In the rapidly evolving packaging industry, three-side sealed bags (3SSB) have emerged as a preferred packaging method for sectors such as food, pharmaceuticals, and electronics due to their unique design and efficient functionality. This article delves into the structural characteristics, application scenarios, production processes, and market trends of this innovative packaging technology.
In the rapidly evolving packaging industry, three-side sealed bags (3SSB) have emerged as a preferred packaging method for sectors such as food, pharmaceuticals, and electronics due to their unique design and efficient functionality. This article delves into the structural characteristics, application scenarios, production processes, and market trends of this innovative packaging technology.
Three-side sealed bags are packaging bags that are sealed on three sides through heat sealing, typically made from materials like PE, PP, or aluminum composite films. The fourth side (either the top or bottom) is closed after filling the contents using a sealing machine. Compared to traditional four-side sealed bags, three-side sealed bags reduce energy consumption in production and improve packaging efficiency.
1. Three-Side Seal Design
By pre-sealing the left, right, and bottom (or top) sides, a stable bag structure is formed. This design facilitates automation in the filling process, especially suitable for high-speed production lines.
2. Wide Range of Material Compatibility
- Food Grade: Moisture-proof, oxygen-resistant composite films can be selected.
- Industrial Grade: Puncture-resistant thickened PE material.
- Medical Grade: Specially made films meeting sterilization requirements.
3. Cost-Effectiveness Analysis
Compared to four-side sealed bags, there is a reduction of 15-20% in raw material loss, and a 30% decrease in energy consumption for the sealing process, making them particularly suitable for large-scale mass production.
1. Food Packaging Field
- Snacks: Nitrogen-filled freshness packaging for chips and nuts.
- Frozen Foods: Three-side sealed stand-up bags resistant to low temperatures (-40°C).
- Sauces: Aluminum-plastic composite packaging with an easy-open tear notch.
2. Industrial and Electronic Components
- Precision Parts: Anti-static three-side sealed bags.
- Chemicals: Multi-layer co-extruded film leak-proof packaging.
- Medical Devices: Packaging compatible with ethylene oxide sterilization.
1. Optimization of Bag Making Processes
Using linkage machines to integrate printing, laminating, and slitting processes, achieving a production capacity of 120-150 units per minute, which is a 40% increase in efficiency compared to traditional processes.
2. Quality Control Standards
- Seal Strength Test: ≥2.5N/15mm.
- Oxygen Transmission Rate: For food packaging, it should be ≤3cc/m²·day.
- Heat Sealing Temperature Deviation: ±2℃ precise control.
1. Sustainability Innovation
Global market data from 2023 shows a 67% increase in demand for biodegradable PLA three-side sealed bags, with some companies achieving 100% plant-based packaging mass production.
2. Intelligent Upgrades
- RFID tag embedded packaging.
- Temperature-sensitive color-changing ink indicator technology.
- Popularization of automatic metering and sealing integrated machines.
1. Clearly Define Usage Requirements
Select the film layer structure based on the characteristics of the contents (such as acidity, weight):
- For items weighing over 5kg: Suggested thickness ≥120μm.
- For greasy foods: An EVOH barrier layer is required.
2. Verification of Certification Standards
Ensure that suppliers have certifications such as ISO 9001, BRCGS, etc., and that pharmaceutical packaging meets USP Class VI standards.
Three-side sealed bags continue to drive innovation in the packaging industry, with their efficient production characteristics and wide applicability reshaping the packaging logic from food supply chains to industrial product circulation. As smart technologies and eco-friendly materials are deeply integrated, this packaging form will open up broader market spaces.