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Language: English Portuguese Russian
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Training Time: 13 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese, Russian
Some pulp mills are not integrated with papermaking operations, so they produce market pulp and sell it to papermaking facilities. Market pulp is dried and then cut into sheets that are stacked into bales so they can be transported. Most market pulp is dried to about 10% moisture, but pulp that will only travel a short distance might be dried to about 50% moisture. The higher moisture pulp is known as "wetlap." Pulp drying machines are similar to paper machines and typically include the following processes: forming, pressing, drying, cutting, and baling. This module describes each of these processes in detail.
Paper Coating Ingredients
View Course
Paper Machine Winder Safety
Paper Ream Packing
Roll Handling and Wrapping
Sheeting of Paper
The following key questions are answered in this module:
How is market pulp made?A thick pulp web is formed and pressed using equipment similar to a paper machine. Usually, the pulp sheet is dried in an airborne dryer. After the pulp is dried, it is cut in to sheets. The sheets are collected into bales which are compressed, wrapped, and strapped.
What is an airborne dryer?An airborne dryer is a large enclosed structure. The pulp web enters the top of the enclosure and makes several horizontal passes around unheated rolls. Fans force air through blow boxes and onto the pulp web. The air removes water and carries it away from the pulp web.
What are blow boxes?Blow boxes are air headers that direct air onto the pulp sheet. The pulp web travels between upper and lower blow boxes. The lower boxes blow air to help hold the sheet above the box.
How is the pulp web cut into sheets?The pulp web is cut lengthwise by slitters. Then a rotary cutter cuts the sheet width-wise.
How are the bales wrapped?Two larger sheets of pulp are folded around the stack of cut pulp sheets and secured with either wires or straps.
Below is a transcript of the video sample provided for this module:
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