Elastic is under constant tension.
It is stretched 2.5 to 3.5 times. The glue must hold it there. For months. That is the job of our Diaper Rubber Band Adhesive. It is used for waist elastics, leg elastics, barrier cuffs, and leak-proof elastics. This glue needs two core abilities. First, it must resist creep. The elastic does not pull back or go loose. Second, it must be stretchable. The glue stretches with the elastic. No hardness. No brittleness. No discomfort on the skin. A lot of customers ask us, "Why do my elastics keep going loose?" The answer is creep. You need an anti-creep glue.
SIS is the best base for elastic.
It naturally has high elasticity and good initial stickiness. We add high-softening-point resins to improve creep resistance. The working temperature is 140-160°C. At 150°C, the melt viscosity is 2500-4500 mPa·s. On high-speed lines of 400-800 diapers per minute, it forms a fine, even glue web. That web wraps around every elastic thread. The softening point is 85-95°C. That keeps the glue stable at body temperature. No flow.
Here is the anti-creep data.
At 40°C and 80% humidity for 7 days, creep displacement is less than 1mm. Creep recovery rate is over 95%.
|
Parameter |
Value |
|
Creep Displacement |
< 1 mm |
|
Creep Recovery Rate |
> 95% |
|
Viscosity (150°C) |
2500 - 4500 mPa·s |
|
180° Peel Strength |
8 - 15 N/25mm |
|
Safety |
HG/T 3948-2025, FDA |
The elastic does not go loose. The barrier cuff stays snug. The glue has very high inner strength. When peeled, the glue breaks itself. No thread slip. No residue. We offer three systems. SIS for good elasticity and tack. SBS for higher strength and heat resistance. Hydrogenated SBC/PO for low odor and sensitive skin. That is our Diaper Rubber Band Adhesive.
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