Urea cold pack having an inner bag provided with a perforated seal
First Claim
1. In a refrigerating pack for use in providing a decrease in temperature from the ambient temperature comprising a group of three pliable sleeve type plastic bags, two of said bags being of approximately the same size and strength and forming the exterior and contiguous interior major liners of the pack, an inner bag comprising a minor liner being formed as a sleeve type bag and having dimensions and strength substantially less than the combined major liners enveloping said inner bag, the upper marginal seams of said major and minor liners being co-extensive and sealed together to form the upper end of the pack, the lower end of the minor liner having a closing seam being capable of pressure rupture upon application of manual force, said inner bag having a seal extending below the upper marginal seams, the improvement which consists of a perforation provided through said inner bag within the seal provided below the upper marginal seams to provide a pressure relief at the time of activation of the pack to prevent the pressure from acting against the upper marginal seams and thereby cause rupture of the pack proximate said seams, the inner bag disposed for holding a quantity of water, the interior major liner disposed for holding a quantity of urea which upon reaction with said water provides for the decrease in temperature, the ratio by volume of the urea to water contained in the pack being between about a 1 to 1 ratio to a 2 to 1 ratio.
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Accused Products
Abstract
In a thermal pack, one which may be provided with ingredients for making it either a cold pack or a hot pack, three bags are provided for the container of the pack, two of said bags being of the same size and comprising the exterior and proximate interior liners of the pack, while another bag of lesser dimensions forms the inner liner of said pack, and is disposed within the two larger bags. The inner bag is designed for holding a quantity of water, while the interior liner of the two outer bags is provided for holding a quantity of chemical means for use in varying the temmperature of the desired type pack. Rupturing of the inner bag through manual pressure allows water to react with the chemical means for creating either the cold or hot temperature, as needed.
112 Citations
8 Claims
- 1. In a refrigerating pack for use in providing a decrease in temperature from the ambient temperature comprising a group of three pliable sleeve type plastic bags, two of said bags being of approximately the same size and strength and forming the exterior and contiguous interior major liners of the pack, an inner bag comprising a minor liner being formed as a sleeve type bag and having dimensions and strength substantially less than the combined major liners enveloping said inner bag, the upper marginal seams of said major and minor liners being co-extensive and sealed together to form the upper end of the pack, the lower end of the minor liner having a closing seam being capable of pressure rupture upon application of manual force, said inner bag having a seal extending below the upper marginal seams, the improvement which consists of a perforation provided through said inner bag within the seal provided below the upper marginal seams to provide a pressure relief at the time of activation of the pack to prevent the pressure from acting against the upper marginal seams and thereby cause rupture of the pack proximate said seams, the inner bag disposed for holding a quantity of water, the interior major liner disposed for holding a quantity of urea which upon reaction with said water provides for the decrease in temperature, the ratio by volume of the urea to water contained in the pack being between about a 1 to 1 ratio to a 2 to 1 ratio.
Specification