1. A printhead comprising:
an elongate support having a plurality of internal webs protruding from a base section to define a plurality of parallel fluid supply channels;
a shim supported by the support and defining a plurality of rows of openings through which fluid from respective supply channels is supplied; and
a plurality of elongate printhead modules supported serially on the shim, each module defining a plurality of fluid supply passages through which fluid passes to fluid ejection nozzles from respective rows of the openings, either end of each module defining complementary formations such that adjacent modules nest together.
2. A printhead as claimed in claim 1, wherein the complementary formations are stepped.
3. A printhead as claimed in claim 1 comprising a pair of molded endcaps mounted on either end of the support which is extruded.
4. A printhead as claimed in claim 3, wherein one of the endcaps defines a plurality of fluid inlet tubes in fluid communication with respective fluid supply channels.
5. A printhead as claimed in claim 4, wherein the other endcap defines a plurality of serpentine grooves to equalize the gas pressure in respective fluid supply channels.
6. A printhead as claimed in claim 1, wherein each module has a shield plate covering the ejection nozzles and defining slots in register with the ejection nozzles so that fluid can be ejected through the slots.
7. A printhead as claimed in claim 1, wherein the support is shaped to provide a form-lock for retaining opposite edges of the shim as a snap fit.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A composition consisting of:
at least one lubricant based on at least one polyol ester obtained from a polyol having a neopentyl backbone, or at least one polyvinyl ether;
a refrigerant consisting of 3,3,3-trifluoropropene and at least one hydrofluorocarbon selected from the group consisting of 1,1,1,2-tetrafluoroethane, 1,1-difluoromethane, and pentafluoroethane; and
optionally at least one of a compatibilizer, a surfactant, and a solubilizing agent.
2. A composition consisting of:
at least one lubricant based on at least one polyol ester or at least one polyvinyl ether;
a refrigerant consisting of 3,3,3-trifluoropropene and at least one of 2,3,3,3-tetrafluoropropene and trans-1,3,3,3-tetrafluoropropene; and
optionally at least one of a compatibilizer, a surfactant, and a solubilizing agent.
3. The composition as claimed in claim 2, wherein the lubricant is based on the at least one polyol ester, and wherein the at least one polyol ester is obtained from a polyol which has a neopentyl backbone.
4. The composition as claimed in claim 1, wherein the lubricant is based on the at least one polyol ester, and wherein the at least one polyol ester is obtained from linear or branched carboxylic acid having from 2 to 15 carbon atoms.
5. The composition as claimed in claim 1, wherein the lubricant is based on the at least one polyol ester, and wherein the at least one polyol ester represents between 10% and 50% by weight of the composition.
6. (canceled)
7. A composition consisting of:
at least one lubricant based on at least one polyol ester or at least one polyvinyl ether;
a refrigerant consisting of at least one hydrofluoropropene, wherein the at least one hydrofluoropropene includes 3,3,3-trifluoropropene; and
optionally at least one of a compatibilizer, a surfactant, and a solubilizing agent.
8. The composition as claimed in claim 7, wherein the at least one hydrofluoropropene further includes at least one of 2,3,3,3-tetrafluoropropene and trans-1,3,3,3-tetrafluoropropene.
9. The composition as claimed in claim 7, wherein the at least one hydrofluoropropene further includes 2,3,3,3-tetrafluoropropene and trans-1,3,3,3-tetrafluoropropene.
10. The composition as claimed in claim 2, wherein the at least one lubricant is based on the at least one polyol ester, and wherein the at least one polyol ester is obtained from linear or branched carboxylic acid having from 2 to 15 carbon atoms.
11. The composition as claimed in claim 2, wherein the at least one lubricant is based on the at least one polyol ester, and wherein the at least one polyol ester represents between 10% and 50% by weight of the composition.
12. The composition as claimed in claim 3, wherein the polyol which has the neopentyl backbone is selected from the group consisting of neopentyl glycol, trimethylol propane, and dipentaerythritol.
13. The composition as claimed in claim 2, wherein the lubricant is based on the at least one polyol ester, and wherein the at least one polyol ester is a pentaerythritol ester.
14. The composition as claimed in claim 2, wherein the at least one lubricant is based on at least one polyvinyl ether.
15. The composition as claimed in claim 7, wherein the at least one lubricant is based on the at least one polyol ester, and wherein the at least one polyol ester is obtained from linear or branched carboxylic acid having from 2 to 15 carbon atoms.
16. The composition as claimed in claim 7, wherein the at least one lubricant is based on the at least one polyol ester, and wherein the at least one polyol ester represents between 10% and 50% by weight of the composition.
17. The composition as claimed in claim 7, wherein the at least one lubricant is based on the at least one polyol ester, and wherein the at least one polyol ester is obtained from a polyol having a neopentyl backbone.
18. The composition as claimed in claim 17, wherein the polyol having the neopentyl backbone is selected from the group consisting of neopentyl glycol, trimethylol propane, pentaerythritol, and dipentaerythritol.
19. The composition as claimed in claim 7, wherein the at least one lubricant is based on at least one polyvinyl ether.
20. The composition as claimed in claim 1, wherein the at least one lubricant is based on the at least one polyol ester obtained from a polyol having a neopentyl backbone, wherein the polyol having the neopentyl backbone is selected from the group consisting of neopentyl glycol, trimethylol propane, and dipentaerythritol.
21. The composition as claimed in claim 1, wherein the lubricant is based on the at least one polyol ester, and wherein the at least one polyol ester is a pentaerythritol ester.