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ASTM F2029 Testing of Heat Sealing Performance for Food Flexible Packaging
Date: 2025-11-22Read: 28
Food packaging has become popular in the market with snack shops and fast food stores in the past two years, winning the love of children. However, the majority of snack packaging is poorly sealed, which affects the taste, and the failure of packaging sealing (such as leakage, swelling, oxidation and deterioration) is still the core quality problem that troubles enterprises. Fundamentally, it is mainly due to the out of control heat sealing process parameters, resulting in insufficient sealing strength or the presence of micro hole defects.
ASTM F2029 (Standard Test Method for Heat Sealing Strength of Flexible Coil Materials) has become an internationally recognized laboratory testing standard for scientific evaluation and optimization of heat sealing performance.
Recommended testing instrument: HST-01A heat sealing tester
Accurate control of three major heat sealing parameters
Temperature: determines the degree of polymer melting, typically ranging from 100-250 ℃;
Pressure: Ensure a tight fit of the material, with a recommended range of 0.1-0.7 MPa (approximately 100-700 kPa);
Dwell Time: The duration of contact between the hot head and the material, typically 0.5-3 seconds.
1. Sample preparation
Cutting food with PA/PE composite film as a 100mm × 200mm sample;
Equilibrate in an environment of 23 ℃± 2 ℃ and 50% ± 5% RH for 4 hours (refer to ASTM D4332).
2. Parameter setting
Initial parameters: temperature 160 ℃, pressure 0.4 MPa, time 1.5 seconds;
Through the touch screen input of the heat sealing tester, the system automatically preheats and stabilizes for 5 minutes.
3. Heat sealing operation
Lay the sample flat on the lower hot head, click "Start" or step on the foot switch;
The upper hot head is automatically pressed down, and the sealing is completed according to the set parameters. After cooling, it is removed.
4. Heat sealing strength test
Cut the heat sealed sample into 15mm wide test strips and use an ETT-A tensile machine to perform 180 ° peeling according to ASTM F88;
Record the average peel force (e.g. 8.2 N/15mm).
5. Parameter optimization and window determination
Adjust the temperature in a gradient of 10 ℃ (150 ℃, 160 ℃, 170 ℃...) and repeat the test;
Draw a "heat sealing strength temperature curve" to determine the optimal heat sealing window (such as 165-175 ℃).