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Metrics (View:262)- Life Cycle Assessment on Printed Circuit Board
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인쇄회로기판의 전과정평가
Published Online: Aug 31, 2000
요약문
C전자에서 제조되는 인쇄회로기판에 대하여 원료채취부터 제품생산까지의 cradle to gate 전과정평가를 수행하였다. 대 상제품은 유리섬유 및 에폭시 수지를 이용하여 HDD용으로 제조되는 4층 도체패턴의 PCB이다. 데이터는 현장 데이터를 적용하였으며, 현장 데이터 취득이 어려운 경우 데이터베이스를 사용하였다. 영향평가는 분류화, 특성화, 정규화 및 가중치부 여 단계로 수행되었으며, 고려된 영향범주는 ARD, GW, OD, POC, Acid, Eut, ET 및 HT이다. 불확실한 데이터 값의 변화가 전체 결과값에 미치는 변화정도를 알아보기 위하여 민감도 분석을 수행하였다.
LCA 수행 결과 PCB 제조공정은 OD 범주를 제외한 모든 영향범주에서 가장 큰 영향을 미치는 것으로 나타났다. 이는 PCB 제조시 사용된 전력에서 기인한 값이다. PCB 제조시 사용되는 화학약품은 질량기준 사용량은 많지만, 환경에 미치는 영향은 적은 것으로 나타났다. 사용된 데이터에 따른 민감도 분석 결과 PCB 제조공정의 전력사용량은 GW 및 POC 범주에 매우 민감하게 나타났으며, 할당방법에 의한 분석 결과 전 영향범주에서 25% 이내의 차이를 나타냈다.
Abstract
Life Cycle Assessment on Printed Circuit Board produced in C Electronics Co. was carried out. The system boundary encompasses raw material acquisition to the manufacturing of PCB(or cradle to gate). The product is FR4 PCB used for a component of HDD. FR is a mixture of glass fiber and epoxy resin. Generally site specific data were applied. However, database were used when it is hard to get site specific data. Impact assessment was carried out consecutively as classification, characterization, normalization and weighting. Considered Impact categories are ARD, GW, OD, POC, Acid, Eut, ET, HT. Sensitivity analysis is accomplished to find out how the variation of unreliable data affects the result of LCA.
The PCB manufacturing was identified as the most contributing activity to all impact categories except OD. This is mainly due to the electricity consumed in the manufacturing phase. Even though the large amount of chemicals are used for PCB manufacturing in mass, environment impact of those chemicals is much less than they were consumed. The sensitivity of data method shows that the amount of electricity consumed in the PCB manufacturing is considerably sensitive to POC and GW. The sensitivity results of allocation method in the PCB manufacturing on the LCA indicate approximately 25% difference in all impact categories.