Effect of the Convergent-Filamentary Die Geometry on Volume Expansion of PS Foams Blown with CO <sub>2</sub>
Bibliographic record
Abstract
This paper presents the effects of the convergent-filamentary die geometry on the volume expansion behaviors of extruded PS foams blown with supercritical CO 2 . Three groups of interchangeable convergent-filamentary dies were designed to thoroughly represent the die parameters. The experimental results reveal that the die geometry affects volume expansion of the extruded foams through its influences on the die pressure, the pressure-drop rate, and the amount of premature cell growth inside a convergent-filamentary die. Compared with the constant pressure-drop rate for a straight die, the pressure-drop rate for a convergent die increases along the die land, which is favorable for promoting cell nucleation and suppressing premature cell growth. Although the convergent shape is favorable for volume expansion, foams with a low expansion ratio were produced for those dies with a low pressure and a low pressure-drop rate because of the promoted premature cell growth.
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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 | 0.000 |
| 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".