Patent ID: 6538225
Filing Date: 2003-03-25
Classification: B01F,B01J,B21F

Abstract:
A method for manufacturing a packing made of a three-dimensional net-like structure which constitutes an internal structure of a device which performs material transfer, heat exchange or mixing between gases, liquids or gas and liquid, said internal structure being divided in a plurality of chambers or channels connected to one another and said three-dimensional net-like structure being formed by disposing a plurality of unit structures in vertical and horizontal directions, each of said unit structures being a combination of two quadruple pyramids having a common base and apexes which are directed in opposite directions, said apexes of the two quadruple pyramids and joints of two horizontally adjacent ones of said quadruple pyramids being formed by converging and dispersion of four line elements each of which is made of a wire or twine, and each of said line elements extending from the top of the packing to the bottom of the packing, said method comprising steps of:(A) disposing first line elements extending in parallel at a predetermined interval in a first direction on a plane and second line elements extending in parallel at a predetermined interval in a second direction which is different from the first direction on the same plane in such a manner that the first line elements cross the second line elements at a desired angle and the first and second line elements are laid one upon the other; (B) fixing the first line elements to the second line elements at crossing points thereof and thereby forming a net; (C) pressing the net to form a plurality of parallel undulating bulging portions which bulge at alternate ones of the crossing points continuously formed in the first direction and the second direction and thereby forming an undulating net; (D) laying a second layer of the undulating net upon a first layer of the undulating net in such a manner that the crossing points continuously formed in the first direction and the second direction of the first layer of the undulating net alternately come into contact with and separate from the crossing points continuously formed in the first direction and the second direction of the second layer of the undulating net and thereafter fixing together the crossing points of the first layer of the undulating net and the second layer of the undulating net which are in contact with each other; and (E) laying a third layer of the undulating net upon the second layer of the undulating net in such a manner that the crossing points continuously formed in the first direction and the second direction of the second layer of the undulating net alternately come into contact with and separate from the crossing points continuously formed in the first direction and the second direction of the third layer of the undulating net and thereafter fixing together the crossing points of the second layer of the undulating net and the third layer of the undulating net which are in contact with each other; and thereafter superposing a fourth, a fifth . . . and n-th, wherein n is any integer, layer of the undulating nets in the same manner and fixing together the crossing points of the respective layers of the undulating nets and the immediately lower layers of the undulating nets which are in contact with each other.