Manufacturing method of toner particles

Patent metadata

Field	Value
Publication number	US-2023047900-A1
Application number	US-202217877744-A
Country	US
Kind code	A1
Filing date	Jul 29, 2022
Priority date	Aug 2, 2021
Publication date	Feb 16, 2023
Grant date	—

Abstract

A method of manufacturing toner particles, including a step of drying wet toner particles with a drying unit, the wet toner particles being obtained from an aqueous dispersion medium, wherein the drying unit includes a loop-type flash dryer in which the wet toner particles to be dried are supplied to a gas stream circulating in a loop-type drying pipe, the loop-type flash dryer includes: (i) a loop-type drying pipe; (ii) an inlet port for supplying wet toner particles to the loop-type drying pipe; (iii) an outlet port for discharging dried toner particles from the loop-type drying pipe; (iv) a first blowing port for blowing gas into the loop-type drying pipe; and (v) second blowing ports for blowing gas into the loop-type drying pipe.

First claim

What is claimed is:

1 . A method of manufacturing toner particles, comprising:
a step of drying wet toner particles with a drying unit, the wet toner particles being obtained from an aqueous dispersion medium, wherein the drying unit comprises a loop-type flash dryer in which the wet toner particles to be dried are supplied to a gas stream circulating in a loop-type drying pipe, the loop-type flash dryer comprises:
(i) a loop-type drying pipe;
(ii) an inlet port for supplying wet toner particles to the loop-type drying pipe;
(iii) an outlet port for discharging dried toner particles from the loop-type drying pipe;
(iv) a first blowing port for blowing gas into the loop-type drying pipe; and
(v) a second blowing port for blowing gas into the loop-type drying pipe,
the first blowing port is positioned upstream of the second blowing port with respect to a conveying path of the wet toner particles, when a gas flow speed of the gas supplied from the first blowing port is defined as A (m/s); a gas flow speed of the gas supplied from the second blowing port is defined as B (m/s); a gas flow rate of the gas supplied from the first blowing port is defined as C (m 3 /s); and a gas flow rate of the gas supplied from the second blowing port is defined as D (m 3 /s), the A, B, C and D satisfy the following formulae (1), (2) and (3):
4.5≤ A≤ 14.5  (1);

19.0≤ B≤ 38.5  (2); and

0.20≤ C /( C+D )≤0.60  (3), and

a temperature of a gas stream supplied from the first blowing port and a temperature of a gas stream supplied from the second blowing port are both 60° C. to 80° C.

2 . The method of manufacturing toner particles according to claim 1 , wherein the C and D satisfy the following formula (3)′:
0.40≤ C /( C+D )≤0.60  (3)′.

3 . The method of manufacturing toner particles according to claim 1 , wherein the loop-type flash dryer comprises a plurality of the second blowing ports.

4 . The method of manufacturing toner particles according to claim 1 , wherein the toner particles have a glass transition temperature (Tg) of 40° C. or more.

Assignees

• Canon Kk

Inventors

• Amano Shota
• Tsujino Takeshi
• Asaoka Junya
• Sasano Yuu
• Inoue Koki
• Yokoyama Toshiaki
• Kobayashi Masahiro

Classifications

• G03G9/0815 Primary

  Post-treatment · CPC title