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Good demoulding TPU is achieved using internally lubricated grades, specialized additives like SILIMER 5150, or polyester wax to reduce stickiness, especially for soft or complex parts. Optimal demoulding requires 2–5° draft angles, polished mold surfaces (0.5–0.6 µm roughness), and proper cooling, as TPU is highly viscous and prone to sticking immediately after injection.
Key Factors for Easy TPU Demoulding:
- Internal Lubricants: Using TPU compounded with silicone-based additives (e.g., SILIMER 5150) or specialized waxes (69 polyester wax) improves release without causing migration.
- Mold Design & Surface:
- Draft Angles: Implement at least 2–3° of taper (draft) for soft TPU, or up to 5° for complex parts to ease extraction.
- Surface Finish: Polish the cavity to 0.5–0.6 µm roughness to minimize surface adhesion.
- Uniform Walls: Maintain uniform wall thickness (ideally 1.5–4.0 mm) and smooth transitions to prevent stuck, stressed areas.
- Processing Techniques:
- Cooling Time: Ensure adequate cooling to solidify the part, reducing its viscosity, which is typically high immediately after molding.
- Release Agents: Use specialized TPU release agents if internal lubrication is not enough.
- 3D Printed Molds: For 3D-printed TPU parts (e.g., in molds), using a fine layer height (0.12mm) and a sacrificial layer (like a glue stick on PEI) can significantly help.
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Web results
Key points of injection molding technology for TPU mobile ...
Gud Mould
http://www.gudmould.com › news
Gud Mould
http://www.gudmould.com › news
Sep 25, 2024 — TPU should be annealed at low temperature for a long time. Products with lower hardness can achieve optimal performance by leaving them at room ...Read more
Discussions and forums
TPU in a mold
Reddit ·
r/3Dprinting
· 5 comments
· 3 years ago
TPU in a mold
Reddit ·
r/3Dprinting
· 5 comments
· 3 years ago
What is the best TPU for printing molds for resin
Facebook ·
3D Printing Oz
· 2 comments
· 3 years ago
What is the best TPU for printing molds for resin
Facebook ·
3D Printing Oz
· 2 comments
· 3 years ago
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People also ask
What solvents can dissolve TPU?
Lubrizol TPUs can be dissolved in several solvents, such as Tetrahydrofuran (THF), Dimethylacetamide (DMAC), or Methylene Chloride (MC) depending on the grade. Refer to the Lubrizol Life Science Medical Device Literature under “Solvent Effects Testing” for additional details: http://go.lubrizol.com/solventprocessing.
Solvent Processing Guidelines for Lubrizol TPU
Lubrizol's Media Library
https://media.lubrizol.com › Documents › Literature › So...
Lubrizol's Media Library
https://media.lubrizol.com › Documents › Literature › So...
Is 85A TPU better than 80A?
A higher value means the filament is harder and less flexible. For stable printing, TPU with a hardness of 85A or higher is recommended. Softer TPU (such as 83A or 80A) bends easily during feeding, which can cause filament buckling, tangling, or unstable extrusion.
TPU Printing Guide | Bambu Lab Wiki
Bambu Lab Wiki
https://wiki.bambulab.com › knowledge-sharing › tpu-pr...
Bambu Lab Wiki
https://wiki.bambulab.com › knowledge-sharing › tpu-pr...
Can TPU be remelted?
This can be either added to new filament for 3D printing or added to other materials to benefit from the TPU characteristics, such as flexibility, durability, or resistance to abrasion and chemicals. As a test, we have shredded and remelted TPU into recycled filament, which we can use to produce new prints.Dec 6, 2024
Recyclability of TPU material - Create it REAL
Create it REAL
https://www.createitreal.com › 2024/12/06 › recyclability...
Create it REAL
https://www.createitreal.com › 2024/12/06 › recyclability...
Web results
Best practices for TPU. : r/ender3
Reddit · r/ender3
10+ comments · 3 years ago
Reddit · r/ender3
10+ comments · 3 years ago
If you are using resin, then a latex mold might be the better idea. You could always design and print out your object in PLA or PETG, smooth it ...Read more
DIMENSIONALLY STABLE AND HIGH-PRECISION TPU ...
Bada AG
https://bada.de › news-en › dimensionally-stable-and-hi...
Bada AG
https://bada.de › news-en › dimensionally-stable-and-hi...
Jan 14, 2020 — If abrasion resistance, chemical resistance, seal effect and highest strain values without tearing are required, TPU is the answer. The benefits ...Read more
TPU Material,Polyurethane Pellet,Polyester Based ...
Kunsun Polymer Material (Fujian) Co., Ltd
https://www.tpupolymer.com › products_2
Kunsun Polymer Material (Fujian) Co., Ltd
https://www.tpupolymer.com › products_2
We can provide cost effective TPU material,polyurethane pellet,polyester based TPU and TPU resin to our clients. We look forward to serving you for all your ...
Polyester wax for TPU release agent - TIANSHI Wax
tianswax.com
https://www.tianswax.com › ...
tianswax.com
https://www.tianswax.com › ...
Mar 2, 2022 — ADDIMER® 697 calcium saponified polyester wax has excellent performance in TPU granulation, TPU shoe sole, TPU mobile phone case and other non-transparent TPU ...Read more
What are the main points of TPU injection molding?
plasticomould.com
https://www.plasticomould.com › Knowledges
plasticomould.com
https://www.plasticomould.com › Knowledges
Dec 9, 2020 — The taper of the mold should be at least 5°, which is obvious when made with soft TPU. The staggered taper improves the release from the mold ...Read more
Self-shrinking soft demoulding for complex high-aspect- ...
Nature
https://www.nature.com › ... › articles
Nature
https://www.nature.com › ... › articles
by D Fan2022Cited by 44 — In a similar way, thermoplastic polyurethane (TPU-95A, eSUN) was used for the tests. Except for simple straight filaments, different template ...Read more
Using TPU for AMS for Handle Molds
YouTube · Pottery by Kent
2K+ views · 12 months ago
YouTube · Pottery by Kent
2K+ views · 12 months ago
Let's see if the TPU is any better definitely is more bendy and one of the hard parts are these corners here it doesn't want to flex with the regular filament.
GYC TPU Processing lubricant agent
UL Prospector
https://www.ulprospector.com › additives › datasheet
UL Prospector
https://www.ulprospector.com › additives › datasheet
Advantage - Excellent TPU flowing accelerator - Offer good lubricant ability and anti-viscosity for TPU - Increase demoulding deformation of TPU, ...