REFILLABLE AND FREEZABLE ISOTHERMAL BAG AND METHOD FOR OBTAINING THE SAME

Abstract

The invention relates to a refillable and freezable isothermal bag which comprises two plastic bags (6) and (7) and thermal insulation (8) made of polyethylene foam introduced between two bags (6) and (7), including plastic handles (9) joined by heat sealing, the two bags (6) and (7) being joined to each other along a heat sealing line (12), wherein an opening is provided that is envisaged for the introduction of a mixture of water and alcohol, the opening having a composite plastic sheet (1) that has a polyethylene face and a polyester face, the polyester face having a closing means that are water-resistant and tamper-proof provided to close the opening.

Claims

1. A refillable and freezable isothermal bag which comprises two plastic bags (6) and (7) and thermal insulation (8) made of polyethylene foam introduced between two bags (6) and (7), including plastic handles (9) joined by heat sealing, the two bags (6) and (7) being joined to each other along a heat sealing line (12), characterized by the fact that an opening is provided that is envisaged for the introduction of a mixture of water and alcohol, the opening having a composite plastic sheet (1) that has a polyethylene face and a polyester face, the polyester face having closing means that are water-resistant and tamper-proof provided to close the opening.

2. The refillable and freezable isothermal bag according to claim 1, characterized by the fact that the closing means comprise a sheet made of adhesive material.

3. The refillable and freezable isothermal bag according to claim 1, characterized by the fact that the closing means comprise a zipper type closure.

4. A manufacturing method for a refillable and freezable isothermal bag that comprises two plastic bags (6) and (7) and thermal isolation (8) of polyethylene foam introduced between the two bags (6) and (7), characterized by the fact that it consists of placing a composite plastic sheet (1) between the two plastic bags (6) and (7) to make an opening between the two plastic bags (6) and (7) provided for introducing a mixture of water and alcohol, the composite plastic sheet (6) having a polyethylene face and a polyester face, prior to the application of a heat sealing between both plastic bags (6) and (7), the polyethylene face of the composite plastic sheet (1) being sealed to one face of the bag, such that an opening (6) is created between the composite plastic sheet (1) and the bag further to the inside (7).

5. The manufacturing method of a refillable and freezable isothermal bag according to claim 4, characterized by the fact that it includes an additional stage of including crosslinked sodium polyacrylate placed on the inside of a bag made of a polyvinyl alcohol or cellulose paper.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] For the purpose of helping to make the present specification more readily understandable, it is accompanied by a set of drawings that, schematically and by way of illustration and not limitation, represent practical embodiments of the freezable and refillable isothermal bag.

[0019] FIG. 1 shows a front elevation view of a composite plastic sheet, approximately 15 centimeters wide and 20 centimeters high, wherein one of the faces thereof is polyethylene and the other face is polyester.

[0020] FIG. 2 shows a schematic front view of an embodiment of a refillable and freezable isothermal bag, according to the present invention.

DESCRIPTION OF A PREFERRED EMBODIMENT

[0021] In view of the aforementioned figures and, in accordance with the numbering adopted, an example of a preferred embodiment of the invention can be observed therein, which comprises the parts and elements indicated and described in detail below.

[0022] FIG. 2 shows a front view of a refillable and freezable isothermal bag made up of two plastic bags (6) and (7) and thermal insulation (8), made of polyethylene foam, which is introduced between both bags (6) and (7), and by means of heat sealing (9) rigid plastic handles are sealed, which allow the bags to be held for the transportation thereof. The two bags (6) and (7) are connected to each other by a heat sealing line (12) (indicated by a dashed line) which keeps them joined in a non-releasable way.

[0023] One embodiment is characterized in that it uses a sheet (1) of composite plastic with one polyethylene face, the other face being polyester, the size being 15 centimeters wide and 20 centimeters long. Added to the polyester face along the width on one of the sides of the upper part is a water-resistant and tamper-proof adhesive (2), for the purpose of sealing by means of heat sealing between both bags, which make up the isothermal bag, the polyethylene face being sealed to the bag (7) and the polyester face not sealed to the bag (6). As is well known, polyester is not sealed to polyethylene, an opening (11) is left open that is approximately 15 centimeters, through which users in their homes can fill up the bag with water and alcohol and then close it thanks to the adhesive that has been added to the polyester face to prevent the liquid (17) from leaking. Since it is a tamper-proof adhesive it cannot be opened.

[0024] On one side of the bag (6) pictograms or indications are printed, indicating where the opening is and where the water and alcohol liquid must be introduced, indicating the freezing point, according to the mixture of water and alcohol.

[0025] Users in their homes can introduce a mixture of 1 liter of water and 250 milliliters of alcohol 96% from the pharmacy, reaching a melting point of 20 C., allowing the preservation of the frozen products and cool products to be increased. Previously, a liquid superabsorbent is introduced in the inside of the isothermal bag (6) and (7) during the manufacturing thereof, made of crosslinked sodium polyacrylate (17) in order to prevent leakage. To prevent the same from leaking to the outside and the consumption thereof by the users, it is characterized in that a dose of 15 or 20 grams of crosslinked sodium polyacrylate is packaged in a little bag (18) manufactur ed with polyvinyl alcohol or cellulose so that upon contact with liquids it dissolves.

[0026] Since crosslinked sodium polyacrylate, in bulk, is very similar in color and texture to sugar or salt, it is necessary to prevent it from leaking to the outside and the consumption thereof by the users.