Problems that should be paid attention to in digital printing laminating, binding and cutting（2）

Digital printing is a completely digital production system. The digital process runs through the entire production process, from information input to printing, and even binding output. Digital printing integrates pre-press, printing and post-press. From the perspective of system control, it is a seamless all-digital system.

However, in order for digital printing to truly demonstrate its superiority, in addition to pre-press and printing processes, it also requires better matching of post-press processing. Therefore, attention should be paid to the coordination of post-press processing of digital printing. Now let's talk about the issues that should be paid attention to, such as laminating, binding, and cutting, which are closely related to digital printing.

1. Laminating problem

Laminating is a commonly used post-press finishing method for printed materials such as books and magazines. It has a wide range of applications and is also suitable for digitally printed products. Laminating the surface of digital prints, especially after printing a large area of land, will help to protect the prints during post-press processing, especially when cutting or packaging, and can make printing The product is more beautiful and durable. However, it is not necessarily advantageous to apply a single-sided film to a double-sided printed matter, because the uncoated side may easily peel off the printed color due to friction during subsequent processing. Many printed products are covered with various gloss films, matt films, and matting films to pursue unique effects. However, it is more suitable for digital printed products to adopt thermal laminating film, which is convenient to use and low in price. The main films used for thermal lamination are polyester film and polypropylene film. Generally, polypropylene film is required for thinner films, and thicker polyester film can be used for printed products that require additional protection. 

The price of polyester film is more expensive than polypropylene film, but it has high strength and can provide better protection for printed products. If both sides of the printed product need to be coated, polyester film is best. In the lamination of digital printing products, it is mainly necessary to avoid problems such as curling of the printed product after lamination. Therefore, if conditions permit, cover both sides of the printing material as much as possible; if only one side of the paper is coated without the other side, curling is very easy to occur. But be aware that only one-sided lamination can be applied to the cover of the perfect binding book. Do not cover the second and third back cover, otherwise the book block and the cover cannot be firmly bonded. 

In addition, when choosing a laminating machine, you can also choose a rod to prevent the laminated printed product from curling, so that the laminated product can be smooth and not curled. Avoiding product blistering after film coating is also an issue that should be paid attention to in film coating. When thermally laminating a printed product, first of all ensure that the surface of the printed product to be coated is clean and dust-free, and secondly, the temperature must be appropriate. Too high temperature will easily melt the toner and cause the film to bubble. 

In addition, OPP film can be used in order to prevent wrinkles on the product after the film is folded. Regarding the selection of laminating materials, because laminating may affect the color reproduction of digital printed products, this is mainly because the films used in laminating are not necessarily 100% transparent films, which will affect the color balance. Therefore, to be on the safe side, you can first try to cover a few samples to the customer to see if the color of the printed product after the film meets the customer's requirements, and then formally process the film.