ES2245838B1 - FREEZING ISOTHERMAL BAG FOR PACKING. - Google Patents

Abstract

Freezer isothermal bag for packaging. It includes plastic bags (8) and (12), which by welding (11) are divided into cavities, inside it is introduced sheets (9) of foamed polyethylene, together with water (10), sodium polyacrylate and propylene glycol, It produces a chemical reaction that totally absorbs liquids, and prevents dripping, in the case of breakage, and allows to reach a freezing of - 30 ° C. The bags are placed inside the box in an upright position, facilitating the introduction of food. To increase the thermal isolation, a sheet (2) of die-cut polyethylene is used in the form of an unfolded box and in which, through the application of heat, grooves (6) are formed that allow the sides to be folded, to assemble said box.

Description

Freezer isothermal bag for packaging.

Technical sector

The present invention falls within the sector of thermal packaging for the transport of products, more in concrete for the food sector.

State of the art

Currently, within the packaging sector thermal 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, positive, at one temperature between + 2ºC to + 3ºC, optimal for products of food, such as dairy, fish, meat, drinks and other negative cold, at a temperature between -23ºC to -7ºC, optimal for frozen products, ice cream, etc.

But most of the existing products, offer users a very short period of time, of conservation, for example an isothermal bag of a supermarket, which is at room temperature, for example: + 23 ° C, can offer a maximum conservation of time, 1/2 hour for cold negative, for frozen products and for fresh products, cold positive, unfortunately, less conservation time, yet, already that fresh products cannot be frozen.

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

Technical problem raised

It would therefore be desirable that the packaging isothermal for food transport, for example, those that They are used from the supermarket to their homes, offered as minimum, of conservation of the cold that approaches more than 4 hours, controlling a temperature between -20ºC to -7ºC for products Frozen and the same for fresh produce.

Because, because the displacement of cast in the food transport from the supermarket to their homes a minimum of 3 to 4 times is required hours.

For this, the present invention focuses on create a packaging product that allows maximum durability, reach between 12 and 24 hours of cold storage, to be able to transport food products from the supermarket to their homes, with guarantee and adequate temperature control, for prevent toxins from forming in food.

Description of the invention

In its essence, the freezer isothermal bag for packaging, for distribution of food products, characterized in that it comprises plastic bags, whose plastic material can withstand low temperatures, and that in its inside contains some cavities, which are made, by means of constant heat welds, inside these cavities from the bag, they are introduced; foamed polyethylene sheets, in order to act as thermal insulator, and also make the function of giving a certain solidity to the bag, which allows it to keep rigid, if placed vertically, on each side of the inside a box.

Inside the bag in its cavities, it introduce water and crosslinked sodium polyacrylate, water if freezes makes the function of cold accumulator and polyacrylate of crosslinked sodium, it makes the chemical function of a super absorbent, forming a kind of gel, which prevents dripping, in the case of that there is, in the bag, a pore or breakage and that it is in contact With food products.

Crosslinked sodium polyacrylate is a suitable product, for skin contact, since this product It is usually applied in the manufacture of hygienic diapers for You drink them, like a super absorbent.

Now, with the present bag invention Isothermal freezing for packaging, if frozen, you get a cold storage bag, which as we use water, will freeze to from -0 ° C being able to reach a maximum temperature at -3 ° C, therefore, these bags are optimal for be used to keep the cold positive, fresh products between + 2 ° C to + 3 ° C, as an example; dairy products, meats, etc.

For frozen products, which are required low temperatures between -30ºC to -7ºC, it is solved with another characteristic of the present invention, of the isothermal bag freezing for packaging, by using a product refrigerant, called propylene glycol, suitable for food, which is introduced into these cavities of the bag, in a percentage, according to needs, for example; with 30% propylene glycol and water, an endothermic product is obtained, being able to reach some low freezing temperatures of -40ºC.

Freezer isothermal packaging bags of the present invention, they can be made of different cavities, of 4 or 3 according to the needs, in order to be able to place inside a box, surrounding and forming all sides of it, in order to form a thermal barrier, to prevent outside heat from entering inside the box, How freezer isothermal packaging bags act as cold accumulators, if previously frozen, result in they act as a cold engine and by placing them inside the box, on all sides, becomes like an igloo, forming a thermal barrier, which makes the duration very superior, that if they are introduced in a cumulative box, without closing totally all its sides, heat enters easily.

Another feature of isothermal bag freezers for packaging for the distribution of fresh products and frozen, characterized in that to increase insulation thermal, optionally, a polyethylene sheet is used foamed, of a thickness, between 1 cm. or 2 cms, die cut in the form of unfolded box and in which by applying heat, it they form slits that allow folding the sides to arm said box, to fit inside a plastic box, or cardboard, optionally, are made by heat application, earmuffs, on both sides, which allows adapt better to plastic boxes, when boxes are used stackable, which at its base have a narrower shape, than in the top of the box, which allows them to be stacked, to occupy less space in the warehouse.

Another feature of polyethylene sheet Foaming mentioned above, is the possibility of improving the thermal insulation and cleaning, if they adhere to both sides, by heat and pressure, two colored polystyrene sheets aluminum.

Description of a preferred embodiment

The present invention is illustrated by present examples, which is not intended to be limiting of its scope.

Example 1

The freezer isothermal bag for packing, for positive cold, for distribution of food products, (fig. 2, 3, 4, 5, 6, 7 and 8) consist of bags (8) and (12) of plastic, optionally 70% polyethylene and 30% color polyamide transparent bluish, which by welding (11) heat constant or by impulses 4 and 3 cavities are realized, according to the needs, to be able to introduce inside plates (9) or Foamed polyethylene sheets between 1 cm thick. or 2 centimeters, which act as thermal insulator and also offer a stiffness to the bag, which allows, can be held in position vertical, in the same cavities water (10) is introduced, with a super absorbent chemical, polyacrylate sodium, crosslinked, which acts by absorbing all of the water, which avoid contact with products in case of breakage or pores food Therefore an isothermal bag is achieved freezing from -0ºC to -30C to act as positive cold accumulator to maintain optimum temperature between + 2ºC + 3ºC in fresh produce.

Example 2

To get the freezer isothermal bag for packaging, for frozen products, at temperatures between -30ºC to -10ºC, it is introduced into the cavities of the bag (10) of the present invention, together with water and sodium polyacrylate cross-linked, a product called propylene glycol, which acts doing the endothermic function, which allows to reach a freezing, at the desired temperature, for example: to achieve a temperature below -40ºC, if it is introduced in a 30% percentage, along with water.

Example 3

The freezer isothermal bag for packing, for distribution of food products, it becomes a excellent packaging, as shown in (Fig. 8), which using a simple cardboard box (13) in which the 4-pocket bag (fig. 6), forming the 4 inner sides of the box (8), the cover, back side, base and front side, next to each side 2 bags are placed, of a single cavity (12) forming the sides, leaving the box inside completely surrounded through the bags, forming like an igloo, a barrier thermal, ready to introduce food products in inside and close it tightly, keeping the products during a conservation time of approximately between 24 and 48 hours, according to the needs of the product and transportation.

Example 4

For home delivery, from the supermarket, a plastic box is used (fig. 1), are made 2 bags with 4 cavities each (fig. 3) and 2 bags with 3 cavities each (fig. 4), which will form the sides (Fig. 5) of the inside the plastic box, (8) and (9) and that the vertical bags on each side, thanks to the rigidity that provides you with the thermal insulator inside the bags, of the water, crosslinked sodium polyacrylate and propylene glycol.

To increase thermal insulation, optionally, a polyethylene sheet is used (Fig. 2) foamed, of a thickness, between 1 cm. or 2 cms, die cut in the form of unfolded box and in which by applying heat, it they form slits (6) that allow folding the sides to assemble said box, to fit inside a plastic box (fig. 1), or cardboard (fig. 8), optionally, are made by application of heat, earmuffs (7), in both sides, which allows to adapt better to plastic boxes, when stackable boxes are used, which at their base have a more narrow, which on top of the box, allowing them be able to stack them, to occupy less space in the warehouse.

It is noted that everything that does not alter, change or modify the essentials of the freezer isothermal bag For packaging for distribution of food products, it may be subjected to variations of detail.

The attached drawings illustrate, by way of non-limiting example, an embodiment of the bag freezer isothermal packaging for product delivery fresh, frozen, of the present invention.

Brief description of the drawings

For the best understanding of how much is left described herein, some drawings are attached in the that, just as an example, a case study is represented of realization of the isothermal cold bag for packing for distribution of fresh and frozen products.

In these drawings the (Fig. 1) shows a view schematic of a plastic box (1) type of those used in supermarkets for home delivery.

In (Fig. 2) shows a front view of a foamed polyethylene sheet, to increase insulation thermal die cut in the form of an unfolded box and in which the application of heat, some slits are formed numbers (6) that allow folding the sides to assemble the box and adapt to the plastic box (1) inside, (Fig. 1), allowing to form all sides, numbers (3), (4), (5), and numbers (7) optionally, some indentations are also made, with heat earmuffs, which allow to adapt to the plastic boxes that they have a cubic shape at their base, narrower than in the part top of the box, so you can stack them when they are empty, to that occupy less space in the warehouse.

Another feature of polyethylene sheet Foamed (2) mentioned above, is the possibility of improving Thermal insulation and cleaning, if adhered to both sides, by heat and pressure, two colored polystyrene sheets aluminum.

The (Fig. 3, 4, 6, and 7) show a view front of freezer isothermal bags for packaging plastic, one with four cavities, another with three cavities, and another with a cavity, which are the bags that act as accumulators of cold, and that are introduced inside the box (Fig. 5) and (Fig. 8), on each side of the box, the number (11) are the welds that have been made by applying heat, to form the cavities of the bags, the number (9) are the sheets of foamed polyethylene, which act as thermal insulator and offer stiffness to the bag, the numbers (10) are the compound of water, crosslinked sodium polyacrylate and propylene glycol, which act as accumulator and cold engine, turning water and propylene glycol in a kind of gel, which prevents, in case of breakage dripping and that Be in contact with food products.

(Fig. 5) shows a front view of a plastic box (1) with its covers open, in which it has introduced a foamed polyethylene sheet (2) that closes Hermetically, the products that are introduced inside, the isothermal bags (8) containing, cavities with sheets of foamed polyethylene (9), and the water compound, polyacrylate of crosslinked sodium and propylene glycol (10), which act as accumulators and cold engine, all bags are placed in vertical position on the sides of the inside of the box, to close and form a thermal barrier, to protect the products from power that are introduced inside the box.

The (Fig. 6) shows a view in position front, in elevation, of a freezer isothermal bag for packing (8), with 4 cavities, and another (Fig. 7) with a single cavity (12), with the welds (11) and their corresponding sheets of foamed polyethylene (9) together with the water compound, cross-linked sodium polyacrylate and propylene glycol (10) acting as cold accumulators.

Fig. 8 shows a front view of a box cardboard, in which it is inside, the elements cited (Fig. 6 and 7) adapting the freezer isothermal bags for packaging, on each side, forming a barrier thermal, of the igloo-like type, allowing the content that is inserted inside the box, is closed, Hermetically, on all sides.

Claims (7)

1. Freezer isothermal bag for packaging, for the transport and distribution of fresh and frozen products, comprising plastic bags (8) and (12), thermal insulation (2) and a plastic box (1) or cardboard (13) and characterized in that it comprises of the following elements:

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Water.

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Sodium polyacrylate crosslinked

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Propylene glycol.

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Foamed Polyethylene

2. Freezer isothermal cold bag for packaging, according to claim 1, characterized in that in the bag, by means of the application of constant or pulse heat welding, cavities (11) are made, and into which water (10) is introduced , which has the effect of cold storage, does freeze. 3. Freezer isothermal cold bag for packaging, according to claim 1 and 2 characterized in that the cross-linked sodium polyacrylate is introduced into the bag, inside its cavities (11) and next to the water (10), which is a super absorbent of liquids, which prevents dripping, in the event that a pore or breakage occurs in the plastic bag. 4. Freezer isothermal cold bag for packaging, according to claim 1, 2, and 3 characterized in that in the bag inside, in its cavities (11) and together with the water (10) and cross-linked sodium polyacrylate, it is also introduced Propylene glycol, which acts as an edothermic product, which allows it to reach its freezing point, at temperatures of -80ºC, if required, according to the percentage, when mixed with water. With a percentage of 40% propylene glycol mixed with water, an endothermic temperature of -30ºC, optimal to keep the cold of frozen products. 5. Freezer isothermal cold bag for packaging, according to claim 1, 2, 3, and 4 characterized in that in the bag inside its cavities (11) and next to the water (10), cross-linked sodium polyacrylate, and propylene glycol is introduce a foamed polyethylene sheet (9) of a thickness of between 1 cm. or 2 cm., which acts as a thermal insulator and offers the bag a rigidity that allows it to be easily placed vertically, on each side of the inside of a box. 6. Freezer isothermal cold bag for packaging, according to claim 1, 2, 3, 4, and 5 characterized in that to increase thermal insulation, optionally, a foamed polyethylene sheet (2), of a thickness between 1 cm and 2 cm, stamped in the form of an unfolded box and in which by means of the application of heat, slits (6) are formed that allow the sides (3), (4), (5), (7) to be folded to assemble said box . 7. Freezer isothermal cold bag for packaging, according to claim 1, 2, 3, 4, 5, and 6 characterized in that, optionally, in the foamed polyethylene sheet (2) to improve its thermal insulation and cleaning, adheres to both sides, by heat and pressure, two sheets of aluminum polystyrene.