The film used for the hot film is mainly composed of polyester film and polypropylene film. In general, polypropylene film is required when covering a thin film, and a thicker polyester film may be used for an extra protection. Polyester film is more expensive than polypropylene film, but it has higher strength and can provide better protection for printed products. If the two sides of the printed product need to be coated, the polyester film is preferred.
In the lamination of digital printing products, it is mainly necessary to avoid problems such as curling of the printed product after lamination. Therefore, as far as conditions permit, both sides of the substrate should be covered 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 for the binding books of wireless binding books can only be coated on one side, do not cover both the seal 2 and the seal 3, otherwise the book block and the cover cannot be firmly bonded.
In addition, when the laminator is selected, it is also possible to select a rod that prevents the film from being curled, so that the product after the lamination can be flattened without curling. Avoiding lamination after laminating is also a problem that should be paid attention to in lamination. When the film is hot-laminated on the printed product, the surface of the printed product to be covered with the film must be clean and dust-free. Secondly, it must be noted that the temperature must be appropriate. Too high a temperature may cause the toner to melt, resulting in blistering of the film.
In addition, OPP film can be used to ensure that the folded product does not wrinkle after folding. For the selection of coating materials, because the coating may affect the color reproduction of digital printing products, this is mainly because the film used when coating film is not necessarily 100% of the packaging machine 'target = _blank> transparent film, so It will affect the color balance. Therefore, for the sake of safety, you can try to cover a few samples to the customer first to see if the color of the printed product after the lamination meets the requirements of the customer, and then form the laminating process.
Laminating the surface of digital prints, especially after printing a large area on the ground, will help the protection of printed materials in post-press processing, especially cutting or packaging, and enable printing. The product is more beautiful and durable. However, the single-sided lamination of double-sided prints may not be advantageous because the uncoated side may be susceptible to peeling of the print color due to friction during subsequent processing. Many prints are covered with various bright films, matt films, and matt films to achieve distinctive effects. However, digital printing is more suitable for hot printed films. This method is convenient and inexpensive.
Crystal Nail File,Crystal Glass Nail File,Crystal Clear Glass Nail File,Crystal Nano Nail File
Bonet Houseware Co., Ltd. , https://www.bonetbt.com