This part of GB/T 4802 describes a method for the determination of the resistance to pilling and surface change of textile fabrics.
2 Normative References
The following normative document contains provisions which, through reference in this text, constitute provisions of this part of GB/T 4802. For dated references, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, parties to agreements based on this part of GB/T 4802 are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 6529 Textiles - Standard Atmospheres for Conditioning and Testing (GB/T 6529 - 2008, ISO 139: 2005, MOD)
3 Terms and Definitions
For the purposes of this part of GB/T 4802, the following terms and definitions apply.
3.1 Fuzzing
Roughing up of the surface fibers and/or teasing out of the fibers from the fabric producing a visible surface change.
Note: This change can occur during washing, dry cleaning and/or wearing.
3.2 Pills
Entangling of fibers into balls (pills) that stand proud of the fabric and are of such density that light will not penetrate and will cast a shadow
Note: This change can occur during washing, dry cleaning and/or wearing.
3.3 Pilling
Generation of pills over the surface of the fabric.
4 Principle
Specimens are mounted on polyurethane tubes and tumbled randomly in a cork-lined box at a constant rotational speed. Fuzzing and/or pilling is assessed visually after a defined period of tumbling. Any special treatment of the laboratory sample, i.e. washing, cleaning, has to be agreed upon and shall be stated in the test report.
