trayHeadbox
The primary purpo of the headbox is to create high-quality paper. After spending much time and money in pulping wood fibers, it would be a shame to ruin this hard work by not putting as much effort into the next pha in order to obtain a finished product of excellent quality.
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The key words to describe a properly functioning headbox is uniformity and profiles. The hydraulic performance of the headbox largely determines the properties of the paper. The headbox controls the web’s profiles, and helps to establish paper properties such as formation. The headbox must distribute stock uniformly across the forming ction, without disturbances, and impart sufficient turbulence to the flow to keep the fibers disperd. Equally important, the headbox must be simple to operate and must remain clean during operation.
New innovative headbox solutions, combined with the preci dimensioning know-how of today, have raid headbox performance to a totally new level. Metso offers a comprehensive lection of headbox concepts designed to address the needs of customers regardless of the paper or board grade, and the machine width or speed involved.
Forming
The lection of board forming concepts should focus on solutions that ensure high efficiency and output. The flexibility to make products across a broad range of grades is also often desired. With flexibility, production can be targeted at the best market potential and the highest value. ntr是什么意思的缩写
Demands regarding the appearance of board products have continued to increa in the packaging market. By and large, print quality is the major factor determining the appeara
nce of the product.
Metso delivers a variety of forming ction configurations to address grade-specific requirements. Our lection includes gap forming, hybrid forming and Multi-Fourdrinier applications, which can be ud for new line installations and rebuilds alike.
Key issues to remember in board production:
Production capacity
Raw material efficiency
Good formation and even fiber angle distribution
惊喜英文怎么写surpri Water consumption and energy savings
如何去头屑 Excellent sheet formation and strength properties
OptiFormer for board
Modern high-speed containerboard machines typically have gap formers as their forming ctions. With an OptiFormer gap former and an OptiFlo Ii headbox, a well-defined and homogeneous headbox jet is fed into a gap between two fabrics, and water is removed efficiently in order to maintain the uniformity of the sheet.
Metso OptiFormer makes it possible to produce lightweight containerboard economically. OptiFormer maintains good runnability and creates a stronger and more homogeneous paper web with good visual appearance despite the often challenging raw material.
Primary OptiFormer is a gap former with a dilution-controlled OptiFlo Ii headbox for a 1 or 2-layer sheet. It is the most common gap former type and has compact layout. Primary OptiFormer is especially suitable for the production of lightweight containerboard grades made of recycled pulp.
OptiFormer with a primary and condary gap former for multi-ply products is supplied with two OptiFlo II headboxes. Two gap former units are needed for high production rates, and for excellent strength and formation. To ensure good profiles, one of the OptiFlo II headboxes is provided with dilution control.
This concept ensures proper layer purity for white top testliner in particular, with excellent coverage and formation, and clearly better planar strength properties than single gap formers. It also offers the potential for very high speeds.
A gap former and Fourdrinier forming ction combination provides an interesting alternative in rebuild cas. This solution eliminates runnability bottlenecks and yields higher speeds and improved quality.
OptiFormer benefits for containerboard
High speed potential
Superior drainage capacity
wentworth earl millerExcellent formation
评价模型 all timeGood strength properties and uniform CD profiles
Uniform visual appearance of the end product
Multi-Fourdrinier
Metso Fourdrinier ensures high efficiency and output. The flexibility to make products across a broad range of grades is also often desired, and white lined chipboard, folding boxboard and coated SBS can all be produced on the same multi-Fourdrinier machine. With this flexibility, production can be targeted at the best market potential and the highest value.
A Fourdrinier forming ction delivers gentle dewatering and high strength yield. The length of the Fourdrinier forming table is optimized for the furnish ud. The concept is cost-effective and provides good product properties throughout its operating range.
Fourdrinier forming can involve 1 to 5 plies, enabling a wide basis weight range with good sheet formation. The heaviest ply is often equipped with a ValFormer top former unit. Advanced dilution basis weight profiling can also be ud for efficient profile control with the heaviest ply.
Metso’s extensive product range also provides rebuild solutions for traditional Fourdrinier
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formers to improve end product quality and output, or to enter a new basis weight range or board grade.
Fourdrinier benefits汤圆英文
