Decorative base paper has only a production history of over forty years and is still a new industry. As people’s demands for decoration styles become increasingly diverse, it is necessary to continuously improve the performance of decorative paper to meet the requirements of later processing. Decorative base paper has strict requirements for optical properties such as whiteness, and titanium dioxide is relatively expensive. Therefore, it is very important to find a filler with similar properties to titanium dioxide to replace it.

Explored the papermaking process of decorative base paper, and the results showed that the ratio of coniferous wood pulp to broad-leaved wood pulp was 6:4; The degree of beating is 33 ° SR; The amount of PAE added is 2%; The amount of titanium dioxide added is 30%; The amount of CPAM added is 0.06%. Under these conditions, it can meet the requirements of decorative base paper for strength, breathability, absorbency, and optical properties. When preparing titanium dioxide/kaolin composite fillers, four influencing factors were selected: dispersant dosage, ratio of titanium dioxide to kaolin, reaction time, and grinding concentration. Through orthogonal experimental analysis, the process conditions for preparing the composite were as follows: dispersant dosage of 0.3%, kaolin/titanium dioxide ratio of 5:5, composite time of 0.5 hours, and grinding concentration of 45%. Under these conditions, the whiteness of the prepared titanium dioxide/kaolin composite filler is 92.5% ISO, and the covering power is 30.33g/m2. Characterization of the composite effect of titanium dioxide/kaolin composite fillers using scanning electron microscopy (SEM), infrared spectroscopy (FTIR), and X-ray diffraction (XRD). Scanning electron microscopy (SEM) can visually observe the composite of titanium dioxide and kaolin. Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) analysis show that the coating of kaolin with titanium dioxide is not simply a physical adsorption, but a chemical reaction occurs. Chemical bonds Si-O-Ti and Al-O-Ti are formed between titanium dioxide and kaolin, and the crystal structure changes, resulting in a good coating effect. In addition, the effects of pressing+vacuum drying, vacuum drying, pressing+plate drying, and plate drying on the properties of decorative base paper were compared when adding composite fillers and mixed fillers. The first three drying methods are more beneficial for maintaining the strength of the base paper, but the breathability and absorption of the base paper obtained by pressing and vacuum drying are slightly poor. The difference in the effectiveness of vacuum drying and pressing+plate drying is not significant; When using flat drying, the strength of the base paper is poor, with good breathability and absorption, which cannot meet the production needs; The four drying methods have little effect on the optical properties of the base paper and cannot be used as a standard to distinguish the quality of the optical properties of the base paper. Therefore, the effects of vacuum drying and pressing+plate drying are both suitable. After adding four different fillers, namely kaolin, titanium dioxide, titanium dioxide/kaolin composite filler, and kaolin and titanium dioxide mixed filler, to paper, the difference in whiteness and opacity of the paper is very small. In terms of strength performance, breathability, and capillary absorption height, the composite filler has a better effect, and its performance is close to that of titanium dioxide.

Processing technology of decorative base paper production line

1、 Selection of raw materials
The raw materials for decorative paper can be wood pulp paper, waste paper, and other paper materials. Among them, wood pulp paper has excellent quality and uniform fibers, making it the preferred choice for producing high-end decorative paper.
2、 Coating
Apply raw materials such as wood pulp paper through a coating machine to form a uniform coating on their surface, which serves to reinforce, enhance, and beautify them.
3、 Printing
Printing is one of the important processes of decorative paper. Printing machines print patterns onto coated materials, giving them features such as beauty and color. The development of printing technology has created more possibilities for decorative paper. Currently, there are various types of decorative paper on the market with exquisite patterns, providing users with more choices.
4、 Processing
After the decorative paper is made, a series of processing steps are required. For example, processes such as hot pressing and painting are used to enhance surface hardness, prevent moisture and dirt, and protect decorative surfaces.
In general, the production process of decorative paper includes the selection of raw materials, coating, printing, and processing, each of which is very important. Through scientific processing procedures and strict quality monitoring, high-quality and aesthetically pleasing decorative paper products can be produced, providing high-quality decorative material choices for fields such as home decoration and commercial decoration.

Analysis of reasons for low expansion of decorative base paper

First, paper structure

One of the reasons for the low expansion of decorative base paper is the structure of the paper. The expansion of decorative base paper is affected by fiber length, fiber composition, paper thickness, pressure and other factors. If there are more slender fibers, the expansibility of the paper will decrease accordingly; The thickness of the paper is too thin, and it also has a certain impact on the expansion.
Second, the production process

The production process is also one of the important reasons for the low expansion of decorative base paper. Too much pressure in the production will make the fiber of the paper sticky, correspondingly affect its expansion, and cause the fracture of the fiber, and even lead to the appearance of deterioration traces such as white spots and black spots. In the production, it is also necessary to pay attention to the condition of the surface of the paper structure, and the lack of surface smoothness will lead to surface defects and color distortion.
Three, temperature and humidity

Temperature and humidity are also one of the important reasons for the low expansion of decorative base paper. Production and storage process should pay attention to the temperature and humidity of the environment, too high temperature and humidity is not conducive to the expansion of the paper and color maintenance, too low will affect the flexibility and ductility of the paper.

4. Quality control

In the production process of decorative paper, quality control is also a crucial part. Through sampling and control in the process of raw materials, processing and storage, important parameters such as paper specifications, surface smoothness, color and expansion can be checked to ensure that the quality of decorative base paper meets the needs.

The solution:

1, for the fiber length, fiber composition, paper thickness and other factors, by adding appropriate additives, adjust the structure of the paper, so that its expansion.

2, control the pressure, viscosity ratio and other factors in the production process, so that the paper structure is more suitable and stable.

3, reasonable control of production and storage temperature and humidity, pay attention to environmental protection, humidity control.

4, do a good job in quality control sampling, control, improve the quality of paper.

In short, decorative base paper expansion is low because of many factors. To avoid this problem, in addition to adjusting and improving for specific reasons, quality control and technological innovation should be emphasized.