Coating processes – Removable protective coating applied
Patent
1997-02-13
1998-12-22
Dudash, Diana
Coating processes
Removable protective coating applied
427156, 427299, 427353, 510218, B05D 300
Patent
active
058515844
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method for applying a protective layer to which microorganisms do not adhere, to vessels and utensils used in the food industry, such as the milk and meat industries.
As is well-known, many types of disinfectants or cleaners possessing bactericidal properties are used in the food industry. With these agents the vessels and utensils, such as cutting and mixing equipment, collecting vessels, etc., are treated in, e.g., slaughterhouses, milk plants, dairying, bakeries, and food plants of a different kind. For instance, it is known from Kirk-Othmer, Encyclopedia of Chemical Technology, 3rd edition, vol. 15, page 542, to disinfect milk equipment with a chlorine.containing solution before use. Furthermore, it is stated on page 544 of the above literature reference that alkali or chlorinated acid cleaners can be used in a "cleaning-in-place" system suitable for milk handling equipment.
It has turned out, however, that the methods known from the state of the art, in which a disinfecting liquid is used, have the drawback that after carrying out the treatment a used disinfecting liquid is obtained which normally cannot be discharged without posttreatment.
It has been found that the surface of the vessels or utensils can be kept free from microorganisms by contacting the vessels or utensils with an aqueous soap solution and then rinsing it with water.
In fact, it has turned out that the protective soap layer applied as described above possesses water-repellent properties and is reliable from a hygienic point of view so that the use of disinfectants, as has taken place until now, has become superfluous. In particular, the protective layer prevents microorganisms from adhering to the protective surface and/or growing thereon.
Besides, it is known from Australian patent application 22740/77 that monoesters of a C.sub.12 -aliphatic fatty acid and polyols possess microbicidal activity. The minimally required concentration stated is 0.001% of the monoester in a composition. It is explicitly stated that di- and triesters are useless. There is no suggestion of the formation of a layer on an object treated according to the invention described, which layer keeps the surface free from bacteria or other microorganisms.
In the method according to the invention a soap solution is used obtained by mixing 2-10 ml, preferably 2-5 ml liquid soap per 100 l water, in particular mains water. The vessels or utensils to be cleaned are then washed with the resulting soap solution, which contains a very low concentration of active agent. It is also possible to immerse the vessels or utensils in the soap solution. After this first method step the vessels or utensils are rinsed with (mains) water, after which vessels or utensils provided with a 100% hygienic soap layer are obtained. This soap layer is visible as a glossy/shiny layer and will give a fingerprint upon contact with a finger.
The above soap layer adheres to substantially all kinds of materials so that the invention also relates to vessels, etc. made of several materials.
The thickness of the soap layer applied can be reduced by starting in the preparation of the soap solution from soap blended with honey, advantageously 10-25 ml honey per 100 ml liquid soap. Microorganisms do not adhere to thus treated surfaces.
Furthermore, the soap solution to be used in the method according to the invention is advantageously prepared on the basis of liquid soap blended with ethanol, e.g. 10-25 ml ethanol per 100 ml liquid soap. With such a blended starting soap the soap solution will be prepared much more satisfactorily and rapidly than without the ethanol addition.
The vessels or utensils according to the invention can be treated within a wide temperature range of 0.degree.-100.degree. C., but is preferably carried out between 10.degree. and 40.degree. C.
The vessels or utensils should meet the requirements of being germfree or bacteria-free and clean before the treatment according to the invention. A possibility to obtain such clean vessels or utensils is to
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Dudash Diana
Fink Edward M.
Michaelson Peter L.
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