Overglaze vs. Underglaze Pad Printing: Which Is Best for Your Ceramics

Ceramic pad printing is widely used to decorate cups, bowls, plates, saucers, and other ceramic products with logos, patterns, and multicolor designs.

However, not all ceramic printing processes are the same. Two important decoration methods are overglaze printing and underglaze printing. Although both can use pad printing technology, they differ in printing stage, firing temperature, ink requirements, and final surface properties.

Understanding these differences can help ceramic manufacturers choose the right printing process, equipment, and consumables for their production needs.

Overglaze pad printing applies decorative patterns to the surface of ceramic products that have already undergone glaze firing.

The design is transferred onto the glazed ceramic surface using a silicone pad. The decorated product then undergoes an additional firing process to fix the ceramic decoration.

Typical Overglaze Printing Process

Overglaze decoration is commonly fired at approximately 600–900°C, depending on the ceramic pigment, glaze, and decoration requirements.

Because the decoration is fired at a lower temperature than many high-fired ceramic bodies, overglaze printing can accommodate a relatively wide range of decorative colors.

Advantages of Overglaze Printing

• Suitable for decorating already glazed ceramic products.
• Offers relatively flexible color options for decorative designs.
• Suitable for logos, decorative patterns, and multicolor applications.
• Can be integrated into a separate ceramic decoration stage.

Typical Applications

Overglaze printing can be used for decorative porcelain, ceramic mugs, promotional ceramic gifts, and branded ceramic products.

However, because the decoration remains on the glaze surface, its resistance to abrasion and repeated washing depends on the ceramic ink formulation, firing conditions, and final product quality.

Underglaze pad printing transfers decorative patterns onto an unglazed ceramic body before the final glazing process.

After printing, the ceramic product is covered with a suitable glaze and fired. The decoration becomes positioned beneath the glaze layer.

Typical Underglaze Printing Process

For many high-fired porcelain applications, firing temperatures are approximately 1200–1400°C, although lower-temperature ceramic systems also exist.

Underglaze ceramic pigments must be compatible with the selected glaze and withstand the required firing conditions.

Advantages of Underglaze Printing

• The decoration is protected beneath the glaze layer.
• Offers good potential for wear-resistant ceramic decoration.
• Produces a smooth, glazed surface over the printed pattern.
• Suitable for integration into ceramic manufacturing before final glazing.

Typical Applications

Underglaze printing is widely applicable to ceramic tableware, bowls, plates, saucers, and other products requiring decoration beneath a protective glaze.

The final printing result depends on ceramic pigment stability, glaze compatibility, firing conditions, and the quality of the printing process.

Selecting suitable printing ink is essential for both overglaze and underglaze ceramic printing.

Unlike conventional decorative inks used on plastics or metals, ceramic inks intended for firing must be compatible with the ceramic decoration and firing process.

Overglaze Printing Ink

Some overglaze pad printing applications require specially formulated ceramic inks.

Certain ceramic inks have a thick, paste-like consistency at room temperature. When thermoplastic ink systems are used, a heated ink tray or printing plate may be required to maintain suitable viscosity and ensure stable ink transfer.

• Ceramic pigment and glaze compatibility.
• Ink viscosity and transfer performance.
• Firing temperature requirements.
• Compatibility with heated printing equipment, when required.

Not all overglaze inks require heating. The ink formulation determines whether a heated system is necessary.

Underglaze Printing Ink

Underglaze printing can use ceramic-specific inks designed for room-temperature pad printing, depending on the formulation.

Suitable ink viscosity and pigment dispersion help achieve consistent ink pickup, release, and pattern definition.

For better compatibility, WINNEO recommends selecting underglaze ceramic inks that have been evaluated for the intended printing equipment and production process.

Even when an underglaze ink can be printed at room temperature, it must still be suitable for the subsequent glazing and firing process.

The right combination of ceramic ink, silicone pad, printing plate, and machine configuration is essential for consistent printing performance.

Choosing the most suitable process depends on your ceramic product and manufacturing workflow.

For ceramic tableware intended for food contact, the selected decoration method and finished product must also meet applicable safety and migration requirements.

In addition to selecting the printing process, ceramic manufacturers should evaluate several machine-related factors.

Number of Printing Colors

Single-color, two-color, and multicolor configurations can be selected according to the complexity of the artwork.

Printing Area and Product Dimensions

The machine's printing capacity and fixture design must match the size, shape, and printing position of the ceramic product.

Production Capacity

Required output, loading methods, and printing cycles should be evaluated according to actual production conditions.

Ink and Printing System Compatibility

Different ceramic inks may require different ink trays, printing plates, silicone pads, and temperature-control configurations.

Sample Printing

Testing with the actual ceramic product, artwork, and intended ink is recommended before confirming the machine configuration.

WINNEO provides ceramic pad printing equipment solutions for different decoration requirements, including single-color and multicolor printing applications.

Our ceramic printing solutions focus on:

• Suitable machine configurations for different printing requirements.
• Printing area and fixture matching.
• Silicone pad and printing plate selection.
• Ink compatibility evaluation.
• Sample printing and technical consultation.
• Customized equipment configurations for specific ceramic decoration processes.

For applications involving specialized ceramic inks, particularly thermoplastic ink systems, equipment compatibility should be evaluated before production.

With 20 years of experience in the pad printing consumables industry, WINNEO is a China-based source factory committed to providing professional printing solutions for manufacturers worldwide.

We understand that successful pad printing goes beyond the machine itself. Printing quality depends on the right combination of equipment, silicone pads, printing plates, ink systems, and application-specific configurations.

Why Choose WINNEO?