What Is a PE Coated Sheet

PE Coated Sheet is a paper that has been coated with polyethylene to make it water-resistant. This paper is suitable for a variety of packaging applications.

It can be printed with high-quality graphics, making it a good choice for business marketing materials. It also has low water vapor transmission rates, which helps to protect the contents from moisture and other contaminants.

Durability

Durability is a key attribute that can protect the product from moisture and other elements. This property is vital for packaging and printing materials, especially those that will be stored and shipped long distances. This feature is also important for products that require a high level of protection, such as medical supplies and industrial equipment.

The seal strength of PE-coated paper is very high. It can withstand rough handling during shipping and storage, which makes it ideal for use in food packaging. It also has good printability, and it can be customized with custom designs and branding.

PE-coated paper is usually extrusion-coated onto a base material using a cold pressure nip. This process causes a percentage of the paper fibers to become incorporated into the PE film, which reduces the amount of paper that can be recovered for recycling. This issue can be addressed with quality control measures and testing methods. Ultimately, this will lead to better recycling and reuse of PE-coated paper.

Heat Sealability

The heat sealability of PE-coated paperboard is important for food packaging and medical labels. Its low water vapor transmission rate prevents contamination and damage to medical equipment and products. It also reduces the likelihood of water vapor absorption by the product. In addition to offering barrier properties, the PE coating on these papers also allows them to be printed with high-quality graphics.

The ability of the PE-coated paper to heat seal is largely determined by its material structure, grammage, densification, and amount of PE coating. In addition, the sealing temperature and dwell time are critical factors. According to the results of the Force-Displacement tensile test, the peel strength of both PE-coated and dispersion-coated paper increased with increasing seal temperature. However, when the sealing temperature was above 130degC and the dwell time was 0.5 s, both materials experienced delamination of the coating layer at the seal interface. Afterward, the material began to coarsen and shrink, resulting in a weaker hot-tack.

Moisture Resistance

Moisture resistance is a critical feature in many paper packaging applications. It is a crucial factor in guaranteeing the safety of packaged foods. It is achieved by incorporating specific coating techniques into the paper manufacturing process.

These papers are made of bleached kraft or corrugated fibers with polyethylene coating on one side. They are a great choice for use in food packaging, as they prevent "freezer burn" and maintain their chemical inertness. They also maintain their strength in cold temperatures and can be dispensed, sealed, or wrapped as easily as any other roll of paper.

The PE coating on these papers attaches firmly to the paper, making it difficult to recycle them. This issue can be addressed by using nanofibrillated cellulose (NFC) suspensions as a release layer between the paper and the PE. This technique allows the PE to be separated from the paper using a hydro pulping machine. This increases the quality of recycled paper and reduces environmental pollution.

Printing

Unlike uncoated paper, which can easily damage or become damp when exposed to moisture, PE-coated papers provide excellent water and grease resistance. They are ideal for products that require minimal or zero exposure to liquids and humidity, including paper cups, paper salad bowls, and disposable food containers. They also prevent “freezer burn,” maintain chemical inertness, and have no odor.

This type of paper is designed for printing high-quality graphics and offers a glossy surface that enhances the colors and contrasts of printed images. It is suitable for use with solvent, UV, and Latex inks, and provides superior results without cockling or curling.

To ensure the quality of PE-coated papers, manufacturers conduct a series of tests on their finished products. These include examining the material’s thickness, weight, and water resistance. Additionally, they inspect the raw materials used in production to ensure that they meet the necessary specifications. They also monitor the manufacturing process to make sure that it is working properly.