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• Hotter, moister dryer section • Dryer arrangement complete with one layer of dry section • Alkaline papermaking • High running tension • Increased printing requirements for brown paper and recycled fiber papermaking • Every aspect of these areas Different dry blankets are required. But sometimes there are two factors superimposed. For example, many paper machines with all single-layer dryers are made from neutral paper, and many kraft papers made from recycled paper are processed into cartons, which are now printed in multi-color. pattern. All of this has led to the need for weaving carpet manufacturers to improve, improve, and thus change their products to better serve the paper industry.
In the past few decades, the raw materials of the dry blankets were mainly polyester monofilaments. However, if the steam pressure exceeds 5 bar, and the absolute humidity around the paper machine exceeds 3 kg water/kg air, the dry blanket will be degraded. The latest paper machine steam pressure is used to 10bar, the service life of the polyester blanket will certainly be affected - reduced to 60 days. The new dry blanket material has a significant increase in the durability of heat and hydrolytic properties, allowing the service life of the blanket to return to an acceptable level.
The single-deck dryer section brings the web from the press section to the reel. On these machines, only one high-speed dry blanket is required. However, because some of the drying is carried out by the dry blanket on the web to the vacuum device, this requires the dry blanket to be seamless. With regard to the requirements of these paper machines, the seaming technology of the dry blankets must be improved so that ultra-fine seamed dry blankets can be produced. For single-layer dryers, Bel-Plane and Aeroline blankets are the correct combination of blankets and seams.
Alkaline papermaking and higher running tensions have increased the challenge of drying blankets. Some paper machines have a structure that easily wears the carpet, and some CaCO3 fillers in the alkaline paper speed up the process. Higher operating tension can increase the heat transfer from the dryer to the paper and sometimes increase the dry release. However, a stronger, wear-resistant blanket is required. These conditions require more solid materials and reliable, structurally stable blankets to facilitate smooth operation.
In the past, the brown paper manufacturer had not encountered the requirement that the surface of the brown paper be the same as the surface of the white paper. As more and more cartons are used as advertising media, the surface standards of these papers are becoming the focus of attention. For example, at present, cartons are used on goods to enable them to directly sell large quantities of goods to consumers. Poorly printed packaging has a bad influence. This puts a higher requirement on the drying blanket and does not damage the brown paper produced, especially the paper copied out using waste paper. In demanding the best printing effect, producing brown paper is no longer a luxury requirement for a clean running dry blanket. Fine seams and stain-resistant drying quickly become the standard blanket for brown paper and white paper.
The proper drying blanket must be able to extend the service life of the blanket under any circumstances. It must also meet the requirements of paper quality. As the requirements of the dryer department's environment and paper quality are getting higher and higher, the carpet manufacturers must keep up. As the dryer section progressed, the dry blanket manufacturer's commitment to new raw materials and improved weaving structure was the leading position.
The basic function of the drying blanket is to promote the transfer of heat from the dryer to the paper, and to promote the transfer of water vapor from the paper to the system space. What has changed is the operating environment and paper production requirements of these dry blankets. The most important factors affecting the development of the dry blanket industry are: