Whether domestic or international brand diapers, the mainstream urine display function is mainly divided into two kinds: one is the hot-melt wetness indicator adhesive technology, and the other is the ink urine display technology. Most of the urine display functions that will change color use hot-melt technology, while those that will fade and disappear mainly use ink urine display technology. So, which technology is better for users?

1.The difference between ink urination and wetness indicator adhesive

The principle of ink urination is to add colored small molecular substances to the ink. When urine comes into contact with them, the ink and these small molecules are washed away by urine, and the color disappears, so as to achieve the effect of prompt. However, some problems also follow. With the scouring of urine, these colored chemicals will gradually spread to the core layer, which not only destroys the beauty, but also has no obvious color effect of urine. In addition, these colored chemicals will rub with the core layer during intense exercise, which is easy to migrate and fall off, and eventually lose the function of urine display. In contrast, wetness indicator adhesive overcomes the above defects. It is not easy to fall off. It relies on hot melt adhesive to firmly adhere to the substrate. The color and shape before and after discoloration can always remain bright and complete, non-toxic and harmless.

2.Wetness indicator adhesive features

1.Safety it is non-toxic and reliable.

2.Thermal stability wetness indicator adhesive has thermal stability. When the temperature rises to more than 110 ℃, it is easy to carbonize, crust, and turn black. Under such high temperature, some components that promote its color change may separate, and ultimately cannot change its color. Therefore, its service temperature should be controlled within an appropriate operating range.

3.Environmental stability it has environmental stability. In the process of storing diapers, if they are exposed to moist air, they are prone to slow color changes, from yellow to green, and finally to blue, and lose urine display function due to water absorption. Therefore, it needs to be resistant to moisture in the air.

4.Strong discoloration. It has a strong and vivid color contrast change in the process of color change. When urine is attached to its surface, if the color change is not strong enough, the user will not be able to judge the color change through the translucent bottom film.

5.Washability it has washability, can resist multiple urine erosion, and does not fall off.

6.Rapid reactivity it has rapid reactivity. When urine is soaked, it will immediately change color, prompting parents to react.

7.Gradient color change wetness indicator adhesive also has the function of gradient color change. Because if the first urine makes the urine show the last blue, the second urine can no longer change its color, and it will lose the function of urine display. If you change diapers the first time you absorb urine, it will undoubtedly increase the cost. Therefore, it must have the function of slowly changing color. After each urine wash, its color will gradually deepen from yellow to green and then to blue. This can give parents more choice, use a certain color to judge the degree of water absorption of diapers, and replace them in time.

8.Good UV resistance.

9.Excellent aging resistance.

10. Easy to produce, operate and apply.

For most novice parents, the easiest way to judge when to change their baby's diapers is to observe the urine on the diapers. At present, the mainstream urine display technology is hot-melt wetness indicator adhesive technology and ink urine display technology. Knowing the difference between the two and the characteristics of this hot melt adhesive will help parents better choose and use diapers.