Winding – tensioning – or guiding – Convolute winding of material – With particular drive
Patent
1996-11-21
1998-06-02
Walsh, Donald P.
Winding, tensioning, or guiding
Convolute winding of material
With particular drive
2425415, 242547, B65H 1814
Patent
active
057588422
DESCRIPTION:
BRIEF SUMMARY
The invention pertains to a winding machine for winding webs, preferably paper webs, that may be longitudinally slit, wherein the first support roll (TW1), as seen by the web traveling in the machine direction, has a higher total load during the winding process, the total load resulting from both the static and dynamic loads, and has a jacket (M1) which can undergo greater elastic deformation than can the jacket (M2) of the second support roll (TW2).
In order to achieve the most uniform winding result possible, i.e., the most uniform roll structure possible, and to minimize winding flaws as the weight of the roll being produced continues to increase, it is known to provide at least one of the preferably two support rolls with an elastically deformable jacket. The possible combinations are described in DE 92 04 667 U. According to this publication, the best winding results are achieved if the following combination of characteristics is realized in such a support roll arrangement: direction in which the paper web is traveling) has a jacket that can deform significantly more than the jacket of the first support roll as seen from the machine direction, relative to the first support roll as seen from the machine direction such that a plane extending through the axes of both support rolls forms an angle with the horizontal.
It was determined that this known support roll arrangement rarely provides truly satisfactory winding results.
Consequently, the invention is based on the objective of improving a winding machine of the initially mentioned type in such a way that the roll quality is optimized, even at higher roll weights.
This objective is realized with a winding machine according to the characteristics of partially wrapping the web about the first support roll, as seen coming from the machine direction, and providing the first support roll with a jacket, or cover, which can undergo greater elastomeric deformation than that of the cover of the second support roll.
The invention for the first time recognizes that the dynamic support roll load during the winding process must be taken into consideration when determining the elasticity or rigidity of the support roll surface. It was demonstrated that the total load resulting from both the dynamic and the static load of the support roll, around which the web is partially wrapped, i.e., the first support roll as seen from the machine direction, is always relatively higher than that of the other support roll.
One additional, significant improvement in the winding result can be achieved if the second support roll as seen from the machine direction has a higher coefficient of friction .mu. than the corresponding surface of the first support roll as seen from the machine direction within the region of the respective support roll surfaces that contact the web. If this measure is realized in combination having the first support roll, as seen coming from the machine direction, provided with a jacket which can undergo greater elastic deformation, and which first support roll is also partially wrapped by the oncoming web, the tension of the paper web can be optimally adjusted or predetermined on the outer roll surface. According to one preferred embodiment, the weight load of the second support roll as seen from the machine direction is particularly small in comparison to the weight load of the first support roll as seen from the machine direction.
One additional embodiment of the invention is characterized by the fact that the space limited by the support rolls and the resulting partial roll is charged with a gas pressure via the gap formed between the support rolls such that the inherent weight of the roll is relieved. Naturally, the end surfaces of the space that is charged with the gas pressure must be suitably sealed in order to build up the relief pressure. This so-called air lift has been known for quite some time in two-drum winding machines with relatively inelastic support roll surfaces from U.S. Pat. No. 3,346,209 by the applicant, as well as U.S. Pat. No. 3,497,
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Deeg Rudi F.
Dorfel Gerhard W.
Beloit Technologies Inc.
Campbell Raymond W.
Mathews Gerald A.
Rivera William A.
Veneman Dirk J.
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