As shown in the picture above, this is a flat bottom pouch with a tab zipper with a capacity of 500 grams. This flat bottom bag is a commonly used type in food packaging. Combined with the packaging scenario of Ningxia goji berry shown in the picture, its core advantages in shopping malls are as follows:
- Good display effect, large storage capacity and more stable structure
- Display performance: the bag body is flat with multiple printable surfaces
- High ease of use: equipped with a side zipper design, which can be resealed repeatedly after opening.
As a well-known flexible converter located in Qingdao, China, we are making the best use of the film materials in the market, listed below.
- fossil chemical polymer films
- Aluminum foil metal sheet
- vacuum metalized film materials
- Ceramic film substrates
- plant-based biopolymer materials
- biodegradable film materials
- compostable substrate films
- Fully recyclable substrate films
In this post, we will take a closer look at the exact film structure used in the 500g China well-known goji berry block bottom bags. We hope this analysis can serve as a useful reference for your own packaging development.
Ok, let’s get into the details of this flat bottom goji berry bag.
Packaging Foil Materials
The figure below shows the composition structure of this laminated foil material used to convert this flat bottom goji berry bag.
Matte BOPP18, is short for matte finish biaxially orientated polypropylene film with most common thickness 18 microns (equals to 0.72 gauge). Compared to glossy BOPP film, it is able to achieve the final package with a fine matte visual appearance for the package at a lower cost.
VMPET12, means vacuum metallized polyester film with thickness 12 microns (equals to 0.48 gauge), is the most common used aluminum metallized films in flexible packaging field. It is with high barrier performance against mositure vapor and oxygen. The barrier performance will enable your coffee products well protected from the roaster warehouse to the consumer’s hand in a fine way.
LDPE film, means low density polyethylene film, which is the most used inner sealing layer for the coffee bag. It is able to provide enough sealing strength and airtight property for the final packages.
The final thickness for this foil laminate should be 120 microns, with tolerance +-5%. and the toughness of this foil will be enough to finalize good package profile for 500 grams of goji berry products.
Great Standup Effect
With the reinforced triplex laminated foil materials, the pouch is able to present exquisite standing effect when 500 grams of goji berry is filled. Through the below video, you can have an actual idea.
Excellent matte finish effect
Through the below video, you can see excellent matte finish effect with outer Matte BOPP film.
Excellent Airtight Property for Zipper lock
This single-track plastic zipper is designed for flat-bottom bags and is firmly sealed to the inner LDPE layer. It allows the pouch to be opened and closed repeatedly while maintaining excellent airtightness. This helps keep the goji berry fresh for a long time after the package is first opened.
Serious measures are taken in our QC work to check the airtight properties for the inner zipper, and you are advised to have a further understanding of this test progress through the video below.
Mechanical Property
First of all, this flat bottom pouch needs to be the best protection for 500 grams goji berry detergent powder in great shape during the filling, transport, handling and distribution process. This reinforced laminated foil is achieved with great mechanical strength, with some standard items as below.
- Tensile Strength
- Sealing Strength
- Anti-puncture Strength
- Burst Impact Strength
- Anti-pressure Property
Drop Test
In our daily QC work, there is an more easy and reliable method to check if the bag strength is enough to meet the various conditions in the operations of filling, transport, loading and unloading, distribution. We perform drop test against each order, of course, the standard for this drop test should be decided against customer needs.
Here, we are going to fill 1000grams of coffee beans into this side gusset bag, and the foil structure is Matte BOPP/VMPET/LDPE
Barrier Performance
Usually, the barrier performance of a multi-material laminate is evaluated by WVTR (short for water vapor transmission rate) and OTR (Oxygen Transmission Rate). The below table shows the typical value of the WVTR and OTR of the most common substrate films in flexible packaging.
More Sustainable Materials Options
With increasing burden on the plastic pollution, more and more products are now seeking for packages which are more sustainable, like compostable packages, recyclable mono materials packages, plant-based materials packages. They all proves to be more eco-friendly than the traditional multilayer packages which are even very difficult to be recycled.
Home compostable film material packages
Thanks to the fast development of plant-based film materials, now we are able to present the multi-layer standup pouch and roll foils in full home compostable options.
The compostable substrate films are as below.
- BOPLA Film
- PLA+PBAT Film
- Kraft Paper
- Metallized Paper
- Cellulose Paper
- Metallized Cellulose Paper
- PBS Film
Mono Materials Recyclable Pouch Packages
Mono-material pouch packaging is truly recyclable because it can be easily reprocessed into plastic granules and used again for new applications.
In contrast, traditional multi-layer laminates , for example PET/LDPE structures , are difficult to recycle. PET and LDPE are completely different materials and cannot be melted or reprocessed under the same conditions, which makes separation costly and inefficient. This is the key reason why mono-material pouch formats are gaining strong traction in the packaging industry and earning a positive reputation among consumers.
Currently, mono-material pouches are mainly available in two material directions: polyethylene (PE) and polypropylene (PP). Among them, the PE-based structure is the most widely adopted, as it can be converted into a variety of stand-up pouch formats with high mechanical strength, excellent sealing performance, and good overall barrier protection.
Now it’s the end. You are welcome to reach us if you have any questions regarding juice pouches. Have a nice day.
