손잡이 일체형 PET 용기 제작을 위한 블로우 성형에 대한 수치적 연구

김종덕,고영배,김홍렬,권창오,Kim, Jong-Duck,Go, Young-Bae,Kim, Hong-Ryul,Kwon, Chang-Oh 한국금형공학회 2008 한국금형공학회지 Vol.2 No.3

Forming of PET bottle was performed by injection-stretch blow molding. Blow molding is process of contacting the dies with air of materials by pressing. In this paper, the aim was to improve reliability of technical stabilization for the PET bottle that is last productive product and process technology which was able to do maximization by a preform performance enhancement of the uniform thickness that took temperature and a characteristic of materials. Preform design and dies manufacture were conducted using injection blow molding analysis results. Therefore thickness error of 5% for PET bottle can be obtained in this paper.

블로우 성형공정변수가 PET 용기에 미치는 영향에 관한 연구

김종덕,고영배,김옥래,박형필,김홍렬,권창오,Kim, Jong-Dug,Go, Young-Bae,Kim, Ok-Rae,Park, Hyung-Pil,Kim, Hong-Ryul,Kwon, Chang-Oh 한국금형공학회 2008 한국금형공학회지 Vol.2 No.6

Injection-stretch blowing system for preform has been developed in this study. The preforms for injection blow molding and injection stretch blow molding are being manufactured by injection molding. However it contains gate mark that affects the bottom crack in the PET bottle. The compression molded preform does not contain gate mark, thus the appearance quality of bottle has been increased and the residual stress near gate(bottom of the bottle) has been reduced. The thickness distributions, haze, and transmittance are well accepted for the preform. Also, flow characteristics of the resin between a core and cavity could be analyzed through computer simulation.

Simulation Study on the Effect of Pre-blow Timing on the Injection Stretch Blow Molding

최동해,남경우,류민영 한국고무학회 2022 엘라스토머 및 콤포지트 Vol.57 No.4

Research on the reduction of plastic use to prevent environmental pollution is urgently needed. Accordingly, studies on reducing the weight of polyethylene terephthalate (PET) bottles are currently being conducted. PET bottles are fabricated by injection stretch blow molding. In this study, stretch blow molding for fabricating PET bottles using preform studied through a computer simulation. Blowing characteristics are analyzed by varying the start time of the pre-blow, which is one of the process conditions of stretch blow molding. Simulation results and the preform inflation process are presented, and the parameters of stretch ratio, stretching path, thickness distribution, and weight distribution of blown PET bottles are investigated.

Extrusion Blow Molding에서 성형조건에 따른 성형품의 치수변화

전장옥,이학관,전재후,류민영 한국고분자학회 2004 한국고분자학회 학술대회 연구논문 초록집 Vol.29 No.2

유한요소법을 이용한 PET병의 성형 공정 해석

주성택,김용환,류민영 한국소성가공학회 2001 소성가공 : 한국소성가공학회지 Vol.10 No.7

PET bottles are main]y manufactured by the stretch blow-molding process. In order to improve the thickness distribution to avoid crack generation at bottom region of one-piece PET bottle, process analysis of stretch blow-molding using a finite element method has been carried out. Finite element analysis has been carried out using ABAQUS/Standard. CREEP user subroutine provided in ABAQUS has been used to model PET behavior that is rate sensitive. Among the process parameters, the effect of plunger movement to thickness distribution of bottle has been considered by axisymmetric analysis. A modified process of plunger movement, which yields more uniform thickness distribution, has been proposed. 3D FE analysis has been done to confirm the validity of the proposed process.

분지 폴리카보네이트 합성 및 반응 특성 연구

김환기,김상필,김선호 건국대학교 자연과학연구소 1998 建國自然科學硏究誌 Vol.9 No.1

The branched polycarbonate was prepared from bisphenol A and trihydroxphenyl co-monomers in batch reactors. The polymerization was based upon phosgenation, followed by condensation with triethylamine as a catalyst. The polymers were characterized by differential scanning calorimetry(DSC), gel permeation chromatography(GPC), and thermogravimetric analyses(TGA). The relative kinetic studies of branched polycarbonate system that in polycondensation steps the reaction rates are more dependent on the content of branching agent than the corresponding linear polycarbonate. These results illustrate the branched polycarbonate was predominantly formed cyclic oligomers in terms of trihydroxyphenyl comonomer. The melt index ratio(MIR) of branched polycarbonates obtained was in the range of 20~25, which are compatible with application of blow molding.

후육 벽 PET 용기에 대한 사출 블로우 성형의 유한요소해석

홍석관,송민재,고영배,차백순 한국금형공학회 2018 한국금형공학회지 Vol.12 No.3

Plastic containers which provides the opportunity to reduce transportation costs are lighter and less brittle than glass containers. As a results, efforts to replace glass with plastic are ongoing. The blow molding method is a typical approach in producing plastic containers. Single-stage injection blow molding (ISBM) is one of the blow molding methods. However, the difficulty in controlling the temperature during the injection molding process is considered its main disadvantage. In this study, ISBM process analysis of relatively thick walled containers such as cosmetic containers is carried out. The initial temperature distribution of the preform is deemed to be the most influential factor in the accuracy of blow molding for the thick vessel. In order to accurately predict this, all heat transfer processes of the preform are considered. The validity of this analytical procedure is verified by comparing the cross-sectional thickness with the actual product. Finally, the validated analytical method is used to evaluate the factors affecting the thickness of the final molded part. The ISBM analysis technique for thick walled vessels developed through this study can be used as an effective predictor for preform design and blow process. Key Words: Blow molding, FEM, Injection molding, ISBM

블로우 성형 공정 변수가 PET 용기의 두께 편차에 미치는 영향에 관한 수치해석 연구

김정순,김종덕 대한공업교육학회 2009 대한공업교육학회지 Vol.34 No.2

This study presents the blow molding of injection stretch-blow molding process for PET bottle. The numerical analysis of the blow molding of PET bottle is considered in this paper using CAE with a view to minimize the thickness difference. In order to determine the design parameters and processing conditions in blow molding, it is very important to establish the numerical model with physical phenomenon. In this study, a shell model with thickness has been introduced for the purpose and blow simulations with 3-type blow process condition are carried out. The simulations resulted in the thickness distribution in good agreement with the physical phenomenon. Also, from the result of numerical analysis, we appropriately predicted the thickness distribution along the PET bottle wall and Using the result of numerical analysis we apply the preform design and blow molding process condition for optimization 사출-연신 블로우(injection-stretch blowing) 성형은 양방향 분자배향을 가지는 병(bottle)과 같은 중공 제품을 성형하는데 적용되며, 양방향의 배향은 강화된 물 리적 상태량, 탄산음료병과 같은 제품에 중요한 가스 불 투과성 상태량을 제공한 다. 사출-연신 블로우 성형 중 분리형(two-stage) 공정은 사출 성형으로 생산된 프 리폼을 적외선 히팅 기구로 재 가열하고. 재 가열된 프리폼을 블로우 금형 안에 장착한 후 고압의 공기를 분사시켜 병의 형상을 생성 및 유지하면서 완성시킨다. 그러나 블로우 성형은 연신율이 10배 이상이 되기 때문에 최종 두께 분포를 예측 하는 것이 매우 어렵다. 따라서 균일한 두께를 가질 수 있는 프리폼 형상 최적화 가 필요하다. 본 연구에서는 블로우 성형 연신 과정에 따라 페트 용기의 두께 변화를 알아 보기 위하여 사출-연신 블로우 성형시 두께 편차에 대한 해석을 수행하였으며, 그 결과 첫째 사출-블로우 성형 로우 결과를 이용하여 프리폼 초기 설계를 최적화하 였고, 연신 및 블로우 과정에서 공정 편차에용기 두께며, 그 결과 을 수치적으로 로우하여 공정 편를 최적화하였다. 둘째, 사출-블로우 성형시 연신 과정과 동시에 공기를 블로우하는 방법이 용기 두 께의 편차를 최소화하였으며, PET용기 제작 기술의 안정화 및 신뢰성을 향상시킬 수 있었다.

고분자 패키징 용기 중량 절감을 위한 프리폼 설계에 관한 연구

김정순(Kim, Jeong-Soon) 한국산학기술학회 2010 한국산학기술학회논문지 Vol.11 No.1

본 연구에서는 성형해석 및 실험적 방법을 통하여 페트 용기의 두께 편차를 최소화하기 위한 프리폼 최적화 설계를 수행하였다. 사출성형과정을 정확하게 묘사하기 위하여 3차원 모델을 이용하여 충진, 보압 및 냉각해석을 통 하여 최적의 프리폼 설계변수를 설정하였으며, 이 결과를 이용하여 블로우 성형해석을 수행하였다. 성형해석결과를 평가하기 위한 사출성형 및 블로우 성형실험을 수행하였으며, 실험결과와 해석결과는 정성적으로 일치하는 것을 확인 하였다. 이러한 실험결과 데이타를 설계에 반영함으로서 최적의 프리폼 형상을 얻을 수가 있었다. This study presents the preform injection molding and the blow molding of the injection stretch-blow molding process for PET bottles. The numerical analysis of the injection molding and the blow molding of a preform is considered in this paper using CAE with a view to minimize the warpage and the thickness. In order to determine the design parameters and processing conditions in injection/blow molding, it is very important to establish the numerical model with physical phenomenon. In this study, a three dimensional model has been introduced for the purpose and flow simulations of filling, post-filling and cooling process are carried out. The simulations resulted in the warpage in good agreement with the measurements. Also, from the result of numerical analysis, we appropriately predicted the warpage, deformation and thickness distribution along the product walls.

페트용기 성형을 위한 프리폼 사출성형 및 블로우 성형의 실험 및 해석에 관한 연구

김정순(Kim, Jeong-Soon),김종덕(Kim, Jong-Deok),김옥래(Kim, Ok-Rae),권창오(Kwon, Chang-Oh) 한국산학기술학회 2008 한국산학기술학회논문지 Vol.9 No.5

본 연구는 성형해석 및 실험적 방법을 통하여 페트 용기의 두께 편차를 최소화하기 위한 프리폼 최적화 설계를 수행하였다. 사출성형과정을 정확하게 묘사하기 위하여 3차원 모델을 이용하여 충진, 보압 및 냉각해석을 통하여 최적의 프리폼 설계변수를 설정하였으며, 이 결과를 이용하여 블로우 성형해석을 수행하였다. 성형해석결과를 평가하기 위한 사출성형 및 블로우 성형 실험을 수행하였으며, 실험결과와 해석결과는 정성적으로 일치하는 것을 확인 하였다. 이러한 실험결과 데이타를 설계에 반영함으로서 최적의 프리폼 형상을 얻을 수가 있었다. This study presents the preform injection molding and the blow molding of the injection stretch-blow molding process for PET bottles. The numerical analysis of the injection molding and the blow molding of a preform is considered in this paper using CAE with a view to minimize the warpage and the thickness. In order to determine the design parameters and processing conditions in injection/blow molding, it is very important to establish the numerical model with physical phenomenon. In this study, a three dimensional model has been introduced for the purpose and flow simulations of filling, post-filling and cooling process are carried out. The simulations resulted in the warpage in good agreement with the measurements. Also, from the result of numerical analysis, we appropriately predicted the warpage, deformation and thickness distribution along the product walls.