A-A-2963
3.10.1 Class A, Style 2. Class A, style 2 sealing machines shall be motor driven and capable of being floor mounted. The machine shall be provided with a mechanism to allow rotation of the machine about its longitudinal axis and for locking the machine in any required position. The machine shall be furnished with a pair of flat rollers operated by adjustable pneumatic pressure with an operating range of 40 psi (276 kPa) minimum to 80 psi (552 kPa) maximum, and capable of making a 3/4 inch (19.0 mm) wide seal on supported material. The machine shall have conveniently located controls for temperature, pressure, and speed (dwell time) of the material conveyors. The speed of travel of the material conveyor shall be not less than 13 feet (3.96 m) per minute to produce a dwell time of 4 seconds. The machine shall have an adjustment for the conveyor tension and spacing between sealing bars for obtaining effective heat-seals with sealable material of various thicknesses, a separate switch for conveyor operation, and protective guards for the safety of the operator. The machine shall be furnished with a cooling unit.
3.10.1.1 Speed controller. The speed controller shall be capable of rapid adjustment of operating speeds to obtain 2 to 15 seconds variation in dwell time during the heat sealing travel of the material conveyors. The dwell time shall be indicated on a dial. Means shall be provided for locking the dwell time setting.
3.10.2 Class A, Style 3. Class A, style 3 sealing machines shall be provided with a carrying handle for portability and hand operation. The carrying handle temperature shall not exceed 110 OF (43 OC) operation of the machine at its maximum temperature setting. The sealing machine shall provide for mounting of heat sealing bars and grooved sealing pressure rollers. The rollers shall be loaded under spring pressure capable of being adjusted for the application of effective sealing pressure for a 1 inch wide (25.4 mm) seal on supported material. The in-feed end of the machine shall be flared to facilitate the insertion of the sealable material. The machine shall have provisions for the attachment of a side handle for horizontal hand operation and brackets for bench operation. The machine shall be capable of providing a variable dwell time.
3.10.3 Class A, Style 4. Class A, style 4 sealing machines shall be provided with a carrying handle for portability and hand operation, and a mounting base or brackets for bench mounting. The carrying handle temperature shall not exceed 110 OF (43 OC) during operation of the machine at its maximum temperature setting. The sealing machine shall have a motor with a pair of bands, belts, or chains as conveyors for the sealable material. Sealing pressure shall be provided for a 3/4 inch (19.0 mm) wide seal on supported material by a pair of spring-loaded rollers with adjustable pressure capability located at the outlet end of the machine. The conveyors shall move between a fixed guide on one side and a spring loaded guide on the opposite side to provide contact between the conveyors The conveyors shall have a controlled rate of speed to provide a travel of 200 inches (5.08 m) per minute for the sealable material.
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