Collection | Textiles & Clothing Inspection & Testing Basics

Collection | Textiles & Clothing Inspection & Testing Basics

Shrinkage test

1) Purpose: To determine the dimensional stability of woven or knitted fabrics after repeated washing in a household washing machine.

2) Principle: Before washing, mark the size on the specimen, and judge the size change of the specimen by measuring the change of the mark after washing.

3) Process: Select the washing and drying method, cycle and drying times according to the fabric type and customer's requirements, add standard detergent and appropriate water level to start washing and drying, and finally get the test results.

2

Physical property test

1) Main items.

Yarn count, density, gram weight, tensile strength, tear strength, seam slip, seam strength, top breaking strength, abrasion resistance, pilling resistance, etc.

2) Specific description.

Yarn count: refers to the thickness of the yarn, most of them are currently used in imperial count, expressed in Ne, which is defined as a multiple of 840 yards of the length rate of 1 pound of cotton yarn at a metric moisture return rate of 9.89%.

Density: The number of yarns per INCH.

Grammage: Ounce weight per square yard of fabric or gram weight per square meter of fabric.

Tensile Strength: The force used when a fabric of a certain size is stretched by a tensile strength machine at a constant rate until it breaks is the measured tensile strength. The test of tensile strength has grab sample method and strip sample method, according to different test standards and customer requirements to choose the specific test method.

Tearing strength: a certain size of specimen, clamped on the tearing strength instrument, cut all the mouth in the middle to determine the direction of tearing, tearing strength instrument using a pendulum to drop the specimen from the cut to tear the force used is the measured tearing strength.

Seam slip: After folding the fabric of a certain size, stitching along the width direction, cutting a certain distance away from the seam line, using the tensile strength meter with a constant rate of stretching to a certain seam opening force or stretching to a certain strength when the opening distance, is the seam slip we measured. The seam slip can be measured in two ways: constant opening force and constant force opening. Seam slip is generally only used for woven fabric testing.

Seam strength: the same as the seam slip, a certain size of fabric folded, along the width of the direction of the stitch, a certain distance from the seam line cut, the use of tensile strength instrument with a constant rate of stretching to make the seam line off the force used is the measured seam strength, seam strength can be carried out at the same time with the seam slip, generally only for the test of woven fabrics.

Top breaking strength: Under certain conditions, a flat fabric in a suitable angle spin plus an expansive expansion force, until it breaks, this force is the top breaking strength.

Abrasion resistance: Under the known pressure, the sample mounted on the specimen clip and the standard abrasive cloth under a certain pressure with a certain track rubbing each other, until the fabric appears the number of broken yarn or holes required by the customer, record the number of abrasion at the end of the experiment, is the measured abrasion resistance value.

Pilling resistance: the fabric will be tumbled and rubbed under specific conditions for a certain period of time to see its surface pilling, pilling refers to the formation of fiber tangled pompom clusters on the surface of the fabric. Pilling refers to the fabric surface fiber rough uneven and (or) fiber pilling, resulting in changes in the appearance of the fabric, its pilling is assessed by rating sample photo or original sample comparison.

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