Carbon heat source drying method

Patent metadata

Field	Value
Publication number	US-2016161184-A1
Application number	US-201615047074-A
Country	US
Kind code	A1
Filing date	Feb 18, 2016
Priority date	Sep 25, 2013
Publication date	Jun 9, 2016
Grant date	—

Abstract

When a kneaded mixture produced by adding a hinder-containing additive and water to carbon powder and kneading the mixture is formed into a rod-shaped carbon heat source (HS) and the carbon. heat source (HS) is subsequently dried to manufacture a finished product, a drying method according to the present invention includes generating a dry atmosphere in which an evaporation rate (Vo) at which the water evaporates through an outer surface of the carbon heat source (HS) is made approximately equal to a speed (Vs) at which the water in the carbon heat source (HS) moves toward the outer surface while a weight absolute humidity (AH) is lowered in a stepwise manner, and drying the carbon heat source (HS) in the dry atmosphere.

First claim

1 . A carbon heat source drying method in which a kneaded mixture produced by adding a binder-containing additive and water to carbon powder and kneading the mixture is formed into a rod-shaped carbon heat source and the carbon heat source is subsequently dried to manufacture a finished product, characterized in that the method comprises:
generating a dry atmosphere in which an evaporation rate at which the water evaporates through an outer surface of the carbon heat source is made approximately equal to a speed at which the water in the carbon heat source moves from a center thereof toward the outer surface while a weight absolute humidity is lowered in a stepwise manner; and drying the carbon heat source in the dry atmosphere.

2 . The carbon heat source drying method according to claim 1 ,
characterized in that the drying of the carbon heat source is carried out in a plurality of drying stages in accordance with a changing degree of dryness of the carbon heat source, and between adjacent drying stages, at least one of a dry bulb temperature and a relative humidity of the dry atmosphere is changed.

3 . The carbon heat source drying method according to claim 2 ,
characterized in that the dry bulb temperature and the relative humidity of the dry atmosphere in each of the drying stages are so determined. as to maintain a transverse cross-sectional shape of the carbon heat source irrespective of the changing degree of dryness of the carbon heat source.

4 . The carbon heat source drying method according to claim 2 ,
characterized in that the dry bulb temperature in a first drying stage of the drying stages is set at a value greater than or equal to the dry bulb temperatures in the subsequent drying stages.

5 . The carbon heat source drying method according to claim 4 ,
characterized in that the weight absolute humidity in each of the drying stages corresponds to at least 40% of the water content in the carbon heat source in the corresponding drying stage to which the carbon heat source has transitioned.

6 . The carbon heat source drying method according to claim 3 ,
characterized in that the dry bulb temperature in a first drying stage of the drying stages is set to be higher than or equal to the dry bulb temperatures in the subsequent drying stages.

7 . The carbon heat source drying method according to claim 6 ,
characterized in that the weight absolute humidity in each of the drying stages corresponds to at least 40% of the water content in the carbon heat source in the corresponding drying stage to which the carbon heat source has transitioned.

Assignees

• Japan Tobacco Inc

Inventors

• Sasaki Hiroshi
• Kobayashi Masaaki

Classifications

• F26B21/33

  Humidity · CPC title

• F26B21/35 Primary

  Temperature; Pressure · CPC title

• F26B25/22

  Controlling the drying process in dependence on liquid content of solid materials or objects · CPC title

• A24B15/165

  comprising as heat source a carbon fuel or an oxidized or thermally degraded carbonaceous fuel, e.g. carbohydrates, cellulosic material · CPC title

• F26B21/10 Primary

  Mechanical Engineering · mapped topic