Evaluation of Mechanical Properties of Molding Materials Recycled Using Film Packaging Wastes

폐필름 포장재 재활용 성형재료의 역학적 특성 평가

Abstract

The present study examined the various strength and deformation performances of molding materials recycled using film packaging wastes to ascertain the their applicability to secondary products in construction industries. The stress-strain relationships of molding materials were measured under compression, tension, and flexure in accordance with the ASTM procedure. The measured mechanical properties of recycled molding materials were comparable to typical ranges observed in low-density polyethylene and/or high-density polyethylene. However, to stabilize the properties of the molding materials, further management systems are required as follows: 1) evaluation of mechanical properties of materials with respect to various mixing proportions of waste ingredients; 2) estimation of the effect of foreign substance and moisture contents on the mechanical properties; and 3) establishment of comprehensive database including various sources such as manufacture process including applied pressure to produce the molding materials, and collection region and time of wastes.

이 연구의 목적은 폐필름 포장재 재활용 성형재의 압축, 인장 및 휨 강도와 변형 특성을 생산 공장에 따라 측정하여 건설 2차제품의 적용 타당성을 평가하는 것이다. 재활용 성형재의 역학적 성능은 저밀도 폴리에틸렌 및 고밀도 폴리에틸렌의 일반적 값 수준으로 있지만 성능의 편차를 줄이고 품질의 안정화를 위해서는 1) 구성재료들의 혼합비율에 따른 재료 성능 평가; 2) 이물질 및 수분 함유량에 따른 재료성능 평가; 3) 다양한 제조 조건(제조공정, 가력 압력 및 폐필름 수거지역과 시기)에 대한 재료성능의 데이터베이스 관리 등의 현장 관리 체계마련이 요구되었다.

Fig. 1. Typical process for producing molding materials recycled using film packaging wastes

Fig. 2. Typical stress-strain curve in compression

Fig. 3. Typical stress-strain curve in tension

Fig. 4. Typical stress-strain curve in flexure

Fig. 5. Comparison of compressive strength between the present tests and LDPE, HDPE, and precast concrete

Fig. 6. Comparison of modulus of elasticity in compression between the present tests and LDPE, HDPE, and precast concrete

Fig. 7. Comparison of tensile strength between the present tests and LDPE, HDPE, and precast concrete

Fig. 8. Comparison of modulus of elasticity in tension between the present tests and LDPE, HDPE, and precast concrete

Fig. 9. Comparison of flexural strength between the present tests and LDPE, HDPE, and precast concrete

Fig. 10. Comparison of modulus of elasticity in flexure between the present tests and LDPE, HDPE, and precast concrete

Table 1. Test specimen

Table 2. Test results in compression

Table 3. Test results in tension

Table 4. Test results in flexure

Table 5. Typical mechanical properties(in MPa) of LDPE, HDPE and pre-cast concrete(PC)