RU2538450C1 - Cold indicator - Google Patents

Abstract

FIELD: food industry.

SUBSTANCE: cold indicator consists of two equal transparent rectangular sheets of a non-toxic strong flexible cold-tolerant material, tightly connected with overlap along the perimeter and divided with radial partitions into several peripheral sectors and one central sector. All the sectors are connected to the central sector by means of 1-3 mm diameter holes of a perforated seam limiting the central sector and have grooves. A fresh-water ice granule is placed in each groove of the peripheral sectors; potassium permanganate KMnO₄ monocrystals are placed in the central sector groove.

EFFECT: information validity and objectivity and multiple application possibility.

2 dwg

Description

The invention relates to the food industry, and more particularly to devices for controlling the environment in which perishable products are located.

A device is known according to patent RU 2426679 C2 MKI B65 D 79/02 for measuring storage characteristics of food packaging blocks? stored in warehouses: by mechanical stresses (floor pressure), humidity, damage to packages and other parameters, including temperature indications within 15-20 ° C for 24 or 48 hours, consisting of panels that are installed in contact with the unit -packages equipped with sensors, the information from which is transmitted to the remote indicator by means of firmly connected wiring or radio communications and is reflected in the color field.

The disadvantage of the device is the complexity of the design, the availability of communications, the need for a source of electric energy, high cost, etc., which increase unproductive costs.

The device "Defrosting Indicator" MKI RU 2018098, intended primarily for domestic refrigerators, comprising a rigid case consisting of two transparent glass identical truncated hollow vessels-cones with metal bases connected along the circumference of the section, one of which is partially filled with water. The device is placed in the refrigerator so that the cone with frozen water is on top. The fact of defrosting is determined by the presence of water or ice in the lower cone of the housing. The disadvantage of the device in the limited target application, the requirement of mandatory compliance with the conditions of verticality, rigid dimensions, the inadmissibility of deformation of the structure, etc.

Currently, a simple, low-cost, objective, reliable device for determining the temperature of the storage medium of perishable products for the entire storage period, up to the sale of goods, does not exist.

The goal is to develop a device to solve the problem.

This goal is achieved in that the device consists of two identical transparent sheets, for example, a rectangular shape of a non-toxic durable flexible cold-resistant material, connected overlaid tightly around the perimeter and separated by beam partitions into several peripheral sectors and one central, all sectors are connected to the central sector through holes with a diameter 1-3 mm of a perforated seam bounding the central sector and equipped with holes; granules are placed in each well of the peripheral sector and freshwater ice, and in a hole in the central sector, single crystals of potassium permanganate (potassium permanganate - KMnO4) are placed.

FIG. 1. The indicator of cold. Section along the vertical central plane.

FIG. 2. The indicator of cold. The lower part (sheet) in curb form.

Device (see Figs. 1 and 2). The cold indicator consists of two identical sheets, for example, of rectangular shape - the top 1 and bottom 2 of a transparent non-toxic durable flexible cold-resistant material, such as polyethylene, which are tightly sealed around the perimeter 3 and separated by beam partitions into several peripheral sectors and one central, all sectors are connected with the central sector through holes with a diameter of 1-3 mm perforated seam bounding the central sector.

The bottom sheet 2 is molded with recesses - holes 4 so that in each sector there would be at least one hole. In the center of the hole 5, the volume is smaller than the holes 4. Solvent 6 is placed in the peripheral holes 4. Fresh water in the solid state of aggregation is used as the solvent — ice granule 6 with a diameter of about 3-9 mm. Dye 7 is placed in the central well 5. Dye requirements: non-toxic, solid state in the temperature range (-50) - (+50) ° С, good solubility with solvent 6, in this device with fresh water, when interacting with the solvent, give a bright color solution, the sufficiency of a small dose and low cost. The device used single crystals of potassium permanganate 7 (potassium permanganate) - KMnO4.

The top sheet 1 is combined with the equipped bottom sheet 2, the air is displaced and hermetically fastened (welded) along the perimeter 3 with each other and immediately placed in a container with deep cold. On the cold indicator there is a passport 1 of goods pre-printed on sheet 1 (or enclosed inside)

The principle of operation of the cold indicator is based on the absence of contact of the solvent with the dye, in this case the cold indicator is transparent, which objectively proves that it was in a negative temperature environment.

 In a cold environment, in operation, the cold indicator can occupy an arbitrary position: horizontal, vertical, bent at an angle, folded in half, in a crumpled state, as well as in a squeezed state. Wells 4 and 5 can be deformed inward, and granule 6 of ice is destroyed, but there is no contact with the dye.

 At a positive temperature, the ice granules 6 melt, the solvent 6 passes from a solid state to a liquid and begins to spread throughout the peripheral sector. In this case, there are two circumstances: firstly, a sector with a hole 5 will be higher and the liquid will tend downward, and secondly, with a tight fit of sheets 1 and 2, a capillary effect will appear between them, which facilitates the penetration of liquid (water) . Solvent 6, free water, penetrates through the perforated holes 10 into the central sector with dye 7, which gives a bright red color, which proves the effect of positive temperature.

 The indicator can be applied:

 to control the storage environment of perishable products in the hold of a vessel, railway carriage, near a wall or roof, in an auto trailer, a temporary warehouse, between boxes and block-packages of goods;

 to control the direct environmental impact on perishable products, such as carcasses of meat, a block of frozen fish.

Commercial effect

The risk of acceptance of substandard perishable goods in repeated frozen form is practically eliminated.

Consumer effect

In a single factory packaging of retail perishable goods, for example, a package of 400 g of dumplings, sausages, minced meat, meatballs, semi-finished products, ready meals, etc., which will confirm the quality guarantee and responsibility of the entire chain from the supplier to the consumer.

Claims (1)

Cold indicator made by a sealed transparent vessel with ice, characterized in that it consists of two identical transparent sheets of a rectangular shape, non-toxic, durable, flexible, cold-resistant material, connected tightly around the perimeter and separated by beam partitions into several peripheral sectors and one central, all sectors are connected to the central sector through holes with a diameter of 1-3 mm perforated seam bounding the central sector, and provided with holes in each hole per In the peripheral sector, a freshwater ice granule was placed, and KMnO4 single crystals of potassium permanganate were placed in the hole in the central sector.

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