A-A-2953
3.2.8 Electrical cord. Each sealing machine shall be provided with a 6-foot (1.83 m) minimum length electrical cord with plug.
3.3 Type I. Each sealing machine shall consist of a sealing unit with a separate control unit. The sealing machine and control unit shall be interconnected by means of a 10 foot (3.05 m) minimum length electric cable. The control unit shall contain a heating timer, main switch, indicator lamps, and electrical components and connections essential to the performance of the sealer. The sealer operation shall be activated by pressing a switch mounted on the sealer convenient to finger or thumb touch. When activated, the switch shall close an electrical circuit to start the sealing cycle and light the amber indicator light when predetermined pressure has been applied. Predetermined jaw pressure shall be maintained to provide a distortion free seal.
3.3.1 Handle. The heat sealing machine shall have the sealing unit handle and operating switch insulated so when the sealer is continually operated for one hour, the temperature of the handle and operating switch shall not exceed 100oF (37.8oC).
3.3.2 Weight. Excluding the electric cable and separate control unit, the weight of the sealing machine shall not exceed 3 pounds (1.359 kg).
3.4 Type III. The sealing machine shall be capable of being bench mounted with application of sealing pressure by hand or by foot pedal. The sealing machine shall consist of an integral control unit including heating and cooling timers, main switch, and electrical components essential to the operation of the sealer. The heating element shall have current overload protection. The sealing machine shall be capable of passing a continuous web of transparent material no wider than 6 inches (152.4 mm) less than the maximum sealing length through the machine. When a predetermined jaw pressure is attained, the sealing cycle shall be initiated and shall continue until the operator releases the pressure. An amber indicator lamp shall indicate the duration of the sealing cycle. Jaw pressure shall be provided by tension springs or other means. At the end of the sealing cycle, the amber light shall go out indicating to the operator that the applied pressure may be released. All the controls shall automatically reset at the end of each sealing operation.
3.4.1 Integral control unit. The control unit shall be located on the sealing unit and positioned conveniently for the operator. The control panel shall consist of .a master switch, indicator lamps, heating and cooling timers, and all parts and accessories necessary for control of the sealing operation.
3.5 Performance. Sealing machines shall be capable of sealing a minimum of 24 roils (609.6 pm) of low density polyethylene layered material within two seconds. Sealing machines shall be capable of forming sets in the presence of wrinkles, lap joints, overlaying lap joints, and contamination of the heat sealable surface, without exhibiting separation or delamination of the seals.
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