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Critical pressure control of delamination in impulse drying

Larsson, H and Stenström, Stig LU (1998) In Tappi Journal 81(7). p.117-122
Abstract
Different methods of preventing delamination in impulse drying are discussed, and a new method to avoid delamination is presented. The method is based on maintaining a low hydraulic pressure in the paper web. This gives a low temperature in the web, and the corresponding vapor pressure is not sufficient to delaminate the paper web. Experiments were made on a nip simulator to determine the critical pressure, the peak pressure above which delamination occurs. The critical pressure was determined as the pressure where the Scott bond value suddenly decreases. Experiments were made at 300 degrees C and a swell time of 40 ms for three basis weights: 54, 84, and 155 g/m(2). For the 54-g/m(2) basis weight, no delamination could be determined. For... (More)
Different methods of preventing delamination in impulse drying are discussed, and a new method to avoid delamination is presented. The method is based on maintaining a low hydraulic pressure in the paper web. This gives a low temperature in the web, and the corresponding vapor pressure is not sufficient to delaminate the paper web. Experiments were made on a nip simulator to determine the critical pressure, the peak pressure above which delamination occurs. The critical pressure was determined as the pressure where the Scott bond value suddenly decreases. Experiments were made at 300 degrees C and a swell time of 40 ms for three basis weights: 54, 84, and 155 g/m(2). For the 54-g/m(2) basis weight, no delamination could be determined. For the 84- and 155-g/m(2) basis weights, the critical pressure was determined as 1.6 and 1.4 MPa respectively. For the 54-g/m(2) basis weight, an increase of the peak pressure did not affect the moisture ratio change, but for the 84- and 155-g/m(2) basis weights, the moisture ratio change increased with increasing peak pressure. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
critical pressure, delamination, hydraulic pressure, moisture, control, nip, paper webs, shock drying, simulation, bonding
in
Tappi Journal
volume
81
issue
7
pages
117 - 122
publisher
TAPPI
external identifiers
  • wos:000074625100021
  • scopus:0032123774
ISSN
0734-1415
language
English
LU publication?
yes
id
3f810c33-7e43-4e99-babb-0c6ed522e4fd (old id 3914025)
date added to LUP
2013-07-01 12:25:04
date last changed
2017-01-01 07:27:37
@article{3f810c33-7e43-4e99-babb-0c6ed522e4fd,
  abstract     = {Different methods of preventing delamination in impulse drying are discussed, and a new method to avoid delamination is presented. The method is based on maintaining a low hydraulic pressure in the paper web. This gives a low temperature in the web, and the corresponding vapor pressure is not sufficient to delaminate the paper web. Experiments were made on a nip simulator to determine the critical pressure, the peak pressure above which delamination occurs. The critical pressure was determined as the pressure where the Scott bond value suddenly decreases. Experiments were made at 300 degrees C and a swell time of 40 ms for three basis weights: 54, 84, and 155 g/m(2). For the 54-g/m(2) basis weight, no delamination could be determined. For the 84- and 155-g/m(2) basis weights, the critical pressure was determined as 1.6 and 1.4 MPa respectively. For the 54-g/m(2) basis weight, an increase of the peak pressure did not affect the moisture ratio change, but for the 84- and 155-g/m(2) basis weights, the moisture ratio change increased with increasing peak pressure.},
  author       = {Larsson, H and Stenström, Stig},
  issn         = {0734-1415},
  keyword      = {critical pressure,delamination,hydraulic pressure,moisture,control,nip,paper webs,shock drying,simulation,bonding},
  language     = {eng},
  number       = {7},
  pages        = {117--122},
  publisher    = {TAPPI},
  series       = {Tappi Journal},
  title        = {Critical pressure control of delamination in impulse drying},
  volume       = {81},
  year         = {1998},
}