Abstract: The present invention provides a process for preparing a sintered body comprising as a basic component aluminum magnesium titanate represented by the composition formula: MgxAl2(1?x)Ti(1+x)O5 wherein the value of x is 0.1?x<1. The process comprises a step of sintering a formed product from a raw material mixture comprising 100 parts by weight, calculated on an oxide basis, of a mixture comprising a Mg-containing compound, an Al-containing compound and a Ti-containing compound at the same metal component ratio as the metal component ratio of Mg, Al and Ti in the above composition formula, and 1-10 parts by weight of an alkali feldspar represented by the composition formula: (NayK1-y)AlSi3O8 wherein the value of y is 0?y?1.

Abstract: The present invention provides a raw material composition for preparing a sintered body of aluminum titanate, the composition comprising (i) 100 parts by weight of a mixture comprising 40 to 50 mol % of TiO2 and 60 to 50 mol % of Al2O3, (ii) 1 to 10 parts by weight of an alkali feldspar represented by the formula: (NaxK1?x)AlSi3O8 (0?x?1), and (iii) 1 to 10 parts by weight of at least one Mg-containing component selected from the group consisting of a Mg-containing oxide with spinel structure, MgCO3 and MgO, and a process for preparing a sintered body of aluminum titanate comprising sintering a formed product prepared from the raw material composition at 1300 to 1700° C. According to the present invention, a sintered body of aluminum titanate having high mechanical strength and ability to be stably used at high temperatures, as well as its inherent properties of low coefficient of thermal expansion and high corrosion resistance, can be obtained.

Abstract: In order to provide a coating apparatus in which an edge can be fixed rigidly so as to apply a coating agent at a uniform thickness, edge units are provided which comprise edge support members and edges which are attached to the tips of the edge support members so as to slide on a flexible tape support member. The edge which is not disposed at both ends in the running direction of the flexible tape support member is fixed to the edge support member by an edge fixing member which is inserted in a direction from a bottom portion of the coating apparatus toward the edge. The edge is fixed so as to be pulled into a recessed section formed on the edge support member by the edge fixing member.

Abstract: In order to provide a coating apparatus in which an edge can be fixed rigidly so as to apply a coating agent at a uniform thickness, edge units are provided which comprise edge support members and edges which are attached to the tips of the edge support members so as to slide on a flexible tape support member. The edge which is not disposed at both ends in the running direction of the flexible tape support member is fixed to the edge support member by an edge fixing member which is inserted in a direction from a bottom portion of the coating apparatus toward the edge. The edge is fixed so as to be pulled into a recessed section formed on the edge support member by the edge fixing member.

Abstract: The present invention provides a process for preparing an aluminum-titanate-based sintered body comprising the step of firing, at 1250 to 1700° C., a formed product prepared from a raw material mixture containing 100 parts by weight of a mixture of TiO2 and Al2O3 in a weight ratio of TiO2:Al2O3=40:60 to 60:40, and 1 to 15 parts by weight of an alkali feldspar represented by the formula:(NaxK1-x)AlSi3O8 wherein 0≦x≦1.

Abstract: The present invention provides a process for preparing a raw material powder for producing a sintered body of aluminum titanate comprising: pulverizing a mixture containing: (1) 100 parts by weight of aluminum titanate crystals pulverized until a maximum grain size of 30 to 50 &mgr;m is attained; and (2) 2 to 6 parts by weight of spinel crystals obtained by heating a mixture containing MgO and Al2O3 at 1250° C. to 1290° a molar ratio of MgO to Al2O3 being 1:0.95 to 1:1.05, said pulverizing being conducted by wet grinding process with a ball mill or cylinder mill.

Abstract: A process for preparing a powder of aluminum titanate, including the steps of subjecting to pressure molding a mixture of 100 parts by weight of a mixture of Al2O3 and TiO2 at a molar ratio of the former: the latter of 1:0.95-1.05, 2 to 5 parts by weight of SiO2, 2 to 5 parts by weight of iron oxide calculated as Fe2O3 and 1 to 3 parts by weight of a powder of an organic substance; sintering the molded product at a temperature of 1600 to 1700° C. in a closed container; and pulverizing the molded product. A further process for preparing a sintered body of aluminum titanate includes the steps of molding the powder of aluminum titanate obtained by the above-mentioned process and sintering the molded product at 1450 to 1550° C.

Abstract: Removal of a coating, especially a thin coating such as a paint, formed on the surface of various structures, is conducted using a laser beam, based on coordinate data of an area being laser-fired and of a target area to be laser-fired. A projection spot of the laser beam partially and reciprocatingly rotates, and accurate control of removal is conducted in such a way as to match the area being laser-fired and the target area.

Abstract: A method for controlling a tufting machine in which a supply length of a ground fabric and a yarn feed length each for a unit stitch number are selected as control measures. Since the motion of a stitch shaft is steady and stable compared to that of a spiked roller, control in accordance with the present invention results in a stable operation of the tufted machine relative to the conventional method, in which the control measures are based on a unit supply length of the ground fabric. A yarn weight per square meter is also measured and indicated during the tufting operation.

Abstract: A weaving detector for detecting weaving defects generated on the surface of a ground fabric of a carpet or rug moving in a first direction is disclosed. The weaving detector moves in the direction of the width of the cloth and includes one or more detecting sensors spaced in the direction of the movement of the cloth. A guide sled is connected to the sensors and has upwardly curved ends so as to prevent the catching of a defect by the sled. The sensors only provide a defect signal when both sensors simultaneously detect a defect. The sensors are supported by upper and lower supports having vibration absorbing springs therebetween so that the electrical controls are not damaged by the vibrations.

Abstract: A method of controlling a tufting machine including preestablishing a selected stitch number and a selected yarn feed length for a predetermined unit feed length of ground fabric, determining stitch number and yarn feed length for the unit feed length of ground fabric by means of measured values respectively obtained from a ground fabric feed detector, a yarn feed detector and a stitch number detector, comparing the measured values with the preestablished stitch number and the preestablished yarn feed length, and automatically controlling the rotation speeds of a spiked roller and a yarn roller respectively to correct the ground fabric feed and the yarn feed to the preestablished values whenever the measured values depart from a predetermined tolerance from the selected values.