Pulp and Paper Industry
Paper plays a key role in our daily life and papers have been used for many years now. Papers are made with the pulp of the woods, which is an Eco-friendly product.
Paper is made through the following processes:
1) Pulping procedure will be done to separate and clean the fibers
2) Refining procedure will be followed after pulping processes
3) Dilution process to form a thin fiber mixture
4) Formation of fibers on a thin screened
5) Pressurization to enhance the density of the material
6) Drying to eliminate the density of materials
7) Finishing procedure to provide a suitable surface
About recycled fiber papermaking process:
1) pulp and paper process
Paper for recycling is mixed with processed water and then stirred in a giant stainless steel vat, called a pulper, to make a fiber suspension. Impurities are removed using a series of screens( such as wedge wire screen)
2) Diluting paper fibers
At the start of the papermaking process, the solution comprises roughly 1% fiber and 99% water. Diluting the paper fibers this way allows us to make thin, uniform paper.
3) Wire section
At the wet end of the paper, the machine sits the headbox, which distributes a uniform jet of watery stock.
The liquid falls onto the wire or forming fabric. Beneath the wire, foils (short for hydrofoils) remove water and improve fiber uniformity, ensuring that the fibers weave together in a tight mat.
The wire passes over suction boxes that vacuum out the water, leaving a soft mat of pulp that forms the paper sheet, also known as the paper web. By now the wire has traveled 30-40 meters. In a couple of seconds, the water content has dropped to 75-80%, and the web has lost its wet sheen.
4) Press section
The next stage of water removal consists of passing the paper web through a series of nip rollers that squeeze the water out of the pulp mat. This pressure also compresses the fibers so they intertwine to form a dense, smooth sheet. At this stage, the water content has reduced to between 45 and 55%.
5) How paper is dried
The paper web now travels through an enclosed space containing a number of steam-heated drying cylinders. They are warmed up to 130ºC using steam heat to ensure that the paper is now 80 to 85% dry.
Wet sizing solution is now applied to the paper in order to add a thin layer of starch to the surface. Starch contributes to stiffness and the bonding of the fibers within the sheet of paper.
After the sizing is applied, the paper passes through another set of heated drying cylinders. In all, the paper web may travel 400 meters through the dry end. In the process, it will lose roughly 93% of its water.
6) Paper finishing
To give the containerboard a smooth and glossy surface to optimize it for printing, the paper passes through a set of smooth rollers, which can be hard or soft, that press the paper, embossing a smooth face on the paper surface.
7): Paper winding
After completing its 500-meter journey, the paper exits from the paper machine and is automatically wound onto a jumbo reel, which can weigh 60 tonnes and be over seven meters long.
The efficient separation of solid particles from liquids is one of the main concerns in the Pulp/Paper industry. Hebei Yuanlv high-quality cartridges provide the solution for efficient separation processes including centrifugal cartridges and static cartridges.
Pulp & paper and recycling industries use screens for water cleaning, dewatering, clarification, pulp screening, and fractionation, drying and other separation processes. With our wide range of wedge wire screen material and sizes, we cooperate closely with our customers to ensure the ideal combination is choosed to create the optimum screens for the filtration stages.
Clarification of Water
Cleaning of Dirty Water
Dewatering Pulp Screening and Fractionation
Drying Solid Particles
Other Solid and Liquid Filtration
Retention of Fibre, etc
Learn more about wedge wire products contact us for a quote.