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PAD PRINTING (OR TRANSFER (DIAL PRINTING))

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1. General description

Pad printing, or transfer (dial printing), is a printing method used to apply graduations, numerals, logos, or graphic elements onto the dial, discs, crystals, or even other components of a watch (Movement components Movement). This printing technique allows for great precision in transferring complex and fine details, and it is particularly appreciated for its ability to produce sharp and detailed prints on various surfaces, such as those offered by dials.

2. Principle of pad printing

Pad printing relies on the use of a silicone pad, which is used to transfer the ink onto the surface of the dial. This indirect printing process is commonly used to apply patterns or inscriptions onto flat or slightly curved surfaces, such as watch dials. The method is particularly suited to small series and elements requiring great precision.

3. Printing process

1. Preparation of the pattern and the ink : The process begins with the creation of an ink film from an engraved plate of the pattern or inscription to be printed. The die (the engraved plate) is perfectly flat and chemically engraved with the pattern intended to be printed. The ink used for this type of printing is generally solvent-based, allowing optimal adhesion on metallic or lacquered surfaces, typical of watch dials. The ink colors can be chosen according to the aesthetic or functional needs of the watch design, and they can include an infinite palette of colors, but can also be metallic or luminescent in nature
2. Applying ink to the plate : The ink is deposited on a plate, a metal plate engraved with the image of the pattern to be printed. A squeegee is used to remove excess ink, leaving a uniform layer that exactly matches the pattern to be transferred.
3. Transfer with silicone pad: The stamp, made of soft silicone, is then pressed against the plate to pick up the ink. This soft stamp perfectly adapts to the shape of the dial, even if it has slight curves (doming) or an irregular surface (e.g.: Guilloché (engine-turning)). The ink-loaded stamp is then transferred onto the watch dial. Thanks to the flexibility of the stamp, the ink is printed with great precision, faithfully reproducing the pattern or numbers on the dial’s surface.
4. Drying and finishing: After the ink is applied, the dial is left to dry, often under controlled conditions to avoid imperfections. The dial is often placed in an oven (approx. 80 °C) to speed up drying while evaporating any air bubbles that may remain in the ink. In some cases, an additional protective layer, such as a clear varnish, may be applied to ensure the longevity of the print and protect the ink from scratches or wear over time.

4. Types of patterns and applications

Pad printing allows for a wide variety of expression on watch dials, whether for aesthetic, functional purposes or to increase legibility:

• Numbers and Index (hour marker): Printing numbers (Arabic, Roman or stylized) or Index (hour marker)s (lines, batons or dots) is common. These elements are crucial for ensuring the legibility of the dial and can be produced in various colors and sizes depending on the watch’s design.
• Graduations : Certain graduations (e.g., a Chronograph’s graduation indicating 1/10th of a second) require extreme precision and fineness. Pad printing is generally the most suitable method for displaying such graduations.
• Logos and brands: The manufacturer’s logo or other symbols associated with the brand can be printed using Pad printing. This method allows for the reproduction of complex patterns or fine details with remarkable precision.
• The Date / Calendar discs and other complications: Indications for date discs, Day or other horological complications can also be printed using this technique. The numbers or symbols on the apertures can be easily transferred using a pad to ensure perfect positioning.
• Decorative patterns: In addition to functional elements, pad printing is also used to apply more complex decorative patterns, such as fine lines, geometric shapes or particular textures. It allows artistic touches to be added to the dial while remaining true to the desired aesthetic.

5. Colors and luminescent materials

The colors used for Pad printing on watch dials can be very varied. In addition to standard colors such as black, white, the full color palette, Gold and Silver, special inks can be used for special effects. Among the most common colors are:

• Metallic colors: Different shades of Gold or a wide range of metallic colors can be used to give the dial a luxurious and refined look.
• Luminescent colors: Luminescent or phosphorescent inks, which absorb Light and release it in the dark, are often used for dial elements that need to remain visible in low Light conditions, such as Index (hour marker), numerals or hands. These inks contain substances such as Super-LumiNova or similar compounds, which allow the ink to emit a glow in the dark after exposure to Light.

Luminescent inks are often chosen for elements that need to remain visible in low-light environments, while offering a long emission duration, making them ideal for applications on watch dials, particularly on sports or diving watches.

6. Advantages of Pad printing

Pad printing offers several advantages for printing watch dials:

1. Precision and fineness: The method allows for printing very fine and detailed patterns, which is essential for complex dial elements, such as numerals or logos.
2. Adaptability: The silicone pad, thanks to its flexibility, allows ink to be transferred onto curved or irregular surfaces, which is particularly useful for printing on dials with slight curves.
3. Material flexibility: It can be used on a variety of Materials, including Metals, Ceramics, Sapphire, painted or lacquered Materials, stone, Wood, etc.
4. Durability: The ink used in Pad printing, once dried and cured, offers good resistance to aging and UV, ensuring the longevity of the print even after prolonged use.

Transfer (dial printing) or Pad printing is an essential printing technique in watchmaking, allowing the addition of patterns, inscriptions, logos, and decorative elements with remarkable precision on the watch Dial. Thanks to its flexibility and its ability to print fine and luminous details, this method is widely used to customize dials and enhance their legibility, while contributing to the overall aesthetics of watches.