Gradient Colour and Embossed Printing on ACP Panels in the UAE

The short answer

Two different effects can be printed onto an ACP (aluminium composite panel). A colour gradient is a smooth change from one colour to another. It is visual only, and the surface stays flat. Embossed UV printing, also called raised printing, builds cured ink up in layers so that selected details can be felt. It does not press or reshape the metal.

Sun Studio prints both directly onto the coated face of ACP at its studio in Al Quoz, Dubai, for projects across the UAE, with no minimum order quantity. This guide covers how to choose and specify the two finishes. For general ACP printing, start with our ACP panel printing service page.

ACP, ACM and the brand names

ACP is two thin aluminium skins bonded to a plastic or mineral-filled core. ACM, aluminium composite material, is a related term, used mostly in North America, where the metal is spelled aluminum. Alucobond and Dibond are brand names of 3A Composites, not general words for every panel.

Some makers also sell ACP with a texture pressed into the face at the factory. That is a panel finish you buy. It is not embossed printing.

What a gradient looks like on ACP

A gradient can run from one brand colour to another, fade a colour into the panel's own finish, or give a flat shape some depth.

Gradients are also the hardest thing to print cleanly. The usual fault is banding: visible steps where the blend should be smooth. It often starts in the file: a small colour change stretched over a long panel leaves very few tone steps to print, and image compression makes it worse.

We reduce that risk in file preparation and print settings, but we do not promise a band-free gradient or an exact colour match without a printed proof.

How raised printing adds texture

UV ink cures as soon as the lamp passes over it, so layers can be stacked in the same place until the ink builds into relief: a raised logo, lettering, a line pattern or a brush-stroke texture.

We can build the relief up to 6 mm high. Most panel work needs far less, because each layer is another pass of the press and height is priced as press time. It suits selected details, not a whole panel face. Beyond 6 mm, routed or cast letters are the right answer. Our guide to raised and embossed UV printing explains how the layers are built.

Can the two be combined?

Yes. The gradient is printed flat, and raised details are built up in chosen places, such as a logo over a colour fade.

Panel size does not rule it out. Our IQDEMY EVO 2500, a belt press 2.5 metres wide, prints both the colour and the raised layers on large ACP panels. Our Direct Color Systems flatbeds do the same on smaller panels and signs. We print on pieces up to 30 cm tall, so panel thickness is not a constraint. Send the dimensions and we will confirm the press.

How the panel finish changes the result

White panels keep colours closest to the file and give the most predictable gradients.

Coloured and dark panels pull printed colour towards the panel colour, because UV colours are translucent. A colour that has to match the file needs white ink underneath.

Brushed and metallic panels can be printed without white, so the metal effect shows through the ink. The colour reads darker, and it changes with the viewing angle and the lighting.

Leaving the white out is a deliberate choice when the finish is part of the design. If a gradient fades out into a dark or brushed panel, the white layer underneath has to fade with it, and that is prepared in the artwork.

Preparing the artwork

• Keep gradients live in the vector or layered file. Do not flatten them into a compressed JPEG.
• For long, soft blends in a raster image, work at 16 bits per channel. A little fine grain helps to hide steps.
• Give brand colours as Pantone references. They are a target; the proof on the real panel is what gets approved.
• Put raised areas on their own named layer, as solid shapes. Avoid hairlines, because a tall build rounds slightly at the edges.
• Put white ink on a separate layer too, if it is used only in places.

Samples, colour and alignment across panels

For an Accor office project in Dubai we printed one botanical artwork across a series of ACP panels. Each panel was its own file, set out so the artwork continued into the next one. For a set, send the elevation with each panel's size, position and joint gap.

A gradient that crosses a joint shows a colour shift more clearly than a busy pattern does. Print the set in one run, on panels from the same batch where possible, and keep the approved sample. A later reprint may not match exactly.

Approve that sample on the actual panel product, because the coating decides how well ink bonds. 3A Composites, which makes Dibond, advises printers to clean the panel with isopropyl alcohol and always to trial the ink. We test adhesion before a run.

A sample is not a weathering or fire test. Outdoor life depends on the coating, the ink and the exposure. If your project specifies a fire classification, ask the panel manufacturer how printing affects it.

Where these finishes suit

Feature panels, retail displays, reception graphics, exhibition panels and signage with raised lettering. We print the panels. We do not install cladding or supply panels in bulk.

Is ACP the same as an aluminium sheet?

No. ACP is a composite, and you print onto its factory coating. An aluminium sheet is solid metal. It may be bare, anodised or powder-coated, and each surface is prepared differently. For solid metal, see metal and aluminium printing and our guide to UV printing on bare, anodised and powder-coated metal.

Common questions

To ask for a quotation, send six things: panel dimensions, panel product and finish, quantity, artwork, the raised areas marked on their own layer, and your deadline. Contact details are on the ACP panel printing service page.