Film packaging bags are mostly made with heat sealing methods, but also using bonding methods of manufacturing. According to their geometric shape, basically can be divided into three main categories: pillow-shaped bags, three-sided sealed bags, four-sided sealed bags. For brands looking for custom printed film packaging bags, the bag structure is also an important consideration.
Pillow-shaped bags
Pillow-shaped bags, also called back-seal bags, bags have back, top and bottom seams, making them have the shape of a pillow, many small food bags commonly used pillow-shaped bags to packaging. Custom printed pillow-shaped bags can be produced with different film structures depending on the packaging requirements. Pillow-shaped bag back seam to form a fin-like package, in this structure, the inner layer of film is put together to seal, seams protrude from the back of the bag being encapsulated. Another form of closure on the overlapping closure, where the inner layer on one side is bonded to the outer layer on the other side to form a flat closure.
The finned seal is widely used because it is stronger and can be used as long as the inner layer of the packaging material is heat sealed. For example, the most common laminated film bags have a PE inner layer and a laminated base material outer layer. And overlap-shaped closure is relatively less strong, and requires the inner and outer layers of the bag are heat-sealing materials, so not a lot of use, but from the material can save a little.
For example: non-composite pure PE bags can be used in this packaging method. Top seal and bottom seal is the inner layer of the bag material bonded together.
Three-sided sealed bags
Three-sided sealing bag, i.e. the bag has two side seams and a top edge seam. The bottom edge of the bag is formed by folding the film horizontally, and all closures are made by bonding the inner material of the film. Custom printed three-sided sealed bags can be made with different film structures according to packaging requirements. Such bags may or may not have folded edges.
When there is a folded edge, they can stand upright on the shelf. A variation of the three-sided sealing bag is to take the bottom edge, originally formed by folding, and achieve it by gluing, so that it becomes a four-sided sealing bag.
Four-sided sealed bags
Four-sided sealing bags, usually made of two materials with top, sides and bottom edge closure. In contrast to the previously mentioned bags, it is possible to make a four-sided sealing bag with front edge bonding from two different plastic resin materials, if they can be bonded to each other. Custom printed four-sided sealed bags can be made in various shapes, such as heart-shaped or oval.
Choosing the Right Film Packaging Bag Structure
Film packaging bags come in different sealing structures, and each design has its own characteristics. Pillow-shaped bags, three-sided sealed bags, and four-sided sealed bags can be selected according to the product, packaging material, sealing method, and presentation requirements.
For brands that need custom printed film packaging bags, the right structure also needs to work with the selected film material and sealing process. A suitable combination can help ensure reliable sealing, practical packaging performance, and a finished look that fits the product.
If you are developing a new packaging project or looking for a reliable film packaging bag manufacturer, working directly with an OEM/ODM supplier can make it easier to discuss bag structures, materials, printing, and production requirements before placing a bulk order.
Frequently Asked Questions
What type of film packaging bag is suitable for food products?
The right bag structure depends on the product, filling method, sealing requirements, and desired shelf presentation. Pillow-shaped, three-sided sealed, and four-sided sealed bags can all be used for different food packaging applications. A food-grade film packaging bag can also be specified according to the product's barrier and contact requirements.
Can custom printed film packaging bags be made for different product sizes?
Yes. Custom printed film packaging bags can be produced in different widths, lengths, structures, and sealing formats to suit specific products and filling equipment. This allows brands to develop packaging for different product weights or product lines while keeping the printed design consistent.
How should I choose the film structure for my packaging project?
Film structure should be selected according to the product's protection requirements, sealing method, and intended application. Moisture, oxygen, aroma, puncture resistance, and heat-sealing performance may all need to be considered. For custom film packaging, the material structure can be discussed together with the bag format and production process before manufacturing.
Are recyclable film packaging bags available for brands seeking more sustainable options?
Recyclable structures are available for suitable applications, including certain mono-material packaging solutions. The appropriate structure depends on the product and required packaging performance. Brands looking for recyclable film packaging bags should confirm the material structure, intended recycling stream, and applicable market requirements before production.
What should brands confirm before ordering custom film packaging bags?
Before production, buyers should confirm the bag structure, dimensions, material combination, artwork, printing method, sealing requirements, quantity, and delivery destination. For an OEM packaging project, confirming these details early can help reduce production issues and make the manufacturing and shipping process more predictable.
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HuizhouDingli Packaging Products Co.Ltd.
Post time: Feb-10-2023