Why Fastness Issue when Screen Printing on Nylon Fabrics
Fastness aka adhesion has always been the most regular problem, especially for nylon fabric because it’s quite smooth and waterproof.
In fact, there are several kinds of nylon fabrics, we should distinguish to treat them specific and choose appropriate printing inks and operation instructions.
Other than natural fiber, nylon or polyester belongs to synthetic fiber and they have tight molecular structure so that they barely absorb water or even water proof.
On the other hand, they are very smooth.
The result is that printing inks’ molecule can not penetrate to fabrics interior and they cannot bound together completely.
However, people alway confuse the waterproof and water-repellent performance of textile. Actually, these two concepts are both connected and different in field of dye treatment.
Water repellency means material itself cannot adhere with water, for example, water forms running beads when it falls on Lotus leaf, it shows that lotus leaf has great water repellency.
In this case, if you make water-repellent treatment on Nylon fabrics, the fabrics would be as water-repellent as lotus leaf.
On the other hand, waterproof performance means water cannot penetrate. Like single-side glue-coat Nylon poncho can protect people from heavy rain since the rain can never penetrate the poncho.
Thus, if we make both waterproof and water
repellent treatment to Nylon fabrics, it would get function of waterproof, water-repellent, wind-protective and warm-kept. Usually, we make printing on no-coating side of Nylon fabrics instead of glue-coated side.
In this way, water-proof performance has no effects on printing or light effect, it is the water repellency affect the adhesion between printing inks and textile. The stronger the water repellency, the bigger the impact.
In field of dye treatment, the Organosilicon compounds we use for fabric’s water repellent treatment is also a kind of release agent which applied in heat transfer papers.
In this way, we can see what a difficulty water repellency bring to textile printing. On the other hand, since some fabrics only have water-proof performance, some only have water repellency while some have both performance due to different types of Nylon fabrics, we have to identify and test before printing. Only after dentification, we can choose exact ink items and printing methods for different fabrics.
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