Stretchable substrate having improved stretching deformation uniformity through control of spatial crosslinking degree and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-12311644-B2
Application number	US-202318467594-A
Country	US
Kind code	B2
Filing date	Sep 14, 2023
Priority date	Jul 21, 2023
Publication date	May 27, 2025
Grant date	May 27, 2025

Abstract

Provided is a method of manufacturing a stretchable substrate having improved stretching deformation uniformity through control of a spatial crosslinking degree according to various embodiments of the present disclosure to implement the above object. The method includes forming a substrate part of an elastic material, forming an auxetic including a plurality of unit structures on the substrate part, and forming a fixing part on the substrate part on which the auxetic is formed, wherein the fixing part has a different crosslinking density in each region.

First claim

What is claimed is:

1. A method of manufacturing a stretchable substrate having improved stretching deformation uniformity through control of a spatial crosslinking degree, the method comprising:
forming a substrate part of an elastic material;
forming an auxetic including a plurality of unit structures on the substrate part; and
forming a fixing part on the substrate part on which the auxetic is formed,
wherein the fixing part has a different crosslinking density in each region,
wherein the forming of the fixing part includes coating the substrate part, on which the auxetic is formed, with a filler in a liquid state, and performing curing.

2. The method of claim 1 , wherein the auxetic is provided to have a Young's modulus that is higher than a Young's modulus of the substrate part and a Young's modulus of the fixing part.

3. The method of claim 1 , wherein the filler includes a photocurable elastomer, and
the curing is performed through a different light irradiation pattern for each region.

4. The method of claim 1 , wherein the filler includes a thermosetting elastomer,
the forming of the fixing part includes providing a light absorption pattern layer in an upward direction from the substrate part,
the light absorption pattern layer has a different light absorption pattern for each region, and
the curing includes photocuring through uniform light radiation.

5. The method of claim 4 , wherein the light absorption pattern layer has a light absorption pattern in which light absorption increases in a direction away from a center.

6. The method of claim 1 , wherein the forming of the fixing part includes providing a plurality of light absorption structures each corresponding to one of a plurality of regions of the filler in the liquid state, and
radiating light through a different irradiation pattern for each region from above the filler including the plurality of light absorption structures,
wherein each of the plurality of light absorption structures is provided to correspond to one region and absorb the light.

7. The method of claim 1 , wherein the filler includes a thermosetting elastomer,
the forming of the fixing part includes providing a heat absorption pattern layer on one surface of the substrate part, and
providing a heating plate on another surface of the substrate part to supply heat,
wherein the heat absorption pattern layer has a different heat absorption pattern for each region, and
the curing includes thermal curing performed through supply of heat.

8. A stretchable substrate having improved stretching deformation uniformity through control of a spatial crosslinking degree, the stretchable substrate comprising:
a substrate part made of an elastic material;
an auxetic including a plurality of unit structures and formed on one surface of the substrate part; and
a fixing part configured to fix the auxetic,
wherein the fixing part has a different crosslinking density in each region,
wherein the fixing part is formed by coating the substrate part, on which the auxetic is formed, with a filler in a liquid state, and performing curing.

9. The stretchable substrate of claim 8 , wherein the auxetic is provided to have a Young's modulus that is higher than a Young's modulus of the substrate part and a Young's modulus of the fixing part.

10. The stretchable substrate of claim 8 , wherein the fixing part is formed by radiating light having a different irradiation pattern for each region from above the filler in the liquid state including a plurality of light absorption structures corresponding to each of a plurality of regions, and
each of the plurality of light absorption structures is provided to correspond to one region and absorb the light.

11. The stretchable substrate of claim 8 , wherein the filler includes a photocurable elastomer, and
the curing is performed through a different light irradiation pattern for each region.

12. The stretchable substrate of claim 8 , wherein the filler includes a thermosetting elastomer,
the fixing part is formed by curing the filler by radiating uniform light in a state in which a light absorption pattern layer is provided in an upward direction from the substrate part, and
the light absorption pattern layer has a different light absorption pattern for each region.

13. The stretchable substrate of claim 12 , wherein the light absorption pattern layer has a light absorption pattern in which light absorption increases in a direction away from a center.

14. The stretchable substrate of claim 12 , wherein the filler includes a thermosetting elastomer,
in a state in which a heat absorption pattern layer is disposed to correspond to a first surface of the fixing part, heat is supplied through a heating plate disposed to correspond to a second surface of the substrate part to perform thermal curing and form the fixing part, and
the heat absorption pattern layer has a different heat absorption pattern for each region.

Assignees

• Korea Inst Sci & Tech

Inventors

• Chung Seungjun
• Choi Jun Chan
• Jeong Hoon Yeub
• Son Jeong Gon
• Kim Heesuk
• Lee Phillip

Classifications

• B32B2307/51

  Elastic · CPC title

• B32B2310/0806

  using electromagnetic radiation · CPC title

• B32B2307/54

  Yield strength; Tensile strength · CPC title

• B32B2457/00

  Electrical equipment · CPC title

• B32B7/022

  Mechanical properties · CPC title