| 摘要 |
<p>A machine is set forth for forming a sleeve of shrinkable, cellular polymeric material from a predecorated web. The machine includes providing a web of material of predetermined width, the web being advanced by a feed drum which is rotated on a vertical shaft with a vacuum means on the drum for holding the web thereon. The feed drum shaft for driving the drum has means for providing at the surface a velocity greater than the web velocity, the vacuum means providing a switch clutch effect for maintaining the web length in tension. A rotary knife is provided which is engageable with the web on the drum for cutting the sleeve blank from the web. A mandrel turret machine is provided which has a circular array of rotatable mandrels, each mandrel being mounted on a rotatable vertical shaft with the turret being rotatable about a vertical axis and whereby the surface of the mandrel is moved successfully in tangential proximity to the surface of the feed drum at a transfer station. Means are provided at the transfer station for rotating the mandrel through a winding cycle in excess of one revolution with vacuum means being provided on each mandrel for engaging a leading end of a sleeve blank on the feed drum and transferring it to the mandrel, the sleeve blank being wrapped around the mandrel in the winding cycle overlapping the trailing end of the leading end thereof. A heat sealing device is provided on the turret individual to each mandrel for applying hot air onto the adjacent surfaces of the overlapping leading and trailing edges of the blank sufficient to join the overlapping surfaces and to form a seamed sleeve. Stripping means is provided on the mandrel which at least partially encircles the mandrel and operated in response to the rotary movement of the turret beyond the sealing station for axially stripping the sleeve downwardly from the mandrel to produce a sleeve. The sleeves so produced are useful for overlying the neck of a closure to provide a pre-decorated label which provides a pilferproof seal.</p> |
