Vibrating method for charging powder

A powder coating method in which powder is charged by contact between the powder and an electrification member, said method comprising:

• delivering powder through a powder delivery tube, said powder delivery tube comprising said electrification member;
• vibrating the powder delivered within said delivery tube and/or vibrating said electrification member to thereby accelerate contact between the powder and said electrification member to charge the powder;
• detecting an amount of charge of the charged powder;
• controlling the amplitude and/or frequency of vibration so that the detected amount of charge is kept at a first predetermined value;
• and
• spraying said charged powder to an article to be coated.

A powder coating method in which powder is charged by contact between the powder and an electrification member, said method comprising:

• fluidizing coating powder on a bottom portion of a booth;
• extracting the fluidized coating powder;
• delivering said extracted coating powder through a powder delivery tube, said powder delivery tube comprising said electrification member;
• vibrating the powder delivered within said delivery tube and/or vibrating said electrification member to thereby accelerate contact between the powder and said electrification member to charge the powder;
• detecting an amount of charge of the charged powder;
• controlling the amplitude and/or frequency of vibration so that the detected amount of charge is kept at a first predetermined value;
• introducing an article to be coated into said booth;
• and
• spraying the charged coating powder into said booth towards said article from a top portion of said booth.