9. Whiteness of white paper
The whiteness of each batch of coated white paper must be the same. When the whiteness is different, the color of the printed pattern will be inconsistent and there will be differences in hue.
10. Tightness
Tightness can affect a number of physical properties of the paper, such as low tightness of the paper, the air permeability is high; high tightness, the paper has high tensile strength, high tearing, and high transparency.
11. Vertical and horizontal paper
This refers to the direction in which the paper fibers are arranged. In the papermaking process, the paper machine runs in the longitudinal direction of the paper and can be identified from the acute angles that the web marks present. The transverse shrinkage of paper is greater than that of the longitudinal direction, and the shrinkage of the original paper of different materials in the automatic production line of corrugated cardboard is quite different. The ring paper strength of the base paper is greater than the horizontal direction.
Appearance Quality
Some of the appearance quality defects of the base paper and the corrugated paperboard and corrugated carton processing performance ("9C mouth brush performance"), processing quality (physical quality and appearance quality) have a greater impact, and will cause a lot of waste defective, Need strict control.
(1) There are holes or damage on the paper surface, and the edges of the web are damaged or cracks, burrs or burrs occur. The web is collapsed and the core collapses. The broken ends in the web are not connected properly. , can easily lead to single-sided machine or dynamic production line breaks and downtime.
(2) The base paper has pulp, grass knots, hard debris, pleats (dead pleats and live folds), uneven thickness, and fish scales, which can easily lead to high and low corrugations on the corrugated board produced by single-sided or automatic lines. Lucy phenomenon.
(3) The base paper has pleats (dead pleats and live folds), wrinkles, holes, uneven thickness, fish scales, pulp, grass knots, and hard debris. The noodle layer of the liner paper is layered. Non-uniform foaming, noodle finish and exposed base, wool or streaks, spots, dust, powder dropping, lint, and the surface color of the base paper are inconsistent, which will affect the printing quality and lead to poor appearance of corrugated cardboard and corrugated boxes.
(4) If the defects of holes, uneven thickness, scales, etc., are positive on the box body of the corrugated box, the compressive strength of the carton will be reduced.
Surface performance
The surface properties of the base paper have a certain influence on the quality of the carton printing and the handling, handling and transportation of the product, and mainly reflect the following aspects.
1. Smoothness
The smoothness of the paper has a great influence on print quality, such as image sharpness and color effects. For fine colored corrugated box prints, the raw paper used requires a high degree of smoothness.
2. Surface strength
This indicator mainly assesses the degree of pulling and powder falling on the surface of the paper during the printing process. It is easy to produce wild ink by pulling wool and dropping powder, and the paper gray and paper powder also easily jam the printing plate, resulting in a paste plate.
3, friction resistance
Raw papers with poor rubbing resistance can cause surface scratches during the printing and finishing process.
4, the front and back of the paper
There are certain differences in the smoothness, absorbability, and printability of the front and back sides of paper, and must be carefully identified in production and used as required.
(Author/Huang Yuerong Hunan Yueyang Sanwu Packing Material Factory)
"Printing Technology" corrugated box special issue 2005, 7
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