Why Does Packaging Lack Airtightness (Leaking / Bloating)?
答：
Problem Description: Food and pharmaceutical packaging may experience air leakage or package swelling during storage or transport, leading to the oxidation, spoilage, or moisture contamination of the contents. This typically results from dust particles trapped within the heat-seal area, uneven heat-sealing pressure or temperature, or the presence of microscopic pinholes in the packaging material itself.
Solution:
Leakage Testing (Leak Tester): Employ either the vacuum decay method or the underwater micro-crack detection method (Blue Ink Method). The test specimen is immersed in water within a vacuum chamber; a vacuum is then applied to create a pressure differential between the interior and exterior of the sample. By observing whether a continuous stream of bubbles is emitted, the precise location of any leaks can be accurately identified.
https://www.linktesting.org/903.html/leakage-tester/
Heat-Seal Strength Testing: Utilize an electronic universal testing machine to measure the peel strength at the seal interface (measured in N/15mm). This data is used to optimize the heat-sealing parameters—specifically temperature, pressure, and dwell time—on the bag-making machinery, thereby ensuring the robustness and integrity of the seal.
https://www.linktesting.org/891.html/heat-seal-tester-lth-h3/
Why Does Packaging Collapse During Transport (Insufficient Compressive Strength)?
答：
Problem Description: During warehouse stacking or logistics transport, corrugated cardboard boxes and packaging containers may undergo deformation, crushing, or collapse—potentially even damaging the internal contents—due to exposure to compressive forces, moisture absorption, or vibration.
Solution:
Full-Box Compression and Stacking Testing: Utilize a box compression tester to conduct "fixed-pressure deformation" and "crush" tests. By simulating long-term stacking conditions—setting specific load parameters and durations—the dynamic and static compressive load-bearing capacities of the boxes can be accurately assessed.
https://www.linktesting.org/884.html/carton-compression-tester-kyj-10k/
Material Upgrading and Structural Design: Based on the data obtained from compression testing, adjust the corrugated board's paper configuration (e.g., by increasing the basis weight or Ring Crush Strength of the liner and facing papers) or optimize the box structure (e.g., by altering the length-to-width ratio or adjusting the flute profile combination).
https://www.linktesting.org/5407.html/paper-crush-tester-hsd-01a/
Why Do Automated Packaging Lines Experience Jamming or Breakage? (Issues Related to Friction Coefficient and Tensile Properties)
答：
Problem Description: When roll-stock film runs on high-speed automated packaging lines, it frequently encounters issues such as slippage, lateral deviation, and irregular feeding—often resulting in jams—or suffers from frequent breakage on the machine due to insufficient tensile strength, thereby severely compromising production efficiency.
Solution:
Coefficient of Friction (COF) Testing: Utilize a friction tester to measure the film's dynamic and static coefficients of friction (typically required to be controlled within the range of 0.2 to 0.4). An excessively high COF (indicating the film is too "tacky") leads to irregular feeding, whereas an excessively low COF (indicating the film is too "slippery") makes it prone to slippage and lateral deviation.
https://www.linktesting.org/880.html/coefficient-of-friction-tester-ltcof-05a/
Tensile Strength and Elongation Testing: Employ a universal testing machine to measure the film's tensile breaking stress and yield strength, ensuring that the material possesses the structural integrity to withstand the mechanical tension exerted during the bag-forming, filling, and sealing processes on the automated packaging line.
https://www.linktesting.org/7007.html/automatic-tensile-tester-xlw-500n/
Why Barrier Performance Did Not Meet Standards (Shortened Shelf Life)？
答：
Problem Description: The packaging surface appears physically intact; however, the shelf life of the internal product—such as highly oxygen-sensitive foods or moisture-absorbent pharmaceuticals—falls significantly short of expectations, exhibiting premature oxidation, discoloration, or caking.
Solution:
Gas/Moisture Permeability Testing (Barrier Analysis Instrumentation): During product development and incoming raw material inspection, utilize the isostatic method or coulometric method to measure the material's Oxygen Transmission Rate (OTR), and employ the gravimetric method or infrared sensor method to measure its Water Vapor Transmission Rate (WVTR).
https://www.linktesting.org/5377.html/ltwtc-303h-water-vapor-transmission-rate-tester/
Process Optimization: Based on the test data, evaluate whether an upgrade to high-barrier materials is necessary (e.g., by incorporating barrier layers such as laminated aluminum foil [Al], EVOH, or PVDC), and strictly monitor the interlayer bonding strength (peel strength) of the composite film.
https://www.linktesting.org/3852.html/gas-permeability-tester-gtc-203h/
Why Does Moisture Absorption Cause a Drastic Drop in Carton Strength? (Carton Collapse in High-Humidity Environments)
答：
Problem Description: When exposed to cold chain logistics environments (such as cold storage facilities or refrigerated trucks) or during rainy and humid seasons, cardboard boxes tend to absorb moisture from the air, causing them to become soft and pliable. A mere 1% increase in moisture content can lead to an 8% to 10% reduction in compressive strength, making the boxes highly susceptible to widespread collapse.
Solution:
Water Absorbency Testing (Cobb Method): A water absorbency tester (Cobb tester) is used to evaluate the surface water absorption properties of the box's linerboard. A lower Cobb value indicates superior moisture resistance and water-proofing capabilities in the linerboard.
https://www.linktesting.org/4295.html/cobb-absorption-tester-ltkbxs-01/
Moisture Content Monitoring: High-precision paper moisture meters are employed to monitor the moisture levels of both raw paper stock and finished boxes in real-time prior to shipment, ensuring strict adherence to standard ranges (typically 8% to 12%). For packaging intended for use in high-humidity environments, it is recommended to subject the boxes to a "high-humidity environment pretreatment" (specifically, an alternating damp-heat test) before conducting compressive strength evaluations.
