1. Common packaging materials
Paper packaging

Kraft paper bags: environmentally friendly, good air permeability, suitable for short-term household or bulk flour, but poor moisture resistance.

Composite paper bags: inner layer coating (such as PE film), both moisture-proof and strong, commonly seen in supermarket pre-packaged flour.

Plastic packaging

Polyethylene (PE) bags: low cost, good sealing, moisture-proof and insect-proof, but poor environmental protection.

Polypropylene (PP) woven bags: wear-resistant and pressure-resistant, suitable for bulk transportation (such as 25kg/bag), but need to be matched with inner layer moisture-proof film.

2. Storage recommendations
Avoid light: UV rays will accelerate the oxidation of flour, so it is recommended to use opaque packaging.

Moisture-proof: Store in a sealed container, and place a desiccant or a moisture-proof inner layer.

Insect-proof: Store in a sealed environment or add food-grade insect-proof sheets (such as bay leaves).

Temperature: Store in a cool and dry place (15~20℃ is best), avoid high temperatures.

3.Block bottom valve woven bags (also called block bottom pp flour bag or block bottom bags) have significant advantages in packaging flour, especially in bulk transportation and storage scenarios.

Common specifications are 25kg and 50kg, which are suitable for large-volume transportation needs of flour mills, wholesalers or food processing companies.

4.Shijiazhuang Boda Plastic Chemical Co., Ltd. is a company specializing in the production of plastic woven bags and packaging materials, especially in the field of block bottom valve bags (block bottom valve woven bags) with rich experience and technical strength. The following is an analysis of the company’s advantages in the production of block bottom valve bags:

• Automated production line: equipped with modern woven bag production equipment, the whole process from wire drawing, weaving, laminating to printing and sewing is automated to ensure production capacity and consistency.
• Customization capability: supports flexible customization of different sizes (such as flour bag sizes :25kg, 50kg), printing patterns, and valve port designs to meet the diverse needs of customers.
• Food grade standard: The product meets the food packaging safety requirements (such as GB 4806.7-2016 China Food Contact Material Standard).
• Environmental certification: Some products may have environmentally friendly and recyclable characteristics, adapting to the trend of green packaging.
• International certification:pass ISO 9001 quality management system certification, and some export products meet European and American market standards (such as FDA, REACH, etc.).

flour packaging bags suppliers hebei shengshi jintang packaging co.,ltd .The company’s expertise and mature production system in the field of square bottom valve bags make it a reliable choice for packaging powdered materials such as flour. If you are interest of them, pls feel free to contact them.