Digital printing products post-printing process notes
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Laminating is a commonly used post-press finishing method for printed materials such as books and magazines. It has a wide range of adaptations and is suitable for digital printing products.
Laminating the surface of digital prints, especially after printing large areas and then laminating, will help protect the printed matter during post-press processing, especially during cutting or packaging. The product is more beautiful and durable. However, it is not necessarily advantageous to carry out the single-sided coating on the double-sided printed matter, because the uncoated side may be prone to peeling off of the printing color due to the frictional force in the subsequent processing. Many printed products are covered with various bright films, matt films and matting films to achieve distinctive effects. However, digital printing is more suitable for hot film coating. This method is convenient to use and low in price.
The film used for the thermal coating mainly includes a polyester film and a polypropylene film. Generally, a polypropylene film is required for coating a thin film, and a thick polyester film may be used for a printing product requiring additional protection. The price of the polyester film is higher than that of the polypropylene film, but the strength is high, and the printing product can be better protected. If the two sides of the print need to be coated, it is best to use a polyester film. In the film coating of digital printing products, it is mainly necessary to avoid failures such as curling of the printed product after lamination. Therefore, when conditions permit, the film is coated on both sides of the substrate as much as possible; if only one side of the paper is coated and the other side is not covered, curling is very likely to occur. However, it should be noted that the cover of the wireless binding book can only be coated on one side. Do not cover the cover and seal three, otherwise the book block and the cover cannot be firmly bonded.
In addition, when the laminating machine is selected, it is also possible to select a rod for preventing the curling of the coated printing product, so as to ensure that the product after lamination is flat and not curled. Avoiding foaming of the product after lamination is also a problem that should be paid attention to in the film. When hot stamping the printed product, first ensure that the surface of the printed product to be coated is clean and dust-free. Secondly, the temperature must be suitable. If the temperature is too high, the toner will melt and cause foaming of the film. In addition, in order to prevent the wrinkles after the film is folded, the OPP film can be used. For the selection of the coating material, the film may affect the color reproduction of the digital printing, mainly because the film used in the film is not necessarily 100% transparent film, so it will affect the color balance. Therefore, for the sake of insurance, you can try to cover a few samples to the customer to see if the color of the printed product after the film meets the requirements of the customer, and then formally process the film.