| 摘要 |
PURPOSE:To cause a plastic tube to closely adhere on a bottle without intermixing air bubbles by such an arrangement wherein a plastic tube which is fixed around the outer circumference of a glass bottle is caused to tentatively shrink by blowing hot air of relatively low temperature to the drum portion of the bottle first and then to the upper and lower edge portion, and after that the tube is caused to finally shrink by blowing hot air of high temperature to the whole surface of the bottle. CONSTITUTION:For example, an elongated tube 6 of polyvinyl chloride of 50mu in thickness is used and in causing it to contact with the outer circumference of a glass bottle 5, the tube 6 (preferably heated up to 55-65 deg.C) is fixed to the outer circumference of the bottle 5, and it is caused to tentatively shrink by blowing hot air of relatively low temperature (e.g., 120-180 deg.C, preferably 150 deg.C for 1sec) only to the drum portion in the first stage and then to the shoulder and bottom portion while the bottle is being rotated around its axis. After that, the tube is caused to finally shrink by blowing hot air of relatively high temperature (350- 400 deg.C, preferably 350 deg.C for about 2sec) to the whole surface of the bottle in the second stage and the plastic tube is caused to closely adhere to the bottle. |
