There are packaging pouches for everything nowadays. Because of their structural and design variations, many kinds of packing bags serve distinct purposes. In today’s thriving packaging sector, choosing the appropriate pouch bag may improve the brand image in addition to protecting the products inside.
So, let’s look at the three most popular types of seal bags available today: 4-side seal bags, 3-side seal bags, and back-seal bags.
3-Side Seal, 4-Side Seal, & Back-Seal Pouch Comparison
The main difference between 3-side, 4-side, and rear seal bags is how they are sealed and how much packing capacity they provide. 4-side seal bags have all four sides sealed, forming a completely enclosed pouch, while 3-side seal pouches feature three sealed sides along with one open for filling. Back seal bags, which come in a flat pouch form with a gusset or just a stand-up option, are sealed along the back.
Here are some more thorough comparisons.
4-Side Seal Pouch/Bag
The 4-sided bag’s production process is a little different. For packaging, a full film is often split equally in half. It is part of the process that involves cutting each bag separately after heat-sealing the overall bag. Its structural properties are determined by this bag-making process. In other words, a square look is finally created by sealing all four sides. The four symmetrical and smooth corners provide a clean and good visual impression.
The 4-side seal bag creates a three-dimensional impression and is very stable. It is difficult to collapse or distort, and it may keep its package shape. The sealing capabilities are likewise outstanding, successfully keeping out dust, moisture, and outside air. It works well for packing liquids and semi-liquids like mayonnaise, barbeque sauce, other food items, cosmetics, and other products that need airtight seal, and a high-quality storage environment.
Its big printing area and smooth surface allow you to completely show product information and beautiful designs, improving the product quality. Having said that, 4-side seal bags are more expensive and need a more complex manufacturing procedure.
- Sealing on all four sides makes it more durable and airtight.
- Provide enhanced vacuum finishing, protecting the product, and ensuring quality.
- Not often seen with gussets. Comes with the option to add valves, handles, or zippers.
- Depending on the design, the shape might be either stand-up or flat.
- Made typically from materials that include polyvinyl chloride (PVC), polyethylene (PE), and polypropylene (PP).
- Excellent for dry products, liquids, powders, gels, and anything else that needs a strong barrier.
- Strong sealing for a variety of uses, providing outstanding protection against air and moisture.
- Provides more packing capacity than 3-side seal packaging.
3-Side Seal Pouches
The 3-side seal bag manufacturing technique is comparatively advanced. After the plastic film is trimmed to size, three of its edges are heat-sealed, leaving one open to allow product filling. Ultimately, the cutting procedure creates a single packing bag.
Because of their multiple practical uses, 3-side seal bags have quickly become the go-to for many. Moreover, there are a number of ways that 3-side seal bags may be developed to meet product needs. Also, a 3-side seal bag may be made in various ways depending on the needs of the product, such as by including easy-tear openings to make opening easier for customers. The addition of a self-sealing zipper will allow for several reuses.
- Three sides sealed, and one opening for filling and resealing.
- Flat, pillow-shaped, with gusset or stand-up option.
- Gusseted for higher packing capacity than a 4-side seal, easy to open and fill.
- For convenience, they may have zippers, punches, or spouts.
- Adaptable to a wide range of goods, from both food and non-food products to single-serve containers.
Even so, 3-sided closure bags have limits. Because it is only sealed on three sides, the bottom of the pouch might bulge and distort while containing irregular or heavy things, affecting its look and presentation. In addition, a 3-side seal bag has a poor rate of internal space usage while the dimensions are fixed. Increasing the bag size could be necessary to pack some high-capacity items, which would increase the price.
Back-Seal Bags
Beginning with a longitudinal half-fold of the plastic sheet, the back is heat-sealed to create a cylindrical shape, and then the top and bottom ends are sealed to complete the back-seal bag manufacturing process.
The back-seal bag has great promise in real-world applications. The sturdy back-seal bag it comes in can withstand a lot of pressure. Printing logos, product details, and nutrition statistics on the flat front is a great way to get people to buy your product. Products with a big capacity, like liquid and powder laundry detergent, may be packaged in fewer units, which in turn reduces transportation and storage expenses.
At the same time, back-seal bags may be mass-produced at a rate of dozens, if not hundreds, of units per minute. It’s more than enough to meet the needs of businesses in large-scale manufacturing.
- Comparable to 3-side seal bags, but with the opening for filling on the front and the seal on the back.
- Sealing back creates a stand-up or flat pouch with gusset choices. Depending on the design, they may be either stand-up or flat.
- Excellent package capacity, particularly gusseted.
- Perfect for bigger portions of sweets and candies or smaller, single-serve portions.
- Ideal for food goods and customizable with zipper closures, punches, or spouts.
- Typical material types such as BOPP, PET, kraft paper, and PLA.
- Compact and flat, ideal for displaying and stacking.
Nevertheless, back-seal bags also have its flaws. When packing very fluid or granular objects, there is a chance of inadequate sealing due to the lack of a second rear edge. In addition, back-seal bags have a set form, thus, they don’t suit items that have specific package design needs.
Conclusion
To sum up, there are benefits and drawbacks to using a 4-side seal bag, a 3-side seal bag, or a back-seal bag. In real-world scenarios, retailers will choose the ideal packing bag for their products by considering product features, sales goals, and available funds.
Regardless of whether you choose 4-side seal, 3-side seal, or back seal bags, our spout pouch filling capping machine and pouch packaging machine are capable of handling all three types! For more information on our packaging machinery, please contact us and send us a message. We love to hear from you!
