With the deepening of reform and opening up, the gradual realization of the four modernizations, computer paper, industrial paper are inseparable from the coating of this papermaking process, in the coating process, as long as the first link goes wrong, the coating quality will be significantly reduced, if the quality of the base paper can not pass the close, it will directly affect the paper coating.

1.The effect of base paper on coating

（1）The strength of the coating on both sides of the base paper is different, and the strength of the coating on both sides of the coated paper is not the same as that of the base paper. Generally, the coating on the upper layer is weaker than the screen surface, which is mainly due to the different content of the adhesive, filler and fiber strength of the paper.

（2）The water content of the base paper is too high, which is easy to increase the transparency of the paper after pressing, the paper is black, and the paper is moldy, while the water content of the paper is too low, and the plasticity is poor and the smoothness is not high.

（3）The smoothness of base paper and the absorption of base paper will affect the amount of coating and the amount of coating migration, which will affect the glossiness of the finished paper and the microstructure and surface strength of the coating layer. In addition, the extension of the production cycle makes the paper machine mesh, press, blankets and other paper machine conditions deteriorate, which affects the uniformity of both sides of the base paper and affects the coating.

（4） The quantitative error of the whole width is too large, in the calenderness, the smoothness is uneven, the level and brightness of the printed picture is uneven, the unilateral thickness is uneven to produce the horn roll, after the calenderness is cut into flat paper, the paper holder is inclined, and it cannot be printed normally. The difference in the quantity and thickness of the banner also affects the liquid phase migration of the coating and the uniformity of the coating.

(5) Paper has oil, pulp, dust, wrinkles and other paper diseases, calender, easy to break the paper, damage the calender roll, dust will affect the printing drawing.

2.Effect of adhesive on coating

The amount of adhesive is the main factor affecting the strength of the coating. The higher the amount, the greater the consolidation force between the coating particles, and the stronger the binding force between the paper coatings.

3.The effect of ink absorbency on coating

The lower the ratio of adhesive and pigment in the paint, the greater the ink absorption, when the adhesive too much into the base paper, also increase the ink absorption, the type of pigment, the particle size is different, the ink absorption is also different, the particle size is large, the ink absorption is high.

4.The influence of smoothness of base paper on coating

Smoothness depends on the difficulty of coating in calendering, with the increase of adhesive to pigment ratio, can get a best smoothness, if flat

When the smoothness reaches the highest point, the smoothness decreases. If too much adhesive is used, the smoothness decreases. Due to the reduction of the plasticity of the coating, the ease of calendering is quite different with the different adhesives and the different types of pigments.

5.The influence of the amount of coating on coating

The coating amount is too low will reduce the coating covering power of coated paper, thick paper is easy to expose the bottom, smoothness, whiteness, opacity decline, affecting printing performance, the powder amount is high and low, making the thickness of the illustrated book inconsistent, difficult to fit.

JIERUIXIN coating machine coating head with accurate coating amount control, so that the coating more uniform and fine, thereby improving the coating quality.

And They have their own chemist and prefer to supply chemical ,formulation ,technology and other suggestion to customers.Then their formulation will match our machines ,and get the best quality paper for customer.

6.Improve uncoated printing paper

Many digital printing papers, whether for office or home use, generally use full chemical pulp as a raw material for alkaline papermaking. The brightness of the paper made is consistent, the paper is blue and white, smooth, hard, and the surface of the paper is free of dust. To meet the above requirements, it is necessary to improve the running of the paper, and to integrate the control process technical conditions and fill raw materials.

There are many reasons affecting the paper coating, and every paper worker needs to further explore and explore in practice, so that the coating quality of the paper industry will have a qualitative leap.

QINGDAO JIERUIXIN INDUSTRIES CO LTD,are specialized in paper coating industries for decades with our own chemist team design exclusive formula for customers from all over the world.With rich experience in establishment of paper coating machine line and chemical supply,we are the go-to source of the paper coating industries that can comprehensively support you from paper,machines and chemicals.Welcome inquiry and experience our excellent service with best quality.