Knitted fabric parameters | Piece length, width, thickness, yarn count, gram weight, fabric density

Fabric parameters refer to the yarns and fabrics involved in the fabric production process Basic information, such as yarn count, fabric weight, fabric density, width, weight, composition, shrinkage, etc., this article only gives a brief introduction.

length

The length of the knitted fabric is determined by the factory’s productionIt depends on the production process, mainly considering the fabric variety and dyeing and finishing process factors. One is the fixed weight method, that is, each piece of gray cloth is made into a fixed weight; the other is the fixed length method, that is, each piece is of a certain length. The length of the weft knitted fabric is mostly determined by the weight of the piece and then the width and weight per meter. The weight of a piece of commonly used cotton wool products is about 8 to 10kg, and the length of the piece is determined according to the width and weight per meter. The piece length of warp knitted fabrics is mostly determined by fixed weight.

Width

The width of weft knitted fabrics is mainly related to the knitting used for processing The width of the warp knitted fabric depends on the type and structure of the product.

Thickness

The thickness of knitted fabric is related to the volume weight, wear resistance, rigidity, flexibility and bulkiness of the fabric. When the knitted fabric has the same structure, its thickness is mainly related to the yarn diameter and the degree of mutual extrusion of the yarns; when the yarn linear density At the same time, the thickness of knitted fabrics is related to the fabric structure, density and raw materials. For example, jersey is a single-sided knitted fabric, and its thickness is generally measured with a fabric thickness meter. The pressure applied depends on the type of knitted fabric. The pressurization time is generally 10S.

Yarn linear density (yarn count)

Line density refers to the thickness of the yarn Line density is one of the most important physical properties of fiber. It not only affects textile processing and product quality, but is also closely related to the wearing properties of fabrics. Similarly, line density is also the most important indicator of yarn density. From the physical and mechanical properties, feel, style, etc. of textiles, it is also one of the important basis for fabric design.

Line density has many forms of expression, usually expressed as the ratio between length and mass. Currently, there are two types: penny-weighted and fixed-length.

Inspection method:

FZ/T 50005-2013 Test method for spandex yarn density

GB/T 14335- 2008 Test Method for Linear Density of Chemical Fiber Short Fibers

GB/T 14343-2008 Test method for linear density of chemical fiber filaments

GB/T 16256-2008 Test method for linear density of textile fibers – Vibrator method

FZ/T 50005-2013 Test method for spandex yarn density

GB/T 4743- 2009 Determination of normal density of skein of textile package yarn

SN/T 3588-2013 Knitted fabric center split Determination of linear density of lower yarn

GB/T 29256.5-2012 Textile woven fabric structure analysis method Part 5 : Determination of linear density of yarn removed from fabric

Take the commonly used GB/T 29256.5-2012 as an example. The method is as follows:

Operation: Condition the humidity of the sample for at least 24 hours, take 2 pieces in the warp direction and 5 pieces in the weft direction for testing. The length of each sample is ≥250mm, and the width is >50 pieces;

Test: Under pre-tension, test 10 lengths and take the average , weigh and calculate at least 50 pieces in total;

Pre-tensioning:

Method A: Humidify and weigh in standard atmosphere, and calculate.

Method B: Drying and weighing, and then calculating the moisture regain.

For example, Regarding the test methods, conversion results and expressions, they are as follows:

Gram weight

gram weight , also known as the mass per unit area, refers to the weight of the fabric per unit area, the unit is g/㎡

Inspection method:

FZ/T 01033-2012 Test method for mass per unit area and down content (covering) of pile fabrics

FZ/T 20008-2015 Determination of mass per unit area of wool fabrics

FZ/T 60046-2016 Towel products Quality test method per unit area