Dart Impact Test Methods and Applications for Plastic Films

Introduction to Dart Impact Test

Understanding the Dart Impact Test Based on ASTM D1709

ASTM D1709 outlines two main procedures—Method A and Method B—to determine the impact failure energy of plastic films. These methods are based on the use of darts with different head diameters and drop heights:

• Method A uses a 38.10 mm hemispherical dart dropped from 0.66 m.
• Method B uses a 50.80 mm dart dropped from 1.52 m.

Both methods aim to determine the weight of the dart at which 50% of specimens fail, providing a reliable index of the material’s impact resistance.

Two testing techniques are permitted:

1. Staircase method – adjusts dart weight after each test based on pass/fail results.
2. Alternative technique – groups specimens in sets of ten and adjusts weight between groups.

Impact Resistance Testing for Packaging Applications

In испытание на ударопрочность, plastic film quality is assessed for its ability to withstand mechanical stresses during transportation, storage, and handling. Variables that affect results include film thickness, dart shape, surface finish, and fabrication method. These tests are essential for food-grade packaging film testing, where any puncture could compromise product safety and shelf life.

Why It Matters:

• Prevents packaging failure during transit.
• Ensures regulatory compliance for food and medical packaging.
• Optimizes material selection in R&D and QA processes.

Test Preparation and Environmental Conditioning

Accurate dart impact testing requires proper conditioning of specimens. Films should be equilibrated at 23 ± 2°C and 50 ± 10% relative humidity for at least 40 hours before testing. Additionally:

• Films must be free from wrinkles, pinholes, or folds unless testing those defects.
• Specimens must be properly clamped to avoid slippage during impact.
• Dart heads should be checked for imperfections before testing.

Performing the Dart Impact Test

Whether using Method A or B, follow these basic steps:

1. Select appropriate dart size and drop height.
2. Secure the film specimen with clamps.
3. Adjust dart weight (using incremental collars).
4. Release dart and observe failure.
5. Repeat based on chosen technique until statistical reliability is reached.

Data is calculated to determine WF (impact failure weight) using either direct calculation or probability plotting, as detailed in ASTM D1709.

Recommended Equipment: FALLING DART IMPACT TESTER FDT-01

For consistent and reliable results, the FDT-01 Испытатель удара падающего дротика from Cell Instruments is a top choice. It offers:

• Compliance with ASTM D1709 and ISO 7765-1.
• Interchangeable dart heads and drop heights.
• Automated control and statistical result output.
• Safe and efficient operation for food-grade packaging film testing and other materials.

This device is ideal for manufacturers, quality control labs, and research institutions looking to ensure packaging integrity and optimize film performance.

Applications Across Industries

While the dart impact test is most widely used in food packaging, it’s also applicable in:

• Medical device films
• Agricultural films
• Flexible electronics packaging
• Textile laminates
• Industrial wrapping films

These industries require materials with precise mechanical resistance, and dart impact testing ensures that specifications are consistently met.

Заключение

Сайт испытание на удар дротиком remains a cornerstone of plastic film evaluation, offering quantifiable and repeatable results under ASTM D1709. By following the proper testing procedures and using high-quality equipment like the Cell Instruments FDT-01, companies can maintain material quality, meet regulatory standards, and deliver safe and durable packaging solutions.

For professional and automated испытание на ударопрочность, especially for food-grade packaging film testing, trust Cell Instruments as your reliable partner in materials analysis.