To provide a foamed sheet having moderate strength without impairing the original flexibility of the foamed sheet.
The foamed sheet is formed by at least laminating a back film 3 sealing opening parts of protrusions 20, on a cap film 2 which is hollowly swollen and where the plurality of the circularly opened protrusions 20 of the same shape are formed in regular arrangement, wherein respective angles of three corners of a triangle OaObOc formed by connecting centers Oa, Ob, Oc, of three optionally selected adjacent protrusions 20a, 20b, 20c are set to 60±2.5°, and while keeping mutual positional relationship to form an equilateral triangle by the triangle OaObOc, the respective protrusions 20 are arranged to satisfy a relation of 1.05D≤P≤1.15D between P and D, wherein P is the length of the respective sides of the triangle OaObOc, and D is an outer diameter of a base part of the protrusions 20.
| JP2008018653A | 2008-01-31 | |||
| JPH11129366A | 1999-05-18 | |||
| JP2002059499A | 2002-02-26 | |||
| JP2004034594A | 2004-02-05 | |||
| JP2004098544A | 2004-04-02 | |||
| JP2000167954A | 2000-06-20 | |||
| JPH11192428A | 1999-07-21 | |||
| JP2000296571A | 2000-10-24 | |||
| JP2010120225A | 2010-06-03 | |||
| JP2010120668A | 2010-06-03 |
Okano Isao
Shinichi Nakayama