Winding – tensioning – or guiding – Convolute winding of material – Pressure element against coil
Patent
1996-05-28
1998-07-14
Nguyen, John Q.
Winding, tensioning, or guiding
Convolute winding of material
Pressure element against coil
242541, 2425423, B65H 1826, B65H 1814
Patent
active
057791830
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a method for finishing the surface layers of the machine reel that is formed during reeling of the web.
The invention also concerns a device for finishing the surface layers of the machine reel that is formed during reeling of the web.
When a full machine reel is separated from the face of the reeling drum, there is no nip contact any longer. Then, air readily penetrates into the machine reel through the gap between the full machine reel and the arriving web, which produces deterioration of the quality of the machine reel. Since air has access between the layers, the layers become slack. Such a drawback of waste layers is relatively extensive and equals up to about 500 metres of web that is reeled. When a full machine reel is stopped, the slack surface layers can move to either side.
At present, attempts are made to prevent the drawbacks described above so that, in connection with change of reel, reeling without a nip is not employed. At present, the properties of the web permit utilization of the web tension. However, the risk of web break in connection with reel change is increased considerably, so that this technique is not optimal either.
SUMMARY
The object of the invention is to provide a method and a device by whose means the drawbacks present in the prior-art solutions are avoided.
The method in accordance with the invention is characterized in that, in the method, is being completed before the reel that is being completed is transferred to the reel change position, member that presses the web during nip-free reeling forms a contact with the web, which contact prevents access of air between the web layers, and follows the full reel during its transfer to the reel change position, and that presses the web is shifted apart from the face of the reel that is being completed along such a path of movement that the member that presses the web maintains a contact of the desired extent with the face of the reel that is being completed.
On the other hand, the device in accordance with the invention is characterized in that the device comprises a member that presses the web and that is brought onto the face of the reel that is being completed before the reel that is completed is transferred to the reel change position, that the member that presses the web is fitted to form a contact with the web, which contact prevents access of air between the web layers, when the full reel is transferred to the reel change position, that said member that presses the web is fitted to follow the full reel during its transfer to the reel change position, and that the member that presses the web is provided with actuators which are fitted to shift the member that presses the web during the reeling of the finishing surface layers apart from the face of the reel that is being completed along such a path of movement that the member that presses the web is fitted to maintain a contact of the desired extent with the face of the reel that is being completed.
In the solution in accordance with the invention, in the final stage of the reeling, nip-free reeling and a member that presses the web are employed. The member that presses the web prevents access of air between the web layers. Then, the result is a highly carefully finished face of the machine reel. As the member that presses the web, it is preferable to use a brush device. Also, a fragmentary roll and a spreader bar are some further preferred alternative embodiments of the member that presses the web. Owing to the solution in accordance with the present invention, in practice, no waste of web is produced, because of which the solution in accordance with the invention is also economically a significant improvement over prior-art solutions.
The invention will be described in detail with reference to a preferred embodiment of the invention shown in the figures in the accompanying drawing, to which embodiment alone the invention is, however, not supposed to be confined.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a side view
REFERENCES:
patent: 4491283 (1985-01-01), Pav et al.
patent: 4832274 (1989-05-01), Hawkins
patent: 4854517 (1989-08-01), Watanabe et al.
Aalto Esa
Kyytsonen Markku
Mannio Aaron
Mikkonen Silvo
Nguyen John Q.
Valmet Corporation
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