Thermoforming
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Local over-thinning in ABS '2079851475616104458
Problem Phenomenon
The wall thickness of the vacuum formed part is too thin at the deeply stretched corners, easy to break, shiny when viewed against light, and insufficient in strength.
Cause Analysis
The draw ratio is too large and there is no plug assist, so the material is locally over-stretched; uneven heating makes the locally hotter areas thin first; uneven original sheet thickness is also an inducement.
Solution
①Add a pressure assist plug (felt-surface plug is suitable for ABS/HIPS); ②thicken the original sheet by 0.3~0.6mm; ③zone heating to retain more material in the stretch area; ④select sheets with consistent thickness; ⑤optimize the draw ratio design.
Key Takeaway
ABS deep drawing must rely on a plug to 'deliver' the material to the corner: plug assist + zone heating + thicker sheet work together; local over-thinning is a material distribution problem, not something that can be solved by simply adjusting the temperature.
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