As bottled water continues to be the leading beverage choice among U.S. consumers, proper plastic bottle labeling becomes increasingly important to build brand loyalty and convey product information. Know what to consider when labeling your plastic bottles to ensure successful adhesion and label performance.
Consideration #1: Surface Energy
Different types of plastic offer different levels of surface energy. Plastics that have a high surface energy, such as PET and PVC, are easier for label adhesives to achieve and maintain a sufficient bond. This is because the adhesive is able to penetrate the entire surface, increasing the available bonding area.
However, other plastics, such as HDPE and PP, offer low surface energy. This causes the adhesive to bead up on top of the surface, reducing the bonding area and making it more difficult to achieve successful adhesion. This can lead to a weak bond or label peeling.
Therefore, it’s important to ensure the plastic bottle’s surface energy matches the chosen adhesive’s bond strength.
Consideration #2: Flexibility
Additionally, certain plastics are softer and more flexible than others. This can impact the label’s adhesion ability, too. When a bottle is very pliable, it makes it difficult to ensure the label can properly bend as it moves without losing its adhesion.
Consider applying the adhesive only at the start and end of the label to help accommodate the plastic bottle’s flexibility levels.
Consideration #3: Texture and Shape
Plastic bottles also offer different textures and shapes, such as ridges and tapers. When a bottle has ridges, it can cause labels to wrinkle when applied. Therefore, it’s a good idea to ensure the adhesive and label avoid where the ridges are located.
Additionally, bottles with a taper can also impact the label’s look and its adhesion abilities. Make sure the label is applied where there is a flat edge or follow the angle of the taper for proper adhesion.
For more insight on plastic bottle labeling best practices and smart adhesives for this application, visit www.bostik.com.