What are the paper test items?

What are the paper test items? Paper is the most commonly used material for packaging and printing. Its physical properties will have a direct or indirect impact on the quality of printing. Correctly understanding and mastering the nature of paper, according to the characteristics of the product, the rational use of paper to improve the product's printing quality, will play a positive role in promoting.

1 . Quantitative:

It refers to the weight per unit area of ​​the paper, which is expressed in g/ m2 , which is the weight of one square meter format paper. The level of paper quantification determines the physical properties of the paper.

2 . thickness:

Thickness of paper is the degree of, units of measurement is usually expressed μ m or mm, and the thickness of the quantitative tightness closely related.

3 . Tightness:

Refers to the weight per cubic centimeter of paper, expressed as g / C m2 .

4 . hardness:

It is the performance of the paper that resists the indentation of another object, and it is also the rough appearance of the paper fiber structure.

5 . Smoothness:

Refers to the degree of surface roughness of the paper, expressed in seconds and measurable.

6 . Degree of dust:

Refers to the impurity spots on the paper surface, there is a clear difference between the color and the paper color.

7 . Sizing degree:

The paper surface of writing paper, coated paper, and wrapper are generally sized to form a water-resistant protective layer.

8 . Ink absorption:

It indicates the ability of the paper to absorb ink. Paper with good smoothness and sizing degree has weak ink absorption, and the ink layer dries slowly, and it is easy to stick dirty prints. On the contrary, ink absorption is strong and the printed products are easy to dry.

9 . Vertical and horizontal:

Refers to the direction in which the paper fibers are arranged.

10 . Telescopic rate:

It refers to the dimensional variation of paper after moisture absorption or water loss.

11 . Air permeability:

In general, the thinner the paper and the lower the tightness, the greater the breathability, and the paper with high air permeability is likely to attract double paper during the printing process.

12 . BaiDu:

It refers to the brightness of the paper. If the paper reflects all the light, it can be seen by the naked eye as white.

13 . Positive and negative:

The positive and negative gloss of the paper is different, which directly affects the ink absorption performance and the printing quality of the product.

What are the paper test items? In summary, the correct understanding and identification of the main physical properties of paper and its impact on printing, according to the nature and characteristics of the paper, can effectively reduce or avoid the occurrence of printing failure, and thus ensure the production efficiency and product printing quality. Up to the instrument specializing in the production of carton compression machine, burst strength testing machine, slope impact testing machine, vibration table, drop test machine, whiteness meter and other packaging equipment, welcome to inquire.