MANUFACTURE OF PLASTIC SLEEVE AND ITS DEVICE

摘要

PURPOSE:To constitute the titled device so that a fused part of an overlapped part of a plastic sleeve is peeled off extremely easily and the plastic sleeve is pulled out through a mandrel body extremely easily, by enabling to make a pressing-in bar go-in and-out a pressing groove on the circumferential surface of the mandrel body and to press a holding plate against a shoulder part of the pressing groove on a remote side from a heat seal plate. CONSTITUTION:After an operation that a blank 10 has been formed by cutting off a plastic web 1 wound round a roll 2 in a predetermined length, the blank 10 has been wound round the external circumferential surface of a mandrell 11 provided with a pressing groove in an axial line direction on the circumferential surface so as to constitute the blank that end parts of the same are piled up each other and the above blank has been sucked and held on the whole circumferential surface of the mandrel 11, a plastic sleeve 12 is formed by performing heat welding by pressing a welder seam bar 13 against a tiered part of the above blank. Then simultaneously with pressing of a plastic film against the circumferential surface of the mandrel by releasing a vacuum sucking action of the above mandrel 11 and making use of a holding plate 26 a pressing-in bar 25 is pressed in the above pressing groove 24 and the plastic sleeve on the mandrel is pushed up along the mandrel after the fused part between the tiered part of the plastic sleeve 12 and the mandrell 11 has been peeled off.