Test method for fabric pilling tester for cashmere fabrics

Product Description:

During the wearing process, the fabric is constantly exposed to various external forces. Continued exposure to friction from the external force tangles the lint into balls and protrudes from the surface of the fabric. This phenomenon is known as fabric pilling. Therefore, attention should be paid to the pilling resistance of fabrics when designing fabrics, selecting clothing materials or controlling the quality of fabrics.

1. The process of pilling the fabric

(a) Indicates the fabric of \'origin ;

(b) Indicates the first stage, the fibers on the surface of the fabric are pulled out of the fabric by continuous friction to create a fluff;

(c) indicates the second stage, the non-shedding fibers are entangled with each other and intensify the fiber extraction;

(d) indicates the third stage, the entanglementnt of the fibers becomes narrower and finally forms small pellets;

(e) represents the fourth stage, the fibers connecting the pellets are broken or torn;

(f) represents in the fifth state, part of the spherulite falls [1].

2. Factors affecting the pilling of cashmere knitwear

Among the many factors of pilling, such as fiber properties, textile process parameters (yarn twist and fabric structure), post-dyeing and finishing treatment, wearing conditions, etc., fiber properties are the main cause fabric pilling.

1. Properties of raw materials

Cashmere fibers are fine, short and less crimped, and the cross section is narrow for a circle. Good elongation and elasticity, low bending stiffness and good fatigue resistance, these properties make the tfabric prone to pilling; among them are dwarf rate, fiber length and spreading length major influencing factors. Therefore, in the processing of cashmere products, cashmere raw materials should be appropriately selected according to product performance and use, and combined with other technological means to achieve effective pilling control. cashmere fabric.

2. Spinning twist

For knitwear, spinning is the most important influencing factor starting from from the principle that raw materials Pilling is the twist of the yarn, the magnitude of the twist of the yarn and the ratio of the twist coefficient all directly affect the pilling of the fabric. In twist formation, the twist of the single yarn determines the degree of cohesion between the fibers, and the twist of the twist determines the balance of the internal tension of the yarn, soe that the twist of the single yarn is the most critical factor in determining pilling.

3. Weaving Parameters

For cashmere knitwear the knitting density is inversely proportional to the stitch length, to the type of weaving. The density of the knitted fabric is small, and the length of the loop is large. When the surface of the fabric is rubbed by an external force, the yarn fibers are prevented from coming out of the yarn surface. The force is low and the end of the fiber protrudes slightly from the thread, which increases the risk of pilling the fabric.

4. Dyeing process

In the production process, the dyeing process affects the indicators of raw materials, The time of the dyeing process, the temperature and the pH value are the three elements that guarantee the quality of the dyeing, but they are also factors affecting the fiber indicators. When planningof food, technicians should take into account the degree of damage to raw materials during the dyeing process, in order to make full use of the various indicators of raw materials. The raw material index values ​​before and after dyeing have marked changes, the length decreases, the discrete length increases and decreases, and the short fuzz rate increases. Dyeing is seen to have an impact on the raw materials, two of which are affected by the pilling properties of the final product.

5. Finishing process

The finishing process of cashmere knitwear generally refers to the finishing process before the final product and mainly includes shrinkage, special finishes (eg anti-pilling, anti-shrinkage, etc.) and ironing and fixing. Fulling is an important link in the cashmere knit finishing process. The main trial factorssus that influence the grinding effect are: grinding medium, liquor ratio, temperature, pH value, time, mechanical force, etc. Whether the grinding process makes sense or not directly depends on the grinding process. This affects the quality of the appearance, the specifications of the final product and the pilling performance of the product output.

3. Plush cashmere performance test method

Customer-oriented, according to that provided by the customer standard, experience shows that generally, when cashmere products are tested by Martindale and Random Drum methods, the result is difficult to achieve grade 3 and above. For cashmere knitwear, the applicable anti-pilling test method is I.C.I Pilling Box method, which now applies to GB/T4802.3 (hereinafter referred to as GB), ISO 12945-1 (hereinafter referred to as ISO ) and JSL1076. tested is a method (hereinafter referred to as JIS) ToFor comparison, the details are as follows:

1. Pilling test chamber

The regulations for the chamber rotary in GB and ISO standards are consistent, the size is 235 cubic mm, the thickness of the cork liner is 3.2 mm, and the replacement cycle is not specified; JIS standard specifies that the size is 23mm cube, the cork liner thickness is (3±0.2)mm, and the density is (0.25±0.03)g/mm², the tensile strength is 980 kPa (10 kgf/mm²) and the service life is 1500 hours. Density, tensile strength and service limit are not specified in GB and ISO standards. The speeds given in the three standards are all (60 ± 2) rpm.

2. Polyurethane sample loading tube

GB complies with the regulations for the loading tubes of ISO standard samples, tube length (140 ± 1) mm, thickeur (3.2 ± 0.5) mm, outer diameter (31.5 ± 1) mm, mass (52.25 ± 1) g; The JIS standard prescribes that the tube length is 150mm, the thickness is 3mm, the outer diameter is 31mm, the mass is 51g, and the limit is 47g. Replace them immediately if damaged, and the hardness will be (42±5)? specified.

3. Tape

Both GB and ISO standards state that the width of PVC tape is 19mm, and JIS dictates that it is around vinyl tape about 18mm wide.

According to GB and ISO standards, the sample size is 125 mm × 125 mm. After sewing at a distance of 12 mm from the edge, cut 6 mm from each end for the sewing deformation, turn it over and place it in the sample loading tube. Above are two samples in each direction of latitude and longitude. The JIS standard prescribes that the sample size is 10 mm × 12 mm. The sample is wrapped around the tubsample and then sutured with cotton thread. There are two patterns in the warp and weft directions.

4. Duration of test

In the UK it is recommended to return 7200r for spinning wool and 14400r for worsted spinning; there is no uniform rule in ISO Times; JIS normally specifies 10h for woven fabrics and 5h for knitted fabrics. For cashmere knitwear, both at home and abroad, 7200r is generally used for woolen spinning and 10800r for worsted spinning.

4.Conclusion

According to the analysis, the box test method pilling suits compared cashmere products. The quality requirements of cashmere products are constantly improving and more and more attention is being paid to the problem of fabric pilling. However, the main evaluation methods are mostly subjective methods, and different theLaboratories may obtain different evaluation results for the same sa. In order to unify the objective conditions such as standards for pilling test methods and test instruments, it is also necessary to unify the standard photos of each laboratory to reduce the dispersion of the evaluation results. the same sample.

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