What Are The Characteristics Of Oblique Screen Special Paper Machine

With the increase of attention of paper-based functional materials, more and more people know the special paper machine of inclined net. In the minds of many people, as long as the project of paper-based functional materials is on, the special paper machine for oblique mesh must be on. In fact, this is a misunderstanding. First of all, let's take a look at what is a slant screen special paper machine and what are its characteristics.

[What are the characteristics of oblique screen special paper machine]
The appearance of slant special paper machines is due to the application of long fibers and non-vegetable fibers in papermaking. Because of the characteristics of oblique wire forming, it has good dewatering performance, good papermaking uniformity and air permeability, low net concentration, and the fiber length that can be made. It has obvious advantages in some special paper production compared with other paper machines such as fourdrinier The advantages.


Applicability of slant wire former
1) Suitable for the formation of long fibers and their mixed fibers in a low concentration state
During storage and transportation, long-fiber pulp often lacks sufficient stiffness due to its slender fibers (large aspect ratio). When the fibers collide and contact with each other, the slender, soft fibers tend to flocculate. This requires long fibers to have sufficient space to remain suspended when surfing the Internet to prevent flocculation.

The slant wire former is designed to meet the special requirements of long fibers and their mixed fibers when they are on the Internet. It can generally adapt to the formation of long fibers with a length of 3 to 25mm and a net concentration between 0.05% and 0.025%.

In general, fourdrinier and cylinder formers are limited to a net concentration of 0.05% to 0.2%, and it is not difficult to copy long fiber products.

2) Ensures good uniformity and bulk of the finished product
Only in the highly diluted state of the fiber suspension can the slender fibers be fully stretched freely. This requires a large amount of dewatering of the inclined wire former in a timely manner.

The inclined net can generate a forming barrier with a depth of 200 ~ 500mm in the weir pool, and the whole dewatering and forming are basically carried out simultaneously. The fiber is formed on the net with sufficient stretch for many times. Unlike the fourdrinier and rotary screen, which can be formed in a short time and a short distance, the fourdrinier and fourdrinier paper machines can not function.

Because the oblique mesh former has unique characteristics, the formed paper has good uniformity after being formed, and can meet the specific requirements for air permeability, so it is especially suitable for the production of automotive filter materials, coffee filter materials, etc.

3) Particularly suitable for forming special paper with small aspect ratio
Fourdrinier and rotary screen paper machines copy the pages, which have a large aspect ratio, generally between 2.5 and 5: 1, and are only suitable for making general purpose paper; while long-fiber special papers, such as tea filter paper and casing paper For long-fiber paper such as automobile filter paper, the smaller the vertical and horizontal tension ratio of the finished product, the better.

Due to the rapid development of filtering materials in China in recent years, there are many oblique screen special paper machines (multilayer / bleached sheet). So it caused a misunderstanding to many people. When they talk about special fiber, they think of slant net special paper machine. The determination of a molding method depends on the characteristics of the fiber, especially the dispersion characteristics and dewatering characteristics; in addition, the requirements of the product must be combined. For example, special requirements for electrical paper and insulation paper, adjustable angle fourdrinier paper machine is the best choice, it combines the characteristics of fourdrinier and oblique screen.