At present, valve bags are still relatively rare in the application of flour. The main reason is that valve bags are more expensive than packaging bags. Some baking powder, chicken powder, and high-grade flour are packaged in valve bags.
Advantages of valve bags: waterproof, anti-corrosion, one-sided breathability, good airtightness, environmental protection and biodegradability, suitable for high stacking, long-distance container transportation, etc.
Valve bag automatic packaging machines are widely used in chemical plants, plastics, dyes, architectural coatings, etc., and there are many complete models, ranging from automatic manual bagging to automatic automatic bagging and multi-process wheel automatic bagging.
Paper-plastic composite valve bag: It is made of woven bags (commonly known as needle-punched non-woven fabrics) as the sheet material, and is made by casting (cloth/film/paper composite is three-in-one);
Wrapping paper valve bag: It is made of packaging paper (packaging paper is mainly divided into imported packaging paper and domestic packaging paper). The number of stacked layers of packaging paper generally varies from one to six layers according to the main purpose, and the middle can be coated or PE film can be added.
PE valve bag: also known as heavy-duty valve bag, made of polyethylene film, the thickness of the film is generally between 8-20 threads.
Low-melting point valve bag: made of low-melting point polyethylene film, the thickness of the film is generally between 8-20 threads, suitable for large-scale production and use in chemical plants on production lines, which can reduce environmental pollution and improve employee labor efficiency.
Polymer valve bag: It has the printability of paper and the water-proofness and durability of plastic, and is a new material. Packaging printing of valve bags: generally one to four colors, up to eight colors.
The application of valve bags in flour is still in its early stages, but with the diversification of flour packaging methods and the improvement of flour requirements of milk powder buyers, medium and high-end flour will gradually use valve bag packaging, and this process may take a long time.
For packaging machine manufacturers in the fierce competition in the flour industry, the development of automatic valve bag automatic packaging machines has never been a new direction.