Identification of the correct use of dust-free paper
Dust-free paper (AirlaidPaper) is divided into M-3,0604,0606,0609,0709 and other series, also called dry papermaking nonwovens (Airlaidpulpnonwovens), which is a kind of dry nonwoven. Dust-free paper has unique physical properties, such as high elasticity, softness, excellent hand feeling and drape feeling, high water absorption and good water retention performance. It is widely used in health care products, special medical products, industrial wiping products and other fields.
dust-free paper is a kind of thin paper, positive and negative bad analysis. Let's look at the methods that professionals have summarized for us.
1. Tearing Method Take the test piece with one hand so that the longitudinal direction is parallel to the line of sight and level with the surface of the test piece. Pull the paper upward with the other hand so as to tear it in the longitudinal direction first. Then gradually turn the direction of the tearing paper to the horizontal, tear it off to the outside of the paper and turn it over. In this way, on the other side, the paper is still torn according to the upper method, and the paper wool on the two tear lines is more obvious on one line than on the other. In particular, the longitudinal to the transverse curve, the paper hair is obvious for the mesh surface. When the net is facing up. The edge of the paper is even worse.
2. Intuitive method: fold a test piece and observe the relative smoothness of one side. The net surface can often be recognized from the diamond indentation of the paper net. When holding, place it horizontally, make the light form a 45 ° angle with the paper surface, and the line of sight also form a 45 ° angle with the paper surface, and observe the net marks on the paper surface. The paper surface can also be observed under a microscope to help identify the mesh surface.
3. Wetting method: impregnate the paper surface with water or dilute sodium hydroxide solution, drain the excess liquid, place it for a few minutes, and observe both sides. If there is a clear screen print, it is the reverse side.
dust-free paper is a kind of thin paper, positive and negative bad analysis. Let's look at the methods that professionals have summarized for us.
1. Tearing Method Take the test piece with one hand so that the longitudinal direction is parallel to the line of sight and level with the surface of the test piece. Pull the paper upward with the other hand so as to tear it in the longitudinal direction first. Then gradually turn the direction of the tearing paper to the horizontal, tear it off to the outside of the paper and turn it over. In this way, on the other side, the paper is still torn according to the upper method, and the paper wool on the two tear lines is more obvious on one line than on the other. In particular, the longitudinal to the transverse curve, the paper hair is obvious for the mesh surface. When the net is facing up. The edge of the paper is even worse.
2. Intuitive method: fold a test piece and observe the relative smoothness of one side. The net surface can often be recognized from the diamond indentation of the paper net. When holding, place it horizontally, make the light form a 45 ° angle with the paper surface, and the line of sight also form a 45 ° angle with the paper surface, and observe the net marks on the paper surface. The paper surface can also be observed under a microscope to help identify the mesh surface.
3. Wetting method: impregnate the paper surface with water or dilute sodium hydroxide solution, drain the excess liquid, place it for a few minutes, and observe both sides. If there is a clear screen print, it is the reverse side.
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