| 摘要 |
Forming electric field in and out of the vertical overlap portion, bottom peripheral joint portion and top peripheral rolled portion of a paper cup made of paper or like material lined with a laminate, supplying charged powder particles in the space of said formed electric field to effect powder coating on said portions and with subsequent heat treatment, sealing layers are formed on said portions to become water tight; providing outside electrodes at the outside of said vertical overlap portion and folded portions and providing opposed electrodes in the inside of the paper container, providing a powder supplying means for blowing powder to said sealed portions and masking means for masking the portions not powder coated to securely seal said vertical overlap portion and folded portions. |
