Paper basic performance corpus, see how much you know

1.Quantitative

Quantitative, commonly known as gram weight, refers to the weight of paper per unit area, generally expressed in grams per square meter.

Quantitative is the most basic physical index of paper, its level and its uniformity affect all physical, mechanical, optical and printing properties of paper. Quantity is the most basic quality index of paper and cardboard. Because most paper is sold by weight. Quantitative refers to the weight per unit area, generally expressed in grams per square meter of paper. And we generally use the area of paper sheet.

2. Thickness

Thickness indicates how thick or thin the paper is.

The micrometer is used to measure the thickness of the paper under a certain area and a certain pressure. The general pressure is 980 kPa. Generally, the thickness of a batch of paper or cardboard is required to be consistent, otherwise the thickness of the finished product will be inconsistent. Tightness refers to the weight of paper and cardboard per cubic centimeter. The results are expressed in grams/cm3. Tightness = basis weight/thickness.

 

3.Tightness

Tightness refers to the weight of paper and cardboard per cubic centimeter. The results are expressed in grams/cm3.

Tightness is an index to measure the tightness of the paper or cardboard structure, and is the basic property of paper and cardboard. It is closely related to the porosity, absorbency, rigidity and strength of paper. And it affects the optical properties, printing properties and physical properties of paper and cardboard.

4.Smoothness

Smoothness refers to the time required for a certain volume of air to pass through the gap between the surface of the sample under a certain pressure and the glass surface under a certain degree of vacuum, expressed in seconds.

The smoothness depends on the surface condition of the paper. If the paper surface is uneven, the smoothness of the paper is poor.

5.Longitudinal and horizontal dimensions of paper and cardboard

The paper has a certain direction, and the longitudinal direction refers to the direction parallel to the running of the paper machine. Most of the fibers are arranged along the running direction of the paper machine, and in this direction, the paper bears a greater pulling force. Horizontal direction refers to the direction that the paper is perpendicular to the running direction of the paper machine.

When measuring various physical properties and optical properties, the orientation of the paper must be considered. Tensile strength and folding endurance are larger in the longitudinal direction than in the transverse direction. The tearing degree is large in the transverse direction. When measuring the optical properties of paper, for example, the whiteness is lower in the longitudinal direction than in the transverse direction. The paper requires a large longitudinal tensile strength (cable paper and paper rope paper).


Post time: Jul-19-2022