Flexible bags – Wall details – Multi-layer or ply
Patent
1986-08-26
1988-07-05
Little, Willis
Flexible bags
Wall details
Multi-layer or ply
383109, 383113, B65D 3008
Patent
active
047550643
DESCRIPTION:
BRIEF SUMMARY
There are known isothermic packages which permit maintaining during a certain interval of time hot or cold alimintary products at an acceptable temperature.
These packages are generally used for transporting a hot or cold product from the place where it is purchased to the place where it is consumed or the place (cold storage, refrigerator, etc.) where it is kept or stocked before being consumed.
Unfortunately, these packages do not offer a satisfactory thermic barrier when the ambient temperatures go beyond the habitual norm or if the duration of the transport is relatively long.
In this case, the temperature of the product attains during the transport a critical temperature by reason of which its appearance, its qualities, its taste are altered in the manner that it becomes unfit for consumption.
The present invention has for its object an isothermic package which permits at least doubling, all conditions and proportions being the same, the duration during which the product is maintained at an acceptable temperature, that is to say situated above or below according to the case of the critical temperature.
This package which is constituted by an envelope provided with an opening for the introduction and removal of the product is characterized by the fact that the walls of the envelope are each formed of a plurality of sheets defining between them at least one closed space filled with fluid. The annexed drawing represents schematically and by way of nonlimiting example a form of execution of the object of the invention and illustrates a process of fabrication of this form of execution of the package according to the invention.
FIG. 1 is a plan view of the empty package.
FIG. 2 is a section along the line II--II of FIG. 1.
FIG. 3 is a section similar to that of FIG. 2 of the package containing a product.
FIG. 4 is a view of a detail.
FIGS. 5 to 9 illustrate the several operations of the process of fabrication of this package.
The package shown in FIGS. 1 to 4 is constituted by a flat souple envelope 10 of rectangular form of which the two walls 11 and 12 are welded on three sides in a manner to provide an opening 13 for the introduction and removal of the product.
Each of the walls 11 and 12 is composed of two sheets 14,15 which confine between them pockets 16 and 17 filled with air or a gas having low power of transmission of heat and a pressure slightly greater than atmospheric pressure.
The pockets 16 and 17 are connected with one another at a side opposite the opening 13 by a passage 18.
The sheets 14 and 15 which are found in commerce are constituted by a layer of plastic material 19 and by a metalized layer 20.
The product to be transported is introduced into the package into the package through the opening 13 then the envelope is rolled beginning with this opening until the product is well held, then the rolled part is fixed with one or two clips possibly with closure means incorporated or not in the package, these means been given a pretensioned disposition.
In the course of rolling, the thickness of the layer of air is increased more or less according to the volume of the product.
The thermic barrier formed by this layer of air and by the double thickness of the walls themselves, constituted by the isothermic sheets permits maintaining during several hours temperatures in the neighborhood of the temperatures of conservation of the product transported or stocked.
It is remarked that by virtue of the passage 18, the continuity of this thermic barrier is not interrupted at the bottom of the package. This is particularly important due to the fact that the bottom of known isothermic packages is generally the place where the heat exchanges--from the exterior to the interior or inversely--are greatest.
In a variant, the air contained in the spaces 16, 17 can be replaced by a liquid, advantageously, a liquid called refrigerant analogous to the liquid utilized in souple "ColdHo Pack" pockets of 3M of which the congealing point is of the order of -18.degree. C.
The isothermic packages thus realized can be st
REFERENCES:
patent: 1942917 (1934-01-01), D'Este et al.
patent: 1993394 (1935-03-01), Bangs et al.
patent: 2430459 (1947-11-01), Farrell et al.
patent: 3082585 (1963-03-01), Waters
patent: 3891138 (1981-05-01), Glas
patent: 4147291 (1979-04-01), Akao et al.
patent: 4462224 (1984-07-01), Dunshee et al.
patent: 4528694 (1985-07-01), Skovgaard
patent: 4662527 (1987-05-01), Moretti
Burns Robert E.
Little Willis
Lobato Emmanuel J.
LandOfFree
Isothermic package does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Isothermic package, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Isothermic package will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2329253