According to the different raw materials and equipment, the coating process can be divided into two kinds of coating process and pre-coating process. That is to say, the film used in the coating process is now coated, and the adhesive used is generally solvent-based and emulsion type, prepared according to need. However, the film used in the pre-coating process is pre-coated, and the adhesive used is generally hot melt and solvent volatile. According to the film process of paper printed matter, the film process can be divided into three categories: dry film process. Wet laminating and precoating pressing. Dry laminating method is the most commonly used laminating method in China, which is to coat a layer of adhesive on the plastic film, and then evaporate and dry the solvent in the adhesive through the drying tunnel of the laminating machine, and then bond with the paper printed matter to form a laminating product under hot pressing. Wet film is coated on the surface of the plastic film with a layer of adhesive, in the case of the adhesive is not dry, through the press roller adhesive and paper printed matter bonding, forming a film product. Since the emergence of water-based laminating machine, the process of water-based laminating machine has been popularized and applied, which is closely related to the characteristics of the wet laminating machine, such as simple operation, less adhesive amount, no organic solvent damage to the environment, high strength, high grade and easy recovery. At present, the coating process is more and more favored by domestic packaging manufacturers, and has been widely used in gift boxes, handbags and other packaging. Coating glue manufacturers said that the pre-coating coating method is the coating film manufacturers directly purchase the plastic film coated in advance, and when the film needs to be coated, the film and paper prints are hot pressed on the coating equipment to complete the coating process. The pre-coating process began in the 1990s. The pre-coated film is obtained by applying hot melt adhesive or low temperature resin to the film substrate quantitatively and uniformly with special equipment according to design. According to the coating adhesive manufacturer, the pre-coating coating method eliminates the need for adhesives, preparation, coating and drying, and the entire coating process can be completed in just a few seconds, without polluting the environment, no fire hazards, and no need to clean the coating equipment. At present, the technology has been applied to the field of medicine and food packaging. Sinograce company produces water-based laminating adhesive, excellent quality, cost-effective, technical support, welcome to contact.

There are many factors affecting the quality of the film, in addition to paper, ink layer, film, adhesive and so on In addition to the objective factors, it is also affected by subjective factors such as temperature, pressure, speed, and glue amount. If these factors are not handled well, various laminating quality problems will occur. There are snowflakes on the product 1.The amount of glue is too small: the amount of glue is too small, and snow spots will appear on the entire surface of the print. The amount of glue can be appropriately increased. 2.Inappropriate pressure: too much pressure on the pressure wheel will squeeze out the adhesive on the edge of the print, resulting in snowflake spots on the edge of the print; Snowflake spots can also appear if it is not compacted. The pressure can be adjusted appropriately. 3.Print powder spraying too much: print powder spraying too much, the compound appears loose pine flower white fog, encounter this situation, should be appropriate to increase the amount of glue, or in the coating before sweeping the print powder. The product has bubbles. 1.The printing ink layer is not dry: first hot press again and then glue, you can also postpone the coating date, so that it is dry. 2.The printing ink layer is too thick: the amount of adhesive coating can be appropriately increased, and the pressure and composite temperature can be increased 3.Film drying temperature is too high: the drying temperature is too high, will cause the adhesive surface crust and foaming failure, which should be appropriate to reduce the drying temperature. 4.Pressure wheel pressure is too small: there are bubbles on the surface of the entire printing product because the pressure of the pressure wheel is too small, and the pressure of the pressure wheel can be appropriately increased. The coated product has wrinkles The main reasons for the wrinkling of the coated product are the imbalance of the film transmission spoke, the inconsistency of the tightness at both ends of the film or the wavy edge, the thickness of the rubber layer, or the uneven electric wheel and the rubber spoke at both ends, the pressure is inconsistent, and the linear speed is different. Measures can be taken to adjust the transfer wheel to the equilibrium state, increase the film, adjust the amount of glue and increase the temperature of the drying channel, adjust the position and process parameters of the electric heating wheel and rubber wheel, etc.

In daily life, we will use glue in many places, and we often see the figure of water-based glue. If you say you can't remember where you used glue, look at street posters, advertisements, and alley shoe repairmen.We usually use glue in class or work to stick some paper, bills and so on. It can be said that water-based glue has always been around us. In addition, water-based adhesives have also been widely used in some enterprises. Maybe everyone has used water-based glue, but they do not know what water-based glue is. Water-based glue is actually a kind of glue made by emulsifying polyurethane resin or acrylic acid through a certain process using water as a solvent. Water-based adhesive has been widely used in many industries. Water-based adhesive can be so popular is also related to its own advantages. Its own adhesive property is relatively good, and the object can be adhered to well. The price of water-based adhesive is relatively low, compared with other types of products, the price of water-based adhesive is lower, and this point, whether it is for individuals or manufacturers, is very beneficial.

Composite film manufacturer there are bubbles and spots in the composite film, what is the cause? There are many factors in this kind of situation, and the actual situation needs to be analyzed in detail. The basic elements commonly used to produce bubbles and spots are: 1, environmental factors such as dust and suspended matter interference, which requires a good environmental health area environment); If there is a suspended substance in other adhesives, it is necessary to identify whether it is carried by the adhesive itself or with a plastic bucket; 2.The equipped adhesive is doped with water, which is not dried at the ambient temperature of 60 ~ 90 degrees in the drying channel, and reacts with the curing agent to produce CO2 bubble and white crystal point after chemical crosslinking, and there are two kinds of gas bubble and water vapor bubble in the composite film; 3.the ambient humidity in the working area environment is too large, the water in the air adheres to the plastic surface, especially the plastic surface with large hygroscopicity, such as nylon, cellophane and other easy crystal points; 4.When the adhesive is equipped, the concentration is too thin, the amount of glue is short, the amount of glue is short, the mesh roll is blocked, and other factors are composed of regular spots or bubbles. 5.the film quality is poor, that is, the surface tension of the base film is too poor, the composition of the adhesive is poor, and there is no glue where the bubble is generated; 6.During the coating, the Angle of the scraper and the fluctuation of the adhesive are relatively large, and the impact of the bubble is generated. When the composite machine is working quickly, the bubble can not be immediately subsided, resulting in a lot of bubbles in the rubber tray, which are then engrafted and transferred to the film (the viscosity of the adhesive is too high, and the bubble will be generated); 7.The coating pressure is short, the outer temperature of the coating roller is too low, the adhesive activation is short, and the circulation is small, so that the open space between the adhesive dot and the dot can not be filled, and there is a thin open space to form a bubble; 8.Adhesive product quality problem 9.The interference of water and alcohol in the coating glue manufacturer,should be avoided as much as possible during coating Sinograce Chemical produces all kinds of paper film composite glue, dry composite glue, welcome customers to buy