In today's printed peritoneal technology, part of the color packaging film method is to use biaxially oriented polypropylene film, and the product after the film will appear dull or blistered. There are usually four situations that lead to these two phenomena in laminating products. First, the most important issue is temperature: inappropriate temperature control; followed by insufficient pressure, the amount of glue out of the peritoneum, and the cleanliness of the roller. Great help. The manufacturer of Tongjia laminating machine conducts in-depth scientific analysis and finds a solution to the phenomenon that the laminating product is not bright and blistering. The following is a detailed introduction to you:
        1. Temperature control is not suitable
        When the small laminating machine coats different substrates, the temperature of the electrically heated steel drum must be adjusted according to the coated product. If the coated substrate is gold cardboard, the temperature of the laminated steel cylinder should be controlled at 70-80 ° C; if it is coated with 250g / m2 or 300g / m2 gray whiteboard paper, the temperature should be adjusted to 80-90 ° C. During the placement of whiteboard paper, the moisture it absorbs far exceeds that of gold cardboard. Especially in rainy days and winter, if the temperature is not adjusted properly, the film-covered product will not shine.
        When laminating, sometimes there are obvious water droplets or steam on the silicone roller, which is caused by the paper absorbing a lot of moisture. The film laminating temperature of such products must be raised a little bit more. For general products, the temperature of the drying tunnel can be controlled at 50 ～ 60 ℃, and the glued film can be stuck on the exit of the drying tunnel with fingers without obvious traces, and it can be a little sticky. If the film temperature is adjusted too high, it will foam. Therefore, the temperature of the heating steel drum must be controlled according to the characteristics of the product when laminating.
        Second, the amount of glue
        When using stretched polypropylene film to cover the film, glue must be applied to the film. The amount of glue is applied to a moving film by a transmission steel roller installed in a rubber box through a rotating belt. The amount of glue is controlled by a steel blade that falls on the steel roller. The amount of pressure light glue is large; the amount of pressure heavy glue is small. The amount of glue should be mastered, so that it can be covered evenly, and no crystal points can be produced. If the amount of glue is too large, the covered product will be dull.
        Special attention should be paid to the process of gluing, it is necessary to prevent the tiny particles and foreign objects after the gel solidifies from remaining in the rubber tray. If it is left, it will be picked up by the rubber roller during rotation and stuck on the rubber blade, and there will be a rubber-free white mark here. Therefore, after a long shutdown of the laminating machine, before the laminating machine is started, the laminating pump and the hopper box should be cleaned with laminating water or high boiling point kerosene to ensure that the glue of the upper roller is normally coated on the film without being produced Trace.
        3. Insufficient pressure

        According to the needs of customers, the thickness of the substrate material of the small laminating machine is mostly inconsistent. When laminating, the pressure between the silicone roller and the steel roller should be adjusted according to the thickness of the substrate paper. If the pressure is too low, the film of the film-coated product is not strong, bright, and easy to produce wrinkles; too much pressure will cause film wrinkles and paper deformation.