First, the concept and significance of film
Film coating, that is, film, is the plastic film coated with adhesive, and paper prints after heating, pressure, and then bonded together to form a paper-plastic products a processing technology. The laminated film prints have a thin and transparent plastic film on the surface. The surface of the film is more smooth and bright, which improves the glossiness and fastness of printed materials. The graphic and text colors are more vivid and full of three-dimensional feeling. , anti-fouling, wear-resistant, folding, chemical corrosion and other effects. 
The most undeniable fact at present is the protective effect of the film. Whether it is wear-proof, waterproof or UV-resistant film, their functions are unmatched by ink and paper. Especially for those works that need to be displayed, I do not know how many times they must be handled, handled, moved or moved. Only the film can effectively prevent scratches, scratches and other mechanical damage. For matte works such as matte, the adhesive in the film can penetrate into the gap of the toner, which can reflect the most subtle colors and improve the color depth of the image. For bright works, it can also reduce the degree of surface reflection of the printed products, and protect the human eye under the premise of obtaining the maximum color depth. Moreover, the film can improve the appearance of the product and stimulate the consumer's desire to purchase. Despite the appearance of waterproof paper and waterproof ink, their price is double that of the film. And the effect is not as laminating. 
Second, the classification of laminated film
According to the coating process is divided into three types: dry coating, wet coating, oil coating. According to the nature of the plastic film is divided into: water coating, oil coating and pre-coated coating. There are also many ways to classify. The film coating process can be divided into a coating film process and a precoat film process depending on the raw materials and equipment used. 
1 coating film
That is, the coating film is coated with an adhesive on the film first, and then hot-pressed, which is commonly used in the present country. In the precoating film process, the adhesive is pre-coated on a plastic film, dried and wound, and then hot-pressed on a film-covering apparatus without an adhesive coating apparatus to complete the film coating process. That is, the production of coated film is prone to fire. On a certain day in the summer of 2001, when a color printing plant in the northeast was carrying out compounded plastic production, the plastic film on the laminating machine coating mechanism suddenly caught fire. When the flame of the flame is blown to the drying tunnel by the film laminating machine, it quickly ignites the glue in the glue box under the glue disk, and the thinner, compound glue, BOPP film, ink and paper stored in the workshop, etc. A sea of ​​fire. Although the rescue was timely and caused no major damage to the personnel, the laminating machine and the multicolor printing press had already become a pile of scrap iron, and the direct loss was nearly 8 million yuan. In the past 10 years or so, all manufacturers across the country using the gluing process to produce composites have used paper/plastic composites or plastic/plastic composites. In different seasons, BOPP films have been used to apply adhesives. An instant fire accident. 
2î€Precoated film
The pre-coating process eliminates the need for adhesive heating and drying systems for film-covering equipment, greatly simplifies the coating process, and is easy to operate. It can be used with the start-up, resulting in high flexibility; no solvent odor, no environmental pollution Improve the working conditions; more importantly, it completely avoids the occurrence of film failures such as air bubbles and delamination. The transparency of the film products is extremely high, and it has broad application prospects and promotion value. 
The precoating film structure consists of a substrate and a subbing layer. The substrates are usually PET and BOPP films. Considering the material cost and processing technology, most of the precoated film substrates use BOPP film. The thickness of the film is 12 um to 20 um, and the thickness of the adhesive layer is 5 um to 15 um. According to the different processing equipment and process conditions, use different thickness of the glue layer. The adhesive layer is divided into hot melt adhesive and organic polymer low temperature resin. The difference between the hot melt adhesive and the resin is that the hot melt adhesive is made by blending the main tackifying resin with a tackifier and a regulator, and the organic polymer resin is a single high polymer low temperature copolymer. 
Due to the limitations of process technology, production equipment and raw materials, the pre-coating film produced in domestic equipment still has defects in quality. Most of the pre-coating films produced in China are pre-coated films of hot-melt adhesives due to certain production processes. The process is similar to that of the coating film. The colloid is dissolved in the organic solvent, and the roller is coated on the substrate film with a concave anilox roller. Therefore, the solvent volatilization is insufficient, and the odor is generated during the operation. After the film is coated, The solvent volatilizes, and the surface is prone to blistering; at the same time, due to the blending of hot melt adhesives by several polymer materials, during the use process, poor temperature control will cause degradation and cross-linking of the high-molecular polymer in the hot melt adhesive, so that the film Poor surface; some pre-coated adhesive colloid easily with the outer surface of the substrate, resulting in bad coiling; due to the thin layer, and the surface of the adhesive layer has not been activated, it is easy to produce defects such as insufficient adhesion of the printed matter. Because the hot melt adhesive is made of a mixture of several materials, the transparency after coating is obviously inferior to that of a low temperature pure resin type. 
The application of laminating technology covers a wide range of applications, such as the covers of books and magazines, albums, various documents, advertising brochures, posters, color printing cartons, and other paper products, and often uses a lamination process for surface treatment and processing to achieve better results. Appearance effect. In general, film-covered products have the following features in comparison with general paper-based prints: the surface is smoother and brighter, the gloss is higher, the graphic and text are more vivid and three-dimensional; tear resistance, abrasion resistance and resistance High folding performance; good waterproof, anti-fouling, chemical corrosion resistance. 
3 Water-based coating
The water-based film is an effective method for processing the surface of the printed matter to improve the surface gloss, strength, aesthetic effect, temperature resistance, water resistance, and abrasion resistance of the printed matter and improve the quality of the printed material and the quality of the printed product. Therefore, the quality of the coated film is evaluated. It is also necessary to examine the brightness, strength and adhesion of the coating film. The development of the water laminating machine has made the water-based coating technology widely used. The water-based wet film has high strength with its laminated film prints. High grade, easy recycling, no pollution and other characteristics favored by the majority of customers. 
4 î€ Curved Surface Film 
Surface coating is actually a brand new transfer technology. General traditional printing or transfer is incapable of dealing with complex-shaped workpieces. Surface coating is not only easy but also applicable to different materials, but also greatly enhances the added value of the products due to the vibrant colors and patterns. . This technology is a revolutionary new transfer technology for the 20th century. The surface coating is a special chemical treatment film. After being printed with a certain color texture, the surface is applied to the surface of water. The effect of water pressure is used to evenly transfer the color texture pattern to the surface of the product, and the cover film is automatically applied. After dissolving, after cleaning and drying, a layer of transparent protective coating is applied, and the product has presented a completely different visual effect.
Surface coating application industry: 1 automotive supplies: instrument panel, control panel, tissue box, cup holder, tape rack, post view frame, control handle, lock, etc.; 2 electronic products: telephone, pager, video recorder, television, Air conditioners, speakers, remote controls, mice, watches, etc.; 3 bedroom supplies: sofa, coffee table, kitchen box, chandeliers, ashtrays, vases, utensils, etc.; 4 days with boutique: glasses, glasses box, pen, pen holder, desk calendar Frames, art frames, rackets, items, make-up boxes, etc.; 5 Interior building materials: doors, windows, floors, wallboards, etc. 
The film coating process can be classified into cold (cold pressure) film, heat (heat live) film and liquid film according to the conditions of heat, pressure, and material. The hot film technology refers to the process of heat activation of the pre-coated adhesive on the film, and the process of bonding the film and the printed product together; and the cold film is pressed directly, and the film directly adheres to the adhesive. The prints are glued together. Both methods can produce special films such as UV protection film, waterproof or anti-friction film. Recently, there has also emerged an emerging technology called the "liquid coating" method. The transparent liquid is brushed directly on the surface of the product with a brush, a spray gun, a roller, or a special laminator. This method is simple and costly, but it is not yet mature. 
Third, the film used plastic film
Commonly used plastic films are: polyvinyl chloride (PVC), polypropylene (BOPP) and polyester (PET) films. Among them, BOPP film (15 ~ 20um) is flexible, non-toxic, and has good flatness, high transparency, good lightness, and has the properties of abrasion resistance, water resistance, heat resistance, chemical resistance, etc. In addition, it is cheap and it is covered. The ideal composite material in the membrane process. 
The quality requirements for the plastic film of the film coating process are: The thickness directly affects the transparency, refractive index, film fastness, and mechanical strength of the film, depending on the film's performance and purpose. The thickness of the film is preferably between 0.01 and 0.02 mm. To be treated by corona or other methods, the surface tension of the treated surface should reach 4Pa, as well as good wettability and adhesion performance, and the corona treatment surface should be uniform. The higher the transparency, the better so as to ensure the best clarity of the printed material. 
Transparency is expressed as the percentage of transmitted light, ie, transmitted light and projected light; the transmittance of PET film is generally 88% to 90%, and the transmittance of other kinds of films is usually between 92% and 93%. Good light resistance, that is, it is not easy to discolor under long-term irradiation of light, and has certain mechanical strength and flexibility characteristics. The mechanical strength of the film includes tensile strength, elongation at break, modulus of elasticity, impact strength, and the number of folding times and other technologies. index. The geometric dimensions should be stable, and commonly used indicators such as moisture absorption expansion coefficient, thermal expansion coefficient, heat distortion temperature, and the like. Film coating film should be in contact with solvents, adhesives, inks, etc., must have a certain degree of chemical stability. The appearance of the film surface should be smooth, without unevenness and wrinkles, and the film should be free from bubbles, shrinkage holes, pinholes, and pits, etc. The film surface should be free from contamination such as dust, impurities, and grease. Uniform thickness, small deviation in vertical and horizontal thickness; due to the limited adjustment ability of the laminating machine, it is also required to be rewinder and neat, and the two ends should be loose and uniform to ensure uniform coating. Of course, the cost is low. 
The quality inspection method of plastic film, in addition to the above-mentioned several kinds of surface treatment such as the stock surface, most of them can be handled by hand or visually. The wide-barrel film web must also be slit into narrow webs according to the required width in order to be used for lamination. The narrow web after slitting requires the edges to be flush, the two terminals are aligned, and the curling tension is uniform. 
Film coating, that is, film, is the plastic film coated with adhesive, and paper prints after heating, pressure, and then bonded together to form a paper-plastic products a processing technology. The laminated film prints have a thin and transparent plastic film on the surface. The surface of the film is more smooth and bright, which improves the glossiness and fastness of printed materials. The graphic and text colors are more vivid and full of three-dimensional feeling. , anti-fouling, wear-resistant, folding, chemical corrosion and other effects. 
The most undeniable fact at present is the protective effect of the film. Whether it is wear-proof, waterproof or UV-resistant film, their functions are unmatched by ink and paper. Especially for those works that need to be displayed, I do not know how many times they must be handled, handled, moved or moved. Only the film can effectively prevent scratches, scratches and other mechanical damage. For matte works such as matte, the adhesive in the film can penetrate into the gap of the toner, which can reflect the most subtle colors and improve the color depth of the image. For bright works, it can also reduce the degree of surface reflection of the printed products, and protect the human eye under the premise of obtaining the maximum color depth. Moreover, the film can improve the appearance of the product and stimulate the consumer's desire to purchase. Despite the appearance of waterproof paper and waterproof ink, their price is double that of the film. And the effect is not as laminating. 
Second, the classification of laminated film
According to the coating process is divided into three types: dry coating, wet coating, oil coating. According to the nature of the plastic film is divided into: water coating, oil coating and pre-coated coating. There are also many ways to classify. The film coating process can be divided into a coating film process and a precoat film process depending on the raw materials and equipment used. 
1 coating film
That is, the coating film is coated with an adhesive on the film first, and then hot-pressed, which is commonly used in the present country. In the precoating film process, the adhesive is pre-coated on a plastic film, dried and wound, and then hot-pressed on a film-covering apparatus without an adhesive coating apparatus to complete the film coating process. That is, the production of coated film is prone to fire. On a certain day in the summer of 2001, when a color printing plant in the northeast was carrying out compounded plastic production, the plastic film on the laminating machine coating mechanism suddenly caught fire. When the flame of the flame is blown to the drying tunnel by the film laminating machine, it quickly ignites the glue in the glue box under the glue disk, and the thinner, compound glue, BOPP film, ink and paper stored in the workshop, etc. A sea of ​​fire. Although the rescue was timely and caused no major damage to the personnel, the laminating machine and the multicolor printing press had already become a pile of scrap iron, and the direct loss was nearly 8 million yuan. In the past 10 years or so, all manufacturers across the country using the gluing process to produce composites have used paper/plastic composites or plastic/plastic composites. In different seasons, BOPP films have been used to apply adhesives. An instant fire accident. 
2î€Precoated film
The pre-coating process eliminates the need for adhesive heating and drying systems for film-covering equipment, greatly simplifies the coating process, and is easy to operate. It can be used with the start-up, resulting in high flexibility; no solvent odor, no environmental pollution Improve the working conditions; more importantly, it completely avoids the occurrence of film failures such as air bubbles and delamination. The transparency of the film products is extremely high, and it has broad application prospects and promotion value. 
The precoating film structure consists of a substrate and a subbing layer. The substrates are usually PET and BOPP films. Considering the material cost and processing technology, most of the precoated film substrates use BOPP film. The thickness of the film is 12 um to 20 um, and the thickness of the adhesive layer is 5 um to 15 um. According to the different processing equipment and process conditions, use different thickness of the glue layer. The adhesive layer is divided into hot melt adhesive and organic polymer low temperature resin. The difference between the hot melt adhesive and the resin is that the hot melt adhesive is made by blending the main tackifying resin with a tackifier and a regulator, and the organic polymer resin is a single high polymer low temperature copolymer. 
Due to the limitations of process technology, production equipment and raw materials, the pre-coating film produced in domestic equipment still has defects in quality. Most of the pre-coating films produced in China are pre-coated films of hot-melt adhesives due to certain production processes. The process is similar to that of the coating film. The colloid is dissolved in the organic solvent, and the roller is coated on the substrate film with a concave anilox roller. Therefore, the solvent volatilization is insufficient, and the odor is generated during the operation. After the film is coated, The solvent volatilizes, and the surface is prone to blistering; at the same time, due to the blending of hot melt adhesives by several polymer materials, during the use process, poor temperature control will cause degradation and cross-linking of the high-molecular polymer in the hot melt adhesive, so that the film Poor surface; some pre-coated adhesive colloid easily with the outer surface of the substrate, resulting in bad coiling; due to the thin layer, and the surface of the adhesive layer has not been activated, it is easy to produce defects such as insufficient adhesion of the printed matter. Because the hot melt adhesive is made of a mixture of several materials, the transparency after coating is obviously inferior to that of a low temperature pure resin type. 
The application of laminating technology covers a wide range of applications, such as the covers of books and magazines, albums, various documents, advertising brochures, posters, color printing cartons, and other paper products, and often uses a lamination process for surface treatment and processing to achieve better results. Appearance effect. In general, film-covered products have the following features in comparison with general paper-based prints: the surface is smoother and brighter, the gloss is higher, the graphic and text are more vivid and three-dimensional; tear resistance, abrasion resistance and resistance High folding performance; good waterproof, anti-fouling, chemical corrosion resistance. 
3 Water-based coating
The water-based film is an effective method for processing the surface of the printed matter to improve the surface gloss, strength, aesthetic effect, temperature resistance, water resistance, and abrasion resistance of the printed matter and improve the quality of the printed material and the quality of the printed product. Therefore, the quality of the coated film is evaluated. It is also necessary to examine the brightness, strength and adhesion of the coating film. The development of the water laminating machine has made the water-based coating technology widely used. The water-based wet film has high strength with its laminated film prints. High grade, easy recycling, no pollution and other characteristics favored by the majority of customers. 
4 î€ Curved Surface Film 
Surface coating is actually a brand new transfer technology. General traditional printing or transfer is incapable of dealing with complex-shaped workpieces. Surface coating is not only easy but also applicable to different materials, but also greatly enhances the added value of the products due to the vibrant colors and patterns. . This technology is a revolutionary new transfer technology for the 20th century. The surface coating is a special chemical treatment film. After being printed with a certain color texture, the surface is applied to the surface of water. The effect of water pressure is used to evenly transfer the color texture pattern to the surface of the product, and the cover film is automatically applied. After dissolving, after cleaning and drying, a layer of transparent protective coating is applied, and the product has presented a completely different visual effect.
Surface coating application industry: 1 automotive supplies: instrument panel, control panel, tissue box, cup holder, tape rack, post view frame, control handle, lock, etc.; 2 electronic products: telephone, pager, video recorder, television, Air conditioners, speakers, remote controls, mice, watches, etc.; 3 bedroom supplies: sofa, coffee table, kitchen box, chandeliers, ashtrays, vases, utensils, etc.; 4 days with boutique: glasses, glasses box, pen, pen holder, desk calendar Frames, art frames, rackets, items, make-up boxes, etc.; 5 Interior building materials: doors, windows, floors, wallboards, etc. 
The film coating process can be classified into cold (cold pressure) film, heat (heat live) film and liquid film according to the conditions of heat, pressure, and material. The hot film technology refers to the process of heat activation of the pre-coated adhesive on the film, and the process of bonding the film and the printed product together; and the cold film is pressed directly, and the film directly adheres to the adhesive. The prints are glued together. Both methods can produce special films such as UV protection film, waterproof or anti-friction film. Recently, there has also emerged an emerging technology called the "liquid coating" method. The transparent liquid is brushed directly on the surface of the product with a brush, a spray gun, a roller, or a special laminator. This method is simple and costly, but it is not yet mature. 
Third, the film used plastic film
Commonly used plastic films are: polyvinyl chloride (PVC), polypropylene (BOPP) and polyester (PET) films. Among them, BOPP film (15 ~ 20um) is flexible, non-toxic, and has good flatness, high transparency, good lightness, and has the properties of abrasion resistance, water resistance, heat resistance, chemical resistance, etc. In addition, it is cheap and it is covered. The ideal composite material in the membrane process. 
The quality requirements for the plastic film of the film coating process are: The thickness directly affects the transparency, refractive index, film fastness, and mechanical strength of the film, depending on the film's performance and purpose. The thickness of the film is preferably between 0.01 and 0.02 mm. To be treated by corona or other methods, the surface tension of the treated surface should reach 4Pa, as well as good wettability and adhesion performance, and the corona treatment surface should be uniform. The higher the transparency, the better so as to ensure the best clarity of the printed material. 
Transparency is expressed as the percentage of transmitted light, ie, transmitted light and projected light; the transmittance of PET film is generally 88% to 90%, and the transmittance of other kinds of films is usually between 92% and 93%. Good light resistance, that is, it is not easy to discolor under long-term irradiation of light, and has certain mechanical strength and flexibility characteristics. The mechanical strength of the film includes tensile strength, elongation at break, modulus of elasticity, impact strength, and the number of folding times and other technologies. index. The geometric dimensions should be stable, and commonly used indicators such as moisture absorption expansion coefficient, thermal expansion coefficient, heat distortion temperature, and the like. Film coating film should be in contact with solvents, adhesives, inks, etc., must have a certain degree of chemical stability. The appearance of the film surface should be smooth, without unevenness and wrinkles, and the film should be free from bubbles, shrinkage holes, pinholes, and pits, etc. The film surface should be free from contamination such as dust, impurities, and grease. Uniform thickness, small deviation in vertical and horizontal thickness; due to the limited adjustment ability of the laminating machine, it is also required to be rewinder and neat, and the two ends should be loose and uniform to ensure uniform coating. Of course, the cost is low. 
The quality inspection method of plastic film, in addition to the above-mentioned several kinds of surface treatment such as the stock surface, most of them can be handled by hand or visually. The wide-barrel film web must also be slit into narrow webs according to the required width in order to be used for lamination. The narrow web after slitting requires the edges to be flush, the two terminals are aligned, and the curling tension is uniform. 
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