it is preferred that the cover 45 be resistant to penetration by liquids with the construction of the package as described above when the hot melt is applied as shown and described with respect to fig4 the air tight seal between plate 21 and cover 45 closes off the escape route of steam to the outside but for the construction of the present invention the pressure of the steam would be high enough that it would pass through the hot melt rendering the hot melt caulking ineffective because oil and moisture then could pass into the raw edge 24 and saturate the paper and damage the integrity of the package it is preferred that there be an air gap 26 a between at least a portion of the cover membrane 45 and the outer surface 46 of the valve disk 31 to provide for the release of steam should any be generated in the plate 21 during and shortly after the application of the hot melt 35 this gap 26 a would allow for steam if steam is generated to move in the direction of the arrows 26 b and be discharged through the opening 6 into the chamber 19 fig4 shows the steam 39 s path 26 b as it exits plate 21 steam can exit plate 21 through edge 25 upon exiting edge 25 of plate 21 the steam enters air gap 26 a once the steam is in air gap 26 a it.