The recycling of waste paper has been long established as an environmentally friendly and especially cost-effective method in paper production. But the recycled waste paper, which is mixed with fibres and fillers, poses certain challenges to processing plants: To avoid wet waste paper being overly dehydrated during conveyance, meaning that the paper would no […]
Tag Archives: articles
21
Sep
Sep
Washington State University professor Tim Murray drove a white truck across a farm field where the winter wheat and rye look sick. Murray scooped a cup of dirt and used a pH meter to test it. The meter revealed what has become alarming to farmers: The soil was as acidic as a cup of black […]
12
Sep
Sep
New patented embossing roll gives higher converting speeds while reducing differences between sides and increasing roll firmness Similar to the extended nip pressing methods used on tissue and board machines, the MarryShoe rolls extends the pressing zone in tissue converting, giving longer dwell time in the nip with lower peak pressure. The benefits have […]
11
Sep
Sep
With today’s increasingly high energy and chemical costs and stringent environmental regulations, the need for improved recovery of chemicals from the pulp and paper making process has become a critical economic factor in the industry. It is essential that mills maximise steam and power production capacity, reduce recirculating chemical dead loads, and minimise chemical losses. […]
Articles
Tissue Sheet Softness – Theory, measurement, and chemical applications which can improve it
10
Sep
Sep
1. Softness vs. Strength Softness and strength are generally seen as the two most important consumer attributes in tissue and towel grades. Softness should be maximized to improve consumer perception of the product, whereas strength should be at a level to provide adequate functioning of the product during use. Unfortunately, there is a well-known inverse relationship between […]
08
Sep
Sep
1. Introduction There are a variety of ways to produce tissue and towel products from wood-based fiber furnishes. These may include the use of primary (or virgin) fiber produced with conventional chemical pulp processes, such as bleached hardwood and softwood kraft pulp, as well as recycled fibers (RCF) that are produced via the processing of […]
06
Sep
Sep
For tissue paper products, the process of creping is what gives the sheet the required lower density and increased caliper, as well as numerous other desirable properties. This article examines the basic mechanics of the conventional dry-crepe process, the technology which is used for the majority of the world’s tissue manufacture. By Ian Padley, Tissue Applications Manager, BTG […]
05
Sep
Sep
1. Background Dry-crepe tissue technology, which involves pressing of the sheet when it is in a wet state, is the most common method of tissue manufacture. This is often called the “conventional” process because of its widespread use throughout the world . But there is a second process, called “Through-Air Drying” (TAD), that has become […]
Articles
Tissue Drying Strategies – Factors to Consider to Achieve Yankee/Hood Balance for the Highest Energy Efficiency
04
Sep
Sep
Dewatering of the paper sheet on a conventional tissue machine is normally accomplished by using a combination of mechanical and thermal processes. Following formation of the sheet, the dry solids content is initially increased to around 40-45% by pressing and vacuum forces. This is followed by evaporation in the Yankee and hood to 93-95% dryness. […]
03
Sep
Sep
This section will mainly cover the Steel Yankee Dryer, which has been rapidly adopted by the industry over the past 15 years. This text also briefly covers some basic principles of sheet drying on a tissue machine. However, these principles will be covered in much more detail in a separate section entitled Drying: Yankee dryer & Air […]
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