Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Heterogeneous arrangement
Patent
1996-09-27
1998-08-18
Lieberman, Paul
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Heterogeneous arrangement
264117, 264140, C11D 1100
Patent
active
057958564
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for producing detergent particles having a high bulk density subjected to a treatment of increasing a bulk density.
BACKGROUND ART
The mainstream of the presently used cloth detergents is different from conventional granulated detergent particles having hollow shapes in that the granulated materials have a low void fraction in the inner portion of the granulated detergent particles by processing the powder, the detergent particles having a bulk density of from about 700 to 800 g/liter. It is desirable to further subjected to a treatment of increasing a bulk density of the granulated detergent particles for the purposes of efficiency of distribution owing to well-saved resources of the containers and well-saved spaces, and thereby making it simpler for the consumers' use.
In the production of cloth detergents, drum mixers are normally used to mix granulated detergent materials after the granulation with additives and recycled powders, which may result in a slight increase in the bulk density. However, since drum mixers and continuous drum mixers are used for the purpose of gently mixing particles in the mixers without causing breakage of the particles, the operating conditions of the mixers are accordingly set to achieve a low rotational speed expressed as a Froude number of approximately from 0.01 to 0.1 and a treatment time (mean residence time in the case of continuous drum mixers) as short as from about 3 to 10 minutes. These drum mixers are used for the purpose of mixing and not for the treatment of increasing bulk density, so that actual increase in bulk density cannot be substantially observed under normal mixing conditions.
Various techniques proposed for treatment of increasing the bulk density of granulated detergent particles are disclosed. Examples are given below by way of explanation.
Examples of methods of treatment of increasing bulk density of granulated detergents in the granulation process include the following.
Japanese Patent Laid-Open No. 61-69897 discloses a method for producing a granular detergent having a high density and excellent flowability, comprising the step of agitating and granulating a spray-dried product of detergents containing a surfactant and a builder in the presence of a surface modifying agent and a binder using a mixer having a vertical agitator shaft in an inner portion of a vertical mixing vessel.
Japanese Patent Laid-Open No. 61-69900 discloses a method for producing a granulated detergent having a high density and improved flowability, comprising the steps of pulverizing a spray-dried product of detergents containing a surfactant and a builder, and then carrying out granulation treatment of the pulverized product in the presence of a surface modifying agent with a mixer having a horizontal agitator shaft in an inner portion of a horizontal mixing vessel. Japanese Patent Laid-Open No. 2-232299 discloses a method for increasing the density of detergent particles as well as for improving the dispersibility and solubility, comprising the steps of continuously supplying granulated detergent particles to a granulating chamber having an agitation impeller rotating in a horizontal direction; granulating the supplied detergent particles by agitation and mixing; and making the granulated detergent particles overflow from a discharging outlet arranged at a side wall of the granulating chamber, and an apparatus used therefor.
Japanese Patent Laid-Open No. 1-247498 discloses a method for increasing the density of spray-dried detergent particles comprising the steps of continuously supplying spray-dried particles to a particular cylindrical mixing drum having a rotational shaft in an inner portion thereof, and adjusting a rotational speed of the shaft so as to have a mean residence time of from 10 to 60 seconds and a Froude number of from 50 to 1200. Japanese Patent Laid-Open No. 2-286799 discloses a continuous production method, comprising the steps of treating a granulated detergent composition or components the
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Hatano Koichi
Sakaue Masaaki
Toyoda Koji
Yamada Yasuji
Yamashita Hiroyuki
Douyon Lorna M.
Kao Corporation
Lieberman Paul
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