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Identify the quality of writable kraft tape!

Article provenance:未知 Popularity:Time:2020-05-16 09:33

To Identify the quality of some characteristics of writable kraft tape, then what is the sense of its special term?
Generally, the physical characteristics of writable kraft tape are quantitative, stiffness, smoothness, whiteness, thickness, thickness banner difference, tightness, opacity, surface absorption, crack length, transverse folding resistance, smoothness, transverse expansion rate, printing surface strength, ash, dust, moisture, sizing degree, etc., so we will explain them for you one by one.
Ration: weight of writable kraft paper tape per square meter, unit: g / mm. The ration must be even, otherwise the paper stack will be inclined and bent, which will not print normally, and the uneven ration will directly affect the smoothness of the paper.
Stiffness: the fiber of writable kraft tape determines the density and intermittence of the paper. Bagasse pulp has good toughness and medium length of fiber, bamboo pulp has good stiffness and long fiber, wheat straw pulp intermittent large fiber is medium long, acacia wood fiber is small and short. The intermittence of coniferous pulp is large and the fiber is long. The formation of paper is just like building a house. The coniferous pulp is steel, and other pulp is cement and sand. The combination of cement and sand depends on the size of each other's intermittence, otherwise it can only be solved by sizing and beating. Therefore, the stiffness can be well matched with the operation of high-speed machine in printing, provided that the uniformity of paper is uniform.
Smoothness: the smoothness is the result of surface treatment. The writable kraft tape with sizing is generally over 35S after a soft press, and the surface smoothness can also help reduce the powder loss. The smoothness level is very helpful to the printing dot reduction. The finished product is bright and lifelike. Paper printing with a surface smoothness lower than 20s is easy to be stained, diffused and penetrated.
Thickness: thickness is the actual thickness of writable kraft tape, generally in millimeters. The thickness of the paper sample measured under a certain pressure between the measuring plates. Many printing factories buy writable kraft tape sheets with a higher thickness. For example, if the thickness of 70g paper is 85m / s, as long as it reaches this thickness when printing, it is 70g. This understanding is wrong. Most of the time, the manufacturer will adjust the loose thickness according to the type of printing products, and the thickness of 65g can reach 70g. This is the decision of the user and the supplier. As long as the quantitative stability of the paper banner, the thickness has no effect on the printing performance.
Thickness banner difference: the thickness difference of writable kraft tape in the horizontal direction. If the value is too large, it means that the thickness of the paper is uneven, and it may be discounted in the printing direction, or even the paper cannot pass through the printing machine.
Tightness: related to the weight of writable kraft tape. Increasing the paper's tightness can enhance the paper's tensile strength and bursting resistance, but if the tightness is too large, the paper's opacity will be reduced, the paper's loose thickness will be poor, the paper's hand feel will be poor, and the paper's compressibility will be poor. Because the thickness of the paper is not necessarily uniform, and the contact pressure between the printing plate and the paper is light and heavy during printing, which will inevitably affect the printing quality. The printing imprints printed on the soft, elastic and compressible paper must be clear and distinct.
Opacity: opacity refers to the ratio of the reflection ability of a single sample on the "full absorption" ink pad to the reflection ability of several samples with full opacity, indicating the opacity of the paper. Generally speaking, it is the degree of paper through printing. writable kraft tape is generally opaque, that is, pure opacity. For printing paper, if it needs to be impervious to printing, the ink on one side will not penetrate into the other side to ensure the quality of printing, otherwise it will affect the clarity of the handwriting or pictorial on the other side. For writing paper also requires a certain degree of opacity, in order to facilitate both sides of the paper. For printing paper and writing paper, the higher the opacity is, the better.
Surface absorption: it refers to the absorption capacity of water or other liquid. The surface absorption should have a certain amount to facilitate the transfer and absorption of ink. If it is too large, the water absorption is too large, and the kraft paper is easy to deform during printing.
Breaking length: the length of paper or paperboard when it breaks due to its own weight, which indicates the paper's breaking resistance. This index is very important for paper used for rotary printing, because the higher breaking length helps to bear the traction of the press.
Transverse folding resistance: refers to the number of times that the writable kraft tape can withstand 180 degrees of reciprocating folding under a certain tension. As the book is to go through many times, so the paper must have a certain degree of folding resistance to avoid premature damage of the book.
Smoothness: the smoothness of writable kraft tape refers to the smoothness and flatness of the paper surface. It is more important for printing paper. The essence of printing is a transfer of ink to paper. The better the contact degree between ink film and paper is, that is, the more flat the paper is, the more smooth the surface of printed products can be printed and the ink can be absorbed evenly. Therefore, the lines of printed brushes and pictures printed on the surface of smooth printing paper are clear and eye-catching. The smoothness of paper often affects the quality of printing. The paper with rough surface is difficult to get the ideal impression, so the fine printing products must use high-quality coating paper to ensure the printing effect.
Horizontal expansion rate: refers to the relative change of humidification or dehumidification size in immersion and water or under different humidity, expressed by the increase or decrease of size. It can indicate the dimensional stability of writable kraft tape and whether the paper is stable or not, which is very important to the overprinting offset printing. When printing, it is required that the paper should not be stretched as much as possible or not. The paper with poor dimensional stability is easy to deform when printing, and the overprinting is not good when color offset printing.

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