How is the seal integrity of a package tested?
答：
Seal integrity is critical, especially for food and pharmaceutical packaging. Common testing methods include:
Vacuum Decay (Bubble Test): The package is submerged in water and placed under vacuum. A continuous stream of bubbles indicates a leak point. The common test instrument is LTY-01. You can check the website Leak Tester LTY-01_Container Packaging Testers_Link Testing Instruments co. ,Ltd
Pressure Decay (Positive Pressure): The package is pressurized with air, and the pressure drop is monitored over time to detect leaks. You can check the website Intelligent Sealing Instrument LTMFY-06S_Film & food Packaging Testers_Link Testing Instruments co. ,Ltd
Dye Penetration Test: A colored dye is introduced to the package, and after applying pressure, external surfaces are inspected for signs of the dye. You can use the same instrument with the vacuum decay tester.
Applicable Standards: ASTM D3078, ASTM F2095, GB/T 15171.
How is the compression strength of packaging measured?
答：
Compression strength is a key quality indicator for corrugated boxes, plastic drums, and other containers. The test method is as follows:
Box Compression Test (BCT): The empty or filled package is placed between two platens of a compression tester. It is compressed at a constant speed until deformation or failure occurs. The maximum force sustained is recorded. You can check the website Carton Compression Tester KYJ-10K_Film & food Packaging Testers_Link Testing Instruments co. ,Ltd
Stacking Test: A defined load is placed on top of the package for a set period (e.g., 24 hours) under specified environmental conditions to simulate warehouse stacking. The test machine is the same with BCT. You can check Carton Compression Tester KYJ-10K_Film & food Packaging Testers_Link Testing Instruments co. ,Ltd
Applicable Standards: ASTM D642, ISO 12048, GB/T 4857.4.
How is print quality on packaging evaluated?
答：
Print quality affects both brand image and scannability (e.g., barcodes). Key tests include:
Color Difference: A spectrophotometer or colorimeter is used to measure the color deviation (ΔE) from the standard sample. You can check the website KBT-D65A Double Light Source Viewer_Film & food Packaging Testers_Link Testing Instruments co. ,Ltd
Abrasion Resistance: A rub tester is used to simulate friction during transport, and ink transfer to an adjacent surface is assessed. You can check the website Rub Tester MCJ-05_instruments_Link Testing Instruments co. ,Ltd
Adhesion: A tape test (e.g., with 3M tape) is performed where tape is applied to the printed area and quickly removed to check for ink flaking or peeling.
Barcode Quality: A barcode verifier is used to assess parameters like contrast, edge determination, and modulation to ensure the barcode meets grade requirements (e.g., ISO/IEC 15416).
Applicable Standards: ASTM D5264, ISO/IEC 15416, GB/T 7705.
How is the bond strength of laminated films tested?
答：
Bond strength (or peel strength) measures the adhesion between layers in multi-layer flexible packaging. The method is:
T-Peel Test: A sample of the laminate is manually separated at one end to create tabs. The tabs are clamped in a tensile testing machine and pulled apart at a constant speed (typically 300 mm/min). The average force required to peel the layers is recorded (e.g., N/15mm). You can use the tensile tester to complete the test, please check the website Automatic Tensile Tester XLW-500N_Adhesive Testers_Link Testing Instruments co. ,Ltd
Applicable Standards: ASTM F904, GB/T 8808.
How is barrier performance (e.g., oxygen and moisture transmission) tested?
答：
Barrier properties are critical for extending the shelf life of products. Common methods include:
Gas Transmission Rate (GTR) : Measured using a coulometric sensor (equal-pressure method, ASTM D3985) or a pressure differential method (ASTM D1434) you can check the website Gas Permeability Tester GTC-203H_instruments_Link Testing Instruments co. ,Ltd.
Water Vapor Transmission Rate (WVTR) : Measured using a gravimetric cup method (ASTM E96, GB/T 1037) you can check the website WVTR （Water Vapor Transmission Rate Tester）LTWTC-203H_instruments_Link Testing Instruments co. ,Ltd or an infrared sensor method (ASTM F1249) you can check the website LTWTC-303H Water Vapor Transmission Rate Tester_Container Packaging Testers_Link Testing Instruments co. ,Ltd.
Common Units: OTR is often expressed in cm3/m2·24h·0.1MPa, and WVTR in g/(m²·24h).
