Clamp Force — TPU (Shore 85A)
Required clamp tonnage for a TPU (Shore 85A) part from projected area and cavity pressure.
TPU's rubberiness makes ejection the cycle's long pole — parts grab cores and drag; generous draft, air-poppets and patience beat brute ejector force. Under-clamping flashes the parting line; chronic 20% over-clamping crushes vents and wears the platens — size the machine to ~80% of its rating.
Formula
Note: Starting-point process values — the resin grade's datasheet and an in-mold study govern. Verify with a gate-seal study and a cooling-time ladder on the actual tool.
Required clamp tonnage for a TPU (Shore 85A) part from projected area and cavity pressure. A free injection molding cycle & process tool — no sign-up, no upload, instant results in your browser.
About Clamp Force — TPU (Shore 85A)
Clamp Force — TPU (Shore 85A) computes the governing relationship F = A_projected × p_cavity × (1+margin) live as you type. TPU's rubberiness makes ejection the cycle's long pole — parts grab cores and drag; generous draft, air-poppets and patience beat brute ejector force. Under-clamping flashes the parting line; chronic 20% over-clamping crushes vents and wears the platens — size the machine to ~80% of its rating. Defaults are pre-filled with realistic values for this exact scenario, and the worked example substitutes your numbers step by step so the math is never a black box.
How to use Clamp Force — TPU (Shore 85A)
- 1Enter your values — Projected area (part), Cavities, Runner projected area, Cavity pressure and more (sensible defaults are pre-filled).
- 2Read the live results: Required clamp, Per cm² (sanity).
- 3Check the "with your numbers" line to see F = A_projected × p_cavity × (1+margin) substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Clamp Force — TPU (Shore 85A)?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula F = A_projected × p_cavity × (1+margin) with authoritative sources cited on the page (Rosato, Injection Molding Handbook, 3rd ed.; Resin supplier processing data sheets (per-grade values govern))
- ✓TPU's rubberiness makes ejection the cycle's long pole — parts grab cores and drag; generous draft, air-poppets and patience beat brute ejector force.
- ✓SI ⇄ Imperial toggle converts your inputs in place, so you can work in the units your drawings use
Frequently asked questions
What formula does the clamp force — tpu (shore 85a) use?+
It evaluates F = A_projected × p_cavity × (1+margin), exactly as published. Sources: Rosato, Injection Molding Handbook, 3rd ed.; Resin supplier processing data sheets (per-grade values govern). The substituted worked example on the page lets you verify every step against the textbook.
How should I read the result — and how far can I trust it?+
TPU's rubberiness makes ejection the cycle's long pole — parts grab cores and drag; generous draft, air-poppets and patience beat brute ejector force. Starting-point process values — the resin grade's datasheet and an in-mold study govern. Verify with a gate-seal study and a cooling-time ladder on the actual tool.
When is this calculator the right tool for the job?+
Required clamp tonnage for a TPU (Shore 85A) part from projected area and cavity pressure. A free injection molding cycle & process tool. Under-clamping flashes the parting line; chronic 20% over-clamping crushes vents and wears the platens — size the machine to ~80% of its rating. For neighbouring scenarios, the related tools below cover the same engine with different presets.
Does it support both metric and imperial units?+
Yes — the SI ⇄ Imperial toggle converts the values already in the fields, preserving the physical quantity, so you can flip mid-calculation without re-entering anything.
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