ASTM Methods For Testing Shrink Wrap

ASTM is a standards development organizations that provides technical standards for materials, products, systems, and services. The following testing methods are used for shrink wrap to test it's strength and usability.

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Coefficient of Friction

This test is used to determine the amount of friction between two surfaces of film. A sheet of film is wrapped around a metal sled, in such a way as not to produce wrinkles on the surface. This weighted sled is then pulled across the surface of another sheet of film. The amount of force required to initiate movement and sustain it is then recorded.

The results of this test are used to determine the slip properties of film.

Elongation is the amount of stretch, recorded as a percentage, a film sample will reach at a breaking point compared to the toughness sample length

This percentage is a barometer of the toughness of film.

Unrestrained Shrink

Determines the amount of uninhibited shrink potential, shown as a percentage, a film sample has at a specific temperature. A swatch of film is immersed in a hot liquid for a specified time period, following which the shrink percentage is recorded in both directions.

This test is a gauge of a film&#;s ability to conform to a package.

Haze is the property of a film to scatter light and cause it to have a cloudy appearance. An incandescent light source is placed behind a film sample and geometrically located photocells behinds the film record the scattered light.

Film gauge has a bearing on test results and should be noted along with test data.

The brightness or sheen of a film. A light source is aimed at a specific angle at the film and a photosensitive receptor records the amount of light reflected.

Gloss is a good indicator of the cosmetic retail appeal of a film.

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ASTM D882 is a fundamental standard used to assess the tensile properties of polyolefin shrink film.

Compliance involves measuring tensile strength, elongation at break, and yield strength.

POF shrink film must meet the specified requirements for these properties to be considered compliant.

ASTM D882 POF Shrink Film Testing Procedure:

Sample Preparation: To initiate the test, a representative sample of the POF film is carefully prepared, ensuring it adheres to the specific dimensions and requirements outlined in the standard.

Test Machine Setup: The prepared sample is placed in a specialized testing machine, which is often equipped with grips designed for secure clamping.

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Application of Tensile Force: In this test, tensile forces are systematically applied to the grips. The film begins to stretch at a constant rate until it reaches a point of failure, or breaking.

Data Collection: During the test, crucial parameters are continuously measured and recorded. These parameters include the applied load (force) and the elongation (increase in length) of the film as it stretches.

POF Shrink Film Tensile Strength Test

Key Parameters:

Tensile Strength: This represents the maximum load that the plastic sheet can withstand before breaking. It is typically reported in units such as pounds per square inch (psi) or megapascals (MPa).

Elongation at Break: This measures the percentage increase in length of the plastic sheet at the point of failure.

Yield Strength: This is the point at which the material begins to deform plastically under the applied load.

Modulus: ASTM D882 can also be used to determine the elastic modulus of the material, which characterizes its stiffness.

Significance for Polyolefin Shrink Film:

In the context of POF shrink film, ASTM D882 holds significant importance for various industries, particularly in packaging.

POF shrink film is frequently used for bundling and protecting products, and understanding its tensile properties is crucial for selecting the right material for packaging applications.

The test provides critical insights into how well the film can withstand mechanical stress and stretching forces during handling, bundling, or shrink wrapping.

In essence, ASTM D882 is an invaluable tool for evaluating the tensile properties of POF shrink film.

KEEPTOP&#;s Polyolefin Shrink Film can be categorized into Economy Polyolefin Shrink Film, Standard Polyolefin Shrink Film, and Cross Linked POF Shrink Film according to different tensile properties.

This test offers essential information about the film&#;s response to stretching forces, which is pivotal for selecting materials that can withstand mechanical stress, ensuring the safe and effective packaging of various products.

Compliance with this standard guarantees that the film meets the necessary requirements for its intended applications.

ASTM D882 is also an important test standard for stretch film.

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