• 한국포장학회지
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• 제30권1호
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• pp.53-62
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• 2024

Molded pulp products has become more attractive than traditional materials such as expanded polystyrene foam (EPS) owing to low-priced recycled paper, environmental benefits such as biodegradability, and low production cost. In this study, various design factors regarding compression and cushioning characteristics of the molded pulp cushion with truncated pyramid-shaped structural units were analyzed using a test specimen with multiple structural units. The adopted structural factors were the geometric shape, wall thickness, and depth of the structural unit. The relative humidity was set at two levels. We derived the cushion curve model of the target molded pulp cushion using the stress-energy methodology. The coefficient of determination was approximately 0.8, which was lower than that for EPS (0.98). The cushioning performance of the molded pulp cushion was affected more by the structural factors of the structural unit than by the material characteristics. Repeated impacts, higher static stress, and drop height decreased the cushioning performance. Its compression behavior was investigated in four stages: elastic, first buckling, sub-buckling, and densification. It had greater rigidity during initial deformation stages; then, during plastic deformation, the rigidity was greatly reduced. The compression behavior was influenced by structural factors such as the geometric shape and depth of the structural unit and environmental conditions, rather than material properties. The biggest difference in the compression and cushioning characteristics of molded pulp cushion compared to EPS is that it is greatly affected by structural factors, and in addition, strength and resilience are expected to decrease due to humidity and repetitive loads, so future research is needed.

• 펄프종이기술
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• 제47권5호
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• pp.52-60
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• 2015

Static electricity is an imbalance of electric charges within or on the surface of a material. All packed items that are particularly sensitive to static discharge must be protected by antistatic treatment. Otherwise, static electricity generated by an electrical insulator may cause serious damages to some sensitive electronics. In order to remove or prevent a buildup of static electricity, packed items must be treated with the application of an antistatic agent, which helps any excess charge to be evenly distributed. Functional pulp tray used for packing of electronic goods was developed with application of an antistatic agent. As the concentration of the antistatic agent increased, charging voltage and surface resistance of molded pulps decreased. The increase of humidity in surrounding atmosphere around molded pulps led to the decrease of accumulation of static charges. In conclusion, the surface treatment of the antistatic agent not only reduced or eliminated buildup of static electricity in the surface, but also prevented generation of tiny dirts from molded tray.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 2011년도 추계학술발표회 논문집
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• pp.335-343
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• 2011

We examined the effect of the acidic liquid from carbonized rice hull(ALCRH) treatments to molded fiber packages(MFP) on weight, Haugh unit, pH and microbial activity of egg to extend the shelf life in egg packaging. Higher concentration and surface spray treatment of the acidic liquid extended the shelf life of egg. ALCRH treatment to MFP improved the performance of the packaging for egg in terms of decreased weight loss and retarded microorganism growth of eggs during storage.

• 월간포장계
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• 통권219호
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• pp.74-77
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• 2011

• Journal of the Korean Wood Science and Technology
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• 제21권2호
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• pp.31-37
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• 1993

Composites of styrene polymers with woody fibers were prepared, and the effect of compatibilizers on their mechanical properties was evaluated. To improve the compatibility of wood fibers and the matrix polymers, styrene-maleic anhydride copolymer(SMA) and maleic anhydride-modified polymers were used as compatibilizers. As results, maleic anhydride-modified polystyrene and SMA were proved to improve the tensile strength of the molded composites, and also were evaluated as good compatibilizers for the wood fiber polystyrene composite. Cellulosic fiber (dissolving pulp) provided better reinforcement than lignocellulosic fiber(thermomechanical pulp). On the contrary in the case of the composite of wood fiber and acrylonitrile-butadiene styrene copolymer(ABS), SMA and maleic anhydride-modified acrylonitrile-butadiene-styrene copolymer(MABS) did not act as compatibilizers. However, MABS was evaluated as a good polymer matrix to make wood fiber reinforced composite. The tensile properties of the composites of wood fiber and MABS were superior than those of wood fiber-ABS composites.

• Journal of the Korean Wood Science and Technology
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• 제27권1호
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• pp.79-87
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• 1999

포장재로 많이 사용되어왔던 발포 폴리스틸렌(EPS)이 환경공해의 원인이 되므로 이를 대체하기 위하여 농업부산물인 볏짚을 포장재의 원료로 이용하고자 볏짚펄프로 성형포장재를 제조하고, 첨가제인 전분, rosin size제, CMC, PEG, AKD, PAM을 첨가량별로 첨가하여 그 물성변화를 무첨가시와 비교하였다. 첨가제첨가시 포장재의 물성 및 경제적인 면에서 AKD 1%를 첨가하는 것이 가장 효과적인 것으로 판단되며, 흡수도는 모든 첨가제에서 첨가량이 증가함에 따라 무첨가시보다 감소되어 첨가제가 수분의 흡수를 억제하여 내수성이 증가하였다.

• 한국포장학회지
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• 제21권1호
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• pp.19-26
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• 2015

종이팩 포장재는 크게 살균팩(Gable top carton)과 멸균팩(Aseptic carton)으로 구분할 수 있는데, 현재 종이팩 재활용 공정에서 가장 중요한 문제는 알루미늄 호일이 첩합된 종이팩이 화장지를 제조하는 재활용 공정에 유입될 경우 제품의 품질에 문제가 생길 수 있다. 최근에는 종이팩 상단의 마개나 종이팩 옆면의 스트로우 합성수지와 같은 성형구조물을 부착한 포장용기가 많이 판매되고 있는데, 이러한 성형구조물은 재활용에 방해가 되는 요인 중의 하나이다. 이와 관련하여 환경부는 2014 '포장재 재질 구조 개선 등에 관한 기준'을 고시하면서 재활용이 용이한 포장재(1등급), 재활용이 어려운 포장재(2, 3등급)로 구분하여 포장재 설계 시 가이드라인이 될 수 있도록 관련 지침을 발표하였다. 종이팩 몸체의 알루미늄 첩합(2등급)을 실리카 증착 등 투명필름 차단제(1등급)로 변경 시 재활용 공정 중 선별 작업의 효율화 및 재활용 수율의 증가를 통해 재활용 경제성을 증가 및 재생제품의 품질을 향상시키는 파급효과가 예측되었다. 또한 종이팩의 잡자재를 합성수지 성형 구조물(2등급) 사용을 제외할 시에도 펄프 회수율 상승과 재생 원료의 품질을 향상, 재활용 공정 중 선별 작업의 효율화를 통해 재활용 경제성을 증가시킬 것으로 예측된다.