User’s dilemma: Case
Insufficient mixing and defoaming by manual mixing and vacuum defoaming machine
Our company develops and commercializes LED phosphor. We mix phosphor with epoxy resin and silicone resin in the sealing process. We used to manually mix them for about ten minutes, and then defoam by using a vacuum defoaming machine.
Manual mixing varied depending on the mixing conditions of workers, so it could not ensure a uniform dispersion of phosphor.
In addition, when defoaming was carried out with a vacuum defoaming machine, the material tended to overflow, so it was necessary to keep an eye on the machine. This was why we had trouble properly removing foam, and the process took time.
We also needed to improve our mixing and defoaming methods because phosphor sedimented or separated in a vacuum defoaming machine, due in part to the low viscosity of resin.