Double Crystal Melting Peak Generation for Expanded Polypropylene Bead Foam Manufacturing
Bibliographic record
Abstract
A high-pressure differential scanning calorimeter chamber was used to investigate double crystal melting peak generation in polypropylene. The double crystal melting peak forms during the batch-based, expanded polypropylene (EPP) bead foaming process. This double peak structure is required for good sintering and the desired geometric shape of the final bead foam products. To form the double peak structure, isothermal treatment over a certain period of time is necessary at a high temperature and saturated pressure during the batch foaming process. This study investigated the influences of various saturation temperatures, time, and pressure on double crystal melting peak behavior. It was seen that the temperature was the most sensitive parameter on double peak generation. Also, the longer saturation time increased the amount of perfect crystals with a high melting temperature. Furthermore, as the saturation pressure increased, the required saturation temperature for generating the second peak with perfected crystals decreased through the plasticization effect of CO 2 .
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".