Standup doy packs are a large part of the packs for roasted almonds in the current market. With a flexible combination of various polymer and biopolymer film materials, the standup pouch can prevent roasted almonds from moisture, grease, and oxygen during transportation and distribution, and be more cost-effective. As for eco-friendly consideration, kraft paper is widely applied in the packages for various roasted almonds
Moreover, all sides of the standup bags will be printed with creative artwork to satisfy customers’ needs for branding and sale.
Located in Qingdao, China, we are a well-known flexible converter that uses the best film materials available on the market, which are stated 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 creating story-telling standup bags that increase the sales of roasted almonds.
In this post, we will analyze the exact foil materials of this 150-gram roasted almonds standup bag to provide assistance to customers in their market.
Laminated Foil Materials
This foil material is a reinforced structure with excellent properties for roasted almond packages. The foil structure is Matte BOPP18/Kraft Paper 60g/VMPET12/LDPE50, with a graphic as below.
Next, let’s get into a deeper understanding of each substrate film material.
Matte BOPP
Matte BOPP is short for matte finish biaxially orientated polypropylene film with the most common thickness of 18 microns (equal to 0.72 gauge). In our terms, we name it Matte BOPP18. It is a polymer film with a matte finish that absorbs light instead of reflecting it, to improve visual effects and add a fashionable touch to the packaging. Compared to matte lacquer coating, it can achieve a matte finish at a relatively lower cost.
Kraft Paper
Kraft paper is a lightweight, cost-effective, and eco-friendly packaging film material widely applied in flexible packaging, which can be well intended for a wide range of products, like foods, snacks, roasted almonds, coffee beans, pharmaceutical items. Made from wood pulp and plant fiber, kraft paper is biodegradable and home compostable in natural conditions.
The natural color of kraft paper is usually brown, of course, with some color tolerance like red, hazel, as of the different woods. White kraft paper appearance will be achieved after the bleaching process, which is highly appreciated by many roasters.
VMPET
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 moisture 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
LDPE means low-density polyethylene film, which is the most used inner sealing layer for roasted almonds bags. It is able to provide enough sealing strength and airtight properties for the final packages. 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.
Thickness
The paper pouch for 200 gr roasted almonds is composed of multiple layers with specific thicknesses. The customer artwork is printed reversely on the inner side of the first Matte BOPP film layer in the gravure printing system. The Matte BOPP18 layer has a thickness of 18 microns. This layer provides a certain degree of smoothness and surface protection. The Kraft Paper layer offers strength and a natural, rustic look. The VMPET layer, which is crucial for barrier properties, and the LDPE50 layer with a thickness of 50 microns contribute to the overall thickness and functionality of the pouch. Then, these 4 layers are bonded together into a finished laminated foil material under the dry lamination or solvent-free lamination process. The combination of these different thicknesses of layers works together to create a pouch that can hold the almonds effectively and protect them from external factors.
Usually, we describe the finished laminate as Matte BOPP/Kraft Paper/VMPET/LDPE foil. So, how does this foil structure perform when it is intended for standup roasted almonds doy packs? Will it break during the transit?
Great Standup Effect
The structure of Matte BOPP18/Kraft Paper/VMPET/LDPE50 gives the paper pouch an excellent standup effect. This great standup profile not only makes the product more visible and attractive to consumers but also allows for better utilization of display space in supermarkets. It gives the pouch a professional appearance, enhancing the overall presentation of the 200 grams roasted almonds.
Of course, the thickness of a finished foil influences the standup effect of this nut pouch after being filled. The thickness of the LDPE film used in this foil laminate is 50 microns, with the overall thickness of this Matte BOPP18/Kraft Paper 60gsm/VMPET12/LDPE laminated foil around 165 microns.
Excellent Airtight Property for Zipperlock
This single-track plastic zipper is applied onto the kraft paper doypack, with the back and front parts well melted to the inner layer of the doypack. It enables the package to be repeatedly opened and closed with great airtight properties. The zipper will be sealed with the inner LDPE film, to achieve the re-sealability on the paper pouch. By keeping out oxygen and moisture, the airtight zipper lock helps to preserve the flavor, crunchiness, and nutritional value of the almonds, ensuring that consumers can enjoy them in the best possible condition.
Here, we are going to open and close the zipperlock several times, and check if the air is easy to penetrate into or out of the package. Usually, we will apply a certain pressure on this closed zipper doypack, and check if the inflated doypack is easy to burst.
You are advised to have a further understanding of this test progress through the video below.
Good 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 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 250 grams of coffee beans into this kraft paper foil pouch, perform drops 5 times, and check if there is any breakage for the package.
Barrier Performance
The VMPET layer is a key component for barrier performance. It offers an effective barrier against oxygen, moisture, and light. Oxygen can cause oxidation of the almonds, leading to rancidity and a loss of flavor. Moisture can make the almonds soggy and affect their texture. Light can also degrade the quality of the almonds over time. The VMPET layer, in combination with the other layers, significantly reduces the permeation of these harmful elements, thereby extending the shelf life of the roasted almonds and maintaining their quality and taste.
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 common substrate film materials.
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.
| Item | Standard | Unit | Value |
| WVTR | ASTM E 96 | g/m2/24hr | 1.05 |
| OTR | ASTM D 372-99 | cc/m2/24hr | 0.95 |
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, with some foil structures as below.
- Kraft Paper/Aluminum/LDPE
- MatteBOPP/Kraft Paper/Alu/LDPE
- Kraft Paper/PET/Aluminum/LDPE
This foil material proves to be working well for roasted almonds and snack products distributed around the country.
Technical Data Sheet of 200 gr roasted almonds standing bag
Here, we attach the specification sheet of this 200 grams roasted almonds bag based on foil laminate Matte BOPP18/Kraft Paper 60gsm/VMPET12/LDPE50.
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 get a further understanding of this Matte BOPP/Kraft Paper/VMPET/LDPE laminated foil, you may just read 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.