As the key equipment of paper forming, the headbox has always been regarded as the heart of the paper machine.

The development of headbox is also advancing with the times. New concepts have been changing, such as homogenizing roller, semi-hydraulic, full hydraulic, lip plate banner control, dilution water banner control, multi-layer headbox, water layer, etc.

An authoritative consulting company pointed out: From the perspective of the Asia-Pacific region, the proportion of paper machines that have been in operation for more than 10 years has begun to increase, and in the next few years, with the increase in the operating age of paper machines, the paper market in the Asia-Pacific region needs more funds. For paper machine maintenance and upgrading.

Paper machine transformation and upgrading, funds allow, the replacement of the headbox is a good choice.

The transformation of the headbox, so that the old headbox to rejuvenate the vitality, we use "remanufacturing" to define will be more scientific. The remanufacturing of the headbox is also a wise choice.

Big finger equipment, born in papermaking and familiarity with papermaking, sprouted the original intention to verify various illusions.

Big Finger Equipment added dilution water system to imported headbox in 2002 to improve banner quantification. After that, in addition to research and development, promotion of the collection of the headbox, but also for the industry to provide headbox remanufacturing services.

The series of mature cases also provide a cost-effective option for the transformation of paper machines.

Case one:

VALMET SYMFLO HB, lip 4230mm, a customer in South China.

Upgrading provided by Big Finger Equipment: Added dilution water banner control system.

Transformation effect: Banner 2sigma improvement rate is greater than 50%.

 

 

Case two:

VOITH, lip 3450mm, moved from Fujian to Shandong in 2020.

Upgrade provided by big finger equipment: restore factory accuracy; Increase dilution water banner control; Replace the small lip plate with a new structure, and change the small lip plate pneumatic tire pressure to mechanical disc spring pressure.

Transformation effect: simplified control and improved maneuverability. 70GSM, banner 2sigma<0.3.

 

 

Case three:

A domestic brand, lip 5250mm, Shandong customers.

Upgrading provided by big finger equipment: improving mechanical and polishing accuracy; Add dilution water banner control system; Replace the small lip plate with a new structure, and change the small lip plate pneumatic tire pressure to mechanical disc spring pressure.

Closed air cushion, changed to full flow, increase the pulse attenuator, stable longitudinal quantitative at the same time, reduce the rot slurry.

Case four:

B & H headbox, lip 4275mm, a customer in Guangxi.

The original design and production of 40gsm special paper with a speed of 800 m/min. Due to the strategic adjustment of the company's product structure, the production of towel paper was changed. After the reform, the step diffusion and turbulence generator are often blocked (as shown in the figure below), which seriously affects the production.

The solution provided by the big finger equipment: through calculation and analysis, it is judged that the cause of blockage is that the change of slurry ratio and vehicle speed causes the slurry flow rate in the headbox to be too low, resulting in slurry hanging and blockage.

Solution: Replace the inlet plug-ins of all step diffusion and turbulence generators (POM plug-in is shown in the figure below) to increase the flow rate.

 

Case Five:

BELLMER EQUAL jetter headbox, lip 4875mm, a customer in Shandong.

Paper machine transformation, product structure adjustment, headbox flow increased; the original dilution water valve failure rate is high.

Upgrading provided by the big finger equipment: while restoring the factory accuracy, replace the turbulence generator with a larger flow rate and add floating plates; Replace the dilution water valve.

 

The above are some typical cases

With the rapid development of the paper industry in the past two decades, the rapid launch of high-speed wide-width paper machines, some paper machines are also being eliminated, but as a fast-growing paper market, most paper machines have their relatively strong vitality.

A paper machine with a slightly longer running time has more or less problems with its headbox:

Such as the corrosion of the worm gear, the deformation of the lip plate, the tilt of the dot, the aging of the seal and other mechanical structures, need to be optimized;

When the product or speed needs to be adjusted significantly, it is important to evaluate the adaptability of the headbox;

Compared with competitors, how to get better evenness and better banner quantitative;

Can the existing headbox be changed into a multi-layer headbox, and the paper has the performance of a screen stacking machine......

These problems are paper workers in constant thinking and urgent need to solve.

The remanufacturing of the headbox is a wise choice, but it needs to be comprehensively evaluated and weighed. Whether it's remanufactured or replaced. The investment in the headbox is always worth the money.