The working principle of tape is mainly based on pressure and surface adhesion. Tape usually consists of a soft tape back and a sticky adhesive layer. When tape is used to bond two objects, people usually apply pressure on the tape with their hands or other tools to make the adhesive layer close to the surface of the object. Because the adhesive layer is soft, the pressure will deform the surface of the adhesive layer and fill it into the depression on the surface of the object, forming a larger contact area, thereby enhancing the bonding effect.
In addition, the sticky substance on the surface of the adhesive layer is usually a polymer containing sticky components, such as acrylic acid or vinyl acid. When these sticky components contact the surface of the object, they generate electrostatic attraction through intermolecular adsorption, combining the adhesive layer with the surface of the object to produce a bonding effect.
The composition of tape includes two parts: substrate and adhesive. The substrate provides the structure and strength of the tape, while the adhesive is the key part of the bonding, usually a layer of adhesive coated on the substrate. The earliest adhesives came from animals and plants. With the development of technology, modern adhesives are mostly synthetic materials.
