US 11,987,435 B2
Gas discharge valve for packaging material
Yoon Sub Soh, Yongin-si (KR)
Appl. No. 17/605,112
Filed by Yoon Sub Soh, Yongin-si (KR)
PCT Filed Apr. 17, 2020, PCT No. PCT/KR2020/005190
§ 371(c)(1), (2) Date Oct. 20, 2021,
PCT Pub. No. WO2020/246704, PCT Pub. Date Dec. 10, 2020.
Claims priority of application No. 10-2019-0065640 (KR), filed on Jun. 3, 2019.
Prior Publication US 2022/0204238 A1, Jun. 30, 2022
Int. Cl. B65D 77/22 (2006.01); B32B 7/12 (2006.01); B32B 37/12 (2006.01)
CPC B65D 77/225 (2013.01) [B32B 7/12 (2013.01); B32B 37/12 (2013.01); B32B 2439/70 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A gas discharge valve for a packaging material, the gas discharge valve attached to an upper surface of a packing material in a manner that covers a through-hole formed in one side of the packing material and configured to discharge to an outside thereof only gas within the packing material within which contents are accommodated, the gas discharge valve comprising:
a high-adhesiveness layer attached directly to an external surface of the packing material and
adhered in a lengthwise direction to a portion of the external surface of the packing material in a vicinity of the through-hole; and
a low-adhesiveness layer formed inside the high-adhesiveness layer and adhered in such a manner to cover a top opening of the through-hole,
wherein, when gas occurs within the packing material in a state where the high-adhesiveness is adhered to the packing material, the low-adhesiveness layer is inflated by pressure, a portion thereof is raised, and the gas is discharged, and when the pressure is released, the low-adhesiveness layer returns to an original state thereof, the through-hole is sealed, and outside air is blocked from being introduced,
wherein the low-adhesiveness layer is formed of resin with self-adhesiveness that is selected from one of low-density PE (polyethylene), metallocene, EVA (ethylene vinyl acetate), PB (polybutylene), EMA (ethylene methyl acrylate), EAA (ethylene acrylic acid), EMAA (ethylene methacrylic acid), and EMMA (ethylene methyl methacrylate), and
wherein the low-adhesiveness layer formed of the resin with self-adhesiveness that is selected from one of low-density PE, metallocene, EVA, PB, EMA, EAA, EMAA, and EMMA further includes a silicone thin film on a surface thereof.