Abstract A method and means for drying moist material in which heat from a source of heat is supplied at least partially to one side of a porous layer, the pores of which are capable of conducting vapor. The moist material is in contact with the opposite side of the porous layer, so that due to the heat from the source of heat the moisture in said moist material is vaporized to vapor which thus is generated as a result of evaporation of moisture in said moist material and is at least partially forced into and through said porous layer in a direction opposite to that of the temperature gradient caused by heat supplied mainly by means of thermal conductivity from the source of heat to the porous layer through a homogeneous, heat-conducting wall. The wall is arranged in at least partial heat-conducting contact with the porous layer and defines a partition between the porous layer and the source of heat, blocking the passage of steam through said porous layer. The generated vapor is discharged in direction mainly perpendicular to said temperature gradient.
Drying means comprising a porous layer supported by a homogeneous blocking wall, said blocking wall being arranged to transfer heat from a heating source to said porous layer, and steam passages extending below the outer surface of said porous layer.
Claim 2
Dependent Claim
24 words
Drying means according to claim 2, wherein said porous layer and blocking wall are arranged as an outer cover on a rotatably mounted cylinder.
Claim 3
Dependent Claim
21 words
Drying means according to claim 2 wherein said passages have a larger cross-sectional area than the pores of said porous layer.
Claim 4
Dependent Claim
72 words
Means according to claim 2 wherein the porous layer is adapted for contact with a moist web to be dried and comprises sintered material, the composition of the porous layer being such that a surface facing the moist web consists of fine sintered material providing a smooth surface, whereas the interior of said porous layer consists of coarse sintered material to give less flow resistance to steam than said fine sintered material.
Claim 5
Dependent Claim
17 words
Means according to claim 2 wherein said means is used in combination with a flat ironing surface.
Claim 6
Dependent Claim
65 words
Drying means according to claim 2 comprising a cylinder for continuous drying of a moist web of material, said cylinder being journalled rotatably on shafts at least one of which shafts is arranged to supply heating medium, and wherein said passages are arranged to discharge water vapor generated from the moist web in a direction substantially perpendicular to a temperature gradient resulting from heat transfer.
Claim 7
Dependent Claim
37 words
Drying means according to claim 7 wherein at least portions of said passages are arranged to discharge the water vapor mainly in a direction parallel to the generatrix of the cylinder towards at least one end thereof.
Claim 8
Dependent Claim
26 words
Drying means according to claim 7 wherein at least portions of said passages are arranged to discharge the water vapor around the periphery of said cylinder.
Claim 9
Dependent Claim
45 words
Drying means according to claim 6 wherein some of said passages are arranged to discharge the water vapor in the direction of the generatrix of said cylinder and others of said passages are arranged to discharge the water vapor around the periphery of said cylinder.