May. 06, 2024
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The protective film is a material with surface protection functions and is a vital product in pressure-sensitive adhesives (PSA).
This film is usually made from polyolefin plastic film as the base material and acrylic polymer as the base resin of the pressure-sensitive adhesive, processed by a coating machine.
The real purpose of the protective film is to act as a temporary measure to prevent surface scratches during the storage, transportation, and circulation of goods or during the processing steps of the substrate.
The protective film is widely used for surface protection of aluminum panels, aluminum-plastic composite panels, mirror effect steel plates, color panels, plexiglass panels, decorative panels, aluminum profiles, plastic steel profiles, stainless steel coils, marble materials, and display screens.
Using protective film for aluminum profiles, typically made from polyethylene (PE) film with a specific formula and polyacrylic resin as the pressure-sensitive adhesive base, involves several adhesives coated, slit, and processed in packaging.
This film is soft, has good adhesion, is easy to apply, and easy to remove without any adverse effects on the aluminum profile’s surface.
Protective films are generally polyacrylate films. Their basic structure from top to bottom includes an isolation layer, printing layer, film, and adhesive layer.
Films usually use low-high-density polyethylene (PE) and polyvinyl chloride (PVC) as raw materials obtained by extrusion molding, injection molding, and blow molding. Polyethylene, especially, is preferred for its cost-effectiveness and environmental friendliness. Depending on the type of polyethylene, the melting points and densities vary.
The quality of the protective film largely depends on the characteristics of the colloid used. There are two main types of pressure-sensitive adhesives: solvent-based polyacrylate glue and water-soluble polyacrylate glue.
This type uses organic solvents to dissolve acrylic monomers. It’s known for its transparency, low initial viscosity, and excellent aging resistance, lasting up to 10 years under UV exposure. The glue can be applied directly after corona treatment without a primer.
This type utilizes water as a medium and shares similar properties with solvent-based glue but is more environmentally friendly and commonly used in developing countries.
Refers to the force needed to peel off the protective film from a surface after some time. Factors like the material of the surface, pressure, application time, angle, and temperature during removal impact adhesion level.
Measures the internal strength of the adhesive to prevent internal cracks and residue when peeling off the film.
The binding force between the adhesive and the film should be strong enough to prevent residual glue when the film is removed.
Polyacrylate glue is UV resistant, especially when UV stabilizers are added, lasting 3 to 6 months. This is tested using climate simulation equipment to mimic environmental changes.
Contact us to discuss your requirements for an aluminium protective solution. Our experienced sales team can help identify the best options to meet your needs.
The process involves polyethylene particles being pushed through heated drums to a round die head, blown into a film, and cooled by air. Different elongation properties in the film’s transverse and longitudinal directions are considered to ensure mechanical strength.
The corona-treated film can be directly coated with polyacrylate glue without a primer, followed by heating, cooling, and rolling.
Protective films are rewound to the required customer length and slit accordingly. They can be stored for up to 12 months at 30°C without direct sunlight, with higher temperatures reducing storage time.
Protective films are applied using a curved roll to avoid bubbles and wrinkles, with optimal conditions for unwinding and temperatures above 10°C. Proper handling ensures effective adhesion.
The protective film acts as a shield for the aluminum surface against damage during transport, storage, and installation, preserving its decorative appeal. Various aluminum treatments require different protective films with appropriate adhesives and viscosities for smooth, medium-rough, and rough surfaces.
The correct application of protective film on aluminum surfaces is crucial to avoid damage, ensuring the product retains its quality, facilitates further processing, and enhances the manufacturer’s brand image. Contact us now for a comprehensive aluminum profile packaging solution—a complete solution and one-stop service!
For more details, kindly visit Protective Film for Aluminum.
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