WO2019195973A1 - Low-speed hydraulic headbox for long fiber papermaking - Google Patents

Low-speed hydraulic headbox for long fiber papermaking Download PDF

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Publication number
WO2019195973A1
WO2019195973A1 PCT/CN2018/082254 CN2018082254W WO2019195973A1 WO 2019195973 A1 WO2019195973 A1 WO 2019195973A1 CN 2018082254 W CN2018082254 W CN 2018082254W WO 2019195973 A1 WO2019195973 A1 WO 2019195973A1
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Prior art keywords
speed hydraulic
headbox
flow
long
manifold
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PCT/CN2018/082254
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French (fr)
Chinese (zh)
Inventor
胡健
乔远见
宋欢
王宜
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华南理工大学
株洲时代华先材料科技有限公司
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Priority to PCT/CN2018/082254 priority Critical patent/WO2019195973A1/en
Publication of WO2019195973A1 publication Critical patent/WO2019195973A1/en

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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines

Definitions

  • the invention relates to the field of long fiber papermaking, in particular to a novel low speed hydraulic headbox for long fiber papermaking.
  • the headbox is a key part of the paper machine, which can effectively disperse the fibers, prevent fiber flocculation, effectively improve the sheet formation, and its structure plays a decisive role in the formation and quality of the sheet.
  • long fibers are often included, especially synthetic fibers of 6 mm or more.
  • the presence of long fibers makes the slurry suspension easier to flocculate, resulting in extremely poor paper formation.
  • the problem of easy flocculation of long-fiber papermaking has been solved, and a method of reducing the forming concentration, such as oblique netting or rotary netting, is often used, and the forming concentration can be 0.01% or less.
  • round wire, inclined net papermaking and long net papermaking have great differences in the forming mechanism.
  • the round mesh and inclined net papermaking fibers are arranged in the direction of extra long net paper, and when the slurry drainage performance is poor, it cannot be Use a round or inclined net to make paper.
  • the traditional medium and low speed paper machines are all open headboxes.
  • the homogenizing rolls are the most commonly used energy dissipating and rectifying elements in the open headbox. When the flow rate of the slurry in the headbox is low, it is uniform. The rotation of the paddle roller acts to smooth the slurry flow and disperse the fibers.
  • the homogenizing rolls are easy to hang, and the free liquid surface developed, the free liquid surface is easy to flocculate.
  • the present invention proposes a new low speed hydraulic headbox for long fiber papermaking.
  • a novel low-speed hydraulic headbox for long fiber papermaking comprising a conical grouting device, a manifold, a steady flow chamber and a turbulence generator, wherein the turbulent flow generator is connected to the steady flow chamber at one end, and the steady flow chamber passes through
  • the branch pipe is connected to the conical grout.
  • a flow channel is arranged at one end of the turbulence generator, and a lip is provided at the tail end of the flow channel.
  • the inner side wall of the flow channel is corrugated, and the height of the flow channel is 3-50 mm.
  • the manifold is a hose, and the manifold is provided with a hose regulating valve.
  • the manifold is a step diffuser, and the step diffuser is again smeared by the step diffuser after passing through a constant flow chamber.
  • the height of the flow channel in the flow channel can be adjusted, and the adaptability of the headbox to the process is improved by adjusting the height of the flow channel.
  • the new low-speed hydraulic headbox can meet the requirements of paper machine low speed of 10-40m/min under the fully enclosed structure.
  • the flow channel in the flow channel is a sudden expansion and contraction flow channel.
  • the flow channel in the flow channel is a curved flow channel.
  • a novel low speed hydraulic headbox for long fiber papermaking by the present invention adopts a fully enclosed new headbox body, and the slurry inlet pipe is connected with a cone-shaped pulper. After the cone-shaped cloth is slurryed by a multi-tubular tube and a turbulent flow generator, the slurry is further dispersed and evenly distributed through the corrugated flow channel. Jet spray online. It is used to manufacture special paper containing long fibers. Its structure is brief, compact, better control of the flow rate of the slurry flow, special flow channel design, promote fiber dispersion, prevent fiber flocculation, and improve the sheet formation. It is mainly used in the papermaking field containing long fibers with a fiber length ranging from 3 to 20 mm and a forming concentration of 0.1 to 0.5%.
  • Figure 1 is a schematic diagram of a new low-speed hydraulic headbox for long fiber papermaking.
  • Figure 2 is a schematic view of a first embodiment of a novel low speed hydraulic headbox for long fiber papermaking.
  • Figure 3 is a schematic view of a second embodiment of a novel low speed hydraulic headbox for long fiber papermaking.
  • Figure 1 shows a new low-speed hydraulic headbox for long fiber papermaking, comprising a conical grout 1, a manifold 2, a steady flow chamber 3 and a turbulence generator 4, one end of the turbulence generator 4
  • the stabilizing chamber 3 is connected, and the stabilizing chamber 3 is connected to the conical grout 1 through the manifold 2.
  • the flow path 5 is disposed at one end of the turbulence generator 4, and the lip 6 is disposed at the end of the flow path 5.
  • the inner side wall of the flow channel 5 is corrugated, and its flow channel height is 3-50 mm.
  • the manifold 2 is a hose, and the manifold 2 is provided with a hose regulating valve 7.
  • the manifold 2 is a step diffuser.
  • the height of the flow passage in the flow passage 5 can be adjusted.
  • the conical grout 1 can be provided with a reflow device or no reflow device.
  • the conical grout 1 is connected to the manifold 2, and the manifold is stabilized.
  • the hose is equipped with a hose flow regulation.
  • the valve 7 can adjust the flow rate of each branch pipe.
  • the steady flow chamber 3 is connected to the turbulence generator 4 to achieve high-intensity micro-turbulence of the slurry flow, and then the corrugated flow passage 5 further disperses the rectifying slurry, and the corrugated flow path 5 is a "sudden expansion and contraction" type flow passage, thereby reducing the re-flocculation of the fibers, and the slurry passes through the flow passage 5 and directly sprays the net.
  • the steady flow chamber 3 is connected to the turbulence generator 4 to achieve high-intensity micro-turbulence of the slurry flow, and the corrugated flow passage 5 is further dispersed to rectify the slurry, and the corrugated flow path 5 is a "bending" type flow passage, thereby reducing the re-flocculation of the fibers, and the slurry passes through the flow passage 5 and directly sprays the net.

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Abstract

A low-speed hydraulic headbox for long fiber papermaking, comprising a conical pulp distribution device (1), a manifold (2), a flow stabilizing chamber (3), and a turbulence generator (4). One end of the turbulence generator (4) is connected to the flow stabilizing chamber (3). The flow stabilizing chamber (3) is connected to the pulp distribution device (1) by means of the manifold (2). The headbox is used for manufacturing special paper containing long fibers, has a simple and compact structure, and can better control the flow speed of a pulp flow; the design of a special flow channel is beneficial to promote fiber dispersion, prevent fiber flocculation, and improve the uniformity of a paper sheet.

Description

[根据细则37.2由ISA制定的发明名称]　用于长纤维造纸的低速水力式流浆箱[Name of invention made by ISA according to Rule 37.2] Low-speed hydraulic headbox for long-fiber papermaking 技术领域Technical field
本发明涉及长纤维造纸领域，尤其是一种用于长纤维造纸的新型低速水力式流浆箱。The invention relates to the field of long fiber papermaking, in particular to a novel low speed hydraulic headbox for long fiber papermaking.
背景技术Background technique
流浆箱是纸机的关键部位，能够有效的分散纤维，防止纤维絮聚，有效的提高纸页匀度，其结构对纸页的形成和质量具有决定性的作用。The headbox is a key part of the paper machine, which can effectively disperse the fibers, prevent fiber flocculation, effectively improve the sheet formation, and its structure plays a decisive role in the formation and quality of the sheet.
特种纸领域中，常含有长纤维，尤其是6mm以上的合成纤维，长纤维的存在使浆料悬浮液更易于絮聚，导致纸张匀度极差。以往解决长纤维造纸的易于絮聚的问题，常采用降低成形浓度的方法，如斜网造纸或圆网造纸，其成形浓度可达到0.01％或更低。但圆网、斜网造纸与长网造纸，在成形机理上有很大的差别，圆网、斜网造纸纤维Z向排布多余长网造纸，且当浆料滤水性能较差时，无法使用圆网或斜网造纸。根据纸张最终使用性能的要求不同，长网造纸仍然是相关产品优先选择，如高紧度产品等。但在含有长纤维的特种纸领域，如果选择长网，需要解决，在较高成形浓度下，长纤维易于絮聚的矛盾。In the field of specialty papers, long fibers are often included, especially synthetic fibers of 6 mm or more. The presence of long fibers makes the slurry suspension easier to flocculate, resulting in extremely poor paper formation. In the past, the problem of easy flocculation of long-fiber papermaking has been solved, and a method of reducing the forming concentration, such as oblique netting or rotary netting, is often used, and the forming concentration can be 0.01% or less. However, round wire, inclined net papermaking and long net papermaking have great differences in the forming mechanism. The round mesh and inclined net papermaking fibers are arranged in the direction of extra long net paper, and when the slurry drainage performance is poor, it cannot be Use a round or inclined net to make paper. Depending on the final performance requirements of the paper, Long Net Paper is still the preferred choice for related products, such as high-tightness products. However, in the field of specialty papers containing long fibers, if a long net is selected, it needs to be solved, and at a higher forming concentration, the long fibers are prone to flocculation.
传统的中低速造纸机，均为开放式流浆箱，匀浆辊是开放式流浆箱中最常用的消能和整流元件，当流浆箱中浆料的流送较低时，通过匀浆辊的转动作用，起到匀整浆流、分散纤维的作用。但针对含有长纤维的造纸情况，如6mm以上的合成纤维，匀浆辊易于挂浆，且开发的自由液面，自由液面易于絮聚。The traditional medium and low speed paper machines are all open headboxes. The homogenizing rolls are the most commonly used energy dissipating and rectifying elements in the open headbox. When the flow rate of the slurry in the headbox is low, it is uniform. The rotation of the paddle roller acts to smooth the slurry flow and disperse the fibers. However, in the case of papermaking containing long fibers, such as synthetic fibers of 6 mm or more, the homogenizing rolls are easy to hang, and the free liquid surface developed, the free liquid surface is easy to flocculate.
水力式流浆箱的出现主要是传统的开放式流浆箱无法应对更高的车速，而并没有专门开发水力式流浆箱在低速纸机上的应用。特种纸领域，受制产品所需产能较小，更多情况下纸机为低速运行。当纸机的车速很低时，为满足浆网速的匹配，当喷浆速度小于70m/min时，传统流浆箱内的堰池液位就很低，而匀浆辊的设计有需要一定的直径要求，因此一般的敞开式流浆箱无法满足匀浆辊的液位要求，常采用抽取真空的办法提高箱体内堰池的液位。但真空系统的配置，则流浆箱更为复杂，且同样无法回避匀浆辊挂浆和自由液面易絮聚的问题。The emergence of hydraulic headboxes is mainly due to the fact that conventional open headboxes cannot cope with higher speeds, and there is no specific development of hydraulic headboxes for low speed paper machines. In the field of specialty papers, the required production capacity of the products is small, and in most cases, the paper machine runs at a low speed. When the speed of the paper machine is very low, in order to meet the matching of the speed of the pulp network, when the spray speed is less than 70m/min, the liquid level in the traditional headbox is very low, and the design of the homogenizing roller needs to be certain. The diameter requirements, so the general open headbox can not meet the liquid level requirements of the homogenizing roller, often using vacuum to improve the liquid level in the tank. However, the configuration of the vacuum system makes the headbox more complicated, and it is also impossible to avoid the problem of homogenizing roller hanging and free liquid surface flocculation.
发明内容Summary of the invention
为克服现有的缺陷，本发明提出一种用于长纤维造纸的新型低速水力式流浆箱。To overcome the existing deficiencies, the present invention proposes a new low speed hydraulic headbox for long fiber papermaking.
一种用于长纤维造纸的新型低速水力式流浆箱，包括锥形布浆器、多支管、稳流室和湍流发生器，所述湍流发生器一端连接稳流室，稳流室通过多支管连接锥形布浆器。A novel low-speed hydraulic headbox for long fiber papermaking, comprising a conical grouting device, a manifold, a steady flow chamber and a turbulence generator, wherein the turbulent flow generator is connected to the steady flow chamber at one end, and the steady flow chamber passes through The branch pipe is connected to the conical grout.
其中，湍流发生器一端设置流道，流道尾端设置唇口。Wherein, a flow channel is arranged at one end of the turbulence generator, and a lip is provided at the tail end of the flow channel.
其中，流道内侧壁为波纹状，其流道高度为3—50mm。The inner side wall of the flow channel is corrugated, and the height of the flow channel is 3-50 mm.
其中，多支管为软管，多支管上设置软管调节阀。Among them, the manifold is a hose, and the manifold is provided with a hose regulating valve.
可选地，多支管为阶梯扩散器，阶梯扩散器经一段稳流室后再次通过阶梯扩散器匀整布浆。Optionally, the manifold is a step diffuser, and the step diffuser is again smeared by the step diffuser after passing through a constant flow chamber.
其中，流道内流道的高度可调节，通过调节流道的高度，提高流浆箱对工艺的适应性。Among them, the height of the flow channel in the flow channel can be adjusted, and the adaptability of the headbox to the process is improved by adjusting the height of the flow channel.
其中，流浆箱整体为全封闭结构。该种新型低速水力式流浆箱，箱体在全封闭结构下，能够满足纸机低速10—40m/min的抄造要求。Among them, the headbox is entirely enclosed. The new low-speed hydraulic headbox can meet the requirements of paper machine low speed of 10-40m/min under the fully enclosed structure.
可选地，流道内流道为突扩收缩式流道。Optionally, the flow channel in the flow channel is a sudden expansion and contraction flow channel.
可选地，流道内流道为弯曲式流道。Optionally, the flow channel in the flow channel is a curved flow channel.
通过本发明的一种用于长纤维造纸的新型低速水力式流浆箱。该设备采用全封闭式的新型流浆箱箱体，进浆总管连接锥形布浆器，锥形布浆器后经多支管、湍流发生器布浆后，经波纹状流道进一步分散匀整浆流喷浆上网。其用于制造含有长纤维的特种纸，结构简介、紧凑，较好的控制浆流的流速，特殊流道的设计，促进纤维分散，防止纤维絮聚，提高纸页的匀度。其主要用于含有长纤维的造纸领域，纤维长度范围为3---20mm，成形浓度为0.1—0.5％。A novel low speed hydraulic headbox for long fiber papermaking by the present invention. The equipment adopts a fully enclosed new headbox body, and the slurry inlet pipe is connected with a cone-shaped pulper. After the cone-shaped cloth is slurryed by a multi-tubular tube and a turbulent flow generator, the slurry is further dispersed and evenly distributed through the corrugated flow channel. Jet spray online. It is used to manufacture special paper containing long fibers. Its structure is brief, compact, better control of the flow rate of the slurry flow, special flow channel design, promote fiber dispersion, prevent fiber flocculation, and improve the sheet formation. It is mainly used in the papermaking field containing long fibers with a fiber length ranging from 3 to 20 mm and a forming concentration of 0.1 to 0.5%.
附图说明DRAWINGS
以下，结合附图来详细说明本发明的实施方案，其中：Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, in which:
图1为用于长纤维造纸的新型低速水力式流浆箱示意图。Figure 1 is a schematic diagram of a new low-speed hydraulic headbox for long fiber papermaking.
图2为用于长纤维造纸的新型低速水力式流浆箱实施例1示意图。Figure 2 is a schematic view of a first embodiment of a novel low speed hydraulic headbox for long fiber papermaking.
图3为用于长纤维造纸的新型低速水力式流浆箱实施例2示意图。Figure 3 is a schematic view of a second embodiment of a novel low speed hydraulic headbox for long fiber papermaking.
实施发明的最佳方式The best way to implement the invention
下面结合附图和具体实施例对本发明提供的一种用于长纤维造纸的新型低速水力式流浆箱进行详细描述。A novel low-speed hydraulic headbox for long fiber papermaking provided by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
图1示出，一种用于长纤维造纸的新型低速水力式流浆箱，包括锥形布浆器1、多支管2、稳流室3和湍流发生器4，所述湍流发生器4一端连接稳流室3，稳流室3通过多支管2连接锥形布浆器1。Figure 1 shows a new low-speed hydraulic headbox for long fiber papermaking, comprising a conical grout 1, a manifold 2, a steady flow chamber 3 and a turbulence generator 4, one end of the turbulence generator 4 The stabilizing chamber 3 is connected, and the stabilizing chamber 3 is connected to the conical grout 1 through the manifold 2.
湍流发生器4一端设置流道5，流道5尾端设置唇口6。The flow path 5 is disposed at one end of the turbulence generator 4, and the lip 6 is disposed at the end of the flow path 5.
流道5内侧壁为波纹状，其流道高度为3—50mm。The inner side wall of the flow channel 5 is corrugated, and its flow channel height is 3-50 mm.
多支管2为软管，多支管2上设置软管调节阀7。The manifold 2 is a hose, and the manifold 2 is provided with a hose regulating valve 7.
多支管2为阶梯扩散器。The manifold 2 is a step diffuser.
流道5内流道的高度可调节。The height of the flow passage in the flow passage 5 can be adjusted.
使用过程中，锥形布浆器1可设置回流装置，也可不设置回流装置，锥形布浆器1后连接多支管2，以及多支管后稳流室3，软管上装有软管流量调节阀7，可调节各个支管的流量。通过以上的各个元件，实现浆料的横幅均匀一致布浆。稳流室3后连接湍流发生器4，实现浆流的高强微湍动，而后的波纹状流道5进一步的分散整流浆料，而后经收敛唇口6喷浆上网。During use, the conical grout 1 can be provided with a reflow device or no reflow device. The conical grout 1 is connected to the manifold 2, and the manifold is stabilized. The hose is equipped with a hose flow regulation. The valve 7 can adjust the flow rate of each branch pipe. Through the above various components, the banner of the slurry is uniformly uniformly pulverized. After the steady flow chamber 3 is connected to the turbulence generator 4, high-strength micro-turbulence of the slurry flow is realized, and then the corrugated flow passage 5 further disperses the rectifying slurry, and then sprays the net through the converging lip 6.
实施例1Example 1
如图2所示的实施例1，稳流室3后连接湍流发生器4，实现浆流的高强微湍动，而后的波纹状流道5进一步的分散整流浆料，且该波纹状流道5为“突扩收缩”式流道，从而减少纤维的再絮聚，浆料通过流道5后直接喷浆上网。In the embodiment 1 shown in FIG. 2, the steady flow chamber 3 is connected to the turbulence generator 4 to achieve high-intensity micro-turbulence of the slurry flow, and then the corrugated flow passage 5 further disperses the rectifying slurry, and the corrugated flow path 5 is a "sudden expansion and contraction" type flow passage, thereby reducing the re-flocculation of the fibers, and the slurry passes through the flow passage 5 and directly sprays the net.
实施例2Example 2
如图3所示的实施例2，稳流室3后连接湍流发生器4，实现浆流的高强微湍动，而后的波纹状流道5进一步的分散整流浆料，且该波纹状流道5为“弯曲”式流道，从而减少纤维的再絮聚，浆料通过流道5后直接喷浆上网。In the embodiment 2 shown in FIG. 3, the steady flow chamber 3 is connected to the turbulence generator 4 to achieve high-intensity micro-turbulence of the slurry flow, and the corrugated flow passage 5 is further dispersed to rectify the slurry, and the corrugated flow path 5 is a "bending" type flow passage, thereby reducing the re-flocculation of the fibers, and the slurry passes through the flow passage 5 and directly sprays the net.
最后应说明的是，以上实施例仅用以描述本发明的技术方案而不是对本技术方法进行限制，本发明在应用上可以延伸为其他的修改、变化、应用和实施例，并且因此认为所有这样的修改、变化、应用、实施例 都在本发明的精神和教导范围内。Finally, it should be noted that the above embodiments are only used to describe the technical solutions of the present invention and are not intended to limit the technical methods. The present invention may be extended to other modifications, changes, applications, and embodiments, and thus all such Modifications, variations, applications, and embodiments are within the spirit and scope of the invention.

Claims (9)

  1. 一种用于长纤维造纸的新型低速水力式流浆箱，包括锥形布浆器(1)、多支管(2)、稳流室(3)和湍流发生器(4)，其特征在于，所述湍流发生器(4)一端连接稳流室(3)，稳流室(3)通过多支管(2)连接锥形布浆器(1)。A novel low-speed hydraulic headbox for long fiber papermaking, comprising a conical grout (1), a manifold (2), a steady flow chamber (3) and a turbulence generator (4), characterized in that One end of the turbulence generator (4) is connected to the steady flow chamber (3), and the steady flow chamber (3) is connected to the conical grout (1) through the manifold (2).
  2. 根据权利要求1所述的用于长纤维造纸的新型低速水力式流浆箱，其特征在于，所述湍流发生器(4)一端设置流道(5)，流道(5)尾端设置唇口(6)。A novel low-speed hydraulic headbox for long-fiber papermaking according to claim 1, wherein said turbulence generator (4) is provided with a flow passage (5) at one end and a lip at the rear end of the flow passage (5). Mouth (6).
  3. 根据权利要求2所述的用于长纤维造纸的新型低速水力式流浆箱，其特征在于，所述流道(5)内侧壁为波纹状，其流道高度为3—50mm。The novel low-speed hydraulic headbox for long-fiber papermaking according to claim 2, wherein the inner side wall of the flow passage (5) is corrugated, and the flow passage height is 3-50 mm.
  4. 根据权利要求1所述的用于长纤维造纸的新型低速水力式流浆箱，其特征在于，所述多支管(2)为软管，多支管(2)上设置软管调节阀(7)。A novel low-speed hydraulic headbox for long-fiber papermaking according to claim 1, wherein said manifold (2) is a hose, and a manifold regulating valve (7) is provided on the manifold (2) .
  5. 根据权利要求1所述的用于长纤维造纸的新型低速水力式流浆箱，其特征在于，所述多支管(2)为阶梯扩散器。A novel low speed hydraulic headbox for long fiber papermaking according to claim 1 wherein said manifold (2) is a step diffuser.
  6. 根据权利要求3所述的用于长纤维造纸的新型低速水力式流浆箱，其特征在于，所述流道(5)内流道的高度可调节。A novel low speed hydraulic headbox for long fiber papermaking according to claim 3, wherein the height of the flow passage in the flow passage (5) is adjustable.
  7. 根据权利要求1所述的用于长纤维造纸的新型低速水 力式流浆箱，其特征在于，所述流浆箱整体为全封闭结构。A novel low speed hydraulic headbox for long fiber papermaking according to claim 1 wherein said headbox is a fully enclosed structure as a whole.
  8. 根据权利要求6所述的用于长纤维造纸的新型低速水力式流浆箱，其特征在于，所述流道(5)内流道为突扩收缩式流道。A novel low-speed hydraulic headbox for long-fiber papermaking according to claim 6, wherein the flow passage (5) has a sudden expansion and contraction flow passage.
  9. 根据权利要求6所述的用于长纤维造纸的新型低速水力式流浆箱，其特征在于，所述流道(5)内流道为弯曲式流道。A novel low-speed hydraulic headbox for long-fiber papermaking according to claim 6, wherein the flow passage (5) has a curved flow passage.
PCT/CN2018/082254 2018-04-09 2018-04-09 Low-speed hydraulic headbox for long fiber papermaking WO2019195973A1 (en)

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US3954558A (en) * 1973-07-13 1976-05-04 J. M. Voith Gmbh Feeding device for paper machines
CN1038139A (en) * 1988-05-27 1989-12-20 维美德-阿尔斯特罗姆有限公司 Paper machine or board machine hydraulic pressure flow box
CN1052714A (en) * 1989-12-22 1991-07-03 维美德-卡胡拉有限公司 Paper, cardboard or pulp dryer method of operation and device
CN1436263A (en) * 2000-06-13 2003-08-13 麦特索纸业公司 Headbox of paper machine or such
CN102365407A (en) * 2009-03-27 2012-02-29 美卓造纸机械公司 Flow pipe for a turbulence generator of the head box of a fiber web machine and a method for manufacturing a flow pipe for a turbulence generator of the head box of a fiber web machine and a turbulence generator of the head box of a fiber web machine
CN102575426A (en) * 2009-08-10 2012-07-11 沃依特专利有限责任公司 Method for operating a sheet-forming unit, and sheet-forming unit
CN102575425A (en) * 2009-08-10 2012-07-11 沃依特专利有限责任公司 Headbox, sheet-forming unit having a headbox and method for operating a sheet-forming unit
CN102947504A (en) * 2010-06-22 2013-02-27 沃依特专利有限责任公司 Headbox for a machine for producing a fibre-material web

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3954558A (en) * 1973-07-13 1976-05-04 J. M. Voith Gmbh Feeding device for paper machines
CN1038139A (en) * 1988-05-27 1989-12-20 维美德-阿尔斯特罗姆有限公司 Paper machine or board machine hydraulic pressure flow box
CN1052714A (en) * 1989-12-22 1991-07-03 维美德-卡胡拉有限公司 Paper, cardboard or pulp dryer method of operation and device
CN1436263A (en) * 2000-06-13 2003-08-13 麦特索纸业公司 Headbox of paper machine or such
CN102365407A (en) * 2009-03-27 2012-02-29 美卓造纸机械公司 Flow pipe for a turbulence generator of the head box of a fiber web machine and a method for manufacturing a flow pipe for a turbulence generator of the head box of a fiber web machine and a turbulence generator of the head box of a fiber web machine
CN102575426A (en) * 2009-08-10 2012-07-11 沃依特专利有限责任公司 Method for operating a sheet-forming unit, and sheet-forming unit
CN102575425A (en) * 2009-08-10 2012-07-11 沃依特专利有限责任公司 Headbox, sheet-forming unit having a headbox and method for operating a sheet-forming unit
CN102947504A (en) * 2010-06-22 2013-02-27 沃依特专利有限责任公司 Headbox for a machine for producing a fibre-material web

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