Winding – tensioning – or guiding – Convolute winding of material – With cutting – perforating – or notching
Patent
1998-04-20
2000-04-18
Walsh, Donald P.
Winding, tensioning, or guiding
Convolute winding of material
With cutting, perforating, or notching
2425412, B65H 3508
Patent
active
060505192
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an automatic surface rewinder for the formation of rolls or logs of web material. Rewinders of this type are commonly used for the production of rolls or logs of paper which are subsequently cut to produce smaller rolls of toilet paper, kitchen towels and similar.
BACKGROUND ART
There are many known types of rewinders, based on the principle of surface winding, for the production of rolls or logs of web material. Some examples of these automatic surface rewinders (in other words, those in which the logs are formed automatically in rapid succession and the log in formation is rotated by contact with an external system of belts or rollers) are described in U.S. Pat. No. 4,723,724, U.S. Pat. No. 4,856,725, U.S. Pat. No. 4,828,195, U.S. Pat. No. 4,962,897, U.S. Pat. No. 4,487,377, U.S. Pat. No. 4,931,130, U.S. Pat. No. 5,137,225, U.S. Pat. No. 5,248,106, U.S. Pat. No. 5,368,252, GB-A-2.105.688, WO-A-9421545.
Some of these rewinders, for example those described in EP-A-0 580 561 and EP-A-0 611 723 also produce logs without central winding cores.
These rewinders produce a high number of rolls per unit of time, and these are subsequently discharged to the exterior of the rewinder and are collected in a sorter or in an intermediate storage receiver. Before it is possible to proceed to the cutting of each log into smaller rolls and the subsequent packaging, it is necessary to glue the free tail edge of the web material wound on each log to prevent the unwinding of the end portion from causing problems in the subsequent phases, particularly in the packaging.
For this purpose, the logs discharged from the rewinder and collected in the accumulators or sorters following the machine are conveyed individually to a separate and subsequent section of the "converting" line in which one or more machines are provided for the gluing of the free tail edge of the material of each roll, these machines being commonly called tail sealers.
Examples of tail sealers are described in U.S. Pat. No. 3,044,532, U.S. Pat. No. 4,475,974, U.S. Pat. No. 4,963,223, U.S. Pat. No. 5,242,525, EP-B-0 481 929, WO-A-9515903, WO-A-9515902.
All the tail sealers have a station in which the free tail edge of the web material is unwound and positioned before the adhesive is applied.
The necessity of having a rewinder, an intermediate accumulator or sorter and a tail sealer (which in turn comprises a station for the unwinding and positioning of the free tail edge to be glued and a gluing station), causes the line to have large overall dimensions and makes it necessary to synchronize the different sections of the line with each other, resulting in high costs in respect of programming and control systems. These costs are accepted in plants with high output, of the order of more than 9-10 logs per minute, but cannot always be borne with lower outputs.
The present invention is based on the idea of combining the winding and gluing of the free tail edge of the log in a single section of the processing line, thus eliminating not only the intermediate accumulator or receiver, but also the station for the unwinding and positioning of the free tail edge of the log.
Essentially, according to the invention, the log is caused to be discharged as soon as it is formed from the winding cradle of the rewinder, with the tail edge unwound, directly onto a discharge surface along which the adhesive is applied to the roll to close the free tail edge during the rolling of the log on the discharge surface. The length of the free edge and the position of the adhesive on the roll are selected in such a way that as it is rewound the edge covers the line of adhesive and extends beyond it by a few millimeters, forming a tab that can be picked up. In this way the dimensions of the processing line are reduced drastically and also the programming and operation of the line are considerably simplified.
In practice, the method of winding according to the invention may comprise the phases of: tail edge of the said web material unwound fr
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Fabio Perini S.p.A.
Rivera William A.
Walsh Donald P.
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