Construction defect repair technology for automotive color changing film: from bubble treatment to film surface refurbishment

Construction defects are a common problem in the application of color changing films and require repair through professional tools and techniques. This article will classify and analyze the repair methods for defects such as bubbles, scratches, and curled edges.

1. Bubble defect repair

The causes of bubble formation include incomplete exhaust, adhesive failure, or high environmental humidity. Repair techniques include:

Needle puncture exhaust method: Use a 0.5mm diameter puncture needle to puncture the center of the bubble, and use a rubber scraper to squeeze and exhaust from the edge towards the center. In a certain case, bubbles with a diameter of 5mm can be completely eliminated within 2 minutes.

Local heating method: Heat the stubborn bubble area with a hot air gun to 60-80 ℃ to restore the fluidity of the glue and then re compact it. A certain experiment shows that the peel strength of the adhesive can be restored to 85% of its initial value after heating.

Glue replenishment method: For large areas of delamination, inject a small amount of acrylic glue with a syringe and press it together. In a certain brand's repair kit, the glue curing time is only 10 minutes.

2. Scratch defect repair

The depth and length of scratches determine the repair plan:

Shallow scratches (depth<10 μ m): After lightly grinding with 2000 grit sandpaper, apply a polishing paste containing silicone oil. In a certain case, the repaired scratch is not visible under strong light.

Deep scratches (depth 10-50 μ m): Using the "filling+grinding" process, first fill the scratches with UV cured resin, and then polish them with 1500 grit sandpaper. The curing time of a certain brand's repair resin is only 30 seconds.

Penetrating scratches: Local replacement of the film material is required. Use a utility knife to cut along the seam and replace the new film. A certain technical specification requires that the joint width should not exceed 0.5mm.

3. Repair of curled edge defects

Bent edges are mainly caused by glue failure or uneven stress on the edges. Repair methods include:

Thermal activation method: Heat the curled edge area with a hot air gun to the softening temperature of the adhesive (usually 80-100 ℃), and re press it with a scraper. In a certain case, the height of the raised edge was reduced from 2mm to 0.3mm.

Tape reinforcement method: Stick 3M VHB double-sided tape on the inside of the raised edge, with a width not exceeding 5mm. A test shows that the edge peel strength is increased to 15N/25mm after reinforcement.

Edge wrapping method: For severely curled edge areas, remove the original film and re wrap the rubber sealing strip. A certain construction standard requires a coating depth of ≥ 3mm.

4. Membrane surface renovation technology

For color changing films with severe aging, refurbishment technology can be used to extend their service life:

Chemical cleaning method: Use specialized cleaning agents (pH 7-8) to remove membrane surface pollutants and avoid damaging the coating. In a certain case, the glossiness of the film surface was restored to 90GU after cleaning.

Coating regeneration method: spraying fluorine-containing polymer regenerant to repair hydrophobicity and stain resistance. A certain brand of rejuvenator can increase the contact angle from 110 ° to 135 °.

Partial replacement method: For membrane surfaces with a damaged area exceeding 30%, cut them in sections and replace them with new membranes. A certain technical requirement requires a 5mm overlap at the joint between the new and old membranes.