Package making – Methods – Forming a cover adjunct or application of a cover adjunct to...
Reexamination Certificate
1999-06-04
2001-10-09
Lazarus, Ira S. (Department: 3721)
Package making
Methods
Forming a cover adjunct or application of a cover adjunct to...
C053S389400
Reexamination Certificate
active
06298634
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a process for producing a material web (wound) roll that is wrapped on its circumference. A material web is wound into the wound roll and a wrapping (packaging) web or sheet is placed around the circumference of the wound roll. The present invention also relates to an apparatus for producing a wound roll that is wrapped on its circumference, in which the apparatus includes a material web delivery path and a winding device. The present invention also relates to a wound roll, formed by a wound material web, having a circumference enclosed by a wrapping web.
2. Discussion of Background Information
In one of the final production steps, a material web, e.g., a paper web, is wound into a marketable wound roll and subsequently wrapped with a wrapping (packaging) web or sheet. Generally, it is necessary to cut the finished web to certain widths which correspond to the uses for the consumer. That is, while webs are produced with widths of up to approximately 10 m, consumers, such as printing plants, require webs having maximum widths of approximately 3.8 m. In many instances, the rolls to be used by consumers have an even smaller width. Therefore, the finished web having a large width can be unwound from a main roll and guided to pass through a longitudinal cutting device to produce partial webs having the desired widths. The partial webs can then be wound into separate (partial) wound rolls.
When the separate wound rolls have attained a desired diameter, the last layer of the material web is glued to the circumference of the wound roll. The wound rolls are then ejected from the winding device and delivered to a wrapping device. In the wrapping device, the circumference of the wound roll is covered with a wrapping (packaging) web or sheet, e.g., wrapping paper, and the ends of the separate wound rolls are provided with end covers.
The wrapping device generally requires a relatively large amount of space. In many cases, the wrapping device must store a large number of wrapping web rolls of different widths to enable wrapping wound rolls produced with different widths.
SUMMARY OF THE INVENTION
The present invention reduces the amount of space necessary for operating a wrapping device for a wound roll of a material web.
The present invention provides a process in which the wrapping web is attached to the incoming material web and the material web (wound) roll is further rotated.
According to the present invention, the processes of winding and wrapping the circumference of the wound roll are combined in one location, which saves space because, e.g., the supply device for the wrapping web can be kept relatively simple. The supply of the wrapping web to the material web is provided simply by attaching the wrapping web to the material web forming the wound roll. In this manner, the material web pulls the wrapping web along, and, with further rotation of the wound roll, the wrapping web is wound around the circumference of the wound roll. Therefore, the winding device is used not only to wind the wound roll, but to produce the circumference wrapping. The present invention, therefore, has the additional advantage that the wound roll has a certain protection from damage during further handling due to the application of the wrapping web. When the wrapped wound roll is ejected from the winding device, it rolls on its circumference to other handling or transporting devices. Because the circumference is already wrapped with a wrapping web, the risk of damage to the circumference of the wound roll, i.e., the outermost layers of the material web, is reduced. By reducing the risk of damage to the wound roll, the process also reduces the number of rejects at the processor. Moreover, an additional drive mechanism for the wound roll in a separate wrapping device can be eliminated, which saves investment and maintenance costs.
It may be preferable to cut the material web in the longitudinal direction before winding and to attach the wrapping web to the material web before the cutting. In this manner, the wrapping web can also be cut in the longitudinal direction, and precisely to the width of the material web and, therefore, precisely to the width of the wound roll. Thus, the wrapping web ends flush with the end faces of the wound roll. In this manner, the desired effect that the wound roll is covered by the wrapping web on the circumference over its entire axial length is ensured, and the problems generally encountered with respect to handling an axial protrusion is avoided. Moreover, through a relatively simple measure, it is no longer necessary to store a large number of different widths of wrapping webs because the wrapping web is automatically adapted to the width of the wound roll to be wrapped. In addition to the space savings, other advantages are provided by the process of the present invention. For example, with conventional wrapping devices, it was necessary to store various widths of wrapping sheet to accommodate any desired width of wound rolls. However, the wrapping webs that are used can dry out over time, and when these dried out rolls are finally used, they can negatively affect the wrapping process due to their sharply reduced moisture. For example, the tear strength can decrease, the static load can increase, the application of adhesive can become problematic, etc. If the same wrapping web can always be used, i.e., a fresh one, as is proposed by the present invention, then these problems do not occur. Furthermore, the process of the present invention provides a considerable time savings since a number of wound rolls can be circumferentially wrapped at the same time. Thus, the time required to wrap the rolls is reduced significantly in comparison to a process in which the rolls are wrapped chronologically or successively one after the other.
The wrapping web may be preferably attached on its end to the material web. In this particular embodiment, a very stable attachment between the wrapping web and the material web can be produced. In another embodiment, the wrapping web can be used to guide the material web, e.g., to begin a new wound roll.
The wrapping web may be wound together with the material web. In this manner, the outer layers of the wound roll may be several layers of wrapping web and material web which are alternatingly arranged, i.e., in sandwich fashion. This produces a very intimate relationship between the wrapping web and the material web, and keeps the risk of the wound roll shifting axially in the circumference wrapping (i.e.,telescoping) very low.
The material web may be glued to the surface of the wound roll in the vicinity of its attachment to the wrapping web. A second attachment to the wrapping web can occur at the end of the material web. Therefore, two gluing locations may be provided, e.g., one on a radial inside and one on the radial outside of the material web. This not only assures stable attachment of the end of the wrapping web to the circumference of the wound roll, but also assures a stable attachment of the end of the material web to the wound roll.
In an alternative embodiment, the material web may be cut in the travel direction after being attached to the wrapping web. Thus, the end of the wrapping web can be attached to the material web. In this particular embodiment, the circumference wrapping can be practically exclusively formed by the wrapping web, i.e., without interposed material web layers. However, in this embodiment, the material web follows the wrapping web so as to start winding a new material web. In particular, the wrapping web may pull the material web to the wound roll so that renewed threading procedures can be eliminated.
The wrapping web may preferably be attached to the circumference of the wound roll before a new attachment in the travel direction. Thus, the present invention provides that the beginning of a “new” material web can be pulled into the immediate vicinity of the wound roll. When the wrapping web is attached to the “old” wound roll, t
Greenblum & Bernstein P.L.C.
Lazarus Ira S.
Paradiso John
Voith Sulzer Papiertechnik Patent GmbH
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