Postpress hot topics

The choice of coating and mounting between cold and heat treatment is the final processing of the printed matter, and it is generally hot and cold. The choice of heat treatment or cold treatment cannot be based on personal preferences, just like someone who likes to eat chicken and someone who likes to eat steak. It is a question that must be considered with many technical factors plus some intuition. It is a bit like the tactics of a football coach choosing a game: whether it is a short pass, a long pass, or both. And some of the methods are more effective. For most large-scale commercial color printing companies, both hot and cold laminating and mounting systems must be installed. They will never limit their ability to heat or cold only. The following lists the basic principles for choosing a post-printing system for the post-processing of printed products: * For paper-based prints, first consider the use of thermal laminating or mounting techniques, especially when wrapping is required. * For those prints printed by ink-jet printers, the cold treatment method must be selected; besides, when the print materials used are substrates that have never been subjected to heat treatment other than paper, if they are not tested for time, they must be used. Cold film. * The heat-sensitive material should be cold-processed. * For those materials that need to maintain good flexibility after processing, vinyl or other cold laminating techniques should be used. * If the volume of processed prints is small and the value is high, it is better to use cold treatment technology, so as to ensure that the volume of the processed product will not swell afterwards. * If the printed matter can be heat-treated and the result is good after the treatment, it is better to use heat. Because heat treatment is relatively low cost. Advantages and disadvantages comparison and benefit trade-off: The use of thermal film or cold type (using pressure sensitive adhesive or PSA) film treatment has its own advantages and disadvantages. The cost of thermal film is usually only three to one-quarter of the thickness of the cold film of the same thickness, and it is coated on the attachable material. The combination of the two is relatively durable and strong. The thermal film provides a true envelope, but the cold film does not provide it. The PSA film used in the cold process has a wider range of adhesion and can be adhered to a variety of materials, and the formulations are also different and are applicable to a wider range of applications. Hot-film can be used for almost all plain and other forms of prints, but to a certain degree, it cannot adhere to more than half of inkjet-printed prints. The cost of cold film is relatively high, and it is more prone to foaming or silvering, which is a threat to the lamination process. In addition, if the surface of the treated product is a little dusty, the cold treatment will show it unambiguously, and it will not hide as much as the heat treatment. Therefore, the requirements for the cleanliness of the machine itself, the printed products and the operating environment are relatively high. Normally, the cold laminating method can only be performed on one side, so the operator must be particularly careful and take some protective measures to prevent the adhesive glue from flowing into the roller. In the printing industry, there is an old rule for all machines that do single-sided processing: Never allow glue to enter the rollers! If measured from the perspective of cost, a basic principle of compliance is: When considering which method to use for coating, if heat treatment technology can achieve the desired effect, heat treatment methods should be selected as much as possible. Based on this, consider what kind of printing materials to use to match it. Cold film is suitable for those materials that are sensitive to heat, suitable for ink-jet printing inks and papers, because hot-melt adhesives usually can not bond them well. Hot films tend to be based on polyester polymers, and these organic polymers harden after curing. Therefore, for those prints that are still soft after processing, the heat method is not applicable. Vinyl-based films are soft and often used for cold treatment. Due to its better softness, vinyl film products are also often used in automobiles. Because the printed product with its cover can cover the rivets and ridge strips without causing buckling deformation of the image. Although the heat treatment method can also be used to treat vinyl films, it can cause deformation of the vinyl film, and the degree of adhesion after the treatment is also not good. Sometimes, even if the vinyl film is barely adhered by a heat treatment method, it hardens and loses its greatest advantage of flexibility. Applications that typically use heat-treated coatings include: * Plain or other differently printed paper prints * Ink-jet prints, uncoated paper * Ink-jet prints, paper coated (but The adhesiveness of paper and glue must be verified by practice.) * Things that need to be enveloped * Electrostatically printed images * Paper works copied by color copiers. (Adhesion of paper and glue must be verified by practice.) * Photographs (must be tested for adhesiveness of paper and adhesives) Applications that typically use cold film include: * In vinyl, polyester, or other plastics. On-printed prints* Heat-sensitive materials (such as prints with wax-containing inks) * Prints printed on vinyl or other similar soft materials require a vinyl film to maintain flexibility Sex. * Artwork or showpieces that require special treatment * Inkjet printed works * Photos Obviously, both methods can handle some of the same items. This is like an operator. Some people can always find ways to use thermal film to process ink-jet prints; while others have never succeeded, they chose to deal with ink-jet prints with cold treatment. This difference is caused by different operators' own experience. The hot film coating process has a very significant advantage: it can be double coated. Few cold-treatment laminators can perform double-sided processing at one time. A cold laminating machine generally has only one working route and can only handle one side at a time. Large-format heat-treatment laminators can only handle one surface at a time, but there are not many in the market, and most thermal laminators deal with both surfaces at one time. These laminators can also enclose the prints, leaving a clean, sealed area around the coated print. Compared with the adhesive force between the PSA film and the film, the adhesive force between the hot films is more tight, waterproof, and more durable. Adhesives Now we look at both hot and cold mounting adhesives in terms of pros and cons. As with the film, the cost of the thermal adhesive is usually only a fraction of the cost of the pressure sensitive adhesive. If used for mounting, the cost difference of this adhesive is even greater. Applying a 3/16-inch foam board with PS (pressure-sensitive adhesive) costs more than twice the cost of the board. The use of active thermal film adhesives is only 20% of the board price. Similarly, the price per square foot of a dry tissue paper (a sheet of paper at room temperature that becomes transparent after heating is active) is only a fraction of the cold-treated adhesive. Although cognac tissue paper is not suitable for most ink-jet printed products, there are ways to deal with this problem. For example, a method of directly applying a binder to a foam board in advance is used. Some heat-activated cement (HAM) coatings exhibit some stickiness at room temperature. If you press it with your finger, it will leave a mark on the pre-painted plate. Coarse tissue paper and pre-coating are easy to combine, can play a very good protective effect on printed products, and effectively prevent the intrusion of dust. Similar to heat-treated films, hot-adhesives have a major disadvantage: they do not stick to most plastics or coated paper. For PSA, solving such problems is a piece of cake. It bonds well with many materials unless the material is made of wax, silicon or other volatile materials. Another feature of hot adhesives is simple operation. This advantage can be demonstrated when dealing with large-scale installations. By pre-coating the surface, a pattern is printed on the pre-coating, and the temperature is lowered and the speed is reduced. The heat treatment can also handle the prints that cannot be processed normally. However, unless the performance of the adhesive is improved, the use of this heat treatment is still rare. PSA pressure film, hand-eye fit better, and the operation must be very careful. First of all, you must pull out a piece of discharge liner, position the print, and then start laminating. In the laminating process, it is necessary to carefully hold the printed product and hold the discharge liner in one hand to prevent the front side of the print from sticking to the adhesive and prevent the back side of the print from being rolled back. The transparency of the PSA adhesive is good, and it is often used when the cover is mounted. (When used for high transparent acrylic patches or glass sheets on sticky and printed products) On the hot and cold films of the UV film, an ultraviolet protection agent can be added to become an ultraviolet film. The protective agent is generally sandwiched in the adhesive layer. This anti-ultraviolet measure can keep images longer. But sometimes this function is exaggerated too much. Be aware that visible light, in addition to ultraviolet light, can still cause image degradation, although this degradation is slower than ultraviolet light. The transparent film cannot block visible light. To really extend the time, you should work on ink, color, and dyeing. If their resistance to degradation is strong, they can be stored for a long time even if they use a normal membrane. However, if they are easily degraded, no kind of film can stop the degradation of the print image. Another interesting fact is that the general hot and cold film without UV protection can block most of the UV rays. Therefore, choosing a good anti-degradation printing medium is the key to solving the problem, and film-enhancing technology is just a means of strengthening, not a panacea to prevent degradation.

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