WO2006018456A1

WO2006018456A1 - Refrigerant for isothermal bags

Info

Publication number: WO2006018456A1
Application number: PCT/ES2005/000375
Authority: WO
Inventors: Francisco Javier Lazaro Ferre
Original assignee: Bertin, Catherine
Priority date: 2004-07-19
Filing date: 2005-06-30
Publication date: 2006-02-23

Abstract

The invention relates to a refrigerant for isothermal bags, comprising crosslinked sodium polyacrylate as a superabsorbent polymer, propylene glycol as a freezing-point-reducing agent and potable water. The inventive refrigerant is introduced into a container which is positioned together with an insulating polyethylene layer between two sheets forming a shopping bag, in order to perform two functions, namely: maintain the cold chain while frozen and fresh goods are being transported from the point of sale to the home, and prevent liquids from escaping in the event of a tear in the bag.

Description

Refrigerant product for isothermal bags

The present invention is part of the thermal packaging sector for the transport of products, more specifically for the food sector.

Currently, within the thermal packaging sector for the transport of food products, there are different types of packaging, isothermal bags, containers, camping-type refrigerators, etc., which must be covered by regulations to control the temperature in food products, and that there are currently two types of cold, one called positive cold, at a temperature between + 2 ° C to +6 ⁰ C, optimal for food products, also called fresh, such as dairy, fish, meat, drinks and the other negative cold, at a temperature between - 25 ° C to - 10 ⁰ C, optimal for frozen products, ice cream, etc.

But most of the existing products, offer users a very short period of time, for example an isothermal bag from a supermarket, which is at room temperature, for example: +25 ⁰ CA + 3O ⁰ C, can offer a maximum duration of time, 1/2 hour for negative cold, for frozen products and for fresh products, positive cold, unfortunately, less time, still, since fresh products are not frozen and therefore the external heat enters more quickly

And the other products, mentioned above, such as thermos, camping type refrigerators, use accumulators, one model for positive cold and other models for negative cold and whose duration of cold time, is not very large, for a number of physical reasons , which are resolved by means of the present invention.

BACKGROUND OF THE INVENTION To avoid these inconveniences Mr. Jaime Aguade Silvera made a Refrigeration Bag, Utility Model 1018834, and an improved Refrigeration Bag Model Utility 1022681, in the first claim that it incorporates an external coating, a layer of insulating material, a layer, preferably plastic , separating and holding the insulating material, and a deposit that extends over all or part of the internal surface that defines the bag; An internal coating keeps said deposit in the right place for its use. Inside the tank has been filled with liquid that can be easily frozen. And in the second utility model it represents a perfection in which the above is included

SUBSTITUTE SHEET (RULE 26) cited more than the bag has a zipper closure and has handles for easy handling and transport.

The mentioned utility models have been withdrawn and have not been implemented.

And Mr. José Luís Falaguera García made a cooler thermo-cooling utility model 1034390, presents one, of the type that defines a compartment occupied by a liquid or thermal fluid, characterized in that it is constituted by a double wall (1-2 ) of plastic or similar, with welds to form cells preferably communicated with each other, between whose walls the chamber that is occupied by thermal fluid is formed, while the outer layer (2) is coated, with a layer of insulating material ( 4), such as polyurethane foam or the like. 2. Thermo-cooled bag according to claim 1, characterized in that the layer of insulating material (4) is wrapped by a plastic film (5) that defines the exposed face of the bag. 3. Thermo-cooled bag according to claim 1, characterized in that the outer plastic film (5) of the bag is provided with a metallized outer film when the bag is used to cool the contained product. 4. Thermo-cooling bag, according to previous claims, characterized in that the cooling fluid permeates a cellulosic product to give the bag more flexibility.

5. Thermo-cooling bag according to previous claims, characterized in that the bag, being heated in a microwave oven where only the temperature of the fluid rises without affecting the different plastic layers, has an outer layer (5) that It does not have metallized film.

6. Thermo-cooling bag according to claim 1, characterized in that the fluid chamber (3) is defined between two polyethylene films or the like (1, 2), joined by welding forming separate rooms (9), whose chambers (3) or not communicate with each other, being regularly distributed on the external surface.

In summary, the mentioned utility models consist of isothermal bags that contain a liquid or gel and that are susceptible to freezing or heating, as needed.

They present a difficulty at the time of manufacture, the product mentioned, which consists of a gel or liquid to cool is not defined and presents a problem at the time of its use since I could drip, and contaminate food products, if

SUBSTITUTE SHEET (RULE 26) the liquid is composed of only water can not reach a freezing temperature below -5 ⁰ C, ice blocks will be formed, with edges that can break the bag, and as the norm for the conservation of ice cream is of -15 ° C, it is obsolete for the mentioned products.

However, experience has shown that it is possible to improve the characteristics of bags for isothermal purchases for cold or heat.

Technical problem raised

It would therefore be desirable that isothermal bags for the transport of food, for example, those used from the supermarket to their homes, offer at least a duration of cold, which approaches at least 3 hours, controlling a temperature between -2O ⁰ C to -1O ⁰ C and the same duration of 3 hours for fresh produce from +2 ⁰ C to +6 ⁰ C.

For this, the present invention focuses on creating an endothermic product for freezer isothermal bags for purchases, which allows maximum duration, to be able to transport food products from the supermarket to their homes, with adequate temperature control and guarantee, to comply with the temperature control regulations for feeding.

Easily, with a single kilo of endothermic product, of the present invention, the duration of cold in the bag, can exceed 8 hours, by way of comparative example, with an isothermal bag on the market, which can be easily found in summer an ambient temperature of +30 ⁰ C, and a freezer isothermal bag of the present invention, at only a freezing temperature of -25 ⁰ C, it turns out that there is a huge difference of +30 ⁰ C + (-25 ⁰ C) is the same at -55 ° C difference, without introducing any frozen product inside, at 4 hours, the difference is +30 ⁰ C + (- 15 ° C) equal to (-45 "C), without having put any frozen product inside, of course, the more frozen products are introduced inside the bag, the longer the cold temperature is inside the frozen isothermal bag with the endothermic product of the present invention.

SUBSTITUTE SHEET (RULE 26) DESCRIPTION OF THE INVENTION

The present invention relates to a new, Endothermic Product for Freezer Isothermal Bags between -O ⁰ C and -8O ⁰ C and is characterized in that chemical products are introduced, which consist of a polymer, composed of cross-linked sodium polyacrylate, which It is the function of a super absorbent of liquids, making the liquids disappear completely, becoming a kind of particles, this absorbent reaction makes, in the event that there is a pore in the bag or breakage, the fluid or liquids do not go outside For this reason, the bag never drips or dirty or contaminates food products.

Another characteristic of the Endothermic Product for Freezer Isothermal Bags between -0 ⁰ C and -80 ° C for purchases, characterized in that another liquid refrigerant product is added, called propylene glycol, product suitable for feeding, in a sufficient percentage, for example 60% so that when mixed with drinking water it produces an endothermic effect, being able to obtain a freezing temperature of -8O ⁰ C and even more if required, increasing the percentage of propylene glycol, this product being compatible with the polymer, crosslinked sodium polyacrylate, causing that the chemical reaction of absorption of the two liquids water and propylene glycol can be carried out, avoiding that in case of breakage or pores of the bag the food products are not mixed or soiled during transport.

Another characteristic of the Endothermic Product for Freezer Isothermal Bags between -O ⁰ C and -80 ⁰ C is that the mixture composed of cross-linked sodium polyacrylate, propylene glycol and water, in an appropriate percentage causes the liquid to never freeze, and prevents it from becoming a solid state, which would make an appearance of the unpleasant frozen isothermal bag to the naked eye, make it difficult to introduce frozen products inside the bag, since ice blocks would have formed, which when forming edges can break the bag.

Other characteristic is that in the freezer isothermal bag between 0 ⁰ C to -80 ⁰ C for purchases, optionally, a direct ink of the thermal chromatic type can be printed on the bag, which changes color according to the temperatures in which it is exposed, and through a range of colors you can know at what temperature is inside the bag, providing users with a thermal visual control, thermometer type.

SUBSTITUTE SHEET (RULE 26) BRIEF DESCRIPTION OF THE DRAWINGS

For a better understanding of what is described in this report, some drawings are attached in which, just as an example, a practical case of realization of the Endothermic Product for Freezer Isothermal Bags between -0 ⁰ C and -80 is represented ⁰ C.

In said drawings, Fig. 1 shows a front, schematic, elevational view of the different elements of the Endothermic Product for Freezer Isothermal Bags between -O ⁰ C and -6O ⁰ C, comprising an outer bag (1), another bag (2) that is inside, which contains a zipper or loop closure, between both bags an insulated sheet (3) of foamed polyethylene is inserted, with a thickness between 2 and 4 millimeters, one on each side of the bag , according to needs, one or more bags (4) containing the endothermic product (5), object of the invention, composed of sodium polyacrylate, crosslinked, propylene glycol and drinking water, are introduced inside both bags and the insulator in an optimal percentage, according to needs, to achieve between -0 ⁰ C to -30 ⁰ C, welding (6) is carried out by thermal heat, which holds the inner bag (2) with the outer bag (1) and closes the bag (4) containing the endothermic product (5) , so that it does not come out or can be manipulated and plastic handles (7) are placed, by means of thermal welding, to facilitate its transport, a direct ink (8) is printed on the sides of the outer bag (1). thermal chromatic type, which changes color when in contact, according to the temperatures in which it is exposed, and a range (9) of colors are also printed, which allows to know at what temperature, the inside of the bag is, facilitating Users, a thermal visual control, thermometer type.

Fig. 2 shows a side of the bag (4) or bags with endothermic product (5) object of the invention.

Fig. 3 shows a front bag with Endothermic Product for Freezer Isothermal Bags between -0 ⁰ C and -6O ⁰ C, comprising an outer bag (1), another bag (2) that is inside, which It contains a zipper or loop closure, between both bags an insulated sheet (3) of foamed polyethylene, between 2 and 4 millimeters thick is introduced, one side of the bag, according to needs, is inserted inside between both bags and the insulator, the endothermic product (5), obsolete of the present invention, in bulk, composed of sodium polyvinyl acrylate, crosslinked, propylene glycol and drinking water, in an optimal percentage, according to

SUBSTITUTE SHEET (RULE 26) needs, to achieve between - 0 ⁰ C to -30 ⁰ C, welding (6) is carried out by thermal heat, which holds the inner bag (2) with the outer bag (1) and closes the bag containing the endothermic product , so that it does not come out or can be manipulated and plastic handles (7) are placed, by means of thermal welding, to facilitate its transport, a direct ink (8) is printed on the sides of the outer bag (1). thermal chromatic type, which changes color when in contact, according to the temperatures in which it is exposed, and boxes are also printed with a range (9) of colors, which allows to know at what temperature, is the inside of the bag , providing users with a thermal visual control, thermometer type.

DESCRIPTION OF A PREFERRED EMBODIMENT

Endothermic Product for Freezer Isothermal Bags for purchases between -0 ⁰ C and -30 ⁰ C. Fig. 3 shows a front bag with Endothermic Product (5) for Freezer Isothermal Bags, comprising two outer bags (1), and another bag (2) that is inside, which contains a zipper or loop closure, between both bags an insulated sheet (3) of foamed polyethylene, 4 millimeters thick, one on each side of the bag, is introduced inside, between both bags and the insulator, the endothermic product (5), object of the present invention, in bulk, composed of cross-linked sodium polyacrylate, propylene glycol and drinking water, in an optimal percentage, according to needs, to achieve between -0 ⁰ C to -30 ⁰ C, welding (6) is carried out by thermal heat, which holds the inner bag (2) with the outer bag (1) and closes the bag with the content of the endothermic product (5) , so that it does not come out or be manipulated ar and plastic handles (7) are placed, by thermal welding, to facilitate its transport, a direct ink (8), of the thermal chromatic type, that changes color is printed on the sides of the outer bag (1) to be in contact, according to the temperatures in which it is exposed, and some boxes are also printed with a range (9) of colors, which allows to know at what temperature, is the inside of the bag, providing users with a control thermal visual, thermometer type.

It is noted that everything that does not alter, change or modify the essential part of the Endothermic Product for frozen Isothermal Bags between -O ⁰ C and -80 ⁰ C for purchases, may be subject to variations in detail.

SUBSTITUTE SHEET (RULE 26)

Claims

1 .- Endothermic Product for Isothermal Bags Freezes for purchases between - O ⁰ C and -80 ⁰ C, characterized in that it comprises a chemical, which is a super absorbent polymer, composed of cross-linked sodium polyacrylate (5), which It is the function of a super absorbent of liquids, the liquid becoming one or a kind of solid particles, this absorbent reaction means that in the event that there is any pore of the bag or due to breakage, the liquids do not go outside, preventing bag drip, dirty or contaminate food products that are inside or outside the bag.

2. Endothermic Product for Freezer Isothermal Bags for purchases between - 0 ⁰ C and -80 ⁰ C, according to claim 1, characterized in that it comprises a liquid propylene glycol product (5), an endothermic cooling product, of the type suitable for feeding.

3.- Endothermic Product for Freezer Isothermal Bags for purchases between - O ⁰ C and -8O ⁰ C, according to claims 1, 2, characterized in that it comprises a product that is potable water (5), which allows controlling the endothermic function that is It is intended, according to the percentage of water that is mixed, with a 40% a temperature of -30 ⁰ C is obtained, and with a 60% a temperature of - 40 ⁰ C is obtained, etc.

4.- Endothermic Product for Freezer Isothermal Bags for purchases between - O ⁰ C and -80 ⁰ C, according to claims 1, 2, 3, characterized in that by means of the application and printing of the bag, a direct ink (8) of the type thermal color, which in contact with the temperature inside the bag, changes color and by

The printing of some boxes (9), a range of colors is represented, which allows to know at what approximate temperature, the bag is inside, providing the user with additional information similar to that of the type of a thermometer.

SUBSTITUTE SHEET (RULE 26)