Formed body

Abstract

A tubular formed body defining a longitudinal axis and made of several layers of rolled-up lined corrugated cardboard having flutes extending in a direction of the longitudinal axis, wherein at least some of adjoining one of the layers are securely connected to one another through a positive engagement.

What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims:  
     
         1 . A tubular formed body defining a longitudinal axis and made of several layers of rolled-up lined corrugated cardboard having flutes extending in a direction of the longitudinal axis, wherein at least some of adjoining one of the layers are securely connected to one another through a positive engagement.  
     
     
         2 . The formed body of    claim 1    wherein the positive engagement of at least some of the adjoining one of the layers is implemented through interconnection of complementary tongues and openings.  
     
     
         3 . The formed body of    claim 1    wherein the layers have an inner side provided with a score line extending in a direction of the flutes.  
     
     
         4 . The formed body of    claim 3    wherein the score line is formed through a weak material area of the layers.  
     
     
         5 . The formed body of    claim 2    wherein each of the layers has an inner side provided with a score line extending in a direction of the flutes and defining a weak material area of the layers, said tongues and openings provided in the area of the score lines of the layers.  
     
     
         6 . The formed body of    claim 2    wherein the tongues and openings are so dimensioned as to engage in a frictional manner.  
     
     
         7 . The formed body of    claim 1    wherein the layers are made of corrugated cardboard lined on both sides.  
     
     
         8 . The formed body of    claim 1    wherein a last one of the layers forms an outer side of the formed body and is glued to a subjacent one of the layers.  
     
     
         9 . A tubular formed body made of several layers of rolled-up corrugated cardboard having flutes extending in a direction of the longitudinal axis, said formed body having connection means for positive securement of adjoining layers.  
     
     
         10 . The formed body of    claim 9    wherein the connection means includes a tongue in one of the layers and a complementary opening in another one of the layers.  
     
     
         11 . The formed body of    claim 9    wherein the layers have an inner side provided with a score line extending in a direction of the flutes.  
     
     
         12 . The formed body of    claim 11    wherein the score line is formed through a weak material area of the layers.  
     
     
         13 . The formed body of    claim 10    wherein each of the layers has an inner side provided with a score line extending in a direction of the flutes and defining a weak material area of the layers, wherein the connection means is provided in the area of the score lines of the layers.  
     
     
         14 . The formed body of    claim 10    wherein the connection means is so dimensioned that the tongue engages the opening in a frictional manner.  
     
     
         15 . The formed body of    claim 9    wherein the layers are made of corrugated cardboard lined on both sides.  
     
     
         16 . The formed body of    claim 9    wherein a last one of the layers forms an outer side of the formed body and is glued to a subjacent one of the layers.  
     
     
         17 . A formed body, comprising a strip-like blank made of corrugated cardboard and subdivided in a series of sections by spaced-apart score lines extending across the blank, wherein successive sections are securely connected to one another through engagement of a tongue formed in one section in opening formed in an adjoining one of the sections during roll-up of the blank to form a multi-layered formed body.  
     
     
         18 . The formed body of    claim 17    wherein the tongue and opening engagement is provided in the area of each of the score lines.  
     
     
         19 . The formed body of    claim 17    wherein the tongue and the opening are so dimensioned as to engage in a frictional manner.  
     
     
         20 . The formed body of    claim 17    wherein a last one of the series of sections forms an outer side of the formed body and is glued to a subjacent one of the sections.  
     
     
         21 . A method of making a formed body, comprising the steps of rolling up a strip-like blank made of several layers of corrugated cardboard and subdivided in a series of sections by spaced-apart score lines extending across the blank, and engaging a tongue of one section in an opening of another section.