Standup spout bags are one of the indispensable and important components of liquid food packages on the market. Standup spout package not only costs less than box packaging, but it is also convenient for transportation.
Based on a flexible combination of various polymer film materials, the foil materials can provide excellent barrier properties, protecting the liquid food from air, moisture, and light.
Besides, a creative artwork design can be printed on all sides of the standup packaging, including all the information for branding and sale, which makes the final package more attractive to consumers.
As a well-known flexible converter 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 standup screw cap bags for liquid food that increase product sales and establish a good brand image. In this post, we will analyze the exact foil materials of this 400 grams liquid food spout packaging, hoping it could serve as a reference for your products.
Now, let’s get into the details of this liquid food spout packaging film material.
Packaging Foil Materials
This foil material is a reinforced structure with excellent properties for liquid food packages. The foil structure is PA15/LDPE100, with a graphic as below.
The film material of the liquid food spout package is made of two layers, with the outside PA15 film working as the print substrate film, and the LDPE film working as the inner sealing layer. The thickness of the LDPE film should be adjusted to suit the requirements of 400 grams of liquid food.
Next, We will talk further about each substrate film material.
PA Film
PA15 is also known as nylon film. It has excellent mechanical strength, anti-puncture resistance and high barrier performance against oxygen. When applied to foil laminates, a final package with enhanced mechanical strength is usually obtained.
LDPE Film
LDPE means low-density polyethylene film, which is the most commonly used inner sealing film for multi-layer flexible packaging in various applications. It can provide enough sealing strength and airtight properties for the final packages.
LDPE is 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.
Thickness
The customer artwork is printed reversely on the inner side of the first PA15 film layer in the gravure printing system. Then, these 2 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 PA15/LDPE100 foil. So, how does this foil structure perform when it is intended for liquid food spout packages? Will it break during transit?
Excellent Airtight Property for Spout
- This package for the spout can keep the food well sealed after use, thus extending the shelf life of liquid food.
- The spout packaging can easily pour out the liquid food in the bag through the spout, and there will be no spill of liquid during use, which is very convenient.
- Spout bag packaging can be applied to a variety of products, such as powder, granules, liquids
- Spout bag packaging can be used for a variety of different products, such as powder, granular, liquid, and so on.
Great Standup Effect
PA15 is a strong film. The thickness of the LDPE membrane film will be decided against the particular application. PA is not only impact strength but also good tensile strength, so it can protect products well. It is widely used in liquid products. 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.
So, this package with a layer of PA15/LDPE100 film, this two-foil laminate is stiff enough to create a good standup effect for a package of up to 400 grams of liquid food.
Mechanical Property
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
The above tests are performed against each order, on customer requirements, and you may check the exact values of this foil material in the Technical Date Sheet part of this post.
In our daily QC work, there is a 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, and distribution. We perform a 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 400 grams of water into this PA15/LDPE100 foil, perform drops 3 times, and check if there is any breakage for the package.
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 nut product will be kept away from these two elements 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 nut products. The below table shows the typical value of the WVTR and OTR of this triplex foil laminate PA/LDPE.
With the mocon O2/H2O/CO2 permeation tester equipped in our laboratory, we are able to keep a closer eye on the barrier performance of each laminate foil produced in our manufacturing plant.
Through the below table, you can easily find out the typical values of moisture vapor transmission rate and oxygen transmission rate of common substrate film materials.
Against this foil laminate PA15/LDPE100, actually, it does not have high barrier performance, which can not protect the liquid food products in a good state for a long time.
| Item | Standard | Unit | Value |
| WVTR | ASTM E 96 | g/m2/24hr | 16 |
| OTR | ASTM D 372-99 | cc/m2/24hr | 25 |
WVTR and VTR Typical Values of PA15/LDPE100
To ensure great protection of the dry nuts from oxygen, and moisture, usually, a layer of metalized polyester film or aluminum foil sheet is applied in the foil structure, with some common foil structures as below.
- PA/VMPET/LDPE
- PET/AL/LDPE
- PET/AL/CPP
- BOPA/AL/CPP
- PET/VMPET/LDPE
We will always come to assist whenever you need help with this product.
Technical Data Sheet of 400 grams liquid food standing bag
Here, we attach the specification sheet of this 400 grams liquid food spout packaging on foil laminate PA15/LDPE100.
More tests are included in this specification sheet with items available listed 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 learn more about this PA15/LDPE100 laminated foil, you can read it here.
More Sustainable Materials Options
Along with the increasing burden of fossil-chemical polymer materials discarded into our environment, 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
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 liquid food, with the list as below.
- Cellulose/Metallized Cellulose/PLA+PBAT Film
- Cellulose/Metallized Cellulose/PBS Film
Fully Recyclable Mono Materials
Compared with the high cost of compostable foil materials, actually fully recyclable materials sachets, and rolls are flooding the market for lightweight product packages in the market at much lower prices. Mono material 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 spout pouches based on single resin film materials, that can be found in good application for liquid food products. Limited to the mechanical strength of current materials, the maximum volume for these recyclable pouches should be controlled under 250 ml.
Ok, Please reach us if you have any questions regarding dry nut pouches. Good day.
