1.Nitrogen/filling gas-controlled packaging loses its vacuum and the gas ratio becomes unbalanced during the shelf life.
答：
Specific problem: Products such as nitrogen-filled potato chips, gas-controlled preservation chilled fresh meat, coffee beans, etc., experience changes in the gas ratio within the packaging during the shelf life (such as oxygen seeping in and nitrogen escaping out), which leads to product oxidation and deterioration, and a decline in preservation effectiveness.
Solution:
Headspace oxygen detection: Use a headspace oxygen analyzer to extract the internal gas through a probe inserted into the packaging, and detect the oxygen content using electrochemical sensors or fluorescence methods (down to 0.01%). Ensure the residual oxygen is ≤ 2% (depending on the product). The test can be conducted by the headspace gas analyzer(https://www.linktesting.org/2639.html/headspace-gas-analyzer-ltdk-190/)
Gas permeation rate test (OTR): Conduct oxygen permeation rate testing on the packaging material, using high-barrier materials (such as EVOH, PVDC coated film) to ensure OTR ≤ 5 cm³/(m²·24h·atm). The test can be conducted by the GTR (https://www.linktesting.org/3852.html/gas-permeability-tester-gtc-203h/)
Overall sealingity test (vacuum attenuation method): Place the packaging in a sealed chamber and evacuate the air. Determine if there is any minor leakage based on the pressure change rate (accuracy up to 0.1 cc/min), which is more sensitive and non-destructive than traditional water testing. The test can be conducted by the micro leakage tester(https://www.linktesting.org/8565.html/micro-leakage-sealing-tester-ltndl-v301/)
Packaging item pressure resistance test: Simulate the compression and stacking during transportation to check if the seal is damaged due to deformation.
2.The labels on the packaging bottles of daily care/cosmetics have lifted off and faded in color.
答：
Specific problem: The self-adhesive labels on packaging bottles of daily care products such as shampoo, body wash, and skin care products may warp, wrinkle, fall off, or have color bleeding during transportation and storage, which affects the brand image.
Solution:
Peel strength test (label): Use a tensile machine to test the force required to peel the label off the bottle body (unit: N/25mm) in a 90° or 180° peeling manner, ensuring that the initial adhesion and retention adhesion meet the standards. The test can be conducted by the tensile tester(https://www.linktesting.org/7007.html/automatic-tensile-tester-xlw-500n/)
Initial adhesion test (ball rolling method): Roll a steel ball over the adhesive surface of the label and measure the rolling distance when the steel ball stops to evaluate the initial adhesion speed of the label.
Retention adhesion test: Hang a specified weight of weights on the label and measure the time it takes for the label to fall off or peel off from the bottle body to assess the cohesive strength of the adhesive.
Aging resistance to moisture/temperature test: Place the labeled bottle body in a 40°C, 90% RH environment for 72 hours, or undergo temperature cycles from -10°C to 50°C, observing whether the label warps, falls off, or changes color.
Solvent wiping resistance test: Use alcohol or simulated daily care liquids to wipe the printed surface to evaluate the chemical corrosion resistance of the ink and prevent product spillage leading to color bleeding.
3.The blister packaging of the medicine has aluminum foil damage and poor shaping.
答：
Specific problem: The blister packaging (aluminum foil + PVC/PP substrate) for pills/capsules has aluminum foil pinholes, damage, or poor blister cavity formation (the blister cavity is too deep and becomes thin and breaks, or too shallow and cannot accommodate the pills). This affects the sealing performance and medication safety.
Solution:
Aluminum foil pinhole detection (light transmission method): Place the aluminum foil sample under a standard light source and visually inspect the number and size of pinholes. If the pinhole diameter is greater than 0.3mm, it is judged as unqualified. The test can be conducted by pinhole tester(https://www.linktesting.org/993.html/aluminum-foil-pinhole-tester-ltzk-02/)
Blister cavity depth/wall thickness measurement： Use a three-dimensional profilometer or thickness gauge to measure the depth and wall thickness distribution of the blister cavity after formation， ensuring that the pills have sufficient space to be placed and the wall thickness after formation is not less than 75% of the original thickness.
Heat sealing strength test (blister)： Use a tensile machine to test the heat sealing peel force between the aluminum foil and the PVC substrate (N/15mm)， ensuring a firm and uniform seal.The test can be conducted by the heat seal tester(https://www.linktesting.org/891.html/heat-seal-tester-lth-h3/)
Sealing performance test (positive pressure method)： Fill the blister cavity with air and apply pressure to detect if there is any gas leakage from the aluminum foil side. Determine if there are pinholes or damages in the sealing area. The test can be conducted by the intelligent sealing tester (https://www.linktesting.org/1225.html/intelligent-sealing-instrument-mfy-06s/)
Online visual inspection： Configure a high-resolution camera + AI image recognition to automatically detect defects such as blister skew， missing pills， broken blister， and aluminum foil damage， and remove the defective products online.
4.The PET/PP plastic bottles have deformed after being filled.
答：
Specific problem:
After hot filling, the liquid inside the bottle cools and contracts, creating negative pressure, causing the bottle to collapse. The bottle design (wall thickness distribution, position of reinforcing ribs) is unreasonable. The filling temperature does not match the crystallinity of the bottle material.
Solution:
Thermal deformation test: Place an empty bottle in a constant temperature oven and gradually increase the temperature to the filling temperature (such as 85~92℃), observing whether the bottle body undergoes irreversible deformation or contraction.
Bottle wall thickness distribution measurement: Use an ultrasonic thickness gauge to measure the wall thickness at multiple points along the bottle axis and circumference to ensure uniform wall thickness (typically requiring a bottle wall thickness of 0.25~0.35mm), avoiding local weak points from collapsing. The test can be conducted by the bottle wall thickness tester(https://www.linktesting.org/1665.html/wall-thickness-tester-chy-b2/)
Drop/impact resistance test: Drop the empty bottle or filled bottle freely from 1 to 2 meters to check if the bottle body has cracks, gaps, or permanent deformation.The test can be conducted by the fall dart impact tester(https://www.linktesting.org/856.html/ltmc-a-falling-dart-impact-tester/)
Negative pressure tolerance test: Apply negative pressure (vacuum) to the bottle interior to simulate the suction force caused by cooling contraction, observing whether the bottle body undergoes depression deformation, and verifying if its anti-negative pressure capability meets the standard. The test can be conducted by the leak tester(https://www.linktesting.org/903.html/leakage-tester/)
5.The heavy-duty packaging bags experienced bottom weld failure or cracking during loading and unloading.
答：
Specific problem: Heavy packaging bags (woven bags / paper-plastic composite bags) for 25kg of rice, feed, fertilizers, etc., during loading and unloading operations, the bottom sealing seams may come loose or the bag bodies may crack, resulting in a large amount of material leakage.
Solution:
Drop test (after filling): Place the filled packaging bags freely drop from a height of 1 to 2 meters onto the concrete ground, observe whether the bottom sewing thread or heat-sealed opening comes loose, and whether the bag body bursts (repeat 5 times for each height).
Tensile breaking load test: Take the bag sample, use a tensile machine to test the longitudinal and transverse breaking strength of the bag (N/50mm), ensuring it meets the corresponding grade requirements. The test can be conducted by the tensile tester(https://www.linktesting.org/7007.html/automatic-tensile-tester-xlw-500n/)
Hot sealing strength test (bottom sealing): Take a sample from the bottom sealing point, test the hot sealing peel force, ensuring the sealing strength is not lower than 80% of the bag base material strength. The test can be conducted by the heat seal tester (https://www.linktesting.org/891.html/heat-seal-tester-lth-h3/)
Stacking pressure resistance test: Stack the filled packaging bags to the actual warehouse height (usually 8 to 10 layers), store for 7 days, observe whether the bottom packaging bags have deformation, bulging or cracking. The test can be conducted by the box compression tester (https://www.linktesting.org/884.html/carton-compression-tester-kyj-10k/)
Anti-swing hammer impact test: Simulate the impact resistance of packaging bags being thrown or hit by hard objects during loading and unloading, especially for verifying the anti-cracking ability in winter low-temperature environments. The test can be conducted by pendulum impact tester (https://www.linktesting.org/868.html/auto-pendulum-impact-tester-ltjm-06/)
Sewing thread strength test: Conduct a tensile test on the bottom sewing thread to ensure the thread material's breaking strength meets the standard, the needle spacing is uniform (usually 8 to 10 stitches/10cm), and the sewing thread material has sufficient strength and wear resistance.
