Double-sided imprinting

1. A double-sided imprinting method comprising:

drawing a first web along first rollers and drawing a second web along second rollers, the first web comprising a first template and the second web comprising a second template;

aligning reference marks on the first web and the second web, such that the first template and the second template are aligned with each other;

drawing the first web along the first rollers in a first direction to expose the first template to a first dispenser and drawing the second web along the second rollers in a second direction to expose the second template to a second dispenser;

dispensing a first resist on the first template by the first dispenser and dispensing a second resist on the second template by the second dispenser;

drawing the first web along the first rollers in a direction reverse to the first direction and drawing the second web along the second rollers in a direction reverse to the second direction, such that the first template with the first resist and the second template with the second resist face to each other;

inserting a substrate between the first template with the first resist and the second template with the second resist;

curing the first resist and the second resist, such that the cured first resist has a first imprinted feature associated with the first template on a first side of the substrate and the cured second resist has a second imprinted feature associated with the second template on a second side of the substrate; and

unloading the substrate with the first imprinted feature on the first side and the second imprinted feature on the second side.

2. The method of claim 1 , further comprising:

after the aligning, clamping the first web and the second web at a location adjacent to the reference marks, such that the clamped first web and second web are moved with the first template and the second template aligned with each other; and

after the curing, unclamping the first web and the second web, such that the substrate with the cured first resist and second resist is capable of passing through a gap between the first web and the second web.

3. The method of claim 2 , wherein clamping the first web and the second web comprises:

actuating a chuck with a clamp, such that the chuck is chucked onto the first web and the clamp is clamped onto the second web.

4. The method of claim 3 , wherein the chuck comprises a vacuum chuck configured to chuck onto the first web with vacuum.

5. The method of claim 3 , wherein the chuck is moveable, and

wherein the chuck and the clamp are moved together with the first web and the second web after the clamping.

6. The method of claim 5 , wherein the chuck is positioned on a pair of guides, and each guide of the pair of guides is movable on a respective rail connected to a frame.

7. The method of claim 6 , wherein aligning the reference marks on the first web and the second web comprises adjusting relative positions of the pair of guides on the respective rails in at least one of an x, y, or theta direction.

8. The method of claim 1 , wherein the first rollers and the second rollers are arranged such that, after the inserting, the substrate is moved together with the first template and the second template, and the first resist is pressed onto the first side of the substrate and filled into a first imprinting feature on the first template and the second resist is pressed onto the second side of the substrate and filled into a second imprinting feature on the second template, and

wherein the first imprinted feature on the first side of the substrate corresponds to the first imprinting feature on the first template, and the second imprinted feature on the second side of the substrate corresponds to the second imprinting feature on the second template.

9. The method of claim 1 , further comprising:

moving a first squeegee roller on the first web to push the first template into the first resist, such that the first resist fills into a first imprinting feature on the first template; and

moving a second squeegee roller on the second web to push the second template into the second resist, such that the second resist fills into a second imprinting feature on the second template,

wherein the first imprinted feature on the first side of the substrate corresponds to the first imprinting feature on the first template, and the second imprinted feature on the second side of the substrate corresponds to the second imprinting feature on the second template.

10. The method of claim 9 , wherein the first squeegee roller and the second squeegee roller are positioned opposite to each other when the first squeegee and the second squeegee are moved together.

11. The method of claim 1 , wherein aligning reference marks on the first web and the second web comprises aligning a first one of the reference marks on the first web with a second one of the reference marks on the second web and aligning a third one of the reference marks on the first web with a fourth one of the reference marks on the second web.

12. The method of claim 11 , further comprising:

after the reference marks on the first web and the second web are aligned, imprinting the substrate with a range of the first template defined by the first one of the reference marks and the third one of the reference marks.

13. The method of claim 1 , wherein aligning the reference marks on the first web and the second web comprises moving a z-roller of the first rollers in at least one of x, y, or theta direction.

14. The method of claim 1 , wherein aligning the reference marks on the first web and the second web comprises locating the reference marks by using at least one of a camera system or a laser system.

15. The method of claim 1 , wherein the first rollers comprise at least one air turn roller floating the first web with air pressure.

16. The method of claim 1 , wherein the first rollers comprise at least one air turn roller chucking the first web with vacuum.

17. The method of claim 1 , wherein the first direction is a counter-clockwise direction, and the second direction is a clockwise direction.

18. The method of claim 1 , wherein the first rollers comprise two first z-rollers arranged in a vertical direction, and the second rollers comprise two second z-rollers arranged in the vertical direction.

19. The method of claim 18 , wherein dispensing the first resist on the first template by the first dispenser comprises dispensing the first resist on the first template when the first template is in a horizontal direction, and

wherein dispensing the second resist on the second template by the second dispenser comprises dispensing the second resist on the second template when the second template is in the horizontal direction.

20. The method of claim 1 , wherein inserting the substrate comprises inserting the substrate by a first holder along an inserting direction, and

wherein unloading the substrate comprises one of:

moving the substrate with the first and second imprinted features along a direction reverse to the inserting direction and unloading the substrate with the first and second imprinted features by the first holder, and

moving the substrate with the first and second imprinted features along the inserting direction and unloading the substrate with the first and second imprinted features by a second, different holder.

21. The method of claim 1 , further comprising:

measuring a first tension of the first web by a first tension sensor; and

measuring a second tension of the second web by a second tension sensor.

22. The method of claim 1 , further comprising:

controlling a temperature of a chamber enclosing at least the first template and the second template.

23. The method of claim 1 , further comprising:

locating a first one of the reference marks on the first web using a detecting system positioned before one of the first rollers, the detecting system comprising at least a camera system or a laser system.

24. The method of claim 1 , further comprising:

locating a first one of the reference marks on the first web and a reference mark on the substrate;

aligning the first one of the reference marks on the first web with the reference mark on the substrate; and then

clamping the first web and moving the first web such that the first template is moved over the substrate.

25. The method of claim 1 , further comprising:

measuring an angle of the first web by one or more sensors arranged on an edge of the first web; and

repositioning the substrate based on the measured angle of the first web.