Design of Adhesive Joints Under Humid Conditions by Lucas F. M. Silva & Chiaki Sato
Author:Lucas F. M. Silva & Chiaki Sato
Language: eng
Format: epub
Publisher: Springer Berlin Heidelberg, Berlin, Heidelberg
Methods to Prepare Specimens of One Part Type Adhesives
The specimen making procedure for one part type adhesives is similar to that of two part type adhesives except for the mixing process. If a one part type adhesive is provided with a syringe, the adhesive can be injected directly into a closed mould with a gun-type applicator. Since almost all one part type adhesives need to be cured at high temperature, some of them have a quite high viscosity at room temperature in order to prevent the adhesive from flow from the joints during the curing process at high temperature. Therefore, a quite high force should be applied to the gun-type applicator in this case. One of the recommendable methods for this situation is pre-heating of the adhesive by heating the syringe in a temperature chamber in advance of its application. Another method is to use pneumatic applicators. For instance, the author has been using the gun-type pneumatic applicators shown in Fig. 6, which has a electric heater to keep the temperature of the syringe inside high.
Fig. 6Injection of adhesive resin into moulds (Left: A mould and a pneumatic applicator with an electric heater, Right: specimen of cured adhesive in moulds)
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