| 摘要 |
In a wrapped film package, particularly sheets of X-ray film, produced by the method of USP 3,411,263 in which the margins of one web of wrapping material are folded inwardly over the edge margins of a narrower web of wrapping paper with the film sheets sandwiched in between at spaced intervals, the contacting web portions are adhered together and the webs are sealed along lines between adjacent sheets and cut to produce individually wrapped film sheets, the inherent tendency of the folded over web marginal portions to unfold and draw air into the partially wrapped package is overcome by mechanically creasing the folded web edge to set the web in its folded condition and overcome the natural resiliency of the web. Preferably, each web fold edge is creased along two closely spaced parallel lines spaced apart approximately the thickness of the wrapped film sheet so as to impart to the folded edge a generally square cornered configuration. |
