Adhesive hotmelts are compounds of polymers, resins, waxes, oils, stabilizers and antioxidants, but always 100% solid. To apply hotmelts, it is needed to head them up to the right temperature vs. viscosity. Due to the different formulations different temperature setups are used, but always to reach the right viscosity. The viscosity of hotmelts is strongly related to the temperature. To head up means the solids (room temperature) are getting warm and pasty (approx. 100°C) up to the liquid stage (approx. 160°C ? 180°C). To realise a good bonding, the substrates needs to be pressed during the liquid stage, the pressing should take as long as the hotmelt is cooled down to less than 100°C. The real bond strength should be tested not earlier than 24 h after application, the hotmelt will be ?cured?, this will give reproducible results.
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