Couché paper: the most popular sharp printing substrate

If you are holding a cosmetics box, a cake box, or a pharmaceutical box in your hand, it’s likely made of couche paper. This material is popular not due to a lack of options, but because it effectively solves the problem most brands face: beautiful color printing, sharp images, and costs that are manageable.

What is couche paper?

Coated paper (coated paper) is paper that has a layer of mineral, usually kaolin, applied to the surface before printing. This coating smooths the surface, keeping the ink on top of the paper instead of soaking into the fibers, resulting in more accurate colors, finer details, and sharper images compared to standard offset paper.

There are two main variants you need to know:

• C1S (coated one side): the outside is smooth for printing, the inside is for uncoated or adhesive. At the same weight, C1S is stiffer than C2S because the uncoated side maintains fiber structure. This is the standard type for folding packaging boxes and covers.
• C2S (coated two sides): both sides are coated, allowing for beautiful printing on both sides. Suitable for outer packaging (sleeve), brochures accompanying boxes, or any application requiring double-sided printing.

Each type has two surface feels: glossy and matte. Glossy couche provides vibrant colors and catches light. Matte couche offers a more subdued, elegant look with less glare. Matte lamination is often suitable for packaging that requires a polished appearance, but this is a suggestion regarding texture, not a hard rule.

In terms of weight: a range of 300 to 350 gsm is the most common for folding boxes based on practical experience. A lower weight, around 210 to 250 gsm, is suitable for labels, thin outer packaging, and accompanying publications. Note that the actual thickness can vary by paper supplier, so specific parameters should be checked during production; do not rely on general conversion numbers as technical references.

When to choose, and when not

Glossy paper is a reasonable choice when product images and brand colors are the top priority, with a budget ranging from affordable to mid-range, and the box serves as outer packaging rather than needing to protect moisture or retain fragrance inside.

You should not choose couche when the brand is positioned towards handcrafted, rustic, or natural, as the smooth, glossy surface of couche will disrupt that feeling. It is also not advisable to use couche as primary packaging for moist food, oil, or items that need to retain aroma, as the mineral coating is not a true barrier. If the brand aims for a premium tactile experience with embossing, foil stamping, and special textures, art paper is the right choice.

Costs, time and quantity

The cost of couche materials is moderate within the list of packaging materials. Compared to art paper or metal, it is significantly cheaper. Compared to kraft or duplex, it is slightly higher, but the print quality is distinctly better.

Minimum quantities and production times depend on the printer, box size, and additional processing techniques such as foil stamping or lamination. Generally, couche is the most common material on the market, and lead times are usually shorter than for art paper or metal.

Even with a standard color printing base, you still need to print samples and compare Pantone colors before running production. Actual printing costs are reported by the printer based on specific technical specifications and quantities. Sinh Vũ does not guarantee printing prices and does not represent the printer.

What does Sinh Vũ need from you to get started

To choose the right type of couche, the correct quantity, and the appropriate processing technique for the box, the consultant needs the following information from you:

• Product SKU and box dimensions: how many SKUs, preliminary dimensions or volume required.
• Brand positioning: mainstream, mid-range, or premium, to determine if there is a need to upgrade to art paper.
• Market and compliance: whether selling domestically or exporting, are there labeling requirements according to Decree 43/2017 (amended by Decree 111/2021) or industry regulations for food and pharmaceuticals?
• Reference budget: to select the appropriate quantity and processing, without exceeding necessary costs.
• Timeline: When do you need sample products, and when do you need the actual production?
• Special requirements: needs to be printed on both sides or plans for foil stamping, matte lamination, or additional processing.

When you have all the above information, determining whether to use C1S or C2S, which weight to choose, whether to go for a matte or glossy surface, and preparing the files according to the printer's requirements becomes much clearer.

This article is for reference. The scope, pricing, and specific commitments of Sinh Vũ are detailed in the proposal and signed contract.