Article and method of manufacturing the same

A method of manufacturing an article, comprising:

• providing a molding device, wherein the molding device includes a first mold, a second mold corresponding to the first mold, the first mold includes an inner wall and a supporting member protruded from the inner wall;
• providing a mixing unit configured to produce a first material and a second material, wherein the mixing unit includes a hollow mixing cartridge and a mixing rotor disposed in the hollow mixing cartridge, a length of the mixing rotor extends along a length of the hollow mixing cartridge, and the mixing rotor is immovable in a direction parallel to the longitudinal axis of the hollow mixing cartridge, a ratio of a shortest distance between an inner sidewall of the hollow mixing cartridge and the mixing rotor to a diameter of the mixing rotor is in a range of about 1:1500 to about 1:4500;
• providing a discharging channel communicable with the mixing unit configured to discharge the first material and the second material from the mixing unit;
• disposing a core on the supporting member, wherein the core includes a first surface, a second surface opposite to the first surface, and a sidewall between the first surface and the second surface;
• engaging the second mold with the first mold to form a mold cavity defined by the first mold and the second mold, wherein the core is disposed within the mold cavity;
• injecting the first material into the mold cavity;
• foaming the first material to form a first foamed member, wherein the first foamed member covers a first portion of the first surface, the entire sidewall and the entire second surface of the core;
• retracting the supporting member into the first mold or removing the supporting member from the mold cavity during or after the injecting the first material to expose a second portion of the first surface through the first foamed member;
• forming a mark at a position on the first foamed member corresponding the position of the supporting member;
• and
• injecting the second material into the mark to form a second foamed member at the second portion of the first surface,
• wherein the second foamed member is separated from the sidewall and the second surface of the core, and the core is surrounded by the first foamed member and the second foamed member, and the mark is recessed from an outer surface of the first foamed member.