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~~ <br />1 II. Equi pment Preparation <br /> A A woridng and property functioning small electric generator must be available within Gose <br /> proximity of the seaming region with adequate extension cords to complete the entire seam. <br /> The generator must be rubber fired, ar placed on a smooth plate such that it is completely <br /> stable so that no damage can occur to the FML Fuel (gasoline or diesel) for the generator <br /> " must be stored off the FML <br /> B. A hot wedge seaming device is a completely self~ontained system known as a "hot shce'. <br /> C. As the hot wedge method is one of melting the opposing surFaces of the two FMLs to be <br />1 joined, no grinding of sheets is necessary or allowed. <br /> D. Tacking of the FML sheets as done in extrudate fillet seaming is not needed. <br /> E. The hot wedge itself, or "anvil", should be inspected to see that it is uniform and reasonably <br /> tapered. Various types are currently available. Some are smooth surfaced while others <br /> have patterned ridges in the direction of the seam. The taper dmensions vary according to <br /> different types of machines. The major point /9r inspection is that no sharp edges should <br /> exist where FML sheet surfaces must pass. <br />F. Knurled rollers for appying pressure on the sheets and driving the device follow the wedge. <br />They should be inspected for sharp surfaces. <br /> G. If a dual, or split, hot wedge seam is being made, the recessed space for the air track should <br />' be examined. <br /> H. As the FML sheet materials pass through the machine, they must wme in contact with the <br /> wedge in osier to heat the material property. Hot wedge welding machines are equipped <br /> with pressure shoes which assure contact between the FML sheet and the wedge as the <br /> material passes through the machine. Once the welding machine has been set up for a <br /> particular FML thickness, further field adjustmerds are not required. The wedge has an <br /> adjustment that is actualy a stopping device to keep the "hot shce', or anvil from being <br /> pulled into the nip/drive rollers. Caution must be taken to ensure that the wedge is not <br /> adjusted too closely to the nip/drive rollers, especially when material is not going through the <br />machine. The drive, or wedge units, must be disengaged before the material runs <br /> completety out of the machine. Serious damage will acwr to the FML sheetsd the wedge <br /> gets pulled through the nip/drive rollers. <br /> h <br />d i <br /> arp comers an <br />rregular <br />I. The front part of the seaming device should be inspected for s <br /> details which may damage the FMLs. <br />' J. Temperature controllers on the wedge device should be checked periodically. <br /> <br /> <br /> <br />' 17 <br /> <br />