Cooling element

Abstract

A cooling element includes two layers of a foil material, fastened to one another by welding connections such that a compartment closed for liquid is formed between them and at least one of the layers is vapor-transmitting over at least a portion of its surface area. The two layers of foil material include thermoplastic plastic, or polyurethane, polypropylene, or polyethylene. Alternatively or additionally, the layers of foil material include a weldable material at least at sides that face one another, and the connections are formed by welded connections. The layers of foil material and the intermediate layer may be manufactured from thermoplastic plastics.

1 - 16 . (canceled) 
     
     
         17 . A cooling element comprising:
 two layers of a foil material that may or may not be flexible, the two layers of foil material being fastened to one another by welding connections such that a compartment closed for liquid is formed between them and at least one of the layers is vapor-transmitting over at least a portion of its surface area,   wherein the two layers of foil material comprise thermoplastic plastic, or polyurethane, or polypropylene, or polyethylene.   
     
     
         18 . A cooling element according to  claim 17 , wherein the two layers of foil material comprise a plastic with a moisture-vapor transmittance of more than 3800 g/m2/24 h, according to testing norm ASTM E96-13W, at a water resistance of a water column of at least 4700 mm according to testing norm ISO 811. 
     
     
         19 . A cooling element according to  claim 17 , wherein the layers of foil material comprise a plastic of welding tear resistance of at least 15 kg/3cm, or 3.175 mm RF tear, determined according to testing norm FS191A method 5970. 
     
     
         20 . A cooling element according to  claim 17 , further comprising, between the foil layers, an intermediate layer of liquid-absorbing, vapor-releasing material. 
     
     
         21 . A cooling element according to  claim 17 , wherein the intermediate layer is secured at one or more locations where the layers of foil material are welded together by positioning the intermediate layer around the welding connections. 
     
     
         22 . A cooling element according to  claim 17 , wherein the intermediate layer is secured at one or more locations where the layers of foil material are welded together by constituting at least one of the welding connections through a part of the intermediate layer and blending the welding connections at least locally around the material of the intermediate layer. 
     
     
         23 . A cooling element according to  claim 17 , wherein the intermediate layer further comprises a weldable material and is at least locally welded to both layers of foil material. 
     
     
         24 . A cooling element according to  claim 17 , wherein additional welded connections are provided between the layers of foil material within the circumference of the compartment. 
     
     
         25 . A cooling element according to  claim 17 , wherein an additional layer of weldable foil material is applied between or against the two layers of weldable foil material at an area of at least one of the welded connections. 
     
     
         26 . A cooling element according to  claim 17 , further comprising a protective layer of moisture-transmitting material provided against at least one layer of vapor-. 
     
     
         27 . A cooling element comprising:
 two layers of foil material, between which layers an intermediate layer of liquid-absorbing, vapor-releasing material is accommodated,   the two layers of foil material being fastened to one another by connections such that a compartment is formed between them, while at least one of the layers of foil material is vapor-transmitting over at least a portion of its surface area,   wherein the compartment is in liquid communication with a buffer reservoir via at least one flow restriction.   
     
     
         28 . A cooling element according to  claim 25 , wherein the buffer reservoir is formed adjacent to the compartment between the two layers of foil material and is separated therefrom by a welded seam in which the flow restriction is provided in a form of at least one liquid passage between the compartment and the buffer reservoir. 
     
     
         29 . A cooling element according to  claim 27 , wherein the buffer reservoir has a maximal volume essentially equal to liquid volume of the liquid absorbing vapor-releasing material when this material is saturated with liquid. 
     
     
         30 . A cooling element according to  claim 27 , wherein the buffer reservoir has a content configured to maintain a cooling function of the compartment during an essentially longer time period than a maximal liquid volume of the liquid absorbing vapor-releasing material does when this material is saturated with liquid. 
     
     
         31 . A cooling element according to  claim 27 , wherein the flow restriction is realized as an opening between two welding seams that are in line, in which head ends of the seams adjacent to the flow restriction are rounded.