Side Sealing Bag Making Machine: Food Bag Types and Recommended Machines

People will encounter a variety of food packaging bags in daily life, different styles of bags have different names, such as three-sided sealed bags, center sealed bags and four-sided sealed bags, it may be difficult for novice packaging to distinguish between these, but because center seal and three side seal bags are the most commonly used, so in order to help you understand them, this article will explain the difference between these three types of packaging bags.Briefly describe the related production process and recommend the machine.

1.Center Seal Bags

Middle sealing bag, also known as back sealing bag or pillow bag, is a kind of packaging bag with a sealing edge on the back.

They are widely used in the food industry for packaging a variety of food products, including sweets and instant noodles.

The back sealing design of the centre sealing bag maximizes the integrity of the front design.By integrating packaging design as a whole, the packing image to keep the unity, the appearance of the beautiful and unique.

Both sides of the center seal bag have higher pressure resistance, significantly reducing the possibility of packaging damage.For the same size of the bag, the centre sealing bag can minimize the total sealing length and reduce the possibility of sealing cracking.

Center sealed pouch is often used in food packaging, because it can effectively keep quality and moisture, and small size, easy to carry.

2.Three side sealing bag

Foods that need vacuum packaging such as snacks, rice, tea and facial mask commonly used in supermarkets are usually packaged in three-sided sealed bags.The bag type of three-side sealing bag is relatively simple and common.

Three side sealing unilateral opening, leaving only one opening for the user to place the product, this design has the best sealing.This packing method is commonly used in vacuum bags, with excellent sealing, moisture retention and tightness.

In addition, the three-side sealing packaging material loss is low, excellent sealing performance, good heat insulation, low oxygen permeability and moisture permeability, moisture-proof, antifouling, radiation protection, anti-degradation, strong mechanical properties, bright and durable appearance, non-toxic and tasteless, in line with national standards.

The three-sided sealing bag is highly expandable and can be customized according to specific requirements.They can be equipped with resealable zippers, easy tear rings, and hanging holes for shelf displays.

3.Four side sealing bag

This kind of packing bag is heat sealed on all four sides after packaging.They are cube-shaped and are also known as self-supporting bags.They have excellent packaging quality, keep food fresh, and can be recycled many times.They use innovative printing technology to highlight the packaging design and brand image, creating a striking visual effect.

The four side sealing bag is resistant to cooking, moisture and has excellent vacuum performance.In addition to these characteristics of other packaging bags, its strong antioxidant and antistatic properties further protect the product from environmental damage and effectively extend the shelf life.

Edge Sealing Process and Recommended Machines

Different packaging bags require different edge sealing processes, which means that a single machine cannot produce multiple types of packaging bags.Different types of bags require different bag making machines.

1.Center sealed pouch making machine

The center sealed pouch making machine usually adopts a double-film unwinding system, with two rolls of film guided symmetrically. After the film is closed, the vertical sealing mechanism forms a back-center seal.Then, the transverse sealing and cutting units form a single packing bag.This process can minimize material consumption and achieve high speed production.

Advantages: Ideal for high volume production, reducing packaging material costs by up to 40% while maintaining print integrity. 

Recommended Machines: Click here to explore our center sealed pouch making machine

2. Three side sealing bag making machine

The three side sealing bag making machine usually adopts a single-layer film unwinding system, folding the film into a "U" shape.Vertical seals are used to seal the sides and horizontal seals are used to seal the bottom and cut the bag.

Advantages: Excellent sealing performance and customizable functions (such as resealable zippers).

Recommended Machines: Click here to explore our three side sealing bag making machine

3. Four Side Seal Bag Making Machine

Four side sealing bag making machines usually use two separate layers of film and heat seal on all four sides.This process requires accurate alignment and dual sealing systems (vertical and horizontal).They are often used in high-end packaging that requires high barrier protection, such as cooking bags and vacuum bags.

Advantages: excellent moistureproof and antioxidant properties, and reusable design.

If you need to know more about the machine, please send an inquiry or add a phone contact!

Conclusion

Choosing the right bag making machine depends on your packaging needs.The central sealing bag making machine is efficient and economical, the three-side sealing bag making machine is versatile, and the four-side sealing bag making machine provides excellent protection.Investing in a high quality bag making machine ensures that it remains scalable and competitive in the packaging market.