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They are used for different uses such as: health and hygiene products, adhesive tapes or labels of all kinds.
Initial adhesion: This is the immediate adhesion of the label when it comes into contact with the substrate. A label with a high initial adhesion will quickly attach to the substrate. A low
initial tack label will have a low level of adhesion when first applied and can be removed cleanly.
Final Adhesion: It is the adhesion ﬁnal or maximum that the label will reach when the adhesive penetrates into the substrate. The time required to achieve adhesion ﬁnal may depend on the shear of the adhesive, the roughness of the substrate and the ambient temperature. Settling time may vary from 2 to 24 hours, depending on conditions. Initial accession and ﬁnal accession are not necessarily related.
Shear Strength: A measure of the internal cohesion strength of the adhesive. The shear of the adhesive is an indication of the softness of an adhesive. A low (soft) shear adhesive has a
greater tendency to ﬂujo (resulting in higher initial adhesion) and has a greater likelihood of
the adhesive separating under tension. A high shear adhesive (ﬁrme) has a lower probability of separating under tension due to its high internal cohesion strength, and will have a lower
probability of ﬂuir (possibly lower initial adhesion).
One of the keys to the success of pressure sensitive adhesives is that they manage to maintain the balance between adhesion and cohesion. In other words, it sticks to the substrate quickly by simply applying pressure and effectively penetrates the pores of the substrate in such a way that adhesion is permanently maintained.
Hot Melt PSAs are used on all types of surfaces exposed to different conditions. Therefore, one of the characteristics that we cannot overlook is the resistance to ultraviolet rays of the pressure sensitive glue.
Within the Hot Melt PSA we differentiate different types according to the use to which it is going to be destined. In this way, each pressure-sensitive adhesive acquires its own specific characteristics.
One of the applications of the PSA glue are the labels, in any field, from food and beverages to massage or logistics. .
The own characteristics of this type of industrial glue are:
Great adhesiveness to different substrates.
Adhesive tapes are one of the protagonists in the use of Hot Melt PSA. The features that make this possible are:
This pressure sensitive adhesive is particularly delicate as they have direct or indirect contact with the skin.
The characteristics that pressure sensitive adhesives in this category must have are: