Determination of pilling performance of fabrics using a circular track pilling tester

Product Description:

The circular path pilling tester is a household appliance designed and manufactured by Shanghai Qianshi Factory. The pilling condition of knitted and woven fabrics is used to identify product quality and process effect.

Applicable standards:

GB/T4802.1, JIG040, DIN53863.2

During the process of wearing the fabric, due to its internal structure ( fiber type, fabric structure, post-finishing, etc.) and due to external reasons (friction, snagging, etc.) the undesirable phenomenon of pilling can easily occur, which seriously affects the wearing properties and aesthetic performance textile clothing. There are currently four test methods for pilling of textiles and garments in my country: Circle Track Method, Modified Martindale Method, Pilling Box Method, and Random Drum Method. c method standardscorresponding are GB/T4802.1-2008, GB/T4802. T4802.2-2008, UK/T4802.3-2008 and GB/T4802.4-2009. According to statistics from the testing agency, the circular pilling method is most frequently used among these testing methods. The circular pilling tester is a testing and testing instrument. The manufacturer is Standard Group (Hong Kong) Co., Ltd. Greet customers requiring telephone information.

Pilling Mechanism:

Textiles are often worn, used and washed daily and are constantly exposed to external and internal friction and other forces. It is gradually pulled out and protrudes, and there are a lot of small fluff on the surface of the textile. This process is called “fluffing”. During long-term use, the fluff does not immediately detach from the textile surface, but tangles into many dense spherical shapes. In the case of small grains, this process is appele pilling. The circular toe test uses either a nylon brush and a cloth abrasive test material, or simply a cloth abrasive medium. According to the specified test method and parameters, the test sample is rubbed to cause pilling, then the pilling of the fabric is visually described and evaluated under the light source irradiation conditions specified in the evaluation panel. As the main test materials, fabric scouring pads, foam pads, and nylon brushes have a major impact on fabric pilling assessment.

Influencing factors:

1. Textile abrasives

Standard The regulations for cloth abrasives in China are as follows: the material is 2201 full wool gabardine, the fabric structure consists of two upper and two lower straight twill weaves, the linear density is 19.6 tex × 2, the twistis Z625-S700, and the density is 445/10cm ×244/10cm. The weight is 305g/m2. The rules for replacing the abrasive cloths in Appendix A are as follows: The long-term test will lead to wear of the abrasive cloths to avoid this situation of correct assessment of the degree of pilling of the sample is impaired. The 2201 gabardine used as the abrasive cloth must be calibrated regularly, and the new abrasive cloth can be tested after pre-sanding: with the same cloth made of old and new, if the difference in the rows of pilling determined during the Gabardine sanding is superior by half a grade, a new abrasive cloth should be replaced in due course. However, it does not indicate what specific parameters the abrasive should be pre-sanded before being used in the test. It is not specified: the degree of pilling of different types of fabrics is also very different, and new and old gabardine abrasives ont a difference of more than half a grade. What standard fabric is used? It is not clearly defined which test parameters are selected as reference. In JF (Textile) 031-2013 “Calibration Specification for Fabric Pilling Instrument (Circular Track Method)” inspection of textile abrasives is not mentioned in calibration items and calibration procedures of the instrument. These flaws can affect the accuracy of laboratory assessments of pilling.

It is proposed to supplement the pre-grinding parameters of abrasive cloths in the standard, e.g. B. what type of standard mesh is used and how often is it pre-sanded, under how many pressure conditions, and the reference mesh for pilling assessment to supplement the old cloth abrasive regulations, uniform standard materials and test parameters.

2. Plastic foam gasket

The specifications for theFoam plastic gaskets in the standard are: gasket diameter, thickness and mass per unit area are approximately 105 mm, 8 mm and 270 g/m2 respectively. Only the approximate value of each parameter is vaguely given, and the upper and lower tolerances are not detailed, reflecting the density, hardness and thickness of different foam gaskets used by test institutes will be inconsistent, which will affect the accuracy of test results.

Sudan Xia investigated the effect of foam gasket thickness and hardness on fabric pilling results. Their results showed that plastic seams of different thickness under the same curing conditions can cause the degree of fabric pilling to differ by a notch. Under the condition of the same thickness, the degree of pilling of plastic gasket fabrics of different hardness can be half a class. Dong Yue studied the effectof the bulk density of foam plastic gaskets on fabric pilling results. The results showed that plastic gaskets with different bulk densities have a greater influence on the degree of pilling of synthetic staple fiber blended fabrics, which can lead to pilling. The notes are separated by one level.

It can be seen that the loose settings of the foam seals will have a greater impact on the test results. It is recommended to formulate strict parameters by specifying its mass per unit area, upper and lower tolerance ranges of thickness and hardness in the detail size.

3. Nylon brush

The rules for nylon brushes in the standard are: 150 nylon threads are planted in each hole of the nylon brush, the diameter of the hole is 4.5mm and the distance between each hole is 7mm. The diameter is 0.3mm; The stiffness of the yarnnylon used must be uniform: the surface of the nylon brush must be flat and level. The effective height of the nylon thread can be adjusted up and down by the adjustment plate to control the fluffy effect of the nylon brush. Additionally, Appendix A has been updated to include the description of the nylon brush adjustment. Since a nylon brush plays a major role in the lofting of fabrics, the relevant regulations of the standard are too general, e.g. B. The nylon wire stiffness of the nylon brush preparation material, the pre-grinding parameters of the new nylon brush, and the height range of the nylon brush used in the test. All of them have a major impact on the pilling behavior of the fabric.

The stiffness of nylon filament is critical to the pilling performance of fabric influencers. The stiff nylon filaments cause the nylon brush to exert greater force on the fabric, ce which reduces fabric pilling; while the less stiff nylon filaments allow the nylon brush to apply less force to the fabric, resulting in fabric pilling. The quality is superior. The standard only mentions that the stiffness of nylon filaments should be uniform, but does not specify the stiffness value of nylon filaments in detail. Those used in the circular path pilling test currently on the marketThe nylon brushes used come from different manufacturers. Device models used in laboratories across the country. Manufacturers are not the same, and the stiffness of nylon brushes is not uniform, which greatly affects the accuracy and consistency of test results.

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