Temperature adhesion

The heat resistance of the adhesive layer is limited. Depending on the basic material of the adhesive, temperatures for continuous stress range between approximately 120 and 300 °C. 

In summary, the stress (typically at the edge of the die) increases with die size, modulus of the adhesive, temperature, difference in expansion coefficients, and increasing bondline thickness." ... 

No fundamental change has been observed in the stmctnre when we modify the adhesion temperature of the glass. 

While uniform speed and quite exact curve-following ability is readily available from manufacturers of robot-type equipment, other factors can influence the uniformity of the applied adhesive bead. As previously noted, adhesive viscosity can vary with temperature. In the case history mentioned above, it was necessary to precondition the supply pails of the adhesive so that the temperature of the material did not change while it was being used. If the operator did not allow the adhesive temperature to stabilize, it was necessary to continually adjust the pumping pressure in order to maintain uniform adhesive flow. 

It is necessary, of course, that tests be made to determine if there is any adverse effect on the adhesive-bonded assembly. This system does have the advantage, as previously noted for some other methods, that adhesive temperatures will not exceed some previously determined level, in this case the boiling point of the liquid. As long as the liquid selected does not have a boiling point above the degradation temperature of the adhesive or the substrates, there is appreciable latitude in the time the materials remain in the vapor. 

Loguercio, A.D. et at (2011) Adhesive temperature effects on adhesive properties and resin-dentin bond strength. Oper. Dent., 36 (3), 293-303. 

The final application depends on the properties of electron beam (EB) laminating adhesives, including web speed, adhesive flow additives, adhesive temperature, coaler configuration and corona treatment. 

The viscosity is the only variable here. The viscosity in turn depends on the temperature. Independent by of the absolute viscosities of the different adhesives, the temperature-dependent change is ca. 5% per degree Celsius. For the dosing plant under consideration with a pneumatically driven piston dosing pump, this means that fluctuations in the adhesive temperature directly cause fluctuations in the discharge rate. A temperature change of 1°C leads to a ca. 5% change in the applied amount of adhesive. 

For hydraulic dosing plants, the dosing pressure can be controlled very precisely via a servo valve in the hydraulic system. If the adhesive temperature is measured and if the hydraulic pressure, and hence the dosing pressure, is adapted to the measured values, then good temperature compensation for the temperature-dependent flow properties of the adhesive can be achieved. 

Electric heaters are generally patch resistive elements mounted to surfaces with conductive adhesive. Temperature sensors near the heaters are required to indicate when supplemental heating is required Control and power supply generally comes from the main space vehicle bus. 

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