Hair Dye Cosmetics

Key Equipment: Vacuum Emulsifier / (Jacketed) Mixing Tank

1. Overview

This document describes the process flow and equipment configuration of the hair dye cosmetics production line, focusing on the line layout built around the core emulsifying equipment — the Vacuum Emulsifier / (Jacketed) Mixing Tank.

Hair dye cosmetics (such as oxidative hair dye creams and hair color emulsions) are usually formed into creams or emulsions by emulsifying the oil phase, water phase and dye components (color developers, couplers). The core process is to homogenize and emulsify the oil phase and the water phase (containing dyes) in the emulsifying equipment, forming a stable and uniform hair dye cream. The performance of the emulsifying equipment directly affects the dispersion uniformity of the dyes, the fineness of the cream and the coloring effect, and is the key link of the whole production line.

• ▪Scope: cream and emulsion hair dye cosmetics (oxidative hair dyes etc.);
• ▪Core equipment: Vacuum Emulsifier / (Jacketed) Mixing Tank;
• ▪Production mode: intermittent batch production;
• ▪Supporting processes: weighing & batching, oil-phase/water-phase preparation, emulsification, cooling, aging, filling and packaging.

2. Overall Composition of the Production Line

By material flow, the hair dye cosmetics production line is divided into four functional zones — pretreatment, emulsification, post-treatment, and filling & packaging — organized around the core emulsifying equipment (Vacuum Emulsifier / (Jacketed) Mixing Tank):

Materials flow sequentially from the pretreatment zone into the emulsification zone, post-treatment zone and filling & packaging zone, forming a continuous, closed and traceable production flow.

3. Process Flow and Step Description

The typical process flow of hair dye cosmetics is: raw material inspection → weighing & batching → (oil-phase preparation and water-phase preparation in parallel) → vacuum emulsification → cooling → aging → intermediate inspection → filling → packaging → finished product inspection & warehousing. Each step is described as follows:

Note: The steps marked with ★ in the table (oil-phase temperature, water-phase temperature and emulsification) are key process control points, among which emulsification is the core control link of the whole production process.

4. Core Equipment: Vacuum Emulsifier / (Jacketed) Mixing Tank

The Vacuum Emulsifier (also called vacuum homogenizing emulsifier) is the core equipment of the hair dye cosmetics production line. Its main body is a mixing tank with a heating/cooling jacket, integrated with a vacuum system, a homogenizing emulsifying head and a wall-scraping stirring device, combining heating, emulsification, homogenization, defoaming and other functions in one unit, ensuring uniform dispersion of the dyes in the cream.

In the production line, the Vacuum Emulsifier / (Jacketed) Mixing Tank receives materials from the oil-phase pot and water-phase pot and completes emulsification under vacuum, heating and high-speed homogenization, producing a stable and fine hair dye cream, which then passes through cooling and aging into the subsequent filling and packaging processes.

Equipment Photos

Step 3 · Oil-phase preparation

Charge the oil-phase components into the jacketed oil-phase pot, heat and dissolve to the specified temperature and stir evenly

Oil Phase Tank & Water Phase Tank

Step 5 · Vacuum emulsificationCore Equipment

Emulsification of the oil phase and water phase (containing dyes), homogenization and vacuum defoaming — the key process that determines the quality of the hair dye cream and the coloring effect

Vacuum Emulsifier Mixing Tank

Step 7 · Aging/resting

Age in the aging tank to further stabilize the hair dye cream system

Aging Tank

Storage Tank

Step 9 · Filling

Quantitatively fill into packaging containers via the filling machine

Four-Head Filling machine

Step 10 · Packaging

Labeling, sealing, coding, cartoning

Capping Machine

Labeling Machine

Inkjet Printer

Supporting Equipment

RO Water System

Rotary Lobe Pump

5. Process Flow Diagram

The figure below shows the production process flow of hair dye cosmetics. The core equipment highlighted in orange, the “Vacuum Emulsifier / (Jacketed) Mixing Tank”, sits at the emulsification step after oil-phase and water-phase preparation, and is the key equipment of the whole line.

Figure: Process flow of hair dye cosmetics (★ key equipment: Vacuum Emulsifier / (Jacketed) Mixing Tank; labeled in both Chinese and English)

6. Key Quality Control Points

• ▪Key process control points: oil-phase temperature, water-phase temperature and the emulsification step are all key process control points and must be strictly monitored;
• ▪Temperature control: the oil phase and water phase must be heated to the specified temperature and kept consistent; temperatures in the emulsification and cooling stages must be precisely controlled;
• ▪Emulsification control: control the homogenizing time, rotation speed and vacuum degree to ensure uniform dye dispersion, a fine and stable cream, and no air bubbles;
• ▪Hygiene control: the emulsifying equipment and pipelines adopt a closed design and are cleaned and disinfected regularly to prevent microbial contamination;
• ▪Inspection control: intermediate inspection is combined with finished product inspection; only qualified products may flow to the next process or be warehoused.