Electro-spinning/writing system and corresponding method
A system for electro-spinning/writing of a polymer material, the system comprising a print-head configured to eject the polymer material via a nozzle, a collector configured to receive the polymer material ejected from the nozzle, a displacement assembly configured to adjust a distance between the print-head and the collector, and a vat containing or configured to contain a liquid, wherein the vat is further configured to receive the collector, wherein the displacement assembly is configured to retract the collector and at least a part of the polymer material received by the collector into the liquid in the vat in accordance with a height of the received polymer material.
1 . A system, the system comprising:
a print-head configured to eject the polymer material via a nozzle;
a collector configured to receive the polymer material ejected from the nozzle;
a displacement assembly configured to adjust a distance between the print-head and the collector; and
a vat containing or configured to contain a liquid, wherein the vat is further configured to receive the collector; and
wherein
the system is configured to electro-spin/write a polymer material, and
wherein the displacement assembly is configured to:
retract the collector and at least a part of the polymer material received by the collector into the liquid in the vat in accordance with a height of the received polymer material during a deposition of the polymer material on the collector, and
maintain an upper surface of the received polymer material facing the print-head at a target deposition distance above the liquid surface of the liquid during the deposition of the polymer material as the received polymer material on the collector is partially immersed into the liquid, such that a distance between the liquid surface and the nozzle is larger than the target deposition distance.
2 . The system of claim 1 , wherein the system further comprises a heater configured to melt polymer material to form a polymer melt to be ejected through the nozzle.
3 . The system of claim 1 , wherein the system further comprises a voltage source configured to apply a selectable electric potential to one or both of the print-head and the collector.
4 . The system of claim 3 , wherein the collector is grounded, and wherein the nozzle is configured to be held at a selectable electric potential, wherein the selectable electric potential is suitable for controlling a flow of polymer material from the print-head towards the collector.
5 . The system of claim 1 , wherein the system further comprises a control system configured to control the displacement assembly such as to retract the collector further into the vat while the height of the received polymer material increases.
6 . The system of claim 5 , wherein the control system is configured to control the displacement assembly to immerse the collector into the liquid when the deposition height exceeds a height threshold.
7 . The system of claim 1 , wherein the collector comprises a collector plate facing the print-head and a movable support protruding through an opening in a bottom of the vat, wherein the displacement assembly is configured to move the movable support through the opening to adjust a relative position of the collector with respect to the print-head.
8 . The system of claim 1 , wherein the vat comprises a level control unit for maintaining a constant filling height of the vat holding the liquid while the collector is retracted into the vat.
9 . The system of claim 1 , wherein the liquid is a dielectric medium, wherein a dielectric constant of the dielectric medium is smaller than 30.
10 . The system of claim 1 , wherein the liquid is conductive and one or both of the vat and the collector is grounded to maintain a constant electric potential of the liquid.
11 . The system of claim 5 , wherein a retraction distance of the collector into the vat is proportional to the height of the received polymer material.
12 . The system of claim 8 , wherein the level control unit is an overflow.
13 . The system of claim 3 , wherein a voltage is applied between the collector and the print-head, wherein the voltage is suitable for controlling a flow of polymer material from the print-head towards the collector.