Standup side gusset bags are a large part of the sunflower seed packs in the current market. With a flexible combination of various polymer and biopolymer film materials, the side gusset pouch can prevent the sunflower seeds from moisture, grease, and oxygen during transportation and distribution and is more cost-effective.As an eco-friendly consideration, VMPET is widely used in the packages for various chili sauces. Moreover, two sides of the standup bags will be printed with creative artwork to satisfy customers’ needs for branding and sale.
As a well-known flexible packaging manufacturer located in Qingdao, China, we are making the best use of the packaging 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
We are devoted to creating story-telling packages that increase product sales and establish a good brand image.
In this post, we will analyze the exact materials of this 250-gram sunflower seeds standup side gusset pouch, hoping it could serve as a reference for your products.
Ok, let’s get into the details of this standup side gusset bag.
Packaging Foil Materials
It is made of triplex layers, with the outside Matte BOPP film acting as the print substrate film, the VMPET film acting as the middle supportive and barrier layer, and finally, the LDPE film acting as the inner sealing layer. The thickness of the LDPE film should be adjusted to suit the requirements of 250 grams of sunflower seeds.
Next, let’s get a deeper understanding of each substrate film material.
Matte BOPP Film
Matte BOPP18, or matte biaxially oriented polypropylene, is a polymer film with a matte finish that absorbs light instead of reflecting it. With a matte finish effect on the outside, Matte BOPP film is widely used to improve visual effects and add a fashionable touch to the packaging.
Biaxially oriented films have many advantages, including:
- Strength: They have high tensile properties and improved toughness
- Flexibility: They are more flexible
- Barrier properties: They have improved barrier properties
- Shrinkability: They can be made relatively easily shrinkable
VMPET Film
VMPET film is short for vacuum metalized polyester film, which is achieved under vacuum conditions to deposit a thin layer of aluminum atoms onto the surface of PET (polyester) film substrate, and finally realize a bright metallic film that is also widely used in flexible packaging and standup pouch packages. For this 250 grams sunflower seeds side gusset pouch, VMPET film can provide enough barrier performance for the product, at a much lower cost than aluminum foil.
LDPE Film
LDPE film is short for low-density polyethylene film, the most used inner sealing layer for standing side gusset bags. LDPE is also lightweight, easy to fabricate, and has good chemical and impact resistance. LDPE is recyclable and reusable, making it a popular alternative to traditional plastic. LDPE is nontoxic, non-contaminating, and has a high degree of break resistance. Most importantly, LDPE membrane can be modified against the requirement of specific products, and finalize the package with great seal strength and protection. The thickness of the LDPE membrane film will be decided against the particular application.
The property of the LDPE film should be modified to resist the alkaline corrosion of the liquid detergent. Different formulas of detergent liquids may require a particular modification of the low-density polyethylene film. If you need further assistance, you can reach out to us.
The customer artwork is printed reversely on the inner side of the first Matte BOPP film layer in the gravure printing system. These 3 layers are bonded together into a finished laminated foil material under the dry lamination or solvent-free lamination process. Usually, we describe the finished laminate as Matte BOPP/VMPET/LDPE foil.
Thickness
As you can see in the below picture, the overall thickness of this spout pouch is 0.345 mm, which equals 345 microns for this laminated foil.
Usually, we describe the finished laminate as Matte BOPP/VMPET/LDPE foil. So, how does this foil structure perform when it is intended for standup sunflower seed packs? Will it break during the distribution?
Great Standup Effect
This triplex foil laminate Matte BOPP18/VMPET12/LDPE90 is of enough stiffness to provide a good standup profile for 250 grams of sunflower seed products. Through the video below, you are going to have an actual understanding on the standup effect.
Mechanical Property
The package structure will protect the sunflower seed product during filling, transit, and distribution. Under the emergency circumstances of unexpected shock in delivery or packages falling off the goods shelf, the food package will never be allowed to break.
The mechanical property of this standup sachet is the top priority in our manufacturing plant. Serious measures are taken in our QC system, to assure each order is finalized with the expected result.
To put it simply, a drop test of a filled package is one of the most reliable ways to check if the package may burst under sudden sharp forces.
Ok, You may reach us for further ideas if you have any questions.
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.
Upon experience, the partial packages for sunflower seeds should be light-shielding， the main reason is that sunflower seeds contain more oil, under light conditions, especially long-term strong light irradiation, easy to causes oil oxidation, and odor, affects the taste and quality of sunflower seeds. Moreover, light and heat may also promote the breakdown of nutrients such as vitamins in sunflower seeds. Therefore, it is necessary to ensure that the storage environment of the sunflower seeds is dark and away from light, which can effectively extend their shelf life and maintain their flavor.
Furthermore, the sunflower seed product will be kept from oxygen and moisture, to stay fresh as long as possible. However, please keep in mind that, the barrier property of this laminated foil is just a part of the measures taken to ensure the shelf life of sunflower seed products.
You can easily find out the typical values of moisture vapor transmission rate and oxygen transmission rate of this multilayer foil Matte BOPP18/VMPET12/LDPE90.
| Item | Standard | Unit | Typical Value |
| Water Vapor Transimission Rate | ASTM E 96 | g/m2/24hr | 0.85 |
| Oxygen Transmission Rate | ASTM D 372-99 | cc/m2/24hr | 1.2 |
Some customers may like to get superior packages with better barrier properties. In this case, the VMPET layer can be replaced by a thin aluminum foil sheet, So, some reinforced foil structures are better protections for the freshness and flavors, with some available item structures below.
- Kraft Paper/Aluminum/LDPE
- MatteBOPP/Kraft Paper/Alu/LDPE
- Kraft Paper/PET/Aluminum/LDPE
You may reach us for further ideas on each foil structure if you need any assistance.
Technical Data Sheet of 250 grams sunflower seeds side gusset pouch
Here, we attach the specification sheet of this 250 gram sunflower seeds side gusset pouch based on foil laminate Matte BOPP/VMPET/LDPE.
More tests are included in this specification sheet with items available listed as below.
- Yield (grams per square meter)
- Tensile Strength (Mpa)
- Elongation Rate (%)
- Coefficient of friction, short as COF
- Solvents Left (mg/m2 )
- Sealing Strength (N/15mm)
- Sealing Conditions
- Bond Strength (N/15mm)
- Burst Strength (J)
- Anti-Puncture ability (N)
- Drop Test Ability (cm)
- Anti-pressure ability (kgs)
- Water Vapor Transmission Rate (g/m2/24hr)
- Oxygen Transmission Rate (cc/m2/24hr)
If you want to get a further understanding of this Matte BOPP/VMPET/LDPE laminated foil, you may just read it here.
More Sustainable Materials Options
In recent years, along with the increasing burden of fossil-chemical polymer materials discarded into our environment, there has been an increasing focus on using more sustainable materials. there is an unprecedented demand for sustainable packages which leads to a more eco-friendly activity of the business. Upon the recent investigation of the nut market, more and more consumers are more likely to purchase a product that acts toward environmental sustainability.
Compostable Packaging Materials
For example, Kraft Paper is already a relatively sustainable option as it is made from renewable wood pulp. In addition, the compostable packages are based on plant-based fibers like cellulose, or bio-mass like corn starch, cassava, or sugarcane. The resins derived from these resources are usually named bio-polymer, which can break down into inorganic elements under the functions of algae, bacteria, and other microorganisms.
At present, we have developed several compostable foil materials that can be intended for nuts, with list as below.
- Cellulose/Metallized Cellulose/PLA+PBAT Film
- Cellulose/Metallized Cellulose/PBS Film
- Kraft Paper/Metallized Cellulose/PLA+PBAT
Fully Recyclable Mono Materials
Compared with the high cost of compostable foil materials, fully recyclable materials sachets, and rolls are flooding the market for lightweight product packages in the market at much lower prices. Mono materials packages mean each layer of the multi-layer foil is made of the same resin, which can be easily processed in the human recycling system and reused for other applications. This recyclable materials sachet largely reduces the rate of plastic polymer film packages ending in landfills.
Nowadays, we have developed some standup pouches based on single resin film materials, that can be found good application for roasted almond products.
Ok, let’s end here, you may reach us if you have any questions, Have a nice day.