Film Roll Weight Calculator

Film Roll Weight Formula:

\[ W = \pi \times \left(\left(\frac{OD}{2}\right)^2 - \left(\frac{ID}{2}\right)^2\right) \times Width \times Density \]

Outer Diameter (OD):

Inner Diameter (ID):

Width:

Density:

kg/m³

Film Roll Weight (kg):

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1. What is a Film Roll Weight Calculator?

Definition: This calculator estimates the weight of a film roll based on its dimensions (outer diameter, inner diameter, width) and material density.

Purpose: It helps packaging professionals, manufacturers, and logistics teams determine the weight of film rolls for transportation, storage, and material planning.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ W = \pi \times \left(\left(\frac{OD}{2}\right)^2 - \left(\frac{ID}{2}\right)^2\right) \times Width \times Density \]

Where:

\( W \) — Weight of film roll (kg)
\( OD \) — Outer diameter of roll (m)
\( ID \) — Inner diameter (core) of roll (m)
\( Width \) — Width of the roll (m)
\( Density \) — Material density (kg/m³)

Explanation: The formula calculates the cross-sectional area of the film material and multiplies by width and density to get total weight.

3. Importance of Film Roll Weight Calculation

Details: Accurate weight estimation ensures proper load planning, transportation safety, and inventory management in film production and distribution.

4. Using the Calculator

Tips: Enter all dimensions in meters. Typical plastic film density is around 900 kg/m³ (default value), but this varies by material type.

5. Frequently Asked Questions (FAQ)

Q1: Why is the inner diameter important?
A: The ID accounts for the hollow core of the roll, which doesn't contain material and shouldn't be included in weight calculations.

Q2: What's a typical density for plastic films?
A: Most plastic films range from 800-1000 kg/m³, with 900 kg/m³ being a common average for polyethylene films.

Q3: How do I measure the dimensions accurately?
A: Use calipers for precise measurements. Measure OD and ID at several points and average the results.

Q4: Does this work for other rolled materials?
A: Yes, the calculator works for any cylindrical rolled material when you input the correct density (paper, foil, etc.).

Q5: What if my roll isn't perfectly cylindrical?
A: The calculation assumes perfect cylinders. For irregular rolls, consider taking multiple measurements and averaging.