although the invention may be made of a large variety of materials , stainless steel and more specifically stainless steel of the 300 series is preferred because of excellent corrosion resistance and stiffness . stainless steel of the 300 series comprises 17 to 25 weight percent chromium , 7 to 21 weight percent nickel and steel . other substances , including carbon , silicon , molybdenum , columbium , tantalum and cobalt may also be present in small amounts . stainles steel series 302 ( 18 weight percent chromium , 9 weight percent nickel and steel ) and series 316 ( 17 weight percent chromium , 12 weight percent nickel and steel ) are preferred not only because of there excellent corrosion and ductility properties but because of ease of welding and fabrication . thickness of the metal used to fabricate invention may vary over reasonably large limits , such as for example 0 . 001 to 0 . 2 inches . preferred limits in thickness are between 0 . 010 and 0 . 050 inches or more preferred from 0 . 02 to 0 . 03 inches . these thicknesses give sufficient stiffness without significantly increasing the resistance of the plunger to penetration into the ice cream slab . an understanding of the invention is facilitated by a description of the drawing . the articles shown there are only illustrative of the invention , particularly as to the shape or outline in the cross - sectional plane . fig1 shows a punching device 10 with circular cross - section . the walls 11 are made of stainless steel and are approximately 2 to 3 inches high . the punching device if fitted with a handle 12 for hand operation , generally made from the same or similar sheet of stainless steel as used for the walls . the handle is approximately u shaped , with the longest , middle portion extending the diameter of the plunging device . each end of the handle is bent at right angles from the longest , middle portion and each end is attached to the wall typically by means of spot welds 13 . the wall is closed on itself by attachment means , typically a weld 14 or solder joint ( particularly silver solder ). fig2 shows a typical plunging device 20 with recangular cross section comprising stainless steel walls 21 , handle 22 typically one to two inches wide attached to walls typically by means of spot welds 23 . the walls , made of stainless steel sheet metal , are typically two to three inches high and bent into the desired cross - sectional shape . the walls are closed in that they define a bounded area in the cross - sectional plane . the wall closing 24 may be accomplished in a variety of ways including welding , soldering etc . fig3 shows a similar plunging device 30 with handle 31 , spot welds 32 for attaching handle to walls and welded or soldered seam 33 . although dimensions of the plunging device are not critical , for some applications such dimensions are important . for example , many ice cream cakes are of a certain dimension . typically , for a circular plunging device , a diameter of approximately eight inches is preferred . for a rectangular plunging device , a length of approximately eight inches and a width of approximately four inches is preferred . for a square plunging device , a length and width of approximately eight inches is preferred .
an article of manufacture and process is described which is useful in making ice cream shapes attractive for consumption . use of these articles permits rapid fabrication of various ice cream products without contamination and permits rapid and effective cleaning of such articles .