Hot melt coating
Hot melt coatings can be applied on various materials, from paper, foil, to stiff building materials and nonwovens. Most hot melt coatings are pressure senstive. These are sticky coatings at room temperature. At hot temperatuers, between 140 and 200 degrees Celcius, these hot melts art fluid and sticky.
Self adhesive, Pressure sensitive coatings are mostly applied to self adhesive tapes and self adhesive labels. Both have a large application area in the packaging, and foodpacking industry, but also in the manufacturing industry where goods have to be shipped, packed and identified.
Besides pressure sensitive coatings with PSA hot melts, there are also non-pressure sensitive heat seal coatings. These can be used in various areas as well, such as heat-seal labels and heat seal textiles.
Pressure sensitive adhesives are mostly build from
-a polymer, to make it cohesive
-a resin to make it sticky
-an oil or wax to make it lower viscos, or even more stick.
Besides these main ingredients, we are able to add stabilizers, tackifiers, colours, etc.
An example of some physical properties of PSA coatings you find below:
180° Peel adhesion to steel (FTM 1)
after 20 min: 10 – 100 N/inch
Loop Tack on glass (FTM 9)
9– 99N/inch
Rolling Ball (PSTC 6)
approx. 0,8-88,0 cm
Shear adhesion to steel (FTM 8)
40 °C: > 24 h with 1 kg/inch²
Shear adhesion failure temperature on steel (SAFT)
110°C