Abstract:
A method of manufacturing an expandable member comprising the steps of separating a shaped member from a sheet of cellular spongy material, soaking the member in a solution containing a water soluble binder and water, compressing the member into a container and drying the compressed member. The dried member expands to its original shape and size when placed in water.

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to methods of manufacturing novelty items and, more particularly, is directed to a method of manufacturing expandable members comprised of a cellular spongy material. 
     SUMMARY OF THE INVENTION 
     It is an object of the present invention to provide a method of manufacturing water expandable novelty items comprised of a cellular spongy material. 
     It is another object of the present invention to provide a method of manufacturing a compressed hydrophilic member which expands when it comes in contact with water. A member of predetermined shape is removed from a sheet of cellular spongy material and placed in a solution containing a soluble binder. After the solution is absorbed, the member is compressed into a container having a volume which is substantially less than the volume of the member. Then, while compressed in the container, the member is partially dried until the binder sets. Finally, the compressed member is removed from the container and allowed to dry completely. When the compressed and dried member is placed in water, it expands to its original size and shape. 
     Other objects of the present invention will in part be obvious and will in part appear hereinafter. 
     The invention accordingly comprises the processes together with their steps, elements and interrelationships, that are exemplified in the following disclosure, the scope of which will be indicated in the appended claims. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     A fuller understanding of the nature and objects of the present invention will become apparent upon consideration of the following detailed description taken in connection with the accompanying drawings wherein: 
     FIG. 1 is a plan view of a shaped form which has been cut from a cellular spongy material; 
     FIG. 2 is a schematic diagram illustrating the soaking step in the process of the invention; 
     FIG. 3 is a schematic diagram illustrating the compressing step in the process of the invention; and 
     FIG. 4 is a side view of an expandable member made according to the present invention in its compressed state. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring now to the drawings, particularly FIG. 1, there is shown a shaped form 10, for example a dolphin, which has been separated from a sheet of cellular spongy material 12. In the preferred embodiment, dolphin 10 is separated from the sheet material by cutting, for example die cutting process. Cellular spongy material, for example a reticulated polyethylene foam material which is one-half inch thick, has been chosen because of its excellent water absorbing properties. It is to be understood that any open cell material having excellent hydrophilic properties can be used for the shaped forms. Although a dolphin shape has been shown, it is to be understood that a variety of different shapes can be cut from sheet 12. After dolphin 10 has been cut from the sheet 12, it is placed in a vessel 14 containing a solution 16 comprising a soluble binder and water, for example. In the preferred embodiment, the solution is comprised of one part of a water soluble colloidal protein, such as gelatin, and thirty-two parts of water. In an alternative embodiment, a pharmaceutical binder is substituted for the gelatin. In another embodiment, the solution includes one part of a water soluble colloidal protein such as gelatin or a pharmaceutical binder, two parts of sorbic acid and thirty-two parts of water. 
     The dolphin figure 10 is allowed to soak in the solution 16 for a sufficiently long time to allow the dolphin figure to absorb the solution. Next, dolphin figure 10 is removed from the solution 16 and squeezed into a container 18, for example a cube shaped container with an open top as shown in FIG. 3. Container 18, for example a blister pack comprised of a clear plastic, has a volume which is at least one-fifth the volume of dolphin figure 10, preferably one-tenth of the volume of the dolphin figure. In the illustrated embodiment, by way of example, each side of cube 18 is one-half inch. The length of the dolphin figure 10 is four inches, the widest part of the body is approximately one inch, and the thickness is one-half inch. Next, the dolphin figure 10 is compressed into container 18 by pushing on a cover plate 20. It is to be noted that the dolphin figure 10 is contained completely within the enclosure formed by container 18 and cover plate 20. 
     Next, the compressed dolphin figure 10 is partially dried until the soluble binder sets and its cohesive properties hold the dolphin figure in a compressed state. In order to expedite the drying processing, the dolphin figure 10 and container 18 are placed in a heated environment, for example, an oven, or are subjected to a stream of hot air, or pass through a vacuum tunnel. In addition, a dehumidifier is employed in the drying process. 
     In a preferred embodiment, cover plate 20 is removed and the partially dried dolphin figure 10 is completely dried in container 18. Preferably, container 18 is a clear plastic blister pack or other package which is suitable to be sold to consumers. The completely dried dolphin figure 10 is shown in FIG. 4. 
     In an alternate embodiment, rather than drying figure 10 in container 18, the compressed and partially dried dolphin figure 10 is removed from the container. Since the soluble binder has set, the dolphin figure 10 retains the shape of the enclosure formed by container 18 and cover 20. Then, the compressed and partially dried dolphin figure 10 is completely dried and remains in the cube form shown in FIG. 4. This final drying step can be accomplished in a variety of apparatuses, for example an oven, a hot air device or a vacuum tunnel. 
     When the dried and compressed dolphin figure 10 is placed in warm water, the cohesive properties of the soluble binder are released and the dolphin figure returns to its original shape and size shown in FIG. 1. 
     Since certain changes may be made in the foregoing disclosure without departing from the scope of the invention herein involved, it is intended that all matter contained in the above description and depicted in the accompanying drawings be construed in an illustrative and not in a limiting sense.