Porous laminated, super absorbent, hydratable, temperature control pack system

A method of making a hydratable, temperature altering packet from two, flexible sheets of material, at least one of which is permeable to liquid, which packet contains a superabsorbent material in particulate form contained within at least one cell formed between the two sheets of material, comprising the following steps:

• a) using for at least one of the sheets of material a sheet having thereon an adhesive, sealing layer on one of its sides;
• b) placing the other sheet of material in juxtaposition to said one of the sheets opposite to its adhesive side, and, in connection therewith, placing some of the particulate superabsorbent material onto said one sheet with a substantial portion of said particulate material being in sticking contact with the adhesive layer, which adhesive layer serves to at least initially hold the particulate material in place on said one sheet;
• and
• c) sealing the two sheets together, forming a cell of substantially greater volume than the supply of superabsorbent material so that the cell contains the particulate, superabsorbent material, and using said adhesive layer to also seal the two sheets together to form the respective cell.

A hydratable packet (10) for producing for juxtaposed goods a temperature environment substantially different in temperature from the ambient for a significant period of time, comprising:

• a backing sheet (11);
• a porous sheet (12);
• a heat activated, tacky sealant layer (13) on at least one of the sheets affixing said sheets (11 & 12) together;
• and
• superabsorbent material (14) in particulate form contained between said sheets, part of said tacky sealant layer underlying, and being in direct contact with some of, said superabsorbent material, causing a substantial portion of the particulate material to stick to the sealant layer;
• said superabsorbent material is initially deposited on one of said sheets unto said tacky sealant layer in the form of a squat-shaped cone.

A hydratable packet (10) for producing for juxtaposed goods a temperature environment substantially different in temperature from the ambient for a significant period of time, comprising:

• a backing sheet (11) made of an impervious plastic sheet material of polyester film;
• a porous sheet (12) of non-woven polypropylene;
• said sheets being devoid of cellulose;
• a heat activated sealant layer (13) of ethylene-methyl-acrylate (EMA) on at least one of the sheets affixing said sheets (11 & 12) together in selected areas forming a cell;
• and
• superabsorbent polymer material (14) contained between said sheets in said cell, said superabsorbent material being doubly-cross-linked sodium polyacrylate, superabsorbent to water and devoid of alcohol (OH) functional groups, said superabsorbent material being in particulate form and said adhesive layer underlying and being in sticking, tacky contact with a substantial portion of said superabsorbent, particulate material, at least initially holding that portion in place on the backing sheet during the manufacture of the packet.