Winding – tensioning – or guiding – Unwinding – With attachment to preceding material
Reexamination Certificate
1999-07-02
2003-10-28
Zirker, Daniel (Department: 1771)
Winding, tensioning, or guiding
Unwinding
With attachment to preceding material
C242S556000, C428S354000, C428S040100
Reexamination Certificate
active
06637697
ABSTRACT:
The invention relates to an adhesive tape for the flying splice (flying roll change) in paper finishing machines, rotary printing machines and the like, and to its use accordingly.
Flying splice in papermaking factories or the like is a common technique for replacing an old, almost fully unwound roll of paper by a new roll without having to stop the machines, which run at high speed. This is done using double-sided self-adhesive tapes, known as splicing tapes, which firstly are of high adhesion and high tack but secondly, because of their water-soluble self-adhesive compositions and paper backings, do not interfere with the re-use of paper wastes in the papermaking machine. These splicing tapes are bonded artistically in a zigzag form to the beginning of the web, a procedure requiring experienced personnel, with only about 4-13 minutes remaining for the entire procedure, depending on the working width and form of splice, owing to the high speed of the machines.
Although this technology is well established, it is not without certain disadvantages. Thus experienced personnel are required, the procedure is intrinsically hectic, and the bonds are also relatively thick, since in each case two plies of paper and the adhesive splicing tape in between are the result: a result which is unwanted in the paper industry.
There are various products on the market, known as splicing tapes, for this “butt splicing” in flying splice, which in addition to a paper backing comprise a water-soluble self-adhesive composition coated on both sides. Adhesive tapes of this kind are marketed inter alia under the name tesafix (Beiersdorf).
Also known from EP 418 527 A2 is a method of preparing a roll of printed web material in a roll changer of a rotary printing machine, in which use is made of adhesive strips that are divided into three zones (column 3, line 12 et seq. and FIGS. 1 and 2), the middle zone 6 being perforated. Tearing then takes place at this perforation (column 3, line 35).
Furthermore, DE 40 33 900 A1 discloses an adhesive tape which is suitable for an abovementioned splice and which has greatly differing bond strengths on opposing sides, so that it adheres preferentially to the drum in the course of tearing off (cf. column 2 line 17 et seq.).
In practice, however, such adhesive tapes have serious disadvantages, especially as a result of adhesive areas present following the splice.
However, DE 196 28 317 A1 has already disclosed an adhesive tape for such applications, in which following the splice there are no longer any adhesive surfaces by virtue of the fact that in that case use is made of a readily splicing paper backing
7
which splits on splicing and following the splice masks the adhesive compositions
8
and
9
; cf. FIG.
3
. DE 196 32 689 A1 also discloses a similar adhesive tape for this application, although in this case a readily splicing paper backing is employed which splits over the entire width of the adhesive tape; cf. in particular FIG.
3
.
Nevertheless, even adhesive tapes of this kind have their disadvantages. When an adhesive tape according to DE 196 28 317 is applied it is found problematic that the end of one roll of paper (referred to as 11 in FIG. 2) retains play because the adhesive tape with its self-adhesive composition
9
is either not yet bonded to the underlying paper web, or the adhesive tape, initially bonded to the lower web, is not yet bonded with the uppermost web, or else, even after complete bonding has taken place, the tape can still easily lift off out from the lower web and in doing so may damage the readily splicing paper backing
7
before the actual splice is attached. In the case of an adhesive tape in accordance with DE 196 32 681, a weak point is evident in particular at the point where, following the splice, the old and the new webs are joined (roughly in the left-hand third of FIG.
3
); at this point, it is then easy for a tear to appear, and the splice is therefore unsuccessful.
The object of the invention was to remedy this situation and, in particular, to avoid the disadvantages of the prior art or at least to alleviate them in a manner sufficient for practical purposes.
The invention accordingly provides an adhesive tape as characterized in more detail in the claims. Advantageous embodiments are indicated in the subclaims.
With the adhesive tape of the invention, outstanding splice results are obtained and, in particular, a considerable improvement is achieved over a tape according to DE 196 28 317. That both the treatment of a roll of paper for splicing, and the splice itself, could be significantly facilitated, or improved, by changing the known adhesive tape by placing readily splicing strips of a splicing tape at both rearside edge regions could not have been derived from the prior art.
The invention additionally provides a method using adhesive tapes of this kind, namely a method of flying splice in a paper finishing machine or the like, using an adhesive tape having a paper backing and a water-soluble self-adhesive composition, characterized in that an adhesive tape according to one of the claims is employed and is bonded to the back of part of the topmost web of a new roll of paper, while the double-sided adhesive tapes located on the reverse face of the adhesive tape in turn bond with the underlying web of paper and thus secure the topmost web of paper, whereupon the new roll of paper is placed adjacent to an almost fully unwound old roll of paper that is to be replaced and is accelerated to the same speed as the old roll, and then is pressed against it so that the exposed self-adhesive composition of the adhesive tape bonds with the paper web of the old roll when the webs of paper are at essentially the same speeds, while at the same time the readily splicing paper backings splice in such a way that the self-adhesive compositions with which they were coated are masked non-adhesively by the remains of the said backings, as is depicted in FIG.
3
.
In the context of this method it is preferred that first of all only the smaller portion of the slitted liner is peeled away and the adhesive tape is bonded with the exposed portion of the self-adhesive composition behind the topmost web of a new roll of portion, while the larger portion of the liner is not peeled away until shortly before its use for the flying splice.
In practice this enables a single person to prepare and carry out the splicing of a roll of paper 8 m wide, The “flag” of the new roll can, for example, be turned back, i.e. the topmost web of paper is turned upwards. Then an adhesive tape of the invention is bonded to the underlying web, transversely or, in particular, diagonally, with its two strips of a double-sided adhesive tape, while the upper self-adhesive composition is advantageously lined with a release paper. Then in particular the upper region of the release paper is peeled away and the “flag” is placed back over the adhesive tape and stuck down. The projecting portion of the “flag” can then be folded over and separated so that a portion of the adhesive tape is exposed. If desired, the remainder of the release paper is removed and the roll is ready for the splice.
In accordance with the invention, the paper industry is enabled to depart from the butt splicing technique used to date without giving up its advantages. Furthermore, a roll of adhesive tape offered to the user can be given a significantly more uniform configuration, in particular with no tendency towards telescoping. In addition, larger rolls can be made without problems and handled.
On technical grounds and also for reasons of rationalization it is desirable to depart from the known technique of butt splicing with double-sided reprocessible adhesive (splicing) tape in the course of automatic roll changing on coating units. It is now possible to switch to a single-sided, reprocessible adhesive tape, with considerable advantages.
In this bonding technique with an adhesive tape of the invention, an advantageous procedure is to bond the underside of the topmost paper ply (untreated paper) with
Norris & McLaughlin & Marcus
tesa AG
Zirker Daniel
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