US 12,308,213 B2
Core insertion type spiral tube and making method for the same
Hyun Seok Choi, Bucheon-si (KR); Sang Hyo Han, Suwon-si (KR); and Jeong Hyun Park, Suwon-si (KR)
Filed by SMT CORPORATION, Suwon-si (KR)
Filed on Aug. 23, 2022, as Appl. No. 17/893,202.
Claims priority of application No. 10-2021-0117405 (KR), filed on Sep. 3, 2021.
Prior Publication US 2023/0073639 A1, Mar. 9, 2023
Int. Cl. H01J 37/32 (2006.01); B32B 1/08 (2006.01); B32B 5/20 (2006.01); B32B 15/18 (2006.01); B32B 37/00 (2006.01)
CPC H01J 37/32477 (2013.01) [B32B 1/08 (2013.01); B32B 5/20 (2013.01); B32B 15/18 (2013.01); B32B 37/0076 (2013.01); H01J 37/32082 (2013.01); B32B 2255/06 (2013.01); B32B 2255/205 (2013.01); B32B 2266/0207 (2013.01); B32B 2311/00 (2013.01); B32B 2311/12 (2013.01); B32B 2311/30 (2013.01); B32B 2319/00 (2013.01); B32B 2457/00 (2013.01); H01J 2237/0203 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A manufacturing method for a core insertion type spiral tube, comprising:
a first step of processing an elastic core member in a line shape;
a second step of first foaming the elastic core member processed in the line shape;
a third step of inserting said first foamed elastic core member into an inner side of a spiral metal tube having an empty space therein; and
a fourth step of second foaming the elastic core member inserted into the inner side of said spiral metal tube.