Abstract: A method for producing polytetrafluoroethylene, which includes polymerizing tetrafluoroethylene in an aqueous medium in the presence of a nucleating agent and a hydrocarbon anionic surfactant to obtain polytetrafluoroethylene. A total amount of the nucleating agent and the hydrocarbon anionic surfactant at the initiation of polymerization is more than 50 ppm based on the aqueous medium.

Abstract: An article (1) for thickening body fluids or excreta which contains a polysaccharide (10) capable of thickening in the presence of a polyvalent metal ion, the polysaccharide (10) being present in a state ready to dissolve or be dissociated in the moisture contained in body fluids or excreta.

Abstract: A disposable diaper (1) includes a liquid permeable topsheet (2); a liquid impermeable back sheet (3); an absorbent member (4) interposed between the topsheet and bottom sheet; a fastening tape (10) for securing the diaper (1); and a release tape (30) to which an adhesive surface of the fastening tape is to be adhered. A tensile load of the back sheet (3) at 3% elongation in the transverse direction of the diaper falls within the range of 100 to 300 g/cm. A bulk softness of the back sheet (3) is 55 g or less. A peel strength required to peel the fastening tape (10) from the back sheet at 180.degree. is 400 g/cm or less. The time required until the fastening tape (10) and the back sheet (3) are peeled from each other under a load of 500 g is 10 minutes or longer. An outer surface of the back sheet (3) is not provided with a target tape.

Abstract: An angle .theta. formed between a horizontal line passing through the contact point P and a slant surface of a mantle based on an empirical rule corresponding to the vertical distance L ranging from the reference line S to the contact point P of the mantle continued to vary due to abrasion is inputted in advance into an angle inputting and outputting device, the angle .theta. corresponding to the vertical distance L detected by a distance sensing device in reference to an angle inputted value is selected and at the same time the selected angle is inputted into the distance calculating device, a product of a distance difference .DELTA.L between the contact point P of the concave and the contact point P of the mantle and a cosine value of the angle .theta. is calculated by the distance calculating device, resulting in that an inputting operation for the angle .theta. can be eliminated, so that a stop time of the cone crusher is reduced and an operating efficiency of the cone crusher is improved.