| 摘要 |
RECIPROCAL LABELING OF PACKAGING ENVELOPES A method is provided for reciprocal labeling of thermoplastic packaging bags that includes the steps of advancing a collapsed tubular polymeric film and corona treating its outer surface, advancing a printed web of indefinite length, having printed along one surface thereof a regularly repetitive pattern of reverse-printed reciprocal label sets, and corona treating its printed surface, longitudinally slitting the advancing web between reciprocal prints to form two reciprocal label strips, advancing the label strips oppositely alongside the advancing collapsed film such that the corona treated surfaces of the strips are adjacent opposing sides of the collapsed film respectively and adjusting the registration of printed matter between said label strips, and then directing the strips into bonding contact with the collapsed film. Associated apparatus for carrying out the method is also provided. |
