uv lamps of 80 watt cm power produced by quantum s r l at a rate of 20 cm min in this manner a dimensionally stable container with stiffened but non fragile corners is obtained suitable for containing solid or liquid foods an ablative polymer consisting of a sprayable rigid silicone material of the type known commercially as cpc 1050 produced by ge is sprayed onto the film of the previous example the liquid quantity sprayed is chosen such as to create an agglomerate with about 10 vol of ablative silicone on the polyethylene film volume a further film is then applied to the film treated in this manner to form a sandwich which sealedly retains the silicone material after the edges of the two films have been welded together the sandwich film obtained in this manner is used to form a container which was then placed in an oven at a temperature of more then 100 u00b0 c the ablative process gave rise to the formation of gas at high pressure which conferred rigidity to the entire container using the method of the previous example instead of an ablative silicone the polyethylene film was given an application of polyurethane which on transformation into foam stiffened the container a microfilament mesh of 100 150 micron thickness and with square apertures of 1 mm was prepared from a nickel titanium.