3 Side Seal vs 4 Side Seal Sachet: Which Is the Better Choice for Your Brands?

Have you ever encountered this question when choosing packaging—3 side seal vs four side seal sachet, which is better?

This is a professional and detailed question. Although most consumers probably don’t pay much attention to these two types of packaging, it matters to health supplement and pharmaceutical manufacturers. However, when choosing the packaging format, many manufacturers encounter this question: if both can ensure complete sealing, what role does the extra seal play in health supplement sachet packaging?

That is exactly what this article aims to solve. We will guide you through a deep understanding of three-side seal sachets and four-side seal sachets, and provide insights for your production line packaging selection based on a comparison from a manufacturer’s perspective.

Key Takeaways

• Introduction of three side seal bag and 4 side seal pouches respectively
• Comprehensive differences between three-sided and four-sided seal bags
• A practical guide to selecting the right sealing format and insights into four side flat pouch market
• How Jinlu Packing’s VFFS machines overcome common production challenges with an advanced industrial sachet packaging solution

Understanding Three Side Sachets And Four Side Sachets

Just like tailoring a dress requires taking measurements, to make a decision on the package style, you’d better off understanding 3 sided seal pouch and 4 side seal pouch.

Three Side Sachets

Key Features:

• Simple structure, cost-effective: The biggest feature of a 3 side seal bag is that it is sealed on three sides. This design saves on film material.
• Suitable for single-use, small-dose packaging.
• Easy to open, high efficiency.

Four Side Seal Sachets

A 4 side seal sachet has all four sides sealed independently, completely enclosing the contents in the middle. The overall shape is more square and flat. The appearance is also more refined, and it is often used for products with high requirements for display effect and sealing integrity in pharmaceutical sachet packaging.

Key Features:

• Strong sealing performance: All four sides of the packaging are sealed, which means excellent sealing performance.
• Exquisite appearance, easy to showcase the brand: The overall packaging is flatter and more structured. The brand logo looks better on it.
• Suitable for high-speed automated production: The four-side-sealed sachet bag is more regular in shape, less prone to misalignment, wrinkles, or uneven stacking.

3 Side Seal Vs 4 Side Seal Sachet: Where Each Bag Works Best

Now that we have a basic understanding of bag structure, let’s move on to the next step and conduct a comprehensive comparison of the two bag types from the aspects that manufacturers care about most.

Table 1-A comprehensive Difference between 3 Sided Seal Sachet and 4 Sided Seal Sachet

In terms of material efficiency, 3 side sealed pouch is more advantageous for producing high-volume, common health products such as vitamin candies. This makes it a staple in everyday health supplement sachet packaging. Due to the massive production volume, even a one-cent saving in film material per bag can result in significant annual savings.

However, for products with high costs and stringent sealing requirements, 4 side seal sachet is the preferred choice. “While three side seal bag dominates the high-speed food industry, the pharmaceutical industry’s transition to active biological products demands the superior sealing performance for four side flat pouch market,” said Dr. Gerald Rostwa, a senior packaging compliance auditor.

How To Make The Right Choice For Production Boost?

Use 3 Side Seal Bag When:

• You are packaging high-volume granular supplements
• You need large-scale production of daily-use health supplements:

This format helps reduce film waste and boost your sealing speed.

Use 4 Side Seal Sachet When:

• You are handling highly moisture sensitive materials:

The full sealing of the 4 sided seal sachet can shelter the materials from the exterior moisture.

• You are packaging high-end products for single use:

This format endow the product with exquisite appearance which allows for brand presentation.

Sachet Packing Machine (VFFS): How It Works And Common Production Challenges

Although we understand the difference between three-side sealing and four-side sealing, when this issue is applied to the specific scenario of production, you’ll find it’s far more complex than you imagined. Determining the sealing method is only the first step; what truly matters in production is the ultimate automatic packaging solution that performs the sealing and packaging function, that is, the sachet filling and sealing machine.

How Does Sachet Packing Machine (VFFS) Work?

Choosing the right sachet packing machine for your specific liquid sachet packaging or powder sachet packaging needs is critical. To truly understand how to optimize production with vertical form fill seal sachet packing machine, one must understand this continuous workflow:

1. Film Stretching: The packaging roll is stretched out here to facilitate subsequent forming operations.
2. Forming:The packaging material is extruded into sachet or stick of a certain length by a mold.
3. Vertical Sealing:The packaging material passes through the heat-sealing station and the left and right sides are sealed first. For a three sided seal bag, this step is ignored, for the bottom has been folded.
4. Bottom Sealing (for 4-side seal sachet): The machine then heat-seals the bottom of the packaging to facilitate filling by the feeder. For a three sided seal bag, this step is ignored, for the bottom has been folded.
5. Filling: After the bottom of the sachet is heat-sealed, the material is fed into the top-opening sachet through a screw feeder.
6. Top Sealing: After filling, the machine heat-seals the top of the packaging bag.
7. Easy-tear Notch & Cutting: At this point, the heat-sealed sachet is in strip shape, and the machine’s cutter cuts it into individual sachet and stick pieces; easy-tear notch cutting according to the manufacturer’s requirements is also completed at this station.

Challenges In Production: Common Sealing Problems

When you make up your mind on the packaging format and are evaluating an industrial sachet packaging solution from a reputable sachet packing machine manufacturer, you need to take factors like operation, maintenance, precision into consideration. The following are some of the major issues that your machine need to tackle.

1. Complicated operation and parameter adjustment

Traditional button-based machines often require operators to manually adjust sealing temperature, bag length, filling speed, and cutting position one by one.

This not only increases the learning curve for new operators, but also makes recipe changeovers slow and prone to human error, especially on a strict 4 side seal sachet packaging line.

2. Difficult maintenance and time-consuming disassembly

Another common concern is maintenance complexity.

On some conventional machines, the auger structure, feeding tube, or sealing assembly requires multiple components to be removed before cleaning. So the time for maintenance or changeover may probably be more than two hours.

This is especially troublesome for pharmaceutical sachet packaging manufacturers that require frequent cleaning and product changeovers.

3. Film deviation and sealing misalignment

Film tracking drift is another major production headache in high-speed sachet lines.

When the film runs off-center, common problems include: wrinkled sachets, off-center cutting, printing registration errors, and even the machine shutdown.

These issues are usually caused by unstable film tension or roller misalignment.

Integrating A High-Quality VFFS Machine Into Your Production Line: How Jinlu Packing Addresses The Problem

Overcoming these complex, daily operational hurdles requires far more than just a high-quality equipment, what matters most is a reliable sachet packing machine manufacturer. Operating under rigorous 6S workshop management protocols and proudly boasting comprehensive ISO, CE, and cGMP certifications, Jinlu Packing is dedicated to provide both automatic packaging solution and considerate after-sales service.

Tailor-Made Machine Design: How Machine Pinpoints The Challenges

We understand that the debate over the 3 side seal vs 4 side seal pouch is only half the battle; successfully producing them flawlessly at scale is our exact area of expertise. Here is how our engineered solutions directly neutralize the common challenges mentioned above:

Considerate and Precision Machine Design

1. Convenient Operation and Adjustment: Our machines lie multi-lane 4 side seal sachet packing machines have PLC touchscreen control, servo drive adjustment;
2. Easy Maintenance: The screw adopts an integrated design, which can be disassembled in less than a minute; the external film receiving mechanism facilitates film replacement;
3. Precise Filling: Servo motor controls the filling amount, with an accuracy of 99%;
4. Cursor Alignment and Automatic Correction: Cursor alignment ensures accurate cutting; if the film is misaligned, the photoelectric sensor will detect it and automatically correct it.

End-to-End Service:

Beyond providing exceptional hardware, Jinlu Packing is deeply committed to ensuring your line never stops running with:

• Global after-sales network including Hong Kong and North America
• Flexible commissioning with both onsite and remote forms
• Complete documentation including FAT and technical manuals

Conclusion

The choice between 3 side seal sachet and 4 side seal sachet ultimately depends on production costs, production scale, and brand positioning. During the production stage, a good stick sachet packing machine is fundamental, while a thoughtful and trustworthy sachet packing machine manufacturer is even more valuable. If you are looking for a VFFS machine or industrial sachet packaging solution with complete after-sales service, please feel free to contact Jinlu Packing.

FAQs On 3 Side Seal vs 4 Side Seal Sachet

References
[1] MarketsandMarkets: Flexible Packaging Market Global Forecast to 2027.
[2] PMMI (The Association for Packaging and Processing Technologies): State of the Industry Report – Packaging Machinery.
[3] World Health Organization (WHO): Guidelines on packaging for pharmaceutical products.