An Experimental Study on Wall Thickness Distribution in Thermoforming

Karabeyoğlu, Sencer Süreyya; Ekşi, Olcay; Erdoğan, Ertuğrul

doi:10.12913/22998624/71148

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…Visual inspection Analysis of edges, corners, thickness, roughness [8] Thickness distribution Sheet thickness after thermoforming [9][10][11] Thermoforming process prototyping…”

Section: Test Methods Parameters Referencesmentioning

confidence: 99%

Thermoformability analysis of TPO sheets blended with postindustrial secondary feedstock

Masato

Licata

Gao

et al. 2023

Polymer Engineering & Sci

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Production scrap is a significant cost for automotive thermoforming due to the expensive resin costs and large part sizes. Manufacturers strive to regrind and reprocess sheet cutouts from production runs, however, the utilization of a secondary feedstock can be limited by its impact on the sheet processing behavior. To mitigate the economic impact of production scrap, the thermoformability of a blend needs to be predicted at the material development stage. In this work, a test mold is designed to assess the thermoformability of blended TPO sheets. The mold design is developed to evaluate the effects of different geometries. Regrind content is introduced in the blend before extrusion to compare the sheet properties to those of a virgin material configuration. The statistical analysis of the thermoforming experiments shows that the sheet thickness reduction is affected by the draw ratio and sheet temperature. Multivariate regression modeling allows for predicting the thermoformed part thickness as a function of the sheet configuration, draw ratio, and processing conditions. However, the introduction of regrind content, below 50%, did not affect thermoformability. The stretchability of the sheets was also characterized by uniaxial tensile testing and dynamic mechanical analysis, confirming the absence of negligible differences when regrind content is introduced in the blend.

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“…Visual inspection Analysis of edges, corners, thickness, roughness [8] Thickness distribution Sheet thickness after thermoforming [9][10][11] Thermoforming process prototyping…”

Section: Test Methods Parameters Referencesmentioning

confidence: 99%

Thermoformability analysis of TPO sheets blended with postindustrial secondary feedstock

Masato

Licata

Gao

et al. 2023

Polymer Engineering & Sci

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“…Pada penelitian sebelumnya, beberapa studi telah dilakukan untuk mengkaji pengaruh parameterproses terhadap distribusi ketebalan dinding dan akurasi dimensi dalam proses thermoforming [5] [6]. Namun, penelitian yang lebih rinci dan terfokus masih diperlukan untuk memperoleh pemahaman yang lebih mendalam tentang interaksi antara parameter-proses tersebut.…”

Section: Pendahuluanunclassified

Pengaruh Parameter Proses Thermoforming Terhadap Distribusi Ketebalan dan Akurasi Dimensi Produk

Budiyantoro,

Kurniawan

2023

JMPM

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Penelitian ini melihat pengaruh parameter-proses thermoforming, yaitu waktu pemanasan, pre-stretching degree, dan tingkat evakuasi vakum, terhadap distribusi ketebalan dinding dan akurasi dimensi produk plastik yang diproses dengan thermoforming. Penelitian dilakukan serangkaian percobaan dengan tiga variasi parameter-proses tersebut. Waktu pemanasan divariasikan masing-masing 30, 35 dan 40 detik, pre-stretching degree dari 0,1 hingga 0,3, dan evacuation rate dalam nilai 6 mm/detik, 8 mm/detik dan 10 mm/detik. Hasil penelitian menunjukkan bahwa parameter yang mampu meminimalkan radius pada sudut specimen adalah: tingkat evakuasi 10 mm/detik, waktu pemanasan 40 detik dan derajad pre-stretching 0,1 Vst. Hasil produk vacuum forming dapat dioptimalkan dengan kombinasi tingkat evakuasi vakum yang tinggi, waktu pemanasan lebih lama dan derajad pre-stretching rendah. This study examines the influence of thermoforming process parameters, namely heating time, pre-stretching degree, and vacuum evacuation rate, on the distribution of wall thickness and dimensional accuracy of the product. The research involved a series of experiments with three variations of these process parameters. Heating time was varied at 30, 35, and 40 seconds, pre-stretching degree ranged from 0.1 to 0.3, and evacuation rates were set at 6 mm/s, 8 mm/s, and 10 mm/s, respectively. The results showed that the parameters capable of minimizing the radius at the specimen's corners were a vacuum evacuation rate of 10 mm/s, a heating time of 40 seconds, and a pre-stretching degree of 0.1 Vst. The findings suggest that the vacuum forming products can be optimized by combining a high vacuum evacuation rate, longer heating time, and low pre-stretching degree.

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“…Although this process is similar to other polymer processing me thods [17][18][19], it requires separate studies due to its specificity. Despite the fact that the origins of thermoforming go back to the 1870s and its practical aspects have been thoroughly examined, the process is still the subject of numerous research studies [20][21][22][23][24][25][26][27][28][29][30][31][32] and publications for manufacturers [33][34][35]. In this paper, a thermoforming process for producing polystyrene sheet by vacuum forming and vacuum assisted drape forming with and without pre-blow is investigated.…”

Section: Wykorzystanie Funkcji Użyteczności W Optymalizacji Procesu Termoformowaniamentioning

confidence: 99%

The use of utility function for optimization of thermoforming

Sasimowski

2018

Polimery

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The paper describes a utility function -based method for optimization of a thermoforming process for producing finished parts made of polystyrene sheet by vacuum forming and vacuum assisted drape forming with and without pre-blow. Not only does the proposed method enable determination of optimum thermoforming conditions, it also provides information about interactions between these conditions as well as about their impact on the properties of finished parts and polymer heating time, a factor which affects efficiency of this process. The determined optimum thermoforming conditions significantly differ for thermoforming without pre-blow and thermoforming with pre-blow, which results from different ways of forming individual regions of polystyrene sheet during both processes. The employed method enables determination several optimum criteria, the number of which can be extended as desired, which is significant for practical applications of machines and devices.

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An Experimental Study on Wall Thickness Distribution in Thermoforming

Cited by 3 publications

References 12 publications

Thermoformability analysis of TPO sheets blended with postindustrial secondary feedstock

Thermoformability analysis of TPO sheets blended with postindustrial secondary feedstock

Pengaruh Parameter Proses Thermoforming Terhadap Distribusi Ketebalan dan Akurasi Dimensi Produk

The use of utility function for optimization of thermoforming

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