Paper filter for flavor inhalation product

Abstract

Provided is a paper filter for a flavor inhalation product, the paper filter having a rod-form filter medium and a rolled paper that rolls up the filter medium, wherein: the filter medium includes a wave-shaped paper sheet in which peaks and troughs are arranged in an alternating manner and so as to be continuous in a long-axis direction; the draw resistance in an airflow direction ranges from 0.2 mm H2O/mm to 1.0 mm H2O/mm; and the hardness in a direction perpendicular to the long axis ranges from 80.0% to 95.0%.

1 . A paper filter for flavor inhalation products, the paper filter comprising:
 a rod-shaped filter element; and   a wrapping paper with which to wrap the filter element,   wherein the filter element includes a corrugated paper sheet with alternate ridges and grooves extending continuously in a longitudinal direction;   a draw resistance of the paper filter in an airflow direction is greater than or equal to 0.2 mm H 2 O/mm and less than or equal to 1.0 mm H 2 O/mm; and   a hardness of the paper filter in a direction perpendicular to a long axis is greater than or equal to 80.0% and less than or equal to 95.0%, the hardness being represented by Equation (1):
   hardness (%) in the direction perpendicular to the long axis=( D   d   /D   s )×100  Equation (1),
 
   where D s  (mm) is a cross-sectional diameter of the paper filter in the direction perpendicular to the longitudinal direction before application of a load F, and D d  (mm) is a cross-sectional diameter of the paper filter in the direction perpendicular to the longitudinal direction after application of the load F, the load F being a compressive load of 3 N/mm applied to the paper filter for a compression time of 10 seconds in the direction perpendicular to the long axis.   
     
     
         2 . A paper filter for flavor inhalation products, the paper filter comprising:
 a rod-shaped filter element; and   a wrapping paper with which to wrap the filter element,   wherein the filter element includes a corrugated paper sheet with alternate ridges and grooves extending continuously in a longitudinal direction;   a draw resistance of the paper filter in an airflow direction is greater than or equal to 0.2 mm H 2 O/mm and less than or equal to 1.0 mm H 2 O/mm; and   a maximum compressive load measured while the paper filter is being compressed in the longitudinal direction at a compression velocity of 20 mm/min is greater than or equal to 15 N and less than or equal to 30 N.   
     
     
         3 . The paper filter for flavor inhalation products according to  claim 1 , wherein a difference between a maximum height of the ridges and a maximum depth of the grooves is greater than or equal to 50 μm and less than or equal to 500 μm. 
     
     
         4 . The paper filter for flavor inhalation products according to  claim 1 , wherein the corrugated paper sheet is a creped sheet of a raw material sheet which has a basis weight of greater than or equal to 40 gsm and less than or equal to 120 gsm, a thickness of greater than or equal to 30 μm and less than or equal to 130 μm, and a width of greater than or equal to 70 mm and less than or equal to 200 mm; and
 the width is a length in a direction perpendicular to a direction corresponding to a longitudinal direction of the filter element including the corrugated paper sheet produced from the raw material sheet. 
 
     
     
         5 . The paper filter for flavor inhalation products according to  claim 1 , wherein a density of the filter element is greater than or equal to 0.16 g/cm 3  and less than or equal to 0.34 g/cm 3 . 
     
     
         6 . The paper filter for flavor inhalation products according to  claim 1 , wherein the wrapping paper has a basis weight of greater than or equal to 30 gsm and less than or equal to 100 gsm, and a thickness of greater than or equal to 30 μm and less than or equal to 130 μm. 
     
     
         7 . A filter segment for flavor inhalation products, the filter segment comprising the paper filter for flavor inhalation products according to  claim 1 . 
     
     
         8 . A rod-shaped flavor inhalation product comprising:
 a tobacco rod portion; and   a mouthpiece portion,   wherein the mouthpiece portion includes the paper filter for flavor inhalation products according to  claim 1 .   
     
     
         9 . A method for manufacturing the paper filter for flavor inhalation products according to  claim 1 , the method comprising:
 a creping step of creping a raw material sheet to form the corrugated paper sheet;   a compacting step of compacting the corrugated paper sheet to form the filter element; and   a wrapping step of wrapping the filter element with the wrapping paper.   
     
     
         10 . The paper filter for flavor inhalation products according to  claim 2 , wherein a difference between a maximum height of the ridges and a maximum depth of the grooves is greater than or equal to 50 μm and less than or equal to 500 μm. 
     
     
         11 . The paper filter for flavor inhalation products according to  claim 2 , wherein the corrugated paper sheet is a creped sheet of a raw material sheet which has a basis weight of greater than or equal to 40 gsm and less than or equal to 120 gsm, a thickness of greater than or equal to 30 μm and less than or equal to 130 μm, and a width of greater than or equal to 70 mm and less than or equal to 200 mm; and
 the width is a length in a direction perpendicular to a direction corresponding to a longitudinal direction of the filter element including the corrugated paper sheet produced from the raw material sheet. 
 
     
     
         12 . The paper filter for flavor inhalation products according to  claim 2 , wherein a density of the filter element is greater than or equal to 0.16 g/cm 3  and less than or equal to 0.34 g/cm 3 . 
     
     
         13 . The paper filter for flavor inhalation products according to  claim 2 , wherein the wrapping paper has a basis weight of greater than or equal to 30 gsm and less than or equal to 100 gsm, and a thickness of greater than or equal to 30 μm and less than or equal to 130 μm. 
     
     
         14 . A filter segment for flavor inhalation products, the filter segment comprising the paper filter for flavor inhalation products according to  claim 2 . 
     
     
         15 . A rod-shaped flavor inhalation product comprising:
 a tobacco rod portion; and   a mouthpiece portion,   wherein the mouthpiece portion includes the paper filter for flavor inhalation products according to  claim 2 .   
     
     
         16 . A method for manufacturing the paper filter for flavor inhalation products according to  claim 2 , the method comprising:
 a creping step of creping a raw material sheet to form the corrugated paper sheet;   a compacting step of compacting the corrugated paper sheet to form the filter element; and   a wrapping step of wrapping the filter element with the wrapping paper.