| 摘要 |
1,128,662. Mould labelling plastic articles. UNION CARBIDE CORP. 19 Oct., 1965, No. 44291/65. Heading B5A. A labelled moulded article, e.g. a blow moulded container, is produced by applying a charge of static electricity to the surface of a label and placing it against the wall of an empty mould cavity, introducing a heated thermoplastic material into the mould, forming the said article therein, and removing the article with the label adhered thereto. A patterned label is fed from a roll 12 to a back-up member 20 at which position the label is severed from the roll. The member has one or more wire probes connected to a high potential which charge the label, and passages therethrough from which compressed gas is ejected to blow the charged label on to a carrier head 22 which reciprocates between the member and a blow mould 14. An additional label is similarly charged and fed to a second carrier head so that each mould half receives a label. Each carrier head is perforated and its interior connected to both a compressed gas and a vacuum source; the latter to retain the label and the former to deliver it to the mould wall to which it adheres. The feed of the individual labels to the member 20 may be controlled by a photoelectric cell (18), Fig. 2 (not shown), and before reaching that member each label may be cut to shape by a trimming knife (28) and a backing plate (29). The label may comprise a film of ethylene, propylene, styrene or cellulosic polymer and the printing thereon may be on that surface which is to be fused to the container. Label texturing steps can be employed prior to the insertion of the label into the mould. The printed surface may be coated with an olefin polymer wax which has been reacted with a carboxylic reagent. Various constructions of carrier heads and label back-up members are described. The high voltage wire probes may be carried by the carrier heads. |
