Blue Film Plastic Liquid Packaging Bag With Valve

Food grade blue film liquid pouches with valves are a leak-proof, easy-to-access** packaging solution for liquid products such as food, spices, health care and other products that require aseptic filling, precise flow control or contamination prevention.  
1. Product features  
Food-grade safety: in line with GB/T18454-2019 and other food contact material standards, no plasticiser, no risk of heavy metal migration.                                  
Valve leakage prevention: one-way valve/spring valve design to prevent liquid leakage and external contamination
Protected from light: blue outer film reduces the effect of light on light-sensitive liquids (e.g. olive oil, nutrient solution).  
Convenient access: Press, squeeze or pump head to control the flow rate and avoid waste.
2. Valve types and application scenarios 
Valve type Feature Applicable food liquids 

One-way valve: allows only liquid to flow out, prevents air backflow, aseptically fills sauces, nutritional liquids, high-end cooking oils. 
Spring-loaded valve (squeeze valve): press the liquid out, let go of the self-closing, anti-drip condiments (oyster sauce, ketchup), honey, jam 
Screw valve (can be connected with pump head) can be connected with dosing pump head, precise control, high-end edible oil, liquid health care products, fruit juice concentrate. 
3. Typical applications 
Condiments: oyster sauce, soy sauce, vinegar, salad dressings.  
High-end edible oils: olive oil, walnut oil.  
Liquid health products: collagen liquid, probiotic drink.  
Sauces/jams: ketchup, honey, chocolate sauce.  
(Dairy products: liquid milk, yoghurt) 
4. Filling and Storage Requirements 
Filling method: aseptic cold filling/hot filling (valves need to resist high temperature).  
Storage suggestion: store in a cool place away from light, with the valve facing upwards to prevent leakage.  
5.Applicable customer groups 
 Seasoning manufacturers (leak-proof packaging needs)  
 High-end edible oil brands (avoid light + accurate access)  
 Health care product companies (aseptic liquid filling)  
 Sauce/dairy manufacturers (extended shelf life)