AT220933B - Process for increasing the stretchability of paper - Google Patents

Process for increasing the stretchability of paper

Info

Publication number
AT220933B
AT220933B AT274459A AT274459A AT220933B AT 220933 B AT220933 B AT 220933B AT 274459 A AT274459 A AT 274459A AT 274459 A AT274459 A AT 274459A AT 220933 B AT220933 B AT 220933B
Authority
AT
Austria
Prior art keywords
sep
paper
stretchability
increasing
paper web
Prior art date
Application number
AT274459A
Other languages
German (de)
Inventor
Olavi Erland Helasti Eng
Original Assignee
Lohja Kotka O Y
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 Lohja Kotka O Y filed Critical Lohja Kotka O Y
Application granted granted Critical
Publication of AT220933B publication Critical patent/AT220933B/en

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  • Paper (AREA)

Description

  

   <Desc/Clms Page number 1> 
 



  Verfahren zur Erhöhung der Dehnbarkeit von Papier 
 EMI1.1 
 

 <Desc/Clms Page number 2> 

 insbesonderetersten Stellung der Einwirkung von Pressluft ausgesetzt werden. Nachdem die Papierbahn mit den darin ausgebildeten Taschen durch die Glättrollen geführt worden ist, sind in dem fertigen Papier die darin ausgebildeten Taschen kaum erkennbar. 



   Wie bereits erwähnt, ist der hohe Grad der Dehnbarkeit der Papierbahn auf die darin ausgebildeten Taschen zurückzuführen. Die Gründe hiefür sind folgende :
1. Die gedehnten Teile der Papierbahn können sich frei zusammenziehen, weil die flachen Teile der Bahn die einer Zusammenziehung entgegenwirkende Spannung aufnehmen, wenn sich die Bahn auf der Papierhersrellungsmaschine befindet. 



   2. Die flachen Teile der Papierbahn bilden eine netzförmige ebene Zeichnung. 



   3. In   derPapierbahnbildensichverschiedeneBeanspruchungsbedingungenund demzufolge   reissen nicht alle Faserverbindungen (bzw. Verbindungen zwischen den Fasern) zur gleichen Zeit. 



   Das Mass der dem Papier mitgeteilten Dehnbarkeit kann entweder durch Steuerung des Saugens oder des Druckes oder durch Veränderung der Gestalt, Grösse und Anordnung der Saug- oder Druckzeichnungen beeinflusst werden. 



   Die nachstehenden Prüfungsdaten lassen die Verbesserung der Dehnbarkeit erkennen : 
 EMI2.1 
 
<tb> 
<tb> Dehnungsprozent
<tb> seitlich <SEP> der <SEP> Länge <SEP> nach <SEP> Mittelwert <SEP> Reisslänge <SEP> in <SEP> Metern
<tb> unbehandeltes
<tb> Papier <SEP> 6,0 <SEP> 2, <SEP> 5 <SEP> 4,2 <SEP> 10. <SEP> 000 <SEP> 
<tb> erfindungsgemäss
<tb> behandeltes <SEP> Papier <SEP> 8,5 <SEP> 4,0 <SEP> 6, <SEP> 2 <SEP> 9. <SEP> 000
<tb> 
 
 EMI2.2 




   <Desc / Clms Page number 1>
 



  Process for increasing the stretchability of paper
 EMI1.1
 

 <Desc / Clms Page number 2>

 in particular the most position to be exposed to the action of compressed air. After the paper web with the pockets formed in it has been guided through the smoothing rollers, the pockets formed in it can hardly be seen in the finished paper.



   As already mentioned, the high degree of extensibility of the paper web is due to the pockets formed in it. The reasons for this are as follows:
1. The stretched portions of the paper web are free to contract because the flat portions of the web take up the opposing tension when the web is on the paper making machine.



   2. The flat parts of the paper web form a reticulated planar drawing.



   3. Different stress conditions develop in the paper web and consequently not all fiber connections (or connections between fibers) break at the same time.



   The degree of extensibility reported to the paper can be influenced either by controlling the suction or the pressure or by changing the shape, size and arrangement of the suction or pressure drawings.



   The following test data show the improvement in elasticity:
 EMI2.1
 
<tb>
<tb> elongation percentage
<tb> to the side <SEP> of the <SEP> length <SEP> to <SEP> mean value <SEP> tear length <SEP> in <SEP> meters
<tb> untreated
<tb> Paper <SEP> 6.0 <SEP> 2, <SEP> 5 <SEP> 4.2 <SEP> 10. <SEP> 000 <SEP>
<tb> according to the invention
<tb> treated <SEP> paper <SEP> 8.5 <SEP> 4.0 <SEP> 6, <SEP> 2 <SEP> 9. <SEP> 000
<tb>
 
 EMI2.2

Claims (1)

<Desc/Clms Page number 3> bedeutend vergrössert3. Verfahren nach Anspruch l, dadurch gekennzeichnet, dass die taschenartigen Vertiefungen dadurch gebildet werden, dass die Papierbahn ohne Zwischenschaltung eines Drahtgitters oder Filzes direkt über den Saugabschnitt von Saugrollen geführt wird. <Desc / Clms Page number 3> significantly enlarged 3. Method according to claim 1, characterized in that the pocket-like depressions are formed in that the paper web is guided directly over the suction section of suction rollers without the interposition of a wire mesh or felt.
AT274459A 1958-04-16 1959-04-10 Process for increasing the stretchability of paper AT220933B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI220933X 1958-04-16

Publications (1)

Publication Number Publication Date
AT220933B true AT220933B (en) 1962-04-25

Family

ID=8556002

Family Applications (1)

Application Number Title Priority Date Filing Date
AT274459A AT220933B (en) 1958-04-16 1959-04-10 Process for increasing the stretchability of paper

Country Status (1)

Country Link
AT (1) AT220933B (en)

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