Carbonless paper is a special kind of copy paper, which can realize the copying effect without using carbon paper. It is usually composed of two or more layers of paper, including one layer of base paper and one or more layers of coated paper. The base paper of carbonless paper can be ordinary printing paper, while coated paper usually contains some special dyes and chemicals to achieve the duplication effect.
Detection performance
The detection of carbon-free paper needs to pay attention to the following main properties:
Thickness and density: The thickness and density of carbonless paper will directly affect its stability and copying effect. Detection of thickness and density can be carried out by measuring indicators such as paper thickness, density and basis weight.
Copying effect: The main feature of carbonless paper is that it can achieve the copying effect, so the copying effect is an important content of carbonless paper detection. The detection of copying effect can be carried out by measuring indicators such as the degree of copying, copying clarity and copying color of the paper.
Strength: Carbonless paper needs to have a certain strength to ensure the stability and durability of the paper. The detection of strength can be carried out by measuring the tensile strength, tear strength and compressive strength of paper.
Abrasion resistance: Carbonless paper needs to have a certain degree of abrasion resistance to ensure the durability of the copying effect. The detection of abrasion resistance can be carried out by measuring the index of paper abrasion and surface hardness.
Flatness: Carbonless paper needs to have a certain level of flatness to ensure the clarity and details of the copying effect. The detection of flatness can be carried out by measuring the smoothness of the paper surface, the height of hairiness and the convexity of the board.
Gloss: The coated paper of carbonless paper usually contains some special dyes and chemicals to achieve the copying effect, so it needs to have an appropriate gloss to enhance the visual effect of the copying effect. The detection of gloss can be carried out by measuring the reflectance of the paper surface.
Environmental protection: Carbon-free paper needs to meet environmental protection standards, contain no harmful substances, and have no pollution to the environment. The detection of environmental protection can be done by measuring the volatile organic compounds, heavy metals, chloride ions and fluorescent whitening agents of paper, etc.
indicators to proceed.
Reusability: An important feature of carbonless paper is that it can be reused, so it needs to have a certain degree of reusability. The detection of reusability can be carried out by measuring the number of times the paper is rewritten and the change of the rewriting effect.
Antistatic: The coated paper of carbonless paper usually contains some special chemical substances to achieve the effect of copying, so it needs to have a certain antistatic property to avoid interference during the copying process. The detection of antistatic properties can be carried out by measuring the electrostatic charge and discharge time of paper and other indicators.
Scope of application: Coated paper of carbonless paper usually includes different types of dyes and chemicals, so different types of carbonless paper have different application scopes. The scope of application can be tested by measuring indicators such as the applicable environment of the paper, applicable copying tools and applicable copying materials.
The above performance indicators are the key contents of carbonless paper testing, and different use requirements and standards will also affect the testing standards and methods of paper.
