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34Choosing Print Materials
To minimize jams, do not use envelopes that:
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Have excessive curl or twist
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Are stuck together
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Are damaged in any way
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Contain windows, holes, perforations, cutouts, or embossing
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Use metal clasps, string ties, or metal folding bars
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Have an interlocking design
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Have postage stamps attached
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Have any exposed adhesive when the flap is in the sealed or
closed position
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Have nicked edges or bent corners
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Have rough, cockle, or laid finishes