Abstract: A fluororesin including a residue unit of formula (1) and having a haze value equal to 2% or less of a heat-press molded product (thickness 1 mm) with a small haze value of a melt-molded product and a method for producing the same, Rf1, Rf2, Rf3 and Rf4 each independently represent one of the groups consisting of a fluorine atom, a linear perfluoroalkyl group having 1 to 7 carbon atoms, a branched perfluoroalkyl group having 3 to 7 carbon atoms, and a cyclic perfluoroalkyl group having 3 to 7 carbon atoms, the perfluoroalkyl group may have an ethereal oxygen atom, Rf1, Rf2, Rf3 and Rf4 may be linked to each other to form a ring having 4 or more and 8 or less carbon atoms, and the ring may include an ethereal oxygen atom.

Abstract: The present invention relates to resin particles including a residue unit represented by the following general formula (1) and having a volume average particle diameter equal to or more than 5 ?m and equal to or less than 2008 ?m, and a method for producing thereof. Fruthermore the present invention relates to a fluororesin comprising a residue unit represented by a general formula (1) and having a weight average molecular weight Mw in a range of 5×104 to 3×105, and a yellow index of a heat-melted molded product (thickness 3 mm) after 24 h at 280° C. of equal to or less than 6, and a method for producing thereof. In the formula (1), Rf1, Rf2, Rf3, and Rf4 are each independently one of the groups consisting of a fluorine atom, a linear perfluoroalkyl group having 1 to 7 carbon atoms, a branched perfluoroalkyl group having 3 to 7 carbon atoms, or a cyclic perfluoroalkyl group having 3 to 7 carbon atoms. The perfluoroalkyl group may have an ethereal oxygen atom.

Abstract: An object is to improve strength of a component after fused. A composite material fusion method is a method for fusing a first composite material, which is a composite material made of a thermoplastic resin and fibers, and a second composite material, which is a composite material made of a thermoplastic resin and fibers. The method includes: providing a thermoplastic resin film between a first fusion surface that is a surface to be fused of the first composite material and to which a machine processing has been applied and a second fusion surface that is a surface to be fused of the second composite material; heating the first and second composite materials with the resin film being provided between the first and second fusion surfaces; and pressing the first composite material and/or the second composite material with the resin film being provided between the first and second fusion surfaces.

Abstract: Provided are a welding device and a welding method that can realize efficient welding in terms of time and in terms of energy. The embodiment includes: a first graphite heater 110 and a second graphite heater 120 that come into contact with a first member 210 and a second member 220; and a first die 130 and a second die 140 that interpose the first and second graphite heaters 110, 120 between each of the first and second members 210, 220 and each die. The first and second graphite heaters 110, 120 have graphite sheets 114, 124 that generate heat by electric power, insulating materials 113, 123, outer covers 111, 121, and inner covers 112, 122 and are configured such that structures of the graphite sheets 114, 124 and the insulating materials 113, 123 interposing the graphite sheets are interposed between outer covers 111, 121 and inner covers 112, 122.