What Does Automatic Mold Shifting Add to a Three-Color Melamine Molding Machine?
For bowls, plates, cups, and trays with three colors molded into the body, Han Chang’s three-color melamine tableware molding machine combines three material charges, three pressing stages, and three upper molds in one press. The partly formed article stays in the same lower mold while the machine moves the required upper mold into position. The operator does not have to carry an unfinished part to another press and reposition it between stages.
Machine features—and what they mean for your factory
| Machine design | Practical production benefit |
|---|---|
| One lower mold, three upper molds | Keep three pressing stages in one press, avoiding transfer and repositioning between presses. |
| Automatic upper-mold shifting | Bring each upper mold into position in sequence, keeping manual charging and pressing organized. |
| Stored product recipes | Start repeat orders from established settings and reduce repeated parameter entry. |
| Single-, two- and three-color modes | Schedule standard and multi-color tableware on one machine with compatible tooling. |
Automatic mold shifting for a three-color melamine molding machine gives the equipment a clear production advantage: it keeps the three-color body-molding sequence at one workstation, supports consistent control of the color-zone position, and gives the factory a repeatable way to manage stage-specific settings. It is also available with single-, two-, and three-color operating modes, so a tableware producer can use one machine for a broader product mix when the tooling is compatible.
This is not a fully automatic line. Operators still charge the different colors of melamine molding compound at the three stages and remove the finished part. The machine automates the upper-mold change and controls the programmed pressing steps. This division of work is important when comparing a true triple-color melamine tableware molding machine with a standard press or a decorative process.
How do three upper molds work with one lower mold?
Compression molding normally uses heat and pressure to shape and cure a charge inside a closed mold. A general compression molding overview explains this heat-and-pressure principle. Han Chang’s three-color configuration extends the process into three coordinated body-color stages:
The upper molds change; the part stays in one lower mold
First color
Manually load the first color
Press with upper mold 1
Second color
Automatically shift upper mold 2 into position
Manually add color 2 and press
Third color
Automatically shift upper mold 3 into position
Manually add color 3 and complete pressing
- The operator places the first color of melamine molding compound into the lower mold, and the press completes the first stage.
- The partly molded article remains in the same lower cavity. The machine shifts the second upper mold into the working position, and the operator adds the second color.
- The machine shifts the third upper mold into position, the third color is charged, and the final pressing stage is completed.
- The operator removes the molded article. Decal, glazing powder, edge finishing, and other downstream work are arranged according to the product process.
The mold set must be engineered as a complete system. The three upper molds and the common lower mold have to match the intended color zones, boundary geometry, venting, flash control, and release path. A standard single-color mold does not become a three-color mold simply because it is installed on this press.
Four practical benefits of automatic upper-mold shifting
1. Three pressing stages stay at one workstation
Keeping the developing part in one lower mold removes the need to move it among three separate presses. Charging, mold shifting, pressing, and part removal can be organized around one working position. This simplifies the operator’s route and gives the factory a clearer standard procedure for a three-stage product.
2. The part position remains continuous across the color stages
Because the part is retained in the same lower cavity, one major source of variation—manual transfer and repositioning between presses—is avoided. The machine then brings the corresponding upper mold to that fixed part position. This design supports more consistent management of the color boundaries.
It does not guarantee a perfect boundary by itself. The result still depends on the mold interface, charge weight, charge placement, venting, compound behavior, and the pressure and temperature settings at each stage. Automatic mold shifting controls the tool position; the mold and process recipe still control how the colored compounds meet.
3. Stage-specific settings can be stored with the product recipe
A three-color body is not made by repeating one press cycle three times. Each stage may require its own pressure, temperature, venting, dwell, and mold-shift settings. Han Chang’s control system can store product setups, allowing repeat orders to start from an established recipe rather than from a blank entry.
Stored settings reduce repeated data entry and help operators avoid missing a stage value. They are a production baseline, not an automatic approval. A change in compound batch, mold condition, insert, color layout, or product geometry still requires first-piece verification and adjustment.
4. One press can cover single-, two-, and three-color modes
The machine can be selected for single-color, two-color, or three-color operation. This is valuable for factories that sell both standard tableware and differentiated multi-color lines. The investment case is therefore broader than “adding a third color.” It can provide one platform for several molded-body color plans.
Mode selection does not mean every existing mold is automatically interchangeable. Upper-mold mounting, lower-mold size, daylight, stroke, heating layout, and part-removal clearance must be checked for each tool. One press switching among products also cannot produce those products in parallel like multiple dedicated lines.
What products are a good fit?
A three-color melamine tableware moulding machine is suitable when the colors are formed as part of the melamine body, including:
- bowls, plates, and trays with separate upper, lower, or rim color zones;
- cups, dishes, and trays with three structural body-color areas;
- tableware ranges that alternate between single-, two-, and three-color products;
- repeat products that benefit from saved stage and mold-shift settings.
A logo, fine line, photograph, or complex artwork is usually a different decision. Those features may be better handled with a decal or another surface-decoration process instead of adding a molded body layer. Read Three-Color Melamine Body Layers vs. Decal Decoration before defining how many structural color zones the press and mold must actually form.
Selecting HCMT-150 through HCMT-400: force is only one part of the decision
Han Chang offers HCMT-150, HCMT-200, HCMT-300, and HCMT-400 configurations. The model number identifies the main pressing-force class, but buyers should not select a machine by tonnage alone. A complete review should cover:
- the dimensions, weight, and mounting method of all three upper molds and the lower mold;
- the travel and safe clearance needed for automatic upper-mold shifting;
- platen contact area, daylight, cylinder stroke, and part-removal height;
- cavity count, projected area, required molding load, and venting conditions;
- the operator’s three charging positions, working height, mold-change access, and maintenance clearance;
- whether RF preheating, decal or glazing stages, and trimming can keep pace with the press.
This is why Han Chang reviews the product drawing or sample, material, target mold, and production method before recommending a configuration. A plate diameter or “three colors” alone is not enough to determine the right press.
The machine is also designed with top-side maintenance access and standardized hydraulic and electrical components to support routine inspection and service. That is a maintainability benefit, not a claim that the machine cannot fail or that maintenance frequency will automatically decrease. Actual service requirements depend on operating conditions, preventive maintenance, and component condition.
Which factories gain the most from this machine?
Han Chang’s three-color melamine molding machine is a strong choice for a factory that plans to mold three distinct body-color zones in bowls, plates, cups, or trays, wants to complete the three pressing stages in one press, and still needs the option to run one- or two-color products. It is especially relevant for producers developing differentiated tableware collections, repeating established color combinations, or seeking to avoid moving partly molded parts between presses.
A factory making only single-color bodies for the foreseeable future may be better served by a simpler press. If the third visible color is only printed artwork, a decoration process may be the more economical route. The correct investment starts with the product’s molded color zones, tool concept, and order mix—not with buying unused mechanisms just because a product is described as “three-color.”
What should you send for a quotation?
To evaluate an HCMT-150 to HCMT-400 configuration, send the product photo or 3D drawing, dimensions and weight, the boundary of each molded color zone, compound information, intended cavity count, available or proposed mold data, decal or glazing requirements, target output, and factory space. Han Chang can then review how the three upper molds, common lower mold, automatic shifting system, and upstream and downstream equipment should work together.
View the Three-Color Melamine Tableware Molding Machine, compare the Melamine Tableware Molding Equipment range, or contact Han Chang for machine, mold, and quotation planning.
