Recently Viewed Basket Checkout. Empty Basket Your basket is empty, please click here to visit our home page and look for products. Please check your browser settings. TIME: All adhesives strengthen over time; when a label is first applied, the initial bond will strengthen until the adhesive sets into its ultimate adhesion.
At the moment of application: The reaction that takes place as an adhesive sets is influenced by temperature; a higher temperature will speed up the reaction, which means that labels applied at higher temperatures will usually have better adhesion than those applied at lower temperatures. It should also be noted that extremely cold temperatures can also have an impact: the reaction may be slowed down, preventing a bond from forming properly, or the adhesive may solidify in extreme cold preventing any reaction — and therefore any adhesion — from taking place.
SURFACE: Some surfaces are better suited to adhesives than others; the properties of the surface influence how well an adhesive is able to form a bond that is strong enough to hold a label in place on that surface.
Texture: surfaces can have peaks and troughs of various depths, ranging from smooth, flat surfaces to rough, uneven ones. Adhesive bonds are most successful when there is a large surface area available for the adhesive to bond to. Labels on sheets tend to have adhesives that are in a semi-fluid state; this means that the adhesives have some ability to move into troughs in a surface, which means that the best bonds are created when a label is applied to a surface with some shallow troughs as this increases the surface area available between the label and the item being labelled.
If a surface has no troughs or if the troughs are too shallow, the adhesive has a smaller surface area available to adhere to. Similarly, if there are too many troughs or if the troughs are too deep, the adhesive will not be able to reach all of the available surface area before it sets. Shape: surfaces can be flat or shaped e. Adhesion is the binding force between two different materials, whereas cohesion is the binding force between two similar materials.
When two materials are brought into contact with each other, the surface molecules interact, giving rise to attractive forces that may be physical, chemical or electrostatic corresponding to adsorption, covalent bonding or van der Waals forces, respectively. When the molecules are similar, as in the case of two 'glue molecules,' the cohesive force causes the glue to stick to itself. When the molecules are dissimilar, as in the case of a glue molecule and a molecule of the substrate the surface the glue is sticking to , the adhesive force holds the glue to the substrate.
Hence, the 'stickiness' of tape is caused by a combination of the molecular forces of the glue material sticking to itself as well as holding onto the substrate. A pressure-sensitive adhesive is a sticky, viscous, liquidlike material that adheres to a surface using only pressure. To function well, it should have good adhesion to a surface and good cohesion, or internal strength. For good adhesion, it is important that the adhesive can readily flow out on the surface.
The degree, or freeness, of the flow often determines the intensity of adhesion. Degree of flow depends on the difference between the surface energy of the material and the surface energy of the adhesive.
Pressure-sensitive adhesives tend to flow out on materials having a high surface energy--for instance, metals, glass and plastics such as acrylic, polycarbonate and nylon. Pressure-sensitive adhesives tend not to flow out as easily on low surface-energy materials such as polyethylene, polypropylene and Teflon.
For instance, paper stickers have glue that only sticks on paper, cardboard, etc. Similarly, if you try to paste a cloth sticker on the paper, you will fail no matter how hard you try because they have thermal adhesive only. Hence, you need to be aware of various stickers and the type of glue used in them to find the perfect fit for yourself. Paper stickers are one of the most commonly used stickers. They are usually square-shaped, and people paste them in their books and notebooks to make notes.
These stickers use rubber adhesives because it is easier to use them on different page material. Also, they have ideal resticking properties.
We all know it when we paste paper stickers. They cover a large portion of our text, and while reading or studying, the content is almost invisible. So, you can just remove them and paste them somewhere else! Easy peasy. Bumper stickers are large labels designed for automobiles. These stickers can either reflect your style or be a caution for all the drivers behind you.
Worry not, because getting customized bumper stickers is easier than ever before now. Search for it online, add it to the cart, and let it arrive on your doorstep. Because these labels are exposed to sunlight, rain, water, and so many pollutants every day, we need them to be super sticky.
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