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US 2017/0282555 A1Published application
High viscosity jetting method
AssigneeAgfa Graphics NV
InventorsStefaan DE MEUTTER, David TILEMANS, Jaroslav KATONA
Life of this patent
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Abstract
A high viscosity jetting method includes jetting a liquid by a valvejet printhead through a nozzle in a nozzle plate, wherein a section of a nozzle has a shape including an outer edge with a minimum covering circle, wherein the maximum distance from the outer edge to the centre of the minimum covering circle is greater than the minimum distance from the outer edge to the centre from the minimum covering circle times 1.2, and wherein the jetting viscosity of the liquid is at least 20 mPa·s.
Claims16
1-10. (canceled)
11:
- A method for jetting a liquid comprising the steps of:
- providing a valvejet printhead including a nozzle having a shape including an outer edge within a minimum covering circle;
- a maximum distance from the outer edge to a center of the minimum covering circle being greater than or equal to a minimum distance from the outer edge to the center of the minimum covering circle times 1.2;
- and
- jetting the liquid through the nozzle at a viscosity from 20 mPa·s to 3000 mPa·s.
2 more elements
12:
- The jetting method according to claim 11, wherein the shape of the nozzle includes a set of axes of symmetry through the center of the minimum covering circle.
13:
- The jetting method according to claim 11, wherein the shape of the nozzle is:
- an ellipse, an approximate ellipse, a rectangle, an approximate rectangle, a rounded rectangle, a substantially rounded rectangle, a rectellipse, an approximate rectellipse, a semicircle, an approximate semicircle, a stadium, an approximate stadium, an oval, or an approximate oval;
- a shape defined by a formula of an epicycloid;
- or
- a shape defined by a formula:
- r
-
- (
- θ
- )
- =
- [
-
- cos
-
- (
- 1
- 4
-
- m
-
-
- θ
- )
- a
-
- n
-
-
- 2
- +
-
- sin
-
- (
- 1
- 4
-
- m
-
-
- θ
- )
- b
-
- n
-
-
- 3
- ]
- -
- 1
- /
- n
-
-
- 1
- .
55 more elements
14:
- The jetting method according to claim 11, further comprising the step of:
- recirculating the liquid through the valvejet printhead.
15:
- The jetting method according to claim 11, wherein the liquid is an inkjet ink including metallic particles or inorganic particles.
16:
- The jetting method according to claim 11, wherein a jetting temperature of the liquid is between 10° C. and 100° C.
17:
- The jetting method according to claim 16, wherein the jetting temperature of the liquid is between 20° C. and 60° C.
18:
- The jetting method according to claim 11, wherein a minimal dispensing volume of the valvejet printhead is from 1 nL to 500 μL.
19:
- A valvejet printhead for jetting a liquid having a jetting viscosity of 20 mPa·s to 3000 mPa·s, the valvejet printhead comprising:
- a nozzle having a shape including an outer edge within a minimum covering circle, a maximum distance from the outer edge to a center of the minimum covering circle being greater than or equal to a minimum distance from the outer edge to the center of the minimum covering circle times 1.2.
20:
- The valvejet printhead according to claim 19, wherein shape of the nozzle is defined by a formula:
- r
-
- (
- θ
- )
- =
- [
-
- cos
-
- (
- 1
- 4
-
- m
-
-
- θ
- )
- a
-
- n
-
-
- 2
- +
-
- sin
-
- (
- 1
- 4
-
- m
-
-
- θ
- )
- b
-
- n
-
-
- 3
- ]
- -
- 1
- /
- n
-
-
- 1
- .
51 more elements
21:
- The valvejet printhead according to claim 19, wherein the valvejet printhead is a throughflow valvejet printhead.
22:
- The valvejet printhead according to claim 19, wherein a minimum dispensing volume of the valvejet printhead is from 1 nL to 500 μL.
23:
- The valvejet printhead according to claim 19, wherein a native print resolution of the valvejet printhead is from 10 dots per inch to 300 dots per inch;
- or
- a nozzle diameter is from 45 μm to 600 μm.
24:
- The valvejet printhead according to claim 19, wherein the valvejet printhead has a maximum dispensing frequency up to 3000 Hz.
25:
- An inkjet printer comprising:
- the valvejet printhead according to claim 19.