Sen-iso Kogyo
Online ISSN : 1884-2283
ISSN-L : 0371-070X
Volume 6, Issue 4
Displaying 1-4 of 4 articles from this issue
  • STUDIES ON THE BEATING OF THE PULP. VIII.
    Michimaro Nakano
    1930 Volume 6 Issue 4 Pages 89-99,17
    Published: April 15, 1930
    Released on J-STAGE: November 12, 2009
    JOURNAL FREE ACCESS
    The author has studied the effects on stuffs of various reagents and of the preliminary treatments when beaten under definite conditions in the ball mill, and has obtained the following results :
    1. When treated preliminary with dilute solutions of strong acids under proper conditions the wet beating of certain pulps is rapidly attained due to a reduction of the aggregation degree of the cellulose. But the loss of minute fibres or the so-called slime from the wire cloth increases and, moreover, the strength of paper sheets from them is greatly reduced. Using dilute acid solutions as beating media, no difference is found in the beating degree comparing with the case of pure water.
    2. Weakly xanthated pulps give very wet stuffs by beating but the latters become very free when decomposed with an acid. The pulps once weakly xanthated and then decomposed with an acid are hard to be wet beaten.
    3. The addition of alcohol or glycerin to the water retards beating.
    4. The pulps treated preliminary with conc. zinc chloride solutions give very free stuffs the absorbent power of the sheets produced being very great.
    5. Beating in alkaline solutions results also free stuffs. The pulps treated preliminary with conc. alkaline solutions are hard to be wet beaten.
    6. Kraft pulps, when bleached, become soft and are easy to be wet beaten. The effects of breaching on sulphite pulps are not definite depending on the degree of bleaching.
    7. The addition of lactic acid to the water or the preliminary steeping of pulps in dilute lactic acid solutions does not accelerate beating which being against the claim in C.G. Schwalbe's D.R.P. 379996.
    8. Pulps for artificial silk show no special properties compared with ordinary paper pulps in their beating behaviours. Purified pulps for nitrocellulose are hard to be wet beaten.
    Download PDF (1722K)
  • Yoshiwo Kami, Mantarh Inubushi
    1930 Volume 6 Issue 4 Pages 99-106,19
    Published: April 15, 1930
    Released on J-STAGE: November 12, 2009
    JOURNAL FREE ACCESS
    Die Verfassern haben schon berichtet dasz die vollkommene Entschwefelung der Viskoseseide mit Natriumsulfid ganz unmöglich ist. (d.z.Bd. 5 Nr. 9 & 11). So werden hier den gleichen Versuche mit Ammoniaklösung wiederholt.
    5G. gewöhnliche Viskoseseide (zentrifugal, nicht nachbehandelt) getaucht im 70cc. Ammoniaklösung (von bestimmter Konzentration und vorher bei bestimmter Temperatur), und schlieszen den Apparat ganz zu. Nach der bestimmter Behandlungsdauer (bei konstant Temperatur) nehmen die Seide heraus, wasehen mit Wasser bis Ammoniak ganz frei ist, und dann trocknet bei unter 40°C. An dieser getrockneter Seide bestimmt man Zerreissfestigkeit, Dehnung und Schwefelgehalt (berechnet aus SO4Ba).
    Mit Ammoniak kann man die Seide zu sehr niedriger Schwefelgehalt als mit Na2S entschwefeln-d.h. unter 0, 01%. Es ist aber noch unmöglich die ganze Menge des Schwefel auszunehmen.
    Am besten behandelt man, für Praxis, die Seide I Stunde lang bei 70°C. mit 150 G.i.L. NH4OH Lösung, aber beim schnell Prozess 30 Minuten lang bei 50°C. mit 250 G.i.L. Lösung.
    Durch dieser Behandlung wird die Zerreissfestigkeit und Dehnung der Seide merkwürdig zunimmt und es hat die Neigung dasz die Vermehrung zu Behandlungsdauer im Proportion, aber zu Temperatur in die umgekehrte Proportion steht. In der Regel, wird die Seide weisser, glänzender und weicher durch dem Prozess. Es ist jedoch der nachteil diesel Verfahren dasz man im luftdichte Verschlusz behandeln muss.
    Download PDF (1078K)
  • STUDIES ON THE BEATING OF THE PULP. IX
    Michimaro Nakano
    1930 Volume 6 Issue 4 Pages 106-107,18
    Published: April 15, 1930
    Released on J-STAGE: November 12, 2009
    JOURNAL FREE ACCESS
    A surgical cotton was beaten in a laboratory beater for 7 hours to become a very wet stuff, the degree of wetness being Wm=113 on the author's wetness tester.2) After drying the beaten stuff its viscosity in a cuprammonium solution containing 182g NH3 and 11g Cu in L. was measured at 25°C by employing a celloviscometer3) devised by the author and the following result has been obtained :
    Thus a very considerable lowering of viscosity has been observed which seems to be mainly due to the reduction of the size of micellae in cellulose fibres.
    Download PDF (332K)
  • D Krüger
    1930 Volume 6 Issue 4 Pages 108-112
    Published: April 15, 1930
    Released on J-STAGE: November 12, 2009
    JOURNAL FREE ACCESS
    Download PDF (792K)
feedback
Top