Claims
- 1. A method of supplying stock to a headbox for injection onto a wire, comprising the steps of:regulating by means of valves a flow of high consistency stock having a consistency of at least 1.5 percent and no more than 4.0 percent into a headbox; simultaneously and separately regulating by valves a flow of dilution water supplied by a dilution pump, into the headbox, so that dilution of the high consistency stock takes place within the headbox to form a diluted stock having a consistency between 0.4 and 1.2 percent; discharging the diluted stock on to the wire; and recovering water which drains from the wire as dilution water which is supplied to the dilution pump, wherein the high-consistency stock flows through a main line to a pump upstream of the headbox, and wherein a component flow is separated from the recovered dilation water, which component flow is added to the main line before the pump.
- 2. The method of claim 1 wherein the headbox is divided in the cross direction of the machine into a plurality of compartments, and wherein the high consistency stock and the dilution water are fed separately into each of the compartments, and wherein said high consistency stock and said dilution water are regulated so as to combine the operation of dilution profiling and the operation of dilution of the high consistency stock into one operation.
- 3. The method of claim 1 wherein the dilution water recovered from the wire is fed through deaeration equipment prior to flowing into the headbox.
- 4. A method of supplying stock to a headbox for injection onto a wire, comprising the steps of:regulating by means of valves a flow of high consistency stock having a consistency of at least 1.5 percent and no more than 4.0 percent into a headbox; simultaneously and separately regulating by valves a flow of dilution water supplied by a dilution pump, into the headbox, so that dilution of the high consistency stock takes place within the headbox to form a diluted stock having a consistency between 0.4 and 1.2 percent; discharging the diluted stock on to the wire; recovering water which drains from the wire as dilution water which is supplied to the dilution pump; and feeding the stock having a consistency of at least 1.5 percent and no more than 4 percent through a main line to a first pump before feeding into the headbox, and wherein a component flow is separated from the dilution water, which component flow is passed back to the main line before the first pump.
- 5. The method of claim 4 further comprising the step of feeding the dilution water through a deaeration equipment prior to being fed into the headbox.
Priority Claims (1)
Number |
Date |
Country |
Kind |
982822 |
Dec 1998 |
FI |
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CROSS REFERENCES TO RELATED APPLICATIONS
This application is a continuation of PCT Application No. PCT/FI99/01078, filed Dec. 23, 1999, and claims priority on Finnish Application No. 982822, filed Dec. 30, 1998, the disclosures of both of which applications are incorporated by reference herein.
US Referenced Citations (10)
Foreign Referenced Citations (4)
Number |
Date |
Country |
195 09 522 |
Sep 1996 |
DE |
197 36 047 |
Feb 1999 |
DE |
0 898 014 |
Feb 1999 |
EP |
88415 |
Jan 1993 |
FI |
Non-Patent Literature Citations (4)
Entry |
PCT International Preliminary Examination Report for PCT/FI99/01078. |
PCT International Preliminary Examination Report for PCT/FI99/01078, May 14, 2001. |
International Search Report issued in International Patent Application No. PCT/FI99/01078, May 4, 2000. |
National Board of Patents and Registration Official Action dated Nov. 08, 1999 in Patent Application No. 982822. |
Continuations (1)
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Number |
Date |
Country |
Parent |
PCT/FI99/01078 |
Dec 1999 |
US |
Child |
09/897528 |
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US |