Flexible imaging member belt seam smoothing method
View Patent ↗Apparatus comprising a support member having a flat surface adapted to receive and support a seam region of a flexible belt comprising thermoplastic polymer material having a predetermined glass transition temperature, a heatable member having a smooth heatable flat surface for compressing at least a portion of the seam region of a flexible belt placed on the smooth flat surface of the support member to heat the portion to at least the glass transition temperature of the thermoplastic polymer material, the smooth surface of the heatable member having a profile which is parallel to the smooth flat surface of the support member, and wherein the heatable flat surface comprises a low surface energy or abhesive material.
1. Apparatus for the post treatment of an ultrasonically welded seamed flexible imaging member belt to produce a smooth seam region comprising:
a lower support member having a smooth upper flat surface adapted to receive and support a seam region of a welded seamed flexible imaging member belt comprising thermoplastic polymer material having a predetermined glass transition temperature;
an upper heatable strip having a smooth lower heatable flat surface, the lower heatable flat surface of the heatable strip having a profile which is parallel to the smooth flat surface of the support member, the lower heatable flat surface comprising a low surface energy or abhesive material, the strip aligned for centering over the seam region, and wherein the strip has a width of between about 6 mm and about 30 mm; and
a rotatable compression wheel located so as to contact the upper heatable strip to compress the strip against the seam region;
wherein the lower support member and the upper heatable strip are located so as to directly contact the flexible imaging member belt; and
wherein the rotatable compression wheel moves transversely across the seam region.
2. Apparatus according to claim 1 wherein the strip is a metal or a plastic.
3. Apparatus according to claim 1 wherein the strip is an electrically resistive material or a composite device.
4. Apparatus according to claim 3 wherein the strip comprises a supporting member containing imbedded resistance wires spaced to ensure uniform heating along the length of the strip.
5. Apparatus according to claim 1 wherein the strip raises the temperature of the seam area from about 2° C. to 25° C. above the glass transition temperature (Tg), but below the melting temperature, of the thermoplastic polymer material in at least the charge transport layer of the imaging member belt.
6. Apparatus according to claim 1 wherein the rotatable compression wheel comprises a hard plastic, metal, or composite material.
7. Apparatus according to claim 1 wherein the rotatable compression wheel is a metal wheel with a smooth polished surface.
8. Apparatus according to claim 1 wherein a rotatable compression wheel may be moved manually or automatically.
9. Apparatus according to claim 1 wherein the low surface energy or abhesive material comprises Teflon, fluoro-hydrocarbon polymer, silicone, polyimide, and the like.