Banding of stacked goods to be packaged

Abstract

A method for banding stacked, soft and/or fragile products to be packed, using a wrapping machine. The unwound band is guided around the product to be packed, pulled by a reverse movement onto the product to be packed, then stuck or welded, and cut. A pre-selection loop of the band is pulled back by the reverse movement, by an electronic control system, to a pre-selected length of loop (L). The method can be used to band soft and/or fragile products in a fully automatic manner, economically satisfying the highest requirements.

1 . Method for banding stacked, soft and/or sensitive goods to be packaged ( 52 ), with a banding machine ( 10 ), wherein the unwound package band ( 22 ) is guided around the goods to be packaged ( 52 ), pulled onto the goods to be packaged ( 52 ) in a reverse movement, glued or welded and cut off, characterised in that a preselection loop of the package band ( 22 ) is pulled back to a preselected loop length (L) in the reverse movement with the aid of an electronic control system ( 60 ).  
   
   
       2 . Method according to  claim 1 , wherein an electronically activated, co-running rotary encoder roller ( 44 ) ends the reverse movement of the package band ( 22 ) at the preselected loop length (L).  
   
   
       3 . Method according to  claim 1 , wherein the loop length (L) is predetermined by measuring the stacked goods to be packaged ( 52 ), the data is entered and selectably stored for the digital control system ( 60 ).  
   
   
       4 . Method according to  claim 3 , wherein the stacked goods to be packaged ( 52 ) are automatically measured at the beginning of the process.  
   
   
       5 . Method according to  claim 4 , wherein necessary value corrections for the loop length (L) are entered and selectably stored.  
   
   
       6 . Method according to  claim 1 , wherein if the loop length (L) is not reached, the process is interrupted and a fault is indicated.  
   
   
       7 . Method according to  claim 1 , wherein, in addition to the preselected loop length (L), for the ending of the reverse movement of the package band ( 22 ), a maximum band tension which can be selected by the control system ( 60 ), preferably a digital control system, is entered, and in the event of being exceeded, the process is interrupted and a fault is indicated.  
   
   
       8 . Method according to  claim 1 , wherein in addition to the preselected loop length (L), for the ending of the reverse movement of the package band ( 22 ), a minimum band tension which can be selected by the control system ( 60 ), is entered and in the event of a repeated successive falling below the minimum band tension, a programme-controlled shortening of the loop length (L) takes place, or in the event of a first instance of falling below the minimum band tension, the process is interrupted and a fault is indicated.  
   
   
       9 . Method according to  claim 1 , wherein a printed package band ( 22 ) is positioned so as to be precisely repeatable with a printer's imprint control system.  
   
   
       10 . Method according to  claim 1 , wherein, in the banding machine ( 10 ), printed information is checked with the aid of the preselection loop and preferably banded centrally.