I. Raw Material Safety
All raw materials used for custom printed food packaging bags, including films, inks, adhesives, varnishes and others, must comply with national food contact safety standards and be limited to food‑grade eco‑friendly materials. We prioritize eco‑friendly inks that are benzene‑free, ketone‑free, low‑odor, non‑toxic and harmless. The use of industrial inks, low‑quality adhesives and non‑food‑grade materials is strictly prohibited to fundamentally eliminate heavy metals, plasticizers and harmful volatile substances, ensuring safe, odorless packaging that does not contaminate food. All raw materials are inspected before warehousing, with test reports and conformity certificates kept on file to achieve traceability and thorough quality control.
II. Prevention of Harmful Substance Migration
During printing, the content of heavy metals including lead, cadmium, mercury and arsenic is strictly restricted, and the use of harmful additives such as bisphenol A and phthalates is banned. For oily food, cooked food, moist food and heat‑applied food, low‑migration inks are required to prevent harmful substances from transferring from the printed layer to food during storage, heating or refrigeration. Each batch of finished products undergoes safety testing to ensure compliance with food contact standards and protect consumer safety.
III. Hygiene Management and Printing Process
The ink film thickness is optimized with sufficient drying and curing to prevent the printed surface from discoloration, smudging, sticking or peeling. Production workshops are kept clean, dust‑free and odorless, with proper temperature and humidity to avoid contamination by dust, oil or chemicals. Processes are strictly regulated, and regular equipment cleaning and maintenance are carried out to prevent lubricants or cleaning agents from contacting food‑contact surfaces, ensuring hygiene and safety throughout production.
IV. Safe Structure and Design
We prioritize reverse printing, where patterns and text are printed on the outer layer while the inner pure film directly touches food for enhanced safety. For surface printing, food‑grade isolation varnish or composite film must be applied to form an effective barrier and avoid direct ink contact with food. We also reduce large solid printing areas to lower odor and migration risks and arrange graphic elements rationally.
V. Standard Compliance and Quality Assurance
Products strictly comply with Chinese national food safety standards (GB), and export products also meet EU and US FDA requirements. Before delivery, every finished product undergoes full inspection including adhesion test, odor test, hygiene test, oil and water resistance test, and abrasion resistance test. A complete quality control and traceability system is established, with records of all production and testing steps, to ensure custom printed food packaging bags are legal, safe and reliable for end users.https://www.heyuprinting.com/paper-bag/kraft-paper-bag.html