Ngk Insulators, Inc.

Takeyuki Ishii

Yuji Asai

Yoshimasa Kondo

Yukinari Shibagaki

Makoto Nakajo

Eiji Ito

Tsutomu Hirota

An undried honeycomb formed bodyis subjected to high-frequency heating in an atmosphere where humidity and temperature are maintained at 30 to 65% and 75 to 130&#xb0; C., respectively, such that 50 to 99 mass % of water contained in the undried honeycomb formed bodyis evaporated at the end of high-frequency heating, whereby the amount of water vaporized from the outer part of the undried honeycomb formed bodyis increased, thereby reducing a difference between amount of water vaporized from the inner part of the undried honeycomb formed bodyand that of water vaporized from the outer part thereof as well as reducing a difference between drying degree of the inner part of the undried honeycomb formed bodyand that of the outer part thereof, thereby producing a dried honeycomb formed bodyin which deformation of the partition walls is suppressed. The invention provides a honeycomb formed body drying method which prevents deformation of partition walls of the honeycomb formed body during drying thereof.

Method and apparatus for drying honeycomb formed body

The invention provides a honeycomb formed structure drying method including causing undried honeycomb formed structuresplaced on standsto pass through a drying apparatus, thereby drying the undried honeycomb formed structures through high-frequency heating, to thereby form dried honeycomb formed structures; removing the dried honeycomb formed structuresfrom the stands; cooling the standswhich have been heated dried in the drying apparatusare cooled to a temperature lower than the gelation temperature of the undried honeycomb formed structures; placing newly formed undried honeycomb formed structureson the cooled stands; drying the undried honeycomb formed structures by passing through the drying apparatus; and repeating these operations. The honeycomb formed structure drying method prevents deformation such as warpage of partition walls of honeycomb formed structures during drying thereof.

Method for drying honeycomb formed structure

An apparatus for molding a honeycomb structure provided with an extruder for the honeycomb structure capable of extruding a honeycomb structure in the gravity direction or an oblique direction at an angle of smaller than 30&#xb0; with the gravity direction and at least one cradle, said apparatus being provided with a means of being able to place the honeycomb structure extending in length with progress of extrusion on the cradle with cell opening end faceof the honeycomb structure being pressure contacted with the cradle under a pressure smaller than the compressive strength at the end face and then to move the cradle at a speed capable of keeping the pressure contact state and in the same direction as the lengthwise direction of the honeycomb structure.

Equipment and method for manufacturing honeycomb structural body

An apparatus for producing a honeycomb structure having an extruder, at least one cradle and a cutting device comprising a small-gage wire for cutting the honeycomb structure and a notching member; said cradle is provided with a means capable of moving the honeycomb structure extruded from the extruder in the lengthwise direction of the honeycomb structure at nearly the same speed as the extrusion speed of the honeycomb structure, said cutting device is constructed so that the cutting small-gage wire is moved to the honeycomb structure side on the same plane as the plane of stretched small-gage wire, a cutting induction groove is formed on the outer peripheral side surface of the honeycomb structure by the notching member, and immediately thereafter the cutting small-gage wire is positioned in the induction groove, and the cutting small-gage wire is pressed into the honeycomb structure to cut the honeycomb structure.

Apparatus for molding a honeycomb structure

The method includes the steps of preparing a die main body; performing batch supply hole machining with respect to one principal plane of the die main body to form batch supply holes; using a cutting apparatus to perform slit machining with respect to the other principal plane of the die main body to form slits; without removing the cutting apparatus from the die main body, continuously performing lateral hole machining to form the batch bold portions, which are arranged at least at intersecting portions in the die main body between the batch supply holes and the slits and are arranged corresponding to the slits; and there after removing the cutting apparatus from the die main body to thereby form an integral die. Alternatively, the above slit machining and continuously performing lacteral hole machining steps can be performed first and followed by performing the batch supply hole machining step.

Growing community of inventors

Nagoya, Japan

Takeyuki Ishii