KR20170059914A - 발포 시트 - Google Patents
발포 시트 Download PDFInfo
- Publication number
- KR20170059914A KR20170059914A KR1020167010995A KR20167010995A KR20170059914A KR 20170059914 A KR20170059914 A KR 20170059914A KR 1020167010995 A KR1020167010995 A KR 1020167010995A KR 20167010995 A KR20167010995 A KR 20167010995A KR 20170059914 A KR20170059914 A KR 20170059914A
- Authority
- KR
- South Korea
- Prior art keywords
- foam
- foam sheet
- impact
- shock absorption
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
도 2는 진자형 충격 시험기(충격 시험 장치)의 유지 부재의 개략 구성을 나타낸 도면이다.
2 : 시험편(발포 시트)
3 : 유지 부재
4 : 충격 부하 부재
5 : 압력 센서
11 : 고정 지그
12 : 누름 지그
16 : 압력 조정 수단
20 : 지주
21 : 아암
22 : 지지봉(샤프트)의 일단
23 : 지지봉(샤프트)
24 : 충격자
25 : 전자석
28 : 지지판
a : 스윙업 각도
Claims (17)
- 평균 셀 직경이 10∼200 ㎛의 발포체로 구성되고, 80℃에서의 압축 영구 변형이 80% 이하이며, 하기에서 정의되는 충격 흡수 변화율이 ±20% 이하인 발포 시트:
충격 흡수 변화율(%)={(고온 압축후의 충격 흡수율 b - 초기의 충격 흡수율 a)/초기의 충격 흡수율 a}×100
초기의 충격 흡수율 a : 시험편 A의 충격 흡수율(%)
고온 압축후의 충격 흡수율 b(%) : 시험편 A의 초기 두께에 대하여 60% 압축한 상태로 시험편 A를 80℃×72시간 보존한 후 압축 상태를 해제하고, 그 후 23℃×24시간 경과후에 측정한 충격 흡수율(%)
충격 흡수율 : 진자형 충격 시험기를 이용한 충격 흡수성 시험(충격자의 무게 28 g, 스윙업 각도 40°)(23℃)에 있어서, 하기 식으로 정의되는 값
충격 흡수율(%)={(F0-F1)/F0}×100
(상기 식에 있어서, F0은 지지판에만 충격자를 충돌시켰을 때의 충격력을 말하고, F1은 지지판과 시험편 A로 이루어진 구조체의 지지판 위에 충격자를 충돌시켰을 때의 충격력을 말한다). - 제1항에 있어서, 두께가 30∼1000 ㎛이고, 상기 발포체의 겉보기 밀도가 0.2∼0.7 g/㎤인 발포 시트.
- 제1항 또는 제2항에 있어서, 상기 발포체가, 동적 점탄성 측정에 있어서의 각진동수 1 rad/s에서의 저장 탄성률과 손실 탄성률의 비율인 손실 탄젠트(tanδ)가 -30℃ 이상 30℃ 이하의 범위에 피크톱을 갖는 발포 시트.
- 제1항 내지 제3항 중 어느 한 항에 있어서, 발포체가, 아크릴계 폴리머, 고무, 우레탄계 폴리머 및 에틸렌-아세트산비닐 공중합체로 이루어진 군에서 선택된 적어도 1종의 수지 재료로 형성되어 있는 발포 시트.
- 제1항 내지 제4항 중 어느 한 항에 있어서, 발포체가, 에멀션 수지 조성물을 기계적으로 발포시키는 공정 A를 거쳐서 형성되는 발포 시트.
- 제5항에 있어서, 발포체가, 기계적으로 발포시킨 에멀션 수지 조성물을 기재 위에 도공하여 건조시키는 공정 B를 더 거쳐서 형성되는 발포 시트.
- 제6항에 있어서, 상기 공정 B가, 기재 위에 도포한 기포 함유 에멀션 수지 조성물을 50℃ 이상 125℃ 미만에서 건조시키는 예비 건조 공정 B1과, 그 후 125℃ 이상 200℃ 이하에서 더 건조시키는 본건조 공정 B2를 포함하고 있는 발포 시트.
- 제1항 내지 제7항 중 어느 한 항에 있어서, 상기 80℃에서의 압축 영구 변형이 50% 이하인 발포 시트.
- 제8항에 있어서, 상기 80℃에서의 압축 영구 변형이 25% 이하인 발포 시트.
- 제2항 내지 제9항 중 어느 한 항에 있어서, 두께가 40∼500 ㎛인 발포 시트.
- 제10항에 있어서, 두께가 50∼300 ㎛인 발포 시트.
- 제2항 내지 제11항 중 어느 한 항에 있어서, 상기 발포체의 겉보기 밀도가 0.21∼0.6 g/㎤인 발포 시트.
- 제12항에 있어서, 상기 발포체의 겉보기 밀도가 0.22∼0.5 g/㎤인 발포 시트.
- 제1항 내지 제13항 중 어느 한 항에 있어서, 발포체의 한면 또는 양면에 점착제층을 갖는 발포 시트.
- 제1항 내지 제14항 중 어느 한 항에 있어서, 전기ㆍ전자 기기용 충격 흡수 시트로서 이용되는 발포 시트.
- 제1항 내지 제15항 중 어느 한 항에 기재된 발포 시트가 이용되고 있는 전기ㆍ전자 기기.
- 제16항에 있어서, 표시 부재를 구비한 전기ㆍ전자 기기로서, 제1항 내지 제14항 중 어느 한 항에 기재된 발포 시트가 그 전기 또는 전자 기기의 케이스와 상기 표시 부재 사이에 끼워진 구조를 갖는 전기ㆍ전자 기기.
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| JP6082498B2 (ja) | 2017-02-15 |
| CN111690165A (zh) | 2020-09-22 |
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| KR20170058882A (ko) | 2017-05-29 |
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| CN105745262A (zh) | 2016-07-06 |
| KR102454590B1 (ko) | 2022-10-13 |
| JP6785156B2 (ja) | 2020-11-18 |
| CN105745262B (zh) | 2020-01-07 |
| US20160304680A1 (en) | 2016-10-20 |
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| KR102441216B1 (ko) | 2022-09-06 |
| JPWO2016047611A1 (ja) | 2017-07-06 |
| JP7001790B2 (ja) | 2022-02-10 |
| KR20170063530A (ko) | 2017-06-08 |
| JPWO2016047612A1 (ja) | 2017-04-27 |
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