🔎 How to Use This Calculator

Select your resin — picks a reference cavity pressure range automatically.
Adjust cavity pressure — fine-tune based on wall thickness and gate design.
Set projected area — measure the largest shadow area of one cavity in cm².
Choose your cavity layout — 1 to 16 cavities, or enter a custom count.
Read the results — recommended tonnage, machine utilization gauge, and actionable alerts appear instantly.

💡 Engineering Insight: The ideal machine utilization window is 70–90% of rated clamping force. Below 50% wastes energy and accelerates tie-bar wear; above 95% risks flash, mold damage, and inconsistent part weight. Always include gate and runner projected area, and add ≥ 1.20× safety factor for multi-cavity or precision tools.

CLAMP CALC · REV 2

Clamping Force & Machine Selection

Resin material — sets reference cavity pressure

Average cavity pressure (MPa)

20 MPa

PP reference range: 15–30 MPa · current value is within range

Projected area per cavity (cm²)

80 cm²

Include gate projection; exclude runner system

Safety factor

Standard pick · suits most production tools

Cavity layout

Number of cavities: cav

Calculation results live

Theoretical clamp

—

Design clamp force

—

kN (incl. safety factor)

Required tonnage

—

metric ton-force

Projected area per cavity—

Total projected area (× cavities)—

Avg. cavity pressure—

Theoretical clamping force—

× safety factor—

Design clamping force (final)—

Machine utilization — design force vs. recommended press

0% 25% 50% 70% 90% 100%

Press tonnage options

🔗 Embed This Calculator on Your Website

Copy the snippet below and paste it into any HTML page, WordPress Custom HTML block, or website builder. The tool is fully self-contained — no scripts, no dependencies.