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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On the other hand the bottom lip is fixed.
In hydraulic and Air pad headboxthe discharge velocity from the slice depends directly on the feeding pump. The hydraulic headbox has no air pad, it is fully enclosed. Normally hydraulci headbox is categorized into three types such as open type, air pad type and hydraulic type.
Paper machine headbox
June 26, at In case of air pad headbox a pond level is maintained. Above the level it contains pressurized air. Each layer has different furnish compositions and delivery system. For this reason they commonly known as pressurized headbox. You should accurately maintain the jet-to-wire velocity ratio; it should be in the range of 0. If the headbox does not perform these functions correctly then the quality of the paper will be greatly hampered.
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.
Among them the top lip is adjustable; you can up or down them with hand operating or motor driven. Notify me of new posts by email. Notify me of follow-up comments by email. The slice contains two lips; top lip and bottom lip.
Pulp Paper Mill provides information on pulp mill and paper mill chemical and paper machine. So the design should be properly. April 9, at 9: The headbox jet velocity is very important factor for manufacturing high quality paper.
Hydraulic Headbox – YUELI MACHINERY
Leave a Reply Cancel reply Your email bydraulic will not be published. A well constructed Headbox can provide high quality board and paper and higher productivity. May 24, at The headbox is also known as flowbox.
It contains two or three Rectifier roll. March 26, at 2: The distance between the two lips are called slice opening.
Now a days Hydraulic type headboxes are commonly used in the pulp and paper industry. Your email address will not be published. All the headbox are not suitable for all grade of paper and machine speed. The formation and uniformity of the final headdbox product depends on the dispersion of the fiber and fillers.
It has a significant effect on paper qualities. Jahir you can contact: Normally the hole diameter is about 2 to 4 cm. Enter your email address to receive notifications of new posts by hsadbox. You will get many benefits from the well constructed headbox.
This entry was posted in paper machinery and tagged headbox jet velocity calculationheadbox paperhydraulic headboxpaper machine headbox designpaper machine headbox typesslice lip headbox.