Beijing PFM Screen Co., Ltd

The forming fabric of Paper Machine Clothing (PMC) plays a critical role in dewatering and forming the pulp, supporting the sheet as it is formed, and transporting it to the next press section during the paper-making process. It consists of one or two endless fabric loops. The primary functions of the forming fabric are to allow water removed from the paper to flow through the fabric; to support, hold and form the sheet; and to transport the paper from the headbox to the press section. The top surface of the   forming fabric acts as a filter cloth , forming a base for the fibers to be deposited to form a fiber mat. The geometry of the forming fabric surface contributes to sheet performance, including line marks, linting and sheet smoothness. Better support improves the quality of the fiber mat and the retention of fines, fillers and fibers on the support surface of the mat.   Functions The bottom surface of the formed web contributes to the characteristics of the conveyor...

First, the tension of both fabrics must be equal across the width of the machine. Therefore, measure the tension on both the soft side and the drive side. Make sure that the guide lines are as straight as possible. Next, if possible, increase the tension of the forming fabric a little. After that, you can also play with the tension of the jacquard felt. A little slack or a little tighter may be fine. Push the pick-up roll a little deeper into the forming fabric. This increases the load on the still fragile sheets, so be careful with this option. Look at the pickup point from the back of the fabric (machine) with a bright light to see if the pickup roll is being pushed evenly into the fabric over the entire width of the machine. If not, you may have some alignment work to do. Press Felts Check for unexpected speed differences. Some mills run their press felts slightly faster, and some have the same speed setting for both fabrics. In fact, speed differences are very subtle in the jacquar...

The   Press Felts   play an important role in the paper web after the forming section, giving it smoothness while transporting it to the drying section. Depending on their position on the paper machine, they can be classified as wet felts, top felts and dryer felts. In addition to removing the most moisture from all press felts, the pick-up felts must pick up delicate sheets from the forming fabric and guide them into the press section. Problems in the pick-up area often result in breakage of the press section. How can you prevent breaks in the press section of your paper machine? As a Press Felts manufacture, I will share with you. Press Felts Increase the moisture content of the felt before the pick-up point. Water will smooth the paper side of the blanket and improve the tackiness of the blanket. The additional water will increase the water pressure in the first press section. This can lead to better dewatering, but if taken to the extreme, it can also lead to pressing...

  The Full Circle Translucent on the Felt When this happens, check whether there is impurities in the pastern axes or whether there is a hard spot on the felt guide roller.   Felt Fluff on the Felt Vertical fluffing generally caused by the unclean felt roller surface or rough vacuum suction box panel, may be local fluff or the whole fluff; Transverse fluff may be caused by the desynchrony of felt and press roll in press section.   The Break of the Felt warp and weft The break of the felt warp and weft is usually caused by the damage of hard objects. Sometimes the pulp bolts may made holes on the felt. Also, the fine hard objects such as sand, broken glass in the pulp will make the felt strength decline, the felt warp and weft break. Flakes or punctate appeared in felt, warp and weft broken, may be caused by chemical corrosion, which is low fiber strength. The break of edge warp mostly due to friction with the rack because that the felt is too wide.   Beijing PFM Scre...

As a   press felts supplier , I'd like to introduce it to you.   What is a Paper Making Machine Felt? Paper Machine Clothing Single Layer BOM Press Felts Paper machine felt is a material used in the paper industry. It is mainly used for paper sheet forming, wet paper sheet dewatering and paper sheet transportation. Paper machine felts have good dewatering, smoothness, abrasion resistance, stability and other characteristics. Generally, the paper making felt can be divide three types: wet felt, upper felt and dry felt according to the uses.   The Advantages of Paper Making Machine Felt 1. High anti-compaction capacity. 2. Long-term abrasion resistance and plasticity of of felt. 3. Extremely high elasticity and recoverability. 4. The felt is smooth and the pressure is evenly distributed. 5. Strong drainage capacity and larger void volume.

  Single Layer Forming Fabric 5. Guide roller winding pulp: the cleaning water pressure is low and there are many fibers inside the net; the net air permeability is low; there is a problem with the cleaning method. The two and a half layers of the net should be cleaned on the paper outlet surface of the net. Whether the nozzle is clogged, the best distance between the nozzle and the net surface is 15 -20cm.  6. Vacuum box top slurry: improper mesh air permeability, short slurry fiber loss, poor quality of retention aid or small addition amount. 7. Large fluctuation range when the net is running: the corrector is not working properly, and the side cutting of the net is not straight. 8. The net becomes narrow after using for a period of time: local wear of the forming plate, wiper board, vacuum box panel or guide roller causes the marking line of the net to run for a period of time to become slanted. 9. Comparison of the life of the D-type device and the previous net: The additi...

As a   Paper Machine Clothing Manufacturer , share with you. Single Layer Forming Fabric 1. Too fast abrasion of the screen edge: The most serious wear of most paper machines are at the joints with and without vacuum (10-15cm of the screen edge); Solution: 1. Increase the opening of the vacuum box as much as possible. Staggered width. 2. Add normal pressure lubricating water to the edge of the vacuum box. 3. Add stiffeners in appropriate positions. 4. Check whether there are edges or gaps in the side wiper and the vacuum box. Especially the joints of the ceramic panels are weak links 5. Check whether the edges of each roll are severely worn (the diameter becomes smaller after wear, so that the tension of the mesh is smaller than the normal mesh surface and further accelerates the wear) 2. The overall wear is too fast: 1. The panel quality is not good enough. 2. The net tension is too small, the return tension of the single-layer net is 3-4kg/cm, and the return tension of the two-la...