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Language: English Portuguese
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Training Time: 21 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese
A twin-wire former captures the stock jet in the converging nip formed between two fabric-covered rolls. These are also sometimes referred to as "gap" formers. There are four types of twin-wire formers - blade, roll, hybrid and roll/blade. Each has its own challenges and strengths. With twin-wire formers, it is especially important to define the desired sheet properties, and then work with equipment and fabric suppliers to configure, control and operate the design that is selected.
At the end of this module, you will be able to:
The following key questions are answered in this module:
What are some benefits of twin-wire formers over Fourdrinier formers?Twin-wire formers reduce sheet two-sidedness, wire instability, and the length of the forming section. Also, twin-wire formers double the drainage area and can run at higher speeds.
What are some potential problems presented by twin-wire formers?Space limitations restrict the addition of more water-removal devices. Fibers can build up preferentially on the two fabric surfaces, which increases the likelihood of sheet delamination. Fabric selection is critical and there is a high potential for fabric and equipment damage because the fabrics operate in close proximity.
What is a roll former?Roll formers are characterized by the stock jet being captured in a long nip created between two fabrics traveling together around a perforated suction forming roll.
What is a blade former?Blade formers are characterized by a stock jet impinging into a gap between two forming fabrics which are fored together by a number of fixed blades in a vertical forming section.
What is a roll/blade former?Roll/blade formers try to combine the advantages of roll and blade formers and avoid their problems. Two forming fabrics wrap around a perforated suction roll then there is a blade section to provide additional pulsed drainage.
Below is a transcript of the video sample provided for this module:
Forming Fabric Design
View Course
Forming Fabric Tensioning and Guiding
Fourdrinier Design and Operation
Multi-ply Forming
Sheet Formation
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