Yankee dryers are used in paper manufacturing to dry tissue paper. They are separate from the main dryer, reducing its size and allowing better use of workspace. The dryer can cut and press paper, and uses less energy.
Yankee Drying Units are used in paper manufacturing, especially to dry thin sheet tissue paper, for both craft and bathroom use. Unlike many other units in the papermaking process, the Yankee dryer exists outside of the main dryer. There are some benefits to this, such as reducing the size of the main dryer and making better use of work space. Some, but not all, Yankee dryers are capable of cutting and pressing paper into sheets.
Tissue paper is a versatile, but very dry paper that needs to go through a special drying process to get rid of any excess moisture. When the pulp — which has usually been previously dried to some extent — enters a Yankee dryer, it still has about 50 percent of its moisture. After running through the dryer, about 10% moisture remains, leaving the paper quite crisp. The dryer normally has a conveyor unit which allows it to batch process the pulp.
With papermaking, all the units and parts required for the paper process are usually connected directly to the main drying unit. This includes the equipment to cut, dry, wrap, press and fully finish the paper. When a Yankee dryer is used, this dryer is a separate entity from the main dryer. This may be a disadvantage for some people, because the slightly dried pulp has to go from the main dryer to the Yankee model, but there are some advantages too.
One benefit of using a Yankee dryer is that it reduces the size of the main dryer by approximately 10 to 20 feet (3,048 to 6,096 meters), depending on the size of the Yankee unit. By decreasing the size, the main dryer does not take up as much space and the Yankee unit can be placed to the side of the main dryer, allowing workers to make better use of the workspace. The design of this dryer also allows paper to be dried with a lower overall energy expenditure.
Most Yankee dryers can only dry paper, but there are some that are capable of more than that. Those that can make more usually have a utility knife to cut the dry paper and there may be some glue to help pull the pulp together into sheets. A dryer with these attachments can do most paper-making steps on its own without the need for another unit, although a smaller dryer may be needed to remove the initial moisture.
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