Coating processes – Nonuniform coating – Paper or textile base
Patent
1984-07-13
1986-03-18
Lusignan, Michael R.
Coating processes
Nonuniform coating
Paper or textile base
101426, 106 1505, 106 20, 424 27, 428907, B05D 500, C09D 514, A01N 2534, A61F 1300
Patent
active
045768013
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
(1) Field of the Invention
This invention relates to pesticidal sheets, containers or the like and to methods of manufacturing same.
(2) Description of the Prior Art
There are two main methods for applying pesticidal protection to a surface or area. The first method is to apply the pesticide to the surface by mixing it with a liquid carrier, spraying the mixture onto the surface and allowing the liquid carrier to evaporate, leaving the pesticide as a residue. The pests come into contact with the pesticide and die. These pesticides have an effective life of approximately 3 months. However, their effectiveness can be markedly reduced if the surface is washed or becomes damp, removing the pesticide. Because of the nature of spraying the pesticide onto the surface, a uniform distribution of pesticide cannot be assured and so a relative high toxicity level must be used to ensure effectiveness. Even then, areas of the surface may be missed, allowing the pests to pass through a target zone without coming into contact with the pesticide.
The second method is to employ pest strips which contain a vaporizing pesticide which must diffuse throughout the area to be protected. Again, as the pesticide must be effective throughout the whole area, fairly high toxicity levels must be used. As the pesticide must be able to vapourize, it is generally unstable and means must be provided to control the breakdown of the pesticide or the effective life of the strip would only be from a few hours to e.g. 7-10 days.
For example, Australian Pat. No. 491714 (Herculite Protective Fabrics Corporation) discloses a pesticidal strip where a pesticidal impregnated sheet is enclosed in a nonporous container which allows a controlled migration of the pesticide to the surface of the container. The patent states it is essential to use this form of encapsulation as the pesticides are subject to rapid breakdown (or decomposition) at 100.degree. F. and gives examples of pesticides which have effective lives in open atmosphere, of approximately 7-10 days but which may be effective for up to 90 days using the encapsulation method. Should the container be damaged, the pesticides would rapidly lose their effectivness and the user would be exposed to very high toxicity levels with detremental health effects. The pesticides employed rely on their vapourising characteristics, and leave little, if any, residue.
SUMMARY OF THE PRESENT INVENTION
It is an object of the present invention to provide a sheet container or the like, hereinafter referred to as an item, which is provided with the pesticide to protect the item from pest attack and/or to protect at or adjacent a target zone to kill pests which come in contact with the item.
It is a preferred object to provide a pesticidal item where the protection against pests is available at much lower toxicity levels than for conventional methods.
It is a further preferred object to provide a pesticidal item which has a long effective life.
It is a still further preferred object to provide a pesticidal item which can be easily and economically manufactured.
Other preferred objects of the present invention will become apparent from the following description.
In one aspect the present invention resides in a method of manufacturing an item applicable to a surface or area to proof the item, surface or area against crawling insects, the method including the steps of:
(a) mixing a pesticide with a liquid carrier;
(b) applying the pesticide/carrier solution to the item; and
(c) drying the solution to remove the liquid carrier and to leave the pesticide in or on the item to be contacted by the crawling insects.
In a second aspect the present invention resides in an item manufactured by the above method.
In one preferred embodiment, the pesticide is applied to the surface(s) of the item by printing the presticide/carrier solution onto the item using e.g. a flexopress, offset press or letterpress. Alternatively, the pesticide may be applied by silk screening methods. In other alternative pre
REFERENCES:
patent: 1739840 (1929-12-01), Kendall
patent: 2157449 (1939-05-01), Berg
patent: 3111539 (1963-11-01), Bocker et al.
patent: 4102991 (1978-07-01), Kydonieus
Morrison Bruce J.
Parry Lawrence J.
Lusignan Michael R.
Morrison Bruce J.
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