yarn passes at speed through one of the beams, blocking a portion of the light to the measuring receiver. The intensity of this beam is compared with that measured by the reference receiver and from the difference in intensities a measure of yarn diameter is obtained.

Draw Frame

Speed Frame Production Calculation

August 29, 2015 Md Sohanur Rahman Sobuj 4

16.91K

Math 1: Calculate the TPI (twist per inch) produced on a simplex with diameter of front roller 28 mm and its rpm be 30. The rpm of flyer is 1000.

Draw Frame

Twisting and Amounts of Twist for Different Materials – why is the amount of twist in a yarn important

August 29, 2015 Md Sohanur Rahman Sobuj 5

4.13K

The roving coming out of the front delivery roller is threaded through the top of the flyer, passes through its hollow leg around the presser arm on to the bobbin. The purpose of providing twist in roving is to give the strand sufficient strength to withstand the strain during unwinding in the creel of the ring frame. The insertion of twist is achieved by the rotation of the flyer.

Fabric Engineering

Shaded Twill Weave and Stepped Twill Weave

June 29, 2015 Md Sohanur Rahman Sobuj 0

4.05K

Shaded twill is formed shade effect on the surface of the fabric. The shade effect is created by the combination some thick to thin twills and thin to thick twills. Stepped twill is formed by steeping a continuous twill and keeping the direction of twill line same or opposite.

Fabric Engineering

Elongated Twill Weave and Combined Twill Weave

June 29, 2015 Md Sohanur Rahman Sobuj 0

5.39K

Elongated twill is constructed by advancing the points of intersection two or more threads in one direction and one thread in the other direction.On the other hand combined twill is formed by combination two regular twill and arranging them alternately with each others.