Appearance

• Pattern Clarity: The patterns of high-quality water transfer printing films are clear and delicate, with bright and uniform colors, and no defects such as blurring, ghosting, or color spots. For example, in wood grain water transfer printing films, the wood texture should be natural and smooth, just like real wood.
• Film Surface Flatness: The surface of a good-quality water transfer printing film is flat and smooth, without bubbles, wrinkles, scratches, or impurities. You can place the film on a flat surface and observe the film surface from different angles to check for unevenness.
• Edge Neatness: The edges of the water transfer printing film should be neatly cut, without burrs, notches, or curling. Neat edges facilitate construction operations and ensure the effect after transfer printing.

Material Properties

• Flexibility: Gently bend or stretch the water transfer printing film. High-quality films have good flexibility, are not easy to break or crack, and can adapt to the surfaces of transferred objects with different shapes and curvatures.
• Transparency: For water transfer printing films that need to show the color or texture of the underlying layer, such as transparent wood grain films, high transparency is crucial. Good films can clearly display the color and texture of the underlying layer, and there is no obvious turbidity or yellowing.
• Thickness Uniformity: Use tools such as a micrometer to measure the thickness of the water transfer printing film. High-quality films have a uniform thickness. Uniform thickness helps to ensure the stable performance of the film during the transfer printing process and the uniformity of the pattern.

Performance

• Adhesion: Transfer the water transfer printing film onto a test sample. According to standard test methods, such as the cross-cut test, stick adhesive tape to the surface of the transferred film and quickly peel it off, then observe the film’s peeling situation. High-quality water transfer printing films have good adhesion to the surface of the transferred object and are not easy to peel off.
• Water Resistance: Soak the water transfer printing film in water for a period of time and observe the changes of the film. After soaking, the patterns of high-quality films will not fade or blur, and the film body will not deform, dissolve, or delaminate.
• Weather Resistance: Conduct aging tests on the water transfer printing film by simulating the light, temperature, humidity, and other conditions of the actual use environment. After aging tests, high-quality films can still maintain a good appearance and performance, such as minimal color change, no obvious cracking, or powdering.
• Printing Precision: If there are fine patterns or texts on the water transfer printing film, check its printing precision. High-quality films can accurately reproduce the designed patterns, with clear lines, complete details, and accurate color registration.