As one of the drafters of the national standards paper bag industry, Nanwangboasts industry-eading laboratories in its field. We have implemented internalquality control standards, including thorough audits of suppliers, testing of rawmaterials, and strict control over the production process. We have also set upa comprehensive traceability system for our products, which alows us to completequality tracing within just 2 hours.
Testing of raw materials
Physical indicators: Quantification, odor, folding strength, bursting strengthstiffiness, tensile strength, tear strength, smoothness, whiteness, opacity, paperdust, thickness, moisture, water absorption (COBB), fat acid resistance (the KITmethod and hot oil test), etc.
Food safety indicators: Fluorescent substances, consumption of potassiumpermanganate, heavy metal (calculated by Pb), arsenic, formaldehyde, overalmigration, microorganisms (3 items), etc.
Ink testing: Color, odor, PH value, heavy metals (multiple elements), etc.
Sealant testing: Viscosity, solid content, heavy metals (multiple elements), etc.
Product manufacturing control
Product control and management
14 tests for eco-friendly paper bags:
Printing ink dry friction resistance test, printing ink oil friction resistance test, drop teststatic load test, dynamic lifting test, handle strain relief test, flexing test, high-ow-temperature resistance test, fat resistance test, fluorescent substance test, sealingviscosity test, quantitative test, size measurement, and sealant strength test.
To accomplish the abovementioned tests, we use up to 660 paper bags per day.
Handle strain relief test
