Provided are a molding step (A) of preparing an alumina molded body 11 from a molding raw material which contains an alumina raw material powder having an average particle size of 2 m to 5 m and a molding additive, and a sintering step (B) of preparing an alumina molded body 12, which becomes a spark plug insulator 1, by sintering the alumina molded body 11. At the sintering step (B), the alumina molded body 11 is conveyed to a continuous furnace 100 provided with a heating zone Z1 which is heated to 700 C. to 1600 C. by a heating means 401, followed by introducing oxygen gas to control the heating zone Z1 to have a high oxygen atmosphere with an oxygen concentration exceeding 20 mol %.

A silicone resin is disclosed. The silicone resin is free from carbon atoms. A method of preparing the resin is additionally disclosed. This method comprises reacting a silane compound and a precursor compound, thereby preparing the silicone resin. A composition including the silicon resin and a vehicle is further disclosed. A method of preparing a film with the composition is also disclosed. This method comprises applying the composition including the silicone resin and the vehicle to a substrate to form a layer. This method also includes heating the layer to give the film.

A silicone resin is disclosed. The silicone resin is free from carbon atoms. A method of preparing the resin is additionally disclosed. This method comprises reacting a silane compound and a precursor compound, thereby preparing the silicone resin. A composition including the silicon resin and a vehicle is further disclosed. A method of preparing a film with the composition is also disclosed. This method comprises applying the composition including the silicone resin and the vehicle to a substrate to form a layer. This method also includes heating the layer to give the film.

The invention provides a cable assembly having a conductive element and a transmission cable. A strip-shaped opening slot is opened on the conductive element. The transmission cable is embedded in the opening slot. The transmission cable includes a substrate, a ground wire and a signal cable respectively provided on both sides of the substrate. The ground wire is exposed outside the opening of the opening slot. The signal cable is placed in the opening slot. The electronic device comprises the cable assembly described above. The cable assembly and electronic device of the present invention have the advantages of small size and good signal transmission performance. The cable assembly and electronic device of the present invention have the advantages of small size and good signal transmission performance.

The invention provides a cable assembly having a conductive element and a transmission cable. A strip-shaped opening slot is opened on the conductive element. The transmission cable is embedded in the opening slot. The transmission cable includes a substrate, a ground wire and a signal cable respectively provided on both sides of the substrate. The ground wire is exposed outside the opening of the opening slot. The signal cable is placed in the opening slot. The electronic device comprises the cable assembly described above. The cable assembly and electronic device of the present invention have the advantages of small size and good signal transmission performance. The cable assembly and electronic device of the present invention have the advantages of small size and good signal transmission performance.

The invention provides a cable assembly having a conductive element and a transmission cable. A strip-shaped opening slot is opened on the conductive element. The transmission cable is embedded in the opening slot. The transmission cable includes a substrate, a ground wire and a signal cable respectively provided on both sides of the substrate. The ground wire is exposed outside the opening of the opening slot. The signal cable is placed in the opening slot. The electronic device comprises the cable assembly described above. The cable assembly and electronic device of the present invention have the advantages of small size and good signal transmission performance. The cable assembly and electronic device of the present invention have the advantages of small size and good signal transmission performance.

A method of manufacturing a solid insulation member and an insulation member thereof are provided. The method of manufacturing the insulation member of the present invention includes manufacturing a 3D printing material using a mixed material in which one or more materials selected from among polycarbonate (PC), polybutylene terephthalate (PBT), acrylonitrile-butadiene-styrene (ABS), polyamide (PA), polyoxymethylene (POM), and polyethylene terephthalate (PET), one or more fillers selected from among TiO.sub.2, SiO.sub.2, and Al.sub.2O.sub.3, and a curing agent are mixed, and which contains different amounts of the fillers at predetermined intervals in a longitudinal direction, and sequentially stacking the manufactured 3D printing material using a 3D printer to thus manufacture a target insulation member so that the mixed material containing different amounts of the fillers at predetermined intervals in a longitudinal direction of the insulation member is sequentially stacked.

A method of producing a bent part from insulated flat material having a flat electrically conducting carrier material sheathed by an electrically insulating insulation layer includes feeding the insulated flat material from a material supply to a bending machine; in the bending machine, forming a two-dimensionally or three-dimensionally bent part bent from insulated flat material; severing the bent part in a cutting operation from the fed insulated flat material; and removing part of the insulation layer in an insulation-stripping operation from the electrically conducting carrier material in at least one portion of the insulated flat material, wherein the insulation-stripping operation on the flat material guided in the bending machine by an insulation-stripping installation that is integrated in the bending machine is carried out by a continuous method on the flat material running through the insulation-stripping installation prior to severing the bent part from the fed flat material.

A method for producing a composite element is provided. The method includes providing an outer frame comprising metal and having a first coefficient of thermal expansion in a first spatial direction and a second coefficient of thermal expansion in a second spatial direction, the first and second coefficient of thermal expansions differing from one another; providing an inner component comprising glass; heating the outer frame to an expanded state having the outer frame expanded with respect to the inner component in the first spatial direction in accordance with the first coefficient of thermal expansion and expanded along the second spatial direction in accordance with the second coefficient of thermal expansion; inserting the inner component in the outer frame when in the expanded state; and cooling the outer frame so that the outer frame contracts from the expanded state until the inner component is fitted in outer frame under compressive stress.

A method for producing a composite element is provided. The method includes providing an outer frame comprising metal and having a first coefficient of thermal expansion in a first spatial direction and a second coefficient of thermal expansion in a second spatial direction, the first and second coefficient of thermal expansions differing from one another; providing an inner component comprising glass; heating the outer frame to an expanded state having the outer frame expanded with respect to the inner component in the first spatial direction in accordance with the first coefficient of thermal expansion and expanded along the second spatial direction in accordance with the second coefficient of thermal expansion; inserting the inner component in the outer frame when in the expanded state; and cooling the outer frame so that the outer frame contracts from the expanded state until the inner component is fitted in outer frame under compressive stress.