[ Problem Point ]
There is no good method of heat the small printed circuit board and We were in trouble.
[ ⇒Kaizen Point ]
The ring heater which can carry out uniform heating of the wide area was introduced.
The efficiency of preheating increased.

There is no good method of heat the small printed circuit board and We were in trouble.
The ring heater which can carry out uniform heating of the wide area was introduced.
The efficiency of preheating increased.