What is Offline Coated PP Sheet Roll

Offline coated PP sheet roll refers to a sheet product that is coated outside the production line. Compared with online coating, offline coating has the following characteristics:

• Higher flexibility: Offline coating can coat different types of PP sheets, while online coating is usually designed only for specific sheet types.
• More adaptable: Offline coating can be customized according to different customer needs, while the customization degree of online coating is relatively low.
• Lower cost: For small batches or multi-variety coating needs, the cost advantage of offline coating is more obvious.

Advantages of offline coated PP sheet roll

Excellent mechanical properties: PP sheet rolls have good tensile strength and impact strength, which can meet the requirements of various packaging and industrial applications. Even at a thinner thickness, it can withstand a certain load and impact.

Excellent coating surface: The surface of the sheet roll is specially coated with a flat, smooth and uniform coating layer, which makes it have good printing suitability and can obtain clear and bright printing effects. In addition, the coating layer can also improve the sheet’s wear resistance, moisture resistance and chemical resistance.

Multiple colors and specifications: PP sheet rolls can provide a variety of colors and specifications to meet the needs of different customers and application scenarios. For example, common colors include white, black, transparent, etc., and specifications include thickness, width, length, etc.

Environmental protection and recyclability: PP sheet roll materials meet relevant environmental standards and regulatory requirements, can be recycled and reprocessed, and reduce the impact on the environment.

Process flow of offline coating PP sheet roll

The process flow of offline coating PP sheet rolls usually includes the following steps:

Substrate preparation: The PP sheet roll is cleaned, dried, etc. to ensure that the coating surface is clean and flat.

Coating preparation: According to the required coating properties, the coating is mixed and filtered in proportion.

Coating: The coating is evenly applied to the surface of the PP sheet using a suitable coating method.

Drying: The solvent in the coating is removed by heating or other means to cure the coating.

Rewinding: The coated PP sheet roll is rewound and packaged.

Offline coating coatings

A variety of coatings can be used for offline coating of PP sheet rolls, the most common ones are:

Water-based coatings: coatings with water as the dispersion medium, which have the advantages of environmental protection and non-toxicity.

Solvent-based coatings: coatings with organic solvents as the dispersion medium, the coating has good gloss and wear resistance.

Polymer coatings: coatings with polymer materials as the main component, the coating has good chemical resistance and weather resistance.

Offline coating methods

Common coating methods for offline coating of PP sheet rolls include:

Roller coating: Use a roller to apply the coating on the surface of the PP sheet. The roller coating method is suitable for coatings with lower viscosity, and the coating thickness is uniform and controllable.

Scrap coating: Use a scraper to scrape the coating on the surface of the PP sheet. The scraper coating method is suitable for coatings with higher viscosity, and the coating thickness can be adjusted according to the inclination angle of the scraper.

Flow coating: Sprinkle the coating on the surface of the PP sheet. The flow coating method is suitable for large-area coating, and the coating thickness is relatively uniform.

Application of offline coating of PP sheet roll

The application of offline coating of PP sheet rolls is very wide, including:

Packaging materials: After coating, PP sheets can be used to make food packaging bags, drug packaging boxes, cosmetic bottles, etc.

Building materials: After coating, PP sheets can be used to make waterproof rolls, floor coverings, wallpaper, etc.

Auto parts: After coating, PP sheets can be used to make automotive interior and exterior parts, etc.

Electronic products: After coating, PP sheets can be used to make circuit boards, capacitor housings, etc.