open draws

18:14 Jan 11, 2018 

que incluyo en mi respuesta. Saludos cordiales.

18:12 Jan 11, 2018 

The wet paper web is picked up from the wire section and is transported by felts through the press section which contains one or more press nips to be passed. The so-called press nip is formed between two opposing rolls pressed together. The paper web today is usually transported either on one felt in the top or bottom position or between two felts as a sandwich. In some cases, when the paper web is strong enough compared with the applied stress in operation, the web is transported towards the next press nip or to the dryer section without any felt support. This is called an open draw. The water removed from the web is stored and carried away in the felt and, in the case of high water extraction, also in grooves or perforations in the surfaces of the rolls behind the felt. With suction press rolls, storage and transportation of water are improved and rewetting of the paper web is reduced