In silicone mold heat transfer, matte hot melt adhesive film is usually more suitable. Its advantages are reflected in demolding efficiency, surface effect adaptability and process stability. However, glossy film still has application value in specific scenarios. The following is a specific analysis:
1. The core advantages of matte hot melt adhesive film
Higher demolding efficiency
The surface of matte film is slightly rough or matte, and the contact area with the mold is small. The roughness can form a tiny air layer, reducing the vacuum adsorption effect, thereby reducing demolding resistance. In contrast, the surface of glossy film is as smooth as a mirror, which is easy to form a tight fit with the mold. It needs to overcome greater adhesion during demolding, especially when there are fine textures on the mold surface, which may increase the difficulty of demolding due to the "mirror adsorption" effect.
More adaptable surface effect
Anti-reflective and dirt-resistant: Matte film is non-reflective, suitable for light-colored products or products that require a low-key texture, and its dirt resistance is better than that of glossy film (the latter is easy to show stains under light colors).
Visual softness: The misty texture of matte film can avoid light interference, improve reading comfort (such as book covers, magazine pages), or create a high-end and stable visual effect (such as hardcover books, anti-counterfeiting labels).
Better process stability
Temperature tolerance: Matte film has a wide melting point range and a higher tolerance to temperature fluctuations. It can maintain good fluidity even at slightly lower temperatures, reducing film carbonization or mold adhesion caused by excessive temperature.
Pressure uniformity: Matte film is less sensitive to pressure. Even if the local pressure is uneven, it can be buffered by surface roughness to reduce uneven force during demolding.
2. Applicable scenarios of glossy hot melt adhesive film
Although matte film is better in demolding and adaptability, glossy film still has application value in the following scenarios:
High gloss demand:
For example, cosmetic packaging, high-end gift boxes, etc., glossy film is needed to improve the product texture. At this time, the difficulty of demolding can be alleviated by optimizing the process (such as using a release agent and adjusting the cooling speed).
Simple mold or flat transfer:
When the mold surface is flat and textureless, the demoulding resistance of the glossy film is small, and the color saturation of the pattern can be better presented.
3. The influence of the process characteristics of silicone thermal transfer on the selection of film
Silicone thermal transfer itself has the following advantages, which need to be selected in combination with the characteristics of the film:
Durability and flexibility:
Silicone is wear-resistant and stretch-resistant, and the pattern is clear for a long time after transfer, but the flexibility of the film needs to match to avoid demoulding fracture. Matte film is usually more flexible than glossy film after curing due to the addition of matting agent, and is more suitable for the elastic properties of silicone.
Environmental protection and safety:
Silicone heat transfer materials meet environmental protection standards. Both matte film and glossy film must be non-toxic and odorless, and have passed safety certification to ensure safety when contacting skin or food.
Three-dimensional sense and layering:
Silicone heat transfer can create three-dimensional patterns. The matte texture of matte film can enhance the layering, while glossy film highlights the contrast between highlights and shadows. It needs to be selected according to design requirements.