Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1997-02-14
1998-09-22
Chin, Peter
Paper making and fiber liberation
Processes and products
Non-fiber additive
162111, 162112, 162142, 162163, 162176, D21H 1504, D21H 1724
Patent
active
058109722
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a method for the production of creped hygienic cellulose paper, and in particular of tissue paper, comprising a method for manufacturing creped hygienic cellulose paper, in particular tissue paper wherein the method comprises the steps of: producing a cellulose containing pulp; depositing a wet pulp web on a continuously rotating wire; draining the wet pulp web on the wire; primary draining of the wet pulp web by means of pressing rollers; transferring the wet web to a yankee drier; and scraping the dried paper web off the yankee drier while creping the web.
Accordingly, the invention proceeds from the conventional production methods for creped hygienic cellulose papers that have a grammage of 14 to 22 g/m as a rule.
BACKGROUND OF THE INVENTION
Conventionally, a cellulose containing pulp is made for the production of creped hygienic cellulose paper, which is deposited in the form of a wet pulp web on a continuously rotating wire, which usually is an endless wire of water-permeable fabric deflected via rolls and driven thereby. During the transport of the wet pulp web on the advanced wire, the wet web is preliminarily drained by part of the water contained therein flowing off through the wire. Then the main draining of the wet pulp web takes place by means of pressing rollers, after which the web has a solids content of 40 to 50%. The pressing rollers may for instance be arranged in the vicinity of the yankee drier or delivery felt mentioned below.
During or after the main draining, the wet web is for instance transferred by means of a so-called delivery felt to a rotating drying cylinder, which may be a so-called "yankee drier". The yankee drier is heated from inside by high pressure steam (for instance of 8 bar). Further, a drying hood, if necessary two-parted in the direction of rotation, is disposed over the width of the yankee drier and about half its circumferential length; hot air (of a temperature of 250.degree. C. to 450.degree. C.) is blown via the drying hood from outside on the wet web. As a result of the above measures, the wet pulp web dries while rotating about the yankee drier, adhering to the latter. The desired solids content of the paper web dried on the yankee drier is 94 to 96%.
Finally, the dried paper web adhering to the yankee drier is detached from the yankee drier by a scraper knife extending over the width of the cylinder and is simultaneously creped. The detached paper web is rolled on to reels--which operation may be accompanied by defined stretching, if required.
The method outlined above comprises the basic steps for the production of cellulose paper, however, within the frame of papermaking knowhow, individual steps may be modified or completed. The invention can be used in such modified processes too.
The invention proceeds from different problems posed by the production of creped hygienic cellulose papers: requirement of as high as possible a strength on the one hand, but also of the highest possible softness in view of the field of application of hygienic papers. Fundamentally, these two requirements are contradictory, because an especially strong paper will as a rule be comparatively hard and an especially soft paper will as a rule not be very strong. Proceeding from a certain kind of cellulose for the manufacture of paper, in particular measures taken to increase the strength, for instance by the addition of corresponding additives, will result in a decrease of the paper softness. For the manufacture of paper, therefore, a compromise must be found between the two mentioned requirements. running properties of the paper web--the so-called runnability. These are different properties, such as the uniform structure of the paper web, the degree and the uniformity of its adherence to the yankee drier, the possibility of scraping the paper web off the yankee drier etc. is, among other things, of decisive importance for the runnability of the paper web; as a principle, this layer develops from such constituents of the paper web as emer
REFERENCES:
patent: 3138473 (1964-06-01), Floyd et al.
patent: 4071651 (1978-01-01), Hicklin et al.
patent: 4758282 (1988-07-01), Stober et al.
patent: 4940513 (1990-07-01), Spendel
patent: 4940784 (1990-07-01), Stober et al.
patent: 5338406 (1994-08-01), Smith
patent: 5338407 (1994-08-01), Dasgupta
patent: 5415736 (1995-05-01), Grether
patent: 5554745 (1996-09-01), Chiu et al.
patent: 5690790 (1997-11-01), Headlam et al.
Smook, G.A., Handbook of Pulp & Paper Terminology, Angus Wilde Publications, pp. 137-138, 1990.
Smook, G.A. "Handbook for Pulp & Paper Technologists," 1982, pp. 5-7, pp. 202-207.
Oliver, J.F.; "Dry Creping of Tissue Paper, A Review of Basic Factors" Tappi, vol. 63, No. 12, Dec. 1980; p. 92.
Rehders Frank
Reinheimer Horst
Chin Peter
Glazer Julia A.
Huston Larry L.
Reed T. David
The Procter & Gamble & Company
LandOfFree
Method for the production of creped hygienic cellulose paper does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for the production of creped hygienic cellulose paper, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for the production of creped hygienic cellulose paper will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1619492