The laminating process adopted by the automatic laminating machine refers to the whole process of laminating pictures and photos, including film selection, laminating making, and cutting.
1. Cover the picture with a protective film to improve the strength of the picture and the wear resistance of the surface.
2. Isolate the picture from the outside air to prevent deformation and cracking caused by corrosive gases in the atmosphere, moisture, dryness, fading and discoloration caused by rain washing and ultraviolet radiation, and to maintain the bright color of the picture for a long time. Extend the life of picture display.
3. Paste the picture on the display board or cloth surface to make a hanging advertising screen.
4. Press a special mask or sheet on the picture to form a picture with special artistic effects such as bright, matt, oil painting, virtual, and three-dimensional.
The main problems common to automatic laminating machines are:
Surface blistering, wrinkles, uneven bending, shedding and separation, difficult storage, etc., these quality problems have not been solved for many years, and the reasons for analysis are also various, such as:
1. The influence of different types of paper.
2. The influence of different ink colors.
3. Different effects of climate.
4. The influence of environment and conditions.
5. The enterprise lacks the influence of scientific management.
6. The influence of the quality of the operator of the automatic laminating machine.

Although the overall performance of the pre-coating film coating method is better than that of the instant coating film coating method, in view of the current status of the domestic automatic laminating machine, the vast majority of domestic enterprises are still generally using the instant coating film coating process. The water content changes with the relative humidity of the air. Prints that are sensitive to humidity will generate internal stress due to dimensional changes. For example, the longitudinal expansion and contraction rate of printed matter is 0.5%, and the longitudinal thermal shrinkage of BOPP film is 4%. If the printed matter absorbs too much water and stretches, internal stress will be caused between the heating and shrinkage of the film, which will cause the laminated product to curl, wrinkle, and stick. The main reasons for insecurity can be summarized as follows.
First, the pre-coating film coating technology started relatively late in China.
Second, the production of pre-coating film has high technical content, complicated process, and large equipment investment. General enterprises cannot afford to invest in pre-coating film production lines.
Third, due to the surplus of labor resources and low labor costs in my country, material costs account for a large proportion of the overall cost of the film coating process. The cost of pre-coating film is higher than that of coating film, which will inevitably affect its application.
On the one hand, in terms of strength, the UV coating process has little contribution to enhancing the strength of the printed matter, while the laminating process can increase the strength of the printed matter several times. On the other hand, with the advancement of technology, further processing such as hot stamping and frosting after coating will make the post-processing process of printed matter more complicated. In today’s era when intellectual property protection is emphasized and businesses emphasize product anti-counterfeiting. Coating has more advantages than UV coating.
The laminating speed of the automatic laminating machine determines the melting time of the adhesive on the pre-coated film on the heating roller and the contact time between the film and the paper. The laminating speed is slow, the heating time of the adhesive on the BOPP film is relatively long, the pressing time of the film and paper is long, the bonding effect is good, but the production efficiency is low. The laminating speed is fast, the heating time of the adhesive on the BOPP film on the heating roller is short, the contact time between the film and the paper is short, and the bonding effect is poor. The production speed of domestic pre-coating film laminating equipment is generally controlled between 5 and 30m/min.

With various materials, the laminating process completed by the small laminating machine is divided into several categories according to the temperature and use of the raw materials (consumables) used, and the following categories are introduced.
Cold laminating: The method of laminating the protective film on the surface of the picture by cold pressing at room temperature is called cold laminating. Among them are single-sided mounting and double-sided mounting. In the operation method, there are also manual peeling and self-removing film mounting. The cold lamination process has the characteristics of simple operation, good effect and low cost. At present, it is widely used in the post-production of advertising light boxes, engineering drawings and wedding photography.
Principle of use of small laminating machine:
(1) Use instant coating film as cover to protect paper. After laminating, the service life of the cover (or the surface of the printed product) can be prolonged, especially for students' textbooks, so the amount is increasing.
(2) The impression is not easy to be destroyed. After being coated with a coating film, it can increase the color effect and protect the color printing graphics and texts without causing them to be worn. This is conducive to publishing houses' art editors to make various art designs on the surface of the cover or printed matter according to their needs, which also promotes the increase in usage.
(3) The production of coating film is profitable. In the coating process, the production cost of the coating film is low, easy to use, and profitable, and the enterprise can profit.

The current cold laminator and hot laminator on the market are prone to warping for thin paper laminating (unless a professional high-cost anti-roll single-sided hot film is used). If the paper is After curling and unfolding, bubbles and wrinkles may appear. Single-sided cold lamination will also cause paper curl, especially paper under 100g is prone to curling. The following will tell you the causes and solutions for the wrinkles of the cold laminating film.
For small and medium-sized graphic fast printing and units, the thermal laminating machine is more popular. The overall effect is still good, but if you use too thin paper, such as 100g or less, it will curl. This also requires technical guidance. The operation will be slightly slower. , But no roll at all, the effect of choosing a fully automatic laminating machine is different. Most customers can understand this, but if paper wrinkles occur, the general maintenance solutions are as follows:
1. The roller pressure is uneven, which causes the paper to wrinkle during the laminating process. In this case, the roller pressure should be corrected first, and then start the operation.
2. There is dirt on the rubber roller, which causes the paper to wrinkle when laminating. The rubber roller should be cleaned in time, and the rubber roller must be kept clean frequently.

Small laminating machines can be divided into two categories: instant-coating laminating machines and pre-coating laminating machines. The pre-coating type heat laminator is also called the heat laminator. The laminator is small in size, low in cost, and flexible and convenient to operate. It is not only suitable for the laminating processing of large quantities of printed materials, but also suitable for small batch and scattered printed materials such as automated desktop office systems. Film processing has a promising future. Widely used in all kinds of modern wedding dresses, art photography, computer inkjet, calligraphy and painting, posters, advertising pictures, renderings, documents, etc., suitable for photo agencies, printing plants, advertising, design and stickers and other fields , The investment is small, the effect is obvious, the consumables used are pollution-free, it is a green environmental protection product, and the market potential is great.
Laminating the surface of digital printed matter, especially after printing a large area of ​​land, will help to protect the printed matter in 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 coating 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 to use thermal laminating film for digital printing, which is convenient to use and low in price.