Group package for sheet material and method for manufacturing the group package

Abstract

This invention relates to a group package ( 1 ) for sheet material such as printing and photocopy paper, and a method for manufacturing the protective wrap of the group package and the group package itself. In the group package ( 1 ), a number of paper bundles ( 1 a ) wrapped in their own ream wraps ( 2 a ) consisting of at least a base paper layer ( 19 a ), are placed within a shared protective wrap ( 2 ). The material of the protective wrap ( 2 ) and of the wrap ( 2 a ) of the paper bundles ( 1 a ) is formed by adding plastic, a polymer mixture or another suitable material to one or both of the materials, in suitable quantities to make the combined water vapour transmission rate (WVTR) of the protective wrap ( 2 ) and the wrap ( 2 a ) less than approx. 50 g/m 2 /d, as calculated according to the ISO 2528:1995 standard.

1 . A group package ( 1 ) for sheet material such as printing and photocopy paper, in which group package ( 1 ) a number of paper bundles ( 1   a ) wrapped in their own wrap ( 2   a ) consisting at least of a base paper layer ( 19   a ), are placed inside a shared protective wrap ( 2 ), and in which plastic, a polymer mixture or another suitable material that slows down the penetration of moisture is added at least to the base paper layer ( 19   a ) of the wrap ( 2   a ), characterised in that the material of the protective wrap ( 2 ) and the material of the wrap ( 2   a ) used for the paper bundles ( 1   a ) is formed by adding plastic, polymer mixture or another suitable material to both wrap materials such quantities that the water vapour transmission rate (WVTR) of the protective wrap ( 2 ) and the wrap ( 2   a ) in common is less than approximately 50 g/m 2 /d, as calculated according to the ISO 2528:1995 standard. 
   
   
       2 . A group package ( 1 ) for sheet material such as printing and photocopy paper, in which group package ( 1 ) a number of paper bundles ( 1   a ) wrapped in their own wrap ( 2   a ) consisting at least of a base paper layer ( 19   a ), are placed inside a shared protective wrap ( 2 ), consisting at least of a base paper layer ( 19 ), in which package plastic, a polymer mixture or another suitable material that slows down the penetration of moisture is added at least to the base paper layer ( 19   a ) of the wrap ( 2   a ), characterised in that the material of the protective wrap ( 2 ) and the material of the wrap ( 2   a ) used for the paper bundles ( 1   a ) are formed by adding plastic, polymer mixture or another suitable material to both wrap materials' base paper layers ( 19 ,  19   a ) such quantities that the water vapour transmission rate (WVTR) of the protective wrap ( 2 ) and the wrap ( 2   a ) in common is less than approximately 50 g/m 2 /d, as calculated according to the ISO 2528:1995 standard. 
   
   
       3 . A group package ( 1 ) according to  claims 1  or  2 , characterised in that the total water vapour transmission rate of the protective wrap ( 2 ) and the wrap ( 2   a ), as calculated according to the ISO 2528:1995 standard, is a maximum of approx. 30 g/m 2 /d and favourably a maximum of approximately 10 g/m 2 /d. 
   
   
       4 . A group package ( 1 ) according to  claim 1 , characterised in that the protective wrap ( 2 ) and the wrap ( 2   a ) contain a maximum of approximately five percent of their own total weight in plastic. 
   
   
       5 . A group package ( 1 ) according to  claim 2 , characterised in that the protective wrap ( 2 ) consists of an essentially similar, paper-like and pliable wrapping to that of the wraps ( 2   a ) of the paper bundles ( 1   a ). 
   
   
       6 . A group package ( 1 ) according to  claim 2 , characterised in that plastic, a polymer mixture or another similar material that slows down the penetration of moisture is added at least to the wrap ( 2   a ) of the paper bundles ( 1   a ) using the online method during the production of the wrap ( 2   a ) in a paper machine. 
   
   
       7 . A group package ( 1 ) according to  claim 2 , characterised in that the wrapping that forms the group package's ( 1 ) protective wrap ( 2 ) is taken directly from a reel and wrapped at least once around the long sides of the group package ( 1 ), and that on the inner surface of the protective wrap, at least close to one end of the group package ( 1 ), there is an opening strip ( 23 ), essentially the same length as the protective wrap and placed lengthwise along the protective wrap. 
   
   
       8 . A group package ( 1 ) according to  claim 2 , characterised in that at the ends of the group package ( 1 ), the edges of the protective wrap of the package are folded creating folds ( 3 - 6 ) so that at least one outer fold ( 3 ,  4 ) is attached to one inner fold ( 5 ,  6 ). 
   
   
       9 . A group package ( 1 ) according to  claim 2 , characterised in that a lifting gap ( 7 ) is formed between the outer folds ( 3 ,  4 ) and the inner folds ( 5 ,  6 ), and in that the lower edges of the outer folds ( 3 ,  4 ) are designed to work as lifting supports. 
   
   
       10 . A group package ( 1 ) according to  claim 2 , characterised in that at least one separate carry handle ( 13 ,  14 ,  15 ,  16 ) is attached to the protective wrap ( 2 ) of the group package ( 1 ). 
   
   
       11 . A method for producing the protective wrap ( 2 ) for a group package ( 1 ) of sheet material such as printing and photocopy paper, and/or the wraps ( 2   a ) for the paper bundles ( 1   a ) to be packed in the group package ( 1 ), characterised in that in producing the material of the protective wrap ( 2 ) and/or the material of the wrap ( 2   a ), plastic, a polymer mixture or another suitable material is added to the base paper layer ( 19 ,  19   a ) of the material using online technology in a paper machine, in suitable quantities to make the combined water vapour transmission rate (WVTR) of the protective wrap ( 2 ) and the wrap ( 2   a ) of the finished group package ( 1 ) less than approx. 50 g/m 2 /d, as calculated according to the ISO 2528:1995 standard. 
   
   
       12 . A method according to  claim 11 , characterised in that in producing the material of the protective wrap ( 2 ) and/or the material of the wrap ( 2   a ), plastic, a polymer mixture or another suitable material is added to the base paper layer ( 19 ,  19   a ) of the material using online technology in a paper machine, in suitable quantities to make the combined water vapour transmission rate (WVTR) of the protective wrap ( 2 ) and the wrap ( 2   a ) of the finished group package ( 1 ) a maximum of approx. 30 g/m 2 /d, favourably a maximum of approx. 10 g/m 2 /d. 
   
   
       13 . A method according to  claims 11  or  12 , characterised in that in producing the material of the protective wrap ( 2 ) and/or the material of the wrap ( 2   a ), plastic, a polymer mixture or another suitable material is added to the base paper layer ( 19 ,  19   a ) of the material using online technology in a paper machine, in suitable quantities that the materials ( 2 ,  2   a ) contain a maximum of approx. five percent of their own total weight in plastic. 
   
   
       14 . A method according to  claim 11 , characterised in that the group package is formed out of essentially strong and durable reel-based wrapping material, which is cut into the correct length at the beginning of the packaging process and which forms the protective wrap ( 2 ), which is placed centrally along its width on top of the paper bundles to be packed, and in that an initial wrapping is done by wrapping the protective wrap around the office paper bundles ( 1   a ), after which the wrap's end folds are formed by pressing the inner folds ( 5 ,  6 ) against the end of the group package ( 1 ), formed by the end surfaces of the paper bundles, and the outer folds ( 3 ,  4 ) are formed by folding the parts of the protective wrap that exceed the length of the paper bundles at the vertical ends to form essentially two triangular folds, and that after the folds are made, the outer folds ( 3 ,  4 ) are attached at the ends of the group package ( 1 ) at least to one of the inner folds ( 5 ,  6 ) and, if necessary, also to each other. 
   
   
       15 . A method according to  claim 14 , characterised in that the group package ( 1 ) is produced out of reel-based, essentially strong and durable wrapping material that forms a protective wrap ( 2 ), which wrapping material is wrapped directly off the reel around the office paper, and in that the folds ( 3 ,  4 ) at the ends of the group package form supports that act as carry handles. 
   
   
       16 . A group package ( 1 ) according to  claim 2 , characterised in that the protective wrap ( 2 ) and the wrap ( 2   a ) contain a maximum of approximately five percent of their own total weight in plastic. 
   
   
       17 . A group package ( 1 ) according to  claim 3 , characterised in that the protective wrap ( 2 ) and the wrap ( 2   a ) contain a maximum of approximately five percent of their own total weight in plastic.