Molded plastic objects having an integrated heat spreader and methods of manufacture of same

Patent metadata

Field	Value
Publication number	US-9863711-B2
Application number	US-201615244602-A
Country	US
Kind code	B2
Filing date	Aug 23, 2016
Priority date	Dec 23, 2013
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

Embodiments are directed to a molded plastic object that includes at least one vapor chamber within the plastic object. A wicking material is in contact with at least a portion of an inner wall of the vapor chamber. A working fluid located within the vapor chamber is configured to distribute heat from warmer regions of the plastic object to cooler regions of the plastic object. In some embodiments, the molded plastic object is part or all of a solid inkjet printhead.

First claim

What is claimed is:

1. A method of making a molded plastic object comprising:
introducing a molten polymer into a mold, the mold comprising:
at least one vapor chamber having an inner wall; and
a wicking material in contact with at least a portion of the inner wall of the vapor chamber;

cooling the molten polymer and removing it from the mold; and
filling the vapor chamber with working fluid configured to distribute heat from warmer regions of the plastic object to cooler regions of the plastic object, wherein the molded plastic object is a solid phase-change inkjet printhead for ink that changes phase from a solid to a liquid.

2. A method according to claim 1 , wherein the wicking material comprises a polymeric foam.

3. A method of making a molded plastic according to claim 2 further comprising:
applying a vacuum to the vapor chamber; and
sealing the vapor chamber under compression.

4. A method according to claim 1 , wherein the mold comprises a cavity for the wicking material.

5. A method according to claim 1 , wherein the molded plastic object is an inkjet printhead.

6. A method according to claim 1 , wherein introducing a molten polymer comprises injection molding.

7. A method according to claim 6 , wherein the wicking material is added to the cavity using reactive injection molding.

8. A method according to claim 6 , wherein the molded plastic object is made using one injection step.

9. A method of making a molded plastic object comprising:
particle composite injecting a molten polymer into a mold, the mold comprising:
at least one vapor chamber having an inner wall; and
a wicking material in contact with at least a portion of the inner wall of the vapor chamber;

cooling the molten polymer and removing it from the mold; and

filling the vapor chamber with working fluid configured to distribute heat from warmer regions of the plastic object to cooler regions of the plastic object.

10. A method of dissipating heat comprising:
molding a plastic object configured to distribute heat from warmer regions of the plastic object to cooler regions of the plastic object, the plastic object comprising:
at least one vapor chamber within the plastic object having an inner wall;
a wicking material in contact with at least a portion of the inner wall of the vapor chamber; and
a working fluid within the vapor chamber, the wicking material, or both, configured to distribute heat from warmer regions of the plastic object to cooler regions of the plastic object;

locating the plastic object in proximity to a heat source; and
dissipating heat from the heat source to the plastic object, wherein the molded plastic object is a solid phase-change inkjet printhead for ink that changes phase from a solid to a liquid.

11. A method according to claim 10 , wherein the heat source comprises a heater for solid ink in an inkjet printhead.

12. A method according to claim 10 , wherein the heat source comprises a hot engine block.

13. A method according to claim 10 , wherein the heat source comprises an electronic device.

Assignees

• Palo Alto Res Ct Inc

Inventors

• Paschkewitz John S
• Johnson David M

Classifications

• Y10T29/49353

  Heat pipe device making · CPC title

• B41J29/377 Primary

  Cooling or ventilating arrangements · CPC title

• B29L2031/757

  Moulds, cores, dies · CPC title

• B29L2031/18

  Heat-exchangers or parts thereof · CPC title

• B29K2995/0013

  Conductive · CPC title