CN108589384B

CN108589384B - A novel low-speed water conservancy formula head box for long fiber papermaking

Info

Publication number: CN108589384B
Application number: CN201810309006.5A
Authority: CN
Inventors: 胡健; 乔远见; 宋欢; 王宜
Original assignee: Zhuzhou Times Mstar Technology Ltd; South China University of Technology SCUT
Current assignee: Zhuzhou Times Mstar Technology Ltd; South China University of Technology SCUT
Priority date: 2018-04-09
Filing date: 2018-04-09
Publication date: 2020-03-27
Anticipated expiration: 2038-04-09
Also published as: CN108589384A

Abstract

The application provides a novel low-speed water conservancy formula head box for long fiber papermaking, including toper cloth thick liquid ware (1), manifold (2), steady flow chamber (3) and turbulence generator (4), its characterized in that, steady flow chamber (3) are connected to turbulence generator (4) one end, and toper cloth thick liquid ware (1) is connected through manifold (2) in steady flow chamber (3). The equipment is used for manufacturing special paper containing long fibers, has a simple and compact structure, well controls the flow rate of pulp flow, and has a special flow channel design, so that the fiber dispersion is promoted, the fiber flocculation is prevented, and the uniformity of paper sheets is improved.

Description

A novel low-speed water conservancy formula head box for long fiber papermaking

Technical Field

The invention relates to the field of long fiber papermaking, in particular to a novel low-speed hydraulic headbox for long fiber papermaking.

Background

The head box is the key position of paper machine, can effectual dispersion fibre, prevents that the fibre from flocculating, the effectual improvement paper homogeneity, and its structure has decisive effect to the formation and the quality of paper.

In the field of specialty papers, long fibers, especially synthetic fibers of 6mm or more, are often included, and the presence of long fibers makes pulp suspensions more prone to flocculation, resulting in poor paper formation. In the past, the problem of easy flocculation in long fiber papermaking is solved, and a method for reducing the forming concentration, such as inclined wire papermaking or cylinder wire papermaking, is often adopted, wherein the forming concentration can reach 0.01 percent or lower. However, the cylinder mould and inclined mould papermaking and the fourdrinier wire papermaking have great difference in forming mechanism, redundant fourdrinier wire papermaking is arranged in the Z direction of the cylinder mould and inclined mould papermaking fibers, and when the water filtration performance of slurry is poor, the cylinder mould or inclined mould papermaking cannot be used. Fourdrinier papermaking is still the priority of relevant products, such as high-tightness products and the like, according to different requirements of paper final use performance. However, in the field of specialty paper containing long fibers, if a long net is selected, the contradiction that the long fibers are easy to flocculate at a higher forming concentration needs to be solved.

The traditional medium-low speed paper making machines are all open type head boxes, the pulp homogenizing roller is the most commonly used energy dissipation and rectification element in the open type head boxes, and when the flow of pulp in the head boxes is low, the rotation effect of the pulp homogenizing roller is used for homogenizing pulp flow and dispersing fibers. However, in the case of papermaking containing long fibers, such as synthetic fibers of 6mm or more, the distribution roll is liable to carry out slurry hanging, and the developed free liquid surface is liable to flocculate.

The advent of hydraulic headbox was primarily the inability of conventional open headbox to handle higher speeds without the development of a hydraulic headbox for low speed machine applications. In the field of special paper, the capacity required by a manufactured product is small, and a paper machine runs at a low speed under more conditions. When the speed of the paper machine is very low, in order to meet the matching of the pulp wire speed, when the pulp spraying speed is less than 70m/min, the liquid level of a weir pool in a traditional pulp flowing box is very low, and the design of a pulp homogenizing roller needs a certain diameter requirement, so that the liquid level requirement of the pulp homogenizing roller cannot be met by a general open-type pulp flowing box, and the liquid level of the weir pool in the box body is improved by adopting a vacuum extraction method. However, the configuration of the vacuum system makes the head box more complicated, and the problems of slurry hanging of the homogenizing roller and easy flocculation of the free liquid surface can not be avoided.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a novel low-speed hydraulic headbox for long fiber papermaking.

The utility model provides a novel low-speed water conservancy formula head box for long fiber papermaking, includes toper cloth thick liquid ware, manifold, steady flow chamber and turbulence generator, the steady flow chamber is connected to turbulence generator one end, and the steady flow chamber passes through the manifold and connects toper cloth thick liquid ware.

Wherein, turbulent generator one end sets up the runner, and the runner tail end sets up the lip.

Wherein, the inner side wall of the flow channel is corrugated, and the height of the flow channel is 3-50 mm.

Wherein, the manifold is a hose, and the manifold is provided with a hose regulating valve.

Optionally, the manifold is a step diffuser, and the step diffuser is used for uniformly distributing the slurry through the step diffuser after passing through the first stage flow stabilizing chamber.

The height of the flow channel in the flow channel can be adjusted, and the adaptability of the head box to the process is improved by adjusting the height of the flow channel.

Wherein, the whole head box is of a totally-enclosed structure. The novel low-speed hydraulic headbox has a box body in a fully closed structure and can meet the papermaking requirement of a paper machine at a low speed of 10-40 m/min.

Optionally, the flow passage in the flow passage is a sudden expansion contraction type flow passage.

Optionally, the flow channel in the flow channel is a curved flow channel.

The invention relates to a novel low-speed hydraulic headbox for long fiber papermaking. The equipment adopts a totally enclosed novel head box body, a pulp inlet main pipe is connected with a conical pulp distributor, and the conical pulp distributor distributes pulp through a manifold and a turbulence generator and then further disperses even pulp flow through a corrugated flow passage to spray pulp onto the net. The special paper containing long fibers is used for manufacturing the special paper, has a simple and compact structure, better controls the flow rate of pulp flow, and has a special flow channel design, so that the fiber dispersion is promoted, the fiber flocculation is prevented, and the uniformity of paper sheets is improved. The method is mainly used in the field of papermaking containing long fibers, the length range of the fibers is 3-20 mm, and the forming concentration is 0.1-0.5%.

Drawings

FIG. 1 is a schematic view of a novel low speed hydraulic headbox for long fiber papermaking.

Fig. 2 is a schematic view of a new low speed hydraulic headbox for long fiber papermaking example 1.

Fig. 3 is a schematic illustration of a new low speed hydraulic headbox for long fiber papermaking example 2.

Detailed Description

The present invention provides a new low speed hydraulic headbox for long fiber papermaking, which is described in detail below with reference to the accompanying drawings and specific examples.

Fig. 1 shows, a novel low-speed hydraulic headbox for long fiber papermaking, which comprises a conical pulp distributor 1, a manifold 2, a steady flow chamber 3 and a turbulence generator 4, wherein one end of the turbulence generator 4 is connected with the steady flow chamber 3, and the steady flow chamber 3 is connected with the conical pulp distributor 1 through the manifold 2.

One end of the turbulence generator 4 is provided with a flow passage 5, and the tail end of the flow passage 5 is provided with a lip 6.

The inner side wall of the flow channel 5 is corrugated, and the height of the flow channel is 3-50 mm.

The manifold 2 is a hose, and a hose regulating valve 7 is arranged on the manifold 2.

The manifold 2 is a stepped diffuser.

The height of the flow channel in the flow channel 5 is adjustable.

In the using process, the conical pulp distributor 1 can be provided with a reflux device or not, the rear part of the conical pulp distributor 1 is connected with the manifold 2 and the flow stabilizing chamber 3 behind the manifold, and the hose is provided with a hose flow regulating valve 7 which can regulate the flow of each manifold. Through the above elements, uniform and consistent slurry distribution of the cross-width of the slurry is realized. The turbulence generator 4 is connected behind the flow stabilizing chamber 3 to realize high-strength micro-turbulence of the slurry flow, and the corrugated flow channel 5 further disperses the rectified slurry and sprays the slurry through the convergent lip 6 to surf the net.

Example 1

As shown in fig. 2 of embodiment 1, the turbulence generator 4 is connected behind the flow stabilization chamber 3 to realize high-strength micro turbulence of the slurry flow, and then the corrugated flow channel 5 further disperses and rectifies the slurry, and the corrugated flow channel 5 is a "sudden expansion contraction" type flow channel, so that re-flocculation of fibers is reduced, and the slurry directly sprays the slurry to the internet after passing through the flow channel 5.

Example 2

As shown in fig. 3 of embodiment 2, the turbulence generator 4 is connected behind the flow stabilization chamber 3 to realize high-strength micro turbulence of the slurry flow, and then the corrugated flow channel 5 further disperses and rectifies the slurry, and the corrugated flow channel 5 is a "curved" flow channel, so that re-flocculation of fibers is reduced, and the slurry is directly sprayed on the net after passing through the flow channel 5.

Finally, it should be noted that the above examples are only intended to describe the technical solutions of the present invention and not to limit the technical methods, the present invention can be extended in application to other modifications, variations, applications and embodiments, and therefore all such modifications, variations, applications, embodiments are considered to be within the spirit and teaching scope of the present invention.

Claims

1. A novel low-speed hydraulic flow box for long fiber papermaking comprises a conical pulp distributor (1), a manifold (2), a flow stabilization chamber (3) and a turbulence generator (4), and is characterized in that one end of the turbulence generator (4) is connected with the flow stabilization chamber (3), the flow stabilization chamber (3) is connected with the conical pulp distributor (1) through the manifold (2),

wherein, the inner side wall of the flow channel (5) is corrugated, the height of the flow channel is 3-50 mm, and the height of the flow channel (5) can be adjusted;

wherein, the inner flow passage of the flow passage (5) is a sudden expansion contraction type flow passage.

2. The novel low-speed hydraulic headbox for long fiber papermaking according to claim 1, characterized in that the turbulence generator (4) is provided with a flow channel (5) at one end and a lip (6) at the end of the flow channel (5).

3. The new low-speed hydraulic headbox for long fiber papermaking according to claim 1, characterized in that the manifold (2) is a hose and the manifold (2) is provided with a hose regulating valve (7).

4. The new low-speed hydraulic headbox for long fiber papermaking according to claim 1, characterized in that the turbulence generator (4) is a step diffuser.

5. The new low speed hydraulic headbox for long fiber papermaking as claimed in claim 1 wherein the headbox is a totally enclosed structure overall.

6. The new low speed hydraulic headbox for long fiber papermaking according to claim 1, characterized by the fact that the flow channel (5) inner flow channel is a meandering flow channel.