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Warewashing system containing nonionic surfactant that performs both a cleaning and sheeting function and a method of warewashing

a non-ionic surfactant and warewashing technology, applied in the field of warewashing detergent, can solve the problems of adding additional expense and complexity to the institution's warewashing machine, and not suitable for non-ionic materials

Inactive Publication Date: 2003-10-07
ECOLAB USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The discussion above relating to warewashing methods, and alkaline detergent compositions containing a rinse agent, relate to our current understanding of the technical aspects of the invention. The following compositional examples, testing and related data provide evidence of the effectiveness of the invention and include a best mode.

Problems solved by technology

Not all nonionic materials are appropriate for rinsing use.
The requirement for a separate rinse dispenser adds additional expense and complexity to institutional warewashing machines.

Method used

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  • Warewashing system containing nonionic surfactant that performs both a cleaning and sheeting function and a method of warewashing
  • Warewashing system containing nonionic surfactant that performs both a cleaning and sheeting function and a method of warewashing

Examples

Experimental program
Comparison scheme
Effect test

example 1

Into a stirred and heated mixing tank is added 50 grams of a PO-EO-PO block copolymer having an average of about 18 moles PO, 14 moles EO and 18 moles PO, and 50 grams of a benzyl ether of a C.sub.10-14 linear alcohol (12.4) mole ethoxylate. The tank agitator was energized and warmed to 195.degree. F. About 20 parts by weight of water were added and the surfactant mixture was warmed until the tank reached 195.degree. F. Into the stirred tank was added about 60 grams of a nonionic comprising a benzyl capped C.sub.10-14 linear alcohol 12 mole ethoxylate. Into the stirred surfactant blend was added 175 grams of sodium carbonate (anhydrous). The organic inorganic mixture was agitated until uniform and heated to a portable viscosity (approximately 142.degree. F. After uniformity was achieved, about 165 grams of sodium tripolyphosphate were added to the stirred blend. The viscosity was monitored and held between 6,000 and 20,000 cP at about 150.degree. F. The stirred blend was cast into 8...

example 2

In a second test sequence, a "typical" set of conditions were run in a low temperature dishmachine to compare a standard detergent and rinse aid (Ecolab Solid Ultra Klene Plus and Solid Ultra Dry) versus the test detergent / rinse aid combination formula.

In test 1, a standard detergent and rinse aid 1100 ppm of Slid Ultra Klene Plus and 6 grams of Solid Rinse Additive were run through a 10 cycle spot and film test. In test 2, 1160 ppm of the test detergent shown below run with no rinse additive and the results after 10 cycles were at least as good as those observed with test 1. Furthermore, a third test was run where Solid Ultra Klene Plus was run with the rinse additive reduced to 0.7 grams per rack. This test was stopped after 8 cycles, due to the glassware being severely spotted and filmed.

In conclusion, a "standard" detergent needs to be run with a rinse additive in order to get acceptable results, while the test detergent formula gave very good results without the addition of a s...

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Abstract

We have found an alkaline warewashing detergent composition that can contain a critical amount of a nonionic rinse agent that when used in automatic warewashing machines permits the use of a potable water rinse without the addition of a separate rinse agent. Sufficient residual nonionic surfactant from the alkaline detergent remains on the surface ware and internal machine and rack surfaces after washing to promote adequate sheeting in the rinse cycle. The residual nonionic surfactant on internal surfaces dissolves in the rinse water to create an effective aqueous rinse agent. The nonionic rinse agents can be a single nonionic for both foam reduction cleaning and sheeting or can be a blend of nonionic materials providing these functions. The detergent can be in the form of a particulate, pelletized or block solid. The detergent can be used in a variety of high temperature and low temperature automatic warewashing machines including large multizone conveyor machines, or relatively small institutional machines that have a single washing chamber.

Description

FIELD OF THE INVENTIONThe invention relates to an institutional or industrial warewashing detergent and to its use in automatic warewashing machines that operates with a wash and a rinse cycle. The detergent of the invention promotes soil removal and rinsing or rinse water sheeting in washing and rinsing stages, respectively. The detergent can include a cleansing source of alkalinity, a rinsing source of nonionic and can contain additional ingredients such as surfactants, rinse agents, builders, hardness sequestering agents, etc.BACKGROUND OF THE INVENTIONA variety of warewashing detergents have been in common use in wash water solution at high temperature (temperature sanitizing) or low temperature (chemical sanitizing) for many years in both institutional and household automatic warewashing machines. Such detergents have taken the form of a thickened liquid, particulate solid, a pellet, aqueous solution or dispersion or in the form of a solid block detergent. In institutional ware...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C11D1/72C11D11/00C11D1/825C11D3/02C11D3/10C11D1/00C11D1/722C11D3/37
CPCC11D1/008C11D1/72C11D1/722C11D1/825C11D3/044C11D3/10C11D3/3707C11D2111/14
Inventor ROLANDO, JOHN J.KLOS, TERRY J.
Owner ECOLAB USA INC
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