12 Colors Dispensing Machine: Working Principle

A 12 colors dispensing machine is automated equipment designed to dispense multiple colors of liquid materials-typically PVC plastisol or liquid silicone-into molds or onto substrates in a single production cycle. With twelve independent material channels, it enables efficient multi-color production for soft PVC and silicone products without the need for manual color changes between cycles.

This article explains what the machine is, how it works, and the core principles that govern its operation.

What Is a 12 Colors Dispensing Machine?

A dispensing machine, also called a dripping machine or dispensing robot, is specialized equipment that controls the flow of liquid materials and precisely deposits them into molds. When configured with twelve color channels, the machine can produce multi-colored products with complex patterns and layered color schemes that would be impractical or impossible to achieve through manual dispensing.

These machines are widely used in the production of soft PVC and silicone products, including keychains, badges, garment labels, phone cases, luggage tags, promotional gifts, and molded toys. The 12-color configuration represents a common mid-to-high range offering, providing sufficient color capacity for most multi-color product designs while maintaining a manageable footprint and cost.

The core value of a 12-color machine lies in its ability to handle complex multi-color designs automatically. A single operator can manage multiple machines simultaneously, significantly reducing labor costs compared to manual dispensing.

Core Working Principle

The working principle of a 12 colors dispensing machine can be understood through five key stages: production file creation, material preparation, coordinate positioning, controlled dispensing, and layer formation.

Stage 1: Production File Creation

The product design is first converted into a machine-readable program. This program defines the dispensing paths, coordinates, colors, and sequence required for the product. Modern machines support programming via computer or teach pendant, allowing the same design to be reproduced repeatedly without manual marking.

The software typically accepts standard file formats or CAD designs, enabling efficient replication of a single design across the entire workbed.

Stage 2: Material Preparation and Supply

Each of the twelve color channels is loaded with a different liquid material, typically PVC plastisol or liquid silicone. These materials are stored in separate containers or barrels and fed through individual delivery systems.

Maintaining stable material flow is critical. Variations in viscosity, temperature, or pressure can affect the amount of material dispensed and lead to inconsistency. The working table of many machines includes heating functionality to maintain proper material flow characteristics.

Stage 3: Coordinate Positioning and Motion Control

The dispensing head moves along programmed X, Y, and Z coordinates. The X and Y axes control the horizontal dispensing path, while the Z axis controls the dispensing height.

This motion is driven by servo motors and precision ball screws, providing the accuracy needed for multi-color work. Repeat positioning accuracy of ±0.01 mm to ±0.02 mm is common in quality machines, ensuring that each color is deposited in precisely the correct location across production cycles.

The X, Y, and Z axis positioning accuracy is typically around 0.05 mm per 400 mm of travel, with repeat positioning accuracy of ±0.02 mm.

Stage 4: Controlled Dispensing

When the dispensing head reaches the programmed position, the machine releases a controlled amount of material. The dispensing action is driven by compressed air or motorized valve systems.

The fundamental mechanism involves compressed air entering a material container and pushing the liquid into a feed tube connected to a piston chamber. When the piston moves upward, the chamber fills with material. When the piston pushes downward toward the dispensing needle, the material is expelled from the nozzle. The volume dispensed is determined by the downward stroke distance of the piston.

Modern 12-color machines achieve dispensing material error of ≤±1% and minimum dispensing volumes as low as 0.01 ml. This precision helps control material consumption and reduce waste.

Stage 5: Layer Formation and Curing

After one layer or color is dispensed, the material is typically heated and stabilized before additional colors or layers are applied. This process may be repeated until the complete multi-layer, multi-color structure is formed.

This layer-by-layer approach enables manufacturers to create raised edges, three-dimensional logos, and detailed patterns. The heating and curing steps ensure that each layer solidifies properly before the next is applied, maintaining the integrity of the final product.

Key Components of a 12 Colors Dispensing Machine

The machine consists of several integrated systems working together:

Material Supply System: Twelve separate containers, each holding a different color material, with individual feed lines to the dispensing head.

Dispensing Head Assembly: Contains the dispensing valves and needles. In multi-color machines, each color typically has its own dedicated dispensing channel, preventing cross-contamination between colors.

Motion System: The X, Y, and Z axes with servo motors, linear guides, and ball screws that position the dispensing head precisely. A typical 12-color machine has an X-axis stroke of 550 mm, Y-axis stroke of 360 mm, and Z-axis stroke of 100 mm.

Control System: The computerized brain of the machine, which stores production programs, coordinates the motion system, and controls the opening and closing of dispensing valves according to the programmed sequence.

Frame and Work Table: Provides structural support. The work table is typically 620 × 370 mm, accommodating multiple molds or large-format products.

Technical Specifications Overview

Note: Specifications vary by manufacturer and model. Custom configurations are available.

Why Multi-Color Capability Matters

In multi-color production, each color must be placed in its correct area of the mold. If the dispensing position shifts between production cycles or between colors, several problems can occur:

Color misalignment between layers

Uneven borders or edges

Inconsistent product details

Material overflow into adjacent color zones

Increased rework and material waste

This is why repeat positioning accuracy is an important specification for multi-color dispensing machines. This level of precision ensures that the machine returns to the same programmed position consistently, maintaining color registration across thousands of cycles.

Additionally, having twelve colors loaded simultaneously eliminates downtime for color changes mid-cycle, which is essential for detailed patches or labels.

Summary

The 12 colors dispensing machine provides a practical balance between color capacity, production efficiency, and equipment cost. By combining precise motion control, twelve independent color channels, and programmable operation, it enables manufacturers to produce complex multi-color products consistently and at scale.