Carbon free paper is a special carbon paper, it can achieve the carbon effect without carbon paper. It is usually composed of two or more layers of paper, including a layer of bottom paper and a layer or more layers of coated paper. The underlying paper of carbonless paper can be regular printing paper, while coated paper usually contains some special dyes and chemicals to achieve the carbon copy effect.

Erkennungsleistung
The detection of carbonless paper needs to pay attention to the following main properties:

Dicke und Dichte: The thickness and density of non-carbon paper will directly affect its stability and copy effect. Die Dicke und Dichte können durch Messen der Papierdicke gemessen werden, Dichte und Grundgewicht.

Carbon copy effect: The main feature of non-carbon paper is that it can achieve the carbon copy effect, so the carbon copy effect is an important content of non-carbon paper detection. The detection of the carbon effect can be carried out by measuring the paper’s carbon degree, carbon clarity and carbon color and other indicators.

Strength: Carbonless paper needs to have a certain strength to ensure the stability and durability of the paper. Die Prüfung der Festigkeit kann durch Messung der Zugfestigkeit erfolgen, tearing strength and compression strength of the paper.

Wear resistance: Carbonless paper needs to have certain wear resistance to ensure the durability of the carbon copy effect. The wear resistance can be tested by measuring the wear degree and surface hardness of the paper.

Flatness: carbonless paper needs to have a certain flatness to ensure the clarity and detail of the carbon copy effect. Flatness can be measured by measuring paper surface smoothness, feather height and board convexity and other indicators.

Carbonless paper performance test and methods

Gloss: Carbonless paper coated paper usually contains some special dyes and chemicals to achieve the carbon copy effect, so it needs to have the appropriate gloss to enhance the visual effect of the carbon copy effect. The detection of gloss can be done by measuring the reflectivity of the paper surface.

Umweltschutz: No carbon paper needs to meet environmental standards, no harmful substances, keine Verschmutzung der Umwelt. Der Umweltschutz kann durch die Messung flüchtiger organischer Verbindungen überprüft werden, Schwermetalle, Chloridionen, Leuchtstoffaufheller und andere Indikatoren.

Reusability: An important feature of carbonless paper is that it can be reused, so it needs to have some reusability. Reusability can be tested by measuring the number of copies of the paper and the change in the copy effect.

Antistatic: The coated paper of non-carbon paper usually contains some special chemicals to achieve the carbon copy effect, so it needs to have some antistatic property to avoid interference in the carbon copy process. The antistatic property can be detected by measuring the amount of electrostatic charge and discharge time of the paper.

Geltungsbereich: The coated paper of non-carbonized paper usually includes different types of dyes and chemicals, so different types of non-carbonized paper have different scope of application. The detection of the scope of application can be carried out by measuring the applicable environment of the paper, applicable copying tools and applicable copying materials and other indicators.

The above performance indicators are the key content of non-carbon paper testing. Different usage requirements and standards will also affect the testing standards and methods of paper.