Stretchable substrate having improved stretch uniformity and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-11968778-B2
Application number	US-202217703520-A
Country	US
Kind code	B2
Filing date	Mar 24, 2022
Priority date	Dec 31, 2021
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

Disclosed is a method of manufacturing a stretchable substrate having improved stretch uniformity according to various embodiments of the present disclosure in order to implement the above-described object. The method may include forming an auxetic including a plurality of unit structures, and attaching one or more elastic sheets to the auxetic and forming a stretchable substrate.

First claim

What is claimed is:

1. A method of manufacturing a stretchable substrate having improved stretch uniformity, the method comprising:
forming an auxetic including a plurality of unit structures; and
attaching one or more elastic sheets to the auxetic and forming a stretchable substrate,
wherein the forming of the auxetic includes forming the auxetic which includes the plurality of unit structures having a shape corresponding to a chiral structure,
wherein the forming of the stretchable substrate includes:
filling a plurality of central holes related to central portions of the plurality of unit structures with elastic bodies; and
attaching the one or more elastic sheets to an elastic body corresponding to each of the central holes to form the stretchable substrate, and
wherein:
the one or more elastic sheets include a first elastic sheet attached to a first surface of the auxetic and a second elastic sheet attached to a second surface opposite to the first surface;
the forming of the stretchable substrate includes applying a lubricant on an inner peripheral surface of the central hole, bringing the first elastic sheet into contact with the first surface, filling each of the plurality of central holes with the elastic body in a downward direction of the second surface and curing each of the elastic bodies and the first elastic sheet, and bringing the second elastic sheet into contact with the second surface and curing each of the elastic bodies and the second elastic sheet; and
the lubricant is provided between the unit structure and the elastic body.

2. The method of claim 1 , wherein, in response to an external force generated in one axial direction, each of the plurality of unit structures causes deformation of the auxetic in another axial direction.

3. The method of claim 1 , wherein the forming of the auxetic includes performing a printing process using an elastic material.

4. The method of claim 1 , wherein the elastic body includes an elastic material having an elastic force and is made of the same material as the elastic sheet.

5. A method of manufacturing a stretchable substrate having improved stretch uniformity, the method comprising:
forming an auxetic including a plurality of unit structures; and
attaching one or more elastic sheets to the auxetic and forming a stretchable substrate,
wherein the forming of the auxetic includes forming the auxetic which includes the plurality of unit structures having a shape corresponding to a chiral structure,
wherein the forming of the stretchable substrate includes:
filling a plurality of central holes related to central portions of the plurality of unit structures with elastic bodies; and
attaching the one or more elastic sheets to an elastic body corresponding to each of the central holes to form the stretchable substrate, and
wherein:
the one or more elastic sheets include a first elastic sheet attached to a first surface of the auxetic and a second elastic sheet attached to a second surface opposite to the first surface;
the forming of the stretchable substrate includes forming a protective frame on an inner peripheral surface of the central hole, bringing the first elastic sheet into contact with the first surface, filling each of the plurality of central holes with the elastic body in a downward direction of the second surface and curing each of the elastic bodies and the first elastic sheet, removing the protective frame, and bringing the second elastic sheet into contact with the second surface and curing the elastic body and the second elastic sheet; and
an air gap based on the protective frame is formed between the unit structure and the elastic body.

6. The method of claim 5 , wherein:
the protective frame is made using a solute that is dissolved in a solvent; and
the removing of the protective frame includes supplying the solvent to remove the protective frame.

7. The method of claim 5 , wherein the air gap allows the elastic body and the auxetic to be deformed independently from each other in response to stretching in various axial directions.

Assignees

• Korea Inst Sci & Tech

Inventors

• Lee Phillip
• Chung Seungjun
• Kim Heesuk
• Son Jeonggon
• Hwang Sukjoon

Classifications

• H05K1/0283 Primary

  Stretchable printed circuits · CPC title

• H05K3/00

  Apparatus or processes for manufacturing printed circuits · CPC title

• H05K2201/09063

  Holes or slots in insulating substrate not used for electrical connections · CPC title

• H05K1/036

  Multilayers with layers of different types · CPC title

• H05K1/0393

  Flexible materials (H05K1/038 takes precedence; specific organic compositions are classified in H05K1/0313 and subgroups) · CPC title