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' IV. After Seaming <br />A A smooth insulating plate or heat insulating fabricis to be placed beneath the hot welding <br />apparatus afterusage. <br />B. A slight amount of "squeeze-0ut" or 'Plashing' is a good indiptor that the proper <br />temperatures were achieved. It signfies a proper seam in that some of the melted poymer <br />1 was lateraly extruded out of the seam zone. The pressure should be decreased until ony a <br />minimal amount of hot melt is squeezing out <br />' C. For FMLs of 40 mil thickness and less, a long, low wave4ength pattem in one direction of <br />fhe seam on ifs top surface is indicative of a proper weld. If the wave peaks become too <br />dose together, the machine speed should be increased until a safistadory pattem is <br />present The absence of this wavek;ngth pattem indicates that the machine speed should <br />be decreased. FMLs of 40 mil in thickness and less require considerable visual inspection. <br />There will be no wavy pattem for FMLs greater than 40 mil in thickness due to the inherent <br />stiffness of the thicker material. <br />D. Nip/drive roller marks will always show on the ~surface. Their depth, however, shoukt be <br />visually observable, but just barey evident to the touch. <br />' E The hot wedge device has ony a few adjustments that can be made, but it is very important <br />that they be checked daily. Cleaning of machine should be done at least daily. <br /> <br /> <br />1 <br />1 <br />1 <br /> <br />1 <br /> <br /> <br /> <br />~s <br />J <br />