US 12,185,751 B2
Smoke component-reducing cigarette filter, cigarette, and manufacturing method therefor
Soo Ho Kim, Daejeon (KR); Jin Chul Yang, Daejeon (KR); Man Seok Seo, Daejeon (KR); Jong Yeol Kim, Daejeon (KR); Youn Keun Oh, Sejong (KR); Tae Hoon Kim, Seoul (KR); and Moon Soo Yoon, Seoul (KR)
Assigned to KT&G CORPORATION, Daejeon (KR)
Appl. No. 17/251,526
Filed by KT&G CORPORATION, Daejeon (KR)
PCT Filed Jul. 3, 2019, PCT No. PCT/KR2019/008160
§ 371(c)(1), (2) Date Dec. 11, 2020,
PCT Pub. No. WO2020/009479, PCT Pub. Date Jan. 9, 2020.
Claims priority of application No. 10-2018-0079037 (KR), filed on Jul. 6, 2018.
Prior Publication US 2021/0244086 A1, Aug. 12, 2021
Int. Cl. A24D 3/02 (2006.01); A24D 3/04 (2006.01)
CPC A24D 3/0287 (2013.01) [A24D 3/04 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A cigarette filter comprising:
a first cylindrical filter, which is a multi-layered roll of a single polymer sheet, and
a first cigarette filter wrapping paper surrounding the first cylindrical filter,
wherein the polymer sheet comprises
a first polymer layer comprising polyolefin or polyester, and
a second polymer layer comprising polyolefin, the second polymer layer being positioned on the first polymer layer, and
wherein the first cylindrical filter comprises:
a core portion, and
an outer portion wrapping around the core portion in a cross-sectional view of the first cylindrical filter,
the first polymer layer in the core portion that is folded to contact another section of the first polymer layer in the core portion, and the second polymer layer in the core portion that is folded to contact another section of the second polymer layer in the core portion, and
the first polymer layer and the second polymer layer alternate in an orderly manner in the outer portion.