Abstract: A recording paper used for an electrophotographic system is provided, wherein, in a gas chromatograph generated using a headspace method by holding two pieces of the paper of dimensions about 1 cm×about 1 cm at about 120° C. for about 3 minutes, the quantity of aldehyde compounds generated having a straight-chain alkyl chain of about 5 to about 20 carbon atoms is equivalent to a peak surface area ratio of no more than about 65% and a peak surface area of no more than about 40,000.

Abstract: A recording paper used for an electrophotographic system is provided, wherein, in a gas chromatograph generated using a headspace method by holding two pieces of the paper of dimensions about 1 cm×about 1 cm at about 120° C. for about 3 minutes, the quantity of aldehyde compounds generated having a straight-chain alkyl chain of about 5 to about 20 carbon atoms is equivalent to a peak surface area ratio of no more than about 65% and a peak surface area of no more than about 40,000.

Abstract: The invention provides an apparatus for checking glue application state of almost electrically non-conductive object to which an electrically conductive glue is applied on either side thereof, including (a) an electrode for transmitting high frequency therefrom, (b) a pair of receiving electrodes each spaced from the high frequency transmitting electrode at its opposite sides, (c) a detector head for aligning distal ends of the electrodes at almost the same level and shielding the electrodes from one another, (d) a high frequency generator for supplying high frequency to the high frequency transmitting electrode, (e) a gluing condition detector for detecting gluing condition of the object on the basis of a difference in output between the receiving electrodes, and (f) a position adjuster for adjusting relative position between a glue applied to the object and each of the electrodes.

Abstract: A glue applicator nozzle and an electrode are placed facing each other, with a gluing object between. The applicator nozzle is connected to a high-frequency-wave transmitter unit, while the electrode is bound to a high-frequency-wave receiver unit. The glue is discharged from the applicator nozzle, and applied on the gluing object, so that the state of continuous presence of glue between the applicator nozzle and the gluing object enables the transmission of the high-frequency wave between them for monitoring the desired performance of gluing process. In an alternate arrangement the electrode is set on the side of the applicator nozzle, and facing the glue applied on the gluing object.

Abstract: In an automatic gas pressure welding system wherein a couple of steel members are butted, the butted section is subjected to heating in a pressed state, to thus cause the steel members to be subjected to pressure welding. The pressing and heating periods are controlled in conformity with the amount of contraction of the heated section of the steel members.

Abstract: In an automatic gas pressure welding system wherein a couple of steel members are butted, the butted section is subjected to heating in a pressed state, to thus cause the steel members to be subjected to pressure welding. The pressing and heating periods are connected in conformity with the amount of contraction of the heated section of the steel members.