A toner for developing an electrostatic charge image contains toner particles containing an amorphous resin and a crystalline resin. The ratio Qs1/Qf1 is 1.1 or more and 2.0 or less, where Qf1 is the total area of all endothermic peaks detected during the first temperature rise when the toner particles are analyzed by differential scanning calorimetry after one-day storage under 50 C. conditions, and Qs1 is the total area of all endothermic peaks detected during the first temperature rise when classified toner particles are analyzed by differential scanning calorimetry after one-day storage under 50 C. conditions. The classified toner particles are a fraction of the toner particles in which toner particles having a diameter equal to or larger than the volume-average diameter D50v of the toner particles constitute 10% by number or less.

A toner producing apparatus including: a foreign matter separating unit including a foreign matter separating chamber for separating metallic foreign matters contained in raw powder material of toner from the raw powder material of toner by using gravity, a feeding pipe connected to the foreign matter separating chamber so as to feed the raw powder material of toner into the foreign matter separating chamber, and an exhausting pipe connected to the foreign matter separating chamber so as to exhaust the raw powder material of toner from the foreign matter separating chamber; and a pulverizing unit including a rotor, the pulverizing unit being connected to the exhausting pipe of the foreign matter separating unit.

A cartridge provides comprising: a toner, a developing roller, a supply member and a regular member. The supply member abuts the surface of the developing roller and the regulating member serves to regulate the toner carried on the surface of the developing roller. The cartridge includes a first supply electrode to which a voltage is supplied from outside of the cartridge, with the supply member and the regulating member electrically connected to the same first supply electrode. Additionally, the toner contains a compound A having a structure represented by Formula (1) below,
(CH.sub.2CH.sub.2O)(1) where, when compound A is eluted in methanol a supernatant containing compound A is analyzed by liquid chromatograph ESI/MS, a specific peak of which an average m/z is 300 to 1000 exists.

A developer mix formulation having tribocharge uniformity across varying temperature and humidity conditions is provided. A developer mix used in a dual component development (DCD) system is a mixture of toner particles and magnetic carrier particles. Tribocharge uniformity is achieved in the developer mix by using magnetic carrier particles having surface additives on its surface. Surface additives include but are not limited to silica, titania and alumina.

A toner manufacturing method includes a first step of filtering toner particles obtained by a wet manufacturing method, a second step of squeezing the toner particles and making water pass through the toner particles, and a third step of squeezing the toner particles and ventilating compressed air through the toner particles, in which Condition (1) and Condition (2) are satisfied, Condition (1): a temperature T of the water passing through the toner particles in the second step satisfies 10 C.T35 C.; and Condition (2): a squeezing pressure P1 in the second step and a squeezing pressure P2 in the third step satisfy 0.2 MPaP1<P20.8 MPa.

A toner collecting device including: a centrifugation cylinder configured to be introduced with an airflow containing a toner and configured to centrifugally separate the toner; an airflow inlet; an airflow outlet; a toner collector that is located at a lower end of the centrifugation cylinder configured to collect the toner separated in the centrifugation cylinder; and a suction unit configured to suction an inside of the centrifugation cylinder through the toner collector and comprising a filtration filter configured to filter out the toner. The ratio of a suction quantity QBD (m.sup.3/min) of the airflow suctioned to an introduction quantity Qin (m.sup.3/min) at which the airflow containing the toner is introduced is more than 0% and 30% or less. The ratio of a filtration area (m.sup.2) of the filtration filter to the suction quantity QBD (m.sup.3/min) of the airflow suctioned is 0.4 or more and 4.0 or less.

A method for producing a toner includes collecting a toner by using a toner collecting device including: a centrifugation cylinder to which an airflow containing a toner is introduced and in which the toner is centrifugally separated by a swirling flow caused by the introduced airflow; an airflow inlet through which the airflow containing the toner is introduced to the centrifugation cylinder; an airflow outlet that is located at an upper end of the centrifugation cylinder and through which the airflow from which the toner has been separated in the centrifugation cylinder is discharged; a toner collector that is located at a lower end of the centrifugation cylinder and in which the toner separated in the centrifugation cylinder is collected; and a suction unit that suctions the inside of the centrifugation cylinder through the toner collector and has a filtration filter through which the toner in the suctioned airflow is filtered out. The ratio of a suction quantity QBD (m.sup.3/min) of the airflow suctioned by the suction unit to an introduction quantity Qin (m.sup.3/min) at which the airflow containing the toner is introduced to the centrifugation cylinder is more than 0% and 30% or less. The ratio of a filtration area (m.sup.2) of the filtration filter to the suction quantity QBD (m.sup.3/min) of the airflow suctioned by the suction unit is 0.4 or more and 4.0 or less.

The subject toner includes a toner particle containing a binding resin and an inorganic oxide particle, wherein the inorganic oxide particle is a particle of an oxide containing at least one element selected from the group consisting of: Si; Mg; Al; Ti; and Sr, wherein, when an area of the inorganic oxide particle is represented by Sm and a sectional area of the toner is represented by St in a cross-section of the toner observed with a transmission electron microscope, Sm/St is 4.0% or more, wherein an area Sm of the inorganic oxide particle that occupies each of four regions obtained by dividing the cross-section of the toner by a long diameter of the toner and a perpendicular bisector of the long diameter has a standard deviation of 0.40 or more in the observed cross-section, and wherein the toner has an average circularity of 0.950 or more.

An electrostatic charge image developing toner contains toner particles that contain an amorphous polyester resin and a styrene-(meth)acrylic resin, in which the toner particles have a spherical domain A of the styrene-(meth)acrylic resin, that is insoluble in tetrahydrofuran, and a spherical domain B of the styrene-(meth)acrylic resin, that is soluble in tetrahydrofuran, a glass transition temperature Tg1 of the spherical domain A of the styrene-(meth)acrylic resin is 0 C. or higher and 35 C. or lower, and in a case where a glass transition temperature of the spherical domain B of the styrene-(meth)acrylic resin is denoted by Tg2, a value of Tg2Tg1 is 20 C. or higher and 55 C. or lower.