Plastic Film Roll Weight Calculator

Plastic 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):

meters

Inner Diameter (ID):

meters

Width:

meters

Density:

kg/m³

Roll Weight (kg):

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1. What is a Plastic Film Roll Weight Calculator?

Definition: This calculator estimates the weight of a plastic film roll based on its physical dimensions and material density.

Purpose: It helps manufacturers, packaging professionals, and material handlers determine the weight of plastic film rolls for shipping, storage, and production 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 the roll (kg)
\( OD \) — Outer diameter of the roll (meters)
\( ID \) — Inner diameter (core diameter) (meters)
\( Width \) — Width of the roll (meters)
\( Density \) — Material density (kg/m³)

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

3. Importance of Roll Weight Calculation

Details: Accurate weight estimation ensures proper material handling, shipping cost calculations, and production planning. It also helps in inventory management and quality control.

4. Using the Calculator

Tips:

Measure outer diameter (OD) and inner diameter (ID) in meters
Enter roll width in meters
Default density is 900 kg/m³ (typical for LDPE) but can be adjusted
All values must be > 0 and OD must be > ID

5. Frequently Asked Questions (FAQ)

Q1: What's a typical density for plastic films?
A: Common densities: LDPE ~900 kg/m³, HDPE ~950 kg/m³, PP ~910 kg/m³, PET ~1380 kg/m³.

Q2: How do I measure the roll dimensions?
A: Use calipers or measuring tape for OD and ID. Measure width across the roll face.

Q3: Does this account for core weight?
A: No, this calculates only the film weight. Add core weight separately if needed.

Q4: Can I use this for other rolled materials?
A: Yes, for any uniformly dense rolled material (paper, foil, etc.) by adjusting density.

Q5: Why is my calculated weight different from actual?
A: Variations can occur due to air gaps between layers, inconsistent winding, or material density variations.