Title:
【発明の名称】製紙機械のドライヤ
Document Type and Number:
Japanese Patent JP3271118
Kind Code:
B2
Abstract:
The dryer section in a papermaking machine has a single tier of all top felted dryer rolls six to nine feet in diameter. Air caps are employed over the dryer rolls to simultaneously dry both sides of the web to prevent curl and to increase drying rates. The air caps employ blown air at a temperature of 250-900 degrees Fahrenheit and air speeds of 8,000-40,000 feet per minute. The dryer fabric employed is foraminous with a permeability of between 300-1,200 cubic feet per minute per square foot and is designed to withstand peak temperatures of up to 900 degrees Fahrenheit and average temperatures of between 500-600 degrees Fahrenheit. A single transfer roll, or more advantageously, two grooved vacuum rolls in a vacuum box are disposed between the dryer rolls to maximize the circumferential wrap of the web and, at the same time, support and transport the web between dryer rolls.
Inventors:
Deshpande, Rajendra Dee
Purkoukie, Jeffrey H.
Purkoukie, Jeffrey H.
Application Number:
JP54236197A
Publication Date:
April 02, 2002
Filing Date:
April 03, 1997
Export Citation:
Assignee:
Beloit Technologies, Inc.
International Classes:
D21F5/04; (IPC1-7): D21F5/04
Domestic Patent References:
| JP7189163A | ||||
| JP7252793A | ||||
| JP3174084A |
Other References:
【文献】特許3225315(JP,B2)
【文献】米国特許5495679(US,A)
【文献】米国特許5495679(US,A)
Attorney, Agent or Firm:
Arata Ishikawa (1 person outside)