Method and Device For Preparing a Grand Bale of Pulp Sheet and Corresponding Grand Bale

Abstract

The invention relates to a method and device for preparing a grand bale ( 10 ) of pulp sheet or similar. The grand bale ( 10 ) of pulp sheet contains two or more pulp-sheet bales ( 12 ), each of which pulp-sheet bales ( 12 ) is bound by wrapping a web-like wrapping band ( 16 ) around the bale to bind the bale. The wrapping band ( 16 ) has a start ( 18 ) lying against the pulp-sheet bale ( 12 ) and an end ( 20 ) remaining on the surface of the wrapping band ( 16 ). 1.5 or more rounds of wrapping band ( 16 ) are wrapped around the pulp-sheet bale ( 12 ). The pulp-sheet bales ( 12 ) are placed on top of each other, in such a way that gravity forms a bond between the rounds of wrapping band ( 16 ) when they remain between two of the pulp-sheet bales ( 12 ) on top of each other in the grand bale ( 10 ). The invention also relates to a corresponding grand bale ( 10 ) of pulp sheet.

1 . Method preparing a grand bale of pulp sheet or similar, in which the grand bale of pulp sheet contains two or more pulp-sheet bales, each of which pulp-sheet bales is bound by wrapping a web-like wrapping band around the bale, in such a way that the wrapping band has a start lying against the pulp-sheet bale and an end remaining on the surface of the wrapping band, characterized in that 1.5 or more rounds of wrapping band are wrapped around the pulp-sheet bale and the pulp-sheet bales are placed on top of each other, in such a way that gravity forms a bond between the rounds of wrapping band when they remain between two of the pulp-sheet bales on top of each other in the grand bale. 
   
   
       2 . Method according to  claim 1 , characterized in that, when wrapping the wrapping band around a pulp-sheet bale, the pulp-sheet bale is held between upper and lower gripper members, which gripper members remain between the rounds of wrapping band for the length of the gripper members during wrapping, which gripper members are pulled away from between the rounds of wrapping band once wrapping has terminated. 
   
   
       3 . Method according to  claim 1 , characterized in that when wrapping the wrapping band around a pulp-sheet bale, the wrapping band is kept tensioned in order to tighten the pulp-sheet bale. 
   
   
       4 . Method according to  claim 1 , characterized in that the width of the wrapping band is essentially of the same order of magnitude as the breadth of the pulp-sheet bale, the width of the wrapping band being preferably 85-100% of the breadth of the pulp-sheet bale. 
   
   
       5 . Method according to  claim 1 , characterized in that the wrapping band is glued for at least part of its overlapping length in order to secure the end, before the bales are stacked. 
   
   
       6 . Method according to  claim 1 , characterized in that the wrapping band is attached mechanically to the wrapping band or pulp-sheet bale for at least part of the length of the wrapping band, in order to secure it, before the bales are stacked. 
   
   
       7 . Method according to  claim 1 , characterized in that the edges of the wrapping band are turned over twice. 
   
   
       8 . Method according to  claim 1 , characterized in that the wrapping band is of a pulp or paper web. 
   
   
       9 . Method according to  claim 1 , characterized in that the wrapping band is of the same material as the pulp-sheet bale. 
   
   
       10 . Grand bale of pulp sheet, which includes two or more pulp-sheet bales stacked on top of each other, each pulp-sheet bale of which is bound in a web-like wrapping band, in such a way that the wrapping band has a start lying against the pulp-sheet bale and an end remaining on the surface of the wrapping band, characterized in that 1.5 or more rounds of the wrapping band are wrapped around the pulp-sheet bale, in such a way that a bond is arranged to be formed by gravity between the rounds of wrapping band, between two of the pulp-sheet bales stacked on top of each other in the grand bale of pulp sheets. 
   
   
       11 . Grand bale of pulp sheet, according to  claim 10 , characterized in that the said wrapping band is tightly around the pulp-sheet bale, in order to keep the pulp-sheet bale tight. 
   
   
       12 . Grand bale of pulp sheet, according to  claim 10 , characterized in that the said wrapping band is of the same material as the pulp-sheet bale itself. 
   
   
       13 . Grand bale of pulp sheet, according to  claim 10 , characterized in that the edges of the wrapping band around the said pulp-sheet bales are turned over at least twice. 
   
   
       14 . Device for preparing grand bales of pulp sheet or similar, which grand bales of pulp sheet are arranged to contain pulp-sheet bales, which device includes a jig unit, by means of which grand bales of pulp sheet are arranged to be assembled from pulp-sheet bales; a wrapping station, by means of which a web-like wrapping band is arranged to be wrapped around the pulp-sheet bale, in such a way that the wrapping band has a start lying against the pulp-sheet bale and an end remaining on the surface of the wrapping band; and conveyors, which are arranged to carry the pulp-sheet bales to the wrapping station and forwards to the jig unit, characterized in that the wrapping station and the jig unit are arranged to form a grand bale, in such a way that the wrapping band is bound between the pulp-sheet bales also by the gravity acting on the upper pulp-sheet. 
   
   
       15 . Device according to  claim 14 , characterized in that the wrapping station has tensioning elements, which are arranged to tighten the wrapping band when wrapping a pulp-sheet bale and to maintain the tension after the cutting of the wrapping band. 
   
   
       16 . Device according to  claim 14 , characterized characterized in that the said jig unit is arranged to place the end of the wrapping band between two pulp-sheet bales in the grand bale of pulp sheet. 
   
   
       17 . Device according to  claim 14 , characterized in that the wrapping station has an adhesive spray, which is arranged to spray adhesive to secure the end of the wrapping band. 
   
   
       18 . Device according to  claim 14 , characterized in that the wrapping station has a mechanical closing device, which is arranged to form mechanical attachments in the material of the wrapping band and the pulp-sheet bale. 
   
   
       19 . Device according to  claim 17 , characterized in that the tensioning elements include a press roller, which is arranged to keep the end of the wrapping band tight while the mechanical closing device is making the attachments, or to press the wrapping band onto the adhesive, one the adhesive spray had sprayed the adhesive. 
   
   
       20 . Device according to  claim 14 , characterized in that the tensioning elements include a set of rollers, which is arranged to tension the wrapping band while the pulp-sheet bale is being wrapped. 
   
   
       21 . Device according to  claim 14 , characterized in that the wrapping station has a bale rotator, which includes gripper members, which are arranged to hold the pulp-sheet bale during wrapping.