I need to find some costumers, such as companies or factories who buy juice concentrate in Japan. I try to find the website of some of the beverage factories but there is no way to contact them. Anybody can help me please. How to start?
In case if I could find their email address is it ok if I send some emails? How should I write the emails? I m a beginner. Your kind help is really appreciated.

Sincerely,