Label paper

Label papers are an indispensable component for numerous industries, especially where precise and robust labelling solutions are required. These special paper grades are usually coated on one side and must meet demanding requirements in terms of printability, processing and durability. They are used in highly automated production environments, particularly in the beverage industry, in the chemical industry and by packaging manufacturers.

Technological basics of label papers

Label papers are characterised by specific physical and chemical properties that make them particularly suitable for industrial applications. These include the ability to be printed in multiple colours using various printing methods such as offset, gravure or flexo printing, as well as excellent punchability and adhesive compatibility.

One-sided coating and finishing

The one-sided coating of the label papers ensures an even surface that optimises the application of colour and enables high-quality printing results. Depending on the coating technique and the paper recipe, the following variants are distinguished:

• Machine-coated papers: These offer a matt to semi-gloss surface and are suitable for a variety of standard applications.
• Chromo papers: These have an especially smooth and glossy surface that ensures brilliant printing results.
• Cast-coated papers: These papers have a high-gloss surface and are used for premium applications, such as decorative labels.

Resistance to industrial processes

Label papers must be able to withstand the physical and chemical stresses of industrial use. These include, among other things:

• Wet strength: Particularly important for labels that are exposed to moisture, such as those used in the beverage industry.
• Alkaline resistance: Crucial for applications in which labels have to be removed in rinsing processes, e.g. in breweries.
• Tear and break resistance: Necessary for trouble-free processing in high-speed labelling machines.

Quality requirements for label papers

The selection of a suitable label paper depends on several quality requirements, which may vary depending on the application. Here are some key properties in detail:

Wet strength and caustic permeability

• Wet strength ensures that labels retain their form and function even in humid environments or when refrigerated.
• Alkaline permeability is especially important for refillable bottles, as it allows for quick and residue-free removal of the labels in alkaline solutions.

Punching and curling

• Punching strength is a key requirement, as it ensures that labels can be precisely punched out of the paper sheet without tearing or deforming.
• Curl affects the ability of the labels to lie flat against the surface of the product after application.

Printability and convertibility

• Label papers must be suitable for various printing techniques, including UV varnishing, embossing and bronzing.
• Printability also includes the paper's ability to accept inks consistently and maintain high resolution.

Research and development

The development of label papers is driven by advancing technology and the increasing demands of industry. The latest research is focusing on:

• Sustainability: developing recyclable and biodegradable label papers.
• Improved durability: new coatings that increase both chemical and mechanical resistance.
• Integration of smart features: Incorporation of RFID chips or sensor-based technologies into label papers.