Triangle Sandwich Cupcake Containers with Window

Sandwich packaging box

1. **Material selection**: Firstly, food-grade white card is chosen as the main material. Food-grade white card is a specially treated cardboard with good waterproof and oilproof performance, suitable for direct contact with food. Ensure that the selected material meets food safety standards and is non-toxic and harmless.

2. **Design and Printing**: The design can be made with a triangular window opening design, which shows the sandwich inside, increases the visual appeal, and makes it easy for customers to quickly understand the contents when purchasing. The window is covered with transparent food-grade biodegradable PET plastic film to keep the contents fresh. The printing layout can include company logo, product name and other information to enhance the brand image.

3. **Structural design**: The sandwich box adopts easy-folding design, the internal food-grade greaseproof paper can be used to wrap the sandwiches first, and the triangular design of the outer box makes the structure more stable and effectively protects the internal food from being squeezed and contaminated, which is environmentally friendly and hygienic. 

4. **Testing and Certification**: Before mass production, food Packaging Box safety testing, including but not limited to pressure resistance test, sealing test, microbiological testing, etc., to ensure that the product meets the relevant regulatory requirements.

5. **Packaging and Logistics**: Finally, during the packaging and logistics process, POF film plastic sealing is adopted, plus five boxes of hardened carton packaging, to ensure that the sandwich boxes can maintain their shape and integrity even during long-distance transport.