| 摘要 |
A method and apparatus for wrapping a film having an elasticity sufficient to stretch without bursting about four sides of an object, in which the object is moved into a loop of the film between two supply rollers and the film is fed from the supply rollers at a rate such that the film is stretched adjacent the fourth side of the object are then brought together and clamped along a first line while the film is still under tension. The tension on the portions of film brought together is then released. Thereafter, the portions of the film adjacent the fourth side of the object are again clamped along a line parallel to the first line of clamping. The portions of film are then welded along a line parallel to and between the two lines of clamping, and the film is then cut within the weld.
|
