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Language: English French Polish Portuguese Russian
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Paper Machine Dryers Series (Details)Includes 8 courses for $299/year. Paper Library (Details)Includes 95 courses for $1,499/year.
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Training Time: 17 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese, French, Polish, Russian
Surface sizing is commonly used on grades of paper and board that will be coated and/or printed. The traditional purposes of surface sizing have been to improve the sheet's resistance to the penetration of fluids and to improve certain sheet properties. Traditionally, a starch-based sizing solution is applied to both sides of a fully dried sheet in a two-roll nip at a "size press" that is located between drying sections. This course discusses the design and functions of a size press.
Dryer Felt Design
View Course
Dryer Felt System Operations
Paper Machine Dryer Hood Air Systems
Paper Machine Reel Systems
Wet Pressing Theory
The following key questions are answered in this module:
What is the purpose of surface sizing?The purpose is to improve the sheet's resistance to the penetration of fluids like ink, and improve certain sheet properties, such as surface strength, internal bond, stiffness, and porosity
Where is surface sizing usually applied to the sheet?Traditionally, surface sizing is applied at a "size press" that is located between drying sections, though it can also be applied at a calender stack
How is cationic starch different from regular starch?Cationic starch is starch that has been treated to produce cationically-charged starch that better adheres to the anionically-charged fibers in the sheet
Where is surface sizing usually applied to the sheet?It is the weight of surface size picked up by the sheet per unit area. You must know the sheet weight before and after the size press in order to calculate it.
Why do sheet breaks often occur at the size press?Because the sheet is re-wetted at the size press, there is an increased possibility of sheet breaks here, especially if there is a weak spot or hole in the sheet.
Below is a transcript of the video sample provided for this module:
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