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1. (WO2019005006) TWO-PART PLATFORM SEAL
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WHAT IS CLAIMED IS:

1. An apparatus, comprising:

a flexible film wiper attached to a platform and disposed on segments of a perimeter of the platform, the flexible film wiper extending beyond the perimeter to provide a sliding seal against corresponding walls of an enclosure of the platform;

a deformable member disposed upon the flexible film wiper and extending beyond the perimeter of the platform, the deformable member to apply sealing pressure to the flexible film wiper to increase a pressure of the sliding seal against the corresponding walls of the enclosure; and

clamping members disposed upon the deformable member, to apply a compressive force to the deformable member and the flexible film wiper, wherein the flexible film wiper and the deformable member provide a two-part seal between the platform and the enclosure.

2. The apparatus of claim 1, wherein the deformable member comprises corner elements to be in direct contact with corresponding corners of the enclosure, the corner elements being to provide sliding corner seals between corners of the platform and the corresponding corners of the enclosure.

3. The apparatus of claim 2, wherein the corner elements include strain relief notches to

mechanically isolate the corner elements from linear segments of the deformable member.

4. The apparatus of claim 1, wherein the flexible film wiper comprises a low-friction, non- compressible material.

5. The apparatus of claim 4, wherein the low-friction, non-compressible material comprises one of a polyimide, a PEK polymer, polytetrafluoroethylene, or an aliphatic or semi-aromatic polyamide.

6. The apparatus of claim 1, wherein the deformable material comprises one of silicone, a

flouroelastomer, or natural or synthetic rubber.

7. The apparatus of claim 1, wherein the platform comprises guide pins and threaded posts, wherein the flexible film wiper and the deformable member include apertures corresponding to the guide pins and the threaded posts, the apparatus further comprising clamping bars with apertures to accommodate the guide pins and the threaded posts, the clamping bars to provide clamping force to the deformable member and the flexible film wiper when nuts are threaded on the threaded posts.

8. A system, comprising:

a movable platform assembly, comprising:

a flexible film wiper attached to a rectangular platform and disposed on linear segments of a perimeter of the platform, the flexible film wiper extending beyond the perimeter;

a deformable member disposed upon the flexible film wiper and extending beyond the perimeter of the platform, the deformable member to apply sealing pressure to the flexible film wiper; and

clamping members disposed upon the deformable member, to apply a compressive force to the deformable member and the flexible film wiper; and

a fixed rectangular enclosure to accommodate the moving platform assembly, the flexible film wiper to provide a sliding seal against corresponding walls of the rectangular enclosure, wherein the flexible film wiper and the deformable member provide a two-part seal between the platform and the enclosure to define a build volume of a powder-based 3-D printer.

9. The system of claim 8, wherein the deformable member comprises corner elements to be in direct contact with corresponding corners of the rectangular enclosure, the corner elements to provide sliding corner seals between corners of the rectangular platform and the

corresponding corners of the rectangular enclosure.

10. The system of claim 9, wherein the corner elements include strain relief notches to

mechanically isolate the corner elements from linear segments of the deformable member.

11. The system of claim 10, wherein the flexible film wiper comprises a low-friction, non- compressible material.

12. The system of claim 11, wherein the low-friction, non-compressible material comprises one of a polyimide, a PEK polymer, polytetrafluoroethylene, or an aliphatic or semi-aromatic polyamide.

13. The system of claim 8, wherein the deformable material comprises one of silicone, a

flouroelastomer, or natural or synthetic rubber.

14. The system of claim 8, wherein the rectangular platform comprises guide pins and threaded posts, wherein the flexible film wiper and the deformable member include apertures

corresponding to the guide pins and the threaded posts, the apparatus further comprising clamping bars with apertures to accommodate the guide pins and the threaded posts, the clamping bars to provide clamping force to the deformable member and the flexible film wiper when nuts are threaded on the threaded posts.

15. A method, comprising:

providing a rectangular platform;

adding a flexible film wiper to the rectangular platform, disposed on linear segments of a perimeter of the platform, the flexible film wiper extending beyond the perimeter of the platform;

adding a deformable member disposed upon the flexible film wiper and extending beyond the perimeter of the platform;

clamping the flexible film wiper and the deformable member with clamping members disposed upon the deformable member, to apply a compressive force to the deformable member and the flexible film wiper; and

positioning the platform within a rectangular enclosure, wherein the flexible film wiper provides a sliding seal against corresponding walls of the rectangular enclosure, and wherein the deformable member applies sealing pressure to the flexible film wiper to increase a pressure of the sliding seal against the corresponding walls of the rectangular enclosure.