1. A method for fabricating an ink jet printer head, comprising the steps of:
forming electrodes on surfaces of plural grooves, the plural grooves being formed in a piezoelectric member of a substrate;
disposing a top plate above the plural grooves and on support walls each formed between the adjacent grooves to define pressure chambers and a common ink chamber;
cutting off an end face side of the substrate in which an end face is located on an open side of the grooves;
brushing a resulting cut section of the substrate with a rotating brush to remove burrs of the electrodes; and
attaching a plate to the cut section of the substrate, the plate being formed with a plurality of orifices for the ejection of ink which orifices correspond respectively to the grooves.
2. An ink jet printer head fabricating method according to claim 1, wherein the step of removing the burrs comprises performing the brushing in a contacted state of the brush with the cut section of the substrate located on the open side of the grooves and while setting the an amount of the brush pressed against the cut section of the substrate at a value of not larger than 2.0 mm.
3. An ink jet printer head fabricating method according to claim 1, wherein the step of removing the burrs comprises performing the brushing in a contacted state of the brush with the cut section of the substrate located on the open side of the grooves and while setting an amount of the brush pressed against the cut section of the substrate at a value of not larger than 1.0 mm.
4. An ink jet printer head fabricating method according to claim 1, wherein the step of forming the electrodes is carried out by an electroless plating method using a wet process.
5. An ink jet printer head fabricating method according to claim 1, wherein the step of forming the electrodes is carried out by a sputtering method using a dry process.
6. An ink jet printer head fabricating method according to claim 1, wherein the step of forming the electrodes not only forms the electrodes but also forms wiring patterns on a surface of the substrate.
7. An ink jet printer head fabricating method according to claim 1, further comprising the steps of:
before the step of forming the electrodes, bonding two plate-like piezoelectric members together which are polarized in their thickness direction, the bonding being performed so that the two piezoelectric members are opposite to each other in their polarizing direction, to form the substrate; and
after the step of forming the substrate and before the step of forming the electrodes, subjecting the substrate to a grinding work to form the plural grooves and support walls on a surface of the substrate, the grooves having a depth extending from a surface of one of the piezoelectric members and reaching an interior of the other of the two piezoelectric members.
8. The method of claim 1, wherein the rotating brush is a dry brush.
9. A method for fabricating an ink jet printer head, comprising:
forming an electrode on a surface of a groove, the groove being formed in a piezoelectric member of a substrate;
placing a top plate above the groove on a support wall to define a pressure chamber and a common ink chamber;
cutting a cut on an end face side of the substrate on an open side of the groove;
brushing the cut with a dry brush to remove a burr in the cut; and
attaching a plate to the cut section of the substrate, the plate having an orifice corresponding to the groove for ink ejection.
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 device for producing a product gas from a fuel, such as biomass, comprising a reactor which is delimited by a base and reactor walls, which reactor walls comprise a peripheral wall and an upper wall, which reactor comprises:
a supply opening for the supplying of fuel,
at least one riser for chemically converting the fuel supplied to at least a product gas, which riser is provided inside the peripheral wall and comprises an upper end and a lower end, as well as
a discharge opening for the discharging of the product gas,
in which the riser is attached to at least one reactor wall, and the lower end of the riser is at a distance above at least one section of the base which is underneath it and is freely movable under the effect of thermal expansion,
in which the reactor is provided with a positioning member for positioning the lower end of the riser.
2. The device as claimed in claim 1, in which the upper end of the riser is attached to at least one reactor wall.
3. The device as claimed in claim 1, in which the upper end of the riser is attached by a partition wall to the peripheral wall of the reactor, and in which the interior of the reactor comprises a separation chamber and a combustion chamber, which are separated from one another in a substantially gas-tight manner by the partition wall.
4. The device as claimed in claim 1, in which the reactor comprises a fluidizable bed of granular material, which is arranged on the base of the reactor, and in which the lower end of the riser extends into the fluidizable bed.
5. The device as claimed in claim 1, in which at least one nozzle for injecting a fluidizing fluid is provided in or under the riser.
6. The device as claimed in claim 1, in which the lower end of the riser is situated underneath the supply opening for supplying fuel.
7. The device as claimed in claim 1, in which the riser is open at its upper end, and in which the reactor comprises a separation chamber between the open upper end of the riser and the upper wall for separating gas and solid particles.
8. The device as claimed in claim 7, in which the reactor is provided with a combustion chamber which is connected to the separation chamber by at least one downcomer.
9. The device as claimed in claim 8, in which the riser is provided with a passage opening for allowing granular material to pass from the combustion chamber to the riser, the passage opening being arranged underneath the supply opening for the supplying of biomass.
10. The device as claimed in claim 8, in which the combustion chamber comprises several nozzles for supplying fluidizing air.
11. The device as claimed in claim 8, in which the riser and the downcomer form part of a frame which is suspended from at least one of the reactor walls of the reactor.
12. The device as claimed in claim 1, in which the positioning member is provided with a positioning tube which is aligned with respect to the riser, and in which the positioning tube and the riser are partially fitted inside one another.
13. The device as claimed in claim 12, in which an annular gap is formed between the positioning tube and the riser, and in which the radial distance of said gap is greater than 1 mm.
14. The device as claimed in claim 12, in which the base has a passage opening in which the positioning tube is fixed.
15. The device as claimed in claim 1, in which the discharge opening is arranged in the upper wall, which discharge opening is substantially aligned with respect to the open upper end of the riser.