Sofia Martinez
To calculate the weight and price of plastic film, you need to know the film's width, length, thickness, and density. By multiplying these factors together, you can determine the weight of the plastic film in kilograms. This calculation is often referred to as the cut and weigh method and provides an average thickness estimation. Additionally, there are online calculators available that can assist in determining the weight and price of plastic film. These calculators may require specific input values, such as volume and density, to compute the desired measurements.
| Characteristics | Values |
|---|---|
| Formula | (volume) x (density) = (weight) |
| Thickness calculation | Cross sectional area x Weight x Density |
| ASTM standard | ASTM E252 |
| Cut and weigh method calculation | Film width x Film length x Film thickness x Film density = Weight in kg |
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What You'll Learn
Film thickness and weight calculation
To calculate the thickness and weight of plastic film, you can use a variety of methods and tools. One of the most popular methods is the "cut and weigh" method, which provides an accurate average material thickness calculation. This method involves using the equation (volume) x (density) = (weight) to determine the thickness of the plastic film. The density of the material is crucial for this calculation, and if unknown, it can be measured using a gas pycnometer.
SolveTech, a company specializing in thickness gauging, offers free calculators to determine the thickness and basis weight of plastic film. Their calculators use proper conversion factors for different units and can be used to calculate the average thickness of various materials. The PR2000, a highly accurate tool, can be calibrated using the gauge-by-weight method to provide both average film thickness and film variability.
Film thickness can also be determined using the cross-sectional area, weight, and density of the film. This forms the basis for the NIST traceable calibration called ASTM D8136. Additionally, SolveTech provides tutorials and expertise to help manufacturers understand their extrusion processes and improve plastic film quality and uniformity.
It is important to note that the calculators and methods mentioned above are designed to provide accurate thickness calculations for plastic film and other materials. However, specific weight-based pricing calculations for plastic film were not readily available.
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Density and weight
The density and weight of plastic film are important factors in determining its thickness and average weight. While some manufacturers use grams per cubic centimetre to indicate the weight of their products, others provide the specific gravity of their material. Specific gravity measures the density of an object relative to water, which weighs one gram per cubic centimetre. For example, a material with a specific gravity of 1.5 would weigh 1.5 grams per cubic centimetre.
The density and weight of plastic film can be calculated using the equation (volume) x (density) = (weight). This calculation is known as the cut and weigh method, which provides an average thickness calculation. However, it requires knowledge of the material's density, which can be measured using a gas pycnometer.
Different types of plastics have varying densities and weights. For instance, Acrylonitrile Butadiene Styrene (ABS), commonly used in refrigeration and automotive industries, has a density of 1.03 grams per cubic centimetre. Polyvinyl Chloride (PVC), a popular choice for signs and displays due to its aesthetic appeal, is one of the lightest plastics available.
Another example is Starboard, a high-density polyethylene (HDPE) created by the King Corporation, which is known for its durability in saltwater and sunlight exposure. It has a weight of 1.27 grams per cubic centimetre, slightly higher than that of polycarbonate. These weight and density variations among plastics impact their suitability for specific projects, with engineers considering weight to be a critical factor in material selection.
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Cross-sectional area and weight
The weight of a plastic film is calculated by multiplying its volume by its density. This calculation provides the theoretical thickness of the plastic film. This calculation is also known as the cut and weigh method, which is often used because it provides a sound average material thickness calculation. However, it is dependent on knowing the material's density. If the density is unknown, it can be measured using a gas pycnometer.
The weight of a material is referred to as its basis weight, which is calculated as the weight per unit area. The unit area refers to the cross-sectional area of the material. The cross-sectional area of a material is a geometric property used in solid mechanics and structural engineering. It is used in the design of beams or flexural members.
The cross-sectional area of a material is also used to calculate its section modulus, which is a measure of its capacity to resist bending. There are two types of section modulus: elastic and plastic. The elastic section modulus is used to calculate a cross-section's resistance to bending within the elastic range, where stress and strain are proportional. It is used for general design and is applicable to most metals and other common materials.
The plastic section modulus, on the other hand, is used to calculate a cross-section's capacity to resist bending after yielding has occurred across the entire section. It is used for materials and structures where limited plastic deformation is acceptable and reflects the section's strength beyond the elastic range. The plastic section modulus depends on the location of the plastic neutral axis (PNA), which is the axis that splits the cross-section such that the compression force from the area in compression equals the tension force from the area in tension.
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ASTM standard calculation method
The ASTM, formerly known as the American Society for Testing and Materials, has developed a set of standards for measuring plastic film thickness. These standards aim to improve the final product, maintain industry integrity, and streamline the manufacturing process. Manufacturers often certify that they have adhered to the relevant ASTM standards for each film product they have produced.
There are three main ASTM standards for measuring plastic film thickness:
- E252: Test Method for Thickness of Foil, Thin Sheet, and Film by Mass Measurement. This method is often referred to as "gauge by weight" and involves calculating the average film thickness using the material's weight, density, length, and width.
- D6988: Guide for Determination of Thickness of Plastic Film Test Specimens.
- D8136: Standard Test Method for Determining Plastic Film Thickness and Thickness Variability Using a Non-Contact Capacitance Thickness Gauge. This is the latest standard and applies more advanced technology, offering greater precision and the ability to standardise the definition of film variability.
Other ASTM standards related to plastic film thickness include:
- D7192-10: Standard Test Method for High-Speed Puncture Properties of Plastic Films Using Load and Displacement Sensors.
- D7310-11: Standard Guide for Defect Detection and Rating of Plastic Films Using Optical Sensors.
- D882-12: Standard Test Method for Tensile Properties of Thin Plastic Sheeting.
- D1004-13: Standard Test Method for Tear Resistance (Graves Tear) of Plastic Film and Sheeting.
- D1204-14: Standard Test Method for Linear Dimensional Changes of Nonrigid Thermoplastic Sheeting Temperature.
- D1239-14: Standard Test Method for Resistance of Plastic Films to Extraction by Chemicals.
- D4321-09: Standard Test Method for Package Yield of Plastic Film.
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Cut and weigh method
The cut and weigh method is a way to calculate the average thickness of plastic film. This method is often used because it provides a sound average material thickness calculation.
To use the cut and weigh method, you need to know the material density. If you don’t know the density of your material, it can be measured using a gas pycnometer.
Once you have the density, you can use the equation (volume) x (density) = (weight) to calculate the thickness of the plastic film. This equation can also be rearranged to calculate the volume or density of the plastic film if you know the weight and thickness.
There are also free online calculators that can be used to calculate the thickness of plastic film using the cut and weigh method. These calculators use the weight, density, and cross-sectional area of the plastic film to determine its thickness.
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Frequently asked questions
The weight of plastic film can be calculated by multiplying film width, length, thickness, and density. The formula is: A (film width) x B (film length) x C (film thickness) x D (film density) = weight in kg.
The formula for calculating the thickness of plastic film is (volume) x (density) = (weight). This method is also known as the cut and weigh method.
You can calculate the basis weight of plastic film using a calculator, such as the ones provided by SolveTech.
