KR900700870A - Method for detecting the presence of contaminants in reusable plastic food or beverage containers - Google Patents

Abstract

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Description

Method for detecting the presence of contaminants in reusable plastic food or beverage containers

Since this is an open matter, no full text was included.

1 shows a cross-sectional view of a polymeric vessel and sensor having a sensor attached inside the bottom of the vessel. An ultraviolet light source is placed on top of the vessel to irradiate the sensor through the vessel inlet and the photodetector is on the other side of the vessel's lower sensor.

FIG. 1A is the same as FIG. 1 except that the photo detector is located next to the light source above the inlet of the vessel.

2 shows a partial cross sectional view of a polymeric container and a two-layer sensor attached to the container.

3 is a graph showing the relative decrease in phosphorescence of the sensor when exposed to a "Real Pine" household detergent.

Claims (23)

(a) attaching a sensor to the interior of the container causing a change in optical density that can be detected upon exposure to contaminants; (b) exposing the sensor to ultraviolet radiation and measuring the optical density of the sensor by measuring the action of the sensor on ultraviolet radiation; and (c) comparing the optical density of the sensor with that of an uncontaminated standard sensor, to determine whether a particular contaminant is present on or in the fuselage of a plastic reusable food or beverage container. The method of claim 1 wherein the sensor contains two components, one that reacts upon UV exposure and a second component that changes opacity upon exposure to contaminants. The method of claim 2 wherein the sensitive component is phosphorescent or fluorescent. 4. The method of claim 3 wherein the component that changes opacity upon exposure to contaminants is a non-toxic, non-ultraviolet absorbing polymer. The method of claim 4 wherein the phosphorescent component of the sensor contains an inorganic pigment. 6. The method of claim 5, wherein the sensor is irradiated with ultraviolet light of 200 to 300 nm. 7. The method of claim 6, wherein the optical density of the sensor is measured with a light detector operating within the most suitable range for measuring the fluorescence or phosphorescence of the sensor. 8. The method of claim 7, wherein the photo detector measures the phosphorescence of the sensor after at least 1 microsecond of ultraviolet exposure. The method of claim 8, wherein the sensor contains a transparent silicone rubber and zinc sulfide phosphor. 10. The sensor of claim 9, wherein the sensor comprises two layers: a top layer bottom layer attached to the container; The top layer consists essentially of transparent silicone rubber and the bottom layer consists essentially of zinc sulfide phosphor and transparent silicone rubber. The method of claim 10, wherein the photo detector operates in the range of 450-550 nm. The method of claim 2 wherein the sensitive component is reflective. The method of claim 12, wherein the reflective component is a dispersed surface having a refractive index that is different from the metallic surface or the second component. The method of claim 1, wherein the optical density of the sensor is measured by measuring the sensitivity of the plastic container to ultraviolet radiation passing through the sensor. (a) attaching to the interior of the container a sensor that peels or degrades upon exposure to contaminants; (b) plastic foods or beverages for which contaminants are reusable, characterized in that the area of the container to which the sensor is attached is exposed to ultraviolet light and the presence or absence of the sensor is determined by measuring the action of that area on ultraviolet irradiation. A method of measuring whether a vessel has moved into the fuselage. Used to determine whether contaminants are present on reusable or fuselable bodies on reusable plastic food or beverage containers containing two components that are sensitive to exposure to ultraviolet radiation and a second component that changes opacity upon exposure to contaminants. Sensor. 17. The sensor of claim 16, comprising a transparent silicone rubber and zinc sulfide phosphor. 18. The device of claim 17, comprising two layers: a top layer and a bottom layer attached to the container; The top layer consists essentially of transparent silicone rubber, and the bottom layer consists essentially of zinc sulfide phosphor and transparent silicone rubber. It contains two components, one that responds to meridian irradiation and the second, which changes opacity upon exposure to selected contaminants, and is used to determine whether contaminants are present on or moved into the fuselage. Reusable plastic food or beverage container with a sensor attached therein. 20. The container of claim 19, wherein the sensor contains transparent silicone rubber and zinc sulfide phosphor. 21. The sensor of claim 20, wherein the sensor contains two layers: a curved layer and a bottom layer attached to the container; The top layer consists essentially of transparent silicone rubber, and the bottom layer consists essentially of zinc sulfide phosphor and transparent silicone rubber. The method of claim 3, wherein the sensitive component contains a reaction phosphor and a test phosphor. 23. The method of claim 22, wherein a test phosphor is used as a reference to correct optical interference. ※ Note: The disclosure is based on the initial application.