Why is the sealing performance of the packaging not good?
答：
* Common problem: The sealing area is prone to leakage, or bubbles appear during the pressure test, causing the product to get damp and leak air.
* The underlying cause:
Equipment factors: Inconsistent settings of heat sealing temperature, pressure or speed; aging or damage of the sealing ring.
Material factors: The thickness of the heat-sealing layer is uneven, or the penetration of ink or glue affects the heat-sealing effect.
Operational factors: There are wrinkles or contaminants at the sealing area.
* Solutions and Countermeasures:
Process optimization: The optimal sealing parameters (temperature, time, pressure) were determined through the heat sealing test instrument.
Daily verification: Use a sealed testing instrument (negative pressure method) to conduct random inspections on the finished products, and observe if there are any continuous bubbles appearing.
Why is the physical strength of the cardboard not up to standard?
答：
* Common problem: The cardboard box collapses after stacking (insufficient compressive strength)
* The underlying cause:
Material issue: Corrugated board deforms or has poor bonding strength.
Environmental interference: The cardboard box became damp, resulting in excessive moisture content and a sharp decline in strength.
Test misoperation: During the test, the box was not sealed and the guide block was not used, resulting in lower data results.
* Solutions and Countermeasures:
Source control: Conduct tests on the compressive strength and stacking capacity of the cartons.
Standard test: The sample must be pre-treated for 24 hours under the standard conditions of 23 ± 2℃ temperature and 50 ± 5% humidity before being tested.
Why are the hygiene and safety risks associated with packaging so high?
答：
* Common problem:The packaging has an unpleasant smell, or it has been detected that there are residual solvents or excessive levels of heavy metals.
* The underlying cause:
Material issue: Non-food-grade inks or adhesives were used, introducing impurities into the recycled materials.
Process issue: The drying process after printing or compounding is not thorough enough, resulting in excessive solvent residue (such as benzene, esters, etc.).
* Solutions and Countermeasures:
Compliance review: Ensure that the materials comply with the GB 4806 series standards (such as "National Food Safety Standard - Plastic Materials and Products for Food Contact").
Key indicator monitoring: The main indicators to be monitored include the total migration volume, the consumption of potassium permanganate, heavy metals (measured as Pb), and the total amount of solvent residues (typically required to be ≤ 5 mg/m²).
Why do packages rupture or leak in a low-pressure environment?
答：
* Common problem: During the low-pressure test conducted at an altitude of 4267 meters (approximately 14,000 feet), the ice packs of a certain cold-chain medication leaked and the temperature became out of control.
* The underlying cause:
The sealing strength of the ice pack is insufficient (measured at only 1.5N/15mm; the industry standard recommends ≥3N/15mm)
The low pressure causes the internal air to expand, and the sealed edges develop tiny cracks which gradually enlarge.
There is no buffer space between the ice pack and the box, which leads to an increase in pressure and a greater leakage.
* Solutions and Countermeasures:
Upgrade of sealing design: Utilize "aluminum foil + PE" composite film, double-layer heat sealing + serrated edge structure. The heat sealing width has been increased to 8mm, ensuring a strength of ≥ 4N/15mm.
Increase buffer space: Add a 0.5cm EPE buffer strip between the ice pack and the box body.
Why is the packaging inspection data unstable or with large deviations?
答：
* Common problem: After the temperature and humidity verification box has been operating under continuous high load for a period of time, the water pump suddenly malfunctions, and the humidity test paper detection is forced to be interrupted.
* The underlying cause:
The equipment has been operating for a long time without maintenance.
Component aging (pump body, sealing ring, sensor, etc.)
* Solutions and Countermeasures:
Moisture and rust prevention: Regularly inject the specified type of lubricating oil into the mechanical parts.
Electrical protection: Ensure insulation and temperature control, and reduce oxidation and aging.
Regular calibration: The measuring instruments are sent to the metrology department for verification on a regular basis.
