Splice and process for making a splice on the leader of a paper roll

For making a web connection, an adhesive tape is used which essentially features on only one side an adhesive layer. The cover foil of this adhesive layer is comprised of two parts that are separated by a longitudinal seam. Applied on the other side of the substrate of the adhesive layer is at least one narrow adhesive strip, also having a cover foil, which preferably is contained on an edge of the adhesive tape.

BACKGROUND OF THE INVENTION 
The invention concerns a splice or the leader of a paper roll, and a 
process for making such a splice. Adhesive tapes have been utilized which 
on one side feature the adhesive layer, or adhesive layers, for taping the 
end of the old web and the leader of the new roll. Part of this adhesive 
layer is glued underneath the start of the new paper roll. 
There is a prior process for making seam splices on running webs, on 
unwinding devices, for instance for coaters, where a double-sided adhesive 
tape is applied on the end of the web wound into a paper roll. Once the 
web and has then been fixed on the paper roll, the second cover foil of 
the adhesive tape is removed so that when pushing down on the old web 
passing the paper roll the ends of the webs are being spliced. The 
disadvantage encountered is that in the following coater, for instance on 
a blade serving as a doctor element for the coating mixture, the front end 
of the joined paper web causes a heavy jolt on the blade. Furthermore, a 
certain, although small, sump of coating mixture also is created at this 
point, tending to contaminate subsequent rolls, reversing rollers etc. 
The problem underlying the invention is to propose a splice and an adhesive 
tape which makes it possible to make a web splice without the 
aforementioned disadvantages, where specifically only a slight jolt and a 
low joint edge of the web are supposed to be given at a future splicing of 
the running web(s). 
SUMMARY OF THE INVENTION 
This problem is inventionally solved through the features of the present 
invention. An adhesive tape features on its backside as well an adhesive 
layer, which as the case may be, may be strip-shaped or dot-shaped, or at 
least a double-stick adhesive strip, by means of which it is glued, with 
the outermost winding taut, on the latter or on the paper roll, at the end 
of the outermost roll winding. 
A favorable process for making a splice at the leader of a paper roll using 
adhesive tapes of the present invention is characterized by the following 
features: (a) the web leader is kept distant from the paper roll, for 
instance by forming a loop which is temporarily fixed on the paper roll at 
the edge of the leader; (b) the adhesive tape is applied either on the 
loop, after removal of a cover foil, with the adhesive layer corresponding 
to the cover foil, or the adhesive tape is applied on a spot of the paper 
roll exposed through the removal of the web leader, with the adhesive 
layer of the adhesive strips or corresponding adhesive films, as well 
parallel to the axis of the paper roll; (c) facultatively upon elimination 
of the loop or removal of the cover foil closer to the exposure spot of 
the web leader from the paper roll, the paper roll and web leader are 
taped together while the web is wound taut; and (d) the overhang tail of 
the web leader, at the joint of the removed cover foil toward the 
remaining cover foil of the one web side, is detached, preferably by 
tearing it off by hand. 
A favorable device for making a splice is also described. A device, 
specifically a paper roll carriage provided with it, is provided for 
application of an adhesive tape on the web leader of a paper roll or on 
the paper roll parallel to its center. A guide rail extending parallel to 
the paper roll is provided, having a guideway for a cassette or unwinding 
device containing the adhesive tape roll.

DESCRIPTION OF THE PREFERRED EMBODIMENT 
In FIGS. 1 and 4 through 6, the adhesive layer is indicated by dashed line. 
Corresponding or similar components, for instance cover foils, are 
signified in the various drawings using the same reference symbols, but 
with a varying number of prime signs. 
FIG. 1 shows the adhesive tape 1 consisting of the backing 2 for the 
adhesive layer 3, and the cover foils 4 and 5 separated from each other by 
a longitudinal seam 9 and adhering to the adhesive layer 3. The further, 
narrow, double-stick adhesive strip (also adhesive tape) 7 with another 
cover foil 8 is also shown. The adhesive strip 7 may also be substituted 
by a number of adhesive dots or adhesive areas. 
The adhesive force of the adhesive layer of the adhesive strip 7 contained 
underneath the cover foil 8 is considerably greater than the adhesive 
force of the adhesive layer on the other side of this adhesive strip 7. 
The adhesive tape on the web end C of the paper roll being fastened, 
according to FIG. 2, by means of and on this adhesive strip, the adhesive 
strip adheres more so to the paper roll, and not to the adhesive tape 1, 
as the web end is torn off due to the traction of the old web in splicing 
the two webs. This keeps the thickness of the joint at the doctor element 
(coating blade S) of FIG. 3 low. Hence, also only a very slight amount of 
coating mixture can accumulate at the joint. 
The adhesion of the adhesive strips 6, 7 (or 10), each of which may also be 
a sole adhesive layer, will preferably be made less on the side facing the 
adhesive tape 2, etc., than on the other side. To that end, the adhesive 
surfaces on both sides may be varied in size, with equal adhesion on both 
sides. 
The adhesive strip 7 (also 6, 10, in FIG. 4; 11, in FIG. 5) follows the 
splice at the distance of a paper roll circumference and thus, as the case 
may be, can remote paper web remnants that may have remained back on the 
doctor element and are created as the old paper web is pulled off its 
core, which is very important for the quality of the applied coating. 
Adhesive strip 7 (or 6, 10, etc.) extends parallel to the longitudinal web 
edges L, M. 
The "end" C of the paper web, naturally, is here the "leader" of the paper 
roll A. 
Illustrated in FIG. 2 is the condition where the adhesive tape 1, for one, 
is tacked onto the paper web end C of the paper roll A, and at that, on 
the side facing toward the interior of the paper roll and, for another, on 
the outward-facing side B of the same lap of the paper web. This may be 
accomplished by, e.g., manually flapping the end of the paper web C back 
into the dashed position (loop G), in which this end is temporarily 
fastened on the paper roll with adhesive pieces (P). In the arrangement 
according to FIG. 2, therefore, the cover foil 5 is already peeled off on 
the one side of the adhesive tape 1. For making the joint between the ends 
of the web according to FIG. 3, also the other part of the cover foil 4 is 
pulled off the adhesive tape 1. This enables at this point the connection 
of the web end C with the old web D. The arrows in FIG. 3 indicate the 
running direction of the web. It is also evident from FIG. 3 that the 
narrow adhesive strip 7 still clings to the paper roll, that is, is 
separated from the adhesive tape 1, and at that, at a point where a 
reinforcement tape 70 is additionally taped on the paper roll which, 
however, may often also be omitted. 
As the case may be though, an adhesive tape as described above may not be 
available, for which reason overall a process for making a splice is 
proposed and described hereafter in detail using various tape formations. 
In this case, the adhesive strip, for instance 6 or 7, may also be an 
appropriately wide adhesive film. 
As stated above, the leader of the new paper roll is folded over to a loop 
G and taped in place on the paper roll using small adhesive tape pieces P. 
For instance, the cover foil 5 of the adhesive tape 2 is then removed and 
the latter is taped with its adhesive surface down on the leader C, 
parallel to the axial web edge (leader=front web end). Next, a narrow 
double-stick adhesive strip 7 with cover foil 8 according to FIG. 1 is 
affixed on the adhesive tape 2 here, for instance on the unaffixed end 
(since the cover foil 4 is still contained there) in the area of the 
longitudinal web edge. All this may be performed manually or also by means 
of an unwinding device for tape which is installed on a rail that is 
parallel to the paper roll. The expression "narrow adhesive strip" (or 
adhesive film) means here that it does not have the full width but, e.g., 
only a width of maximally 80% of the width of the adhesive tape 2, 2' etc. 
In the framework of the invention "narrow" adhesive tapes are favorably to 
be used therefor. 
According to FIG. 4, the adhesive tape 2 may also be provided with several 
smaller adhesive strips 6, 7, as the case may be also 10, with cover foils 
8, 8' and 8" on their nonstick side. 
Another tape formation is depicted in FIG. 5, where another adhesive tape 
11 of the same width as the adhesive tape 2' with cover foil 12 is applied 
on the two marginal adhesive strips 6' and 7', where the cover foil may 
additionally feature a separating point E, analogous to the separating 
point of the cover foils 4, 5 or 4', 5'. The sections of the cover foil 
can then be pulled off successively and the adhesive tape 11, and thus 
also the adhesive tape 2' and thus also the leader C can be fastened 
firmly on the paper roll. 
FIG. 6 illustrates an adhesive tape with a double-sided adhesive coating. 
It possesses on the one side, as described so far, the divided cover foils 
4" and 5" and on the other side a strip-shaped adhesive layer, such as 
indicated by the dashed lines, with the individual film strips covered 
each by a cover foil 71 through 74. While firmly attaching the web leader 
C to the paper roll, these cover foils can be removed successively and the 
adhesive tape 2" fastened firmly on the paper roll. 
This takes place, as the case may be, at a point where an additional 
adhesive tape according to FIG. 8 is applied on the next to the last lap 
of the paper roll. This is preferably a single-sided adhesive tape 70' 
used when the paper roll has in axial direction undergone a wavy 
deformation and formed grooves, due to the effect of moisture. In this 
case, the adhesive tape 70' adheres strongly to the bumps in the paper 
roll A, and the narrow adhesive strips 6, 7 or 10 or the adhesive strips 
11 (FIG. 5) or 2" (FIG. 6) adhere then very well to this additional 
adhesive tape 70'. 
Taped directly on the wavy paper roll, refer to FIG. 8, the additional tape 
70' is relatively wide, as is evident from FIG. 3, allowing all of the 
narrow adhesive strips 6, 7 to adhere to it. This additional adhesive tape 
70 or 70' has an adhesive layer of a very high adhesive strength so that 
in the splicing process, in which the leader of the new web, that is the 
paper roll A, is connected with the old web D at a high speed, this 
additional adhesive tape including the narrow adhesive strips 6, will 
continue to stick to the paper roll, and thus separate from the major 
adhesive tape 2. 
Indicated in FIG. 7 is additionally a variant of the adhesive tape 
formation according to FIG. 5, where an adhesive tape twice as wide is 
used which approximately in the center features a heavy perforation H, so 
that the tape formation according to FIG. 5 can be obtained by folding 
over in the direction of arrow F. To that end, the small adhesive strips 
6' and 7' are suitably provided here also, as indicated in FIG. 7. This 
adhesive tape is provided on the adhesive side completely with cover foils 
that are subdivided in longitudinal direction, as indicated. Thus, also 
the design of the cover foils corresponds in this case to that according 
to FIG. 5. 
Concerned are relatively large adhesive areas that pertain to the cover 
foils 4, 5, 4', 5' or 4", 5" in order to later, in the splice device (for 
so-called "flying splices"), splice the running webs flawlessly. 
Any protruding tail 90 of the paper leader C that is created when the 
adhesive tape is not affixed exactly aligned on the otherwise absolutely 
straight axial web edge can be retroactively detached, for instance simply 
torn off by hand, along the bordering axial edge of the remaining cover 
foil 4, 4'. 
It is conceivable that the tape configurations according to FIG. 1 and 4 
through 7 can be manufactured and thus be commercially available. In this 
case, the process described so far is simplified, as will be described 
hereafter. 
In the case of FIG. 2, the adhesive tape 1 or 2 is not affixed to the loop 
G, but directly to the paper roll A, for instance partly to the following 
winding B, and at that, with the narrow adhesive strip 7 or in case 
several are available with the adhesive strips 7, 8 or 10 or with 
appropriate adhesive films applied on the backside of the adhesive tape 2. 
Cover foils 8, 8' or 8" that are present, naturally, are removed 
previously. The loop G to be formed is sufficiently large so that the web 
leader C, upon eliminator of the loop, can still be taped well at the spot 
distant from the cover foil 5, according to FIG. 2. A certain end even 
needs to protrude as a "tail" 90 which then is preferably removed by hand 
in that, e.g., along the edge of the adhesive layer or the still present 
cover foil 4 this "tail" is torn off. This makes for a very simple process 
of making the splice, without requiring expensive mechanisms. Naturally, 
it is possible to provide a simple device with a linear guide for affixing 
the adhesive tapes to the paper roll. Also, making a loop G may be 
omitted, permitting the loose web end simply to hang down vertically 
according to FIG. 2. 
However, FIG. 2 indicates by broken line that the tape 1 may also be 
attached to the loop G from outside. 
FIG. 9 shows basically how the process just described can also be applied 
very well in a rewinding device for a paper roll, by stopping the new 
paper roll (i.e., naturally, at the same time also the old one) in the 
rewinding process. The adhesive tape 1 or one of the other configurations 
according to FIGS. 4-7 is then glued in the last described way, so to 
speak with the "backside" on the paper roll, as indicated by arrow 1. The 
front side is then that which preferably contains the continuous adhesive 
layer with the cover foils 4 and 5 or 4' and 5' or 4" and 5". The one 
cover foil, in the examples always 5 or 5' or 5", is first separated. 
Next, the paper roll is rotated in the direction of rotation as indicated 
by the round arrow until the web 1 has passed the squeeze point in the 
press gap between the press roll 71 and the paper roll. During this 
passage, the future web leader C is attached to the paper roll A by means 
of the adhesive tape 1. The new paper roll can then be separated from the 
old paper roll 73 with the cutter, as indicated at 72, previously or only 
subsequently. The overhang "tail" of the new paper roll A is then, as 
described above, separated along the joint of the cover foils 4 and 5, 
preferably by hand. As said before, the cover foil 4 remains generally 
still on the adhesive tape, since that foil is separated only when making 
the final splice in processing the paper roll. 
This process, as the case may be, may also be modified in that the adhesive 
tape is applied with the front side, i.e., after removal of the one cover 
foil part 4 or 5, 4' or 5', 4" or 5", on the web end in the area of the 
contact roll 71, in that then, as the case may be, the cover foils 8, 8', 
8" of the smaller adhesive strips 6 or 7 or 10 are pealed off and the 
tape, and thus the web end, i.e., actually the new web leader C, is taped 
to the new paper roll A by means of these adhesive strips, which may be 
accomplished in that the new paper roll A is rotated somewhat in the 
direction of winding, so that the adhesive tape will pass the squeeze 
point between the contact roll 71 and the new paper roll A. 
FIG. 10 is a basic sketch of a paper roll carriage 80 where on a frame 81 a 
support plate 82 is provided for the shaft 83 of the core 84 of the paper 
roll A. Mounted on the frame 81, on both sides of the paper roll A, is a 
console 85 which is perpendicular to the paper roll axis or peripheral 
surface of the paper roll A and essentially horizontal. The console is 
shown supported by a holder strip 87 featuring a guide in which the 
console 85 can be moved vertically. The console 85 supports a guide rail 
86, and at that, movable in horizontal direction in guides 88. A cassette 
or other unwinding device for adhesive tapes or adhesive strips can be 
mounted movably, and at that, along the axis of the paper roll A, on the 
guide rail. For the guide rail 86', as indicated by broken line, there may 
also be provided an essentially radial console 85' arranged relative to 
the paper roll axis, on both sides of the paper roll on the paper roll 
carriage. Not illustrated here is that the cassette or the unwinding 
device for adhesive tapes may be mounted on the guide rail 86 by means of 
a springed holder, i.e., that the cassette, for instance, might be 
connected by way of a spring arrangement with a slider block running in 
the guideway 89 of the guide rail 86. 
As illustrated in FIG. 11 and FIG. 12, the cassette K can be retained in 
the guide rail 86 by means of a slider 91 and a holder rail 92 and run 
along the guide rail 86. The holder rail 92 is fastened on the slider 
through springs 93 and bolts 94. The bolts 94 are threaded bolts, thus 
making it possible to exchange the holder rail 92 including the cassette 
for a specific cassette width. Serving that purpose is a holder plate 95 
which can be fastened on the holder rail 92 by means of wing nuts 97. Also 
illustrated is that during the unwinding of the adhesive tape the cover 
foil can be separated from the adhesive tape roll R by means of a narrow, 
thin strip 96. 
FIG. 13 illustrates a device for facilitating the attachment of the 
adhesive tape 1 to the end C of the web. There is a pivoting frame 22 
provided which on its upper end supports a guide and retaining roll 13 
that is mounted in bearings 33. This retaining roll is a hollow cylinder 
with shell bores which connect to a vacuum, relative to the atmosphere, 
which is to be generated inside the retaining roll 13. The web C is held 
thereby on the retaining roll. Below the retaining roll 13, a worktable 14 
is mounted on a lever 15 that pivots about a pivot 20 and supports a 
tabletop 16. The pivotal lever can be swiveled by a hydraulic jack element 
29, through the intermediary of its ram 30, in the position illustrated by 
broken lines, in which the tabletop 16 bears on the shell surface of the 
retaining roll 13. The hydraulic jack element 29 is mounted on a bearing 
device 32 in the swivel frame 22. The latter, in turn, is swivelable by 
means of a hydraulic jack element 21 which, for one, is mounted on a base 
19 by means of bearing element 24 and, for another, by means of a bearing 
element 23 on the swivel frame. The latter, in turn, pivots about the 
bearing point 27 on the base 19. 
FIG. 14, enlarged, illustrates the worktable 14 with the tabletop 16. The 
latter features a number of holder elements (holder pins) 25 with the aid 
of which it is possible to align the adhesive strip pieces on the tabletop 
16. Additionally, the tabletop features bores 26. The worktable 14 being 
fashioned as 60 a hollow box which by means of connection 41 can be 
subjected to a vacuum relative to the atmosphere, this vacuum becomes 
effective through the bores 26, retaining the adhesive strip pieces on the 
tabletop 16, so that, as the latter pivots toward the retaining roll 13, 
these pieces can not drop off. 
The adhesive tape, i.e., the pieces of adhesive tape, is placed on the 
worktable completely according to the form of FIG. 1 and thus applied on 
the end of the web C as the worktable 14 swivels up. As the guide and 
retaining roll 13 and the paper roll A, respectively, rotate, the end of 
the paper web C is guided in the attachment position relative to the paper 
roll A. In the process, the cover foil 8 of the narrow adhesive strip 7 is 
previously removed. 
FIG. 14 illustrates that the tabletop features a tearing edge 18 that 
corresponds to the splice edge of the web end C. In the dash-dotted 
position of the worktable 14 according to FIG. 4, this edge can be 
produced by tearing the excess paper of the web end off. 
Naturally, also other accessory devices are may be utilized which enable 
the separation of the web in the illustrated form. 
FIG. 16 shows the position of the adhesive tape 1 where it has been taped 
by the worktable 14 to the web end of FIG. 4. FIG. 15 depicts a device of 
the guide roll 13 which does not feature the worktable 14 according to 
FIG. 13. Instead, there is a fixed worktable 17 provided that is fastened 
on the swivel frame 22'. The adhesive tape 1 or pieces thereof are applied 
here directly on the end of the web C by hand. 
In FIG. 17, the worktable 15 is fashioned as a box with an approximately 
quadratic cross section. The tabletop on which the adhesive strips are 
placed is marked 16'. The interior of the box is hollow and preferably 
kept at a vacuum relative to the atmosphere, or at least partly, at any 
rate in the area where the table top 16' is located. To that end, a 
connection 41 similar to the design of the embodiment relative to FIG. 14 
is to be provided (here marked 41'). Bores 26 as in the embodiment 
according to FIG. 14 are provided as well in the work surface. For an 
indented splice according to FIG. 14, the fixing pins 25 need to be 
provided as well, which, naturally, must be retractable in design, for 
instance through spring-loading. 
The paper web hangs with its end, according to the broken line, over the 
retaining roll 13. To begin with, the worktable 50 is swiveled in a 
position in which the cutting edge 54 clips the paper web along an 
intended splicing edge. For that purpose, the shell surface of the 
retaining roll 13 is preferably rubber-coated. The adhesive strips which 
have been placed on the worktable 16' are retained by the vacuum and, upon 
retraction of the worktable 50 by means of swivel arm 15', rotated in a 
position in which the work surface 16', as illustrated in the figure, is 
exactly opposite the retaining roll 13. The adhesive strip can then be 
attached, through a controlled swivel movement of the worktable 50, also 
in zig-zag shape to the end of the paper web. This swivel movement can be 
accomplished either through a stepping motor or by means of hydraulic 
elements in keeping with the elements 21 and 29 according to FIG. 13, with 
the aid of limit switches. The swivel frame corresponds essential to that 
of FIG. 13 and is marked 22" here. 
In FIG. 18, the worktable is fashioned as roll 52 formed by a hollow 
cylinder. It also features a cutting edge 54. The work surface should be 
conceived in a position comparable to the worktable in FIG. 13. Here, too, 
the roll 52 forming the worktable must feature a swivel or rotary drive 
for a specific swivel or rotary motion. 
The bending resistance moment of the retaining roll 13 is preferably 
considerably greater than that of the worktable 16, 50 or 52. 
While this invention has been described as having a preferred design, the 
present invention can be further modified within the spirit and scope of 
this disclosure. This application is therefore intended to cover any 
variations, uses, or adaptations of the invention using its general 
principles. Further, this application is intended to cover such departures 
from the present disclosure as come within known or customary practice in 
the art to which this invention pertains and which fall within the limits 
of the appended claims.