A-A-2963
3.7 Interchangeability. All parts and assemblies of sealing machines of the same type, class, style, and manufacturer shall be interchangeable.
3.8 Performance. The sealing machines shall produce effective heat-seals on supported or unsupported material as specified in the contract or order, by the application of heat at the effective sealing temperature, pressure, and dwell time. Heat-seals shall be made in accordance with the material manufacturer’s recommended sealing cycle. The heat-seals shall exhibit a continuous fusion of the sealable material at the interfaces of the material, and shall be watertight.
3.9 Type I. Type I, class A sealing machines shall provide for precise temperature with variable dwell time and pressure controls. Type I, class C sealing machines shall provide precise temperature with constant dwell time and pressure controls.
3.9.1 Class A. Class A sealing machines shall heat-seal unsupported material of 0.003 inch (0.0762 mm) minimum thickness. The sealing machine shall have heating elements in both jaws. The machine shall have a foot pedal assembly with an adjustable compression spring for the operation of the jaws and application of heat sealing pressure and dwell time. A temperature gage shall be provided to indicate the jaw temperature. The sealing machines shall be wired for 120 volt, 60 Hz, single phase, or 220 Volt, 50 Hz, single phase to accommodate type F “Schuko” plugs with round pins as specified in the contract or order. The class A sealing machine is furnished without indicator light or cooling unit.
3.9.2 Class C. Class C sealing machines shall be motor driven, with heating elements in both jaws, and an indicator light to indicate the heating elements are energized. Sealing pressure shall be applied for making a 3/4 inch (19.0 mm) wide seal on supported material by a spring action in the machine, and the heat sealing dwell time shall be dependent upon motor speed. The sealing temperature thermostatic control shall be conveniently located on the machine. The machine shall have a foot operated switch for either single or continuous operation of heat sealing cycles. The machine shall be capable of being bench mounted.
3.10 Type II. Type II sealing machines shall produce a continuous heat-seal as the sealable material is conveyed through the machine. The machine shall have adjustable means for adjustment of the gap between heating bars to obtain effective heat seals with material of various thicknesses, and to take up slack of conveying bands, belts, or chains, as applicable. The conveyors carrying the sealable material through the machine shall be either motor driven continuous bands, belts or chains, except for class A, style 3, which shall have no motor or continuous material conveyors.
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