Most of the spicy soybean sauce packets available now come in standup screw-top pouches. The flexible upright pouch, which is more affordable than bottles and jars, can shield the soybean sauce from oxygen and moisture throughout distribution and transit thanks to a blend of several plant-based and fossil chemical film ingredients. For environmental reasons, VMPET is frequently utilized in the packaging of several types of soybean sauces. Additionally, to meet consumer demands for branding and sales, two sides of the standup bags will be emblazoned with imaginative artwork.
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 committed to producing narrative standup screw cap bags that boost sales and build a positive brand reputation.
We hope that this page will serve as a reference for your goods by analyzing the precise elements used in this 400g soybean sauce screw cap bag.
Ok, let’s get into the details of this standup screw cap spout bag.
Packaging Foil Materials
This foil material has a reinforced structure with excellent properties for soybean sauce packages. The foil structure is BOPP18/VMPET/LDPE, and the graphic is as below.
It is made of triplex layers, with the outside BOPP film of 18 microns working as the print substrate film, the VMPET film of 12 microns working as the middle supportive and barrier layer, and finally, the LDPE film working as the inner sealing layer. The thickness of the LDPE film should be adjusted to suit the requirements of 400g soybean sauce.
Next, let’s get a deeper understanding of each substrate film material.
BOPP18 Film
BOPP18 film is short for biaxially orientated polypropylene film, which is one of the most common print substrates in flexible packaging.
Biaxially oriented films have many advantages, including:
- Clarity: Biaxially oriented films are of ultra-clarity for printing purposes.
- 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 400-gram soybean sauce spout bag, 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, which is the most used inner sealing layer for standing soybean sauce 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 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 BOPP/VMPET/LDPE foil.
Great Standup Effect
The BOPP18/VMPET12/LDPE90 triplex foil laminate has sufficient rigidity to provide 350 grams of soybean sauce products with an acceptable standup profile. You will have a practical grasp of the standup effect by watching the video below.
Mechanical Property
During filling, transportation, and distribution, the soybean sauce product will be safeguarded by the spout packaging. The spout package will never be permitted to shatter in the event of an emergency, such as an unanticipated delivery shock or packages tumbling from the products’ shelves. Is it possible that the floor or cartons might become contaminated by the leaking soybean sauce?
In our production facility, the upright sachet’s mechanical properties are of utmost importance. To ensure that every order is completed with the desired outcome, our QC system takes serious precautions.
In short, the drop test is one of the most accurate methods to determine if a packed package will break when subjected to abrupt, sharp pressures.
When the volume goes bigger, there will be higher requirements for the mechanical strength of this spout bag, and we may need to change the foil structure, like PA/VMPET/LDPE for packs around 500ml, NY/LDPE or PET/NY/LDPE for packs around 1000ml.
At present, we are outputting the standup spout pouch with a maximum volume of 5 liters, mainly for restaurant purposes. This 5-liter spout pouch is of excellent bag strength, and you can have a further understanding through the below video to show our drop test.
You may reach out to us with 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.
According to experience, the soybean sauce partial packets have to be light-shielding in order to preserve the formula’s functionality. The primary purpose is to stop light from hastening the oxidation process, which breaks down oil and results in taste loss. Thus, it is essential to make sure that the soybean sauce is stored in a dark, light-free environment in order to prolong its shelf life and preserve its flavor.
To prolong its freshness, the soybean sauce product will also be protected from moisture and oxygen. Please remember that the laminated foil’s barrier quality is only one of the steps done to extend the shelf life of items made with soybean sauce.
You can easily find out the typical values of moisture vapor transmission rate and oxygen transmission rate of this multilayer foil 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 |
So, some reinforced foil structures are better protections for the freshness and flavors, with some available items listed below.
- PA/VMPET/LDPE
- PET/VMPET/LDPE
- PET/AL/LDPE
You may reach us for further ideas on each foil structure if you need any assistance.
Technical Data Sheet of 400 grams soybean sauce screw cap pouch
Here, we attach the specification sheet of this 400 grams soybean sauce screw cap pouch based on foil laminate 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 BOPP/VMPET/LDPE laminated foil, you may just 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 juice 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 chili sauce, with the list 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, 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.
In recent years, we have created a few spout pouches using single resin film materials that work well for items that contain soybean sauce. It is recommended that the maximum volume of these recyclable pouches be kept under 250 ml, given the mechanical strength of the materials currently in use.
Ok, let’s end here, you may reach us if you have any questions, nice day.
