Paper making and fiber liberation – Processes and products – Conditioning – preparing or repairing of apparatus
Patent
1997-03-24
1998-09-01
Silverman, Stanley S.
Paper making and fiber liberation
Processes and products
Conditioning, preparing or repairing of apparatus
162179, 162158, 162DIG4, D21C 908
Patent
active
058006770
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of international application PCT/JP96/00874 filed Mar. 28, 1996.
TECHNICAL FIELD
This invention relates to a novel pitch-controlling agent which is used in the production of wood pulp and paper, and also to a method for preventing pitch trouble by using such a pitch-controlling agent.
BACKGROUND ART
In the paper pulp industry, pitch has troubled the operations starting from pulping, for many years. The pitch trouble has presented a much more complicated aspect in the recent background that involves the promotion of the closed system for the improvement in the recycle of white water as well as the shortage of wood resources. In particular, the raw materials in papermaking have become diversified, and used paper with much size and wood from the South Sea Islands that has a large resin content have become used in large proportions. In addition, paper products have also become diversified, resulting in the necessity of using large amount of various chemicals in papermaking.
The pitch as referred to herein indicates a generic term for resinous substances contained in pulp (GP, TMP, KP or DIP among others), as known in the papermaking industry. This is originally dispersed in pulp slurry (paperstock) but is coagulated due to the change in pH, temperature or ion strength to form a sticky substance, which causes various troubles in papermaking. For example, the pitch adheres to papermaking devices, then accumulates thereon and soils products or gives defective products with holes.
The pitch is mostly derived from three groups; the first comprises resin acids, fatty acids, alcohols and non-saponified substances derived from wood, as well as those as denatured during pulping; the second comprises mainly adhesives or ink vehicles derived from used paper pulp; and the third comprises chemicals as originally added in papermaking but not fixed on paper products, such as starch, synthetic paper enhancers or sizing agents.
In order to prevent or reduce the pitch trouble, various pitch-controlling agents have heretofore been proposed. For example, various organic and inorganic pitch-controlling agents have been proposed such as those described in Japanese Patent Publication No. 45-25322, Japanese Patent Laid-Open Nos. 55-84491, 55-80598, 63-264993, 3-244698, 4-352898, 4-202299, 4-300383, among others. However, none of these has produced a satisfactory effect in preventing pitch trouble.
Recently, in addition, slime trouble caused by microorganisms has increased along with the increase in the above-mentioned pitch trouble. The slime trouble is such that the slime adheres to papermaking devices thereby interfering with the smooth papermaking operation and soiling products. The combination of pitch trouble and slime trouble results in the synergistic effect of the two, thereby producing so-called deposit trouble.
The present inventor has intensively investigated in order to solve the above-mentioned pitch trouble in the paper pulp industry and, as a result, he has found that a pitch-controlling agent comprising zinc salts of higher fatty acids and cationic surfactants well prevents pitch trouble, while increasing the sizing degree in the resulting paper and also increasing the papermaking speed as well as the retentiveness of paper stock in papermaking. On the basis of these findings, the inventor has completed this invention.
Most paper products are sized in order to make them resistant to the penetration of liquid, such as ink or water, therethrough. The sizing degree indicates the degree of the sizing effect. Sizing enlarges the contact angle on paper and increases the hydrophobic degree of paper.
Specifically, the object of the present invention is to provide a novel pitch-controlling agent capable of well preventing pitch trouble and, in addition, producing other favorable characteristics such as the sizing effect, and also to provide a method for preventing pitch trouble by using such a pitch-controlling agent.
DISCLOSURE OF THE INVENTION
According to the present invention, there is pr
REFERENCES:
patent: 2133694 (1938-10-01), Greider
patent: 2563856 (1951-08-01), McGinn
patent: 2563857 (1951-08-01), McGinn
patent: 2715614 (1955-08-01), Snook
patent: 2767089 (1956-10-01), Renfrew
patent: 2944931 (1960-07-01), Yang
patent: 3920807 (1975-11-01), Curry et al.
patent: 4029863 (1977-06-01), Lemper
patent: 4253994 (1981-03-01), Zakaria et al.
Fortuna Jos'e A.
Nissin Kagaku Kenkyusho Co., Ltd.
Silverman Stanley S.
LandOfFree
Method for preventing pitch trouble 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 preventing pitch trouble, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for preventing pitch trouble will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-266312