Flexible packaging rollstock has become an essential component across various industries, from food and beverage to pharmaceuticals, due to its versatility, cost – effectiveness, and lightweight nature. However, one of the critical aspects that often concerns both manufacturers and end – users is its barrier performance. As a flexible packaging rollstock supplier, we understand the significance of enhancing this performance to meet the diverse needs of our customers. In this blog, we will explore several strategies to improve the barrier performance of flexible packaging rollstock. Flexible Packaging Rollstock
Understanding Barrier Performance in Flexible Packaging Rollstock
Before delving into the improvement strategies, it is crucial to understand what barrier performance means in the context of flexible packaging rollstock. Barrier performance refers to the ability of the packaging material to prevent the passage of gases (such as oxygen, carbon dioxide), moisture, light, and other contaminants. For example, in food packaging, a good oxygen barrier can extend the shelf – life of perishable products by preventing oxidation, which can lead to spoilage, color changes, and loss of flavor. Similarly, a moisture barrier is essential to keep dry products dry and prevent the growth of mold and bacteria.
Material Selection
The choice of materials is the foundation for achieving excellent barrier performance. Different polymers have different inherent barrier properties.
High – Barrier Polymers
Materials like ethylene vinyl alcohol (EVOH) and polyvinylidene chloride (PVDC) are well – known for their high barrier properties. EVOH has outstanding oxygen barrier performance, especially under low – humidity conditions. It can significantly reduce the oxygen transmission rate (OTR) of the packaging, making it ideal for products that are sensitive to oxygen exposure, such as processed meats and cheese. PVDC, on the other hand, offers excellent barriers against both oxygen and moisture. It is commonly used in packaging products that require protection from both gas and moisture, like snack foods.
Multilayer Structures
Combining different polymers in a multilayer structure is another effective way to enhance barrier performance. By laminating or co – extruding polymers with complementary properties, we can create a packaging material that offers better overall protection. For instance, a structure might include a layer of polyethylene (PE) for its good sealability and mechanical properties, a layer of EVOH for oxygen barrier, and a layer of nylon for its puncture resistance. This way, each layer contributes to the overall performance of the packaging, providing a more comprehensive barrier.
Coating and Lamination Technologies
Coatings and laminations can further improve the barrier performance of flexible packaging rollstock.
Inorganic Coatings
Inorganic coatings, such as silicon oxide (SiOx) and aluminum oxide (AlOx), can be applied to the surface of the packaging material. These coatings form a thin, transparent layer that provides an excellent oxygen and moisture barrier. SiOx coatings are particularly attractive because they are transparent, which allows consumers to see the product inside the package. They also offer good chemical resistance and can be applied using techniques like physical vapor deposition (PVD) or plasma – enhanced chemical vapor deposition (PECVD).
Lamination with Metallized Films
Metallized films, typically made by depositing a thin layer of aluminum onto a polymer film, are widely used to enhance the barrier performance of flexible packaging. The aluminum layer acts as a barrier against oxygen, moisture, and light. Metallized films are often used in applications where light protection is crucial, such as coffee packaging. The lamination process can be done using adhesives or extrusion lamination techniques.
Process Optimization
The manufacturing process can also have a significant impact on the barrier performance of flexible packaging rollstock.
Extrusion and Blowing Processes
In the extrusion and blowing processes of making plastic films, factors like temperature, pressure, and the speed of extrusion need to be carefully controlled. For example, if the temperature is too high during extrusion, it can cause degradation of the polymer, which may lead to a decrease in barrier performance. By optimizing these process parameters, we can ensure that the polymer chains are well – oriented and the film structure is uniform, resulting in better barrier properties.
Sealing Process
The sealing process is another critical step. A poor seal can compromise the barrier integrity of the packaging. The type of sealing method (e.g., heat sealing, ultrasonic sealing) and the sealing parameters (such as temperature, pressure, and time) need to be carefully selected based on the type of packaging material. For instance, in heat sealing of a multilayer film containing EVOH, the sealing temperature should be controlled to prevent the EVOH from melting and losing its barrier properties.
Quality Control and Testing
Maintaining high – quality standards is essential for ensuring the barrier performance of flexible packaging rollstock.
In – house Testing
As a flexible packaging rollstock supplier, we conduct in – house testing using advanced equipment. Oxygen transmission rate (OTR) testing is commonly used to measure the amount of oxygen that can pass through the packaging material per unit area and time. Moisture vapor transmission rate (MVTR) testing is also carried out to assess the moisture – barrier properties. These tests are performed at different humidity and temperature conditions to simulate real – world storage and transportation environments.
Third – party Certification
In addition to in – house testing, we also seek third – party certification for our products. Independent laboratories can provide more objective and accurate assessments of the barrier performance of our flexible packaging rollstock. Third – party certifications can give our customers more confidence in the quality of our products and their ability to meet the required standards.
Environmental Considerations
In recent years, there has been an increasing focus on the environmental impact of packaging materials. While improving barrier performance is important, it is also necessary to consider the sustainability of the materials and processes.
Biodegradable and Compostable Materials
We are constantly researching and developing flexible packaging rollstock made from biodegradable and compostable materials that also offer good barrier performance. For example, polylactic acid (PLA) is a biodegradable polymer that can be used in combination with other biodegradable polymers or barrier coatings to create packaging materials with acceptable barrier properties. These materials can help reduce the environmental footprint of packaging waste.
Recycling and Reuse
Another aspect is to design packaging that is easy to recycle. By using fewer layers and more compatible polymers in the packaging structure, we can improve the recyclability of the flexible packaging rollstock. Additionally, promoting the reuse of packaging materials can also contribute to a more sustainable packaging solution.
In conclusion, improving the barrier performance of flexible packaging rollstock is a multi – faceted task that involves material selection, coating and lamination technologies, process optimization, quality control, and environmental considerations. As a flexible packaging rollstock supplier, we are committed to continuously innovating and improving our products to meet the evolving needs of our customers. Whether you are in the food industry, the pharmaceutical industry, or any other sector that requires high – performance flexible packaging, we have the expertise and the products to provide you with the best solution.
If you are interested in our flexible packaging rollstock products and would like to discuss how we can improve the barrier performance to suit your specific requirements, please feel free to contact us for a procurement discussion. We look forward to partnering with you to create high – quality, reliable, and sustainable packaging solutions.
Vacuum Bags References
- Introduction to Flexible Packaging Technology by E. R. Roncoroni
- Barrier Polymers and Structures for Packaging by Michael Rubino
- Handbook of Plastic Films: Technology, Properties, and Applications by Allan A. Klein
Dongguang County Sansheng Plastic Packaging Co., Ltd.
Dongguang County Sansheng Plastic Packaging Co., Ltd. is one of the most professional flexible packaging rollstock manufacturers and suppliers in China, also supports customized service. Welcome to buy advanced flexible packaging rollstock made in China here and get quotation from our factory. Quality products and low price are available.
Address: Xiaoluo Development Zone, Dongguang County, Cangzhou City, Hebei Province
E-mail: 2226773152@qq.com
WebSite: https://www.sanspackagingbags.com/
