1. With regard to the warping of corrugated board, the social division of labor has become increasingly finer. Today, corrugated board has become a cartons factory where products are sold to downstream processing. Their demands for warpage of corrugated paperboard are getting stronger and stronger; in addition, due to social development, cartons After the mechanization of the road is becoming more and more high, in order to facilitate the mechanical feeding, to ensure the printing quality, but also require corrugated cardboard flat. Therefore, the flatness of corrugated board has become an important indicator to measure the quality of corrugated board. Nail Brush...WHICH BRUSHES FOR WHAT MATERIAL TO CHOOSE CORRECTLY? GEL - for gel modeling we choose brushes suitable for scooping UV / LED gel, so it is necessary to use a flat brush with which you can easily apply UV / LED gel on your nails and shape it into the right shape. There are several hair sizes and types. Furthermore, 2 shapes are used for gel modeling, either flat straight or flat oval. SAMINA Nails offers several types, which you can find HERE.
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Internationally, the degree of board warping is usually measured on the basis of US or Japanese standards.
The American standards are as follows: (The string height of a one-meter long corrugated cardboard warping
Very slight - less than 5mm;
Slightly -10mm;
Moderate --15mm;
Severe -20mm;
Very serious - 30mm.
Japanese standards are as follows (same as above):
They are required for cardboard partitions. Generally, a maximum allowable warpage of 20 mm above the board of 1.2 m width is allowed; for the 600 mm or less, the maximum allowable limit is 6 mm; for the width of 1000 mm, the allowable limit is 10-15 mm.
China's national standard stipulates that the warp of a one-meter-long corrugated cardboard should not exceed 20mm. In contrast, the Japanese standard should be the most reasonable.
The warpage of the corrugated board can be measured by a special warping gauge, or the cardboard can be placed on a platform to measure the chord height of the side arc of the cardboard warped surface.
In general, when the board has just exited the double-sided machine, the pressure and moisture are not yet in balance, and the board is generally flat. With the extension of the storage time, the board warpage will appear.
To determine whether the corrugated board is warped, place the newly produced single sheet of paper in the air for three minutes to see if it is warped. Then check the moisture and temperature of the finished products and the various semi-finished products of the production line according to the specific conditions, analyze the causes, and find out the correctness. Warping method.
Second, the main cause of warpage and corrugated board warpage caused by corrugated board warp is the most fundamental reason is due to the corrugated board surface, the paper size changes caused by the difference, this size change is due to the paper inside the cardboard Different moisture content, corrugated board to reach the moisture balance after the double-sided machine, high water content paper release moisture caused by this side of the paper shrink, low water content paper absorbs moisture caused by this side of the paper elongation causes the size difference caused by cardboard warping .
The factors that cause the above changes in water content can be analyzed from the following factors:
(1) The nature, type, and moisture content of the paper in the dough. In general, if the water content of the paper is higher than 3% in the paper, 92% of the board is warped;
If the facial tissue is 3% more moisture than the liner, 75% of the cardboard is warped.
If the moisture distribution in the full width of the base paper is not uniform, S-curvature tends to occur.
In addition, due to the different types of base paper, such as the degree of stretching of kraft liner board and tea board paper, due to the difference in fiber composition. Different manufacturing methods vary, and warping tends to occur when combining two grades of corrugated paperboards having a large correlation between A and C grades.
If the quantitative weight difference between the paper surface is also very different, it is easy to cause warping.
(2) Ambient temperature, tension The ambient temperature of the workshop also has an effect on the warpage of the cardboard. For example, in summer, moisture in the air is higher than in winter. In such an environment, the cardboard easily absorbs moisture in the air to achieve a moisture balance. Causes warpage due to differences in the size of the paper.
In addition, the tension of the paper base paper tray brake, the preheater tension, etc., also cause the paperboard to shrink laterally.
(3) Mechanical equipment and operation Due to the difference in operation, the warp is caused by the difference in water content of the paper in the cardboard surface.
(4) Characteristics of the glue and the amount of glue attached. The manufacturing process of the glue is different, and the difference in the amount of glue attached can cause the board to have a difference in water content and warp.
Third, the types of corrugated board warping Corrugated board warping types are the following:
(1) Longitudinal Warpage (A) Longitudinal Warpage (B) Longitudinal Warpage (2) Lateral Warpage (A) Lateral Warpage (B) Lateral Warpage (3) S-Warpage ( A) Two-way warpage 4. Correcting methods for different types of warping Although warpage of corrugated cardboard is unavoidable due to various reasons, we can control the board warpage phenomenon within the scope of standard requirements through the adjustment of the operating method. These adjustments are carried out under certain conditions, that is, the glue production process is stable and the base paper has been put into use. (To be continued)
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BRUSH CARE
If we want the brush to last us as long as possible, it is also necessary to take good care of it.
Never leave the brush in the water or detergent for too long - the brush head may come loose or the sleeve may start to rust
Clean the brush thoroughly - head and sleeve
Dry the moisture with a clean cloth or napkin
Place the brush upside down to dry
Dry at room temperature
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