A Complete Guide to Choosing PE Valve Bags: Match Your Needs Precisely, Avoid Purchasing Mistakes, and Improve Packaging Efficiency

Step 1: Match the Material Characteristics

1. Material Form: Powder vs. Granules

• Granular materials: Low ventilation requirements; choose thickened, puncture-resistant PE (single or double-layer) if particles are sharp to prevent bag breakage.

• Powder materials: High ventilation and moisture-proof needs to avoid bulging, leakage, and caking.
• If the transportation conditions is unfavorable? Do we need to add anti-slip materials or increase the strength of the PE bags?

2. Moisture-Proof Requirements

• Ordinary needs: Single-layer PE valve bags are cost-effective for daily storage and short-distance transport.
• High needs: Composite PE valve bags (e.g., PE+PE, PE+aluminum foil) block water vapor and protect materials from deterioration.

3. Ventilation & Moisture-Proof Balance

4. Bag Layers

• 1-layer: The thickness of the bag needs to be increased to 180 microns, with a load capacity of 25 kilograms. Some models may require the addition of a special exhaust system, known as "Miaqi Gong" exhaust. Normally granules is ok. Square valve pocket
• 2-layer: Suitable for color masterbatches, coatings, and powders that require differential venting. According to customer requirements, different bag shapes are adopted. Generally, they are not square-bottomed.
  
• For EVA bags, since their inherent strength is low, they are usually made in double layers. This type of bag is suitable for thermoplastic materials, road marking paints, injection molding tire factories, sole factories, conveyor belt manufacturers, basically all those related to rubber, and departments that can directly input materials.
• 3-layer+: For >50kg materials with high moisture-proof and puncture-resistant needs.

Step 2: Adapt to Filling Equipment

1. Manual Filling

2. Automatic Filling

• Precise adaptation to Haver&Boeker, ensuring stable heat sealing and high filling efficiency.
• • Solves the problem that powder such as PVC resins adheres to the valve port, ensuring the valve port can still perform ultrasonic heat sealing well.
• Fast heat sealing, strong sealing performance, and long durability.

Step 3: Avoid Common Mistakes

1. Don’t pursue thickness blindly; choose layers based on material needs to save costs.
2. Don’t ignore valve quality; prioritize hard plastic valves for stable sealing.
3. Don’t overlook equipment compatibility; confirm fit with filling machines (e.g., Haver&Boeker) in advance.