Abstract:
An adhesive label is useable to overlie an adhesive strip and is situated at the leading end of a paper web wound in a roll. The adhesive label is positioned in the running area of a driving belt of a roll changer in a rotary printing machine and is one of several two part labels that are each provided with a defined tear line. These labels are placed over the cut edge of the first layer of the paper web. Each label is provided, in its trailing portion with a plurality of holes.

Description:
FIELD OF THE INVENTION 
     The present invention relates to an adhesive label for a supply roll of a paper web for a web-fed rotary printing press. 
     DESCRIPTION OF THE PRIOR ART 
     Adhesive labels for supply paper rolls are generally known, for use wherein the beginning of the paper web is fastened on the second layer of the paper web. DE 88 01 163 U1 describes an adhesive label with a predetermined tear line for attaching the beginning of a paper web to a paper web supply roll. 
     It is disadvantageous with this prior device that no connection between the web running out and the beginning of the paper web supply roll is created in the area of the adhesive label. 
     WO 95/05989 describes an adhesive label for fastening the beginning of a paper web on a paper web supply roll. This adhesive label is provided with a predetermined tear line. 
     DE-AS 12 67 930 discloses an adhesive label for fastening an adhesive strip of an paperweb supply roller. 
     SUMMARY OF THE INVENTION 
     The present invention has the object of providing an adhesive label for affixing a beginning of a paper web on a paper web supply roll. 
     In accordance with the present invention, this object is attained by providing an adhesive label which has, in the direction of rotation of the paper web supply roll, a leading label element and a trailing label element. Both of these label elements are delimited by a predetermined tear line. At least the trailing label element has holes. The trailing label element also has a width which corresponds, at least, to the width of the adhesive application or strip applied to the beginning of the paper web. 
     The advantages which can be achieved by of the present invention consist in particular in that, even when the drive belt used to rotate the fresh paper web supply roll is placed obliquely to the roll, and when there is a shortened run-up time of a fresh paper web supply roll provided with one or several adhesive labels, there is no “fly-away” and detachment of the holding labels from the beginning of the paper web. A relative axial movement between the paper web supply roll and the drive belt is absorbed without damage by the adhesive label. If in the course of acceleration of the paper web supply roll there should be penetration of adhesive through the perforations of the adhesive label, so that adhesive also gets on the drive belt, no “lifting” of the paper web beginning at each revolution takes place because of the retentive effect of the closure element of the adhesive label. Therefore no tearing of the adjoining holding labels and no “fly-away” of the paper web occurs. Because the paper web beginning is glued to the second layer of the supply roll of paper web, at least in the area of the belt travel, the penetration of air during the start up between the beginning of the paper web and the second layer and therefore a premature tearing of the holding labels is prevented. An open adhesive, as well as an adhesive strip with adhesive on both sides can be used as the adhesive application at the beginning of the paper web. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The present invention is represented by several preferred embodiments and will be described in greater detail in what follows. Shown are in: 
     FIG. 1, a front view of a portion of a paper web supply roll  1  with a first preferred embodiment of a prepared adhesive by means of holding labels extending in an axis-parallel direction, and with an adhesive label for the belt travel area; 
     FIG. 2, an enlarged representation of a predetermined tear line of an adhesive label in accordance with a second preferred embodiment; and 
     FIG. 3, a representation analogous to FIG. 2 in accordance with a third preferred embodiment. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     A cut edge  2  of the beginning  3  of a paper web formed on a paper web supply roll  1 , and extending in an axis-parallel or oblique direction, is maintained on a second layer  7  of the paper web supply roll  1  by means of holding labels  6 , which are adhesive on one side and which are provided, for example, with a tear line or perforation line  4 , all as seen in FIG.  1 . An adhesive application, for example an adhesive strip  8  with adhesive on both sides, extends parallel with the cut edge  2 , wherein an adhesive strip leading edge  10  is located in the immediate vicinity (for example within, one millimeter) from the cut edge  2  of the beginning  3  of the paper web. One or several adhesive labels  12 , which are adhesive on their underside, are arranged in a drive belt travel area or drive belt contact area  9 , in which a drive belt  11  of a supply paper web acceleration device acts on the circumference of the paper web supply roll  1 . The adhesive labels  12  have been glued on in such a way that in the operating direction of rotation D of the supply roll  1  a leading label element  13  of each adhesive label  12  is located on the second layer  7  of the paper web supply roll  1 . A trailing label element  14  of the adhesive label  12  projects past the cut edge  2  of the beginning  3  of the paper web and bridges, or covers, the adhesive strip  8  in the travel or contact area  9  of the drive belt  11 . 
     A predetermined tear line  16 , delimits both label elements  13 ,  14 . This tear line  16  extends between the label element  13  and the label element  14  of the adhesive label  12 . 
     The predetermined tear line  16  consists of perforation openings spaced apart from each other in the axial direction of the paper web supply roll  1 . In the applied state of the adhesive label  12  the tear line  16  extends along the cut edge  2  of the beginning  3  of the paper web. For example, the perforation openings consist of strips  19 ,  21  of label  12  with slits  17 ,  18  arranged between them The two axially outer strips  19 , respectively located in the vicinity of each lateral edge  15  of the adhesive label  12 , are longer, for example 5 mm, than the center strip  21 , which is, for example, 2 mm Therefore the center strip  21  is shorter with respect to the strips  19  close to the lateral elements  15 , since less force is exerted at this location when the predetermined tear line  16  is torn open. The drive belt  11  extends in such a way that its width ends approximately centered between the outer strips  19 . Respective lateral edge cuts  17  are located at each lateral edge of the adhesive label  12 . Because of this, the predetermined tear line  16  is preset when the paper web supply roll  1  is torn open at its cut edge  2 . 
     In accordance with a second preferred embodiment of the present invention, as seen in FIG. 2, an end  20  of a slit  18  respectively located in the vicinity of a strip  19 , can also point obliquely in respect to the predetermined tear line  16  in the direction of the holes  22  in the cover element  14 . In this way, the trailing label or cover element  14  at least partially covers the adhesive strip  8 . 
     It is also possible to guide two obliquely directed ends  20  of a slit  18  simultaneously both in the direction toward the holes  22  and in the direction of the leading label element  13 . 
     In accordance with a third preferred embodiment of the present invention, as seen in FIG. 3, each strip  19  can have, starting at the predetermined tear line  16 , several slits  26  extending obliquely next to each other over the entire length “c” of each strip  19 . These slits  26  can be located on the leading label element  13  as well as on the trailing label element  14 . 
     The trailing label element  14  has, for example, a width “a” of 55 mm, which width “a”must at least correspond to a width “b” of 50 mm of the two-sided adhesive strip  8 , as seen in FIG.  1 . The leading label element  13  can be of the same width, or can be wider or narrower than the width “a” of the trailing label element  14 . A number of holes  22 , spaced apart next each other, are arranged in the trailing label element  14 , at least in the vicinity of the predetermined tear line  16 . Means adjoining the predetermined tear line  16  or slightly spaced apart from it, for example by 1 millimeter, are arranged in the vicinity of the predetermined tear line  16 . The holes  22  can also occupy the entire width “a” of the trailing label element  14 . 
     The holes  22  can be circular, oval or rectangular, or can have other geometric shapes. 
     A grooved or scored line, i.e. a line weakened or reduced continuously in paper thickness, can also be used as predetermined tear line  16 . 
     During acceleration of the paper web supply roll  1 , the drive belt  11  runs on the paper web supply roll  1  in the travel area  9  and comes into contact with the adhesive label  12  which consists of the two elements  13 ,  14  and which covers the two-sided adhesive strip  8  in the travel area  9 . In the course of connecting the beginning  3  of the paper web of the fresh paper web supply roll  1  with a paper web of a paper web roll, not represented, which for example is running out, the running-out paper web is pressed against the adhesive strip  8  and an adhesive connection is made. The running-out paper web is pressed on the area of the adhesive strip  8  which is covered by the adhesive label  12  by a contact-pressure roller in such a way, that the running-out paper web comes into contact, through the holes  22 , with the adhesive of the adhesive strip  8  located underneath the holes  22 . The perforations  4 ,  16  of the holding and adhesive labels  6 ,  12 , respectively are then torn open. 
     It is furthermore possible to also provide the leading label element  13  of the adhesive label  12  with holes  22 . 
     In accordance with a further characteristic of the present invention, it is also advantageous if the two-part holding labels  6 , which have a perforation  4  over the cut edge  2 , are also provided with holes  22  that are, at least located in the label element  23  which is trailing, in the operating direction of rotation D of the paper web supply roll. The holes  22  are at least located in the vicinity of the predetermined tear line  4 . By means of this, it becomes possible that the trailing label element  23  of this holding label  6  is glued to the adhesive strip  8  and at least partially covering it, while its leading label element  24  is glued to the second layer  7  of the paper web supply roll  1 . In the course of connecting the paper webs, the running-out paper web can also come into contact with the adhesive strip  8  through the holes  22  in the trailing label element  24  of the holding label  6 . 
     It is furthermore possible to also provide the leading label element  24  of the holding label  6  with holes  22 . 
     In its length extending in the axial direction of the paper web supply roll  1 , the adhesive label  12  can also be of such dimensions that several adhesive labels  12 , arranged directly one next to the other, can be provided in the travel area  9  of the drive belt  11 . 
     It is necessary that at least the leading label element  13 ,  24  of each of the adhesive label  12  and of the holding label  6 , respectively has an adhesive application on the side facing the supply roll  1 , i.e. the second layer  7  of the paper web supply roll  1 . 
     While preferred embodiments of an adhesive label in accordance with the present invention have been set forth fully and completely hereinabove, it will be apparent that a number of changes in, for example the size of the paper web supply roll, the operation of the drive belt, and the like can be made without departing from the true spirit and scope of the present invention which is accordingly to be limited only by the following claims.