GB2119418A - Dry paper machine - Google Patents

Dry paper machine Download PDF

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Publication number
GB2119418A
GB2119418A GB08311057A GB8311057A GB2119418A GB 2119418 A GB2119418 A GB 2119418A GB 08311057 A GB08311057 A GB 08311057A GB 8311057 A GB8311057 A GB 8311057A GB 2119418 A GB2119418 A GB 2119418A
Authority
GB
United Kingdom
Prior art keywords
web
drying
underside
aid
bonding agent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB08311057A
Other versions
GB2119418B (en
GB8311057D0 (en
Inventor
Kalevi Riihinen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yhtyneet Paperitehtaat Oy
Original Assignee
Yhtyneet Paperitehtaat Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yhtyneet Paperitehtaat Oy filed Critical Yhtyneet Paperitehtaat Oy
Publication of GB8311057D0 publication Critical patent/GB8311057D0/en
Publication of GB2119418A publication Critical patent/GB2119418A/en
Application granted granted Critical
Publication of GB2119418B publication Critical patent/GB2119418B/en
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H5/00—Special paper or cardboard not otherwise provided for
    • D21H5/26—Special paper or cardboard manufactured by dry method; Apparatus or processes for forming webs by dry method from mainly short-fibre or particle material, e.g. paper pulp
    • D21H5/265—Treatment of the formed web
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00

Landscapes

  • Paper (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Luminescent Compositions (AREA)

Abstract

In a dry paper machine, in the step following the forming section, the fiber web has been conducted with the aid of topside and/or underside wires through the machine to the purpose of adding, drying and polymerizing the bonding agent. The unbonded fiber web has low strength and requires careful handling so that it might not break and cause process shut-downs. This circumstance has in modern paper machines resulted in a running speed which is low compared with the theoretical capacity of the machines. It has been found that web breaks tend to occur at the so-called open draws of its carry-through path, where the fiber web is not supported and is allowed to hang free in the air or carried by a wire (2, 3, 9). The object of the invention is to avoid open draws and to convey the web (1) in supported fashion through the entire process. The reliability of the procedure is improved by placing the mechanically drying calendering to be the last treatment step before polymerizing.

Description

SPECIFICATION Dry paper machine The present invention concerns a dry paper machine wherein in the step after the forming section the fibre web has been conducted with the aid of topside and/or underside wires through the machine to the purpose of adding, drying and polymerizing the bonding agent.
When the uncured web is being handled and transported, care must be exercised because of its low strength. This is particularly important in paper machines, where shut-downs are costly. In modern dry paper machines, the path of the web has so-called open draws where the web is not supported at all. At these points tensions build up in the web, and it breaks unless the web is run at low speed. As a consequence, present-day dry paper machines have poor efficiency because one has been forced to strike a compromise between the breaking tendency of the web and the throughput rate of the machine.
The object of the present invention is to eliminate the drawbacks mentioned above. In order to achieve this effect, the invention is characterized in that the topside and underside wires are disposed to overlap so that the web runs in a state of rest and without open draws causing tensions, through the entire process.
The invention is further characterized in that the fully bonded web is subjected to hot calendering after the drying process.
Moreover, the invention is characterized in that the partly bonded web is subjected to hot calendering after the drying process. By this arrangement the advantage is gained that the absorption of the bonding agent in the second step takes place efficiently, owing to the pressing preceding the spraying.
The invention is described in the following with the aid of an example with reference made to the attached drawing, wherein Fig. 1 presents a paper machine according to the invention; and Fig. 2 presents another embodiment of the invention.
In the paper machine of Fig. 1, the web 1 is transferred from the forming wire 2 to the underside of the first drying wire 3 with the aid of the suction box 4. The bonding agent 5 is thereafter sprayed on the web from below. It is possible, instead of bonding agent spraying, also to use compounds added at the web-forming step (hot-bonding resins or equivalent). The web is further carried, supported by a topside vacuum (suction box 7) through the first drying section 8.
The web is picked up into the embossing calender 14 with the aid of a smooth roll, possibly making use of water or steam, from the underside of the drying wire 3 and carried through the embossing calender nip.
The web is therefore transferred from the embossing calender 14 to the next wire 9 with the aid of the suction box 1 0. Finally, the web is carried in support of the wire 9 through the second bonding agent spraying 12, the drying section 8 and the polymerizing section 13.
In the arrangement depicted in Fig. 2, calendering is not carried out until after polymerizing, when the web is strong and durable.
It is obvious to a person skilled in the art that the invention is not confined to the example presented above and may instead be applied within the scope of the claims following below.
1. Dry paper machine wherein in the step after the forming section the fibre web has been conducted with the aid of topside and underside wires through the machine for adding, drying and polymerizing the bonding agent, characterized in that the topside and underside wires (3, 9) are disposed to overlap so that the web (1) runs in a state of rest without open draws causing tensions, through the entire process.
2. Procedure according to claim 1, characterized in that the fully bonded web (1) is subjected to hot calendering after the drying process.
3. Procedure according to claim 1, characterized in that the partly bonded web is subjected to hot calendering after the drying process.
4. Dry paper machine substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (4)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Dry paper machine The present invention concerns a dry paper machine wherein in the step after the forming section the fibre web has been conducted with the aid of topside and/or underside wires through the machine to the purpose of adding, drying and polymerizing the bonding agent. When the uncured web is being handled and transported, care must be exercised because of its low strength. This is particularly important in paper machines, where shut-downs are costly. In modern dry paper machines, the path of the web has so-called open draws where the web is not supported at all. At these points tensions build up in the web, and it breaks unless the web is run at low speed. As a consequence, present-day dry paper machines have poor efficiency because one has been forced to strike a compromise between the breaking tendency of the web and the throughput rate of the machine. The object of the present invention is to eliminate the drawbacks mentioned above. In order to achieve this effect, the invention is characterized in that the topside and underside wires are disposed to overlap so that the web runs in a state of rest and without open draws causing tensions, through the entire process. The invention is further characterized in that the fully bonded web is subjected to hot calendering after the drying process. Moreover, the invention is characterized in that the partly bonded web is subjected to hot calendering after the drying process. By this arrangement the advantage is gained that the absorption of the bonding agent in the second step takes place efficiently, owing to the pressing preceding the spraying. The invention is described in the following with the aid of an example with reference made to the attached drawing, wherein Fig. 1 presents a paper machine according to the invention; and Fig. 2 presents another embodiment of the invention. In the paper machine of Fig. 1, the web 1 is transferred from the forming wire 2 to the underside of the first drying wire 3 with the aid of the suction box 4. The bonding agent 5 is thereafter sprayed on the web from below. It is possible, instead of bonding agent spraying, also to use compounds added at the web-forming step (hot-bonding resins or equivalent). The web is further carried, supported by a topside vacuum (suction box 7) through the first drying section 8. The web is picked up into the embossing calender 14 with the aid of a smooth roll, possibly making use of water or steam, from the underside of the drying wire 3 and carried through the embossing calender nip. The web is therefore transferred from the embossing calender 14 to the next wire 9 with the aid of the suction box 1 0. Finally, the web is carried in support of the wire 9 through the second bonding agent spraying 12, the drying section 8 and the polymerizing section 13. In the arrangement depicted in Fig. 2, calendering is not carried out until after polymerizing, when the web is strong and durable. It is obvious to a person skilled in the art that the invention is not confined to the example presented above and may instead be applied within the scope of the claims following below. CLAIMS
1. Dry paper machine wherein in the step after the forming section the fibre web has been conducted with the aid of topside and underside wires through the machine for adding, drying and polymerizing the bonding agent, characterized in that the topside and underside wires (3, 9) are disposed to overlap so that the web (1) runs in a state of rest without open draws causing tensions, through the entire process.
2. Procedure according to claim 1, characterized in that the fully bonded web (1) is subjected to hot calendering after the drying process.
3. Procedure according to claim 1, characterized in that the partly bonded web is subjected to hot calendering after the drying process.
4. Dry paper machine substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
GB08311057A 1982-04-23 1983-04-22 Dry paper machine Expired GB2119418B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI821413A FI68284B (en) 1982-04-23 1982-04-23 TORRPAPPERSMASKIN

Publications (3)

Publication Number Publication Date
GB8311057D0 GB8311057D0 (en) 1983-05-25
GB2119418A true GB2119418A (en) 1983-11-16
GB2119418B GB2119418B (en) 1985-10-02

Family

ID=8515405

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08311057A Expired GB2119418B (en) 1982-04-23 1983-04-22 Dry paper machine

Country Status (6)

Country Link
AU (1) AU557619B2 (en)
DE (1) DE3342787T1 (en)
FI (1) FI68284B (en)
GB (1) GB2119418B (en)
SE (1) SE460127B (en)
WO (1) WO1983003858A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985003962A1 (en) * 1984-02-28 1985-09-12 Scan-Web I/S V. H. Kongsted Og J. Mosgaard Christe A method and an apparatus for embossing a dry laid fibre web, e.g. for kitchen roll paper

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4476078A (en) * 1982-05-04 1984-10-09 James River-Dixie/Northern, Inc. Process for manufacturing embossed nonwoven fibrous products

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1060113A (en) * 1963-05-22 1967-02-22 Kimberly Clark Co Papermaking machine
GB1113792A (en) * 1964-04-17 1968-05-15 Bunzl & Biach Ag A process for the production of composite material
GB1249053A (en) * 1968-02-28 1971-10-06 Vepa Ag Process and device for the production of continuous random webs
GB1445295A (en) * 1973-04-30 1976-08-11 Scott Paper Co Fibrous sheet material and method for producing such material
GB1522465A (en) * 1976-02-20 1978-08-23 Cyrenne R Paper machine draw roll
GB1549489A (en) * 1976-07-05 1979-08-08 Valmet Oy Method of and means for supporting a paper web passing to and through a paper-making-machine drying initial section
GB1564484A (en) * 1976-11-30 1980-04-10 Valmet Oy Method of and means for conveying and treating a web at the wet end of a paper-making machine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3030245A (en) * 1959-03-23 1962-04-17 Kimberly Clark Co Apparatus and method for the manufacture of cellulosic products
DE1653299B1 (en) * 1967-03-14 1971-03-04 Siempelkamp Gmbh & Co Transfer device for the transport of good mats for the production of chipboard, fiberboard or the like.
US3577290A (en) * 1968-08-19 1971-05-04 Procter & Gamble Process of making a nonwoven fabric
US3616035A (en) * 1968-12-26 1971-10-26 Procter & Gamble Method of continuously making a uniform nonwoven fabric

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1060113A (en) * 1963-05-22 1967-02-22 Kimberly Clark Co Papermaking machine
GB1113792A (en) * 1964-04-17 1968-05-15 Bunzl & Biach Ag A process for the production of composite material
GB1249053A (en) * 1968-02-28 1971-10-06 Vepa Ag Process and device for the production of continuous random webs
GB1445295A (en) * 1973-04-30 1976-08-11 Scott Paper Co Fibrous sheet material and method for producing such material
GB1522465A (en) * 1976-02-20 1978-08-23 Cyrenne R Paper machine draw roll
GB1549489A (en) * 1976-07-05 1979-08-08 Valmet Oy Method of and means for supporting a paper web passing to and through a paper-making-machine drying initial section
GB1564484A (en) * 1976-11-30 1980-04-10 Valmet Oy Method of and means for conveying and treating a web at the wet end of a paper-making machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985003962A1 (en) * 1984-02-28 1985-09-12 Scan-Web I/S V. H. Kongsted Og J. Mosgaard Christe A method and an apparatus for embossing a dry laid fibre web, e.g. for kitchen roll paper

Also Published As

Publication number Publication date
FI68284B (en) 1985-04-30
DE3342787T1 (en) 1985-02-21
SE460127B (en) 1989-09-11
WO1983003858A1 (en) 1983-11-10
GB2119418B (en) 1985-10-02
FI821413A0 (en) 1982-04-23
AU1512583A (en) 1983-11-21
AU557619B2 (en) 1986-12-24
FI821413L (en) 1983-10-24
SE8302277L (en) 1983-10-24
GB8311057D0 (en) 1983-05-25
SE8302277D0 (en) 1983-04-22

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PCNP Patent ceased through non-payment of renewal fee