A hydraulic headbox is designed to deliver a uniform, low consistency stock stream to the Fourdrinier wire. It is important to monitor the geometry of the stock jet. Flow modeling of a hydraulic headbox with a tapered manifold, a large array of diffuser cross-machine direction are dependent on the headbox design and. Abstract—An experimental study of the flow in a modeled hydraulic headbox of papermaking machines was performed. The turbulent boundary layer generated .
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Hydraulic Headbox – YUELI MACHINERY
The paper machine headbox slice is a full width nozzle with a completely adjustable opening to give the desired rate of flow. The hydraulic headbox has no air pad, it is fully enclosed. You will get many benefits from the well constructed headbox.
May 24, at On the other hand the bottom lip is fixed. The head determines the slice jet speed. Notify me of new posts by email. Paper machine headbox Posted on December 16, by admin. It has a significant effect on paper qualities.
Moreover multi-layer hydraulic headbox is available which is designed for making tissue paper and lightweight containerboard. It contains two or three Rectifier roll. I have 6 month experience at paper machine in paper mill can somebody guide me for a new job.
Among them the top lip is adjustable; you can up or down them with hand operating or motor driven. It is also known as hollow perforated roll or holey roll. This entry was posted in paper machinery and tagged headbox jet velocity calculationheadbox paperhydraulic headboxpaper machine headbox designpaper machine headbox typesslice lip headbox.
All the headbox are not suitable for all grade of paper and machine speed. The stock level is known as head, which is controlled by air pressure.
Paper machine headbox
The paper machine headbox is an equipment that supply very low consistency stock into the forming section uniformly. It can improve formation and paper quality, reduce number of breaks and downtime, fewer pinholes, dirt spots, improve runnability, increase machine speed, stabilized paper caliperimprove water removal, and reduce chemical cost.
Normally the headbox is categorized into three types such as open type, air pad type and hydraulic type. The headbox is also known as flowbox. Notify me of follow-up comments by email. The formation and uniformity of the final paper product depends on the dispersion of the fiber and fillers.
If the headbox does not perform these functions correctly then the quality of the paper will be greatly hampered. So the design should be properly. The headbox jet velocity is very important factor for manufacturing high quality paper. Normally the hole diameter is about 2 to 4 cm.
All these properties are achievable, if the CD basis headgox profile, main fiber direction, uniform formation, flatness, etc.
Each layer has different furnish compositions and delivery system. The slice contains two lips; top lip and bottom lip. Your email address will not be published. Above the level it contains pressurized air.
Hydraulic headbox with dilution before diffuser
The distance between the two lips are called slice opening. Leave a Reply Cancel reply Your email address will not be published. Jahir you can contact: In hydraulic and Air pad headboxthe discharge velocity from the slice depends directly on the feeding pump.
A well constructed Hyddaulic can provide high quality board and paper and higher productivity. Hydrauloc about Paper mill Pulp mill Gallery contact us. This slice opening controls the stock jet velocity which is vital for paper formation. April 9, at 9: Pulp Paper Mill provides information on pulp mill and paper mill chemical and paper machine.
This roll are used in paper machine headbox to control htdraulic the even out flow irregularities and to create turbulence to keep the fiber dispersed up to the slice opening.
In case of hydtaulic pad headbox a pond level is maintained. Now a days Hydraulic type headboxes are commonly used in the pulp and paper industry. For this reason they commonly known hudraulic pressurized headbox. Enter your email address to receive notifications of new posts by email.
You should accurately maintain the jet-to-wire velocity ratio; it should be in the range of 0. March 26, at 2: The furnish delivery system varies on the construction of the headbox. June 26, at