Band-aids are commonly used protective equipment in people's daily life. In the process of use, there must be a phenomenon like this: when the band aids are torn off after being applied to the skin for a long time, a wound will appear on the skin. Stick to the contoured shape, with pimples and stickiness at the edges.
When this phenomenon occurs, some people may worry about skin allergies, but this is actually a normal physical phenomenon. The material of the band-aid is coated with a layer of adhesive. According to the environmental reasons such as temperature, pressure and humidity when it is applied on the skin, a certain degree of adhesive overflows, and then the overflowing part of the adhesive contaminates the textile of clothes or trousers fibers, forming edge bumps.
The degree of glue overflow is determined by the thickness of the band aids at the time of gluing, and the thickness of the glue will directly affect the stickiness of the bandage.
The grasp of the thickness of the glue coating process is a technology presented on the basis of a large number of experiments and market data. For example, band-aids in areas where the skin is prone to sweating need to be coated with thicker glue so that they can be pasted more firmly; for example, band-aid used for infants and young children should be coated with thinner glue to prevent excessive stickiness from damaging the tender skin.
Note that the band-aids is only suitable for hemostasis and protection of small superficial skin wounds.