![]() In order that the present invention may be fully understood, a brief description follows of the requirements that a bandage of this nature should fulfill. Another object is to reduce the cost of such bandages. It is an object of the present invention to produce a bandage or a bandage unit free from the foregoing and other objectionable features of the present day hard-coated bandages and having other advantages which will apear hereinafter. In some cases it has been found necessary to use a blast of heated air on the cast to accelerate the drying and render the cast of sufficient strength, within a reasonable period of time, to serve the purpose for which it is used. This slowing action is particularly noticeable and objectionable on damp or wet days. The presence of the acid material also slows the drying of the cast and consequently increases the time for the cast to acquire its maximum strength. This leads to the use of excessive amounts of accelerators of the setting of plaster of Paris when equivalent or speedier setting is required. One cause of the loss of strength is the difficulty of eliminating all of the acid or other material used as a retarder in the preparation of the bandage. Casts prepared from them are not as strong in the wet state, that is, immediately after the initial set has taken place, as those prepared from an equivalent amount of plaster of Paris used in a loose plaster bandage. ![]() Bandages prepared in this manner while of value for surgical purposes, have serious disadvantages. The coated gauze is then dried at an elevated temperature, or by treating a roll of gauze containing loose plaster of Paris with a solution of a binding material such as gum arabic and a decomposable M retarder such as the ammonium salts and drying at an elevated temperature to obtain a thin, protective, water permeable coating on the exterior surfaces. Heretofore such bandages have been prepared by coating starch sized or unsized gauze with a paste made up of plaster of Paris, water, a water soluble binder, such as dextrine, and a material that acts as a retarder in the setting of plaster of Paris, such as acetic acid. The present invention deals with the production of bandages of the second or hard-coated type and particularly those in which the quantity of water taken up on immersion can be to some extent controlled. As is well known, the ultimate strength of a plaster of Paris cast is seriously affected by any excess water used and consequently the addition to the bandage of the correct amount of water is a matter of considerable P4 importance. ![]() Furthermore, by tightly winding such bandages in a roll, the quantity of water taken up by the bandage can be to some extent controlled. Such a bandg age has obvious advantages over the loose plaster type, in that dusting, settling and loss of the plaster is minimized. In the second type, or so called hard-coated bandages, plaster of Paris is held on the gauze by means of an adhesive or binder. Considerable plaster is also likely to be lost at this point and it is difficult to control such loss. This uneven distribution tends to make the even application of the plaster quite difficult. Furthermore, when wetted prior to application in the usual manner by setting the roll on one end in a body of water, the plaster tends to fall to one end of the roll. This results not only in the loss of the plaster but is also a source of annoyance, particularly when such plasters are used in the home or a surgeon's office. The plaster dusts out of such rolls with comparative ease when they are handled. One in which loose plaster of Paris is spread as evenly as possible on starch or glue sized or unsized gauze and the gauze is then rolled as compactly as possible. Two types of bandages containing plaster of Paris have heretofore been used for the application of surgical casts. The present 3 application is a continuation in part of my copending application Serial No. This invention relates to the preparation of plaster of Paris bandages for surgical or other uses and consists in a novel process of preparing non-dusting bandages of this nature. ![]()
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