Weft Knitted Fabrics Test by Sweating Guarded Hotplate

Sweating guarded hotplate is a proven and trusted thermal and vapor characteristics device. Here we will analyze its application in testing weft knitted fabrics.

1. Moisture conductivity

Moisture conductivity means fabric conducting liquid water ability and it depends on fabric absorption ability to water. Wicking means fabric flowing freely under the pressure from liquid-gas interface in capillaries. The better vapor permeability fabrics have, the easier sweat discharges, therefore human surface temperature reduces and people will feel comfortable.

1.1 Test objects

8.3 tex/48f (75D/48f) wicking PTT, 8.3 tex/48f wicking PET

1.2 Test specification

Sample size 300*25mm, wicking time is 30s.

 

Swearting guarded hotplate

2. Moisture permeability

Moisture permeability means vapor going through fabrics ability. Human body moisture mainly comes from perspiration evaporation; Gaseous sweat spreads out through fiber absorption-dismiss moisture and voids, thus moisture permeability is an important feature to measure fabric swearing guarded ability.

2.1 Test objects

NO.1   8.3tes/48f PTT (four groove deformed section)

No.2   8.3 tex/48 f PET (four groove deformed section)

No.3   8.3 tex/48 f PET plus 8.3tex (four groove deformed section)

No.4   8.3 tex/72 f PET water Hydrophilic agent process

2.2 Tester

YG601 computer moisture permeability tester

2.3 Test specification

Oven temperature 160℃, moisture permeability chamber temperature 38 ℃, humidity 90%, Hygroscopic agent Anhydrous calcium chloride

2.4 Test result

NO.1  6 043 g/m2•d

NO.2  5 715 g/m2•d

NO.3  5 611 g/m2•d

NO.4  5 304 g/m2•d

 

PET fabrics for sweating guarded hotplate

 

PTT fabric for sweating guarded hotplte

Conclusion

From the test data, we come to conclusion that PTT fabric is better than PET fabric due to their different regain of 1.22% and 0.4% respectively. The large regain ensures stronger Hydrophilic capacity. In terms of fiber structure, PTT fiber has loose molecular structure and the crystallinity is less than 50% while PET is more than 80%.

From NO.3 and NO.4 data, we can tell that samples with deformed section are superior to those with water hydrophilic agent process. Deformed section increases fiber gaps and moisture absorption ability; besides, it has bigger surface for more water absorption.

Water Hydrophilic agent increases moisture absorption ability, but has poor effect because it can only change fabric superficial features rather than its inner structure ( like thickness and porosity).

PTT deformed section fabrics have better moisture permeability than PET fabrics, thus they are ideal moisture wicking polyester materials for sweating guarded hotplate testing and will have further application in textile industry.

For more professional information on sweating guarded hotplate or textile testing instruments, please contact QINSUN Instruments.