Method for forming a cast sheet material

Abstract

The present invention relates to a method for forming a cast sheet material, comprising introducing a slurry in a casting apparatus, casting the slurry onto a movable support by means of a casting means to form a layer and drying the layer for obtaining the cast sheet material.

1 . A method for forming a cast sheet material ( 64 ), comprising:
 introducing a slurry ( 60 , 61 ) in a casting apparatus ( 6 , 7 ),   casting the slurry onto a movable support ( 63 ) by means of a casting means to form a layer and drying the layer for obtaining the cast sheet material, characterized in that the slurry comprises at least two different types of slurries that are inhomogeneously blended with each other, such that in the cast sheet material the at least two different types of slurries are distinguishable as different types of sheet.   
     
     
         2 . The method according to  claim 1 , characterized in that the cast sheet material obtained after drying is a single layer. 
     
     
         3 . The method according to  claim 1 , characterized in that the at least two different types of slurries are different from each other in the composition thereof, wherein components of the composition are chosen from the group of fragrances, flavours, colouring agents, plant based materials, binding agents, humectants and fibers, or a combination thereof. 
     
     
         4 . The method according to  claim 3 , characterized in that the at least two different types of slurries are different from each other in the amounts of some or all of the components of the composition. 
     
     
         5 . The method according to  claim 1 , characterized in that the at least two different types of slurries are mixed in the same ratio or in different ratios. 
     
     
         6 . The method according to  claim 1 , characterized in that between the step of casting and the step of drying an intermediate step is carried out, the intermediate step comprising disturbing the layer on the moveable support for changing the pattern of the layer formed by the casting step. 
     
     
         7 . The method according to  claim 1 , comprising the following steps: a) preparing a base slurry; b) diverting the base slurry into two or more different slurry streams; c) adding to at least one of the slurry streams one or more components for creating a slurry stream having a composition that is different from the other slurry stream(s); d) casting the slurry streams thus obtained onto the movable support. 
     
     
         8 . The method according to  claim 7 , characterized in that before step d) an intermediate step is carried out, the intermediate step comprises inhomogeneously blending of the slurry streams. 
     
     
         9 . A cast sheet material consisting of a layer, in which layer at least two different types of slurries are distinguishable as different types of sheet material. 
     
     
         10 . The cast sheet material according to  claim 9 , characterized in that the cast sheet material is a single layer. 
     
     
         11 . The cast sheet material according to  claim 9 , characterized in that the at least two different types of slurries are different from each other in the composition thereof, wherein components of the composition are chosen from the group of fragrances, flavours, colouring agents, plant based materials, binding agents, humectants and fibers, or a combination thereof. 
     
     
         12 . The cast sheet material according to  claim 9 , characterized in that the at least two different types of slurries are different from each other in the amount of the components of the composition. 
     
     
         13 . The use of a cast sheet material obtained according to the method according to  claim 1  as a wrapper for a smoking article. 
     
     
         14 . The use of a cast sheet material according to  claim 13 , characterized in that the wrapper is a heat-not-burn article.