Pressure Sensitive Liners
Pressure sensitive liners are consist of an EVA-based pressure sensitive adhesive material that is coated on extruded Polystyrene Foam (PE foam seal) and a release coating on the back that does not come in contact with the product inside the bottle or container. It easily sticks to either Plastic (PET, PE, PP, PVC, PS) and glass bottles/containers, so you can apply them with ease. They firmly glue to the bottle when the cap will remove. self-adhesive liner is often seen as a cost effective option for that kinds of products that requires seal liner as it does not require any machine or equipment to be applied. However, packagers must consider some important items when utilizing pressure sensitive liners. Here we have mentioned the most important 3 items:
Let them at least 24 hrs to stick securely
Pressure sensitive liners are coated with a torque activated coating. Once the cap is applied, it should not be removed for at least 24 hours to ensure proper adhesion.
Use them only with powder or dry products
Self-adhesive liners work well with dry products, and it is not recommended apply them on liquid products. Moreover, the application area must be completely dry or the liner will fail to stick to the bottle opening. Pharmaceuticals, Cosmetics, Spices and other dry products bottles are proper candidate for being sealed with self-adhesive liners.
Just for products with no more than 6 months shelf life
It is a very critical issue for manufacturers to consider. After 6 months shelf life, the liner’s adhesive coating may start to lose its potency and gradually the sealing may break easily. This is why we do recommend our clients to not to use them on products with more than 6 months shelf life. Make sure you manage the products storage to ensure optimal performance of your sealing liners.
Producers must store caps and liners in temperature between 16 to 27 C, with a relative humidity 40 to 60%. It is very important to keep bottles from direct sunlight exposure.