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제1장 서 론 ··············································································································· 1
제2장 집성재의 산업현황 및 기술동향 ··································································· 7
2.1 국내 집성재 관련 산업 현황 ······················································································ 9
2.1.1 국내 동향 ····························································································································· 9
2.1.2 국내 집성재 산업현황 ······································································································· 10
2.1.3 집성재 수입실태 ················································································································ 11
2.1.4 집성재 유통실태 ················································································································ 12
2.1.5 생산량 및 시장규모 ·········································································································· 14
2.2 국외 동향 ··················································································································· 14
2.3 국내외 집성재 관련 품질 규격 및 제조 기준 ························································ 16
2.4 구조용 집성재의 접착제 기술개발 현황 ·································································· 18
2.5 목재의 유전특성 평가 기술 ······················································································ 19
2.6 집성재의 경제성 분석 기술동향 ··············································································· 20
제3장 목재 및 접착층 유전가열 기작 분석 ·························································· 21
3.1 집성재 구성요소의 상대유전특성 평가 ···································································· 23
3.1.1 유전체의 상대유전특성 ····································································································· 23
3.1.2 낙엽송의 방향별 상대유전특성 평가 ············································································· 27
3.1.3 낙엽송의 함수율별 상대유전특성 평가 ············································································ 30
3.1.4 페놀-레조시놀(PRF) 접착제의 상대유전특성 평가 ························································· 31
3.2 집성재 구성 요소의 열적 성질 평가 ······································································· 33
3.2.1 낙엽송과 접착제(PRF)의 밀도 측정 ················································································· 34
3.2.2 낙엽송과 접착제(PRF)의 비열 측정 ················································································· 35
3.2.3 국산 주요 침엽수종의 방향별 상대유전특성 평가 ························································· 37
3.2.4 PRF 접착제와 멜라민요소공축합수지의 상대유전특성 평가 ········································· 39
3.2.5 국산 주요 침엽수종의 열적 특성 ·················································································· 40
3.3 고주파에 의한 온도상승 이론적 분석 ····································································· 46
3.3.1 고주파 인가시 가열되는 목재와 접착제의 온도상승속도 비교 ····································· 46
3.3.2 시간 내 목표 온도에 도달하기 위한 주파수별 최소 전기장 세기 추산 ······················ 49
3.4 유전가열에 따른 집성재 내부 온도변화 예측 ························································· 51
제4장 고주파 가열 경화시스템에 적용이 가능한 고내수 열경화성 접착제 개발 ······ 55
4.1 멜라민·요소수지 합성 ····························································································· 57
4.1.1 이액형 멜라민·요소수지의 합성 ··················································································· 57
4.1.2 일액형 멜라민·요소수지 합성 ························································································ 58
4.2 수지물성평가 ·············································································································· 58
4.3 열경화거동 평가 ········································································································ 61
4.4 수지의 화학구조 분석 ······························································································· 63
4.5 합판 접착력 및 물성 측정 ····················································································· 66
4.6 일액형 멜라민 요소 공축합수지의 접착성능평가 ··················································· 72
4.7 일액형 MUF 접착제 고주파집성재의 접착층 내부 온도 ······································· 73
제5장 고주파 가열 압체시스템을 이용한 구조용 집성재 개발 ··························· 75
5.1 고주파 가열 경화에 적합한 접착제 탐색 ································································ 77
5.2 고주파 가열 경화를 위한 페놀 수지 적용 방법 모색 ··········································· 82
5.3 고주파 가열 압체시스템 설계 ·················································································· 85
5.3.1 고주파 주파수 대역 선정 ································································································· 85
5.3.2 집성재 생산 목표 단면 범위 ···························································································· 86
5.3.3 압체력 범위 ······················································································································· 86
5.3.4 전자파 안전확보 ················································································································ 87
5.3.5 고주파 가열 경화 시스템의 설계 ···················································································· 88
5.4 고주파 유전가열에 따른 집성재 내부 온도변화 측정 ············································ 88
5.4.1 고주파 인가시 가열되는 목재와 접착제의 온도상승속도 비교 ····································· 90
5.4.2 고주파 유전가열장치의 전기장 강도 결정 ······································································ 92
5.4.3 고주파 유전가열장치의 전기장 강도와 목재 가열시 전기장 강도의 결정 ··················· 96
5.4.4 고주파 가열에 의한 집성재의 표면온도변화 ·································································· 97
5.4.5 고주파 가열에 따른 집성재 내부의 접착층 온도 분포 측정 ······································· 101
5.5 고주파 가열을 위한 접착제 및 발진조건 탐색 ····················································· 102
5.5.1 고주파 가열을 위한 발진조건 탐색 ··················································································· 102
5.5.2 상온경화 접착제를 이용한 수종별 고주파 가열 집성 가능성 탐색 ································ 105
5.5.3 저가형 열경화성 수지를 이용한 고주파 가열 집성 가능성 탐색 ··································· 107
5.6 옹이에 의한 접착성능 영향분석 ···············································································112
5.7 등급구성에 따른 구조용 고주파집성재의 휨강도성능평가 ·····································113
5.7.1 층재의 등급구분 ················································································································113
5.7.2 접착제에 따른 고주파집성재의 휨강도 성능 비교 ·························································113
5.8 고주파가열경화시스템을 이용한 집성재의 내구성 평가 ·········································115
제6장 고주파 가열 시스템 도입에 따른 경제성 평가 ········································ 117
6.1 구조용 집성재 제조원가 분석 ················································································ 119
6.2 고주파 가열 제조 시스템에 대한 경제성 분석 ····················································· 122
6.2.1 편익비용분석 개요 ··········································································································· 122
6.2.2 경제성 평가기준 ·············································································································· 124
6.2.3 경제적 타당성 분석 기준의 비교 ··················································································· 126
6.2.4 분석의 전제 및 주요 가정 ····························································································· 127
6.2.5 비용 및 편익의 추정 ······································································································· 129
6.2.6 시나리오 설정 및 경제성 평가 ······················································································ 132
6.2.7 민감도 분석결과 ·············································································································· 142
6.3 실물옵션을 이용한 집성재 생산업체의 투자의사결정 분석 ································· 143
6.3.1 실물옵션모형에 대한 이론적 검토 ················································································· 143
6.3.2 분석에 이용된 자료 ········································································································· 153
6.3.3 분석결과 및 민감도 분석 ······························································································· 155
6.4 분석결과 및 정책제언 ····························································································· 158
제7장 맺음말 ·········································································································· 163
제8장 참고문헌 ······························································································ 167